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#1
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water pressure reducing valve and water pressure regulator
On my water pipe system, there is this bell shape thing with a bolt on
the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? |
#2
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water pressure reducing valve and water pressure regulator
On 11/12/2017 07:40 AM, Oumati Asami wrote:
On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? http://www.watts.com/pages/learnAbou...cingValves.asp |
#3
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water pressure reducing valve and water pressure regulator
On 11/12/17 7:40 AM, Oumati Asami wrote:
On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv |
#4
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water pressure reducing valve and water pressure regulator
On Sunday, November 12, 2017 at 7:40:17 AM UTC-5, Oumati Asami wrote:
On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, I've never seen a "pressure reducer", only pressure regulators. Also, the concept of a pressure reducer is pretty stupid. You want a regulator that is capable of taking an unregulated incoming pressure and then maintaining the set constant pressure on the other side, as long as the desired set pressure is at the incoming pressure or lower. I suspect that's what you have and your thinking on this is correct. |
#5
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water pressure reducing valve and water pressure regulator
replying to Oumati Asami, Iggy wrote:
The Engineer's right in his description , but wrong with your device. Plain and simple, if you have a Bell or Cone on top you have a Regulator or Limiting Valve. Under the Bell or Cone is a Spring that fixes your flow-rate, opening or closing automatically in response to water pressure fluctuations. This and yours delivers a fairly constant outlet pressure. While the word Reducer is correct for yours, because it's actually doing that and the name is even interchangeable by some people. However, the proper usage of the word Reducer usually applies to devices that don't have a spring and are just designed with a static fixed flow-rate or low-flow. These rely on supply pressures being mostly constant, therefore they do fluctuate whenever the supply does. -- for full context, visit https://www.homeownershub.com/mainte...r-1150841-.htm |
#6
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water pressure reducing valve and water pressure regulator
On Sunday, November 12, 2017 at 2:44:06 PM UTC-5, Iggy wrote:
replying to Oumati Asami, Iggy wrote: The Engineer's right in his description , but wrong with your device. No, he's not right in his description. What the poster said was that the "engineer" said that it works by maintaining a constant, fixed, reduction amount in output pressure versus input pressure. No matter if you call it a regulator or a pressure reducing valve, I've never seen one work that way. They all work by maintaining a constant, set output pressure that's adjustable. A reducer that just takes a fixed X PSI off the incoming pressure and then varies the output up and down as the unregulated side varies would be pretty worthless. He can verify what he has, just get the make and go to the manufacturer's website. |
#7
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water pressure reducing valve and water pressure regulator
On 12-Nov-17 8:34 PM, Retired wrote:
On 11/12/17 7:40 AM, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. |
#8
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water pressure reducing valve and water pressure regulator
On 11/13/2017 11:25 AM, Oumati Asami wrote:
On 12-Nov-17 8:34 PM, Retired wrote: On 11/12/17 7:40 AM, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. Define constant. Given the entering pressure may vary it can affect the leaving predsure a bit. If you take constant as being perfect all the time then no. If you take constant as being withing a normal tolerance of a few psi in either direction, then yes. Functional pressure means the variation is minimal and your toilet flush or dishwasher will still work. A drop from 50 psi to 42 psi is functional but a drop from 50 to 5 psi is not. |
#9
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water pressure reducing valve and water pressure regulator
On 12-Nov-17 9:18 PM, trader_4 wrote:
On Sunday, November 12, 2017 at 7:40:17 AM UTC-5, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, I've never seen a "pressure reducer", only pressure regulators. Also, the concept of a pressure reducer is pretty stupid. You want a regulator that is capable of taking an unregulated incoming pressure and then maintaining the set constant pressure on the other side, as long as the desired set pressure is at the incoming pressure or lower. I suspect that's what you have and your thinking on this is correct. There is a bolt, much bigger than the bolt on the top, on the bottom of the device. I unscrewed and removed it. A spring, around 2" long and maybe 1/2" in diameter, fell off the device. Is that normal? I thought there was a diaphragm or something underneath the spring that would prevent the spring from falling off. |
#10
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water pressure reducing valve and water pressure regulator
On 13-Nov-17 8:51 PM, trader_4 wrote:
On Sunday, November 12, 2017 at 2:44:06 PM UTC-5, Iggy wrote: replying to Oumati Asami, Iggy wrote: The Engineer's right in his description , but wrong with your device. No, he's not right in his description. What the poster said was that the "engineer" said that it works by maintaining a constant, fixed, reduction amount in output pressure versus input pressure. No matter if you call it a regulator or a pressure reducing valve, I've never seen one work that way. They all work by maintaining a constant, set output pressure that's adjustable. A reducer that just takes a fixed X PSI off the incoming pressure and then varies the output up and down as the unregulated side varies would be pretty worthless. He can verify what he has, just get the make and go to the manufacturer's website. I found the make but still need to find out the model number. I'm not sure the engineer meant a reducer would reduce the water pressure by a fixed amount. The output pressure would increase when the input pressure increases but not by the same amount. Let's say the input pressure is 80 psi and output pressure is set to 50 psi. When the input pressure is increased to 100 psi (an increase of 20 psi), the output pressure would be higher than 50 psi but probably not 70 psi. |
#11
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water pressure reducing valve and water pressure regulator
On 13-Nov-17 11:02 PM, Ed Pawlowski wrote:
On 11/13/2017 11:25 AM, Oumati Asami wrote: On 12-Nov-17 8:34 PM, Retired wrote: On 11/12/17 7:40 AM, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. Define constant.Â* Given the entering pressure may vary it can affect the leaving predsure a bit.Â* If you take constant as being perfect all the time thenÂ* no.Â* If you take constant as being withing a normal tolerance of a few psi in either direction, then yes.Â* Functional pressure means the variation is minimal and your toilet flush or dishwasher will still work.Â* A drop from 50 psi to 42 psi is functional but a drop from 50 to 5 psi is not. From 50 to 42 is a drop of 16%. That seems quite large to me. An 8% drop is acceptable to me but maybe I'm an idealist. |
#12
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 11:25:46 AM UTC-5, Oumati Asami wrote:
On 12-Nov-17 8:34 PM, Retired wrote: On 11/12/17 7:40 AM, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. It means it maintains the output pressure near what it's set to regardless of whether the input pressure is at that pressure or much higher. The whole purpose is to maintain near constant pressure. Again, I believe your question was whether they work like: A - Maintains a fixed reduction value, eg 20 psi below whatever the incoming pressure is. (This is what you say the guy told you) So if the incoming is 100 and it maintains a 40 drop, you'd have 60 on the house side, but then if the incoming drops to 70, you'd have 30 PSI out. B - Maintains a fixed output value, eg 60SI, regardless of incoming pressure, as long as the incoming is 60+ They work like B, they will keep it close to 60. The A type I've never seen and if they exist sound pretty worthless when you have the B type available. |
#13
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water pressure reducing valve and water pressure regulator
On 11/13/2017 11:50 AM, Oumati Asami wrote:
A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. Define constant.Â* Given the entering pressure may vary it can affect the leaving predsure a bit.Â* If you take constant as being perfect all the time thenÂ* no.Â* If you take constant as being withing a normal tolerance of a few psi in either direction, then yes.Â* Functional pressure means the variation is minimal and your toilet flush or dishwasher will still work.Â* A drop from 50 psi to 42 psi is functional but a drop from 50 to 5 psi is not. From 50 to 42 is a drop of 16%. That seems quite large to me. An 8% drop is acceptable to me but maybe I'm an idealist. What are you basing your conclusion on? Is it because 8% sounds better than 16%? I'm basing it on operating a manufacturing plant with air, steam, city water, recirculated water. We probably had 30 or 40 pressure regulators. I often witnessed drops of 25% with no ill effects. It was a part of normal operations. Machines and appliances can take a wide variation unless you are doing some scientific experiments. |
#14
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water pressure reducing valve and water pressure regulator
On Sun, 12 Nov 2017 19:10:07 +0630, Oumati Asami wrote:
On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? A pressure reducer and a pressure regulator are just different names for the same thing. In a Navy fire room we called them reducers. All were constant output pressure when operating. That "engineer" made no sense. |
#15
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 11:46:19 AM UTC-5, Oumati Asami wrote:
On 13-Nov-17 8:51 PM, trader_4 wrote: On Sunday, November 12, 2017 at 2:44:06 PM UTC-5, Iggy wrote: replying to Oumati Asami, Iggy wrote: The Engineer's right in his description , but wrong with your device. No, he's not right in his description. What the poster said was that the "engineer" said that it works by maintaining a constant, fixed, reduction amount in output pressure versus input pressure. No matter if you call it a regulator or a pressure reducing valve, I've never seen one work that way. They all work by maintaining a constant, set output pressure that's adjustable. A reducer that just takes a fixed X PSI off the incoming pressure and then varies the output up and down as the unregulated side varies would be pretty worthless. He can verify what he has, just get the make and go to the manufacturer's website. I found the make but still need to find out the model number. I'm not sure the engineer meant a reducer would reduce the water pressure by a fixed amount. The output pressure would increase when the input pressure increases but not by the same amount. Let's say the input pressure is 80 psi and output pressure is set to 50 psi. When the input pressure is increased to 100 psi (an increase of 20 psi), the output pressure would be higher than 50 psi but probably not 70 psi. There should be no significant variation. It's a pressure controlled valve, as the output pressure approaches the set value, it closes. You might see a pound or two variation, but it should still be very close to 50 and not matter from a practical standpoint. |
#16
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 11:33:41 AM UTC-5, Oumati Asami wrote:
On 12-Nov-17 9:18 PM, trader_4 wrote: On Sunday, November 12, 2017 at 7:40:17 AM UTC-5, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, I've never seen a "pressure reducer", only pressure regulators. Also, the concept of a pressure reducer is pretty stupid. You want a regulator that is capable of taking an unregulated incoming pressure and then maintaining the set constant pressure on the other side, as long as the desired set pressure is at the incoming pressure or lower. I suspect that's what you have and your thinking on this is correct. There is a bolt, much bigger than the bolt on the top, on the bottom of the device. I unscrewed and removed it. A spring, around 2" long and maybe 1/2" in diameter, fell off the device. Is that normal? I thought there was a diaphragm or something underneath the spring that would prevent the spring from falling off. We don't know which particular device you have or how it's put together. What's the problem and what are you trying to do? Taking a bolt with a spring out and having the spring come with it doesn't sound unusual to me. |
#17
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water pressure reducing valve and water pressure regulator
No, I've never seen a "pressure reducer", only pressure regulators. The types of regulators we are talking about all work by REDUCING the pressure. If the regulator is set to 50 and the incoming pressure is 25, the "regulator cannot increase the pressure, it can regulate in one direction only and that is reducing. That's probably what the engineer was trying to say. mark |
#18
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water pressure reducing valve and water pressure regulator
I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. .... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. |
#19
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water pressure reducing valve and water pressure regulator
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#20
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water pressure reducing valve and water pressure regulator
On 13-Nov-17 11:33 PM, Ed Pawlowski wrote:
On 11/13/2017 11:50 AM, Oumati Asami wrote: A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. Define constant.Â* Given the entering pressure may vary it can affect the leaving predsure a bit.Â* If you take constant as being perfect all the time thenÂ* no.Â* If you take constant as being withing a normal tolerance of a few psi in either direction, then yes. Functional pressure means the variation is minimal and your toilet flush or dishwasher will still work.Â* A drop from 50 psi to 42 psi is functional but a drop from 50 to 5 psi is not. Â*From 50 to 42 is a drop of 16%. That seems quite large to me. An 8% drop is acceptable to me but maybe I'm an idealist. What are you basing your conclusion on?Â* Is it because 8% sounds better than 16%?Â* I'm basing it on operating a manufacturing plant with air, steam, city water, recirculated water.Â* We probably had 30 or 40 pressure regulators.Â* I often witnessed drops of 25% with no ill effects.Â* It was a part of normal operations.Â* Machines and appliances can take a wide variation unless you are doing some scientific experiments. If a valve downstream is open, the pressure would drop. When I was with the engineer, I did open a valve and the pressure dropped from 60 to 42 psi. But this is a totally different thing. It's not my concern. My concern is: if the input pressure increases, would the output pressure also increase given that the device is set to a certain pressure below the input pressure? |
#22
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 12:45:20 PM UTC-5, BurfordTJustice wrote:
Dance little man dance... "trader_4" wrote in message ... :: : No, I've never seen a "pressure reducer",. Fool, look at what I said in context. The OP was questioning whether he had a device that: a- does a reduction in X psi off the incoming pressure and maintains an x reduction as the input varies. So if you had it set to 20 reduction you'd get 80 with 100 incoming, 40 with 60 incoming b - maintains the desired output pressure, eg 60 PSI, as long as the incoming is at 60 or higher. I've never seen the "a" device. He has the B device, everyone here agrees with that and how it works. So, once again, what's your point and your contribution to AHR? *nothing* Now go back to posting your alt right crap for your Russian masters. |
#23
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water pressure reducing valve and water pressure regulator
On 11/13/2017 9:55 AM, Oumati Asami wrote:
On 13-Nov-17 11:33 PM, Ed Pawlowski wrote: On 11/13/2017 11:50 AM, Oumati Asami wrote: A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? No, according to this maker's article, he has it backwards. "Even if the supply water pressure fluctuates, the *pressure reducing valve* ensures a constant flow of water at a functional pressure, as long as the supply pressure does not drop below the valve's pre-set pressure." http://www.watts.com/pages/learnAbou...=64#whatiswprv I read the article. The article says "ensures a constant flow of water at a functional pressure". I don't know what a "FUNCTIONAL PRESSURE" means. Is it "constant pressure" or not? That's what I want to know. Define constant.Â* Given the entering pressure may vary it can affect the leaving predsure a bit.Â* If you take constant as being perfect all the time thenÂ* no.Â* If you take constant as being withing a normal tolerance of a few psi in either direction, then yes. Functional pressure means the variation is minimal and your toilet flush or dishwasher will still work.Â* A drop from 50 psi to 42 psi is functional but a drop from 50 to 5 psi is not. Â*From 50 to 42 is a drop of 16%. That seems quite large to me. An 8% drop is acceptable to me but maybe I'm an idealist. What are you basing your conclusion on?Â* Is it because 8% sounds better than 16%?Â* I'm basing it on operating a manufacturing plant with air, steam, city water, recirculated water.Â* We probably had 30 or 40 pressure regulators.Â* I often witnessed drops of 25% with no ill effects.Â* It was a part of normal operations.Â* Machines and appliances can take a wide variation unless you are doing some scientific experiments. If a valve downstream is open, the pressure would drop. When I was with the engineer, I did open a valve and the pressure dropped from 60 to 42 psi. But this is a totally different thing. It's not my concern. My concern is: if the input pressure increases, would the output pressure also increase given that the device is set to a certain pressure below the input pressure? It sounds to me like your pressure regulator is defective as it is not maintaining a regulated static pressure. |
#24
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water pressure reducing valve and water pressure regulator
On 11/13/2017 9:05 AM, Vic Smith wrote:
On Sun, 12 Nov 2017 19:10:07 +0630, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? A pressure reducer and a pressure regulator are just different names for the same thing. In a Navy fire room we called them reducers. All were constant output pressure when operating. That "engineer" made no sense. I was wondering when somebody would finally put this "engineer" in quotes. |
#25
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water pressure reducing valve and water pressure regulator
On Tue, 14 Nov 2017 00:52:49 +0630, Oumati Asami wrote:
On 14-Nov-17 12:17 AM, wrote: I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. ... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. Thanks for the link. I'm not sure how to read the flow rates chart. The legend says it's based on a 50 psi differential. When the flow rate is zero, the fall off is zero. So, there is no fall off. In this case, what's the pressure of the system? Is it 50 psi lower than the input pressure (thus, the 50 psi differential)? By the way, what I'm interested in is the output pressure when no valve is open. I just recall I have never mentioned this before. Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A regulator can regulate water pressure only when at least one valve is open. In such a case, the regulator limits how much water flows out, thus, regulating the water pressure. If no valve is open the pressure on both ends of the regulator must be equal. Am I right? You're wrong. |
#26
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 1:22:55 PM UTC-5, Oumati Asami wrote:
On 14-Nov-17 12:17 AM, wrote: I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. ... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. Thanks for the link. I'm not sure how to read the flow rates chart. The legend says it's based on a 50 psi differential. When the flow rate is zero, the fall off is zero. So, there is no fall off. In this case, what's the pressure of the system? Is it 50 psi lower than the input pressure (thus, the 50 psi differential)? With no flow the output side is at whatever pressure you've dialed in. The input side is at whatever the supply pressure is, that is at the dialed in pressure or above. Eg supply side is 100, output is 60. Those flow charts show the pressure drop across the valve, when it's wide open, trying to maintain pressure on the house side. For example, with a 1" valve, at 50 GPM, there would be a 12 PSI drop. So, if you had the valve set to 60 PSI, with 100 PSI incoming, it would be maintaining ~ 60 PSI house side. But if the incoming was 65PSI, you'd have a 12 PSI drop and only ~53PSI on the other side when it was delivering 50 GPM. By the way, what I'm interested in is the output pressure when no valve is open. I just recall I have never mentioned this before. The output pressure should be whatever you've set the valve to. That is unless you have a water heater that fires up and increases the pressure or something like that. Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A regulator can regulate water pressure only when at least one valve is open. In such a case, the regulator limits how much water flows out, thus, regulating the water pressure. If no valve is open the pressure on both ends of the regulator must be equal. Am I right? No. The regulator is a valve that closes in response to the house side pressure. If you stop drawing water, it slowly closes so that only enough water enters to raise the house side to the desired/set pressure. That's the whole point, to avoid having high pressure, eg 120 PSI on the house side when the supply side is at 120PSI. You set it to 60, you get 60. |
#27
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 1:34:42 PM UTC-5, Taxed and Spent wrote:
On 11/13/2017 9:05 AM, Vic Smith wrote: On Sun, 12 Nov 2017 19:10:07 +0630, Oumati Asami wrote: On my water pipe system, there is this bell shape thing with a bolt on the top. I always thought it a water pressure regulator. The other day, the engineer of my community came to check my water system. He said that thing is not a water pressure regulator but a water pressure reducer. According to him, a water pressure regulator is a device that would keep output water pressure constant. If the outgoing water pressure is set to, say, 50, no matter what the main pressure is, be it 100, 90, 80, or 70 psi, the output is always 50 psi. A water pressure reducer, according to him, is a device whose output pressure is affected by the input pressure. If the main pressure is, say, 80 psi, and the output pressure is set to 50 psi, when the main pressure is increased to 100 psi, the output pressure would also increase. Does he make sense? A pressure reducer and a pressure regulator are just different names for the same thing. In a Navy fire room we called them reducers. All were constant output pressure when operating. That "engineer" made no sense. I was wondering when somebody would finally put this "engineer" in quotes. I claim the credit for being the first one to do that. |
#28
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water pressure reducing valve and water pressure regulator
I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. ... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. Thanks for the link. Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A couple more web links, found through a very quick google search. http://www.watts.com/pages/learnAbou...s.asp?catId=64 http://apps.watersurplus.com/techlib...spec_D1101.pdf John T. |
#29
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water pressure reducing valve and water pressure regulator
On 13-Nov-17 11:48 AM, Oumati Asami wrote:
.... No. That's not what he tried to say. I told him the output pressure should be constant. He said no. He said the output pressure would be affected by the input pressure. To some degree, yes, but for residential regulators of the type the outlet pressure is much more strongly controlled by the internal flow pressure drop with flow rate; the pressure drop goes up pretty drastically with increase flow so the downstream pressure drops. The point of the regulator isn't so much (actually at all) to keep a constant downstream pressure as to reduce the maximum pressure to that which will not be damaging to toilet valves, etc., etc., etc., if used the distribution pressure that can be quite a bit higher... He also said the lowest pressure the devise could set to was about 48 psi. I really doubted it. That seems to be quite high for residential water pressure (not that the pressure is quite high but the lower limit is quite high). I would think the device could reduce the pressure to 20 psi or lower. But then, I really need to find out the model number and check the literature. No, they can be set lower; just how far depends on the spring constant and design; typically a 50 psi nominal will be able to go to 20 or 30 psi. A typical data sheet for such a device can be found at http://www.steamshop.com/ConbracoPDF/36Cseries.pdf Note on the second page the pressure drop with flow for the typical 50 psi setpoint... -- |
#30
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water pressure reducing valve and water pressure regulator
replying to trader_4, Iggy wrote:
So, you think the spring (not a rod) is there to do nothing? -- for full context, visit https://www.homeownershub.com/mainte...r-1150841-.htm |
#31
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water pressure reducing valve and water pressure regulator
On 14-Nov-17 1:13 AM, trader_4 wrote:
On Monday, November 13, 2017 at 1:22:55 PM UTC-5, Oumati Asami wrote: On 14-Nov-17 12:17 AM, wrote: I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. ... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. Thanks for the link. I'm not sure how to read the flow rates chart. The legend says it's based on a 50 psi differential. When the flow rate is zero, the fall off is zero. So, there is no fall off. In this case, what's the pressure of the system? Is it 50 psi lower than the input pressure (thus, the 50 psi differential)? With no flow the output side is at whatever pressure you've dialed in. The input side is at whatever the supply pressure is, that is at the dialed in pressure or above. Eg supply side is 100, output is 60. Those flow charts show the pressure drop across the valve, when it's wide open, trying to maintain pressure on the house side. For example, with a 1" valve, at 50 GPM, there would be a 12 PSI drop. So, if you had the valve set to 60 PSI, with 100 PSI incoming, it would be maintaining ~ 60 PSI house side. But if the incoming was 65PSI, you'd have a 12 PSI drop and only ~53PSI on the other side when it was delivering 50 GPM. By the way, what I'm interested in is the output pressure when no valve is open. I just recall I have never mentioned this before. The output pressure should be whatever you've set the valve to. That is unless you have a water heater that fires up and increases the pressure or something like that. Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A regulator can regulate water pressure only when at least one valve is open. In such a case, the regulator limits how much water flows out, thus, regulating the water pressure. If no valve is open the pressure on both ends of the regulator must be equal. Am I right? No. The regulator is a valve that closes in response to the house side pressure. If you stop drawing water, it slowly closes so that only enough water enters to raise the house side to the desired/set pressure. That's the whole point, to avoid having high pressure, eg 120 PSI on the house side when the supply side is at 120PSI. You set it to 60, you get 60. Good. That's the result I want to see. |
#32
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water pressure reducing valve and water pressure regulator
On 14-Nov-17 1:13 AM, trader_4 wrote:
On Monday, November 13, 2017 at 1:22:55 PM UTC-5, Oumati Asami wrote: On 14-Nov-17 12:17 AM, wrote: I found the make but still need to find out the model number. Home Depot's web site has a lot of them - after you click on the product - there is a link to "specifications" that might help. ... graphs for flow characteristics; pressure ranges and limits, etc Here's just one example .. https://www.homedepot.com/catalog/pd...76134d9f7f.pdf John T. Thanks for the link. I'm not sure how to read the flow rates chart. The legend says it's based on a 50 psi differential. When the flow rate is zero, the fall off is zero. So, there is no fall off. In this case, what's the pressure of the system? Is it 50 psi lower than the input pressure (thus, the 50 psi differential)? With no flow the output side is at whatever pressure you've dialed in. The input side is at whatever the supply pressure is, that is at the dialed in pressure or above. Eg supply side is 100, output is 60. Those flow charts show the pressure drop across the valve, when it's wide open, trying to maintain pressure on the house side. For example, with a 1" valve, at 50 GPM, there would be a 12 PSI drop. So, if you had the valve set to 60 PSI, with 100 PSI incoming, it would be maintaining ~ 60 PSI house side. But if the incoming was 65PSI, you'd have a 12 PSI drop and only ~53PSI on the other side when it was delivering 50 GPM. By the way, what I'm interested in is the output pressure when no valve is open. I just recall I have never mentioned this before. The output pressure should be whatever you've set the valve to. That is unless you have a water heater that fires up and increases the pressure or something like that. Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A regulator can regulate water pressure only when at least one valve is open. In such a case, the regulator limits how much water flows out, thus, regulating the water pressure. If no valve is open the pressure on both ends of the regulator must be equal. Am I right? No. The regulator is a valve that closes in response to the house side pressure. If you stop drawing water, it slowly closes so that only enough water enters to raise the house side to the desired/set pressure. That's the whole point, to avoid having high pressure, eg 120 PSI on the house side when the supply side is at 120PSI. You set it to 60, you get 60. Thanks for taking time to explain it. |
#33
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water pressure reducing valve and water pressure regulator
On Monday, November 13, 2017 at 4:14:06 PM UTC-5, Iggy wrote:
replying to trader_4, Iggy wrote: So, you think the spring (not a rod) is there to do nothing? -- I never said or implied anything like that. And again, if you had the courtesy to quote WTF you're replying to, people could easily see that. |
#34
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water pressure reducing valve and water pressure regulator
On 11/13/2017 04:14 PM, Iggy wrote: replying to trader_4, Iggy wrote: So, you think the spring (not a rod) is there to do nothing? A spring-rod is a device that blends air and water in the proper ratio so replace the spring-rod limit control SCR relay. A multi-rod spring systems moving water covers all your options.Â* --Â* for full context, visit https://www.homeownershub.com/mainte...r-1150841-.htm |
#35
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water pressure reducing valve and water pressure regulator
Now that I'm thinking about this, I wonder how a pressure regulator can regulate water pressure when no valve is open. A regulator can regulate water pressure only when at least one valve is open. In such a case, the regulator limits how much water flows out, thus, regulating the water pressure. If no valve is open the pressure on both ends of the regulator must be equal. Am I right? Partially right. the first sign of an internally leaking regulator is that it can no longer regulate the pressure when there is no flow. when there is no flow if there is even a tiny leak in the regulator the output pressure will eventually rise to equal the input pressure. yes the valve inside the regulator has to seal perfectly closed to hold the pressure when there is no flow. mark |
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