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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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20 yr old Air compresor - leaking at unloader valve
My Sears 5 hp ( ok: 2 hp) belt drive compressor has been leaking at
the unloader valve whenever the unit is shut of or it turns itself off (for longer than I care to admit). I have been limping along with this problem by manually regulating the pressure via the breaker or using enought air to keep the unit running for extended periods. I finaly replaced the unloader valve last night. New one leaks just as much - after a moment of thought - duh, that is what the unloader valve is supposed to do. Problem is that the unloader valve is unloading the tank along with any residual pressure in the pump. Question is: where is the air leak coming from? The reed valves in the head (I presume there are reed valves, have not opened up a compressor in 30 years) or a check valve between the pump and the tank? Any been there fixed that? Thought I would ask before digging deeper into the compressor. THanks |
#2
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20 yr old Air compresor - leaking at unloader valve
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#4
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20 yr old Air compresor - leaking at unloader valve
Mine of the same vintage has a check valve in the tank where the pipe from the compressor attaches, looks like a pipe fitting but is the check valve. When it went I cut the pipe & installed a compression fitting type inline. Same experience here on a 50 year old IR T-30, including the same symptoms the OP describes. Grainger has replacement checks, though in my case the OEM check was much easier to install, and worth the extra cost in avoided time and aggravation. BTW, any old check valve is not going to be a suitable replacement. -- Ned Simmons- Hide quoted text - - Show quoted text - THanks for the replys. "BTW, any old check valve is not going to be a suitable replacement" - are you referring to the flow rate of the check valve or is there something else I need to pay attention to. After reading the responses, I was planning on buying one from McMaster (note: I have not yet looked to see if they have one w/ a suitable flow rate). |
#5
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20 yr old Air compresor - leaking at unloader valve
On Jun 17, 10:34*am, wrote:
Mine of the same vintage has a check valve in the tank where the pipe from the compressor attaches, looks like a pipe fitting but is the check valve. When it went I cut the pipe & installed a compression fitting type inline. Same experience here on a 50 year old IR T-30, including the same symptoms the OP describes. Grainger has replacement checks, though in my case the OEM check was much easier to install, and worth the extra cost in avoided time and aggravation. BTW, any old check valve is not going to be a suitable replacement. -- Ned Simmons- Hide quoted text - - Show quoted text - THanks for the replys. *"BTW, any old check valve is not going to be a suitable replacement" *- are you referring to the flow rate of the check valve or is there something else I need to pay attention to. After reading the responses, I was planning on buying one from McMaster (note: I have not yet looked to see if they have one w/ a suitable flow rate).- Hide quoted text - - Show quoted text - See the ones on this page: http://www.surpluscenter.com/pages/Catalog284-096.pdf Usually have a bleed-off fitting on the compressor side to run to the pressure switch for unloading. One could be cobbled up from a regular check valve and some fittings, but not every installation has room for that. Stan |
#6
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20 yr old Air compresor - leaking at unloader valve
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#7
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20 yr old Air compresor - leaking at unloader valve
On Fri, 17 Jun 2011 14:16:06 -0400, BQ340 wrote:
On 6/17/2011 12:34 PM, wrote: Mine of the same vintage has a check valve in the tank where the pipe from the compressor attaches, looks like a pipe fitting but is the check valve. When it went I cut the pipe& installed a compression fitting type inline. Same experience here on a 50 year old IR T-30, including the same symptoms the OP describes. Grainger has replacement checks, though in my case the OEM check was much easier to install, and worth the extra cost in avoided time and aggravation. BTW, any old check valve is not going to be a suitable replacement. -- Ned Simmons- Hide quoted text - - Show quoted text - THanks for the replys. "BTW, any old check valve is not going to be a suitable replacement" - are you referring to the flow rate of the check valve or is there something else I need to pay attention to. After reading the responses, I was planning on buying one from McMaster (note: I have not yet looked to see if they have one w/ a suitable flow rate). Flow & heat tolerance. Try to put it as far from the compressor head as you can, that pipe & valve get HOT. I got mine from Graingers. MikeB Mine is a simple brass foot valve from the plumbing department. 1" Npt |
#8
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20 yr old Air compresor - leaking at unloader valve
On Fri, 17 Jun 2011 14:16:06 -0400, BQ340 wrote:
On 6/17/2011 12:34 PM, wrote: Mine of the same vintage has a check valve in the tank where the pipe from the compressor attaches, looks like a pipe fitting but is the check valve. When it went I cut the pipe& installed a compression fitting type inline. Same experience here on a 50 year old IR T-30, including the same symptoms the OP describes. Grainger has replacement checks, though in my case the OEM check was much easier to install, and worth the extra cost in avoided time and aggravation. BTW, any old check valve is not going to be a suitable replacement. -- Ned Simmons- Hide quoted text - - Show quoted text - THanks for the replys. "BTW, any old check valve is not going to be a suitable replacement" - are you referring to the flow rate of the check valve or is there something else I need to pay attention to. After reading the responses, I was planning on buying one from McMaster (note: I have not yet looked to see if they have one w/ a suitable flow rate). Flow & heat tolerance. Try to put it as far from the compressor head as you can, that pipe & valve get HOT. I got mine from Graingers. MikeB See the bottom of Grainger p.3675 for a variety of sizes and styles. As Mike said, note the relatively high temperature rating of these checks. http://www.grainger.com/Grainger/wwg...Catalog= main -- Ned Simmons |
#9
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20 yr old Air compresor - leaking at unloader valve
One last kiss.
A round from a .44 Mag. Walk away ............................ |
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