Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
We are installing a "PTO wet kit" on our truck.
The kit, that I bought at a truck parts store, consists of a Muncie PTO, 13 GPM gear pump, and a pressure relief valve with a cartridge similar to Sun RPGC-LAN. I say "similar to" because the actual model is a fixed pressure RPGC-L2500N, but it is hard to find anything in google about that model number. RPGC-LAN is a number that is easier to find. I had a tank that I put to use. Anyway, we did a first test of the system, with the output and return hoses connected directly to each other. No problem. Then we left the hoses disconnected, so that there was no circuit, and proceeded to run the pump to test the relief valve at full pressure and to warm up the oil quicker. At first everything was great, pressure held at 2500 PSI, everything was flowing. After a while, though, something happened and pressure dropped to 500 psi, then more. I started looking. The pump pumps with good flow, I know this because I pumped some oil into a bucket. Took out the pressure relief cartridge. I found out, to my surprise, that it is very easy to puch the piston in with a plastic pen. If it is a 2500 PSI valve, it should have taken a force of several hundred pounds. Instead I can easily do it by hand. The picture is he http://www.sunhydraulics.com/model/RPGC I do not really understand what could have happened and why this valve could fail and become so easy to open. Would anyone have any idea? What could it be? Thanks i i |
#2
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
I do not really understand what could have happened and why this valve could fail and become so easy to open. Would anyone have any idea? What could it be? The spring inside it broke i |
#3
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
On 2015-03-06, Karl Townsend wrote:
I do not really understand what could have happened and why this valve could fail and become so easy to open. Would anyone have any idea? What could it be? The spring inside it broke i That is what I think too -- but I wonder, how could that happen? i |
#4
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
"Ignoramus21464" wrote in
message ... On 2015-03-06, Karl Townsend wrote: I do not really understand what could have happened and why this valve could fail and become so easy to open. Would anyone have any idea? What could it be? The spring inside it broke i That is what I think too -- but I wonder, how could that happen? i My Husqvarna chain saw eats expensive made-in-Germany clutch and recoil starter springs. -jsw |
#5
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
On Thu, 05 Mar 2015 20:50:12 -0600, Ignoramus21464
wrote: On 2015-03-06, Karl Townsend wrote: I do not really understand what could have happened and why this valve could fail and become so easy to open. Would anyone have any idea? What could it be? The spring inside it broke i That is what I think too -- but I wonder, how could that happen? Material or procedural defect in the manufacture of the spring. -- Stain and poly are their own punishment. |
#6
Posted to rec.crafts.metalworking
|
|||
|
|||
Hydraulic pressure relief valve stopped holding
Karl Townsend fired this volley in
: The spring inside it broke That's the most likely scenario. How many decades has it been running at near top pressure in a "full-singing chatter mode?" G When they squawk (and of course they inevitably do), they're wearing out ball, seat, and spring. Lloyd |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Pressure relief valve | Home Repair | |||
pressure relief valve | UK diy | |||
Pressure relief valve | Home Repair | |||
Pressure relief valve | Home Repair | |||
Fault in combi boiler's pressure guage, and/or pressure-relief valve? | UK diy |