Perfomance Testing on a 19000 PRV
Perfomance Testing on a 19000 PRV
(OP)
Hi All,
We are currently performing testing for set pressure indication on an assembled 19126M pressure relief valve and failed to set at the desired set pressure having inconsistent readings each lift. Apart from inconsistent readings, the valve itself did not passed the acceptable test for set pressure indication according to consolidated procedure as stated below but instead had a gush at each test.The said valve was removed and another valve identical to the one in question, same size, model, orifice and set pressure was tested in the same manner and passed set pressure indication with a steady stream at ninety degrees from the valve outlet, no gush and noise.
Consolidated procedure
First continuous flow is the point that the discharge first comes down straight out of the nipple on a 19000 valve or out of the flange on a 1900 valve.
In any case the liquid valve set pressure should occur when the discharge first stops curling(COHESION) under the nipple or flange and drops straight (90º) from the Nipple or flange.
VALVE INFO:
Model 19126MCF-2-CC-MS-31-16-10-LA
Size 1” 1500# / 1” 300#
Set Press 1450 PSI
CDTP 1144 PSI
CAP 128 GPM
BP 306 PSI
Inconsistent readings for three test performed;
1.1100
2.1127
3.1118
Note: The above VALVE INFO is identical to the other valve that was tested okay on our bench.
An inspection was done on both valves with reference to 19000 catalogue and revealed that the overall heights were different for A and C dimensions as attached. Can the illustrated dimensions have an effect on the performance testing of the said PRV in comparison to the other PRV that was tested okay?
Thanks and appreciate the feedback.
We are currently performing testing for set pressure indication on an assembled 19126M pressure relief valve and failed to set at the desired set pressure having inconsistent readings each lift. Apart from inconsistent readings, the valve itself did not passed the acceptable test for set pressure indication according to consolidated procedure as stated below but instead had a gush at each test.The said valve was removed and another valve identical to the one in question, same size, model, orifice and set pressure was tested in the same manner and passed set pressure indication with a steady stream at ninety degrees from the valve outlet, no gush and noise.
Consolidated procedure
First continuous flow is the point that the discharge first comes down straight out of the nipple on a 19000 valve or out of the flange on a 1900 valve.
In any case the liquid valve set pressure should occur when the discharge first stops curling(COHESION) under the nipple or flange and drops straight (90º) from the Nipple or flange.
VALVE INFO:
Model 19126MCF-2-CC-MS-31-16-10-LA
Size 1” 1500# / 1” 300#
Set Press 1450 PSI
CDTP 1144 PSI
CAP 128 GPM
BP 306 PSI
Inconsistent readings for three test performed;
1.1100
2.1127
3.1118
Note: The above VALVE INFO is identical to the other valve that was tested okay on our bench.
An inspection was done on both valves with reference to 19000 catalogue and revealed that the overall heights were different for A and C dimensions as attached. Can the illustrated dimensions have an effect on the performance testing of the said PRV in comparison to the other PRV that was tested okay?
Thanks and appreciate the feedback.





RE: Perfomance Testing on a 19000 PRV
JAC
RE: Perfomance Testing on a 19000 PRV
Looks like the PSV is a metal seated liquid service valve.
Also make sure your spring ID is correct, looking at your model, size and set pressure I think it should be; W4250NC (1385-1519 psi)
RE: Perfomance Testing on a 19000 PRV
JAC
RE: Perfomance Testing on a 19000 PRV
Prior to performing the additional tests that you've recommended above,I've attached a picture of my test bench being used to test the PRV.Can you identify if the setup is suitable for testing water PRVs in comparison to other test benches viewed or worked on during your career.
Appreciate your feedback.
RE: Perfomance Testing on a 19000 PRV
JAC
RE: Perfomance Testing on a 19000 PRV
Based on your experience with reference to consolidated PT for air, gas and steam service valves, set pressure must be at a slow and uniform rate(starting from 90% of the anticipated set pressure, not to exceed 2 PSI per second)but rapid enough to cause the valve to open.
Does this also applies for testing of liquid PRVs?
Thanks and appreciate the feedback.