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Posted by Brian R on March 27, 2004 at 21:36:58:
Has anyone here ever rebuilt a Spence PRV?
I am rebuilding a D and E type.
I've disassembled the main valve and pilot, replaced the gaskets, spring, diaphragms and replaced the brass fittings.
The pilot is accuated with air, 3-20psi for a steam pressure range of 20-60psi.
I assembled and tested the prv with air but I am having problems staying under pressure.
I've blanked the ends and put gauges. At 100psi AIR, the discharge reads 0 Psi. If I block the tubing going to the pilot, the pressure will rise to equal the incoming pressure.
At first I thought the problem was with the main valve stem being too long, so I cut it and set the dowel. The clearance is now 3/64... but I have te same problem.
Is the problem with pressure regulation from the pilot? I haven't reworked because my shift ended, but I want to hit the ground running tomorrow.
Any luck? =]
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