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Spence PSI Regulator (PRV)


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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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