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At my church, we have a fairly old boiler system. The system was just passed for annual inspection, but it is failing to refill after having been drained. There is absolutely no water flowing past the reducing valves (yes, plural), and the one with a fast-fill handle on it is rusted solid.

So the way these are connected is:

Water Main
Shut-off valve
One-way Check Valve
Pressure reducing valve #1
Pressure reducing valve #2 -----------------------
|                                                 |
|                                                 |
"Backflow preventer" (Per the church janitor)     |
                                            |-----Expansion Tank 

Reducing valve #1 is a simple 1/2" valve with a jam nut on top. Reducing valve #2 is similar, but has a fast-fill handle on top as well and instead of just being a pass-through style, there's a third fitting on the bottom that goes over to a big brass valve on the expansion tank.

My questions are thus:

  1. Is there really a need for 2 valves?
  2. When purchasing a replacement, do I need to match anything specific?
  3. Once the new valve(s) is(are) installed, how would I go about adjusting them?
share|improve this question
So I just did a little bit of research and found that it's not 2 reducing valves, but a reducing valve/pressure relief valve combo unit. The handle that I thought was a fast-fill handle is actually on the relief valve, and the fact that it's rusted closed frightens me. – Skudd Jun 6 '13 at 2:39
While ASCII art is neat, actual pictures would be more helpful. – Tester101 Jun 6 '13 at 14:46

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