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Fine Water Mist Control Valves

Fine Water Mist Control Valves

Fine Water Mist Control Valves

(OP)
We have a low pressure (<200 psi) fine water mist system installed in a powerhouse.  The water source is potable with a static pressure of ~100psi and a positive displacement pump to step it up.

The distribution control valves are solenoid operated pilot valves and they leak due to the static system pressure.  The manufacturer is basically saying that leakage has to be expected and there is nothing that can be done.  I can see that there are standards for the amount of acceptable leakage (class I through VI) but sprinkler systems don't leak out of the nozzles like this system is doing.  It seems to me that either a manifold type valve should be used or a leakage check valve the bleeds off low pressure leakage but closes on operating pressure.

I am an electrical engineer and would appreciate an expert opinion on how this leakage can be dealt with. I simply cannot believe it is acceptable practice for a fire system to leak out of the nozzles.  Thanks!

RE: Fine Water Mist Control Valves

Sounds like the 100 psi is pushing water through the pump, which is not running.  Consider an automated ball valve in the suction line that opens a few seconds before the pump comes on and closes a few seconds after the pump goes off.

Good luck,
Latexman

RE: Fine Water Mist Control Valves

But if this system/power house is governed by NFPA, make sure it is a NFPA approved device (or whatever jurisdictional authority).

rmw

RE: Fine Water Mist Control Valves

Find a new vendor!!

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