Deluge Line Philsophy

Hello Jose It is absolutely fine to have de-energise Solenoid to have deluge operated. Deluge system works with counter balancing philosophy and has water pressure on both sides with additional air pressure on one side to keep the deluge closed. As soon as air pressure is removed, the water presssure on one side will open the deluge as thne area on that side is bigger than the area on other side. Hope I am bale to clarify cheers

What you explain is the dry alarm valve: a balance of low air pressure and high water pressure.

But indeed it is normal to use normal open solenoids in this case.

It is even mandatory as the valve is to be used in a security system.

Hi there,

We use de-energise to trip on deluge systems - fail safe. The control valve is also fail open.

In other words the instrument air keeps the valve closed while the solenoid is energised.

So, if you loose power, and/or instrument air the deluge valve would open. This is done because you might have a fire that burns your signal cable.

We also have a manual overide on our solenoids for testing purposes. We have mechnical block valves upstream of the deluge control valve to isolate if needed.

Regards,

Craig