Water shut-off valves

[Neurorad]

The ELK-WSV is not normally closed or normally open - voltage is used to turn it.

It can be manually operated using a wrench, but I'll put it in-line with a handle ball valve.

Thanks for the tip, Digger.

 

[Digger]

The ELK-WSV is not normally closed or normally open - voltage is used to turn it.

It can be manually operated using a wrench, but I'll put it in-line with a handle ball valve.

Thanks for the tip, Digger.

Correct the ELK valve is specifically designed to be used for this application (energize to change state from open-close-open etc but not constantly engergized). A boiler zone valve is normally closed and energized (T-Stat relay closes) to open and once power is removed (T-Stat relay opens) closes (if I remember correctly from the days I had a baseboard hot water heating system). In that case it would have to be energized all of the time for water to flow and in my opinion not the best type of valve for the application the ELK-WV was designed for.

 

[john.extremenetworks]

Depending on the zone valve mechanics, not all of them would be considered Normally Closed. The White Rogers valves I have used have a stepper motor inside that rotates the valve body. The "Thermostat" input line would need to be kept closed, but the valve is drawing very little power to stay open. Opposed to a magnetic solenoid type valve where the coil would need to stay energized to keep the valve open.

Back to suitable for drinking water. Many of the valves are just a brass body with a steel valve that turns inside. Only 1 o-ring is used, which would probably be fine for the application. The o-ring isn't even in the direct flow of water. If I get a chance today I'll try find out if there is actually a drinking water spec on these valves.