F luid inside the valve can reach temperatures above ambient because of the operating temperature of the coil. The hot coil heats the process media which can raise its temperature considerably. Remember, the fluids that may not affect the valve seals at ambient temperature can cause problems at higher temperatures. I know the Hayward solenoid valve is normally closed. I need a normally open one.
T here s no way to change it.
T he valve opens and closes almost instantaneously. The catalog says that the flow velocity through the solenoid valve should not be greater than 5 feet per second. At flow velocities above 5 feet per second, this shock pressure can be great enough to damage the valve, especially the diaphragm seals. You can test it by operating the valve without pressure or flow going through it to verity that that is the cause. When I go to close the valve it makes a chattering sound.