T he catalog says that the valve is rated at 150 psi, yet the valve specs say that the inlet pressure can t be above 120 psi. I t is normally closed. When there is no power to the valve, it is in the closed position. It can be in the open position, with power applied, all the time without problems. Particulate matter can prevent the piston from completely closing the valve - causing leakage.
T here is none and none is needed.
The outside temperature of the coil can reach 180F in normal operation and will cause no damage to the valve. 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.