... Product Description SV series two ways normal closed solenoid valve with diaphragms can be widely used in refrigeration ... , also in boiler and fire-fighting, etc.Solenoid valves use full-closed magnetic coil and DIN ... small orifice. Then the pressure in upside of valve reduced, so the pressure difference between both ... /507,air,water and oil.Optional voltage of solenoid coils: A.C.: 24V,36V,110V,220V, ...