1 We are committed to providing safe and cost-effective transmission and control technology for all kinds of machinery and system equipment.. 2 Rexroth solenoid valves and all stainless steel; isolation diaphragms are required for corrosive media. For neutral medium, the solenoid valve with copper alloy as the valve housing material should also be selected. Otherwise, rust debris often falls off in the valve housing, especially in the case of infrequent action. For ammonia valves, copper should not be used.. 3 Explosive environment: Corresponding explosion-proof products must be selected. Waterproof and dust-proof varieties should be selected for outdoor installation or dust dusts.. 4 Nominal pressure of solenoid valve shall exceed the maximum working pressure in pipe.