2/2 Way Servo-Assisted Diaphragm Valve Normally Closed. A minimum differential pressure is required to fully open the valve. The diaphragm spring coupling supports the valve opening operation. The standard version is suitable for use with liquids. A separate version (HP00) is available for gas and vacuum applications in which the valve opens without differential pressure. Various combinations of materials and membranes and of the body are available. The standard brass body meets all European requirements for drinking water. For other sectors, bodies are available in brass without lead, in dezincification resistant brass and in stainless steel. The magnetic coils are encapsulated with epoxy resin resistant to chemical agents. To contain energy requirements, all the coils can be supplied with an electronic reduction in power. With the use of a connector in compliance with DIN EN 17301-803 form A, the valves meet the requirements of IP65 and NEMA 4X degree of protection.