Pilot-operated proportional directional valves types .WRZ…, .WRZE… and .WRH… are two-stage flow control valves actuated by proportional solenoids. They offer mounting on a plate with holes according to DIN 24 340/ISO 4401, availability of emergency actuation and spring-centered piston. The WRZE type has integrated control electronics, while the WRZ requires external electronics, supporting digital or analog amplifiers.