The ZPB-11/21 pneumatic single and bidirectional holding valve is one of the actuator accessories, which is used in conjunction with pneumatic diaphragm actuators or piston type pneumatic actuators with bidirectional action. When the gas source system malfunctions, it can automatically cut off the intake and exhaust channels of the pneumatic actuator, keeping it in the position in case of an accident, ensuring that the position valve can automatically resume normal operation. Therefore, pneumatic holding valves are used as safety protection instruments in important automatic control circuits.

Technical specifications of ZPB-11/21 pneumatic single and bidirectional holding valve
Environmental temperature: -25 to+55 ℃;
Relative humidity: 5% to 95%;
Vibration frequency: 10-50Hz; Amplitude 0.15mm;
Set pressure adjustment range: 0.14-0.7MPa;
Channel pressure: 0.02-0.7 MPa;
Sensitivity: 0.010 MPa;
Connection thread: ZG1/4 ";
Dimensions: φ 60 × 142 (ZPB-21 type), φ 60 × 106 (ZPB-11 type);
Weight: 0.77 kg (ZPB-21 type), 0.77 kg (ZPB-21 type).