Product description: ZPB-11/21 pneumatic single-directional position retaining valve is one of the actuator accessories, it is used with pneumatic film actuator or bidirectional piston pneumatic actuator. When the air source system fails, it can automatically cut off the air inlet and exhaust channel of the pneumatic actuator to keep it in the position of the accident and ensure that the position valve can automatically return to normal work. So the pneumatic holding valve in the important automatic control circuit as a safety protection instrument.

Structural principle

Pneumatic position retaining valve is designed according to the principle of force balance. It is composed of: adjusting screw, locking nut, adjusting spring, air loss, diaphragm, signal pressure film chamber, valve body, diaphragm, valve, valve spring, lower film chamber and outer cover, upper and lower valve body and other parts.

Technical parameter

Ambient temperature: -25 ~ +55℃;

Relative humidity: 5% ~ 95%;

Vibration frequency: 10 ~ 50Hz; Amplitude 0.15mm;

Set pressure adjustment range: 0.14 ~ 0.7MPa;

Channel pressure: 0.02 ~ 0.7MPa;

Sensitivity: 0.010MPa;

Pipe thread: ZG1/4” ;

Dimensions: φ 60× 142 (Type ZPB-21), φ 60× 106 (Type ZPB-11);

Weight: 0.77㎏ (ZPB-21 type), 0.77㎏ (ZPB-21 type).