The valve is opened or closed by the valve disc to rotate around the spindle outside the valve seat; and it is an automatic valve when it is automatically opened or closed by the force generated by the medium flowing within the pipeline. Its major function is to prevent the backflow of the medium in the pipeline, reverse rotation of the pump and its driving motor, and discharge of the medium in the container.

Design Features
Compact and reasonable product structure, reliable tightness and good performance;
Smooth fluid passageway and small fluid resistance;
Swing type disc.
Can be designed with a Damping Cylinder.
Rapid closing and flexible actions of the valve disc .
Small closing impact, water hammer is not liable to be generated.
Smooth fluid passageway and small fluid resistance.

Product Range
Body material: carbon steel, stainless steel, alloy steel
Nominal diameter: 1/2″～42″
Pressure range:Class150～2500
End connection: RF, RTJ, BW
Working temperature:-196℃～+560℃

Standards:
Design and manufacture: BS 1868, API 6D, ASME B16.34
Face to face/end to end: ASME B16.10, API 6D, DIN 3202
Pressure temperature rating: ASME B16.34
BW end dimension: ASME B16.25
End flange dimension: ASME B16.5, ASME B16.47
Inspection and test: ISO 5208, API 598