Two arch disc are fixed onto the valve body with a spindle on which two torsional springs are equipped for installing the butterfly plate onto the valve body sealing face. The butterfly plate pressed by the springs is opened by relying on the medium pressure, and the valve is closed by the spring force and the medium pressure under backflow. It can be installed on horizontal and vertical pipelines.

Design standard as per: API 594, API 6D,ASME B16.34, GB/T 12236.

Compact and reasonable product structure, reliable tightness and good performance;
Small volume and light weight;
Applied widely;
Rapid closing and flexible actions of the valve clack
Small closing impact, water hammer is not liable to be generated;
Smooth fluid passageway and small fluid resistance;

Body material: carbon steel, stainless steel, alloy steel

Nominal diameter: 1/2″～48″（DN15~DN1200）

Pressure range: Class150～2500（PN10~PN420）

End connection: RF, RTJ

Working temperature:-196℃～+560℃

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 standard as per: BS1868,ASME B16.34, GB/T 12236.

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.

Body material: carbon steel, stainless steel, alloy steel

Nominal diameter: 1/2″～60″（DN15~DN1500）

Pressure range:Class150～2500（PN10~PN420）

End connection: RF, RTJ, BW

Working temperature:-196℃～+560℃