Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive.
Built in Wafer Lug Double Disc Check Valve
Metal seal or rubber seal
The valve body passageway is designed in a wing-shaped streamline type, allowing the medium to flow through the passageway rapidly and steadily with no noise. It is opened or closed by the valve clack moving to-and-fro through the valve body guiding axle under the spring effect. It can be installed on horizontal and vertical pipelines.
Carbon Steel, Stainless Steel, Alloy Steel, ect
Inside and outside epoxy coating
Applicable temperature: -196-540 different raw material for different work temperature
Applicable medium: Water, oil, gas and other causticity medium (different raw material for different medium)
About this product:
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.
Main Parameter Specification
Design and Manufacture: API594, API 6D, JB/TB8937;
Inspection and Test: API598, JB/T9092;
Face to Face: API594, DIN3202, JB/T8937;
Pressure-Temperature Rating: ASME B16.34, DIN2410, GB/T9124, SH3406, JB/T74;
Pipe Flange: JB/T74-90, JB/T9112-9124, ASME B16.5, GB/T13402, API605, ASME B16.47.