cast iron flanged swing check valve. DN40-DN500MM with the best quality. PN10 PN16 PN25. 

1. Either too low a line velocity or too high a velocity can damage valve internals and shorten valve life.

2.Service in systems involving rapid and frequent flow reversals, pulsation or excessively turbulent flow should be avoided. Locating swing check valves away from elbows, equipment, etc., within the piping system can often minimize or eliminate problems caused by this type of application.

3.Threaded seat rings in valves in services with high velocity (turbulent) flow or thermal cycling should be lock welded to the body to avoid loosening.

4.According to BS STANDARD.

5.With working pressure of PN10,16,25.