Piston Check Valve :

1, the piston check valve discoid flap valve, valve seat around the channel axis for rotary movement, as a result of valve channel streamline, flow resistance than the non-return valve butterfly or small, for low flow rate and flow do not change the large diameter of occasions, but not for the pulsating flow, the sealing performance as jack-up. Single sub-butterfly-type check valve, double valve and most of them type three, which is based on three forms of the valve diameter to sub-purpose is to prevent the media to stop the flow, or back when the impact of reduced water.

2, piston check valve  valve body along the vertical center line of sliding check valve, check valve inside the thread can only be installed on the level of pipeline, in the high-pressure non-return valve on the small-bore ball valve can be. Butterfly valve check valve of the same shape and globe valve (which can be common with the globe valve), so it is a