1, swing check valves: kai xuan-check valve disc is disklike, around the seat channel for shaft rotary motion, because in the valve channel into stream line, flow resistance than movements kai-check China valve is small, be applicable to the low velocity and flow changes rarely of large diameter occasions, but unfavorable for pulse flow, its sealing performance than lift type. Kai xuan-check valve points single type, double disc type and mostly type 3 kinds, the three main forms according to the valve diameter to points, the goal is to prevent backflow medium cease to flow or when, abate hydraulic shock.

2, movements kai-check China valve: disc along body vertical centerline sliding check valve, movements kai-check China valve can only be installed in horizontal pipe runs in high voltage small-bore check valve disc can adopt sphere. Movements kai-check China valve body shape and globe valves and valve as (general), so it