Corrosion resistant lining fluorine lining swing check valves H44F back-pressure valve

Stamdard 

Design:GB 12239

Face to face:JB 1688

Flange dimension:JB 78 Or accoring to contract

Test:GB/T 13927

Symbol:GB 12220

Supply: GB/T 12252

Usually, the fluid under pressure to make the disc of the valve opening, and exported from flow inlet side to side.When the import side pressure is lower than the export side, the disc under the action of fluid pressure and gravity itself automatically to channel closed, to prevent fluid backflow.Disc in different ways, according to the check valve is mainly divided into the lift, swing and butterfly 3 classes.Lift check valve body more similar to cut-off valve body, the fluid resistance is larger.This type of check valve for high pressure small, often using the disc and spherical shape.Swing check valves on the fluid resistance is small, suitable for medium and small size, low pressure, large diameter pipelines, often on the channel baffle valve set up multiple disc, become more disc type.Similar to the shape of the butterfly check valve and butterfly valve.It has simple structure, small resistance for fluid.Check valve such as closing too fast, could cause a liquid in the liquid pipe, noise, and even cause the damage of valve parts.In order to avoid this kind of situation, when need can choose buffer function of the check valve, extend the closing time.