The check valve is also called or a one-way valve, its role is to prevent 

the backflow medium pipeline.The bottom valve of the pump suction 

off also belong to the check valve class.Open-close part by medium 

flow and power to open or closed, to prevent the backflow medium 

valve check valve.Check valve belong to automatic valve class, mainly 

for the one-way flow of medium pipeline, only allowed to medium 

flows in one direction, in order to prevent accidents.

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.

FAQ

We have organized several common questions for our clients，may help you sincerely：

①How about your company？

A world class manufacturer & supplier of castings forging in carbon steel and alloy steel，is one of the large-scale professional investment casting production bases in China,consisting of both casting foundry forging and machining factory. Annually more than 8000 tons Precision casting and forging parts are exported to markets in Europe,America and Japan. OEM casting and forging service available according to customer’s requirements.

②How to guarantee the quality of the products？

We have established the international advanced quality management system，every link from raw material to final product we have strict quality test；We resolutely put an end to unqualified products flowing into the market. At the same time, we will provide necessary follow-up service assurance.

③How long can we receive the product after purchase?

In the purchase of product within three working days, We will arrange the factory delivery as soon as possible. The pecific time of receiving is related to the state and position of customers.Commonly 7 to 10 working days can be served.