1, check valve function: prevent medium reverse flow, prevent pump and drive motor reversal, as well as the discharge of container medium.

2, check valve refers to the valve that automatically opens and close the valve disc depending on the flow of the medium itself, and it is also used to prevent the backflow of the valve. It is also called the check valve, check valve, counterflow valve and back pressure valve. The check valve is a kind of automatic valve.

3. The check valve is divided according to the structure, which can be divided into three types: lift check valve, swing check valve and butterfly check valve.

The lifting type check valve is divided into two types, vertical and horizontal.

The swing check valve is divided into three types, single valve type, double valve type and multi valve type.

Butterfly check valve is straight through.

The above several check valves can be divided into four types, which are threaded connection, flange connection, welding connection and clamp connection.

4, check valve (Check Valve) installation should pay attention to the following

A, do not bear the weight of the check valve in the pipeline, and the large check valve should be supported independently so that it is not affected by the pressure produced by the pipe system.

B, when installing, the direction of the flow of the medium should be in accordance with the direction of the body's arrow.

C, lift type vertical valve check valve should be installed on the vertical pipe.

D, lift horizontal valve check valve should be installed on the horizontal pipe.