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Check Valve Good Processing Technology
Oct 11, 2017

Check valve, also known as check valve or check valve, its role is to prevent the pipeline in the medium back. Water pump off the end of the valve also belong to the check valve class. The opening and closing of the medium by the medium flow and the force to open or close itself to prevent the medium back valve called the check valve. Belonging to the automatic valve class, mainly for the medium flow of the pipeline, only to allow the media to flow in one direction to prevent accidents.

Check valve structure can be divided into:

First, the lift check valve:

The check valve can be mounted on a horizontal pipe along the vertical centerline of the valve body. The ball valve can be used on a high pressure small diameter check valve. The shape of the valve body of the lift check valve is the same as that of the shut-off valve (which can be used with the globe valve), so its fluid resistance coefficient is large.

Second, the swing check valve:

The check valve for the spool around the spool of the valve seat is more common for swivel check valves.

Third, disc check valve:

A check valve that rotates around a pin in a seat. Disc-type check valve structure is simple, can only be installed in the horizontal pipe, the seal is poor.

Fourth, the pipeline check valve:

A valve that slides along the centerline of the valve body. Pipeline check valve is a new type of valve, its small size, light weight, processing technology is good, is one of the direction of development of the check valve. But the fluid resistance coefficient is slightly larger than the swivel check valve.

Installation should note the following:

1, do not make the check valve in the pipeline to bear the weight, large check valve should be independent support, so that the pressure generated by the impact of piping.

2, the installation of attention to the flow direction of the media should be the same direction with the valve body arrow.

3, lift vertical flap check valve should be installed in the vertical pipe.

4, lift the level of the valve check valve should be installed in the horizontal pipe.

Check valve working principle analysis:

The role of this type of valve is to allow only the medium to flow in one direction, and to prevent the direction of flow.

Usually the valve is automatically working, in a direction of the flow of fluid under pressure, the valve flap open; fluid flow in the opposite direction, by the fluid pressure and the valve flap from the valve seat in the valve seat, thus cutting the flow. The check valve belongs to this type of valve, which includes a swivel check valve and a lift check valve. The swivel check valve has a hinge mechanism, and a valve-like valve flap free to rest on the inclined seat surface.

In order to ensure that the valve flap reaches the proper position of the valve seat each time, the valve flap is designed in the hinge so that the flap has sufficient swivel space and the flap is truly and fully accessible to the valve seat. The flap can be made entirely of metal, or it can be embedded in metal with leather, rubber, or synthetic coverage, depending on the performance requirements. Swing check valve in the fully open condition, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small.

The flap of the lift check valve is located on the valve seat sealing surface of the valve body. This valve in addition to the valve can be free to lift, the rest as the same as the valve, the fluid pressure to the valve from the valve seat sealing surface lift, the media back to the valve back to the valve seat, and cut off the flow. Depending on the conditions of use, the disc may be of the all-metal structure and may be in the form of a rubber pad or a rubber ring in the flap frame.

  Like the shut-off valve, the passage of the fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than the swivel check valve and the flow of the swivel check valve is limited Very few





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