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Introduction of the check valve


Introduction of the check valve:

Check valve refers to a valve whose opening and closing part is a circular disc and acts by its own weight and medium pressure to block the back flow of the medium.

It is an automatic valve, also known as a check valve, a one-way valve, a return valve or an isolation valve. The movement mode of the valve disc is divided into lift type and swing type.

The lift check valve is similar in structure to the globe valve, except that it lacks the valve stem that drives the valve disc.

The working principle of the check valve:

The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the weight of the disc and its flow resistance, the valve is opened. Conversely, the valve is closed when the medium flows back. The swing check valve has a disc that is inclined and can rotate around the axis, and the working principle is similar to that of the lift check valve.

Introduction of the check valve:

The check valve is often used as the bottom valve of the pumping device, which can prevent the back flow of water. The check valve is used in combination with the globe valve, which can play the role of safety isolation.

The disadvantage is that the resistance is large and the sealing performance is poor when closed.

Precautions of installation:

  • Do not allow the check valve to bear the weight in the pipeline system.
  • The large check valve should be supported independently so that it will not be affected by the pressure generated by the pipeline system.
  • When installing, pay attention to the direction of medium flow should be consistent with the direction of the arrow marked on the valve body.
  • The lift-type vertical flap check valve should be installed on the vertical pipeline.
  • The lift-type horizontal flap check valve should be installed on the horizontal pipeline.

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