Tel.: +86 18263855173

Tel.: +8613969585200


Home >> News

How Does the Refrigerant Check Valve Work?

Released on Apr. 07, 2021

The refrigerant check valve is a part of controlling the flow direction of refrigerants in the refrigeration system. The refrigerant check valve’s main function is to prevent the reduction of cooling efficiency of the system when the compressor stops work.

What is a refrigeration check valve?

The refrigeration check valve refers to a valve whose opening and closing parts are circular discs and rely on its own weight and medium pressure to generate actions to block the backflow of the medium. It is an automatic valve, also known as a check valve, one-way valve, return valve or isolation valve.

The movement of the disc is divided into lift type and swing type. The lift-type refrigeration check valve is similar in structure to the stop valve but lacks the valve stem that drives the valve disc. 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.

Refrigerant Check Valve

How does the refrigerant check valve work?

When you install the refrigeration check valve in the system, it will rapidly balance the high pressure and low pressure inside of the compressor when the compressor stops working, when it reaches balance, then the refrigerants won’t flow until the air conditioning or the refrigeration unit restarts.

The refrigerant check valve is mostly used for large size and medium size refrigeration units and air conditioning equipment. In our traditional check valve field, the steel ball structure is widely used, which means we usually use steel balls as the valve core. And use welding, flare, or flange connection to seal. In the system, you can only install the refrigeration check valve vertically.

At the same time, the flow resistance of refrigerant is huge, and the valve core doesn’t have the function to close itself automatically when the refrigerant consumption is becoming very large, which will affect the whole refrigeration system’s performance.


The main parts for the refrigeration check valve 

1.Inlet 2.Valve body 3.Filter 4.Valve seat 5.Magnetic stripe 6.Diaphragm 7. Starting point 8. Guide rod 9.Endpoint 10.Diaphragm base

When using, welding the refrigerant check valve to the refrigeration system, ensure match the whole system. When it works, the refrigerant enters the check valve body through the inlet, flow to 3 filter screen and rush to the diaphragm, and this force will make diaphragm defeat the pressure that coming from magnetic stripe and leaves 4 valve seat sealing line(starting point) along the inner of the guide rod and move to 9 endpoints.

The valve opens, the refrigeration system starts work. When the valve needs to be closed, which means the refrigerant pressure of the inlet is smaller than the pressure from the magnetic stripe, the diaphragm will move to 7 starting point along the inner of the guide rod, the valve closes and the refrigeration system stop working.