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Why are butterfly valves fitted with bypasses? What is the purpose of the bypass?
Release time:
Sep 18,2025
In conclusion, bypass butterfly valve is an important industrial valve with simple structure, easy installation and flexible operation, which is widely used in piping systems in various fields and provides reliable fluid control solutions for industrial production.
Bypass butterfly valves are a common type of industrial valve, which is usually used to switch or regulate fluid between two pipelines in a piping system. Bypass butterfly valve can be operated manually or automatically to achieve the control of fluid, so as to meet the requirements of industrial production on the direction and flow of fluid.
The butterfly valve with bypass is based on the double eccentric valve，the designer changes the series 14 to F5 and add the bypass valve on the body. It consists of the main valve，the integral bypass pipe and bypass valve.
Butterfly valves are fitted with bypass valves mainly to avoid damage to the main valve transmission and sealing parts due to excessive opening torque caused by high pressure before and after the valve when the main valve is opened during operation.
So the bypass valve can be opened before the main valve is opened. Reducing the pressure in front of the valve so that the difference between the pressure after the valve and the pressure in front of the valve is reduced, reducing the torque when opening the main valve，that will make it easy to open the main valve and extend the life of the main valve. Similarly, when closing, close the main valve first, then close the bypass valve.
The main features of bypass butterfly valve are simple structure, easy installation, good sealing performance and flexible operation. It consists of valve body, valve cover, valve seat, valve flap, etc. It is usually made of cast steel or stainless steel, with high corrosion resistance and pressure resistance.
Bypass butterfly valve is widely used in pipeline systems in petroleum, chemical, electric power, metallurgy and other fields to regulate the flow of fluids and flow to ensure the normal operation of the production process. In the process of petroleum refining, bypass butterfly valves can be used to control the diversion of fluids between different pipelines to achieve the manufacture of different products. In chemical production, bypass butterfly valves can be used to regulate the feed and discharge of the reactor, and control the temperature and pressure of the reaction process.
In conclusion, bypass butterfly valve is an important industrial valve with simple structure, easy installation and flexible operation, which is widely used in piping systems in various fields and provides reliable fluid control solutions for industrial production.
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