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Soft Seat Butterfly Valve vs Hard Seat Butterfly Valve

  • 2021-06-08 07:07

The butterfly valve has a simple structure, consisting of only a few parts, and saves material consumption; small size, light weight, small installation size, small driving torque, simple and rapid operation, only need to rotate 90° to quickly open and close; and at the same time With good flow adjustment function and closing and sealing characteristics, butterfly valves are the dominant valve form in the use of large and medium calibers and medium and low pressures. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the butterfly plate.

 

Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. The metal seal can adapt to higher working temperature, while the elastic seal has the defect of being limited by temperature. If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structure principle of butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also used in cooling water systems of thermal power stations.

 

Commonly used butterfly valves include wafer type butterfly valves and flange type butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipe flanges. Flange type butterfly valve has flanges on the valve, and bolts are used to connect the flanges at both ends of the valve to the pipe flanges. The strength performance of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that bears internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation.

 

  With the application of anti-corrosion synthetic rubber and polytetrafluoroethylene, the performance of butterfly valves can be improved and meet different working conditions. In the past ten years, metal sealing butterfly valves have developed rapidly. With the application of high temperature, low temperature, strong corrosion resistance, strong erosion resistance, and high strength alloy materials in butterfly valves, metal sealing butterfly valves have been used in high temperature, low temperature, and strong erosion. It has been widely used under other working conditions and partially replaced the globe valve, gate valve and ball valve

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