How Should Butterfly Valve Choose?

As a Butterfly Valve Leading Manufacturer, share with you.

If the flanged butterfly valve is required to be used for flow control, the first thing is to correctly select the size and type of the butterfly valve.

The structural principle of butterfly valve is especially suitable for manufacturing large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems in thermal power stations. Commonly used butterfly valves include wafer butterfly valves and flange butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipeline flanges. Flanged butterfly valve has flanges on the valve, and the two flanges of the valve are connected to the pipeline flanges with bolts.

DIN F5 Gate Valve

When 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 that occurs through the valve will be small, and it is estimated that it has better flow control characteristics. 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. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being restricted by temperature. The use of stainless steel heads needs to pay attention to the direction of measuring the outer circumference of the head. The measured outer circumference of the head is divided into 4 equal parts, and then marked on the cylinder and the head.

If you don't pay attention to these problems when installing the butterfly valve, it will cause big troubles in future use. Let me tell you what are the precautions.

Butterfly valve is nothing more than adjusting flow and pressure. Valve adjustment is achieved through pressure loss.

The relationship curve between the flow rate and the rotation angle of the butterfly valve is like an integral symbol, which is a parabolic shape. When the angle of rotation is increased under certain circumstances where the opening of the butterfly plate is greater than 60°, the flow rate changes less. Similarly, there is a similar situation when the disc rotation angle is less than 15°.

In order to achieve a good adjustment effect, the following points should be noted:

A. The loss of the regulating valve accounts for at least 1/3 of the system.

B. In order to obtain a good adjustment effect, the diameter of the valve is often smaller than the diameter of the corresponding pipe.

C. According to experience, the diameter of the valve should be determined so that the valve flow rate reaches 5m/s.

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