Vacuum butterfly valve in vacuum valve

EVP vacuum pump manufacturers share knowledge about the function and classification of vacuum valves when introducing vacuum system components. The vacuum butterfly valve, which is widely used in vacuum system, has been asked by many people recently. Therefore, here, we will carefully understand some contents of vacuum butterfly valve.

The structure of vacuum butterfly valve is relatively simple and small in volume. The round butterfly plate is used as the opening and closing part, and the flow channel is opened, closed and adjusted with the rotation of the valve rod. The butterfly plate is fixed on the valve stem and can rotate with the valve stem. The edge is embedded with O-ring (butterfly valve has two seal types: elastic seal and metal seal). The elastic sealing ring can be inlaid on the valve body or attached to the periphery of butterfly plate). As shown in the figure, when the sealing ring on the butterfly plate is in close contact with the valve body, the valve is closed. Starting from the closed position, the valve plate is fully opened when it is rotated by another 90 degrees.

Typical butterfly valve construction

The vacuum butterfly valve has good fluid control characteristics. When it is in the fully open position, the thickness of butterfly plate is the only resistance when the medium flows through the valve body. Therefore, the pressure change produced by the valve is very small, so it has good flow control characteristics. In addition, the driving torque of vacuum butterfly valve is small, and the operation is simple and rapid, so it is widely used in large and medium caliber, medium and low pressure application fields.

There are many types of vacuum butterfly valve: according to the applicable pressure, it can be divided into vacuum butterfly valve, low pressure butterfly valve, medium pressure butterfly valve and high pressure butterfly valve; according to the medium working temperature, it can be divided into high temperature butterfly valve, medium temperature butterfly valve, normal temperature butterfly valve, low temperature butterfly valve and ultra-low temperature butterfly valve; according to the structure, it can be divided into middle line butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve and triple eccentric butterfly valve; according to the connection mode, the vacuum butterfly valve can be divided into three types, It can be divided into clamp (lug) type, flange type, welding type, thread type, clamp type, etc.; according to the actuator, it can be divided into pneumatic butterfly valve, electric butterfly valve, hydraulic butterfly valve, handle drive butterfly valve and worm gear drive butterfly valve.

Various forms of butterfly valves

In addition, butterfly valves can also be classified according to their functions, valve body materials, sealing materials, etc., and the manufacturers of dry-type EVP vacuum pumps will not be listed one by one.

Therefore, the vacuum butterfly valve is only one of the butterfly valves, working in the vacuum system between 1.3 × 10 ^ – 5pa and 1.0 × 10 ^ 5pa.

Different types of vacuum butterfly valve can be selected according to different application and environment.

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