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Design And Analysis Of Structural Characteristics Of Vacuum Butterfly Valve
- Oct 23, 2017 -

Vacuum butterfly valve is in the chemical industry, building materials, power plants, glass and other industries in the ventilation, environmental protection projects and dust cold air or hot air gas pipeline, as a gas medium to adjust the flow or cut off the device configuration.

Vacuum butterfly valve product features:

1. The use of midline discs and short structure of the new type of structural design and manufacture of steel, compact, light weight, easy to install, flow resistance is small, the flow of large, to avoid the impact of high temperature expansion, light operation.

2. No connecting rod, bolts, etc., reliable, long service life. Can be multi-station installation, not affected by the flow of media.

Vacuum butterfly valve structural features: the use of midline disc and short structure of the new type of structural design and manufacture of steel, compact, light weight, easy to install, flow resistance is small, large flow, to avoid the impact of high temperature expansion, light operation. The body without connecting rods, bolts, etc., reliable, long service life. Can be multi-station installation, not affected by the flow of media.

But the vacuum butterfly valve in the course of the use of some problems still exist:

1. Because the multi-layer soft and hard seal seal fixed to the valve plate, when the valve plate normally open state of the media to form a positive surface of its sealing, metal sheet sandwich in the soft seal band after erosion directly affect the sealing performance.

2. Restricted by the structural conditions The structure is not suitable for the following DN0 diameter valve, because the overall structure of the valve plate is too thick, large flow resistance.

3. Due to the principle of lining the butterfly valve, the seal between the sealing surface of the valve plate and the valve seat is caused by the torque of the transmission device to the valve plate to the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal. When the flow path medium countercurrent with the media pressure increases the valve plate and the valve seat between the positive pressure is less than the medium pressure, the seal began to leak.

Therefore, the utility model does not install the soft and hard multi-layer sealing ring on the valve plate as in the prior art, but is directly installed on the valve body, and it is very ideal to add the adjusting ring in the middle of the platen and the valve seat. The It will replace the gate valve, and the ball valve.