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How to Solve the Problems in the Operation of Gas Butterfly Valve

2018-08-01

The application of gas butterfly valve in enterprise gas pipeline is quite common, and its sealing performance is one of the important problems. Three eccentric gas butterfly valve in the sealing link and on a new step, to solve the valve in the two-way exchange of the medium transport process of sealing problems. The gas butterfly valve consists of a soft seal gas butterfly valve and a hard seal gas butterfly valve, which can achieve zero leakage sealing performance regardless of high temperature and low temperature.

What problems will occur in the operation of the gas butterfly valve? The details are as follows,

1. Due to the limitation of conditions, it is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.

2, because the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scour on its sealing surface, and the soft sealing belt in the metal sheet sandwich is directly affected by the scour. Sealing performance.

3. Due to the principle of rubber-lined butterfly valve, the sealing surface of the valve plate and the valve seat are sealed between the valve plate and the valve seat by the torque of the transmission device. When the channel medium backflow with the increase of the medium pressure between the valve plate and the valve seat unit positive pressure is less than the medium pressure, the seal began to leak.

4. The sealing surface of the valve plate and the valve seat is an oblique cone structure, and the oblique cone surface of the valve plate is overlaid with temperature-resistant and corrosion-resistant alloy materials; the spring fixed between the adjusting ring pressure plate and the adjusting bolt on the pressure plate are assembled together. This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the pressure of the medium, and solves the sealing problem of the valve in the process of two-way exchange of the medium.

For more information on gas butterfly valves, please visit our valve website for more information.

Recommended reading, can the gas butterfly valve reach zero leakage.