Zibo Weiheng Valve Co., Ltd., March 2nd: Pneumatic three eccentric hard seal gas butterfly valve is a type of regulating valve with few components, which is extremely convenient to use. The pneumatic three eccentric hard sealed gas butterfly valve plays a role in disconnecting and throttling on the gas pipeline. Today, Weiheng Valve Network will introduce the shortcomings and treatment methods of ordinary gas butterfly valves in application.

1、 Due to the multi-layer soft and hard stacked sealing ring fixed on the valve plate, when the valve plate is in a normally open state, the medium forms a positive flushing on its sealing surface. The soft sealing tape in the metal sheet interlayer is directly affected by the flushing, which directly affects the sealing performance.

2、 Due to structural limitations, this structure is not suitable for valves with diameters below DN200, as the overall structure of the valve plate is too thick and has high flow resistance.

3、 Due to the principle of the three eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat is achieved by the torque of the transmission device, which presses the valve plate against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the sealing compression. When the medium in the flow channel flows backwards and the unit positive pressure between the valve plate and the valve seat is less than the medium pressure as the medium pressure increases, the seal begins to leak.

Comparison of Weiheng patented products with ordinary gas butterfly valves

In summary, ordinary gas butterfly valves and ordinary eccentric butterfly valves cannot seal well, while the line sealed gas butterfly valve (patented product) produced and developed by Zibo Weiheng Valve Co., Ltd. effectively solves the problem of poor sealing with its unique spherical line sealing structure.