Focus On Triple Offset Butterfly Valve 

Structural characteristics of metal hard seal butterfly valve

Metal hard seal butterfly valve is mainly composed of valve body, butterfly plate, valve shaft, valve body sealing ring, butterfly plate sealing ring, shaft sleeve, self-lubricating bearing and driving device. The high performance metal hard seal butterfly valve drives the valve shaft to rotate through various driving devices, and drives the butterfly plate to rotate within 90 ° through the pin shaft, so that the butterfly plate is in the open or closed state, so as to achieve the purpose of connecting or cutting off. It is widely used in metallurgy, hydropower, thermoelectricity, heating, urban water supply and drainage, farmland irrigation and drainage and other industries. The applicable medium is gas, steam, air and water, etc. in the pipeline system.

Structural characteristics of metal hard seal butterfly valve

Structural features of metal seal butterfly valve:

① The unique design of three-way eccentricity makes the sealing surface drive without friction and extends the service life of the valve.
② The elastic seal is produced by torque.
③ The ingenious wedge design enables the valve to have the automatic sealing function of closing more and more tightly, with compensation and zero leakage between the sealing surfaces.
④ Small volume, light weight, light operation and easy installation.
⑤ According to the user’s requirements, pneumatic and electric devices can be configured to meet the needs of remote control and program control.
⑥ The material of replacement parts can be applied to all kinds of media, and can be used for lining anti-corrosion (F46, gxpp, Po, etc.).
⑦ The sealing ring is made of stainless steel, which has the double advantages of metal hard seal and elastic seal. It has excellent sealing performance both at low temperature and high temperature.

Difference between metal hard seal butterfly valve and rubber seal butterfly valve:

The disadvantage of rubber seal butterfly valve is that when it is used for throttling, it will produce cavitation due to improper use, which will cause peeling and damage of rubber seat. For this reason, now the international development of metal seal butterfly valve, metal hard seal butterfly valve for eccentric metal seal structure, sealing form for metal to metal seal, replaceable metal seal ring for metal seal, stainless steel plate and graphite composite plate seal ring for metal seal. The high performance elastic metal seal butterfly valve adopts a double eccentric and a special inclined cone elliptical seal structure. It solves the problem that the sealing surface of traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing from 0 ° to 10 ° and realizes the effect that the sealing surface is separated at the moment of opening and sealing at the moment of closing, so as to prolong the service life and achieve the best sealing performance.

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