Pneumatic hard seal butterfly valve structure is composed of imported pneumatic piston actuator and three core hard seal butterfly valve, commonly known as pneumatic three eccentric gold flexible seal butterfly valve. The valve seat adopts hard seal compatible multi-level structure, exquisite processing and advanced technology. Pneumatic hard seal butterfly valve and electric valve positioner, input 4~20mADC signal and 0.4 ~ 0.7mpa gas source can control the operation, can realize the adjustment of pressure, flow, temperature, liquid level and other parameters. The pneumatic hard seal butterfly valve is equipped with a travel limit switch, an electric touch valve, a pressure reducing valve and a 0.4-0.7mpa air source, which can realize the switch operation and send two pairs of passive contact signals to indicate the valve switch.

The hard seal butterfly valve is a three-eccentric gold bend sealing structure, the sealing form is gold bend sealing, the replaceable gold bend sealing ring is gold bend sealing, and the stainless steel plate and graphite composite plate sealing ring is gold bend sealing. Hard seal butterfly valve drive in addition to the form of electric: manual, wheel rod drive, pneumatic, etc. This valve is generally installed horizontally.

Pneumatic hard seal butterfly valve structure is composed of imported pneumatic piston actuator and three core hard seal butterfly valve, commonly known as pneumatic three eccentric gold flexible seal butterfly valve. The valve seat adopts hard seal compatible multi-level structure, exquisite processing and advanced technology. Pneumatic hard seal butterfly valve and electric valve positioner, input 4~20mADC signal and 0.4 ~ 0.7mpa gas source can control the operation, can realize the adjustment of pressure, flow, temperature, liquid level and other parameters. The pneumatic hard seal butterfly valve is equipped with a travel limit switch, an electric touch valve, a pressure reducing valve and a 0.4-0.7mpa air source, which can realize the switch operation and send two pairs of passive contact signals to indicate the valve switch.

The butterfly plate of the hard seal ball valve is installed in the diameter direction of the pipeline. On the cylinder body channel of the hard seal ball valve, the disc solution plate rotates around the axis, and the rotation angle is 0 ° ~ -90 °. When it rotates to 90 °, the valve is in a fully open state. At present, the hard seal ball valve as a pipe system for the realization of the on-off and flow control components, has been widely used in petroleum, chemical, metallurgy, hydropower and other fields. In the known butterfly valve technology, the sealing form is a sealing structure, and the sealing material is rubber, polytetrafluoroethylene, etc. Due to the limitation of structural characteristics, it is not suitable for high temperature, high pressure, corrosion resistance, wear resistance and other industries.

Principle: When the valve is opened, the hot plate and the valve seat are in contact with each other at the moment of closing, and the butterfly plate eccentric 1 and eccentric 2 are quickly separated from the valve seat to reduce the wear of the sealing pair, the friction torque is small, and the opening is flexible. 3, eccentric cone, so that when the valve is opened or closed, the valve can be through the inner hole of the valve seat, to achieve contact seal. In addition, the rotation radius of the conical butterfly plate is greater than the rotation radius of the sealing pair contact position, so the butterfly plate will become tighter and tighter when the valve is closed, which can achieve self-locking and prevent the butterfly plate from over-positioning.

There is also a comparison of hidden valve is three eccentric metal hard seal butterfly valve, valve body and valve seat are connected components, valve seat sealing surface surfacing temperature is high, corrosion-resistant alloy material. Compared with the traditional butterfly valve, this implicit valve has the advantages of high temperature resistance, easy operation, and no friction opening and closing. When closed, the torque of the transmission mechanism increases, compensates for the seal, improves the sealing performance, and extends the service life of the creep valve.