The high temperature ball valve is a metal sealing structure, the sealing form is a metal to metal seal, the metal sealing ring can be replaced with a metal seal, and the stainless steel plate and the graphite composite plate sealing ring are metal sealed. In addition to electric, the hard-seal butterfly valve has a manual, worm-wheel drive, pneumatic and the like. The disc of the high temperature ball valve is mounted in the diameter direction of the pipe. In the cylindrical passage of the hard-sealing ball valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation is 90°, the valve is fully open.
Application field
At present, corrosion-resistant ball valves and hard-sealed butterfly valves are widely used in many fields such as petroleum, chemical, metallurgy, high-temperature ball valves (11 sheets), water and electricity, etc. as a component used to realize the on-off and flow control of pipeline systems. . In the well-known butterfly valve technology, the sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene or the like. Due to structural limitations, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively advanced butterfly valve is a three-eccentric metal hard sealing butterfly valve. The valve body and the valve seat are connected members, and the sealing surface layer of the valve seat is welded with a temperature-resistant and corrosion-resistant alloy material. The multi-layer soft stack sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, the butterfly valve has high temperature resistance, is light in operation, and has no friction in opening and closing. When closing, the seal is compensated with the increase of the torque of the transmission mechanism, and the butterfly valve is improved. The sealing performance and the advantage of extending the service life.
Precautions
1. Since the multi-layer soft and hard stack sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a front surface flushing on the sealing surface thereof, and the soft sealing band in the metal sheet interlayer is directly washed to affect the sealing performance.
Second, limited by structural conditions The structure 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.
3. Due to the principle of the three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the seal extrusion. When the flow medium is reversed, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure as the medium pressure increases, and the seal begins to leak.
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