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.
performance
The utility model is characterized in that the valve seat sealing ring is composed of a plurality of layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
The sealing surface of the valve plate and the valve seat is an oblique conical structure, and the temperature-resistant and corrosion-resistant alloy material is deposited on the inclined conical surface of the valve plate; the spring fixed between the adjusting ring pressure plate and the adjusting bolt assembly on the pressure plate are assembled. The structure effectively compensates for the tolerance band between the sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve in the two-way interchangeable medium conveying process.
The soft T-shaped multi-layer stainless steel sheet is used to form the sealing ring, which has the double advantages of metal hard seal and soft seal, and has zero leakage sealing performance at low temperature and high temperature. When the test proves that the positive flow state of the tank (the direction of flow of the medium is the same as the direction of rotation of the disc), the pressure of the sealing surface is caused by the action of the torque of the transmission and the pressure of the medium on the valve plate. When the positive medium pressure increases, the tighter surface of the valve plate and the sealing surface of the valve seat are pressed tighter, and the sealing effect is better.
In the countercurrent state, the seal between the valve plate and the valve seat is biased against the drive to press the valve plate against the valve seat. As the pressure of the reverse medium increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the deformation of the spring of the adjusting ring after being loaded can compensate the tight pressure of the sealing surface of the valve plate and the valve seat. Plays an automatic compensation role.
Therefore, the utility model does not install a soft and hard multi-layer sealing ring on the valve plate as in the prior art, but is directly mounted on the valve body, and an adjustment ring is added between the pressure plate and the valve seat, which is an ideal two-way hard sealing method. . It will replace the gate valve and the ball valve.
Characteristics
The main features of the high temperature ball valve are its compact structure, reliable sealing, simple structure and convenient maintenance. The sealing surface and the spherical surface are often closed, not easily eroded by the medium, easy to operate and maintain, suitable for water, solvent, acid and natural gas. Working medium, but also suitable for medium with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, which are widely used in various industries. The ball valve body may be integral or combined.
The high temperature ball valve has a 90 degree rotation action, the cock body is a sphere with a circular through hole or passage through its axis. The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. It only needs to be rotated 90 degrees and the torque can be closed tightly. Ball valves are best suited for use as switching and shut-off valves, but recent developments have designed ball valves to provide throttling and control flow, such as V-ball valves.
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