Structural features and workflow of stainless steel high temperature ball valve
The stainless steel high temperature ball valve is a metal sealing structure, the sealing form is metal to metal sealing, the metal sealing ring can be replaced by metal sealing, the stainless steel plate and the graphite composite plate sealing ring are metal sealing. The driving form of the hard sealing butterfly valve is manual except the electric motor. , worm wheel drive, pneumatic and so on. 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. 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. Test proves that the pool is in a positive flow state (media flow direction)
When the direction of rotation of the disc is the same, the pressure of the sealing surface is caused by the torque of the transmission and the effect of the medium pressure 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. When countercurrent
In the state, the seal between the valve plate and the valve seat * the torque of the drive device presses 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.
High-temperature ball valves for stainless steel high-temperature ball valves have been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower. 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 valve seat sealing surface layer
Surfacing welding temperature and corrosion resistant alloy materials. The multi-layer soft-stacked 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 torque is increased to compensate for the seal, which improves the sealing.
The sealing performance of the butterfly valve and the advantages of extending the service life.
Procedures that should be noted during use:
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.
Third, due to the principle of the three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is the torque of the transmission device to press the valve plate against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal extrusion. As the flow medium is reversed, the pressure increases with the medium.
When the unit positive pressure between the large valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
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