Characteristics and structure of metal hard seal butterfly valve

The butterfly plate of the hard seal butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the hard seal butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0 ° and 90 °. When the valve is rotated to 90 °, the valve is fully open.

The characteristics of the new high-life stainless steel butterfly valve and the problems in the use of the butterfly valve:

Hard seal butterfly valve, hard seal butterfly valve as a pipe system used to achieve on-off and flow control components, has been in the petroleum, chemical, metallurgy, hydropower and many other fields have been extremely widely used. In the known butterfly valve technology, the sealing structure is mostly used in the form of sealing, and the sealing material is rubber, polytetrafluoroethylene, etc. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively good existing butterfly valve is a three-eccentric metal hard seal butterfly valve, valve body and valve seat for the conjoined components, valve seat sealing surface layer surfacing temperature-resistant, corrosion-resistant alloy materials. Multi-layer soft stacked seal ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has high temperature resistance, easy operation, and no friction in opening and closing. When closing, the torque of the transmission mechanism increases to compensate for the seal, which improves The sealing performance of the butterfly valve and the advantages of extending its service life.

Features:

1. The valve seat sealing ring is composed of multi-layer stainless steel sheets on both sides of the soft T-shaped sealing ring.

2. The sealing surface of the valve plate and the valve seat is of an inclined conical structure, and the inclined conical surface of the valve plate is overlaid with temperature-resistant and corrosion-resistant alloy materials. The spring fixed between the adjusting ring pressure plate and the adjusting bolt on the pressure plate are assembled together. This structure effectively compensates the tolerance zone between the sleeve and the valve body and the elastic deformation of the valve stem under the pressure of the medium, and solves the sealing problem of the valve in the process of two-way exchange of the medium.

3, the use of soft T-shaped on both sides of the multi-layer stainless steel sheet to form a sealing ring, with the dual advantages of metal hard seal and soft seal, both in low temperature and high temperature conditions, have zero leakage sealing performance. The test proves that when the pool is in a positive flow state (the direction of the medium flow is the same as the direction of rotation of the butterfly plate), the pressure on the sealing surface is generated by the torque of the transmission device and the action of the medium pressure on the valve plate. When the positive medium pressure increases, the inclined conical surface of the valve plate and the sealing surface of the valve seat are squeezed more tightly, and the sealing effect is better.

4, when the reverse state, the valve plate and the seal between the valve seat by the torque of the drive device to make the valve plate pressure to the valve seat. With the increase of the pressure of the reverse medium, the unit positive pressure between the valve plate and the valve seat is less than the pressure of the medium, the deformation of the spring of the regulating ring after being loaded can compensate the tight pressure of the valve plate and the valve seat sealing surface to play an automatic compensation role.

Therefore, unlike the existing technology, the utility model is not installed on the valve plate soft and hard multi-layer sealing ring, but directly installed on the valve body, in the middle of the pressure plate and valve seat to add the adjustment ring is a very ideal two-way hard seal.

Structure:

Metal hard seal butterfly valve for eccentric metal sealing structure, sealing form can be divided into: metal to metal seal, replaceable metal sealing ring to metal seal, stainless steel plate and graphite composite plate sealing ring to metal seal. Hard seal butterfly valve drive in addition to the form of electric and manual, worm gear drive, pneumatic and so on. This type of valve in the pipeline should generally be installed horizontally.