Due to the multi-layer soft and hard laminated sealing ring being fixed on the valve plate, when the valve plate is normally open, the medium will form a positive flushing on its sealing surface, and the soft sealing tape in the metal sheet interlayer will directly flush and affect the sealing performance.
Due to structural limitations, this structure is not suitable for valves below DN200 because the overall structure of the valve plate is too thick and has high flow resistance.
Due to the principle of rubber lined butterfly valves, the sealing between the valve plate sealing surface and the valve seat is achieved by the torque of the transmission device pressing against the valve seat. Under normal flow conditions, the higher the medium pressure, the tighter the sealing compression. When the medium in the channel flows back, with the increase of medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak.
The high-performance fluorine lined butterfly valve is characterized by a valve seat sealing ring composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
The sealing surface between the valve plate and the valve seat is a slanted cone structure, and the slanted cone surface of the valve plate is covered with temperature resistant and corrosion-resistant alloy materials; The spring fixed between the adjustment ring pressure plate and the adjustment bolt on the pressure plate are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body, as well as the elastic deformation of the valve stem under medium pressure, solving the sealing problem of the valve during bidirectional interchangeable medium transportation.
The sealing ring is formed by using soft T-shaped multi-layer stainless steel sheets on both sides, which has the dual advantages of metal hard sealing and soft sealing. Has zero leakage sealing performance at low and high temperatures. The experiment shows that the pressure on the sealing surface is caused by the torque of the transmission device and the influence of the medium pressure on the valve plate under the normal flow state of the water tank [the direction of medium flow is the same as the direction of rotation]. Butterfly board direction. When the positive pressure of the medium increases, the compression between the inclined conical surface of the valve plate and the sealing surface of the valve seat becomes tighter, and the sealing effect becomes better.
In the reverse flow state, the seal between the valve plate and the valve seat is pressed against the valve seat by the torque of the driving device. As the reverse medium pressure increases, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation stored by the regulating ring spring after loading can compensate for the tight pressure of the seal. The surface of the valve plate and valve seat plays an automatic compensation role.
Therefore, the present utility model no longer installs soft and hard multi-layer sealing rings on the valve plate as in the prior art, but directly installs them on the valve body. Installing an adjusting ring between the pressure plate and the valve seat is an ideal bi-directional hard sealing method. It will replace gate valves and ball valves.
The analysis of the problems in the use of fluorine lined butterfly valves is as follows:
Due to the multi-layer soft and hard laminated sealing ring being fixed on the valve plate, when the valve plate is normally open, the medium will form a positive flushing on its sealing surface, and the soft sealing tape in the metal sheet interlayer will directly flush and affect the sealing performance.
Due to structural limitations, this structure is not suitable for valves below DN200 because the overall structure of the valve plate is too thick and has high flow resistance.
Due to the principle of rubber lined butterfly valves, the sealing between the valve plate sealing surface and the valve seat is achieved by the torque of the transmission device pressing against the valve seat. Under normal flow conditions, the higher the medium pressure, the tighter the sealing compression. When the medium in the channel flows back, with the increase of medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak.
The high-performance fluorine lined butterfly valve is characterized by a valve seat sealing ring composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
The sealing surface between the valve plate and the valve seat is a slanted cone structure, and the slanted cone surface of the valve plate is covered with temperature resistant and corrosion-resistant alloy materials; The spring fixed between the adjustment ring pressure plate and the adjustment bolt on the pressure plate are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body, as well as the elastic deformation of the valve stem under medium pressure, solving the sealing problem of the valve during bidirectional interchangeable medium transportation.
The sealing ring is formed by using soft T-shaped multi-layer stainless steel sheets on both sides, which has the dual advantages of metal hard sealing and soft sealing. Has zero leakage sealing performance at low and high temperatures. The experiment shows that the pressure on the sealing surface is caused by the torque of the transmission device and the influence of the medium pressure on the valve plate under the normal flow state of the water tank [the direction of medium flow is the same as the direction of rotation]. Butterfly board direction. When the positive pressure of the medium increases, the compression between the inclined conical surface of the valve plate and the sealing surface of the valve seat becomes tighter, and the sealing effect becomes better.
In the reverse flow state, the seal between the valve plate and the valve seat is pressed against the valve seat by the torque of the driving device. As the reverse medium pressure increases, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation stored by the regulating ring spring after loading can compensate for the tight pressure of the seal. The surface of the valve plate and valve seat plays an automatic compensation role.
Therefore, the present utility model no longer installs soft and hard multi-layer sealing rings on the valve plate as in the prior art, but directly installs them on the valve body. Installing an adjusting ring between the pressure plate and the valve seat is an ideal bi-directional hard sealing method. It will replace gate valves and ball valves.