The characteristics and structure of the metal hard-sealed butterfly valve
Addtime：2022-09-26 From： View：458
Introduction:
The butterfly plate of the hard-sealed butterfly valve is installed in the diameter direction of the pipeline. Within the cylindrical channel of the valve body of the hard-sealed butterfly valve, the disc-shaped butterfly plate rotates around the axis, with the rotation angle ranging from 0° to 90°. When it rotates to 90°, the valve is in the fully open state.
Characteristics:
The valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
2. The sealing surfaces of the valve plate and the valve seat adopt a conical-sloping structure. On the conical-sloping surface of the valve plate, a heat-resistant and corrosion-resistant alloy material is welded. The spring fixed between the adjusting ring and the pressure plate and the adjusting bolts on the pressure plate are assembled together. This structure effectively compensates for the tolerance band between the shaft sleeve and the valve body as well as the elastic deformation of the valve stem under the medium pressure, thus solving the sealing problem that exists in the process of bidirectional interchange of medium transportation by the valve.
3. The sealing ring is composed of soft T-shaped multi-layer stainless steel sheets on both sides. It possesses the dual advantages of metal hard sealing and soft sealing. Regardless of low-temperature or high-temperature conditions, it has a zero-leakage sealing performance. Test results show that when the liquid flows in the same direction as the rotation of the butterfly plate (positive flow state), the pressure on the sealing surface is generated by the torque of the transmission device and the pressure of the medium on the valve plate. As the positive medium pressure increases, the squeezing between the inclined conical surface of the valve plate and the sealing surface of the valve seat becomes tighter, resulting in better sealing effect.
4. In the reverse flow state, the sealing between the valve plate and the valve seat is maintained by the torque of the driving device, causing the valve plate to press against the valve seat. As the reverse medium pressure increases, when the unit normal pressure between the valve plate and the valve seat is less than the medium pressure, the deformation energy stored in the spring of the regulating ring after being loaded compensates for the tight pressure between the sealing surfaces of the valve plate and the valve seat, thereby playing an automatic compensation role.
Therefore, this utility model is different from the existing technologies, which do not install multiple layers of soft and hard sealing rings on the valve plate. Instead, it is directly installed on the valve body. Adding a regulating ring between the pressure plate and the valve seat is an ideal two-way hard sealing method.
The butterfly plate of the hard-sealed butterfly valve is installed in the diameter direction of the pipeline. Within the cylindrical channel of the valve body of the hard-sealed butterfly valve, the disc-shaped butterfly plate rotates around the axis, with the rotation angle ranging from 0° to 90°. When it rotates to 90°, the valve is in the fully open state.
Characteristics:
The valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
2. The sealing surfaces of the valve plate and the valve seat adopt a conical-sloping structure. On the conical-sloping surface of the valve plate, a heat-resistant and corrosion-resistant alloy material is welded. The spring fixed between the adjusting ring and the pressure plate and the adjusting bolts on the pressure plate are assembled together. This structure effectively compensates for the tolerance band between the shaft sleeve and the valve body as well as the elastic deformation of the valve stem under the medium pressure, thus solving the sealing problem that exists in the process of bidirectional interchange of medium transportation by the valve.
3. The sealing ring is composed of soft T-shaped multi-layer stainless steel sheets on both sides. It possesses the dual advantages of metal hard sealing and soft sealing. Regardless of low-temperature or high-temperature conditions, it has a zero-leakage sealing performance. Test results show that when the liquid flows in the same direction as the rotation of the butterfly plate (positive flow state), the pressure on the sealing surface is generated by the torque of the transmission device and the pressure of the medium on the valve plate. As the positive medium pressure increases, the squeezing between the inclined conical surface of the valve plate and the sealing surface of the valve seat becomes tighter, resulting in better sealing effect.
4. In the reverse flow state, the sealing between the valve plate and the valve seat is maintained by the torque of the driving device, causing the valve plate to press against the valve seat. As the reverse medium pressure increases, when the unit normal pressure between the valve plate and the valve seat is less than the medium pressure, the deformation energy stored in the spring of the regulating ring after being loaded compensates for the tight pressure between the sealing surfaces of the valve plate and the valve seat, thereby playing an automatic compensation role.
Therefore, this utility model is different from the existing technologies, which do not install multiple layers of soft and hard sealing rings on the valve plate. Instead, it is directly installed on the valve body. Adding a regulating ring between the pressure plate and the valve seat is an ideal two-way hard sealing method.
Structure:
The metal hard-sealed butterfly valve adopts an eccentric metal sealing structure. The sealing method is metal-to-metal sealing. It can be replaced with metal sealing rings for metal sealing, or with stainless steel plates and graphite composite plates sealing rings for metal sealing. The driving forms of the metal hard-sealed butterfly valve, apart from electric, also include: manual, worm gear rod transmission, pneumatic, etc.