Among the well-known butterfly valve technology, the well-known domestic manufacturer has Yongjia Tezhong Valve Co., Ltd. Its company is a designated management enterprise of the Ministry of Machinery Industry, the Ministry of Chemical Industry and China National Chemical Equipment Corporation. Its products have certain price advantages and technical advantages in the industry. The sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene, and 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 sealing surface layer of the valve seat is welded with a temperature-resistant and corrosion-resistant alloy material. The multi-layer soft stack sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, the butterfly valve has high temperature resistance, light operation, no friction in opening and closing, and the seal is compensated with the increase of the torque of the transmission mechanism when closing, and the butterfly valve is improved. The sealing performance and the advantage of extending the service life.
However, this butterfly valve still has the following problems 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 frontal flush on the sealing surface thereof, and the soft sealing band in the metal sheet interlayer is directly washed, which directly affects the sealing performance.
Second, subject to structural constraints 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.
3. Due to the principle of the three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the seal extrusion. When the flow medium is reversed, the unit positive pressure between the valve plate and the valve seat is smaller than the medium pressure as the medium pressure increases, and the seal begins to leak. The characteristics of the new high-life stainless steel butterfly valve and the problems in the use of the butterfly valve
At present, Zhejiang Butterfly Valve has been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower as a component used to realize the on-off and flow control of pipeline systems.
Reprinted: Yongjia Tezhong Valve Co., Ltd. specializes in the production of metal hard seal butterfly valves, three eccentric butterfly valves, ventilation butterfly valves, flange butterfly valves and other products, the company website address:
Hex Head Self Tapping Drywall Screws White Zinc Drywall Screw With Rubber Bonded Washer
hex head self drilling roof screw with rubber washer
Finish:
Hex Washer Head Self Tapping Screw,Hex Washer Head Screw,Hex Washer Self Drilling Screw,Hex Washer Head
Handan Jiankun Hardware Products Co., Ltd , https://www.jkscrew.com