Views: 0 Author: J-VALVES Publish Time: 2024-10-29 Origin: Site
Metal sealing and elastic sealing
The sealing of flange gate valve mainly relies on two methods: metal sealing and elastic sealing. Metal sealing is achieved by the tight fit between the valve plate and the valve seat, and is usually suitable for high temperature and high pressure working conditions. This sealing method requires the valve plate and valve seat to have high-precision machined surfaces to ensure the reliability of sealing. Elastic sealing is achieved by adding elastic materials (such as graphite, rubber, etc.) between the valve seat and the valve plate. It is suitable for medium and low pressure working conditions and has good sealing performance and certain adaptive ability.
Optimization of sealing surface material
Selecting appropriate sealing surface material is an important means to improve sealing performance. For high-temperature and high-pressure working conditions, hard alloy or ceramic materials can be used. These materials have high hardness, high wear resistance and good corrosion resistance. For medium and low pressure working conditions, stainless steel or copper alloy materials can be used, and special treatment such as spray welding and hard chromium plating can be carried out on the surface to improve the wear resistance and corrosion resistance of the sealing surface.
Improvement of sealing surface machining accuracy
High-precision sealing surface machining is the basis for ensuring sealing performance. By adopting advanced numerical control machining technology and precision measuring equipment, the surface finish and flatness of the valve plate and valve seat can be improved, and the microscopic unevenness of the sealing surface can be reduced, thereby improving the sealing performance.
Optimization of stem seal
The optimal design of stem seal can start from packing material and structure. Adopting high-performance self-lubricating packing, such as polytetrafluoroethylene (PTFE) or graphite packing, can reduce the friction between the packing and the stem and extend the service life of the packing. At the same time, designing a reasonable stuffing box structure, such as adding an elastic sealing ring and a compression device, can improve the reliability and adjustment flexibility of the stem seal.
