A blade is a part of a tool, weapon, or machine whose edge is designed to pierce, cut, or scratch the surface of a material. Blades can be made of materials such as flint, metal (usually steel), ceramics or other materials. Blade is one of the oldest tools of human beings, and has been used for combat, food preparation and other purposes.
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Safety valve is the most widely used pressure vessel, pressure pipe safety device. In marine power plant seawater system, in order to prevent the system pressure exceeds the allowable limit, to ensure the safe operation of the system, set the spring direct-acting safety valve. During use, these safety valves have leaks, corrosion and reliability issues, can not meet the requirements, so it has been improved. Marine seawater safety valve body material generally used ZCu16Si14 â… or ZCuAl10Fe3, these materials in the actual use of environmental conditions, the ability of anti-corrosion relatively poor. When the valve surface contact bilge water and sewage and other impurities in the media, vulnerable to corrosion. However, the setting value of the spring direct-acting safety valve and the back seat pressure adjustment are inconvenient. When the back seat pressure is lower than the normal working pressure of the system, the reliability and safety of the system work are adversely affected. According to the valve problems, to determine the valve material and structure to improve: (1) the valve body material due to the selection of the safety valve body cast copper alloy corrosion resistance is poor, causing the media along the sealing boundary leakage. Therefore, all parts of the safety valve (except shims, fasteners and springs) were replaced with HDR (a duplex stainless steel). HDR is excellent in resistance to chloride ion corrosion and stress corrosion, and has good resistance to seawater erosion and corrosion (the flow velocity of the pipe is up to 7m / s or more) and strong sand erosion resistance, and its comprehensive welding, cold bending and other comprehensive processing Performance is the material of choice for ship seawater piping systems. (2) sealing surface material In order to improve the sealing performance of the valve, the valve flap and valve seat sealing surface are used by welding cobalt-based hard alloy way. So that the sealing surface has sufficient rigidity and strength, when there is no medium pressure in the system, can withstand the huge pressure generated by the spring. And cobalt-based carbide has good mechanical properties and grinding and grinding properties. And the ability of elastic deformation is better, can withstand the impact of the flap back seat. (3) Spring Materials The spring of seawater safety valve needs to meet the requirements of stability, strength and resistance to seawater corrosion. Therefore, In2conel is selected as the spring material of the micro-safety valve for seawater medium when improving the design. In the production of spring, through the aging treatment and pressure treatment, it has a stable elasticity and strength, to ensure the safety valve action repeatability.