metal material valve to say into mechanical equipment in the very important parts structure easy to erosion is invalid. In general, the metal material of condyle surface, valve seat, pulse dampers, the small spring all sorts of valve general use of raw materials, such as circuit board, valve cover, such as secondary or tertiary available raw materials, to high pressure, toxic, flammable, flammable and explosive, radioactive material valve, raw material, the use of the corrosion is not big.

metal material valve in multifarious work such as air or water solution under the standard not only moments of the metal surface of symmetrical erosion, in some parts of the metal material is also very susceptible to pitting corrosion, ductile fracture, stress corrosion and erosion corrosion, intergranular corrosion, fatigue, can be selectively etching, erosion and cavitation erosion damage part such as hydrogen, the erosion of the vibration and cavitation erosion.

valve anti-corrosion measures

1. Choose nonmetal material

non-metallic materials, corrosion resistance, if work temperature and pressure valve application accord with the provisions of the nonmetal material, not only can deal with erosion problem, and can save precious metals. Oil circuit board, valve cover, valve lining, tu non-metallic materials produced, such as common for gasket, filling material made key die nonmetallic material. Ptfe with isopropyl titanate, methyl acrylate, such as plastic, and the use of natural rubber, neoprene, nitrile rubber, such as valve of vulcanized rubber lining, and oil circuit board, cover behavior main body is cast iron, carbon steel in general. To ensure that the compressive strength of the valve, and ensure that the valve is not subject to erosion.

clip pipe valve is based on the corrosion performance of vulcanized rubber and variable features and design. Now more and more of ptfe with polyester, such as plastic, the use of natural rubber and styrene butadiene rubber in all kinds of noodles, sealing ring, for all kinds of valves, such as a sudden the nonmetallic material, not only good corrosion resistance, and good sealing performance, especially suitable for application in belt particulate matter. Naturally, the compressive strength and low temperature resistance, using the category of restricted. Soft the emergence of high purity graphite, non-metallic materials into the industry of high temperature, solves the long-lasting problem too filling material and seal leakage problem, and is a very good high temperature lubricant.

2。 Metal surface solution

valve thru

common hot dip galvanized, stainless steel valve connecting bolt, air oxidation ( Blue) Solve improve erosion resistance to air, the material the ability to work. Mentioned in other standard parts in addition to choose way, also based on the condition of choosing phosphating and other metal surface treatment.

turn off of surface and its specification is not big, often choose high frequency quenching, boronizing and surface processing technology, improve its corrosion resistance and wear resistance. Made 38 crmoala piston Industrial Valves, high frequency quenching layer & ge; 0. 4mm.

the seat anti-corrosion generally choose high frequency quenching, boronizing, stainless steel, nickel plating, such as surface treatment technology, improve its corrosion resistance, corrosion resistance and wear abrasion resistant properties. Different amount of metal surface treatment shall be suitable for different seat material and office environment, in the air, the water vapor material and asbestos packing material touch the seat, can choose hard chrome plating, gas nitriding process ( Stainless steel plate is not suitable for select ion nitriding process) ;

choose in hydrogen chloride environment in the air valve electroplater 'ecomax' phosphorus nickel coating has a good protective properties; 38 crmoala selects the positive ion and gas nitriding can also be corrosion resistant, but not for choose hard chromium coating; 2 cr13 after heat treatment, erosion resistant to no2 with gas nitriding carbon steel can be resistance to erosion of ammonia, and total phosphorus nickel coating is not ammonia etching resistance; After 38 crmoala raw material gas nitriding with corrosion resistance and comprehensive ability, use it to make the seat.

diameter of oil plate and the handle is also often stainless steel solution, improve its corrosion resistance, decoration design valve.

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