Valve seals commonly used materials and conditions of use

Valve sealing material is a metal and non-metallic two categories. Common materials and their conditions are as follows: 1, synthetic rubber, oil, temperature, corrosion resistance and other comprehensive performance superior to natural rubber. General synthetic rubber temperature t ≤ 150 ℃, natural rubber t ≤ 60 ℃, rubber for nominal pressure PN ≤ 1MPa globe valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and other valves sealed. 2, nylon nylon has a small friction coefficient, good corrosion resistance and other characteristics. Nylon used for temperature t ≤ 90 ℃, nominal pressure PN ≤ 32MPa ball valve, globe valve and so on. 3, PTFE Teflon and more for temperature t ≤ 232 ℃, nominal pressure PN ≤ 6.4MPa of the globe valve, valve, ball valve. 4, cast iron cast iron for temperature t ≤ 100 ℃, nominal pressure PN ≤ 1.6MPa, gas and oil gate valve, globe valve, plug valves. 5, Babbitt alloy Babbitt alloy for temperature t -70 ~ 150 ℃, Nominal pressure PN ≤ 2.5MPa ammonia valve. 6, copper alloy copper alloy commonly used materials are 6-6-3 tin bronze and 58-2-2 manganese brass. Copper alloy wear resistance, suitable for temperature t ≤ 200 ℃, nominal pressure PN ≤ 1.6MPa of water and steam, commonly used in gate valves, globe valves, check valves, plug valves. 7, chrome stainless steel chrome stainless steel commonly used grades 2Cr13, 3Cr13 quenched and tempered, corrosion resistance is good. Commonly used in the temperature t ≤ 450 ℃, nominal pressure PN ≤ 32MPa of water, steam and oil and other media on the valve. 8, chrome nickel titanium stainless steel chrome nickel titanium stainless steel commonly used grades 1Cr18Ni9ti, its corrosion resistance, erosion resistance and heat resistance better. For temperature t ≤ 600 ℃, nominal pressure PN ≤ 6.4MPa of steam, nitric acid and other media, used for globe valves, ball valves and so on. 9, nitriding steel nitriding steel commonly used grades is 38CrMoAlA, carburized, has good corrosion resistance and scratch resistance. Commonly used in the temperature t ≤ 540 ℃, nominal pressure PN ≤ 10MPa power station gate valve. 10, Boron infiltration Boron by the valve body or valve body material directly processed sealing surface, and then boronizing surface treatment, sealing surface wear resistance well. For power plant sewage valve.