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With this article, the valve no longer leaks
butterfly valve,jktl butterfly valve
The valve sealing performance requirements, to prevent the leak angle starting. According to the different parts and extent of its leakage, resulting in different leakage of the valve, therefore, need to put forward different leakage measures.The following is the use of various types of sealing materials, as well as the commonly used valve type

1, Synthetic rubber

Synthetic rubber oil, temperature, corrosion resistance and other comprehensive performance is better than natural rubber. General rubber used temperature t ≤ 150 ℃, natural rubber t ≤ 60 ℃, rubber used for nominal pressure PN ≤ 1MPa cut valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and other valves sealed.

2, Nylon

Nylon has a small coefficient of friction, good corrosion resistance and so on. Nylon used for the temperature t ≤ 90 ℃, nominal pressure PN ≤ 32MPa ball valve, globe valve.

3, Polytetrafluoroethylene

Polytetrafluoroethylene used for the temperature t ≤ 232 ℃, nominal pressure PN ≤ 6.4MPa cut-off valve, gate valve, ball valve.

4, Cast iron

Cast iron for the temperature t ≤ 100 ℃, the nominal pressure PN ≤ 1.6MPa, gas and oil with the gate valve, globe valve, plug valve.

5, Babbitt

Pasteurized alloy for the temperature t-70 ~ 150 ℃, the nominal pressure PN ≤ 2.5MPa ammonia with cut-off valve.

6, copper alloy

Copper alloy commonly used materials are 6-6-3 tin bronze and 58-2-2 manganese brass and so on. 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 and so on.

7, Chrome stainless steel

Chromium stainless steel commonly used brands have 2Cr13, 3Cr13 quenched and tempered, good corrosion resistance. Commonly used in the temperature t ≤ 450 ℃, the nominal pressure PN ≤ 32MPa water, steam and oil and other media on the valve.

8, Chromium nickel titanium stainless steel

Chromium nickel-titanium stainless steel commonly used grade 1Cr18Ni9ti, its corrosion resistance, corrosion resistance and heat resistance is better. Applicable to the temperature t ≤ 600 ℃, the nominal pressure PN ≤ 6.4MPa steam, nitric acid and other media, for the valve, ball valve.

9, Nitriding steel

Nitriding steel commonly used grade is 38CrMoAlA, carburizing treatment, with good corrosion resistance and scratch resistance. Commonly used in the temperature t ≤ 540 ℃, the nominal pressure PN ≤ 10MPa power station gate valve.

10, Boronizing

Boron boron by the valve body or valve body material directly processed out of the sealing surface, and then boron surface treatment, sealing surface wear resistance is very good. Used for power station sewage valve.