Commonly used valve sealing surfaces or lining materials and their use conditions

- May 24, 2018-

Sealing ring material has two major categories of metal and non-metal

The commonly used valve seal material and its use conditions are as follows:


1, PTFE, code F

PTFE is mostly used for globe valves, gate valves, ball valves, etc. with temperature t≤232°C and nominal pressure PN≤6.4MPa.

2, synthetic rubber, code X

Synthetic rubber is superior to natural rubber in terms of oil, temperature, and corrosion resistance. General synthetic rubber use temperature t ≤ 150 °C, natural rubber t ≤ 60 °C, rubber for nominal pressure PN ≤ 1MPa of the cut-off valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and other valves sealed.

3, nylon, code N

Nylon has the characteristics of small friction coefficient and good corrosion resistance. Nylon is mostly used for ball valves and globe valves with temperature t≤90°C and nominal pressure PN≤32MPa.


4, Babbitt, code B

The BF alloy is used for ammonia shut-off valves with temperature t-70~150°C and nominal pressure PN≤2.5MPa.

5, chromium stainless steel, code H

Chromium stainless steel commonly used grades 2Cr13, 3Cr13 after conditioning, corrosion resistance is good. It is commonly used in valves with medium temperature t≤450°C and nominal pressure PN≤32MPa for water, steam and oil.

6, chromium nickel titanium stainless steel, code R

Chromium nickel titanium stainless steel commonly used trademark 1Cr18Ni9ti, its corrosion resistance, erosion resistance and heat resistance better. Applicable to the temperature t ≤ 600 °C, nominal pressure PN ≤ 6.4MPa steam, nitric acid and other media, for the cut-off valve, ball valve and so on.

7, copper alloy, code T

The commonly used copper alloy materials include 6-6-3 tin bronze and 58-2-2 manganese brass. Copper alloy wear resistance is good, suitable for temperature t ≤ 200 °C, nominal pressure PN ≤ 1.6MPa of water and steam, often used in gate valves, globe valves, check valves, plug valves.

10, boronized steel, code P

Boronizing steel is directly processed by the valve body or the valve body material to seal the surface, and then the boronizing surface treatment.