What are Valve sealing materials?
The sealing material is actually the very critical surface of the valve. The quality of the sealing material is affecting the service life of the valves. The sealing material is actually very important factor in making sure to maintain the quality of the sealing surface
Les joints de vanne sont la partie clé pour déterminer la performance de la vanne. Des facteurs tels que la friction, le flash, la corrosion, l'oxydation, etc., doivent être pris en compte lors de la sélection des matériaux de surface d'étanchéité. Les joints de vanne sont divisés en 2 catégories : l'une est connue sous le nom de joint souple, également appelé caoutchouc, qui comprend le caoutchouc fluoro et le caoutchouc butane. L'autre, la seconde, est le joint dur qui comprend les alliages de cuivre et est utilisé pour les vannes basse pression, les alliages à base de nickel, les alliages satellites et les aciers inoxydables au chrome.
Top 10 valve sealing materials
1. Synthetic rubber
Synthetic rubber is superior to the natural rubber in its temperature, resistance and corrosion resistance. The temperature of synthetic rubber is lower than 150 degree Celsius. Natural rubber is lower than 60 degree Celsius. Rubbers are used for shut off valve, butterfly valve, check valve, pinch valve and other valves whose pressure is smaller than 1 MPa.
2. Nylon
Nylon has the characteristics of good corrosion resistance and small friction coefficient. Nylon is mostly used for globe valves and ball valves with the temperature less than 90 degree Celsius. The nominal pressure is smaller than 32 MPa.
3. Teflon
Teflon is mostly used for the gate valves, shut off valves, ball valves etc. it contains a temperature that is more than 232 degree Celsius and nominal pressure of 6.4 MPa.
4. Cast iron
Cast iron is used for globe valves, gate valves and plug valves for oil transportation and for gas. The temperature is more than 100 degrees Celsius and nominal pressure of 1.6 MPa.
5. Babbitt alloy
Babbitt alloy is used for ammonium shut off valves. The temperature is between t – 70 to t – 50 degrees Celsius and nominal pressure of 2.5 MPa.
6. Copper alloy
Common materials for copper alloys are 6 -6 -3 tin bronze and 58 – 2- 2 manganese brass. Copper alloy has very good wear resistance and it is suitable for steam and water. The use of temperature is more than 200 degrees Celsius and nominal pressure of 1.6 MPa. It is commonly used for plug valves, globe valves, gate valves and check valves etc.
7. Chrome nickel titanium stainless steel
The common grade of Chrome nickel titanium stainless steel is 1 Cr18Ni9ti. It has good corrosion resistance, heat resistance and erosion resistance. It is suitable for mediums such as nitric acid and steam. These are used for ball valves and shut off valves.
8. Boronizing
Boronizing is directly processed by the body of the valve or the material of the valves to the sealing surface. The bronzing surface is treated and the sealing surface has good wear resistance. It is used for power station drain valves.
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