Ball Valve Seat, Seal, Gasket Material Specifications

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Seat, seal, and gasket material selection guide for ball valves, including application fluid, temperature range, and pressure range, etc. The seat is called seat insert in trunnion ball valves, while it is called seat ring in floating ball valves.

 

Soft Seat Material

  Tensile
Strength
(MPa)
Compre
-ssive
Strength
(MPa)
Elonga
-tion
(%)
Hard
-ness
(SH.A)
Water
Absorp
-tion (%)
Specific
Gravity
(G/cm3)
Temprature
Range (°F)
Pressure
Rating
(Class)
Service Application
PTFE 24.8 35 250 56 <0.01 2.2 -300~400 150~600 Chemical, Cryogenic
RPTFE 25.4 52 120 60 <0.01 2.2 -150~425 150~600 Chemical, Cryogenic
Molon 75~100 100~140 10~30 78 0.7 1.2 -40~300 150~1500 High Pressure,
Low Temperature
PEEK 91 137 50 82 012 1.35 -150~500 150~2500 High Pressure,
High Temperature
Nylon 1010 55 70 150 70 0.3 1.04 -40~200 600~1500 High Pressure,
Low Temperature
Nylon 12 60 79 200 75 0.2 1.01 -58~250 600~1500 High Pressure,
Low Temperature
Devlon V 80 140 5.37 78 0.1 1.14 -150~300 150~1500 High Pressure,
Low Temperature
Delrin 68 110 220 78 0.2 1.41 -58~230 150~1500 High Pressure,
Low Temperature

 

Metal Seat Material

  Coating Method Hardness (HRc) Suitable Temperature Application
Stellite 6 HVOF & Fused 37-42 815℃ - Liquid + Gaseous media with partially entrained
 particles / solids (moderate operating cycle)
- Excellent wear resistance / good corrosion resistance
- Wide temperature range
Tunsten Carbide HVOF 69-72 427℃ - Liquid + Gaseous media with partially entrained
 particles / solids (high operating cycles)
- Excellent abrasion resistance / good corrosion resistance
Hard Nickel Alloy HVOF & Fused 58-62 500℃ - Liquid + Gaseous media with partially entrained
 particles / solids (high operating cycles)
- Excellent abrasion resistanc

Note:
1. HVOF- High velocity oxygen fuel coatingis a cutting edge fully automated coating technology which gives uniform layer of coating over the trim parts.
2. The above is the seat selection guid for metal seated ball valves.

 

Seal Material

  Temperature (°F) Hardness (SH.A) Specific Gravity (G/Cm3) Service Application
Viton A -20~400 70 1.85 Petroleum Oils, Gasoline, Transmission Fluid
NBR -50~250 70 1.2 Petroleum Oils, Water, Hydraulic Oils
Viton B -20~400 70 1.85 Mineral Acid, Steam, MTBE
HNBR (HSN) -40~320 80 1.33 Petroleum Oils, H2S & CO2, Anti-Explosive Decompression
Viton AED -20~480 90 1.9 Petroleum Oils, H2S & CO2, Anti-Explosive Decompression
Graphite -300~900     High Temperature

Note: the seal material is for the seat seal and stem seal. 

Gasket Material

  Temperature (°F) PH Service Application
Flexible Graphite -300~900 0~14 Fire Safe
Spiral Would 316+Graphite -300~900 0~14 Fire Safe
PTFE -300~400 0~14 Cryogenic, High Corrosive
Spiral Would Monel+PTFE -300~400 0~14 High Corrosive

Note: The gasket is between body and bonnet.

 

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