Ball Valve Seat, Seal, Gasket Material Specifications

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