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Metal Seated Ball Valves

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Typical Seats Constructions And Materials

Standard Seat

NPS: DN1/2"~11/2"
Ball seat: Stainless steel+hard facing
Seat seal: R-PTFE
Temp range: -50°C ~+250°C/-58°F~+482°F

High temperture seat-1

NPS: DN1"~8" ball valves
Ball seat: Stainless steel+hard facing
Seat seal: Graphite
Spring: INCONEL X-750
Temp range: -200°C ~+550°C/-58°F~+1022°F

Locked seat

NPS: DN1/2"~11/2"
Ball seat: Stainless steel+hard facing
Seat seal: R-PTFE
Temp range: -50°C ~+250°C/-58°F~+482°F

High temperture seat-2

NPS: DN1"~8" ball valves
Ball seat: Stainless steel+hard facing
Seat seal: Graphite
Spring: INCONEL X-750
Temp range: -50°C ~+550°C/-58°F~+1022°F

Applications of metal seated ball valve

Type	Size	Temperature Range	Auxiliary Seal	Ball/Seats Seal	Working Condition
Floating Ball Valve	Pressure Range 150, 300, 600 NPS 1/2"~8"	-50°C~250°C	R-PTFE	Ball: nitriding or Nickel base/Co base alloy overlay Seat: Stellited	1.finishing mixture 2.solidcontaining fluids 3.hight temperature and hight pressure
		-50°C~380°C	Graphite
		-35°C~550°C	Graphite	Ball: Nickel Base/Co basealloy overlay Seat: Steallited

PSN Metal Seated Ball Valves

Material speciation

Part	Carbon Steel		Stainless Steel
Temp. Range	-29°C~250°C	250°C~425°C	-29°C~250°C	250°C~550°C
Body	ASTM A216 WCB		ASTM A351 CF8M
ball	ASTM A182 F304/coating		ASTM A 182 F316/coating
Stem	ASTM A182 F6a		ASTM A182 F316
Seat	ASTM A182 F316/Stellite Overly		ASTM A182 F316/Stellite Overly
Gasket	Reinforced PTFE	Graphite+304S.S.	Reinforced PTFE	Graphite+316S.S.
Gland Packing	Reinforced PTFE	Graphite+304S.S.	Reinforced PTFE	Graphite+316S.S.
Stem Bearing	Reinforced PTFE	Graphite+304S.S.	Reinforced PTFE	Graphite+316S.S.
Spring	17-7PH	Inconel X-750	316Stainless Steel	Inconel X-750
Bolt	ASTM A193 B7		ASTM A193 B8M
Nut	ASTM A194 2H		ASTM A194 8M
Seat Seal Gasket	Graphite+304S.S.		Graphite+316S.S.

Valve Design Operating Torques (N-m)

Size (in)	150lb	300lb	600lb
1/2	52	79	103
3/4	58	105	150
1	65	155	202
1-1/2	91	220	285
2	115	230	-
2-1/2	224	350	-
3	260	370	-
4	380	610	-
5	620	980	-
6	1400	2300	-
8	2600	4500	-

All torque valves show on chart are "wet" (water and other nonlubricating media) on-off service. For "dry" service, multiply values by 1.3. For "lubed" service, multiply values by 0.95.

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