MSS SP-80 Check Valves | McMaster-Carr

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76 Products

High-Flow Threaded Check Valves

To achieve the maximum possible flow, internal components are designed to reduce flow resistance. These valves open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.

Bronze Body


	Repair Kit for 125 Pressure Class	Repair Kit for 200 and 300 Pressure Classes

Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

Repair Kits—Repair kits include everything you need to rebuild the valve.

	Check Valves															Repair Kits
	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Disc Material	Seal Material		Each	For Pressure Class	For Pipe Size		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class 125



		1/4	3.3	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	2 1/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K51	000000	125	1/4	4708K25	000000


		3/8	6	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	2 1/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K52	00000	125	3/8	4708K31	00000
		1/2	10	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	2 5/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K53	00000	125	1/2	4708K24	00000
		3/4	18	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	2 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K54	00000	125	3/4	4708K29	00000
		1	31	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	3 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K55	000000	125	1	4708K21	00000
		1 1/4	54	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	3 9/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K56	000000	125	1 1/4	4708K23	00000
		1 1/2	76	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K57	000000	125	1 1/2	4708K22	000000
		2	131	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	4 3/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4708K58	000000	125	2	4708K26	000000
		2 1/2	192	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	6"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4708K59	000000	125	2 1/2	4708K27	000000
		3	297	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	6 7/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4708K61	000000	125	3	4708K28	000000


		NPT Female Inlet × NPT Female Outlet—Pressure Class 150



				1/4	2.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K51	00000	—	—	———	0


				3/8	4.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K52	00000	—	—	———	0
				1/2	7.2	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	2 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K53	00000	—	—	———	0
				3/4	13	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	3"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K54	000000	—	—	———	0
				1	22	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K55	000000	—	—	———	0
				1 1/4	39	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	4 3/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K56	000000	—	—	———	0
				1 1/2	56	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	4 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K57	000000	—	—	———	0
				2	92	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	5 7/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K58	000000	—	—	———	0
				2 1/2	150	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	7"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K59	000000	—	—	———	0
				3	240	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	7 7/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K61	00000000	—	—	———	0


				NPT Female Inlet × NPT Female Outlet—Pressure Class 200



						1/4	2.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K61	000000	200, 300	1/4	9770K115	00000


						3/8	4.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K62	000000	200, 300	3/8	9770K121	00000
						1/2	7.2	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	2 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K63	000000	200, 300	1/2	9770K114	00000
						3/4	13	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	3"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K64	000000	200, 300	3/4	9770K119	00000
						1	22	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K65	000000	200, 300	1	9770K111	00000
						1 1/4	39	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	4 3/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K66	000000	200, 300	1 1/4	9770K113	000000
						1 1/2	56	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	4 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K67	000000	200, 300	1 1/2	9770K112	000000
						2	92	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	5 7/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K68	000000	200, 300	2	9770K116	000000
						2 1/2	150	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	7"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K69	00000000	200, 300	2 1/2	9770K117	000000


						NPT Female Inlet × NPT Female Outlet—Pressure Class 300



								1/4	2.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K71	000000	200, 300	1/4	9770K115	00000


								3/8	4.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K72	000000	200, 300	3/8	9770K121	00000
								1/2	7.2	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	2 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K73	000000	200, 300	1/2	9770K114	00000
								3/4	13	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	3"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K74	000000	200, 300	3/4	9770K119	00000
								1	22	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K75	000000	200, 300	1	9770K111	00000
								1 1/4	39	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	4 3/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K76	000000	200, 300	1 1/4	9770K113	000000
1 1/2								56	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	4 5/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K77	000000	200, 300	1 1/2	9770K112	000000
2	92							600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	5 7/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K78	000000	200, 300	2	9770K116	000000
2 1/2	150							600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	7"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K79	00000000	200, 300	2 1/2	9770K117	000000

High-Cycling Threaded Check Valves

With few moving parts to wear out, these valves withstand frequent opening and closing, pulsating flow, and rapid flow reversal. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.

Bronze Body

Image of Product. Front orientation. Check Valves. High-Cycling Threaded Check Valves.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Disc Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class 125



	1/2	2.87	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	2 3/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Brass	4894K47	0000000


	3/4	5.24	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	2 1/2"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K12	000000
	1	8.86	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	3 1/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K13	000000
	1 1/4	15.67	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	3 5/8"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K14	000000
	1 1/2	21.83	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	3 7/8"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K15	000000
	2	37.84	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	4 11/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K16	000000


	NPT Female Inlet × NPT Female Outlet—Pressure Class 300



			1/2	2.87	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	2 9/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K81	000000


			3/4	5.24	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	3"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K82	000000
			1	8.86	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	3 1/2"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K83	000000
			1 1/4	15.67	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	4 1/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K84	000000
			1 1/2	21.83	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	4 5/8"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K85	000000
			2	37.84	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	5 3/4"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K86	000000

Check Valves with Solder-Socket Fittings

Solder these valves to copper tubing for a permanent, leak-tight connection. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.

Bronze Body

Image of Product. Front orientation. Check Valves. Check Valves with Solder-Socket Fittings.

	For Tube OD	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Disc Material	Seal Material		Each
Solder Socket × Solder Socket—Pressure Class 125



	1/4	3/8"	1.3	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	2 1/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K12	000000


	3/8	1/2"	2.5	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	2 1/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K14	00000
	1/2	5/8"	4.8	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	2 9/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K16	000000
	3/4	7/8"	14.3	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	3 3/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K18	000000
	1	1 1/8"	24	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	4 1/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K22	000000
	1 1/2	1 5/8"	60	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	5 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K26	000000
	2	2 1/8"	102	200 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	6 3/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Steam, Water	Bronze	Bronze	9782K28	000000