MSS SP-80 Check Valves | McMaster-Carr

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76 Products

About Backflow-Prevention Valves

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.

Repair kits include everything you need to rebuild the valve.

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.

For technical drawings and 3-D models, click on a part number.

Bronze Body

Repair Kit for 125 Pressure Class

Repair Kit for 200 and 300 Pressure Classes

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Disc Material: See table
Seal Material: See table

Valves												Repair Kits
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Disc Material	Seal Material	End-to-End Lg.	Features		Each		Each
NPT Female × NPT Female—Pressure Class 125
1/4	3.3	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	2 1/8"	Removable Cap	0000000	000000	0000000	000000
3/8	6	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	2 1/8"	Removable Cap	0000000	00000	0000000	00000
1/2	10	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	2 5/16"	Removable Cap	0000000	00000	0000000	00000
3/4	18	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	2 5/8"	Removable Cap	0000000	00000	0000000	00000
1	31	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	3 1/4"	Removable Cap	0000000	00000	0000000	00000
1 1/4	54	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	3 9/16"	Removable Cap	0000000	000000	0000000	00000
1 1/2	76	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	4"	Removable Cap	0000000	000000	0000000	00000
2	131	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Bronze	Bronze	4 3/4"	Removable Cap	0000000	000000	0000000	000000
2 1/2	192	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Bronze	Bronze	6"	Removable Cap	0000000	000000	0000000	000000
3	297	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Bronze	Bronze	6 7/8"	Removable Cap	0000000	000000	0000000	000000
NPT Female × NPT Female—Pressure Class 150
1/4	2.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	00000	000000	00
3/8	4.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	00000	000000	00
1/2	7.2	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	2 5/8"	Removable Cap	0000000	00000	000000	00
3/4	13	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	3"	Removable Cap	0000000	000000	000000	00
1	22	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	3 11/16"	Removable Cap	0000000	000000	000000	00
1 1/4	39	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	4 3/8"	Removable Cap	0000000	000000	000000	00
1 1/2	56	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	4 5/8"	Removable Cap	0000000	000000	000000	00
2	92	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	000000	00
2 1/2	150	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	7"	Removable Cap	0000000	000000	000000	00
3	240	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	7 7/8"	Removable Cap	0000000	00000000	000000	00
NPT Female × NPT Female—Pressure Class 200
1/4	2.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
3/8	4.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
1/2	7.2	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 5/8"	Removable Cap	0000000	000000	00000000	00000
3/4	13	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	3"	Removable Cap	0000000	000000	00000000	00000
1	22	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	3 11/16"	Removable Cap	0000000	000000	00000000	00000
1 1/4	39	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	4 3/8"	Removable Cap	0000000	000000	00000000	000000
1 1/2	56	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	4 5/8"	Removable Cap	0000000	000000	00000000	000000
2	92	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	00000000	000000
2 1/2	150	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	7"	Removable Cap	0000000	000000	00000000	00000000
NPT Female × NPT Female—Pressure Class 300
1/4	2.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
3/8	4.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
1/2	7.2	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 5/8"	Removable Cap	0000000	000000	00000000	00000
3/4	13	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	3"	Removable Cap	0000000	000000	00000000	00000
1	22	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	3 11/16"	Removable Cap	0000000	000000	00000000	00000
1 1/4	39	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	4 3/8"	Removable Cap	0000000	000000	00000000	000000
1 1/2	56	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	4 5/8"	Removable Cap	0000000	000000	00000000	000000
2	92	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	00000000	000000
2 1/2	150	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	7"	Removable Cap	0000000	00000000	00000000	00000000

High-Cycling Threaded Check Valves

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Disc Material: Bronze
Seal Material: See table

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.

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.

For technical drawings and 3-D models, click on a part number.

Bronze Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Seal Material	End-to-End Lg.	Features		Each
NPT Female × NPT Female
1/2	2.87	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	2 9/16"	Removable Cap	0000000	0000000
1/2	2.87	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Brass	2 3/16"	Removable Cap	0000000	000000
3/4	5.24	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	3"	Removable Cap	0000000	000000
3/4	5.24	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Bronze	2 1/2"	Removable Cap	0000000	000000
1	8.86	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	3 1/2"	Removable Cap	0000000	000000
1	8.86	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Bronze	3 1/16"	Removable Cap	0000000	000000
1 1/4	15.67	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	4 1/16"	Removable Cap	0000000	000000
1 1/4	15.67	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Bronze	3 5/8"	Removable Cap	0000000	000000
1 1/2	21.83	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	4 5/8"	Removable Cap	0000000	000000
1 1/2	21.83	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Bronze	3 7/8"	Removable Cap	0000000	000000
2	37.84	1,000 psi @ 70° F	520 psi @ 421° F	2	-20° to 450°	Bronze	5 3/4"	Removable Cap	0000000	000000
2	37.84	200 psi @ 70° F	175 psi @ 353° F	2	-20° to 405°	Bronze	4 11/16"	Removable Cap	0000000	000000

Check Valves with Solder-Connect Fittings

For Use With: Steam, Water
Disc Material: Bronze
Seal Material: Bronze

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.

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.

For technical drawings and 3-D models, click on a part number.

Bronze Body
For Copper Tube Size	For Tube OD	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
Solder Connect × Solder Connect
1/4	3/8"	1.3	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 1/16"	Removable Cap	0000000	000000
3/8	1/2"	2.5	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 1/16"	Removable Cap	0000000	00000
1/2	5/8"	4.8	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 9/16"	Removable Cap	0000000	00000
3/4	7/8"	14.3	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	3 3/8"	Removable Cap	0000000	000000
1	1 1/8"	24	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	4 1/16"	Removable Cap	0000000	000000
1 1/2	1 5/8"	60	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	5 1/4"	Removable Cap	0000000	000000
2	2 1/8"	102	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	6 3/8"	Removable Cap	0000000	000000