Miniature Relief Valves | McMaster-Carr

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Set Pressure

For Use With

Inlet Pipe Size

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Inlet Thread Type

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Shape

Maximum Inlet Pressure

Inlet Connection

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Thread Type

UN/UNF (SAE Straight)

Overall Height

Fitting Connection

Material

RoHS

Compliant with Exemptions

Not Compliant

Inlet Connection Port

Maximum Temperature

REACH

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Inlet Gender

For Outlet Tube OD

Gender

Set Pressure Accuracy

Maximum Pressure

29 Products

Compact Pressure-Relief Valves

Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.

Steel Body—For Air

	Inlet							Each
	Pipe Size	Location	Max. Pressure, psi	Relief Port Location	Overall Ht.	Set Pressure		1-9	10-Up
NPTF Male Inlet and Relief Vent



		1/8	Bottom	1	Top	1/2"	0.3 psi	1093K11	00000	00000


		1/4	Bottom	Not Rated	Top	1 1/8"	1 psi	1093K21	00000	00000
		1/4	Bottom	Not Rated	Top	1 1/8"	7.5 psi	1093K22	00000	00000
		1/4	Bottom	Not Rated	Top	1 1/8"	15 psi	1093K23	00000	00000
		3/8	Bottom	Not Rated	Top	1 3/16"	1 psi	1093K31	00000	00000
		3/8	Bottom	Not Rated	Top	1 3/16"	7.5 psi	1093K32	00000	00000
		1/2	Bottom	Not Rated	Top	1 3/8"	1 psi	1093K41	00000	00000
		1/2	Bottom	Not Rated	Top	1 3/8"	7.5 psi	1093K42	00000	00000

Steel Body—For Grease and Oil

	Inlet							Each
	Pipe Size	Location	Max. Pressure, psi	Relief Port Location	Overall Ht.	Set Pressure		1-9	10-Up
NPTF Male Inlet and Relief Vent



		1/8	Bottom	5	Top	1/2"	1 psi	1093K1	00000	00000


		1/8	Bottom	15	Top	1/2"	7.5 psi	1093K2	0000	0000
		1/8	Bottom	25	Top	1/2"	15 psi	1093K3	0000	0000
		1/8	Bottom	80	Top	17/32"	45 psi	1093K4	0000	0000
		1/8	Bottom	140	Top	9/16"	80 psi	1093K53	0000	0000
		1/8	Bottom	200	Top	1/2"	100 psi	1093K64	0000	0000


		BSPT Male Inlet and Relief Vent



				1/8	Bottom	1	Top	1/2"	0.3 psi	1093K61	0000	0000


				1/8	Bottom	5	Top	1/2"	1 psi	1093K62	0000	0000
				1/8	Bottom	80	Top	1/2"	45 psi	1093K63	0000	0000

Nylon Body—For Air

Nylon valves have better corrosion resistance than steel valves. They are color coded based on the set pressure for easy identification.

	Inlet
	Pipe Size	Location	Max. Pressure	Relief Port Location	Overall Ht.	Seal Material	Choose a Set Pressure		Each
NPT Male Inlet and Relief Vent



		1/8	Bottom	Not Rated	Top	5/8"	Buna-N	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4277T51	000000


		1/4	Bottom	Not Rated	Top	11/16"	Buna-N	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4277T52	00000

Pressure-Relief Valves with Push-to-Connect Fittings for Air

For a low-pressure seal around plastic and soft metal tubing, these valves have push-to-connect fittings. They allow inline flow from the inlet to the outlet during normal conditions and divert flow to the relief port in overpressure conditions. The relief port begins opening at the set pressure and fully opens at about 10% over the set pressure. It begins closing as pressure drops and fully closes when the system pressure is restored below the set pressure. The vented relief port exhausts discharge directly. Set pressure is not adjustable. Valves are color coded based on the set pressure for easy identification.

	Inlet			Outlet
	For Tube OD	Location	Max. Pressure	For Tube OD	Location	Relief Port Location	Overall Ht.	For Use With	Temp. Range, ° F	Choose a Set Pressure		Each
Push to Connect Female Inlet, Outlet and Relief Vent







				Nylon Body—Buna-N Seal

				1/4"	Side	Not Rated	1/4"	Side	Top	1 1/4"	Air	26 to 255	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4320T13	000000


				5/16"	Side	Not Rated	5/16"	Side	Top	1 5/16"	Air	26 to 255	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4320T14	00000
				3/8"	Side	Not Rated	3/8"	Side	Top	1 1/2"	Air	26 to 255	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4320T15	00000
				1/2"	Side	Not Rated	1/2"	Side	Top	1 3/4"	Air	26 to 255	0.5 psi (Red) , 1 psi (Blue) , 1.5 psi (Light Green) , 3 psi (Light Blue) , 6 psi (Off-White) , 10 psi (Yellow)	4320T16	00000

Screw-In Hydraulic Pressure-Relief Valves

Set a specific pressure and these valves will maintain it. Also known as cartridge valves, these compact valves screw into your mounting block. They begin opening at the set pressure and fully open at about 20% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.

			Body—UN/UNF (SAE Straight)				Set Pressure
	Deltrol Equivalent Model No.	Hydraforce Equivalent Model No.	Thread Size	Dash Size	Max. Flow Rate, gpm	Max. Pressure, psi	Range, psi	Adjustment Method	Overall Ht.	For Use With	Valve Type		Each
Inlet Relief Port







				Anodized Aluminum Body—Buna-N Seal

				DRV2-080-N-K-4	—	3/4"-16	08	10	3,000	100 to 400	Knob	4"	Hydraulic Fluid	Relief	1628N11	000000


				DRV2-080-N-K-20	—	3/4"-16	08	10	3,000	300 to 2,000	Knob	4"	Hydraulic Fluid	Relief	1628N12	00000
				DRV2-080-N-K-30	—	3/4"-16	08	10	3,000	1,500 to 3,000	Knob	4"	Hydraulic Fluid	Relief	1628N13	00000
				DRV-100-N-K-4	RV10-20A-0-N	7/8"-14	10	10	3,000	100 to 400	Knob	4 1/2"	Hydraulic Fluid	Relief	1628N14	00000
				DRV-100-N-K-20	RV10-20A-0-N	7/8"-14	10	10	3,000	300 to 2,000	Knob	4 1/2"	Hydraulic Fluid	Relief	1628N15	00000
				DRV-100-N-K-30	RV10-20A-0-N	7/8"-14	10	10	3,000	1,500 to 3,000	Knob	4 1/2"	Hydraulic Fluid	Relief	1628N16	00000