Liquid Relief Valves | McMaster-Carr

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For Use With

Liquid Carbon Dioxide

Inlet Pipe Size

Set Pressure

Body Material

Pipe Size

Maximum Inlet Pressure

Less than 250 psi

250 psi to 499 psi

500 psi to 999 psi

1,000 psi to 1,249 psi

1,250 psi or greater

Relief Port Pipe Size

Outlet Pressure

Valve Type

Back-Pressure Regulator

Pressure Regulator

Relief

Set Pressure Configuration

Seal Material

Maximum Temperature

Valve Function

Back-Pressure Regulation

Maximum Pressure

1,000 psi to 1,999 psi

2,000 psi to 2,999 psi

Inlet Gender

Material

Shape

Inlet Connection

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

2B999

EAR99

Thread Type

NPT

UN/UNF (SAE Straight)

Gender

Outlet Pipe Size

105 Products

Precision-Adjustment Pressure-Relief Valves for Fuel

A finely threaded adjustment screw lets you make precise set pressure adjustments. These valves are for use with diesel fuel, fuel oil, gasoline, and kerosene. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.

NPT Male Inlet and NPT Female Relief Port

Bronze Body—Valves with a bronze body are harder and more durable than valves with a brass body for a longer service life.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Set Pressure Adjustment Method	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Brass Body—Brass Seal

			1/2	Bottom	400	1/2	Side	External Adjustment Screw	90° Elbow	5 7/8"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K54	0000000


			3/4	Bottom	400	3/4	Side	External Adjustment Screw	90° Elbow	6 1/4"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K55	000000




					Bronze Body—Bronze Seal

					1	Bottom	400	1	Side	External Adjustment Screw	90° Elbow	7 1/2"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K56	000000


					1 1/4	Bottom	400	1 1/4	Side	External Adjustment Screw	90° Elbow	8 1/4"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K57	000000
					1 1/2	Bottom	400	1 1/2	Side	External Adjustment Screw	90° Elbow	9 1/2"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K58	000000
					2	Bottom	400	2	Side	External Adjustment Screw	90° Elbow	10 7/8"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 400	4703K59	000000
					3	Bottom	300	3	Side	External Adjustment Screw	90° Elbow	13 3/16"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-60 to 450	Relief	0 to 14 , 15 to 25 , 26 to 40 , 41 to 75 , 76 to 110 , 111 to 130 , 131 to 150 , 151 to 200 , 201 to 300	4703K62	00000000

Adjustable Pressure-Relief Valves for Fuel

To gradually relieve pressure in lines for diesel fuel, fuel oil, gasoline, and kerosene, these valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.

NPT Female Inlet and Relief Port

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Set Pressure Adjustment Method	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Brass Body—416 Stainless Steel Seal

			3/8	Bottom	1,000	3/8	Side	External Adjustment Screw	90° Elbow	5 3/8"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K51	0000000


			1/2	Bottom	1,000	1/2	Side	External Adjustment Screw	90° Elbow	6 3/16"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K52	000000
			3/4	Bottom	1,000	3/4	Side	External Adjustment Screw	90° Elbow	6 15/16"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K53	000000
			1	Bottom	1,000	1	Side	External Adjustment Screw	90° Elbow	8 1/4"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K54	000000
			1 1/4	Bottom	1,000	1 1/4	Side	External Adjustment Screw	90° Elbow	9 9/16"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K55	000000
			1 1/2	Bottom	1,000	1 1/2	Side	External Adjustment Screw	90° Elbow	11 1/16"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	7844K56	000000
			2	Bottom	1,000	2	Side	External Adjustment Screw	90° Elbow	13"	Diesel Fuel, Fuel Oil, Gasoline, Kerosene	-20 to 400	Relief	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 250 to 600	7844K57	00000000

Adjustable Pressure-Relief Valves for Water

Alter the set pressure to suit your application. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. Tighten the locknut to prevent accidental changes in set pressure. Valves should not be used in applications that require the valve to close completely below the set pressure.

NPT Male Inlet and NPT Female Relief Port


Valve	Repair Kit

Valves															Repair Kits
Inlet			Relief		Set Pressure
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Range, psi	Adjustment Method	Shape	Features	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type		Each		Each







			Brass Body—Buna-N Seal

			1/4	Bottom	50	1/4	Side	0 to 50	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K711	0000000	———	0


			1/4	Bottom	150	1/4	Side	0 to 150	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K712	000000	———	0
			1/4	Bottom	300	1/4	Side	0 to 300	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K713	000000	———	0
			1/4	Bottom	700	1/4	Side	0 to 700	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K714	000000	———	0
			1/4	Bottom	1,000	1/4	Side	0 to 1,000	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K75	000000	———	0
			3/8	Bottom	150	3/8	Side	0 to 150	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K911	000000	———	0
			3/8	Bottom	300	3/8	Side	0 to 300	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K912	000000	———	0
			3/8	Bottom	700	3/8	Side	0 to 700	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K913	000000	———	0
			3/8	Bottom	1,000	3/8	Side	0 to 1,000	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K76	000000	———	0
			3/8	Bottom	1,200	3/8	Side	0 to 1,200	T-Handle	90° Elbow	Locknut, Removable Bonnet	4"	Water	-30 to 160	Relief	9763K77	000000	———	0
			1/2	Bottom	50	1/2	Side	0 to 50	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K49	00000	9763K78	000000


			1/2	Bottom	300	1/2	Side	0 to 300	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K51	00000	9763K72	00000
			1/2	Bottom	700	1/2	Side	0 to 700	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K53	00000	9763K73	00000
			1/2	Bottom	1,200	1/2	Side	0 to 1,200	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K55	000000	9763K74	00000
			3/4	Bottom	50	3/4	Side	0 to 50	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K59	00000	9763K78	00000
			3/4	Bottom	300	3/4	Side	0 to 300	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K61	00000	9763K72	00000
			3/4	Bottom	700	3/4	Side	0 to 700	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K63	00000	9763K73	00000
			3/4	Bottom	1,200	3/4	Side	0 to 1,200	T-Handle	90° Elbow	Locknut	6 5/8"	Water	-30 to 160	Relief	9763K65	000000	9763K74	00000

Pressure-Relief Valves for Water

These valves are commonly used with pumps in low-pressure water systems. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Set pressure is not adjustable.

NPT Female Inlet and Relief Port

Image of Product. Front orientation. Female Inlet. Pressure-Relief Valves for Water.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Brass Body—Rubber Seal

			2	Bottom	120	2	Side	90° Elbow	6 9/16"	Water	33 to 180	Relief	30 , 65	4780K16	0000000

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Pressure-Relief Valves for Water, Male Inlet, Female Relief Port.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Brass Body—Rubber Seal

			1/2	Bottom	120	1/2	Side	90° Elbow	4 3/16"	Water	33 to 180	Relief	30 , 75	4780K11	0000000


			3/4	Bottom	120	3/4	Side	90° Elbow	4 11/16"	Water	33 to 180	Relief	30 , 75	4780K12	000000
			1	Bottom	120	1	Side	90° Elbow	5 11/16"	Water	33 to 180	Relief	30 , 75	4780K13	000000
			1 1/4	Bottom	120	1 1/4	Side	90° Elbow	6 1/16"	Water	33 to 180	Relief	30 , 65	4780K14	000000

Hydraulic Pressure-Relief Valves


Iron	316 Stainless Steel

To set the pressure, unscrew the cap and turn the adjustment screw. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and close when the system pressure is restored below the set pressure.

Iron Body—Iron valves absorb vibration to reduce noise and wear in the pipeline.

316 Stainless Steel Body—316 stainless steel valves are more corrosion resistant than iron valves.

	Inlet Connection		Relief Connection		Overall
	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Temp. Range, ° F	Choose a Set Pressure, psi		Each
NPT Female Inlet and NPT Female Relief Port







				Iron Body

				3/8	06	3/8	06	2 1/16"	1 3/8"	5 3/8"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K32	0000000


				1/2	08	1/2	08	2 3/16"	1 7/16"	6 3/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K11	000000
				3/4	12	3/4	12	2 11/16"	1 11/16"	6 15/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K12	000000
				1	16	1	16	3 5/16"	2 1/16"	8 1/4"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K13	000000
				1 1/4	20	1 1/4	20	3 13/16"	2 1/2"	9 9/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K14	000000
				1 1/2	24	1 1/2	24	4 1/8"	2 7/8"	11 1/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	4704K25	000000
				2	32	2	32	4 5/8"	3 1/4"	13"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 250 to 600	4704K26	000000


				NPT Male Inlet and NPT Female Relief Port







								316 Stainless Steel Body

								1/2	08	1/2	08	1 5/8"	1 1/8"	4 3/16"	40 to 250	30 to 100 , 101 to 400 , 401 to 1,000 , 1,001 to 2,000	5027K11	000000

Made-to-Order Pressure-Relief Valves

Design a valve specifically for your process media and set pressure. Choose from a valve for air, inert gas, water, hydraulic oil, fuel oil, gasoline, or diesel fuel and a set pressure. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Body is 316 stainless steel for exceptional corrosion resistance.

NPT Female Inlet and Relief Port

For Use With—To Order: Please specify medium and a set pressure in 1 psi increments from the range listed in the table.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Choose a Set Pressure, psi	Shape	Overall Ht.	Temp. Range, ° F	Valve Type	For Use With		Each







			316 Stainless Steel Body—Fluoroelastomer Seal

			1/2	Bottom	3,300	3/4	Side	150 to 2,699	90° Elbow	7 1/2"	-10 to 400	Relief	Diesel Fuel , Fuel Oil , Gasoline , Hydraulic Oil , Water	6871K41	000000000


			1/2	Bottom	3,300	3/4	Side	150 to 3,300	90° Elbow	7 1/2"	-10 to 400	Relief	Air , Inert Gas	6871K42	00000000

NPT Male Inlet and NPT Female Relief Port

For Use With—To Order: Please specify medium and a set pressure in 1 psi increments from the range listed in the table.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Choose a Set Pressure, psi	Shape	Overall Ht.	Temp. Range, ° F	Valve Type	For Use With		Each







			316 Stainless Steel Body—Fluoroelastomer Seal

			3/4	Bottom	3,300	3/4	Side	150 to 2,269	90° Elbow	7 1/2"	-10 to 400	Relief	Air , Inert Gas	6871K52	000000000


			3/4	Bottom	3,300	3/4	Side	150 to 2,269	90° Elbow	7 1/2"	-10 to 400	Relief	Diesel Fuel , Fuel Oil , Gasoline , Hydraulic Oil , Water	6871K51	00000000
			1	Bottom	3,300	1	Side	150 to 2,421	90° Elbow	7 1/2"	-10 to 400	Relief	Diesel Fuel , Fuel Oil , Gasoline , Hydraulic Oil , Water	6871K61	00000000
			1	Bottom	3,300	1	Side	150 to 3,300	90° Elbow	7 1/2"	-10 to 400	Relief	Air , Inert Gas	6871K62	00000000

Back-Pressure-Regulating Valves for Water and Oil

Commonly used as bypass lines after centrifugal, reciprocating, and rotary pumps, these valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the threaded relief port. Adjust the set pressure within the range. Valves have a cast iron body that absorbs vibration from pressure changes to reduce wear and noise in your pipeline.

	Inlet			Outlet			Relief Port
	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	Pipe Size	Location	End-to-End Lg.	For Use With	Temp. Range, ° F	Choose an Outlet Pressure, psi		Each
NPT Female







				Cast Iron Body—Nickel Diaphragm and 303 Stainless Steel Seal

				1/2	Side	400	1/2	Side	Screw	1/2	Bottom	2 7/8"	Water, Oil	-40 to 200	0 to 25 , 5 to 50 , 30 to 100 , 75 to 175 , 150 to 400	4675K21	000000000


				1 1/4	Side	400	1 1/4	Side	Screw	1 1/4	Bottom	4 1/4"	Water, Oil	-40 to 200	20 to 85 , 40 to 125 , 50 to 230 , 175 to 380 , 300 to 400	4675K25	00000000
				1 1/2	Side	400	1 1/2	Side	Screw	1 1/2	Bottom	5"	Water, Oil	-40 to 200	10 to 55 , 30 to 100 , 40 to 200 , 125 to 300 , 200 to 400	4675K26	00000000
				2	Side	400	2	Side	Screw	2	Bottom	5"	Water, Oil	-40 to 200	10 to 55 , 30 to 100 , 40 to 200 , 125 to 300 , 200 to 400	4675K27	00000000

Pressure-Relief Valves for Oil

These valves are often used in hydraulic and lubrication systems. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Pressure-Relief Valves for Oil.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Set Pressure Adjustment Method	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Bronze Body—316 Stainless Steel Seal

			1/2	Bottom	1,400	3/4	Side	External Adjustment Screw	90° Elbow	7 1/4"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K81	0000000


			3/4	Bottom	1,400	3/4	Side	External Adjustment Screw	90° Elbow	7 1/4"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300	4460K82	000000
			1	Bottom	1,400	1	Side	External Adjustment Screw	90° Elbow	7 1/2"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K83	000000
			1 1/4	Bottom	1,400	1 1/4	Side	External Adjustment Screw	90° Elbow	8"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K84	000000
			1 1/2	Bottom	1,400	1 1/2	Side	External Adjustment Screw	90° Elbow	8 7/8"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4460K85	00000000

Pressure-Relief Valves for Cryogenic Applications

Cleaned and bagged to meet CGA G-4.1 for oxygen service and other high-purity applications, these valves are built to withstand the extreme cold of liquid carbon dioxide, liquid nitrogen, and liquid oxygen. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Set pressure is not adjustable. Valves are not intended for direct contact with cryogenic liquids.

Riser Tubes—Riser tubes (sold separately) are required to convert cryogenic liquids into gases before they contact the valve._3/8 NPT valve requires a _1/2 NPT × _3/8 NPT bushing when using a riser.

Adapters—Adapters (sold separately) convert the valve relief-port connection from UNEF female threads to NPT female threads.

	Valves											Riser Tubes		Adapters
	Inlet			Relief
	Pipe Size	Location	Max. Pressure, psi	Port Thread Size	Port Location	Overall Ht.	For Use With	Temp. Range, ° F	Choose a Set Pressure, psi		Each		Each		Each
NPT Male Inlet and UNEF Female Relief Port







				Brass Body

				1/4	Bottom	600	3/4"-20	Top	2 5/8"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K71	000000	49315K97	000000	49315K94	000000


				3/8	Bottom	600	3/4"-20	Top	2 5/8"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K72	00000	49315K98	00000	49315K94	00000
				1/2	Bottom	600	3/4"-20	Top	2 13/16"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K73	00000	49315K98	00000	49315K96	00000

Tamper-Resistant Hydraulic Pressure-Relief Valves

The pressure setting on these valves cannot be adjusted while they are installed. Use a hex key to unlock the locknut and turn the adjustment screw to set the pressure. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.

	Inlet Connection		Relief Connection		Overall
	Pipe Size	Dash Size	Pipe Size	Dash Size	Wd.	Ht.	For Use With	Temp. Range, ° F	Choose a Set Pressure, psi		Each
NPT Female Inlet and NPT Female Relief Port







				Aluminum Body

				1/2	08	1/2	08	1 1/4"	5"	Hydraulic Fluid	-40 to 250	40 to 125 , 115 to 250 , 235 to 450 , 630 to 850 , 630 to 1,000 , 800 to 1,500 , 1,400 to 2,100	5026K16	000000000

Adjustable Pressure-Relief Valves for Chemicals

Often used with catalysts, pH buffers, and electroplating solutions, these valves have a PVC body and an EPDM seal for excellent chemical resistance. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range. Valves have a port for attaching a pressure gauge.

NPT Female Inlet and Relief Port

Inlet			Relief		Set Pressure
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Range, psi	Adjustment Method	Shape	Features	Overall Ht.	Gauge Port Pipe Size	For Use With	Temp. Range, ° F	Valve Type		Each







			Dark Gray PVC Body—EPDM Seal

			1/2	Bottom	150	1/2	Side	5 to 75	External Adjustment Screw	90° Elbow	Gauge Port	6 3/4"	1/4	Aluminum Chloride, Boric Acid	40 to 140	Relief	5007K61	0000000


			3/4	Bottom	150	3/4	Side	5 to 75	External Adjustment Screw	90° Elbow	Gauge Port	6 7/8"	1/4	Aluminum Chloride, Boric Acid	40 to 140	Relief	5007K62	000000
			1	Bottom	150	1	Side	5 to 75	External Adjustment Screw	90° Elbow	Gauge Port	8 3/4"	1/4	Aluminum Chloride, Boric Acid	40 to 140	Relief	5007K63	000000
			1 1/2	Bottom	150	1 1/2	Side	5 to 75	External Adjustment Screw	90° Elbow	Gauge Port	13 1/4"	1/4	Aluminum Chloride, Boric Acid	40 to 140	Relief	5007K64	00000000
			2	Bottom	150	2	Side	5 to 75	External Adjustment Screw	90° Elbow	Gauge Port	15 1/2"	1/4	Aluminum Chloride, Boric Acid	40 to 140	Relief	5007K65	00000000

Long-Life Back-Pressure-Regulating Valves for Water and Oil

Image of Product. Front orientation. Contains Annotated. Pressure-Regulating Valves. Long-Life Back-Pressure-Regulating Valves for Water and Oil.

For a longer service than cast iron valves, these have a durable bronze body and a 303 stainless steel seal. Commonly installed as bypass lines after centrifugal, reciprocating, and rotary pumps, they obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the outlet. Adjust the set pressure within the range.

	Inlet			Outlet
	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	Port-to-Port Lg.	For Use With	Temp. Range, ° F	Choose an Outlet Pressure, psi		Each
NPT Female







				Bronze Body—303 Stainless Steel Seal

				1/4	Bottom	600	1/4	Side	Screw	1 1/4"	Water, Oil	-40 to 450	15 to 30 , 25 to 75 , 50 to 140 , 100 to 300 , 200 to 600	4662K46	0000000


				3/8	Bottom	600	3/8	Side	Screw	1 1/4"	Water, Oil	-40 to 450	15 to 30 , 25 to 75 , 50 to 140 , 100 to 300 , 200 to 600	4662K48	000000
				1/2	Bottom	600	1/2	Side	Screw	1 5/8"	Water, Oil	-40 to 450	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4662K32	000000
				3/4	Bottom	600	3/4	Side	Screw	1 5/8"	Water, Oil	-40 to 450	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4662K34	000000
				1	Bottom	600	1	Side	Screw	2 1/4"	Water, Oil	-40 to 450	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4662K36	000000
				1 1/4	Bottom	600	1 1/4	Side	Screw	2 1/4"	Water, Oil	-40 to 450	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4662K38	000000

Precision-Adjustment Pressure-Relief Valves for Water

Change set pressure without guesswork—the adjustment screw is marked in 25 psi increments for making pressure adjustments without a gauge. These valves are commonly used with thermal-expansion protection systems and low-capacity pumps. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Precision-Adjustment Pressure-Relief Valves for Water.

Bronze Body—Valves with a bronze body are harder and more durable than valves with a brass body for a longer service life.

Inlet			Relief		Set Pressure
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Range, psi	Adjustment Increment, psi	Adjustment Method	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type		Each







			Brass Body—Silicone Seal

			1/2	Bottom	220	1/2	Side	25 to 175	25	External Adjustment Screw	90° Elbow	4 1/8"	Water	33 to 200	Relief	8088K14	000000


			3/4	Bottom	220	3/4	Side	25 to 175	25	External Adjustment Screw	90° Elbow	4 1/8"	Water	33 to 200	Relief	8088K16	00000




					Bronze Body—Silicone Seal

					1/2	Bottom	175	1/2	Side	50 to 175	25	External Adjustment Screw	90° Elbow	3 7/16"	Water	33 to 200	Relief	4612K16	00000


					3/4	Bottom	175	1/2	Side	50 to 175	25	External Adjustment Screw	90° Elbow	3 7/16"	Water	33 to 200	Relief	4612K18	00000

Sanitary Back-Pressure-Regulating Valves

Designed to meet 3-A sanitary standards, these valves regulate liquid, gas, and air pressure in hygienic zones of food and beverage plants. They’re often used at the end of pipelines on processing and sanitizing equipment. Made of 316 stainless steel, they won't corrode from frequent washdowns with harsh cleaners. With an extremely smooth interior that self-drains, bacteria won't have time or space to grow. The spring and internal valve mechanisms are sealed off behind the diaphragm, which also prevents contamination. They connect with quick-clamp fittings, so disassembling to clean your line takes little time.

These valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the outlet. They meet ANSI/FCI 70-2 Class III standards for shut-off valves, meaning a maximum of 0.1% of fluid, gas, or air will escape through the outlet when they’re closed. An integrated T-handle lets you set the outlet pressure without additional tools. The diaphragm and seal resist repeated exposure to water, and they’re FDA compliant for direct contact with food.

	Inlet				Outlet				Lg.
	For Tube OD	Flange OD	Location	Max. Pressure, psi	For Tube OD	Flange OD	Location	Pressure Adjustment Method	End-to-End	Port-to-Port	For Use With	Temp. Range, ° F	Specs. Met	Food Industry Std.	Choose an Outlet Pressure, psi		Each
Quick Clamp







				316 Stainless Steel Body—EPDM Diaphragm and Seal

				3/4"	0.984"	Side	200	3/4"	0.984"	Bottom	T-Handle	6 5/8"	3 9/32"	Food, Beverage	-40 to 120	ANSI/FCI 70-2 Class III	3-A Certified 64-00, FDA Compliant 21 CFR 177.2600	5 to 30 , 35 to 90 , 50 to 105	4741N1	000000000


				1"	1.984"	Side	200	1"	1.984"	Bottom	T-Handle	6 11/16"	3 5/16"	Food, Beverage	-40 to 120	ANSI/FCI 70-2 Class III	3-A Certified 64-00, FDA Compliant 21 CFR 177.2600	5 to 30 , 35 to 90 , 50 to 105	4741N2	00000000




						316 Stainless Steel Body—PTFE Diaphragm and EPDM Seal

						2"	2.516"	Side	100	2"	2.516"	Bottom	T-Handle	11 5/8"	5 3/4"	Food, Beverage	-40 to 120	ANSI/FCI 70-2 Class III	3-A Certified 64-00, FDA Compliant 21 CFR 177.2600	10 to 25 , 15 to 60	4741N4	00000000

Easy-Adjust Hydraulic Pressure-Relief Valves


Brass	303 Stainless Steel

An external nut lets you adjust the pressure without disassembling the valve. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.

Brass Body—Brass valves have good corrosion resistance.

303 Stainless Steel Body—303 stainless steel valves are more corrosion resistant than brass valves.

	Inlet Connection		Relief Connection					Overall
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Max. Pressure, psi	Set Pressure Adjustment Method	Lg.	Wd.	Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each
NPT Female Inlet and NPT Female Relief Port







				Brass Body—Buna-N Seal

				1/4	04	1/4	04	4	3,600	External Adjustment Screw	1 11/16"	1 1/4"	3 11/16"	Hydraulic Fluid	-40 to 250	Relief	4 to 15 , 10 to 50 , 40 to 125 , 115 to 250 , 235 to 450 , 430 to 650 , 630 to 850 , 630 to 1,000 , 800 to 1,500 , 1,400 to 2,100 , 1,500 to 2,750 , 2,000 to 3,100 , 3,000 to 3,600	4706K53	0000000


				1/2	08	1/2	08	10	3,600	External Adjustment Screw	2 3/8"	1 3/4"	5 7/8"	Hydraulic Fluid	-40 to 250	Relief	4 to 15 , 10 to 50 , 40 to 125 , 115 to 250 , 235 to 450 , 430 to 650 , 630 to 850 , 630 to 1,000 , 800 to 1,500 , 1,400 to 2,100 , 1,500 to 2,750 , 2,000 to 3,100 , 3,000 to 3,600	4706K57	000000
				3/4	12	3/4	12	15	3,600	External Adjustment Screw	2 7/16"	1 3/4"	5 15/16"	Hydraulic Fluid	-40 to 250	Relief	4 to 15 , 10 to 50 , 40 to 125 , 115 to 250 , 235 to 450 , 430 to 650 , 630 to 850 , 630 to 1,000 , 800 to 1,500 , 1,400 to 2,100 , 1,500 to 2,750 , 2,000 to 3,100 , 3,000 to 3,600	4706K59	000000




						303 Stainless Steel Body—Buna-N Seal

						1/2	08	1/2	08	10	3,600	External Adjustment Screw	2 3/8"	1 3/4"	5 7/8"	Hydraulic Fluid	-40 to 250	Relief	4 to 15 , 10 to 50 , 40 to 125	4706K67	00000000


						3/4	12	3/4	12	15	3,600	External Adjustment Screw	2 7/16"	1 3/4"	5 15/16"	Hydraulic Fluid	-40 to 250	Relief	4 to 15 , 10 to 50 , 40 to 125	4706K69	00000000

Pressure-Regulating Inline Hydraulic Valves

When input pressure varies, use these valves to maintain a consistent pressure. They are often placed after a directional-control valve and before an actuator, such as a cylinder. They have an indicator/gauge port for the inlet and one for the outlet so you can monitor that output pressure remains steady.

	Inlet/Outlet Connection		Relief Connection				Overall
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Max. Pressure, psi	Lg.	Wd.	Ht.	For Use With	Choose a Set Pressure, psi		Each
NPT Female Inlet and Relief Port







				Cast Iron Body—Buna-N Seal

				3/4	12	1/4	04	33	3,000	5 7/8"	3 3/4"	7 1/8"	Hydraulic Fluid	100 to 1,000 , 500 to 2,000 , 1,000 to 3,000	9474T2	0000000

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

Block-Mount Hydraulic Pressure-Relief Valves


	D03 Mounting Pattern

Set a specific pressure and this valve will maintain it by diverting excess fluid from a pump to a tank. Valve opens at set pressure and closes when pressure drops. Use screws to attach to an NFPA valve-mounting block (each component sold separately).

	Valves													Screws
					Set Pressure		Overall
	NFPA Mounting Pattern	ISO Mounting Pattern	Max. Flow Rate, gpm	Max. Pressure, psi	Range, psi	Adjustment Method	Lg.	Wd.	Ht.	For Use With	Valve Type		Each	Pkg. Qty.		Pkg.
Inlet Relief Port







				Fluoroelastomer Seal

				D03	03	6.5	5,000	265 to 3,000	External Adjustment Screw	6 5/8"	1 7/8"	2"	Hydraulic Fluid	Relief	1624N11	000000000	4	1945N14	00000

Pressure-Regulating Block-Mount Hydraulic Valves


	D03 Mounting Pattern

These valves maintain a consistent pressure in a system when input pressure varies. They are often placed after a directional-control valve and before an actuator, such as a cylinder. Use screws to attach to an NFPA valve-mounting block (each component sold separately).

Valves											Screws
				Overall
NFPA Mounting Pattern	ISO Mounting Pattern	Max. Flow Rate, gpm	Max. Pressure, psi	Lg.	Wd.	Ht.	Set Pressure, psi	For Use With		Each	Pkg. Qty.		Pkg.







			Fluoroelastomer Seal

			D03	03	6.5	5,000	6 5/8"	2"	1 7/8"	365 to 3,000	Hydraulic Fluid	1517N11	000000000	4	1945N14	00000