Hydraulic Needle Valves | McMaster-Carr

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1,000 psi to 3,999 psi

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44 Products

Flow-Adjustment Inline Hydraulic Valves

Turn the dial to gradually adjust the amount of flow. Five colored rings on the valve stem represent different flow rates. Adjust the dial until you see the color of the flow rate you need.

One Direction with Unrestricted Reverse—NPTF Female

Image of Product. Front orientation. Flow-Regulating Valves. Flow-Adjustment Inline Hydraulic Valves .

One-direction-with-unrestricted-reverse valves regulate flow in one direction while allowing oil to flow freely in the opposite direction.

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have better corrosion resistance than steel valves.

	Inlet/Outlet Connection						Overall
	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		1/8	02	3	0.23	5,000	Buna-N	2"	3/4"	1 3/4"	2"	Needle	0000000	000000


		1/4	04	5	0.43	5,000	Buna-N	2 5/8"	7/8"	2"	2 5/8"	Needle	0000000	00000
		3/8	06	8	0.79	5,000	Buna-N	2 3/4"	1"	2 1/2"	2 3/4"	Needle	0000000	00000
		1/2	08	15	0.98	5,000	Buna-N	3 1/2"	1 1/4"	3"	3 1/2"	Needle	0000000	000000
		3/4	12	25	2.47	3,000	Buna-N	3 7/8"	1 1/2"	3 5/8"	3 7/8"	Needle	0000000	000000
		1	16	40	5.25	3,000	Buna-N	5"	1 7/8"	5 1/8"	5"	Needle	0000000	000000


		Brass Body



				1/8	02	3	0.23	2,000	Buna-N	2"	3/4"	1 3/4"	2"	Needle	0000000	00000


				1/4	04	5	0.43	2,000	Buna-N	2 5/8"	7/8"	2"	2 5/8"	Needle	0000000	00000
				3/8	06	8	0.79	2,000	Buna-N	2 3/4"	1"	2 1/2"	2 3/4"	Needle	0000000	00000
				1/2	08	15	0.98	2,000	Buna-N	3 1/2"	1 1/4"	3"	3 1/2"	Needle	0000000	000000
				3/4	12	25	2.47	2,000	Buna-N	3 7/8"	1 1/2"	3 5/8"	3 7/8"	Needle	0000000	000000

One Direction with Unrestricted Reverse—UN/UNF (SAE Straight) Female

One-direction-with-unrestricted-reverse valves regulate flow in one direction while allowing oil to flow freely in the opposite direction.

UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.

	Inlet/Outlet Connection						Overall
	Thread Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		7/16"-20	04	3	0.23	5,000	Buna-N	2 3/4"	7/8"	1 7/8"	2 3/4"	Needle	0000000	0000000


		9/16"-18	06	5	0.43	5,000	Buna-N	3 1/8"	1"	2 1/4"	3 1/8"	Needle	0000000	000000
		3/4"-16	08	8	0.79	5,000	Buna-N	3 1/2"	1 1/8"	2 5/8"	3 1/2"	Needle	0000000	000000
		7/8"-14	10	15	0.98	5,000	Buna-N	4"	1 1/4"	3"	4"	Needle	0000000	000000
		1 1/16"-12	12	25	2.47	3,000	Buna-N	4 5/8"	1 1/2"	3 5/8"	4 5/8"	Needle	0000000	000000

Two Direction—NPTF Female

Two-direction valves regulate flow in either direction.

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have better corrosion resistance than steel valves.

	Inlet/Outlet Connection						Overall
	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		1/8	02	3	0.23	5,000	Buna-N	1 1/2"	3/4"	1 3/4"	1 1/2"	Needle	0000000	000000


		1/4	04	5	0.44	5,000	Buna-N	2"	7/8"	2"	2"	Needle	0000000	00000
		3/8	06	8	0.79	5,000	Buna-N	2 1/2"	1"	2 1/2"	2 1/2"	Needle	0000000	00000
		1/2	08	15	0.98	5,000	Buna-N	2 5/8"	1 1/4"	3"	2 5/8"	Needle	0000000	000000
		3/4	12	25	2.47	5,000	Buna-N	3 1/4"	1 1/2"	3 5/8"	3 1/4"	Needle	0000000	000000


		Brass Body



				1/8	02	3	0.23	2,000	Buna-N	1 1/2"	3/4"	1 3/4"	1 1/2"	Needle	0000000	00000


				1/4	04	5	0.44	2,000	Buna-N	2"	7/8"	2"	2"	Needle	0000000	00000
				3/8	06	8	0.79	2,000	Buna-N	2 1/2"	1"	2 1/2"	2 1/2"	Needle	0000000	00000
				1/2	08	15	0.98	2,000	Buna-N	2 5/8"	1 1/4"	3"	2 5/8"	Needle	0000000	000000
				3/4	12	25	2.47	2,000	Buna-N	3 1/4"	1 1/2"	3 5/8"	3 1/4"	Needle	0000000	000000

Precision Flow-Adjustment Inline Hydraulic Valves

A tapered needle gives you more precise control than standard flow-adjustment inline hydraulic valves. Five colored rings on the valve stem represent different flow rates. Adjust the dial until you see the color of the flow rate you need.

Two Direction—NPTF Female

Image of Product. Front orientation. Flow-Regulating Valves. Precision Flow-Adjustment Inline Hydraulic Valves .

NPTF (Dryseal) threads are compatible with NPT threads.

	Inlet/Outlet Connection						Overall
	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		1/8	02	3	0.24	5,000	Buna-N	1 1/2"	1 3/4"	3"	1 1/2"	Needle	0000000	0000000


		1/4	04	5	0.49	5,000	Buna-N	2"	2"	3 7/8"	2"	Needle	0000000	00000
		3/8	06	8	1.29	5,000	Buna-N	2 1/2"	2 1/2"	4 3/8"	2 1/2"	Needle	0000000	000000
		1/2	08	15	1.93	5,000	Buna-N	2 5/8"	3 1/4"	5 3/4"	2 5/8"	Needle	0000000	000000
		3/4	12	25	3.21	5,000	Buna-N	3 1/4"	3 7/8"	6 3/8"	3 1/4"	Needle	0000000	000000

Two Direction—UN/UNF (SAE Straight) Female

UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.

	Inlet/Outlet Connection						Overall
	Thread Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		7/16"-20	04	3	0.24	5,000	Buna-N	2"	1 3/4"	3 1/4"	2"	Needle	0000000	0000000


		9/16"-18	06	5	0.49	5,000	Buna-N	2 3/8"	2"	4"	2 3/8"	Needle	0000000	000000
		3/4"-16	08	8	1.29	5,000	Buna-N	3"	2 1/2"	4 7/8"	3"	Needle	0000000	000000
		1 1/16"-12	12	25	3.21	5,000	Buna-N	4"	3 7/8"	6 3/8"	4"	Needle	0000000	000000

Adjustable Inline Hydraulic Flow-Regulating Valves

Set your flow rate and then adjust it as necessary; these valves maintain flow rate despite pressure changes in the system. Five colored rings on the valve stem represent different flow rates. Adjust the dial until you see the color of the flow rate you need.

NPTF (Dryseal) threads are compatible with NPT threads.

One Direction—NPTF Female

Image of Product. Front orientation. Flow-Regulating Valves. Adjustable Inline Hydraulic Flow-Regulating Valves .

One-direction valves regulate flow in one direction. They are not recommended for systems that may have reverse flow.

	Inlet/Outlet Connection						Overall
	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		1/4	04	3	Not Rated	3,000	Buna-N	3 5/8"	1 3/8"	2 3/4"	3 5/8"	Needle	0000000	0000000


		3/8	06	6	Not Rated	3,000	Buna-N	4 1/8"	1 1/2"	3 1/8"	4 1/8"	Needle	0000000	000000
		1/2	08	15	Not Rated	3,000	Buna-N	5"	1 3/4"	4"	5"	Needle	0000000	000000
		3/4	12	25	Not Rated	3,000	Buna-N	5 7/8"	2 1/4"	5 1/8"	5 7/8"	Needle	0000000	000000

One Direction with Unrestricted Reverse—NPTF Female

One-direction-with-unrestricted-reverse valves regulate flow in one direction while allowing fluid to flow freely in the opposite direction.

	Inlet/Outlet Connection						Overall
	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Seal Material	Lg.	Wd.	Ht.	Port-to-Port Lg.	Valve Type		Each
Steel Body



		1/4	04	3	Not Rated	3,000	Buna-N	3 5/8"	1 3/8"	2 1/2"	3 5/8"	Needle	0000000	0000000


		3/8	06	6	Not Rated	3,000	Buna-N	4 1/8"	1 1/2"	2 7/8"	4 1/8"	Needle	0000000	000000
		1/2	08	15	Not Rated	3,000	Buna-N	5"	1 3/4"	3 3/4"	5"	Needle	0000000	000000
		3/4	12	25	Not Rated	3,000	Buna-N	5 7/8"	2 1/4"	4 5/8"	5 7/8"	Needle	0000000	000000
		1	16	50	Not Rated	3,000	Buna-N	7"	2 3/4"	6 1/4"	7"	Needle	0000000	000000