NPTF Pressure-Relief Valves

Filter by

System of Measurement

Outlet Pressure

For Use With

Inlet Pipe Size

Set Pressure

Maximum Inlet Pressure

Pipe Size

Inlet Thread Type

Body Material

Shape

Valve Type

Thread Type

Valve Function

Maximum Pressure

1,000 psi to 1,999 psi

4,000 psi or greater

Not Rated

Set Pressure Configuration

Inlet Connection

Actuation

Material

Fitting Connection

Outlet Pipe Size

Overall Height

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

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

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

Forward

How can we improve?

21 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
		1/8	Bottom	650	Top	1/2"	400 psi	1093K65	0000	0000

Miniature Ultra-High-Pressure-Regulating Valves for Water, Air, and Inert Gas

For extremely high-pressure applications in tight spots, these valves handle the same inlet pressures as other ultra-high-pressure-regulating valves within a smaller footprint. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. All have two gauge ports. Body is nickel-plated aluminum for good corrosion resistance. Valves are no-bleed style, so they keep the process gas contained within the valve.

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







				Nickel-Plated Aluminum Body—Buna-N Seal

				1/4	Side	6,000	1/4	Side	Knob	No	1/4	Side	NPTF Female	1 5/8"	Water, Air, Argon	-15 to 165	0 to 80, 0 to 140, 0 to 220	4428T23	0000000


				1/4	Side	6,000	1/4	Side	Knob	No	1/4	Side	NPTF Female	1 5/8"	Water, Air, Argon	-15 to 165	0 to 700, 0 to 1,200, 0 to 1,800	4428T24	000000

Air-Exhaust Control Valves

Allow airflow into your equipment and then quickly vent exhaust air to the atmosphere without routing it back through a directional control valve to speed up the movement of equipment. NPTF (Dryseal) threads are compatible with NPT threads. Also known as quick exhaust valves.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

								Overall
	No. of Flow Ports	Inlet Size	Outlet Size	Max. Flow Rate @ Pressure	Flow Coefficient (Cv)	Pressure Range, psi	Body Material	Lg.	Wd.	Ht.		Each
Threaded Female Inlet × Threaded Male Outlet



		3	1/8 NPTF	1/8 NPTF	6 scfm @ 100 psi	0.1	30 to 125	Aluminum, Brass	1/2"	1/2"	1 13/16"	6646K31	000000

Elbow Air-Exhaust Control Valves


Threaded Female Inlet × Threaded Female Outlet	Valve Diaphragms

The 90° elbow shape allows you to install these valves in tight spaces. They quickly vent exhaust air to the atmosphere or divert it to another place in your system to speed up the movement of air cylinders. Also known as quick exhaust valves.

NPTF Inlet Thread—NPTF (Dryseal) threads are compatible with NPT threads.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.

	Valves													Valve Diaphragms
									Overall
	No. of Flow Ports	Inlet Size	Outlet Size	Exhaust Connection	Max. Flow Rate @ Pressure	Flow Coefficient (Cv)	Pressure Range, psi	Body Material	Lg.	Wd.	Ht.		Each	Includes		Each
Threaded Female Inlet × Threaded Female Outlet



		3	1/4 NPTF	1/4 NPTF	Threaded	159 scfm @ 100 psi	2.71	30 to 125	Aluminum	1 3/4"	1 7/8"	2 9/16"	6646K32	000000	Diaphragm	6646K321	000000


		3	3/8 NPTF	3/8 NPTF	Threaded	Not Rated	3.13	30 to 125	Zinc Alloy	1 3/4"	1 7/8"	2 9/16"	6646K51	000000	Diaphragm	6646K321	00000