Exhaust Flow Valves | McMaster-Carr

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	Inlet Pipe Size Inlet Pipe Size

	Inlet Thread Type Inlet Thread Type

	Valve Function Valve Function	Show

Exhaust Flow

	Valve Function Valve Function	Hide

Air Pulse

Backflow Prevention

Back-Pressure
Regulation

Temperature Regulation

Vacuum Regulation

	Shape Shape


Straight	90° Elbow

	Actuation Actuation


Air	Pressure

	Outlet Pipe Size Outlet Pipe Size

	For Use With For Use With

Compressed Air

	Body Material Body Material

	Valve Type Valve Type

Exhaust

Needle

	Inlet Connection Type Inlet Connection Type


Pipe	Tube

	Overall Length Overall Length

	Number of Flow Ports Number of Flow Ports

	Outlet Connection Type Outlet Connection Type


Pipe	Tube

	Exhaust Pipe Size Exhaust Pipe Size

	For Outlet Tube OD For Outlet Tube OD

	Inlet Gender Inlet Gender

Female

Male

	Flow Control Flow Control

None

One Direction

	Maximum Temperature Maximum Temperature

100° to 249.9° F

250° to 499.9° F

Not Rated

	Minimum Temperature Minimum Temperature

	Maximum Pressure Maximum Pressure

125 psi

145 psi

150 psi

	Flow Coefficient (Cv) Flow Coefficient (Cv)

0.06
0.075
0.1
0.14
0.15
0.17
0.201
0.313
0.44
0.52
0.54
0.78
0.8
1
1.016
1.09
1.5
1.524
1.6
1.728
2
2.33
2.71
2.98
2.982
3.13
3.6
5.45
5.965
7.84
Not Rated

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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52 Products

About Flow Control Valves

Also known as cylinder speed controls, flow control valves let you control the extension or retraction speed of your air cylinder. They regulate airflow as it passes from the valve's inlet to its outlet. Air flows freely in the opposite direction.

Matching Flow Diagrams to Replace an Air Directional Control Valve

Choosing an Air Directional Control Valve

Threaded Female
Inlet × Threaded
Female Outlet

Threaded Female Inlet × Threaded Male Outlet

Repair Kit

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 (Dryseal) threads are compatible with NPT threads.

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.

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

Valves
								Overall					Repair Kits
No. of Flow Ports	Inlet Size	Outlet Size	Exhaust Connection Type	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Pressure Range, psi	Body Material	Lg.	Wd.	Ht.		Each	Includes		Each
Threaded Female Inlet × Threaded Female Outlet
3	1/8 NPT	1/4 NPT	Threaded	61	1	20-125	Aluminum	1 7/8"	1 5/8"	1 7/16"	0000000	000000	Diaphragm, O-ring, Screws	00000000	00000
3	1/8 NPT	1/8 NPT	Threaded	58	1.09	15-150	Brass	1 1/8"	3/4"	1"	0000000	00000	__	000000	00
3	1/4 NPT	1/4 NPT	Threaded	141	2.33	20-125	Aluminum	2 1/16"	1 9/16"	2 1/8"	0000000	00000	Diaphragm, O-ring, Screws	00000000	0000
3	1/4 NPT	1/4 NPT	Threaded	65	1	20-125	Aluminum	1 7/8"	1 5/8"	1 7/16"	0000000	00000	Diaphragm, O-ring, Screws	00000000	0000
3	1/4 NPTF	1/4 NPTF	Threaded	159	2.71	30-125	Aluminum	1 3/4"	1 7/8"	2 9/16"	0000000	00000	Diaphragm	00000000	00000
3	3/8 NPT	3/8 NPT	Threaded	178	2.98	20-125	Aluminum	2 1/16"	1 9/16"	2 1/8"	0000000	00000	Diaphragm, O-ring, Screws	00000000	0000
3	3/8 NPTF	3/8 NPTF	Threaded	__	3.13	30-125	Zinc	1 3/4"	1 7/8"	2 9/16"	0000000	000000	Diaphragm	00000000	00000
3	1/2 NPT	1/2 NPT	Threaded	336	5.45	20-125	Aluminum	3 1/8"	2 15/16"	3 5/16"	0000000	00000	Diaphragm, O-ring, Screws	00000000	0000
3	3/4 NPT	3/4 NPT	Threaded	447	7.84	20-125	Aluminum	3 1/8"	2 15/16"	3 5/16"	0000000	00000	Diaphragm, O-ring, Screws	00000000	0000
Threaded Female Inlet × Threaded Male Outlet
3	1/8 NPT	1/4 NPT	Threaded	58	1.09	15-150	Brass	1 5/16"	3/4"	1 1/2"	0000000	00000	__	000000	00
3	1/8 NPT	1/8 NPT	Threaded	58	1.09	15-150	Brass	1 1/8"	3/4"	1 5/16"	0000000	00000	__	000000	00
3	1/4 NPT	1/4 NPT	Threaded	58	1.09	15-150	Brass	1 1/8"	3/4"	1 1/2"	0000000	00000	__	000000	00
3	10-32 UNF	10-32 UNF	Threaded	9	0.17	15-150	Brass	5/8"	1/4"	1/2"	0000000	00000	__	000000	00

Elbow Air-Exhaust Control Valves with Flow Control

Control the flow of exhaust air while also regulating the exhaust air speed. These valves dump exhaust air to the atmosphere without routing it back through a directional control valve. They control flow in one direction as air flows from the inlet to the outlet, and adjust the volume of exhaust air exiting an air cylinder (meter out) to control its speed. Air flows freely in the opposite direction. They have a 90° elbow shape that allows you to install them in tight spaces. The push-to-connect outlet ports are for use with plastic or soft metal tubing; insert tubing into the ports. A muffler reduces exhaust noise. Also known as quick exhaust valves.

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

							Overall
No. of Flow Ports	Inlet Size	For Outlet Tube OD	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Pressure Range, psi	Body Material	Lg.	Wd.	Ht.		Each
Threaded Male Inlet × Push-to-Connect Female Outlet
3	1/8 NPT	1/4"	14.05	0.44	14-145	PBT Plastic	2 7/8"	11/16"	1 1/16"	00000000	000000
3	1/8 NPT	5/16"	24.91	0.78	14-145	PBT Plastic	2 7/8"	15/16"	1 3/16"	00000000	00000
3	1/8 NPT	3/8"	24.91	0.78	14-145	PBT Plastic	3 3/8"	15/16"	1 5/16"	00000000	00000
3	1/4 NPT	1/4"	14.05	0.44	14-145	PBT Plastic	2 7/8"	11/16"	1 1/8"	00000000	00000
3	1/4 NPT	5/16"	24.91	0.78	14-145	PBT Plastic	3 1/4"	15/16"	1 3/8"	00000000	00000
3	1/4 NPT	3/8"	24.91	0.78	14-145	PBT Plastic	3 3/8"	15/16"	1 5/8"	00000000	00000
3	1/4 NPT	3/8"	47.89	1.5	14-145	PBT Plastic	3 9/16"	15/16"	1 5/8"	00000000	00000
3	3/8 NPT	5/16"	24.91	0.78	14-145	PBT Plastic	3 1/4"	15/16"	1 1/8"	00000000	00000
3	3/8 NPT	3/8"	24.91	0.78	14-145	PBT Plastic	3 3/8"	15/16"	1 5/16"	00000000	00000
3	3/8 NPT	3/8"	51.09	1.6	14-145	PBT Plastic	3 9/16"	1 3/16"	1 3/4"	00000000	00000
3	1/2 NPT	3/8"	51.09	1.6	14-145	PBT Plastic	3 9/16"	1 3/16"	1 5/8"	00000000	00000

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) is a measurement that indicates how much airflow can pass through a valve.

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

							Overall
No. of Flow Ports	Inlet Size	Outlet Size	Max. Flow Rate, scfm @ 100 psi	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	0.1	30-125	Aluminum and Brass	1/2"	1/2"	1 13/16"	0000000	000000

Quiet Air-Exhaust Control Valves

A muffler on these valves reduces exhaust noise. They 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. Also known as quick exhaust valves.

							Overall
No. of Flow Ports	For Inlet Tube OD	For Outlet Tube OD	Maximum Flow Rate	Flow Coefficient (Cv)	Pressure Range, psi	Body Material	Lg.	Wd.	Ht.		Each
Push-to-Connect Female Inlet × Push-to-Connect Female Outlet
3	1/4"	1/4"	11.36 scfm @ 100 psi	0.8	14-145	PBT Plastic	2"	1/2"	3/4"	0000000	000000
3	1/4"	1/4"	6.82 scfm @ 100 psi	0.54	14-145	PBT Plastic	1 5/8"	1/2"	5/8"	0000000	00000
3	4mm	4mm	4.47 scfm @ 100 psi	0.14	14-145	PBT Plastic	39.7mm	10mm	14.3mm	0000000	00000
3	6mm	6mm	11.36 scfm @ 100 psi	0.8	14-145	PBT Plastic	44.5mm	11.6mm	19mm	0000000	00000
3	6mm	6mm	4.79 scfm @ 100 psi	0.15	14-145	PBT Plastic	41.3mm	11.6mm	15.9mm	0000000	00000

Air-Exhaust Flow Control Valves

Dial Flow Adjustment

Slotted Screw Flow Adjustment

Thumb Screw Flow Adjustment

Install these valves in the exhaust ports of air directional control valves to control exhaust air speed without needing access to your cylinder. They control flow in one direction as air moves from the inlet to the exhaust port (meter out). Air flows freely in the opposite direction. Valves exhaust to the atmosphere and include a muffler to reduce the exhaust noise.

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

							Overall
No. of Flow Ports	Inlet Size	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Max. Pressure, psi	Body Material	Hex Size	Dia.	Lg.		Each
Threaded Male Inlet
Dial Flow Adjustment Mechanism
2	1/8 BSPP	35	1.016	145	Aluminum	__	16mm	46mm	0000000	000000
2	1/4 BSPP	52.5	1.524	145	Aluminum	__	19.5mm	63.3mm	0000000	00000
2	3/8 BSPP	59.5	1.728	145	Aluminum	__	25mm	95.3mm	0000000	00000
2	1/2 BSPP	141.26	2.982	145	Aluminum	__	28mm	130mm	00000000	00000
2	3/4 BSPP	268.39	5.965	145	Aluminum	__	38mm	157mm	00000000	00000
Slotted Screw Flow Adjustment Mechanism
2	1/8 NPT	19.21	0.52	145	Aluminum	9/16"	5/8"	1 1/8"	0000000	00000
2	1/8 BSPP	19.21	0.52	145	Aluminum	14mm	15mm	27mm	00000000	00000
2	1/4 NPT	37	1	145	Aluminum	11/16"	3/4"	1 5/16"	0000000	00000
2	1/4 BSPP	37	1	145	Aluminum	17mm	18.2mm	32.1mm	00000000	00000
2	3/8 NPT	74	2	145	Aluminum	7/8"	1"	1 5/8"	0000000	00000
2	3/8 BSPP	74	2	145	Aluminum	22mm	25mm	41.1mm	00000000	00000
2	1/2 NPT	133.2	3.6	145	Aluminum	15/16"	1 1/16"	1 7/8"	0000000	00000
2	1/2 BSPP	133.2	3.6	145	Aluminum	24mm	27mm	44.6mm	00000000	00000
Thumb Screw Flow Adjustment Mechanism
2	1/8 BSPT	10.59	0.201	145	Brass	10mm	14mm	35.8mm	00000000	00000
2	1/4 BSPT	17.66	0.313	145	Brass	14mm	18mm	37mm	00000000	00000
2	M5 Metric	3.35	0.06	145	Brass	8mm	10mm	23.4mm	00000000	00000
2	M7 Metric	4.24	0.075	145	Brass	8mm	10mm	26.9mm	00000000	00000

Made-to-Order Air-Operated Air-Exhaust Control Valves

When these valves receive an air signal, they quickly dump exhaust air to the atmosphere without routing it back through a directional control valve to speed up the movement of equipment. They're often used with air compressors that require continuous operation. A muffler reduces exhaust noise. Also known as quick exhaust valves.

To Order: Specify minimum pressure and maximum pressure from the ranges listed. The difference between the minimum pressure and maximum pressure must be at least 10 psi, but no more than 30 psi.

							Overall
No. of Flow Ports	Inlet Size	For Outlet Tube ID	Air Pilot Size	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Body Material	Lg.	Wd.	Ht.	Choose a Pressure Range Min.	Choose a Pressure Range Max.		Each
Threaded Female Inlet × Barbed Male Outlet × Threaded Male Air Pilot
4	1/8 NPT	1/4"	1/4 NPT	20	Not Rated	Brass	2 7/8"	2 1/16"	3 3/8"	40 to 240 psi in 1 psi increments	50 to 250 psi in 1 psi increments	0000000	000000