Speed Control Mufflers | McMaster-Carr

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

BSPP

Metric

	Fitting Material Fitting Material

	For Use With For Use With

Air

Inert Gas

Compressed Air

	Maximum Flow Rate Maximum Flow Rate

	For Reducing For Reducing

Noise

Particles

	System of Measurement System of Measurement

Inch

Metric

	Hex Size Hex Size

	Body Material Body Material

	Maximum Pressure Maximum Pressure

	Height Height

	Inlet Pipe Size Inlet Pipe Size

	Inlet Thread Type Inlet Thread Type

	Removes Particle Size Down To Removes Particle Size Down To

	Maximum Temperature Maximum Temperature

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

RoHS Compliant with
Exemptions

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Noise Reduction Rating Maximum Noise Reduction Rating

	Minimum Noise Reduction Rating Minimum Noise Reduction Rating

	Shape Shape


Straight	90° Elbow

	Valve Function Valve Function

Exhaust Flow

Flow Adjustment

	For Outlet Tube OD For Outlet Tube OD

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

REACH Compliant

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Matching Flow Diagrams to Replace an Air Directional Control Valve

Choosing an Air Directional Control Valve

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.

Flow-Control Mufflers

Adjust the flow by turning the screw. Use these mufflers with air-powered tools and cylinders to reduce noise and filter exhaust fumes.

For mufflers with an external hex drive, twist the screw and then tighten the hex nut with a wrench to secure. These mufflers are more secure than those with a thumb screw.

For mufflers with a thumb screw, twist the screw and friction secures them in place—no need to use a wrench. Often used in valve exhaust ports, these mufflers are not as secure as those with a nut.

Brass, bronze, and nylon mufflers offer good corrosion resistance.

Stainless steel mufflers offer excellent corrosion resistance.

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

Mufflers with External Hex Drive

NPT Brass

NPT 316 Stainless Steel

BSPP Nylon Plastic

Metric Nylon Plastic

NPT Male Brass Fitting
Pipe Size	Thread Size	Max. Flow Rate	Max. Pressure, psi	Max. Temp., °F	Ht.	For Use With	Removes Particle Size Down To, microns	Noise Reduction Rating, dB	Features		Each
1/8	__	20 scfm @ 100 psi	300	300°	1 5/16"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	00000
1/8	__	30 scfm @ 100 psi	300	300°	1 9/16"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
1/4	__	30 scfm @ 100 psi	300	300°	1 9/16"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
1/4	__	40 scfm @ 100 psi	300	300°	1 5/8"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
3/8	__	40 scfm @ 100 psi	300	300°	1 5/8"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
3/8	__	60 scfm @ 100 psi	300	300°	2"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
1/2	__	60 scfm @ 100 psi	300	300°	2"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	0000
1/2	__	70 scfm @ 100 psi	300	300°	2 3/8"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	00000
3/4	__	70 scfm @ 100 psi	300	300°	2 3/8"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	00000
1	__	100 scfm @ 100 psi	300	300°	2 1/2"	Air, Inert Gas	40	17-20	Adjustable Airflow	0000000	00000
NPT Male 316 Stainless Steel Fitting
1/8	__	12 scfm @ 100 psi	300	390°	1 1/4"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
1/4	__	25 scfm @ 100 psi	300	390°	1 9/16"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
3/8	__	30 scfm @ 100 psi	300	390°	1 5/8"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
1/2	__	50 scfm @ 100 psi	300	390°	1 15/16"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
3/4	__	70 scfm @ 100 psi	300	390°	2 1/4"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
1	__	100 scfm @ 100 psi	300	390°	2 3/8"	Air, Inert Gas	70	Not Rated	Adjustable Airflow	0000000	00000
BSPP Male Nylon Plastic Fitting
1/8	__	51 scfm @ 100 psi	145	210°	13/16"	Air, Inert Gas	75	10-20	Adjustable Airflow	0000000	0000
1/4	__	99 scfm @ 100 psi	145	210°	1 3/16"	Air, Inert Gas	75	10-20	Adjustable Airflow	0000000	00000
3/8	__	170 scfm @ 100 psi	145	210°	1 1/2"	Air, Inert Gas	75	10-20	Adjustable Airflow	0000000	00000
Metric Male Nylon Plastic Fitting
__	M5	19 scfm @ 100 psi	145	210°	5/8"	Air, Inert Gas	75	10-20	Adjustable Airflow	0000000	0000

Mufflers with Thumb Screw

NPT Bronze with Thumb Screw

NPT Male Bronze Fitting
Pipe Size	Max. Flow Rate	Max. Pressure, psi	Max. Temp., °F	Ht.	For Use With	Removes Particle Size Down To, microns	Noise Reduction Rating, dBA	Features		Each
1/8	6 scfm @ 100 psi	215	570°	1 1/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	00000
1/8	6 scfm @ 100 psi	215	570°	1 3/8"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000
1/4	9 scfm @ 100 psi	215	570°	1 3/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000
1/4	9 scfm @ 100 psi	215	570°	1 9/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000

Clog-Resistant Mufflers

Replace your muffler less often—these have a filter design that stays clean longer than porous mufflers. They’re often used in air-powered circuits to reduce noise and filter exhaust fumes.

Style A has a screw on top to adjust air flow.

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

NPT Male Zinc-Plated Steel Fitting
Style	Pipe Size	Max. Flow Rate	Max. Pressure, psi	Max. Temp., °F	Ht.	For Use With	Removes Particle Size Down To, microns	Noise Reduction Rating		Each
A	1/8	35 scfm @ 100 psi	150	400°	1 1/16"	Air	900	12-15 dBA	0000000	00000
A	1/4	52 scfm @ 100 psi	150	400°	1 5/8"	Air	900	12-15 dBA	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.

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.

							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

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

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

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