Air Fuses | McMaster-Carr

	Inlet Pipe Size Inlet Pipe Size

1/4

3/8

1/2

3/4

	Outlet Pipe Size Outlet Pipe Size

	Maximum Flow Rate Maximum Flow Rate

	Shut-Off Flow Rate Shut-Off Flow Rate

	Flow Coefficient (Cv) Flow Coefficient (Cv)

	Overall Height Overall Height

	Overall Length Overall Length

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

DFARS Specialty Metals
COTS-Exempt

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5 Products

High Airflow Shut-Off On/Off Valves

Also known as air fuses, these valves close automatically to stop airflow when air volume exceeds the shut-off flow rate. They have NPTF (Dryseal) threads that are compatible with NPT threads.

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

								Overall
Inlet Pipe Size	Outlet Pipe Size	Flow Coefficient (Cv)	Min. Flow Rate	Max. Flow Rate	Shut-Off Flow Rate	Max. Pressure, psi	Temp. Range, °F	Lg.	Ht.		Each
NPTF Female Inlet × NPTF Female Outlet
Brass Body
1/4	1/4	2.2	1 scfm @ 100 psi	20 scfm @ 100 psi	20 scfm @ 100 psi	250	10° to 200°	2 3/16"	3/4"	0000000	000000
3/8	3/8	3.6	1 scfm @ 100 psi	50 scfm @ 100 psi	50 scfm @ 100 psi	250	10° to 200°	2 1/2"	7/8"	0000000	00000
1/2	1/2	6.7	1 scfm @ 100 psi	80 scfm @ 100 psi	80 scfm @ 100 psi	250	10° to 200°	3 1/8"	1 1/16"	0000000	000000
3/4	3/4	11.6	1 scfm @ 100 psi	130 scfm @ 100 psi	130 scfm @ 100 psi	250	10° to 200°	3 11/16"	1 3/8"	0000000	000000
1	1	17.5	1 scfm @ 100 psi	210 scfm @ 100 psi	210 scfm @ 100 psi	250	10° to 200°	4 5/8"	1 3/4"	0000000	000000