Shuttle Flow Switches | McMaster-Carr

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59 Products

Fixed-Setpoint Flow Switches for Drinking Water

Factory set to activate equipment when your drinking water system reaches a fixed level, these flow switches are easier to install than adjustable flow switches. They meet NSF/ANSI 61, so they're safe to use with drinking water. They actuate when your system’s flowing water pushes their paddle into a set position. These switches are single pole, single throw (SPST) and turn one device from off to on. IP rated, they seal out dust and can be lightly rinsed. They're accurate in any mounting orientation.

These flow switches are calibrated with water. You can use them with other liquids, but they may not measure accurately if the liquid’s viscosity differs from water.

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

Noryl Plastic Body
Pipe Size	Thread Type	Gender	Set Point, gpm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current @ Voltage	End-to-End Lg.	Environmental Rating	Specifications Met		Each
1/2	NPT	Female	0.6	145 psi @ 70° F	-4° to 212°	48V DC/ 230V AC	1 A @ 48 V DC, 1 A @ 230 V AC	2"	IP65	CE Marked, NSF/ANSI 61	0000000	0000000

Fixed-Setpoint Flow Switches

Since they come factory set to a specific set point, these switches are easier to install than adjustable flow switches. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. They’re accurate in any mounting orientation.

These switches are calibrated with and measure water accurately. They can also be used with other liquids by applying your liquid’s specific-gravity conversion factor to calculate the new set point.

Choose a fitting material that is compatible with the liquid you intend to run through your line. Polypropylene and PPS plastic fittings work with a wide range of chemicals. However, they can crack from impact or when overtightened. Bronze and 316 stainless steel fittings resist impact better than plastic fittings.

SPST (single pole, single throw) switches turn one device from off to on (normally open).

SPDT (single pole, double throw) switches can either turn one device from off to on (normally open) or from on to off (normally closed).

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

Straight

Bronze and
Stainless Steel Body
with Female Fittings

								Conduit
Pipe Size	Thread Type	Gender	Set Point, gpm	Approx. Difference Between Setpoint and Reset Point, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Trade Size	Thread Type	Gender	End-to-End Lg.	Mounting Orientation		Each
Bronze Body with Bronze Fittings
SPDT
1	NPT	Female	0.5	0.075	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	0000000
1	NPT	Female	1	0.15	300 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 3/8"	Any	0000000	000000
1	NPT	Female	2	0.3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	3	0.45	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 3/8"	Any	0000000	000000
1	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	6	0.9	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	8	1.2	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1 1/4	NPT	Female	1	0.15	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4"	Any	00000000	000000
1 1/4	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4"	Any	00000000	000000
1 1/4	NPT	Female	20	3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4"	Any	00000000	000000
1 1/2	NPT	Female	1.5	0.225	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	000000
1 1/2	NPT	Female	5	0.75	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	000000
1 1/2	NPT	Female	30	4.5	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	000000
2	NPT	Female	2	0.3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	000000
2	NPT	Female	5	0.75	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	000000
2	NPT	Female	50	7.5	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	000000
316 Stainless Steel Body with 316 Stainless Steel Fittings
SPDT
1	NPT	Female	0.5	0.075	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	2	0.3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	6	0.9	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1	NPT	Female	8	1.2	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	3 1/4"	Any	00000000	000000
1 1/4	NPT	Female	1	0.15	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	00000000
1 1/4	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	00000000
1 1/4	NPT	Female	20	3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	4 1/2"	Any	00000000	00000000
2	NPT	Female	2	0.3	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	00000000
2	NPT	Female	5	0.75	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	00000000
2	NPT	Female	50	7.5	400 psi @ 70 ° F	-20° to 300°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	1/2	NPT	Male	5 3/8"	Any	00000000	00000000

Elbow

Polypropylene Plastic Body with Polypropylene Plastic Fittings
	Pipe Size	Thread Type	Gender	Set Point, gpm	Approx. Difference Between Setpoint and Reset Point, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Mounting Orientation		Each
SPST
A	1/4	NPT	Female	0.042	0.006	200 psi @ 70 ° F	33° to 194°	500 mA @ 300 V AC 700 mA @ 350 V DC	Any	0000000	000000
B	3/4	NPT	Female	0.25	0.05	100 psi @ 70 ° F	0° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	Any	0000000	000000
B	3/4	NPT	Female	1	0.2	100 psi @ 70 ° F	0° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	Any	0000000	000000

Flow Switches

Activate or deactivate equipment when your flow rate reaches a set point. These switches have an adjustment screw to select your specific flow rate within the set point range. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They’re accurate in any mounting orientation.

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

Straight

						Conduit
Pipe Connections	Set Point Range, gpm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Bronze Body
1 NPT Female	1 to 6	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	0000000
1 NPT Female	2 to 8	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	000000
1 NPT Female	5 to 15	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	000000

Elbow

						Conduit
Pipe Connections	Set Point Range, gpm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	Port-to-Port Lg.		Each
Bronze Body
3/4 NPT Female	0.75 to 4	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	0000000
3/4 NPT Female	2 to 8	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	000000
3/4 NPT Female	7 to 14	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	000000

High-Pressure Flow Switches

Rated for pressures up to 3,600 psi, these switches measure the flow rate of liquids to activate or deactivate equipment when your flow rate reaches a set point. Tighten or loosen the adjustment screw on these switches to choose your flow rate anywhere within set point the range. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They must be mounted horizontally to function correctly. IP rated, they seal out dust and can be lightly rinsed.

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

	Set Point
Pipe Connections	Liquids, gpm	Gases, scfm	Approximate Difference Between Setpoint and Reset Point	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
SPDT
Brass Body with 304 Stainless Steel Fittings
1/4 NPT Female	0.06 to 0.08	0.008 to 0.107	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	0000000
1/4 NPT Female	0.25 to 2.6	0.033 to 0.347	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/4 NPT Female	0.3 to 6	0.04 to 0.8	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	1 to 8	0.133 to 1.067	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	2 to 10	0.267 to 1.334	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 7/8"	IP65	0000000	000000
3/4 NPT Female	8 to 34	1.067 to 4.534	Adjustable	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 7/8"	IP65	0000000	000000

High-Pressure Flow Switches for Oil

Measure the flow rate of oil at pressures up to 3,600 psi to activate or deactivate equipment. Designed to compensate for viscosity and density changes, these switches have an adjustment screw to select your specific flow rate within the set point range. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). Their IP65 rating protects them from dust and low-pressure washdowns, such as from a garden hose. All are accurate in any mounting orientation.

These switches are calibrated with and measure oil accurately. They can also be used with other liquids by applying your liquid’s specific-gravity conversion factor to calculate the new set point.

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

SPDT
Pipe Connections	Set Point, gpm	Approximate Difference Between Setpoint and Reset Point	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
Brass Body with Brass Fittings
1/4 NPT Female	0.03 to 0.12	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	0000000
1/4 NPT Female	0.05 to 0.3	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/4 NPT Female	0.2 to 0.9	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/4 NPT Female	0.5 to 2.5	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/2 NPT Female	1.5 to 5	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
3/4 NPT Female	1 to 11	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
3/4 NPT Female	2 to 18	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1 NPT Female	2 to 20	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	7 5/16"	IP65	0000000	000000

High-Pressure Flow Switches for Gases

Good for compressed-air systems and other compressed gases that reach up to 3,600 psi, these switches measure the flow rate to activate or deactivate equipment when they reach a set point. Tighten or loosen the adjustment screw to choose your flow rate anywhere within the set point range. As flowing gas pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They must be mounted horizontally to function correctly. IP rated, they seal out dust and can be lightly rinsed.

These switches are calibrated with and measure air accurately. They can also be used with other gases by applying your gases’ specific-gravity conversion factor to calculate the new set point.

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

SPDT
Pipe Connections	Set Point, scfm	Approximate Difference Between Setpoint and Reset Point	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
Brass Body with 304 Stainless Steel Fittings
1/4 NPT Female	0.4 to 4	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	0000000
1/4 NPT Female	2 to 10	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/4 NPT Female	3 to 24	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	4 to 30	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
3/4 NPT Female	10 to 90	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 7/8"	IP65	0000000	000000
3/4 NPT Female	30 to 130	Adjustable	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 7/8"	IP65	0000000	000000

Electronic Flow Switches

When these switches reach a set flow rate, they send digital signals to your programmable logic controller (PLC) to activate automated controls or alarms. Use the adjustment screw to select their set point. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. They must be mounted horizontally to function correctly. IP rated, they withstand dust, washdowns, and temporary submersion.

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

Aluminum/Brass/Plastic Body with Nickel-Plated Brass Fittings
Pipe Connections	Set Point Range, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	End-to-End Lg.	Environmental Rating	Specifications Met		Each
One Digital PNP Signal Output
3/4 NPT Female	0.26 to 6.6	360 psi @ 70° F	32° to 185°	100 mA @ 30 V DC	3"	IP65, IP67	C-UL Listed, UL Listed, CE Marked	0000000	0000000
1 NPT Female	1.32 to 26.4	360 psi @ 70° F	32° to 185°	100 mA @ 30 V DC	3 5/8"	IP65, IP67	C-UL Listed, UL Listed, CE Marked	0000000	000000