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Flow Switches

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Flow switches detect fluid flow in hydraulic systems and prevent leaks. They are used in pumps in the water treatment, oil & gas and chemical industries.

IFM -

Flow Switch, 3/4 NPT Connection Size, 26.4, 363 PSI Max. Pressure, 24 VDC, DC/PNP, 100mA

Flow Switch, 3/4 NPT Connection Size, 26.4, 363 PSI Max. Pressure, 24 VDC, DC/PNP, 100mA
ModelItemPrice (inc. GST)
SBN333CR4LMQA$ 942.62
JOHNSON CONTROLS -

Air Flow Switch, 2-1/8 Inch x 6-7/8 Inch Paddle Size, 16.0/8.0

Air Flow Switch, 2-1/8 Inch x 6-7/8 Inch Paddle Size, 16.0/8.0
ModelItemPrice (inc. GST)
F262KDH-01CCR6AJWA$ 555.69
MCDONNELL & MILLER -

Flow Switch 1 Inch SPDT

Flow Switch 1 Inch SPDT
ModelItemPrice (inc. GST)
FS4-3AH6EQJA$ 387.33
DWYER INSTRUMENTS -

Liquid Flow Switch, 1/2 Inch MNPT, 1000 PSI Max. Pressure AC, SPST

Liquid Flow Switch, 1/2 Inch MNPT, 1000 PSI Max. Pressure AC, SPST
ModelItemPrice (inc. GST)
V10AH2CXNA$ 254.42
DAYTON -

Flow Protector Booster Pump 115 V

Flow Protector Booster Pump 115 V
ModelItemPrice (inc. GST)
1DGZ7AA9HXLA$ 968.06
DAYTON -

Flow Protector Booster Pump 230 V

Flow Protector Booster Pump 230 V
ModelItemPrice (inc. GST)
1DGZ8AA9HXMA$ 1111.05
MCDONNELL & MILLER -

Switch Liquid Flow, 1 1/4 MNPT, 300 Psi

Switch Liquid Flow, 1 1/4 MNPT, 300 Psi
ModelItemPrice (inc. GST)
FS7-4AD9ECVA$ 1479.62
MCDONNELL & MILLER -

Air Flow Switch, Brass, SPDT 120/240 V

Air Flow Switch, Brass, SPDT 120/240 V
ModelItemPrice (inc. GST)
AF-1AD9EDAA$ 818.09
SIEMENS -

Liquid Flow Switch, 1 MNPT Connection Size, 10, 160 psi Max. Pressure, 24V DC

Liquid Flow Switch, 1 MNPT Connection Size, 10, 160 psi Max. Pressure, 24V DC
ModelItemPrice (inc. GST)
QVE1900UCU2UTZA$ 384.31
HONEYWELL -

Flow Switch Kit, Single Pack

Flow Switch Kit, Single Pack
ModelItemPrice (inc. GST)
50053268-018/UBN9YWHA$ 381.88
See Details

Flow Switches

Flow switches are primarily designed to monitor the air, steam or liquid flow and send signals to the pump for automatic ON / OFF switching with the rise and fall of water level; ideal for regulating water cooling equipment and water treatment or hydronic heating systems. Raptor Supplies offers a wide range of these liquid flow switches from brands like Bradley, Dwyer Instruments, Mcdonnell & Miller, Dayton, Johnson Controls, Gems Sensors and Taco. Gems Sensors flow switches uses 100-micron filtration technology and are less susceptible to clogging than other high-pressure inline flow switches. These units come equipped with one-piece magnetic composite piston which actuates the sealed reed switch when displaced by the pressure difference in fluid flow, thereby activating remote alarms or indicators. They are available in brass, polypropylene and stainless steel construction with a maximum pressure rating and flow rate of 1500 psi and 2 GPM, respectively. Taco industrial flow switches feature flow sensitivity adjustment mechanism for setting a wide adjustment range to start or stop an electronically operated device when flow / no-flow condition occurs. These low-flow switches come with a highly malleable EPDM seal providing anti-hardening, cracking and leakage properties and improving the performance in high-pressure applications such as chillers, boilers, heating systems and water systems. They are available in NEMA 1 and NEMA 4 rated enclosures providing protection against the ingress of foreign contaminants and are ideal for use with 1 - 8 inch (outer diameter) pipe sizes.

Working Mechanism

  • The flow switch contains a sensor element positioned within the fluid's flow route.
  • When fluid flows through the sensor element, it exerts a force or causes a pressure differential.
  • The flow switch has an adjustable actuation threshold, which is the predetermined flow rate or pressure level that must be exceeded for the switch to activate.
  • The force or pressure on the sensor element causes a mechanical or electrical response within the flow switch when the fluid flow reaches or exceeds the actuation threshold.
  • When a flow switch is activated, it produces an output signal that can be used to initiate control functions, such as activating an alarm, opening or closing valves or commencing a shutdown sequence.

Frequently Asked Questions

How can I maintain the accuracy of my flow switch over time?

  • Regularly clean the flow switch and inspect it for any signs of damage, corrosion or debris buildup.
  • Verify that the flow switch is properly aligned within the flow path to ensure accurate measurements.
  • Periodically calibrate the flow switch to verify its accuracy.
  • Take into account the properties of the fluid being monitored, such as viscosity or density, as these factors can impact the accuracy of the flow switch.
  • Be aware of the ambient conditions surrounding the flow switch. Consider protective enclosures for use in harsh environments.
  • Maintain a record of the flow switch's calibration dates, maintenance activities and any observed issues.

What is the difference between a flow switch and a pressure switch?

A flow switch measures the flow rate of media flowing through a process line, whereas a pressure switch measures the pressure within a process line, pipe or vessel.

How do I select the right flow switch for my application?

Consider factors like the type of fluid, flow rate, operating conditions (temperature or pressure) and pipe size.

Do these flow switches require regular maintenance?

These flow switches require minimal maintenance. However, periodic inspection and cleaning are necessary to ensure proper functioning.

Can I use these flow switches for both liquids and gases?

Yes, these flow switches can be used to detect the flow of both liquids and gases.

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