Dwyer Flotect Vane Operated Flow Switch, Series V4
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Series V4 Flotect Vane-Operated Flow Switch

Brand: Dwyer Instruments, LLC
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The Series V4 Flotect® Flow Switches are rugged and reliable, ideal for automatically protecting equipment and pipeline systems against damage from reduction or loss of flow.

Time tested in thousands of pipeline installations and processing plants around the world this Series is Weatherproof, designed to meet NEMA 4 and Explosion-proof (listing included in specifications).

This series can be used in pipes 1-1/2" (38.10 mm) and up.
Features
  • Unique magnetically actuated switching design gives superior performance
  • A free-swinging vane which attracts a magnet within the solid metal switch body, actuating a snap switch by means of a simple lever arm with no bellows, springs, or seals to fail
  • Leak proof body machined from bar stock
  • Electrical assembly can be easily replaced without removing the unit from installation so that the process does not have to be shut down
  • Installs directly and easily into pipeline with a thredolet, tee, or flange (see application drawings)
  • High pressure rating of 1,000 psig (69 bar) with the brass body and 2,000 psig (138 bar) with the 316 SS body
  • Choice of custom vane calibrated for your application, Model V4, or field adjustable multilayer vane, Model V4-2-U

Displaying prices & availability for Ohio, United States in CAD. Change location.

Models matching criteria: 640
V4-SS-D-MV-TRI-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$852.00 CAD
$10.00 Shipping
V4-D-TRD
  • Body Material - Brass, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,795.00 CAD
$10.00 Shipping
V4-SS-MT-TRD
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$2,559.00 CAD
$10.00 Shipping
V4-SS-MT-TRI
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$109.00 CAD
$10.00 Shipping
V4-SS-2-U-D-MV-MT-TRI-316
  • Body Material - 316 Stainless Steel, Universal Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$113.00 CAD
$10.00 Shipping
V4-2-U-D-MV-TRI-316
  • Body Material - Brass Body, Universal Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$456.00 CAD
$10.00 Shipping
V4-2-U-NH-D-MV-TRD-316
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,264.00 CAD
$10.00 Shipping
V4-2-U-NH-D-MT
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,526.00 CAD
$10.00 Shipping
V4-SS-2-U-TRD
  • Body Material - 316 Stainless Steel, Universal Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$59.00 CAD
$10.00 Shipping
V4-D-MT-TRD-316-V
  • Body Material - Brass, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,632.00 CAD
$10.00 Shipping
V4-SS-D-MV-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,668.00 CAD
$10.00 Shipping
V4-NH-MV-MT-TRI-316
  • Body Material - Brass, Custom Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,907.00 CAD
$10.00 Shipping
V4-2-U-NH-TRD
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$2,054.00 CAD
$10.00 Shipping
V4-2-U
DWYER Vane Operated Flow Switch, Brass Body, Universal Vane. view more
  • Body Material - Brass Body, Universal Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$258.00 CAD
$10.00 Shipping
V4-D-316-V-IEC
  • Body Material - Brass, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - IECEx Certified Construction
100+ In Stock
$600.00 CAD
$10.00 Shipping
V4-SS-D-V-IEC
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - IECEx Certified Construction
100+ In Stock
$639.00 CAD
$10.00 Shipping
V4-SS-V-AT
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - ATEX Compliant Construction
100+ In Stock
$1,278.00 CAD
$10.00 Shipping
V4-SS-MV-MT-TRI-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,330.00 CAD
$10.00 Shipping
V4-2-U-NH-TRD-V
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$635.00 CAD
$10.00 Shipping
V4-SS-MT-TRD-316-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,201.00 CAD
$10.00 Shipping
V4-NH-MT-TRI-V
  • Body Material - Brass, Custom Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,300.00 CAD
$10.00 Shipping
V4-SS-MV-MT-TRD-316-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,629.00 CAD
$10.00 Shipping
V4-316-V-AT
  • Body Material - Brass, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - ATEX Compliant Construction
100+ In Stock
$2,183.00 CAD
$10.00 Shipping
V4-2-U-D-V-IEC
  • Body Material - Brass Body, Universal Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - IECEx Certified Construction
100+ In Stock
$108.00 CAD
$10.00 Shipping
V4-SS-TRD-316-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$543.00 CAD
$10.00 Shipping
V4-NH-TRD-316-V
  • Body Material - Brass, Custom Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,797.00 CAD
$10.00 Shipping
V4-2-U-NH-MV-316-V
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,996.00 CAD
$10.00 Shipping
V4-D-MV-316
  • Body Material - Brass, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$255.00 CAD
$10.00 Shipping
V4-NH-D-MV-MT-TRD-316
  • Body Material - Brass, Custom Vane, No Housing
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$950.00 CAD
$10.00 Shipping
V4-2-U-NH-TRD-316
  • Body Material - Brass, Universal Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,252.00 CAD
$10.00 Shipping
V4-SS-D-MT-V
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,822.00 CAD
$10.00 Shipping
V4-SS-2-U-D-MV-MT-TRI
  • Body Material - 316 Stainless Steel, Universal Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$2,411.00 CAD
$10.00 Shipping
V4-2-U-MV-TRI-316
  • Body Material - Brass Body, Universal Vane
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$2,480.00 CAD
$10.00 Shipping
V4-D-MV-MT-TRI-V
  • Body Material - Brass, Custom Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - 204° C (400° F)
  • Relay - Increasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$110.00 CAD
$10.00 Shipping
V4-SS-MV-TRD-316
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$494.00 CAD
$10.00 Shipping
V4-2-U-D-MT-TRD-316
  • Body Material - Brass Body, Universal Vane
  • Switch Type - DPDT Contacts
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,506.00 CAD
$10.00 Shipping
V4-2-U-MT-TRD-V
  • Body Material - Brass Body, Universal Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,858.00 CAD
$10.00 Shipping
V4-SS-2-U-MV-TRD-316-V
  • Body Material - 316 Stainless Steel, Universal Vane
  • Switch Type - SPDT Snap
  • Switching Element - Gold Contact Dry Circuit
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Vertical Up Flow
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$1,881.00 CAD
$10.00 Shipping
V4-NH-MT-TRD-316
  • Body Material - Brass, Custom Vane, No Housing
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - 204° C (400° F)
  • Relay - Decreasing Flow Time Delay Relay Option with 2 SPDT Contacts
  • Material - 316 Stainless Steel Magnet Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - Weatherproof & Explosion-Proof
100+ In Stock
$582.00 CAD
$10.00 Shipping
V4-SS-AT
  • Body Material - 316 Stainless Steel, Custom Vane
  • Switch Type - SPDT Snap
  • Switching Element - Standard
  • Temperature - -20° to 135° C (-4° to 275° F)
  • Relay - Standard
  • Material - 430 Stainless Steel Keeper
  • Flow Path - Upward Flow in Vertical Pipe
  • Agency Approvals - ATEX Compliant Construction
100+ In Stock
$649.00 CAD
$10.00 Shipping
Show More Models (600)

View Details

Specifications

Brand

Adjustable Set Point Range

  • 5 Vane Combination

Ambient Temperature Range

  • -20° to 73° C (-4° to 163° F)

Approvals & Certifications

  • ATEX
  • CE
  • CSA
  • Ex d IIB T6 Gb, II 2 G Ex d IIB T6 Gb
  • FM
  • IEC Ex
  • UL

Conduit Connection

  • 3/4” NPT Female

Electrical Connectors

  • 16 AWG, 6” (152 mm) Long
  • Terminal Block

Electrical Contacts

  • Gold-Plated Contacts, Options for Dry Circuits

Electrical Rating

  • 1 A at 125 Vac
  • 10 A at 125/250 Vac
  • 3 A at 30 Vdc
  • 5 A at 125/250 Vac
  • 5 A at 30 Vdc
  • 5 A Resistive

Enclosure, Body Material

  • 316 Stainless Steel
  • Brass

Environmental Protection

  • Class I, Groups C & D
  • Class II, Div. 1, Groups E, F, G
  • Explosion-proof
  • Weatherproof

Flow Rate

  • 17 to 10,000 scfm (8 to 4,700 LPS) - Cold Air
  • 3 to 2,400 gpm (11.67 to 9,083 LPM) - Cold Water

Media

  • Compatible Gas
  • Compatible Liquids

NPT Connection

  • 1-1/2” NPT Female

Pipe Size

  • 1.5” to 20”

Process Temperature

  • -20° to 73° C (-4° to 163° F)

Sensor Orientation

  • Horizontal
  • Within 5° of Vertical for Proper Operation

Supply Pressure

  • psig: 5,000 (kPa: 34,470, bar: 345)

Switch Type

  • DPDT Snap Switch
  • SPDT Snap Switch

Temperature Range

  • -20° to 135° C (-4° to 275° F)

Wetted Materials

  • 316 Stainless Steel - Vane
  • 430 Stainless Steel Standard - Magnet Keeper

  • Protects pumps, motors and other equipment against low or no flow
  • Controls sequential operation of pumps
  • Automatically starts auxiliary pumps and engines
  • Stops liquid cooled engines, machines and processing when coolant flow is interrupted
  • Shuts down burner when air flow through heating coil fails
  • Controls dampers according to flow

Documentation

Data Sheets

Approval

Approvals

Catalogs

Manuals

show more