Series V7 Flotect® Vane Operated Flow Switch

Magnetic Linkage, UL Approved

The Series V7 Flotect® Flow Switch is an inexpensive range switch for use with compatible liquids to start or stop electronic operated equipment when flow or no-flow conditions occur. Design is standard weatherproof, meeting NEMA 4X.

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Product Applications

  • Proof of boiler flow
  • Shuts down burner when air flow through heating coil fails
  • Protects pumps, motors and other equipment against low or no flow
  • Stops liquid cooled engines, machines and processing when coolant flow is interrupted

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

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Model Description Usually Ships* Price Order
Ships: Next Day
Price: $120.00
Flotect® vane operated flow switch, weatherproof, brass body, 1" NPT, trimmable vane. Next Day* $120.00 Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator


Liquids compatible with wetted materials that are non-coating and noncrystallizing.
Wetted Materials:
Vane: 301 SS, Process connection: Brass or 316 SS, Magnet: Ceramic, Other: 301, 302 SS.
Upper Body Material:
Die cast aluminum.
Temperature Limits:
-40 to 250°F (-40 to 121°C).
Pressure Limits:
250 psi (17.2 bar).
Enclosure Rating:
Weatherproof, meets NEMA 4X (IP66).
Switch Type:
SPDT snap switch.
Electrical Rating:
10 A @ 125, 250, 480 VAC; 1/8 hp @ 125 VAC, 1/4 hp @ 250 VAC.
Electrical Connections:
3 screw type, common, normally open and normally closed.
Conduit Connection:
1/2" NPSM.
Process Connection:
1" male NPT. Contact factory for optional tees.
Pipe Size:
1" to 4".
Mounting Orientation:
Horizontal or vertical (actuation flow rates are based on horizontal pipe runs in the vertical position). Will not work in vertical pipe with down flow.
Set Point Adjustment:
Vane is trimmable, see set point chart on Catalog page.
1 lb 2 oz (500 g).
Agency Approvals:


  • Superior performance with magnetically-actuated switching design
  • Increased product life due to free-swinging vane, which attracts a magnet within the solid metal switch body to actuate a snap switch by means of a simple lever arm with no bellows, springs, or seals to fail
  • Meets application requirements with durable leak proof body machined from bar stock
  • Long operating life with robust vane design which is rigid and field trimmable for set point adjustment

Model Chart

EXAMPLE V7 W B S 3 0 N ST Series V7-WBS-30N-ST Flotect® Vane Operated Flow Switch, weatherproof, brass lower body, SPDT, 1" male NPT, trimmable vane, with stainless steel tag.
SERIES V7               Flotect® Vane Operated Flow Switch
CONSTRUCTION   W             Weatherproof
CIRCUIT TYPE       S         SPDT
CONNECTION SIZE         3       1"
VANE SIZE           0     Full Length Vane with Template
TEE & TEE MATERIAL             N   No Tee
OPTIONS               ST
Stainless Tag Tag
Reinforced Vane

Product Literature


Catalog Pages




What does actuation and de-actuation mean?
Actuation means that the flow rate has reached a point where the microswitch trips or the contacts of the microswitch change state. De-actuation means that the flow rate has decreased to a point where the microswitch returns to its normal state.
What material is used as a seal between the process fluid and the electrical portion of the switch?
The body material; as there is no separate "seal" since the body is machined from solid stock and the switch is magnetically actuated.
On your Flow Switches, which model has a Form C type contact
Form C contact is a SPDT snap switch. Many of Dwyer’s flow switches have SPDT snap switches. The V4, V6, V7, FS-2, and V8 are some of them.

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