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Dwyer Series V4 FLOTECT® Vane Operated Flow Switches

FLOTECT® Vane Operated Flow Switches
Series V4

Rugged and reliable the Series V4 Flotect® flow switch operates automatically to protect equipment and pipeline systems against damage from reduction or loss of flow. The V4 is time tested being installed in thousands of pipelines and processing plants around the world. A unique magnetically actuated switching design gives superior performance. There are no bellows, springs, or seals to fail. Instead, a free-swinging vane attracts a magnet within the solid metal switch body, actuating a snap switch by means of a simple lever arm.

• Leak proof body machined from bar stock
• Choice of custom vane calibrated for your application, Model V4, or field adjustable multilayer vane, Model V4-2-U (see set point chart)
• Weatherproof, designed to meet NEMA 4
• Explosion-proof (listing included in specifications)
• Installs directly and easily into pipeline with a thredolet, tee, or flange (see application drawings)
• Can be used in pipes 1-1/2˝ and up
• Electrical assembly can be easily replaced without removing the unit from installation so that the process does not have to be shut down
• High pressure rating of 1000 psig (69 bar) with the brass body and 2000 psig (138 bar) with the 316 SS body

Select a link under the "item" tab below to order.

Cat #Descriptions
V4-2-UBrass body, universal vane
V4-SS-2-U316SS body, universal vane
V4Brass body, custom vane
V4-SS316SS body, custom vane
Service Gases or liquids compatible with wetted materials
Wetted Materials
Vane 316 SS
Body Brass or 316 SS standard
Magnet Keeper 430 SS standard, 316 SS optional
Options Other materials also available, consult factory (e.g. PVC, Hastelloy, Nickel, Monel, Titanium)
Temperature Limit -4 to 275°F (-20 to 135°C) standard, MT high temperature option 400°F (205°C) [MT option not UL, CSA, ATEX, or SAA]
Pressure Limit: Brass body 1000 psig (69 bar), 316 SS body 2000 psig (138 bar), optional 5000 psig (345 bar) available with 316 SS body and SPDT switch only
Enclosure Rating Weatherproof (meets NEMA 4 (IP65)) and Explosionproof. Listed with UL and CSA for Class I, Groups C and D; Class II, Groups E, F, and G. ATEX 0344 II 2 G EEx d IIB T6 -20°C≤Tamb≤75°C; EC-Type Certificate No.: KEMA 03ATEX 2383; SAA: Exd II C T6 (T amb=60°C). Zone I. Also FM approved
Switch Type SPDT snap switch standard, DPDT snap switch optional
Electrical Rating UL, FM, ATEX and SAA models 10A @ 125/250 VAC (V~). CSA models: 5A @ 125/250 VAC (V~); 5A res., 3A ind. @ 30 VDC (V ). MV option: 1A @125 VAC (V~); 1A res., .5A ind. @ 30 VDC (V ). MT option: 5A @ 125/250 VAC (V~). [MT and MV option not UL, CSA, FM, ATEX or SAA]
Electrical Connections UL and CSA models: 16 AWG, 6˝ (152 mm) long. ATEX and SAA unit: Terminal block
Conduit Connection 3/4˝ female NPT.
Process Connection 1-1/2˝ male NPT
Mounting Orientation Within 5° of vertical for proper operation. Units for horizontal installation (vertical pipe with up flow) available.
Set Point Adjustment For universal vane: five vane combinations
Weight 4 lb 8 oz (1.9 kg)
Agency Approvals UL, CSA, CE, FM, SAA, and ATEX


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