Dwyer Instruments Series V4 Flotect flow switch

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The Series V4 Flotect flow switch operates automatically to protect equipment and pipeline systems against damage from reduction or loss of flow.

A magnetically actuated switching design gives good performance, and 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.

The V4 Flotect switch features a leak-proof, explosion-proof (IECEx and ATEX) body machined from bar stock and weatherproof to IP65. There is a choice of custom vane calibrated for the application, and it can be used in pipes from 38 mm up. It installs directly and easily into a pipeline with a thredolet, tee or flange, and the electrical assembly can be easily replaced without removing the unit from installation.

The pressure rating is 69 bar with the brass body and 138 bar with the 316 SS body. Applications include protecting pumps, motors and other equipment against low or no flow; controlling the sequential operation of pumps; automatically starting auxiliary pumps and engines; stopping liquid-cooled engines, machines and processing when coolant flow is interrupted; shutting down burners when the airflow through heating coils fails; and controlling dampers according to flow.