Dwyer Instruments V4-2-U Flow Switch

The Dwyer Instruments V4-2-U Flow Switch is a heavy-duty vane operated flow switch designed for reliable protection against flow loss in critical HVACR and industrial pipelines. This Flotect V4 series model features a brass body machined from bar stock for leak-proof integrity and a universal vane that is field-adjustable to accommodate pipe sizes from 1.5 inches up to 20 inches. Utilizing a unique magnetically actuated switching design, this unit eliminates the common failure points found in traditional switches, such as bellows, springs, or seals. The SPDT snap switch provides versatile control for starting auxiliary pumps, shutting down burners, or protecting motors from low-flow conditions. With a robust 1000 psig pressure limit and an explosion-proof, weatherproof NEMA 4 rating, it is a standard choice for contractors managing hazardous location installations or high-pressure liquid and gas systems. The field-replaceable electrical assembly allows for maintenance without interrupting the process flow, making this explosion proof flow switch a technician-favored solution for long-term system reliability.

• Field Adjustable Versatility: The multilayer universal vane can be customized on-site to fit various pipe diameters, reducing the need for multiple stocked SKUs.
• Magnetically Actuated Reliability: No mechanical seals or bellows to fatigue, ensuring consistent performance in demanding fluid and gas applications.
• High Pressure Durability: Rated for up to 1000 psig, making it suitable for high-stress commercial and industrial pumping systems.
• Serviceable Design: Electrical components can be swapped without removing the brass body from the pipeline, minimizing downtime during flow switch installation or repair.

Can the V4-2-U be used for both liquid and gas flow monitoring?
Yes, this switch is designed for use with any gases or liquids compatible with brass and 316 stainless steel wetted materials.

What mounting orientation is required for proper operation?
The unit should be installed within 5 degrees of vertical for the magnetic lever arm to function correctly in horizontal pipe runs.

How do I adjust the vane for different pipe sizes?
The universal vane consists of several layers; technicians simply remove the layers that are too long for the specific pipe diameter before installation.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.