Harwil Corporation was established over 49 years ago in 1956 to conceive, design, manufacture and market electro-mechanical fluid flow and liquid level switches. All designs are focused on producing simple, reliable, low cost units with broad operating flexibility in a multitude of physical, thermal and chemical operating environments.

Metal materials range from brass to stainless steel to Hastelloy® C to Titanium to special materials as required.

Plastic materials range from G.E. Noryl® (PPO) to Hoechst Celanese Fortron® (PPS) to Teflon® to Epoxy to special materials as required.

Elastomers range from BUNA N to EPDM to Hypalon® to Viton®fluoroelastomer.  Flow pipe size range from 0.5 inches to 16 inches or larger. Level switch ON/OFF differentials are available from 0.25 inches (6.4 mm) to 5 inches (127 mm) to 20 ft. or more.

Line pressure range from zero to 300 psi (~21 bar) depending upon each particular model.

Currently electric power and dry circuit switch actuation is provided by electro-mechanical micro switches and magnetic reed switches. Both AC and DC switching is standard.

Customer groups include heavy and light industrial manufacturing, chemical, petroleum production and refining, auto, transportation, aerospace, nuclear research facilities, government labs, mining, water production / distribution / processing, environmental pollution control, municipal wastewater, shipping, marine, fishing, etc.

Harwil Corporation supplies direct service to customers at all levels from Fortune 500 companies to small one person factories. We have a growing list of products that service many diverse O.E.M. industries such as steam generating, water purification, fuel filtering, underground water cleanup, semiconductor fabrication facilities, cooling tower equipment, industrial floor cleaning equipment, pool and spa, etc.

Several models of Harwil flow and level switches are now available with protective boots around the seal for use in highly particle contaminated environments.

In depth technical information to help you select the optimum Harwil product for your particular application is as close as your telephone, FAX machine, E-mail and World Wide Web.