Various zone valves are offered for terminal applications. The VVP45 two-port seat and VXP45 three-port seat valves work well in extreme pressure environments. The 2W two-port and 3W three-port valves are for water appli-cations where temperatures range significantly. Designed without the need for a pressure compensation membrane, the V.P45 valves have a stem stroke of 51¼2 mm, which virtually eliminates particle buildup, the company says. The 2W and 3W are for the control of induction and fan-coil units, as well as reheaters and heating coils in legacy systems.

Staefa Control System, 1000 Deerfield Parkway, Buffalo Grove, IL 60089; 800-735-4822; 847-215-8204 (fax); (Web site).