Sterlco .50 Inch 523 Packless Valve Straightway. Sterlco® Radiator Valve Model 523 is designed for both steam and hot water heating systems. It can be applied to sub-atmospheric steam systems of 25″vacuum with pressures up to 125 PSI and to water systems with working pressures up to 125 PSI. It is equipped with positive ?on? and ?off? control for any type of heating element or radiator.
523 Valve features a heavy brass body casting, brass union nut and nipple capable of resisting strains during installation. Unique design using primary and secondary levers of high tensile, high yield non-corrosive alloy actuates the plunger. Minimum number of parts reduces maintenance. Available in two body patterns.
Primary and secondary levers and the return spring allow free up and down movement of the valve plunger and disc. This prevents leakage of steam, water and air into the system and also prevents clogging and corrosion.
•Positive “on” and “off” control for any type of heating element or radiator
•Heavy cast brass body •Several body patterns available
•Packed Stem, Packless, and Spring Packed models
•Durable and easy to install