MEPCO Regulating Valve SWRF C combines the advantages of a spring-packed radiator valve and an adjustable regulating fitting. This valve is applicable to vacuum return line steam heating systems with pressures of 25″ Hg vacuum to 25 PSIG. It provides both a positive “on” or “off” control and accurate proportioning of steam to a convector or radiator. When balancing steam distribution in a heating system, this valve eliminates the lengthy procedure of changing regulating plates (a process that requires the valve unions to be disconnected and then reconnected).