The Model POSR-1 is primarily a pilot operated steam regulator. The
external pilot valve is supplied from a main valve body tapped connection. Sizes are 1/2", 3/4" and 1" (DN15, 20 and 25). Handles pressure drops up to 200 psi (13.8 Bar) with adjustable outlet pressures between 5 and 150 psig (.34 and 10.3 Barg). Also available without the pilot as a pressure loaded steam regulator. The pilot uses a bellows as a frictionless seal for the pilot valve plug. It was incorporated to ensure that the pilot maintains its sensitivity and smooth operation in older steam systems that are chemically treated and systems that are used intermittently.