For body types, maximum body working pressures, spring ranges, maximum inlet pressures and more, download the data sheet.
Our Model 461-57S and Model 441-57S medium pressure regulators are spring-operated regulators that incorporate a “roll-out” diaphragm, similar to the performance found in pilot-operated regulators.
The action of the roll-out diaphragm reduces “droop” (the fall off in outlet pressure as a spring regulator opens to increase flow). This makes the regulators’ exceptional performance possible. By offering near-pilot-operated regulator performance without a pilot, the 57S-series regulators offer simplicity, dependability and exceptionally fast response.
Both models are perfect for most intermediate and large-capacity applications:
These workhorses of the industry have been recognized for their dependable service for nearly 70 years.