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.

Model 461-57S
Body Sizes = 2” Screwed End, 2” Flanged in ANSI 125, 250, 300 & 600 RF
Max Inlet Pressure = 175 psi up to 1000 psi
Outlet Pressure Range = 3 psi - 100 psi

Model 441-57S
Body Sizes = 2” Screwed End, 2”, 3”, 4” & 6” Flanged in ANSI 125, 250, and 300 RF
Max Inlet Pressure = 175 psi up to 1000 psi
Outlet Pressure Range = 3 psi – 100 psi