Watson McDaniel Pressure Regulating Valve, 455 Series

Watson McDaniel Pressure Regulating Valve, 455 Series

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The 455 Series direct-operated pressure regulating valves are used for pressure reduction applications on steam, air and other gases. Balanced seat and disc design allows these valves to be used in applications with low inlet pressure; down to 5 PSIG. Unlike pilot-operated valves, the 455 does not contain any small pilot orifices and are therefore less susceptible to issues caused by dirt and pipe scale. The 455-Series is installed using an external sensing line which is connected several feet downstream of the valve. Placing the pressure sensing location out of range of valve discharge turbulence makes it more accurate in controlling downstream pressure.

455 Series Spec Sheet


Model 455-17, 455-20
Service Steam, Air & Other Gasses
Sizes 2", 4"
Connections 125# FLG
Body Material Cast Iron
Seat & Disc Stainless Steel
Diaphragm Neoprene/Nylon
Max Inlet Pressure 250 PSIG
Min Inlet Pressure 5 PSIG
Max Differential Pressure 125 PSI
Min Differential Pressure 20% of Inlet Pressure