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455 Series

455-Series Regulator

The 455-Series Direct-Operated pressure regulator is ideally suited for reducing pressure in steam applications and requires only 5 PSIG minimum inlet pressure. Recommended for use in steam systems that contain excessive amounts of pipe scale and other contaminants that may cause failure in pilot-operated regulators.

Controlling Pressure

The 455-Series reduces downstream pressure of steam, air, or other gases. The 455-Series is installed using an external sensing line which is connected several feet downstream of the valve outlet. Downstream pressure is set by turning an adjustment screw that increases or decreases spring force on a diaphragm. The downstream pressure applies a force to the diaphragm to compress the adjustment spring. When the system pressure equals the set point, the diaphragm moves downward against the adjustment spring force closing the valve.

Design Features

The 455-Series features a rugged stainless steel balanced seat and disc design allowing these valves to be used in applicatiosn with low inlet pressure; down to 5 PSIG. The 455-Series does not contain any small pilot orifices and are therefore less susceptible to issues caused by dirt and pipe scale, that may adversely effect pilot-operated regulators.

• Operates with minimum inlet pressure of 5 PSIG
• Stainless steel internals
• Excellent for use in steam systems that contain excessive amounts of pipe scale and other contaminants
• Pressure balanced valve & seat for more precise control of downstream pressure

455-Series - How To Size

From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (steam) that meets or slightly exceeds demand requirements. Follow vertically up to determine appropriate size. When exact application values are not shown, interpolate between values. From the spring range chart, select the spring range that accommodates the required outlet set pressure.

Example

Application: 1000lbs/hr of 20 PSIG Steam reducted to 5 PSIG

Model Code: 455-16-N-65 (455-Series, 1 1/2” NPT, 1-6 PSIG spring range)

Find the inlet pressure: 20 PSIG
Next find the required regulator outlet Pressure: 5 PSIG
Follow across to the nearest capacity (Steam) that meets or slightly exceeds demand requirements: 1000 lbs/ hr (1193)
Follow vertically up to determine appropriate size: 1-1/2”
To determine actual full model code see model code chart below

Must Specify Spring Code when Ordering:

Use the 455 Spring Selection Table to specify the proper spring(s) based on valve size and reduced pressure range by Replacing the "X" with Spring Code from chart.

Steam: The 455-Series, available with Bronze and Cast Iron bodies, are ideally suited for reducing pressure in STEAM applications and requires only 5 PSIG minimum inlet pressure. Excellent for use in steam systems that contain large amounts of scale that may cause failure in pilot-operated regulators.

Size Connection PMO (PSIG) Max Capacity
1/2" - 4" NPT, FLG(125,250) 15-250 33,040 lbs/hr

ModelSizeTypeReduced Pressure Range (psig)Body MaterialMax Inlet Pressure (psig)Capacity (lb/h)
455-12-N-631/2"NPT5 - 20Stainless Steel250
455-17-F125-942"125# FLG5 - 20Iron Body250
455-12-N-611/2"NPT40 - 70Stainless Steel250
455-12-N-511/2"NPT60 - 125Stainless Steel250
455-13-N-653/4"NPT0 - 6Stainless Steel250
455-13-N-633/4"NPT5 - 20Stainless Steel250
455-13-N-623/4"NPT15 - 45Stainless Steel250
455-13-N-613/4"NPT40 - 70Stainless Steel250
455-13-N-513/4"NPT60 - 125Stainless Steel250
455-14-N-651"NPT0 - 6Stainless Steel250
455-14-N-631"NPT5 - 20Stainless Steel250
455-14-N-621"NPT15 - 45Stainless Steel250
455-14-N-611"NPT40 - 70Stainless Steel250
455-14-N-511"NPT60 - 125Stainless Steel250
455-15-N-651 1/4"NPT0 - 6Stainless Steel250
455-15-N-631 1/4"NPT5 - 20Stainless Steel250
455-15-N-621 1/4"NPT15 - 45Stainless Steel250
455-15-N-611 1/4"NPT40 - 70Stainless Steel250
455-15-N-511 1/4"NPT60 - 125Stainless Steel250
455-16-N-651 1/2"NPT0 - 6Stainless Steel250
455-16-N-631 1/2"NPT5 - 20Stainless Steel250
455-16-N-621 1/2"NPT15 - 45Stainless Steel250
455-16-N-611 1/2"NPT40 - 70Stainless Steel250
455-16-N-511 1/2"NPT60 - 125Stainless Steel250
455-17-F125-942"125# FLG5 - 20Iron Body250
455-17-F125-932"125# FLG15 - 45Iron Body250
455-17-F125-732"125# FLG40 - 70Iron Body250
455-17-F125-722"125# FLG60 - 125Iron Body250
455-17-F250-1342"250# FLG0 - 6Iron Body250
455-17-F250-942"250# FLG5 - 20Iron Body250
455-17-F250-932"250# FLG15 - 45Iron Body250
455-17-F250-732"250# FLG40 - 70Iron Body250
455-17-F250-722"250# FLG60 - 125Iron Body250
455-17-N-1342"NPT0 - 6Iron Body250
455-17-N-942"NPT5 - 20Iron Body250
455-17-N-932"NPT15 - 45Iron Body250
455-17-N-732"NPT40 - 70Iron Body250
455-17-N-722"NPT60 - 125Iron Body250
455-18-F125-1342 1/2"125# FLG0 - 6Iron Body250
455-18-F125-942 1/2"125# FLG5 - 20Iron Body250
455-18-F125-932 1/2"125# FLG15 - 45Iron Body250
455-18-F125-732 1/2"125# FLG40 - 70Iron Body250
455-18-F125-722 1/2"125# FLG60 - 125Iron Body250
455-18-F250-1342 1/2"250# FLG0 - 6Iron Body250
455-18-F250-932 1/2"250# FLG15 - 45Iron Body250
455-18-F250-732 1/2"250# FLG40 - 70Iron Body250
455-18-F250-722 1/2"250# FLG60 - 125Iron Body250
455-19-F125-1343"125# FLG0 - 6Iron Body250
455-19-F125-943"125# FLG5 - 20Iron Body250
455-19-F125-933"125# FLG15 - 45Iron Body250
455-19-F125-723"125# FLG60 - 125Iron Body250
455-19-F250-1343"250# FLG0 - 6Iron Body250
455-19-F250-943"250# FLG5 - 20Iron Body250
455-19-F250-933"250# FLG15 - 45Iron Body250
455-19-F250-733"250# FLG40 - 70Iron Body250
455-19-F250-723"250# FLG60 - 125Iron Body250
455-20-F125-1344"125# FLG0 - 6Iron Body250
455-20-F125-944"125# FLG5 - 20Iron Body250
455-20-F125-934"125# FLG15 - 45Iron Body250
455-20-F125-734"125# FLG40 - 70Iron Body250
455-20-F125-724"125# FLG60 - 125Iron Body250
455-20-F250-1344"250# FLG0 - 6Iron Body250
455-20-F250-944"250# FLG5 - 20Iron Body250
455-20-F250-934"250# FLG15 - 45Iron Body250
455-20-F250-734"250# FLG40 - 70Iron Body250
455-20-F250-724"250# FLG60 - 125Iron Body250
455-13-N-633/4"NPT5 - 20Stainless Steel250
Product Overview
The 455 Series direct-operated pressure regulatoring 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.
Features
• Operates with minimum inlet pressure of 5 PSIG
• Stainless steel internals
• Excellent for use in steam systems that contain excessive amounts of pipe scale and other contaminants
• Pressure balanced valve & seat for more precise control of downstream pressure
Selection / Sizing / Capacities

From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (steam) that meets or slightly exceeds demand requirements. Follow vertically up to determine appropriate size. When exact application values are not shown, interpolate between values. From the spring range chart, select the spring range that accommodates the required outlet set pressure.

455 Spring Selection Table:

Example:
Application: 1000 lbs/hr of 20 PSIG Steam reduced to 5 PSIG
Model Code: 455-16-N-65 (455-Series, 11/2” NPT, 1-6 PSIG spring range)

Dimension and Weights