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403 Series (for Gas)

403 Piston-Actuated Pilot-Operated

The 403 piston-actuated pressure regulating are pilot-operated, piston-actuated, pressure regulators primarily used for reducing pressure in STEAM systems. These regulators can be equipped with an optional internal sensing line which simplifies installation (Suffix I). The 403 Series has all stainless steel internals for high-pressure applications up to 450 PSIG. Double Spring Option is available for wider range of reduced pressures.

Design Features

  • The 403-series Pilot operated regulator minimizes outlet pressure fluctuations even when load varies

  • Internal Sensing option (if requested , the regulator can be modified to internally sense pressure , eliminating the need for an external sensing line

  • Ductile Iron body to handle increased temperature and pressure up to 450 PSI

  • Hardened 420 SS seat and discs for extended service life

Controlling Pressure

The 403 piston-actuated pressure regulating valves contain a separate pilot valve which is mounted on top of the main valve. The valve senses the downstream pressure (low pressure side) and precisely modulates a small amount of steam from the upstream side (high pressure side) to the top of the piston chamber, which in turn controls the opening of the main valve. When steam demand increases and downstream pressure starts to drop, the valve is opened further, allowing for additional flow. These regulators have increased accuracy and consistency of set pressure when compared to the Direct-operated type. Set pressure is more stable and will only vary a few percent over the full flow range.

How To Size for 403-Series

From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (Air) 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: 3,500 SCFM of 300 PSIG Air reduced to 125 PSIG

Model Code: 403-17-N-0010-R (2” 403 Series Valve, 100-200 PSIG spring range, with external sensing)

Find the inlet pressure: 300 PSIG
Next find the required regulator outlet Pressure: 125 PSIG (0-150)
Follow across to the nearest capacity (Air) that meets or slightly exceeds demand requirements: 3,500 SCFM (4940)
Follow vertically up to determine appropriate size: 2”
To determine actual full model code see model code chart below

Must Specify Spring Code when Ordering:

Use the 403 Series 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.

Air: The 403 Series pilot-operated (piston-actuated) pressure regulating valves are used for pressure reduction on steam mains and other process equipment. Piston-actuated regulators are more compact than Diaphragm-actuated regulators. The 403 Series has a Ductile Iron body but contains all stainless steel internals for high-pressure applications up to 450 PSIG.

Size Connection PMO (PSIG) Max Capacity
1/2" - 4" NPT, FLG(150,300) 20-450 Gases - 27,538 SCFM.

ModelSizeTypeSpring TypeReduced Pressure Range (psig)Pressure Sensing TypeMax Inlet Pressure (psig)Capacity (scfm)
403-12-N-0013-R1/2"NPTSingle0 - 10Remote450
403-12-N-0014-R1/2"NPTSingle10 - 50Remote450
403-12-N-0009-R1/2"NPTSingle40 - 100Remote450
403-12-N-0010-R1/2"NPTSingle100 - 200Remote450
403-12-N-0910-R1/2"NPTDouble50 - 200Remote450
403-12-N-1409-R1/2"NPTDouble30 - 125Remote450
403-12-N-0013-I1/2"NPTSingle0 - 10Internal450
403-12-N-0014-I1/2"NPTSingle10 - 50Internal450
403-12-N-0009-I1/2"NPTSingle40 - 100Internal450
403-12-N-0010-I1/2"NPTSingle100 - 200Internal450
403-12-N-0910-I1/2"NPTDouble50 - 200Internal450
403-12-N-1409-I1/2"NPTDouble30 - 125Internal450
403-13-N-0013-R3/4"NPTSingle0 - 10Remote450
403-13-N-0014-R3/4"NPTSingle10 - 50Remote450
403-13-N-0009-R3/4"NPTSingle40 - 100Remote450
403-13-N-0010-R3/4"NPTSingle100 - 200Remote450
403-13-N-0910-R3/4"NPTDouble50 - 200Remote450
403-13-N-1409-R3/4"NPTDouble30 - 125Remote450
403-13-N-0013-I3/4"NPTSingle0 - 10Internal450
403-13-N-0014-I3/4"NPTSingle10 - 50Internal450
403-13-N-0009-I3/4"NPTSingle40 - 100Internal450
403-13-N-0010-I3/4"NPTSingle100 - 200Internal450
403-13-N-0910-I3/4"NPTDouble50 - 200Internal450
403-13-N-1409-I3/4"NPTDouble30 - 125Internal450
403-14-N-0013-R1"NPTSingle0 - 10Remote450
403-14-N-0014-R1"NPTSingle10 - 50Remote450
403-14-N-1409-R1"NPTDouble30 - 125Remote450
403-14-N-0009-R1"NPTSingle40 - 100Remote450
403-14-N-0910-R1"NPTDouble50 - 200Remote450
403-14-N-0010-R1"NPTSingle100 - 200Remote450
403-14-N-0013-I1"NPTSingle0 - 10Internal450
403-14-N-0014-I1"NPTSingle10 - 50Internal450
403-14-N-1409-I1"NPTDouble30 - 125Internal450
403-14-N-0009-I1"NPTSingle40 - 100Internal450
403-14-N-0910-I1"NPTDouble50 - 200Internal450
403-14-N-0010-I1"NPTSingle100 - 200Internal450
403-15-N-0013-R1 1/4"NPTSingle0 - 10Remote450
403-15-N-0014-R1 1/4"NPTSingle10 - 50Remote450
403-15-N-1409-R1 1/4"NPTDouble30 - 125Remote450
403-15-N-0009-R1 1/4"NPTSingle40 - 100Remote450
403-15-N-0910-R1 1/2"NPTDouble50 - 200Remote450
403-15-N-0010-R1 1/4"NPTSingle100 - 200Remote450
403-15-N-0013-I1 1/4"NPTSingle0 - 10Internal450
403-15-N-0014-I1 1/4"NPTSingle10 - 50Internal450
403-15-N-1409-I1 1/4"NPTDouble30 - 125Internal450
403-15-N-0009-I1 1/4"NPTSingle40 - 100Internal450
403-15-N-0910-I1 1/4"NPTDouble50 - 200Internal450
403-15-N-0010-I1 1/4"NPTSingle100 - 200Internal450
403-16-N-0013-R1 1/2"NPTSingle0 - 10Remote450
403-16-N-0014-R1 1/2"NPTSingle10 - 50Remote450
403-16-N-1409-R1 1/2"NPTDouble30 - 125Remote450
403-16-N-0009-R1 1/2"NPTSingle40 - 100Remote450
403-16-N-0910-R1 1/2"NPTDouble50 - 200Remote450
403-16-N-0010-R1 1/2"NPTSingle100 - 200Remote450
403-16-N-0013-I1 1/2"NPTSingle0 - 10Internal450
403-16-N-0014-I1 1/2"NPTSingle10 - 50Internal450
403-16-N-1409-I1 1/2"NPTDouble30 - 125Internal450
403-16-N-0009-I1 1/2"NPTSingle40 - 100Internal450
403-16-N-0910-I1 1/2"NPTDouble50 - 200Internal450
403-16-N-0010-I1 1/2"NPTSingle100 - 200Internal450
403-17-N-0013-R2"NPTSingle0 - 10Remote450
403-17-N-0014-R2"NPTSingle10 - 50Remote450
403-17-N-0009-R2"NPTSingle40 - 100Remote450
403-17-N-0010-R2"NPTSingle100 - 200Remote450
403-17-N-0910-R2"NPTDouble50 - 200Remote450
403-17-N-1409-R2"NPTDouble30 - 125Remote450
403-17-N-0013-I2"NPTSingle0 - 10Internal450
403-17-N-0014-I2"NPTSingle10 - 50Internal450
403-17-N-0009-I2"NPTSingle40 - 100Internal450
403-17-N-0010-I2"NPTSingle100 - 200Internal450
403-17-N-0910-I2"NPTDouble50 - 200Internal450
403-17-N-1409-I2"NPTDouble30 - 125Internal450
403-17-F150-0013-R2"150# FLGSingle0 - 10Remote450
403-17-F150-0014-R2"150# FLGSingle10 - 50Remote450
403-17-F150-0009-R2"150# FLGSingle40 - 100Remote450
403-17-F150-0010-R2"150# FLGSingle100 - 200Remote450
403-17-F150-0910-R2"150# FLGDouble50 - 200Remote450
403-17-F150-1409-R2"150# FLGDouble30 - 125Remote450
403-17-F150-0013-I2"150# FLGSingle0 - 10Internal450
403-17-F150-0014-I2"150# FLGSingle10 - 50Internal450
403-17-F150-0009-I2"150# FLGSingle40 - 100Internal450
403-17-F150-0010-I2"150# FLGSingle100 - 200Internal450
403-17-F150-0910-I2"150# FLGDouble50 - 200Internal450
403-17-F150-1409-I2"150# FLGDouble30 - 125Internal450
403-17-F300-0013-R2"300# FLGSingle0 - 10Remote450
403-17-F300-0014-R2"300# FLGSingle10 - 50Remote450
403-17-F300-0009-R2"300# FLGSingle40 - 100Remote450
403-17-F300-0010-R2"300# FLGSingle100 - 200Remote450
403-17-F300-0910-R2"300# FLGDouble50 - 200Remote450
403-17-F300-1409-R2"300# FLGDouble30 - 125Remote450
403-17-F300-0013-I2"300# FLGSingle0 - 10Internal450
403-17-F300-0014-I2"300# FLGSingle10 - 50Internal450
403-17-F300-0009-I2"300# FLGSingle40 - 100Internal450
403-17-F300-0010-I2"300# FLGSingle100 - 200Internal450
403-17-F300-0910-I2"300# FLGDouble50 - 200Internal450
403-17-F300-1409-I2"300# FLGDouble30 - 125Internal450
403-18-F150-0013-R2 1/2"150# FLGSingle0 - 10Remote450
403-18-F150-0014-R2 1/2"150# FLGSingle10 - 50Remote450
403-18-F150-0009-R2 1/2"150# FLGSingle40 - 100Remote450
403-18-F150-0010-R2 1/2"150# FLGSingle100 - 200Remote450
403-18-F150-0910-R2 1/2"150# FLGDouble50 - 200Remote450
403-18-F150-1409-R2 1/2"150# FLGDouble30 - 125Remote450
403-18-F150-0013-I2 1/2"150# FLGSingle0 - 10Internal450
403-18-F150-0014-I2 1/2"150# FLGSingle10 - 50Internal450
403-18-F150-0009-I2 1/2"150# FLGSingle40 - 100Internal450
403-18-F150-0010-I2 1/2"150# FLGSingle100 - 200Internal450
403-18-F150-0910-I2 1/2"150# FLGDouble50 - 200Internal450
403-18-F150-1409-I2 1/2"150# FLGDouble30 - 125Internal450
403-18-F300-0013-R2 1/2"300# FLGSingle0 - 10Remote450
403-18-F300-0014-R2 1/2"300# FLGSingle10 - 50Remote450
403-18-F300-0009-R2 1/2"300# FLGSingle40 - 100Remote450
403-18-F300-0010-R2 1/2"300# FLGSingle100 - 200Remote450
403-18-F300-0910-R2 1/2"300# FLGDouble50 - 200Remote450
403-18-F300-1409-R2 1/2"300# FLGDouble30 - 125Remote450
403-18-F300-0013-I2 1/2"300# FLGSingle0 - 10Internal450
403-18-F300-0014-I2 1/2"300# FLGSingle10 - 50Internal450
403-18-F300-0009-I2 1/2"300# FLGSingle40 - 100Internal450
403-18-F300-0010-I2 1/2"300# FLGSingle100 - 200Internal450
403-18-F300-0910-I2 1/2"300# FLGDouble50 - 200Internal450
403-18-F300-1409-I2 1/2"300# FLGDouble30 - 125Internal450
403-19-F150-0013-R3"150# FLGSingle0 - 10Remote450
403-19-F150-0014-R3"150# FLGSingle10 - 50Remote450
403-19-F150-0009-R3"150# FLGSingle40 - 100Remote450
403-19-F150-0010-R3"150# FLGSingle100 - 200Remote450
403-19-F150-0910-R3"150# FLGDouble50 - 200Remote450
403-19-F150-1409-R3"150# FLGDouble30 - 125Remote450
403-19-F150-0013-I3"150# FLGSingle0 - 10Internal450
403-19-F150-0014-I3"150# FLGSingle10 - 50Internal450
403-19-F150-0009-I3"150# FLGSingle40 - 100Internal450
403-19-F150-0010-I3"150# FLGSingle100 - 200Internal450
403-19-F150-0910-I3"150# FLGDouble50 - 200Internal450
403-19-F150-1409-I3"150# FLGDouble30 - 125Internal450
403-19-F300-0013-R3"300# FLGSingle0 - 10Remote450
403-19-F300-0014-R3"300# FLGSingle10 - 50Remote450
403-19-F300-0009-R3"300# FLGSingle40 - 100Remote450
403-19-F300-0010-R3"300# FLGSingle100 - 200Remote450
403-19-F300-0910-R3"300# FLGDouble50 - 200Remote450
403-19-F300-1409-R3"300# FLGDouble30 - 125Remote450
403-19-F300-0013-I3"300# FLGSingle0 - 10Internal450
403-19-F300-0014-I3"300# FLGSingle10 - 50Internal450
403-19-F300-0009-I3"300# FLGSingle40 - 100Internal450
403-19-F300-0010-I3"300# FLGSingle100 - 200Internal450
403-19-F300-0910-I3"300# FLGDouble50 - 200Internal450
403-19-F300-1409-I3"300# FLGDouble30 - 125Internal450
403-20-F150-0013-R4"150# FLGSingle0 - 10Remote450
403-20-F150-0014-R4"150# FLGSingle10 - 50Remote450
403-20-F150-0009-R4"150# FLGSingle40 - 100Remote450
403-20-F150-0010-R4"150# FLGSingle100 - 200Remote450
403-20-F150-0910-R4"150# FLGDouble50 - 200Remote450
403-20-F150-1409-R4"150# FLGDouble30 - 125Remote450
403-20-F150-0013-I4"150# FLGSingle0 - 10Internal450
403-20-F150-0014-I4"150# FLGSingle10 - 50Internal450
403-20-F150-0009-I4"150# FLGSingle40 - 100Internal450
403-20-F150-0010-I4"150# FLGSingle100 - 200Internal450
403-20-F150-0910-I4"150# FLGDouble50 - 200Internal450
403-20-F150-1409-I4"150# FLGDouble30 - 125Internal450
403-20-F300-0013-R4"300# FLGSingle0 - 10Remote450
403-20-F300-0014-R4"300# FLGSingle10 - 50Remote450
403-20-F300-0009-R4"300# FLGSingle40 - 100Remote450
403-20-F300-0010-R4"300# FLGSingle100 - 200Remote450
403-20-F300-0910-R4"300# FLGDouble50 - 200Remote450
403-20-F300-1409-R4"300# FLGDouble30 - 125Remote450
403-20-F300-0013-I4"300# FLGSingle0 - 10Internal450
403-20-F300-0014-I4"300# FLGSingle10 - 50Internal450
403-20-F300-0009-I4"300# FLGSingle40 - 100Internal450
403-20-F300-0010-I4"300# FLGSingle100 - 200Internal450
403-20-F300-0910-I4"300# FLGDouble50 - 200Internal450
403-20-F300-1409-I4"300# FLGDouble30 - 125Internal450
Product Overview
The 403 Series pilot-operated (piston-actuated) pressure regulating valves are used for pressure reduction on steam mains and other process equipment. Pilot-operated regulators will maintain a constant and accurate downstream pressure regardless of fluctuations in supply pressure or usage. These regulators can be supplied with an optional internal sensing line which simplifies installation. Piston-actuated regulators are more compact than Diaphragm-actuated regulators. The 403 Series contains all stainless steel internals for high-pressure applications up to 450 PSIG. The Double-Spring option is available for a wider range of reduced pressures.

403 Spring Selection Table (Internal Sensing - not available with 0 - 10 PSI range)
Features
• Pilot-operated regulators minimize outlet pressure fluctuations even when load varies
• Internal Sensing option (If requested, the regulator can be modified to internally sense pressure, eliminating the need for an external sensing line)
• Ductile Iron body to handle increased pressure and temperature
• Hardened stainless steel seat and disc (55 Rc)
Selection / Sizing / Capacities
From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (steam, air) 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. Specify Internal or External (remote) Pressure sensing.

Example:
Application:  12,500 lbs/hr of 300 PSIG Steam reduced to 125 PSIG
Model Code: 403-17-N-0010-R (2” 403 Series Valve, 100-200 PSIG spring range, with external sensing
How It Works

Pressure Reducing Station with External Sensing Line

External Sensing (standard)
(requires sensing line)
 

Pressure Reducing Station with Internal Sensing Line

Internal Sensing Option
(Specially drilled internal sensing path eliminates the need for an external sensing line)

Dimension and Weights