Products
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  • 403-400x400
  • 403-B-400x400
  • 403-C-400x400
Technical Specification
  
ServiceSteam, Air
Size2"
Connection150# FLG
Reduced Pressure Range (psig)0 - 10
Max. Inlet Pressure (psig)450
Min. Inlet Pressure (psig)20
Max. Differential Pressure (psig)250
Min. Differential Pressure (psig)15% of Inlet Pressure (10 PSI min)
Material Specification
  
BodyDuctile Iron
SeatHardened 420 Stainless Steel(55 Rc)
DiscHardened 420 Stainless Steel(55 Rc)
InternalsStainless Steel
403-17-F150-0013-R
QTY :
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.
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