403 Series Pressure Regulating Valve

Brand: Watson McDaniel

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 psi: 0 to 400 (kPa: 0 to 2,758, bar: 0 to 27.58). 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)

Specifications

Enclosure, Body Material

  • Ductile Iron

Flange Size - 2-1/2” (DN 65)

  • 2-1/2” (DN 65) - 150#
  • 2-1/2” (DN 65) - 300#

Flange Size - 2” (DN 50)

  • 2” (DN 50) - 150#
  • 2” (DN 50) - 300#

Flange Size - 3” (DN 80)

  • 3” (DN 80) - 150#
  • 3” (DN 80) - 300#

Flange Size - 4” (DN 100)

  • 4” (DN 100) - 150#
  • 4” (DN 100) - 300#

NPT Connection

  • 1” NPT
  • 1/2” NPT
  • 1-1/2” NPT
  • 1-1/4” NPT
  • 2” NPT
  • 2-1/2” NPT
  • 3” NPT
  • 3/4” NPT
  • 4” NPT

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