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iRSVP® 4500

Drain and vent valves for power applications

ASME 4500 Limited Class: Engineered for Extreme Conditions

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  • Integral vented body design allows installation per ASME B31.1 PWHT requirements
  • Standard four-year warranty; one-year warranty on high-cycle applications (1 cycle per day, 365 days per year)
  • Patented design
Ball and Seats
  • Mate lapped for 100% contact
  • Ensures absolute shutoff
  • Corrosion resistant
  • Seats are protected from flow in open / closed position
  • Withstands thermal shock
  • Handles high cycling applications
  • High strain to fracture
  • Maintains strength of base metal
  • Erosion resistant
Rigid Mounting Bracket

Designed to support actuator in any position

Stem & Packing Arrangement
  • Live loading
  • Quarter-turn non-rising stem does not deteriorate packing
  • Extensive stuffing box
  • Dual anti-extrusion rings keep packing in place
Mechanical Precision Stop
  • Prevents turning ball 180°
  • Eliminates misalignment
Seat Spring

Assisted by line pressure, provides a constant mechanical force on ball against seat to maintain seal

Power Generation
  • Boiler drains
  • Turbine drains
  • Above and below seat drains
  • Feedwater drains
  • Steam drum vents
  • Superheater vents and drains
  • Sootblower isolation
  • Isolation valve for bypass lines
  • Economizer header drains
End Connections
  • Socketweld
  • Buttweld
  • Flanged (upon request)

3/4 to 2-1/2 inch

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