SUBSEA DOUBLE EXPANDING GATE VALVE

Subsea double expanding gate valves are designed according to API6DSS, API6A, API17D with the addition of customer requirements when present. The valves do not rely on lubricant or grease to assist sealing between the gates and seats. Metal-to-metal sealing is used between the gate and seat and between the seat and body. Metal-to-metal sealing is also provided between body-to-bonnet. The Subsea double expanding gate valves are actuated by hydraulic actuator or gearbox as requested.

BASIC CHARACTERISTICS

  • API6DSS, API6A, API17D design as requested
  • Bi-directional sealing
  • Floating metal-to-metal seats (tungsten carbide coating)
  • Non-elastomeric seals to avoid the risk of gradual degradation of the seals over their life
  • Full metal-to-metal sealing at any primary pressure boundary
  • In both open and closed positions, the expansion of the gate creates a tight seal against the upstream and downstream seats
  • Forged material to comply with API6A PSL3
  • Valve actuation with dedicated hydraulic actuator and ROV operable Gearbox

OTHER CHARACTERISTICS

900-1500 lbs / 3000 psi5000 psi / 2500 lbs7500 psi10000 psi15000 psi
½”-1”StandardStandardStandardStandardStandard
1 13/16”StandardStandardStandardStandardStandard
2 1/16”StandardStandardStandardStandardStandard
3 1/8”StandardStandardStandardStandardStandard
4 1/16”StandardStandardStandardStandardStandard
5 1/8”StandardStandardStandardStandardStandard
7 1/16”StandardStandardStandardStandardStandard
9”StandardStandardStandardStandard
11”StandardStandardStandardStandard
13 5/8”StandardStandardStandardStandard
FeaturesFeatures
Primary Metal SeatStandardFSC, DA, FSO valve designStandard
Primary Metal Seals (BX)StandardSeal Areas OverlayStandard
Diver, ROV or ActuatedAs RequestedWetted Areas OverlayOn Request
Hybrid Gate valve (Metal SR/Soft DPE)On RequestElectrical ContinuityStandard
B&B, DB&B, DI&BStandardAPI6A/API17D/API6DSS qualificationAs Requested
BODY, BONNET, PUPS
  • ASTM A350-LF2 + Inconel 625 overlay
  • ASTM A694-F52/F56/F60/F65 + Inconel 625 overlay
  • ASTM A182-F22 + Inconel 625 overlay
  • Duplex 22% Cr
  • Superduplex 25% Cr
  • Inconel 625
TRIM (SEAT, GATE AND STEM)
  • ASTM A350-LF2 + Inconel 625 overlay
  • ASTM A694-F52/F56/F60/F65 + Inconel 625 overlay
  • Duplex 22% Cr
  • Superduplex 25% Cr
  • Inconel 625
  • Inconel 718
BODY SEALS / SEAT SEALS
  • METAL GASKET (BX type gasket)
  • LIPSEAL– PTFE + ELGILOY
  • V – PACK – PTFE + PEEK + ELGILOY
  • OR – HNBR AED (for seawater sealing)
SEAT INSERT
  • METAL WITH TUNGSTEN CARBIDE COATING
  • PEEK / PCTFE / PTFE (back insert)
BOLTING
  • ASTM A320-L7 / A193-B7 (XYLAN COATED, NICKEL/ZINC PLATED)
  • ASTM A320-L7M / A193-B7M (XYLAN COATED, NICKEL/ZINC PLATED)
  • ASTM A453-GR.660 (XYLAN COATED)
  • UNS S32760 (25% Cr)

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