DOUBLE EXPANDING GATE VALVE


  • It is used in critical services where it is imperative to have an effective system isolation or as an emergency stop valve; for transporting crude oil, gas, oil and its derivatives. An example is the separation stations.
  • Design in accordance with API-6D and ISO-14313.
  • Also compliant with PEMEX EST-0211/002 requirements.
  • ASME Classes 150, 300, 600, 900, 1500 and 2500


OVERVIEW

It is used in critical services where it is imperative to have an effective system isolation or as an emergency stop valve; for transporting crude oil, gas, oil and its derivatives. An example is the separation stations.

DESIGN FEATURES

DOUBLE EXPANDING GATE VALVE.

  1. Design in accordance with API-6D and ISO-14313.
  2. Completely continuous flow to minimize pressure drop and allow inspection or cleaning tools (pigs) through.
  3. Two-piece shutter consisting of gate and expansion segment (expandable).
  4. Standard internal arrangement with soft rubber gaskets, chosen depending on service conditions (pressure, temperature).
  5. Standard internal arrangement with metal-to-metal seals or double seals (PMSS) available upon request.
  6. Plug (gate and segment), stem and seat rings coated with ENP (Electroless Nickel Platted) with a minimum thickness of 0.003" for increased wear resistance.
  7. Hinged arm guides in 304 stainless steel material.
  8. Arm drive screws in 17-4pH H-1150 material for increased mechanical strength.
  9. Double block and bleed (DBB).
  10. Bidirectional seats.
  11. Handwheel operation on small diameters and gear operator on large diameters.
  1. Lubricant / sealant injectors in SS-304 material connected to the seat rings.
  2. Tiger Pack type sealant injector in SS-304 material connected to the packing chamber.
  3. NPS 2 - NPS 48 diameters.
  4. RF or RTJ finishes in accordance with ASME B16.5 from NPS 1 to NPS 24; for NPS 26 and larger valves, ASME B16.47 Series A flanges as standard.
  5. For WE end valves in accordance with ASME B16.25.
  6. Flange end spacing in accordance with API-6D (Table C.1) Valve dimensions not listed in API-6D in accordance with ASME B16.10.
  7. Classes 150, 300, 600, 900, 1500 and 2500 #.
  8. Suitable for corrosive service in accordance with NACE MR-01-75 or NACE MR-01-03.
  9. Flame-retardant design under API-6FA ("Standard for Fire Test for Valves") and API-607 ("Fire Test for Quarter Turn Valves and Valves Equipped with Non-Metallic Seals").
  10. Overpressure release and bypass device.
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