CAST STEEL DUAL DISC CHECK VALVE WAFER STYLE (Dual Plate)


  • This is the preferred valve for installations where weight reduction of system structures is required or where spacing problems occur in comparison to other similar type valves.
  • They are also used to prevent backflow.
  • Widely used on offshore platforms for the extraction of crude oil, gas and their derivatives.
  • Design in accordance with API-594 Type A.
  • ASME Classes 150, 300, 600, 900, 1500 and 2500.


OVERVIEW

This is the preferred valve for installations where weight reduction of system structures is required or where spacing problems occur in comparison to other similar type valves.

DESIGN FEATURES

CAST STEEL DUAL DISC CHECK VALVE WAFER STYLE (Dual Plate)

  1. Wafer type design in accordance with API-594 Type A.
  2. Wafer style body produced by lost wax casting process from NPS 2 to NPS 12; NPS 14 and above by hard sand process (no bake process).
  3. Two half discs (dual plate).
  4. NPS 2 - NPS 48 diameters.
  5. Inside in accordance with API-594 published tables.
  6. RF or RTJ ends in accordance with API-594; RF or RTJ flange finishes in accordance with ASME B16.5 from NPS 2 to NPS 24; for NPS 26 valves and ASME B16.47 Series A major flanges.
  1. Flange end spacing in accordance with API-594 table 2.
  2. Fixed seat with weld overlap in the sealing area (overlapping).
  3. Classes 150, 300, 600, 900, 1500 and 2500 #.
  4. Shaft and stop bolt internally body-bound to prevent leakage to atmosphere.
  5. 2 internal supports.
  6. Tightening screws.
  7. Inconel X-750 spring; in NPS 8 and larger valves with two springs.
  8. Performance testing in accordance with standard API-598.
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