Meridian™ API 6D Check Valve

General Features

  • Firesafe design
  • Standard valves meet NACE
  • Full-port piggable
  • In-line repairable
  • Bleed Plug on cover (to confirm pressure relief prior to servicing)
  • Support feet on 6” and larger
  • Lifting eye bolts on 4” and larger
  • Suitable for horizontal and vertical (flow-up) installation. Engineering review of process conditions required for vertical installation.
  • Raised boss provided for optional drain plug
  • Standard document package BS/EN 10204-3.1
  • All O-rings are AED (anti-explosive decompression) design

Cover Features

  • Independent dual cover seals (non-pressure seal design)
  • Pressure seal cover standard for larger/high pressure valves
    • 10” and larger ASME 1500
    • 8” and larger ASME 2500

Seat Design Features

  • Full stainless steel seat (ASTM A182 F316)
  • Forged steel disc (cast for sizes >4”) with 316 overlay
    on sealing area
  • Replaceable O-ring in seat protected from upstream flow
  • Dovetail groove to keep O-ring firmly in place
  • Threaded in replaceable seat

Optional Features

  • External lever arm and weight (design changes apply, additional information available on request)
  • Tapped drain plug

Reference Standards

Design Standard:

  • API 6D
  • CSA Z245.15

Face to Face:

  • ASME B16.10


  • ASME B16.5


  • MSS SP-25


  • API 598

Pressure & Temp.:

  • ASME B16.34


  • MSS SP-55

Fire Safe Design:

  • ISO 10497


  • NACE MR 0175
  • ISO 15156

Pressure Testing:

  • API 6D