NSW API 6D Swing Check Valve – Class 150–2500, WCB/CF8M Body, Bolted or Pressure Seal Cover

The NSW API 6D Swing Check Valve is a robust, full-bore or reduced-bore non-return valve designed to allow unidirectional fluid flow while preventing backflow in process pipelines. Built to API 6D and BS 1868 standards, it is engineered for high-integrity applications in oil & gas, petrochemical, power generation, and industrial fluid systems.

This valve employs a rocker-arm swing mechanism enclosed entirely within the body. The disc swings open with forward flow and closes automatically on reverse flow. A spherical joint between the disc and rocker ensures 360° freedom of movement, allowing slight alignment adjustments for optimal sealing. The body is offered in cast carbon steel, stainless steel, or high alloy materials, and end connections include RF/RTJ flanges or butt welds as per ASME standards.

Options include bolted covers for easy maintenance or pressure seal bonnets for high-pressure applications. Fire-safe construction, NACE compliance, and non-destructive testing options ensure suitability for critical isolation duties across a wide range of fluids, including water, oil, steam, acids, and oxidizing media.

Specifications:

– Valve Type: Swing Check Valve (Non-Return Type)
– Operation: Automatic (non-actuated, flow-responsive)
– Size Range: NPS 2" to NPS 48"
– Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
– Bore Options: Full Bore / Reduced Bore
– Cover Type: Bolted Cover / Pressure Seal Cover
– Body Materials:
  – Cast Carbon Steel: ASTM A216 WCB
  – Stainless Steel: ASTM A351 CF8, CF8M, CF3, CF3M
  – Low-Temp Carbon Steel: A352 LCB, LCC, LC2
  – Duplex & Super Duplex: A995 4A, 5A
  – Special Alloys: Monel, Inconel, Hastelloy, UB6
– Disc Design: Rocker Arm with Spherical Hinge
– End Connections:
  – Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ) Flanges (ASME B16.5 / B16.47)
  – Butt Weld (ASME B16.25)
  – (NPS 22 flange per MSS SP-44)
– Face-to-Face Dimensions: API 6D, ASME B16.10
– Design Standards: API 6D, BS 1868
– Testing Standards: API 598, API 6D
– Fire Safe Design: API 6FA, API 607
– Optional Compliance:
  – NACE MR-0175 / MR-0103
  – ISO 15848 (Fugitive Emissions)
  – Non-Destructive Tests: PMI, UT, RT, PT, MT
– Installation Orientation: Typically horizontal (recommended)
– Media Compatibility: Water, steam, crude oil, refined petroleum, nitric acid, acetic acid, oxidizers, urea
– Applications: Oil & gas pipelines, chemical plants, power stations, fertilizer and pharmaceutical industries
– Temperature Range: Based on material, typically -46°C to +200°C

For further specifications or to inquire about this equipment and ReflowX's logistics services, Please contact ReflowX at info@reflowx.com