NPS 4″ Class 150 BW API Cast Steel Swing Check Valve – CF8M – Bolted Cover
NPS 4″ Class 150 BW API Cast Steel Swing Check Valve – CF8M – Bolted Cover - Image 2
Internal cross-section view of a cast steel swing check valve highlighting the disc swing arm mechanism and bolted cover sealing - Xiamen Gute Valve
NPS 4″ Class 150 BW API Cast Steel Swing Check Valve – CF8M – Bolted Cover - Image 4
NPS 4″ Class 150 BW API Cast Steel Swing Check Valve – CF8M – Bolted Cover - Image 5

NPS 4″ Class 150 BW API Cast Steel Swing Check Valve – CF8M – Bolted Cover

Automatic NPS 4″ Class 150 Cast Steel Swing Check Valve in CF8M. BS 1868 / API 6D / ASME B16.34 compliant, unrestricted full-port flow path, Stellite hardfaced seat, robust reverse-flow protection.

Technical Specifications
Size NPS 4″
Pressure Class Class 150
Body Material CF8M
Connection End BW
SKU: ASCV-150-BC-CF8M-4-BW Category:

Description

The NPS 4″ Class 150 Cast Steel Swing Check Valve (CF8M) is an automatic backflow prevention valve manufactured by XIAMEN GUTE VALVE MANUFACTURING COMPANY in strict accordance with BS 1868 / API 6D / ASME B16.34. Designed for desalination seawater intake lines, petrochemical transfer corridors, and critical reverse-flow isolation grids (NPS 4″ Class 150 CF8M), this valve utilizes a hinged disc mechanism that swings open under forward media pressure and automatically closes upon flow cessation to protect pumps and upstream equipment.

Technical Specification Matrix (ASCV-150-BC-CF8M-4-BW)

Nominal Size / Bore NPS 4″ (Full Port Design)
Pressure Rating / Class Class 150
Design Standard BS 1868 / API 6D / ASME B16.34
Face-to-Face Sizing ASME B16.10 / API 6D
End Connection Topology ASME B16.5 Raised Face (RF), RTJ, or Butt Weld (BW)
Pressure Boundary Metallurgy ASTM A351 CF8M Cast Austenitic Stainless Steel (AISI 316 grade, delivering superior pitting and corrosion resistance against aggressive chemical process streams and seawater)
Disc & Body Seat Trim Hinged Disc with Stellite® Cobalt-Base Hardfaced Body Seat
Pressure Testing Mandate API 598 / BS 1868 Low-Pressure Backflow Sealing Test
Traceability & Certification EN 10204 3.1 Mill Test Certificate & PMI XRF Analysis Included

Engineering & Structural Architecture (NPS 4″)

  • Unrestricted Full-Port Flow Path: Designed with an internal waterway area matching the nominal pipe size, minimizing turbulence and pressure drop during peak flow conditions.
  • Stellite Hardfaced Seating Faces: Seating surfaces are overlaid with cobalt-base Stellite alloy, preventing wire-drawing and mechanical wear during repetitive closing impacts.
  • Robust Hinge Pin Design: Enclosed hinge pin mounted securely within the body casting prevents external leakage paths while providing sturdy support for the swinging disc assembly.

Quality Assurance & NDT Protocols

  • 1. 100% PMI Material Verification: Spectro XRF alloy verification on every CF8M pressure casting per ASTM E1476.
  • 2. Hydrostatic Shell & Seat Testing: 100% factory pressure tests verifying backflow sealing per API 598 / BS 1868 Low-Pressure Backflow Sealing Test.
  • 3. Full Compliance Documentation: Traceable MTRs supplied with every shipment.

Frequently Asked Technical Questions (ASCV-150-BC-CF8M-4-BW)

Q: How does the swing check mechanism ensure rapid backflow prevention in this NPS 4″ Class 150 valve?

A: The pin-hinged disc swings freely in the forward flow direction with minimal pressure drop, and instantly pivots shut against the Stellite hardfaced seat upon flow reversal, preventing water hammer and backflow.

Q: Can model ASCV-150-BC-CF8M-4-BW be installed in vertical upward or horizontal piping orientations?

A: In horizontal lines, it operates with maximum efficiency. For vertical upward flow applications, proper disk swing clearance is accounted for during manufacturing.

Need Technical Drawings or an RFQ Proposal?

Our valve engineering team provides certified dimensional general arrangement (GA) drawings, torque sizing calculations, and formal commercial quotations.

Proven in Severe Service: See how Gute's engineered flow equipment operates in major global applications in our Industrial Project References or explore technical selection criteria and material standards in our Technical Knowledge Base.

Additional information

Material

Pressure

Valve Size

Connection

Design Standard

API Standard
Size

NPS 4″
Pressure Class

Class 150
Body Material

CF8M
End Connection

BW
Operation

Automatic (Media Actuated)
Design Structure

Bolted Cover (BC)
Manufacturer

XIAMEN GUTE VALVE MANUFACTURING COMPANY
Trim / Internals

Trim 10, Trim 12, Trim 16

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