8" 2500LB LTCS Open Die-Forged Swing Check Valve
8" 2500LB LTCS Open Die-Forged Swing Check Valve - Image 2
8" 2500LB LTCS Open Die-Forged Swing Check Valve - Image 3
8" 2500LB LTCS Open Die-Forged Swing Check Valve - Image 4

8″ 2500LB LTCS Open Die-Forged Swing Check Valve

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Description

Technical Data Sheet

Forged Swing Check Valve (Free Forging Process)

Model: FCV-SWING-2500 / API 602 / ASME B16.34 Compliant

1. Product Overview

This swing check valve is manufactured using the free forging process, which ensures a homogenous grain structure, superior mechanical strength, and complete traceability of materials. It is designed to prevent reverse flow in high-pressure piping systems. The valve features a bolted bonnet, renewable seat, and swing-type disc design. The body material is ASTM A350 LF2, specifically selected for low-temperature services and offshore applications requiring high impact toughness.

2. Design Standards & Specifications

Parameter Specification
Valve Type Swing Check Valve (Bolted Bonnet, Renewable Seat)
Forging Process Free Forging / Open Die Forging (Ensuring directional grain flow)
Design Standard API 602, ASME B16.34, BS 1868
Face-to-Face Dimension ASME B16.10
End Connections ASME B16.5 (RF / RTJ Flanges) or ASME B16.25 (Butt-Weld)
Pressure-Temperature Rating ASME B16.34
Test & Inspection API 598
NACE Compliance NACE MR0175 / ISO 15156 (For sour service environments)
Material Impact Test Charpy V-Notch impact test per ASTM A370 (Required for LF2 at -46°C)

3. General Specifications

Parameter Range / Description
Nominal Size 8 inch (DN200)
Pressure Rating ASME Class 2500
Bore Type Full Bore / Reduced Bore (As required)
Temperature Range -46°C to +345°C (LF2 material limits)
Operation Automatic (Flow dependent)
Connection Type Flanged (RF/RTJ) / Butt-Weld End (BW)
Installation Position Horizontal or Vertical (Flow direction upward)

4. Material Specifications (Free Forged Components)

Component Material Notes
Body ASTM A350 LF2 Class 1 Free forged; Impact tested at -46°C (Charpy ≥ 20J avg.)
Bonnet ASTM A350 LF2 Class 1 Free forged; Matched with body material
Disc (Hanger) ASTM A182 F316 / A350 LF2 + Stellite Stainless steel or LF2 with hardfacing
Seat Ring ASTM A182 F316 + Stellite Hardfacing Renewable type, threaded or press-fit
Hinge Pin ASTM A182 F304 / F316 Corrosion resistant
Body Bolting / Nuts ASTM A320 L7 / A194 Gr. 4 Low-temperature alloy steel bolting
Gasket Spiral Wound SS316/Flexible Graphite (with inner ring) For bonnet-body seal
Nameplate Stainless Steel Attached with corrosion-resistant rivets
Surface Coating Inorganic Zinc Primer / Epoxy Coating (Optional) For offshore/industrial environments

5. Free Forging Process Advantages

  • Grain Structure Refinement: The free forging process breaks up as-cast structures and refines the grain size of the LF2 material, resulting in superior mechanical properties and uniform directional strength .

  • Enhanced Impact Toughness: Forged LF2 exhibits excellent impact resistance at sub-zero temperatures, making it ideal for cryogenic and offshore applications.

  • Soundness & Traceability: Free forging eliminates internal voids and ensures 100% ultrasonic testability. Full material traceability from ingot to finished product.

  • Fiber Flow Lines: The forging process aligns the grain flow with the contour of the valve body, increasing resistance to high pressure and thermal stress.

6. Key Design Features

  • Swing-Type Disc: The disc swings on a hinge pin, offering minimal pressure drop and unobstructed flow path when fully open .

  • Renewable Seat Ring: The seat is a separate, replaceable component, hardfaced with Stellite for excellent wear and erosion resistance, extending valve service life without replacing the body.

  • Bolted Bonnet Construction: Designed for high-pressure classes (2500LB), the bolted bonnet provides secure sealing and allows easy access for inspection and maintenance .

  • Anti-Rotation Disc Design: The disc arm is designed to prevent rotation, ensuring consistent sealing alignment.

  • Low Pressure Drop: The full bore design (if specified) minimizes turbulence and pressure loss across the valve .

7. Performance Data (API 598)

Test Requirement
Shell Test (Hydrostatic) 1.5 x Rated Pressure (37500 psi / 258 bar g for Class 2500)
Seat Leakage Test (Hydrostatic) 1.1 x Rated Pressure (27500 psi / 190 bar g)
Backseat Test Optional for bolted bonnet designs
Leakage Rate (Seat) No visible leakage permitted per API 598 (Zero leakage)
Impact Testing (LF2) Charpy V-Notch at -46°C: Average ≥ 20 ft-lb (27J), single ≥ 15 ft-lb (20J)

8. Principal Dimensions (Reference – ASME B16.10 Class 2500)

Note: Final dimensions to be confirmed based on manufacturer’s detailed drawing and end connection type (Flanged vs. BW).

Dimension Item Value (mm/in)
Nominal Size 8 inch (DN200)
Face-to-Face Length (Flanged) Approx. 660 mm (26.00 in) per ASME B16.10
Outside Diameter of Body Forged profile, varies by manufacturer
Flange OD (ASME B16.5 Class 2500) Approx. 585 mm (23.03 in)
Flange Thickness (min) Approx. 92.1 mm (3.63 in)
Bolt Circle Diameter Approx. 495 mm (19.50 in)
Number of Bolt Holes 12
Bolt Hole Diameter Approx. 54 mm (2.13 in)
Approx. Weight 400 – 550 kg (Depending on bore and end type)

9. Applications

  • High-Pressure Pipelines: Crude oil, natural gas, and product transmission lines .

  • Offshore Platforms: High-pressure manifolds, injection systems, and production headers .

  • Refineries & Petrochemical Plants: Hydrocracking units, high-pressure hydrogen service, and catalytic reforming.

  • Power Generation: Supercritical steam and feedwater systems.

  • Low-Temperature Services: LPG, ethylene, and other cryogenic hydrocarbon handling (LF2 rated to -46°C).

10. Testing & Certification

Each valve shall be manufactured, tested, and certified in accordance with the following:

  1. Material Test Certificates (MTC): EN 10204 Type 3.1 or 3.2 certification for body, bonnet, and bolting materials, including chemical analysis and mechanical properties (Tensile, Yield, Elongation).

  2. Impact Test Certificate: Certified report of Charpy V-Notch impact tests at -46°C for LF2 materials.

  3. Hydrostatic Testing: Shell and seat test reports per API 598.

  4. NDE (Non-Destructive Examination):

    • Visual inspection (VT)

    • Magnetic Particle Inspection (MT) or Dye Penetrant Test (PT) on critical welds (if any) and surfaces.

    • Ultrasonic Examination (UT) on forged body (optional but recommended for Class 2500).

  5. NACE Compliance: Statement of compliance with NACE MR0175 for sour service (if specified).

  6. Forging Quality: Certification that parts are produced by free forging process with grain flow optimization.

11. Ordering Information

Please specify the following to ensure correct selection:

  1. Size & Pressure: 8″ – 2500LB

  2. Body Material: ASTM A350 LF2 (Free Forged)

  3. End Connections: Flanged (RF/RTJ) or Butt-Weld (BW)

  4. Bore: Full Bore or Reduced Bore

  5. Trim Material: (e.g., F316 + Stellite Seat)

  6. Service Conditions: Design pressure, temperature, and flow rate.

  7. Certifications: NACE MR0175, Impact Test Reports, PED, etc.

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