Description

Technical Data Sheet – API 6A FLS Slab Gate Valve

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1. Product Overview

• Product Name: API 6A FLS Slab Gate Valve

• Valve Type: Slab Gate Valve (Through-Conduit, Floating Gate Design)

• Design Standard: API Specification 6A (21st Edition)

• Size Range: 1-13/16″ to 11″ (46mm to 279mm)

• Pressure Ratings: 2,000 psi to 20,000 psi (13.8 MPa to 138 MPa)

• Body Material: Forged Alloy Steel (AISI 4130, 75 KSI Yield / 95 KSI Tensile)

• Operation: Manual (Non-Rising Stem) / Hydraulic Actuator

• Connection Type: Flanged End (API 6A Flange) / Clamp Hub / Threaded

• Application: Wellhead Christmas Trees, Choke & Kill Manifolds, Fracturing Service, Subsea Production Systems

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2. Applicable Standards & Specifications

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3. Technical Parameters

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4. Main Materials of Parts

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5. Design Features

5.1 Valve Design

• Slab Gate Construction: Parallel gate design with floating seats provides bi-directional sealing and allows thermal expansion .

• Through-Conduit Full Bore: Full bore design eliminates pressure drop and turbulence, allowing passage of pigs and tools .

• Forged Construction: All pressure-containing parts are forged for superior strength and reliability in high-pressure service .

5.2 Sealing System

• Metal-to-Metal Sealing: Gate-to-seat, seat-to-body, and body-to-bonnet seals are metal-to-metal, ensuring fire-safe performance .

• Dual Lip Seat Seals: Two spring-loaded, pressure-energized non-elastomeric lip seals between each seat:

  • Serve as barrier against contaminants

  • Maintain gate-to-seat contact, eliminating body cavity clearance

  • Enhance sealing at very low differential pressures

• Stem Backseat: Provides secondary stem seal and allows packing replacement under pressure when valve is fully open .

• Non-Elastomeric Stem Seal: Spring-loaded, pressure-energized design requires no longitudinal preload or precise spaceout .

5.3 Operational Features

• Bi-Directional Sealing: Seals pressure from either direction equally .

• Non-Rising Stem (NRS): Ideal for limited space installations; stem threads protected from environment .

• Low Operating Torque: Anti-friction bearings and optimized seat design reduce torque requirements .

• Bearing Lubrication: Grease fitting allows positive bearing lubrication .

• Optional Torque Multiplier: Available for high-pressure manual operation .

5.4 Additional Features

• Qualification Testing: Certified to API 6A Annex F (PR-2) and Annex I (Class II) for extreme service .

• CRA Inlay: Optional Alloy 625 inlay on ring grooves for corrosion resistance .

• Actuator Ready: Easily equipped with hydraulic actuators for manifold or subsea service .

• Sealant Injection: Optional emergency sealant injection fittings for seats and stem .

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6. Dimensional Data (Typical – Flanged End)

Note: Dimensions are for reference only. Final dimensions depend on pressure class, manufacturer, and specific configuration.

For complete dimensional data across all sizes and pressure classes, refer to manufacturer’s certified drawings.

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7. Available Configurations – Size vs. Pressure Matrix

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8. Material & Specification Options

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9. Inspection & Testing

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10. Applications

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Remarks:

• The FLS valve is suitable for extreme sour service (HH material class) with proper material selection .

• For subsea applications, additional features such as ROV interface and double block-and-bleed are available.

• Hydraulic actuators (fail-safe close/open) can be integrated for remote operation .

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This data sheet is for reference only. All specifications are subject to final confirmation by the manufacturer based on specific service conditions and applicable API 6A requirements.