API 6A Flanged Wellhead Gate Valve 2-1/16 Inch 5000 PSI PSL3 EE-NL Dual Seal

Product Specification

API 6A Flanged Wellhead Gate Valve 2-1/16" 5000 PSI

Product Introduction

This API 6A flanged wellhead gate valve is purpose-built for upstream oil and gas surface applications including wellhead assemblies, Christmas trees, choke manifolds, and flowline isolation. Rated at 5000 PSI (34.5 MPa) working pressure with PSL3 quality requirements, the valve features an expanding dual seal gate design that provides positive mechanical sealing in both upstream and downstream directions. The 2-1/16 inch nominal bore with API 6BX flanged ends is fully compliant with API 6A 21st Edition specifications. EE-NL temperature class with EE material class ensures reliable performance in sour service (NACE MR0175) environments at temperatures from -46°C to 121°C.

Key Features & Characteristics

• Expanding Dual Seal Gate Design: Unlike conventional slab gate valves, the expanding gate mechanism uses a wedge-shaped split gate that mechanically expands against both seats when closed, creating a positive mechanical seal independent of line pressure. This design provides zero-leakage shutoff even at low differential pressures.
• Through Conduit Full Bore: The gate opening matches the full pipe bore when fully open, eliminating turbulence, minimizing pressure drop, and allowing pigging operations without restriction.
• PSL3 Quality Level: Comprehensive quality requirements including 100% volumetric NDE (UT/RT) of all pressure-containing parts, Charpy impact testing at minimum design temperature, and full traceability per API 6A requirements.
• Sour Service Compliant: EE material class with NACE MR0175/ISO 15156 compliance ensures resistance to sulfide stress cracking in H2S-containing well fluids.
• Grease Injection Fittings: Integral grease fittings on seat and stem allow in-service lubrication and emergency seat sealant injection without valve removal.
• API 6BX Studded Flanges: Ring type joint (RTJ) flanges with BX ring gaskets provide reliable high-pressure sealing with full metal-to-metal contact.

Why Choose Us

• API 6A Licensed Facility: Our manufacturing facility holds active API 6A and API Q1 monogram licenses, audited regularly by the American Petroleum Institute for compliance.
• Full PSL3 Documentation Package: Every valve ships with a complete manufacturing record book (MRB) including material test certificates, NDE reports, pressure test charts, and final dimensional inspection records.
• Gas Tested Per API 6A Appendix F: In addition to hydrostatic shell and seat tests, valves undergo low-pressure gas seat testing (5-15 PSI air or nitrogen) to verify bubble-tight shutoff.
• Global Field Service Support: Technical service engineers available for installation supervision, commissioning support, and field maintenance training at wellsite locations worldwide.
• Competitive Lead Times: 20-30 working days standard delivery from our API-licensed facility, significantly faster than many US and European manufacturers for comparable API 6A products.

Technical Parameter Table

FAQ

Q: What is the difference between PSL2 and PSL3 for API 6A valves?
A: PSL3 requires significantly more rigorous quality controls including 100% volumetric NDE (UT or RT) of all pressure-containing parts, Charpy V-notch impact testing at minimum design temperature, and stricter material chemistry controls with full traceability. PSL3 is typically specified for critical wellhead and Christmas tree applications where failure consequences are severe.

Q: Can these valves be used in H2S (sour) service?
A: Yes, EE material class with NACE MR0175/ISO 15156 compliance is standard for our API 6A gate valves. All pressure-containing and pressure-controlling parts undergo hardness testing (HRC 22 max) to ensure resistance to sulfide stress cracking.

Q: Do you provide third-party inspection services?
A: Yes, we coordinate with all major third-party inspection agencies including Bureau Veritas, SGS, TUV, and DNV for witness testing, material verification, and final inspection at our facility. The inspection agency can stamp and sign off on all test documentation.