API 6A Slab Gate Valve
Nominal Sizes: 1-13/16″ to 7-1/16″
Working Pressure Ratings: 2,000 PSI to 20,000 PSI (13.8 MPa to 138.0 MPa)
Product Specification Levels (PSL): PSL 1, PSL 2, PSL 3, PSL 3G
Performance Requirement Levels (PR): PR 1, PR 2
Material Classes: AA, BB, CC, DD, EE, FF, HH (Fully compliant with NACE MR0175 / ISO 15156)
Temperature Ratings: K, L, P, R, S, T, U, V (-46°C to +121°C)
Connexions finales : API 6A Flanged, Clamp Hub, or Threaded
API 6A Slab Gate Valve
Définition du produit et mission de sécurité :
As the primary critical control valve in API 6A wellhead and Christmas tree systems, the API 6A Slab Gate Valve (Flat Gate Valve / Through-Conduit Gate Valve) is engineered to execute precise fluid control and emergency high-pressure shut-off. Featuring a bi-directional sealing mechanism and full-bore through-conduit architecture, it creates a continuous, smooth waterway aligned with the pipe ID when fully open. This structure virtually eliminates fluid turbulence and erosion while enabling unhindered pigging operations.
JH-Valve Slab Gate Valve Technology Core:
- Full-Bore Through-Conduit Flow Path: Smooth internal channel matching pipe ID | Delivers minimal flow resistance, supports full pigging, and minimizes turbulence
- Metal-to-Metal Hard Seating: Precision-lapped gate and seats with hard-facing coating | Guarantees durable zero-leakage shut-off under severe sand erosion and high-pressure drops
- High PSL 3G & PR2 Level Integrity: Built to strict API 6A PSL 3 / PSL 3G specifications and PR2 performance levels | Maintains sealing reliability across extreme temperature ranges (-46°C to +121°C) and pressure cycling
- Severe Sour Service Metallurgy: API Material Classes AA–HH | 100% compliant with NACE MR0175 / ISO 15156 standards for superior H2S and CO2 stress cracking resistance
- Through-Conduit
- Erosion & Corrosion
- PSL 3G & PR2
Designed for high-pressure wellhead and Christmas tree main lines, the JH Slab Gate Valve utilizes a full-bore through-conduit design that creates a continuous, smooth waterway when fully opened.
Caractéristiques principales :
▌ Full-Bore Through-Conduit Design → Bore diameter fully matches the pipe ID | Minimizes pressure drop and flow turbulence, enabling unhindered line pigging
▌ Bi-Directional Metal-to-Metal Sealing → Precision-lapped gate and seat interfaces | Delivers absolute zero-leakage shut-off regardless of pressure direction
▌ Floating Seats & Self-Cleaning → Pressure-energized floating seat structure | Prevents debris and sand accumulation in the body cavity, extending sealing lifespan
Engineered for severe environments involving high sand concentration, fracturing slurries, and sour gas (H2S/CO2) service, utilizing advanced metallurgy and surface treatments.
Caractéristiques principales :
▌ HVOF Hard-Facing Coating → Tungsten Carbide coating on gate and seat sealing faces | Surface hardness ≥ 60 HRC, providing exceptional resistance to particle erosion and wear
▌ Anti-Blowout Stem Architecture → Integrated stem back-seat sealing mechanism | Allows safe replacement of stem packing while the valve remains under full working pressure
▌ 100% NACE MR0175 Compliance → Forged construction available across API Material Classes AA–HH | Completely prevents Sulfide Stress Cracking (SSC) in hostile sour environments
Complies with the highest international procurement standards for deep-water, high-pressure, and critical wellhead applications worldwide.
Caractéristiques principales :
▌ PSL 3 / PSL 3G Manufacturing Standard → 100% volumetric NDE and high-pressure gas testing | Ensures zero internal defects for critical offshore and onshore production
▌ PR2 Performance Verification → Fully validated through API 6A PR2 dynamic thermal and pressure cycling | Guarantees reliable seal integrity across -46°C to +121°C temperature ranges
▌ Grease Injection & Emergency Protection → Body and seat grease fittings with drain valves | Allows emergency sealant injection for backup sealing to protect wellhead integrity
Conception de base et avantages
- Full-Bore Through-Conduit Flow Path → Smooth internal channel matching the pipeline ID | Minimizes fluid turbulence and pressure drop while supporting unhindered pigging operations
- Bi-Directional Metal-to-Metal Hard Seating → Precision-lapped gate and floating seats coated with Tungsten Carbide (Hardness ≥ 60 HRC) | Ensures dependable zero-leakage shut-off under full differential pressure in either direction
- Strict PSL 3G & PR2 Level Integrity → Built to rigorous API 6A PSL 3 / PSL 3G standards and PR2 performance specifications | Guarantees sealing reliability under severe thermal (-46°C to +121°C) and pressure cycling conditions
- Anti-Blowout Stem with Back-Seat Sealing → Integrated mechanical back-seat stem structure | Enables safe online packing inspection and replacement while the valve remains energized under working pressure
- 100% Severe Sour Service Readiness → Fully compliant with NACE MR0175 / ISO 15156 standards (API Material Classes AA–HH) | Provides exceptional resistance to H2S and CO2 sulfide stress cracking
- Secondary Emergency Sealant Injection → Outfitted with dedicated body and seat grease fittings plus drain valves | Allows high-pressure sealant injection for instant secondary sealing during emergency scenarios
FAQ-API 6A Slab Gate Valve
The JH Slab Gate Valve features a solid, single-piece slab gate combined with floating metal-to-metal seat rings. Line pressure automatically forces the gate tightly against the downstream seat ring regardless of flow direction, achieving a continuous, bubble-tight seal. This simple yet robust design reduces wear, prevents sediment buildup in the body cavity, and guarantees dependable bi-directional shut-off up to 20,000 PSI.
The sealing faces of both the slab gate and floating seats are coated with Stellite or HVOF-sprayed Tungsten Carbide hard-facing (Hardness ≥ 60 HRC). Coupled with a stem featuring non-rising / rising anti-blowout engineering and stem-backseat sealing capability, the valve can be repacked under full working pressure, drastically minimizing maintenance hazards and extending operational life in harsh fracturing and production environments.
PSL 3G represents the highest quality control tier under API 6A for gas-tight wellhead equipment, mandating rigorous high-pressure gas (Nitrogen) shell and seat testing beyond standard hydrostatic tests. JH-Valve holds official API 6A authorization with PSL 3G capability explicitly scope-covered on our official API certificate. Every PSL 3G valve undergoes in-house gas testing to guarantee zero-leakage gas containment in severe high-pressure gas wells.
PR2 (Performance Requirement Level 2) validates that a valve maintains bubble-tight sealing and smooth operation through dynamic temperature cycles (-46°C to +121°C) under full working pressure (up to 20,000 PSI). JH-Valve’s API 6A qualification scope officially includes PR2 performance validation, backed by certified third-party dynamic cycling test reports to ensure uncompromising reliability under extreme field fluctuations.
Every JH-Valve specified for sour service uses forged body materials and internal trims compliant with NACE MR0175 material limits. We strictly control heat treatment processes (such as double tempering) to maintain material hardness below HRC 22, eliminating the risk of Sulfide Stress Cracking (SSC) and Hydrogen-Induced Cracking (HIC) in high H₂S/CO₂ sour oil and gas environments.
JH-Valve offers full pressure ratings ranging from 2,000 PSI to 20,000 PSI (13.8 MPa to 138.0 MPa) and sizes from 2-1/16″ to 7-1/16″. End connections can be customized to API 6A 6B/6BX flanged ends, API 6A studded connections, or high-pressure hammer union ends (e.g., Fig 1502/2202) according to project specifications.
Yes. JH-Valve wellhead valves, including our slab gate valves and choke valves, feature a top-entry architecture. Field technicians can unbolt the top bonnet and extract internal gates, stem assemblies, or floating seats for fast inspection and replacement without disconnecting the valve body from the manifold line, minimizing field downtime.