API 6A Check Valve
Nominal Diameter: 2-1/16″ – 7-1/16″ (DN50 – DN180)
Working Pressure: 2,000 PSI – 15,000 PSI (13.8 MPa – 103.5 MPa)
Specification & Performance: PSL 1 – PSL 3G | PR1, PR2
Temperatura di esercizio: -29°C to 121°C (API Temp Rating K – U)
Material Class: AA, BB, CC, DD, EE, FF, HH (Per API 6A / NACE MR0175)
Design Standards: API 6A, API Spec 16C, ASME B16.34, ISO 10423
Connessione: API Flange (6B/6BX RTJ), Hammer Union, Threaded
Drive Mode: Automatic / Spring-Assisted
API 6A Check Valve
Definizione del prodotto e missione di sicurezza:
Engineered for high-pressure wellhead, Christmas tree, and fracturing manifold applications, the API 6A Check Valve is designed to prevent reverse flow and safeguard upstream pumps and production equipment. Featuring dynamic rapid-response closing mechanisms, it effectively eliminates water hammer and line vibration, delivering reliable sealing and zero-leakage protection under working pressures up to 15,000 PSI.
JH-Valve Check Valve Technology Core:
- Non-Slam Fast-Closing Mechanism: Spring-assisted / low-inertia disc design | Accelerates closure response, reducing pressure surge and system noise by ≥ 25 dB
- Ultra-Hard Anti-Erosion Sealing: Stellite / Tungsten Carbide overlay | Surface hardness ≥ 60 HRC (Resists severe sand slurry and high-pressure frac-fluid erosion)
- Severe Sour Service Metallurgy: API Material Classes AA–HH | 100% compliant with NACE MR0175/ISO 15156 H2S cracking resistance standards
- Certified Low Fugitive Emissions: Pressure-energized bonnet seals & API 6A RTJ metal gaskets | Fully meets API 6A and ISO 15848-1 strict leakage standards
- Rapid Non-Slam Closure
- Zero-Leakage & Metal-to-Metal Sealing
- NACE Sour Service & Fugitive Emission
Engineered to respond instantly to flow reversal, JH check valves incorporate high-response spring-assisted or low-inertia tilting discs to eliminate water hammer and safeguard upstream pumps and compressors.
Caratteristiche principali:
▌ Spring-Assisted / Low-Inertia Disc Mechanism → Accelerates valve closure prior to flow reversal | Reduces peak pressure surge and noise by ≥ 25 dB, protecting pipeline integrity
▌ Optimized Hydrodynamic Flow Path → CFD-modeled internal cavity | Minimizes flow turbulence and pressure drop across the valve seat
▌ Impact-Dampened Sealing Contact → Engineered dampening design | Prevents disc chatter and seat pounding during frequent pressure pulsations
Designed for extreme high-pressure, high-temperature, and severe slurry conditions, JH check valves utilize precision-lapped hardfacing technology to maintain long-term tight shut-off.
Caratteristiche principali:
▌ Hard-Faced Carbide Sealing → Stellite or Tungsten Carbide overlay with surface hardness ≥ 60 HRC | Resists severe sand erosion and high-velocity fluid wear
▌ Dual-Sealing Option (Soft + Metal) → Elastomer / PTFE primary seal with metal backup | Achieves zero bubble-tight leakage under both low and high pressure
▌ Self-Cleaning Seat Design → Dynamic fluid washing action | Prevents solid accumulation and scaling on sealing faces to ensure repeatable shut-off
Built for sour gas wellheads and environmentally sensitive installations, JH check valves fully meet international compliance and low-emission safety standards.
Caratteristiche principali:
▌ NACE MR0175 / ISO 15156 Compliance → Forged/Cast corrosion-resistant alloy construction | Eliminates sulfide stress cracking in severe H2S/CO2 environments
▌ Pressure-Energized Bonnet Gasket → API 6A metal ring joint (RTJ) or pressure seal bonnet | Maintains zero leakage under extreme pressure cycling up to 15,000 PSI
▌ Certified Low Emission Architecture → Sealed enclosure design compliant with ISO 15848-1 | Guarantees environmental protection and operator safety
Progettazione e vantaggi principali
- Non-Slam Hydraulic Performance → CFD-optimized flow geometry and high-response disc kinetics | Prevents destructive water hammer and pressure surges during rapid flow reversal
- Extended Service Lifespan → Heavy-duty hardfaced sealing surfaces (surface hardness ≥ 60 HRC) | Engineered for continuous wellhead service with a design lifespan of ≥ 10 years, drastically lowering total cost of ownership (TCO)
- Ultra-Low Leakage Performance → Precision-lapped metal-to-metal seating | Complies with API 598 zero-leakage standards (fugitive emissions ≤ 10⁻⁶ mg/s·m)
- High Differential Pressure Capability → Robust internal design | Built to withstand pressure differentials up to 15,000 PSI without structural deformation or disc binding
- Low Pressure Drop Efficiency → Streamlined fluid channaels maximize flow capacity (Cv) | Reduces operating energy losses by > 20% compared to conventional check valves
- Severe Environment Readiness → Fully compliant with NACE MR0175 for sour service | Suitable for abrasive fracturing fluids, crude oil, and H2S/CO2 sour gas applications
FAQ-API 6A Check Valve
JH-Valve offers both Lift-type (Piston) and Swing-type API 6A Check Valves specifically designed for wellhead Christmas trees and high-pressure choke & kill manifolds. Utilizing a spring-assisted guided poppet or a heavy-duty swing clapper, the valve closes instantly upon backflow detection, creating a positive metal-to-metal bubble-tight seal that prevents reverse flow surges and protects upstream mud pumps and stimulation units.
Our check valves feature a top-entry bonnet design. Field engineers can quickly unbolt the bonnet and replace internal components—such as the valve seat, disc, or return spring—without disconnecting the main valve body from the pipeline or manifold. This minimizes field operational downtime and significantly reduces long-term maintenance costs.
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 check valves and choke valves, feature a top-entry architecture. Field technicians can unbolt the top bonnet and extract internal trims, discs, or seats for fast inspection and maintenance without disconnecting the valve body from the manifold line, minimizing field downtime.