API 6A Single-Flow Valve
Nominal Sizes: 2-1/16″, 2-9/16″, 3-1/8″, 4-1/16″, 5-1/8″ (DN50 to DN125)
Working Pressure Ratings: 2,000 PSI to 15,000 PSI (13.8 MPa to 103.5 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)
Bağlantı Sonlandırma: API 6A Flanged, API 6A Studded, Hammer Union End
API 6A Single-Flow Valve
Ürün Tanımı ve Güvenlik Misyonu:
Serving as the primary backflow defense across Christmas trees, fracturing, and water injection manifolds, the JH Single-Flow Valve protects upstream pumps from fluid hammer. Designed for high-pressure, abrasive applications, its top-entry body and precision-guided lift poppet deliver instant response and bubble-tight isolation up to 15,000 PSI.
JH-Valve Single-Flow Valve Technology Core:
- Anti-Chatter Guided Poppet: Guided stem and alloy spring eliminate oscillation, ensuring stable shutoff.
- Hardfaced Erosion Seating: Stellite/Tungsten Carbide facing resists sand erosion and proppant wear.
- Top-Entry Fast Maintenance: Allows full inline servicing in minutes without removing the body.
- 100% NACE MR0175 Compliant: Forged alloy steel fully resists Sulfide Stress Cracking (SSC) in sour environments.
- Instant Non-Return Sealing
- Top-Entry Maintenance
- API 6A & NACE Standards
Engineered for Christmas trees, high-pressure water injection, and fracturing lines, delivering millisecond-level response and bubble-tight backflow isolation.
Temel Özellikler:
▌ Precision-Guided Poppet Assembly → Features vertical top-and-bottom guidance with a heavy-duty fatigue-resistant spring | Eliminates poppet oscillation and eccentric wear under high velocity to ensure exact seating alignment
▌ Stellite Hardfaced Seating Surface → Sealing faces of poppet and seat layered with Stellite or HVOF Tungsten Carbide | Superior resistance against severe erosion from proppants, sand-laden fluids, and cement slurries
▌ Bubble-Tight Backpressure Shutoff → Precision-ground metal-to-metal conical seating backed by spring preload | Instantly creates a bubble-tight seal under both minimal differential pressure and severe 15,000 PSI backpressure
Provides a top-entry angle-body architecture and fast field replacement solutions for high-pressure oilfield manifolds.
Temel Özellikler:
▌ Top-Entry Rapid Inline Servicing → Designed with an angle body and accessible bonnet bolting | Enables field technicians to inspect or replace internal springs and poppets within minutes without removing the valve body from the line
▌ Optimized Low Pressure-Drop Flow Path → Internal cavity engineered via Computational Fluid Dynamics (CFD) | Minimizes fluid turbulence and flow restriction, maximizing efficiency in water injection and fluid transfer
▌ Flexible End Connections → Available with API 6A Flanged, Studded, and Hammer Union end configurations | Fully compatible with standard Christmas trees, water injection stations, and high-pressure flowlines
Complies with strict quality control, dynamic pressure verification, and hostile sour service requirements.
Temel Özellikler:
▌ Integral Forged Body with PSL 3G Quality → Forged from high-strength low-alloy steel with 100% volumetric NDE examination | Fully compliant with PSL 3G hydro and high-pressure gas testing to ensure zero structural defects
▌ PR2 Dynamic Thermal Validation → Validated under API 6A PR2 dynamic pressure cycling and thermal endurance tests | Guarantees reliable seal integrity and swift poppet response from -46°C to +121°C up to 15,000 PSI
▌ 100% NACE MR0175 Sour Service Readiness → Fully compliant with API Material Classes AA–HH and NACE MR0175 / ISO 15156 | Provides complete immunity to Sulfide Stress Cracking (SSC) in aggressive H2S/CO2 sour environments
Temel Tasarım ve Avantajlar
- Precision-Guided Anti-Chatter Poppet → Engineered with a precision vertical guide stem and heavy-duty spring | Completely eliminates poppet chatter under high flow rates, ensuring millisecond-level backflow response and bubble-tight zero-leakage sealing
- Stellite / Tungsten Carbide Hardfaced Seating → Sealing surfaces layered with high-hardness Stellite or HVOF Tungsten Carbide | Superior resistance against aggressive fluid erosion, sand abrasion, and proppant wear for extended service life
- Top-Entry Fast Inline Servicing → Angle-body top-entry structure with accessible bonnet bolting | Allows field technicians to perform full internal replacement of springs and poppets within minutes without disconnecting the valve body from the manifold
- CFD Streamlined Low Pressure-Drop Design → Internally contoured flow path optimized using Computational Fluid Dynamics | Significantly reduces flow turbulence and pressure loss, ensuring maximum operational efficiency
- Strict PSL 3G & PR2 Level Integrity → Integrally forged from high-strength low-alloy steel to API 6A PSL 1–3G standards and validated by PR2 dynamic cycling | Guarantees absolute structural soundness up to 15,000 PSI across -46°C to +121°C
- 100% Severe Sour Service Readiness → Fully compliant with API Material Classes AA–HH and NACE MR0175 / ISO 15156 standards | Delivers complete protection against Sulfide Stress Cracking (SSC) in aggressive H2S/CO2 sour oil and gas environments
FAQ-API 6A Single-Flow Valve
The JH Single-Flow Valve (Check Valve) utilizes a spring-loaded piston/poppet structure paired with a precision-machined metal-to-metal seating face. When forward pressure exceeds cracking threshold, the valve disc lifts smoothly to allow unrestricted full flow. The instant pressure drops or backflow occurs, the corrosion-resistant spring, combined with line backpressure, forces the disc instantly onto its metal seat ring, preventing fluid reversal and protecting upstream pumping equipment at pressures up to 20,000 PSI.
The sealing surfaces of both the valve poppet and seat are hard-faced with Stellite or HVOF-sprayed Tungsten Carbide (Hardness ≥ 60 HRC) to withstand severe fluid erosion, sand abrasion, and high-velocity turbulence. Featuring a top-entry forged body design and streamlined internal flow passage, turbulence is minimized, and internal poppet components can be replaced directly on-site without unbolting the body from the manifold line.
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 single-flow check valves and choke valves, feature a top-entry architecture. Field technicians can unbolt the top bonnet cover and extract internal poppets, springs, or seating assemblies for fast inspection and replacement without disconnecting the valve body from the manifold line, minimizing field downtime.