API 6A Manual Needle Throttle Valve
Nominal Sizes: 2-1/16″, 3-1/8″, 4-1/16″ (Max Orifice Sizes: 1″ to 3″)
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)
End Connections: API 6A Flanged, Clamp Hub, or Hammer Union
API 6A Manual Needle Throttle Valve
Product Definition & Safety Mission:
Serving as the primary pressure-control apparatus across surface Christmas trees and choke & kill manifolds, the JH Manual Needle Throttle Valve ensures fine-tuned flow regulation and pressure drawdown. Featuring a tapered needle stem coupled with a solid tungsten carbide seat and anti-blowout stem design, it provides linear throttling while protecting downstream equipment from severe pressure surges.
JH-Valve Needle Throttle Valve Technology Core:
- Tungsten Carbide Erosion Defense: Needle stem tip and seat constructed with solid tungsten carbide resist extreme cavitation and high-velocity slurry erosion.
- High-Precision Tapered Needle Trim: Precision-machined tapered stem paired with a clear scale indicator ensures accurate, linear flow and pressure control.
- PSL 3G & PR2 Certified Integrity: Manufactured to API 6A PSL 3/3G and PR2 validated, ensuring reliable zero-leakage operation up to 20,000 PSI.
- 100% NACE MR0175 Compliant: High-strength alloy construction guarantees
- Precision Choking
- Safety & Durability
- PSL 3G & PR2
Engineered for delicate pressure control across surface Christmas trees and choke manifolds, providing highly linear and precise flow regulation.
Core Features:
▌ Tapered Needle Stem Architecture → Precision-machined, progressive tapered stem tip | Enables linear flow coefficient adjustments to prevent pressure surges and control flow rates accurately
▌ Clear Visual Position Indicator → Corrosion-resistant calibrated scale indicator | Allows field operators to monitor orifice opening status effortlessly for exact choke positioning
▌ Tungsten Carbide Erosion Defense → Needle stem tip and choke orifice reinforced with solid Tungsten Carbide | Delivers outstanding resistance against high-velocity erosion and severe cavitation
Built with robust pressure-retaining structures and failure-preventative mechanisms for continuous operation under severe pressure differentials.
Core Features:
▌ Anti-Blowout Stem & Back-Seat → Integrated anti-blowout stem design with mechanical back-seating | Prevents stem ejection under high pressure and enables safe online packing adjustments
▌ Low Operational Torque Design → Precision stem threading matched with heavy-duty thrust bearings | Guarantees smooth handwheel rotation even under differential pressures up to 20,000 PSI
▌ Modular Seat Trim Replacement → Easily removable seat and stem trim components | Allows rapid inline inspection and replacement of wear components without removing the body from the manifold
Fully compliant with the most stringent global standards for high-pressure wellhead choke and pressure-control systems.
Core Features:
▌ PSL 3 / PSL 3G Manufacturing Standard → 100% volumetric NDE and high-pressure gas testing | Guarantees zero internal material flaws for high-consequence onshore and offshore applications
▌ PR2 Performance Verification → Validated under rigorous API 6A PR2 thermal and dynamic pressure cycling | Ensures zero-leakage operation from -46°C to +121°C under continuous high-pressure choking
▌ 100% NACE MR0175 Compliance → Forged construction across API Material Classes AA–HH | Delivers total resistance against Sulfide Stress Cracking (SSC) in high-pressure H2S/CO2 environments
Core Design & Advantages
- Tungsten Carbide Hard-Faced Trim → Tapered needle stem tip and choke seat orifice lined with solid Tungsten Carbide (Hardness ≥ 60 HRC) | Delivers exceptional resistance against severe cavitation and high-velocity erosion
- High-Precision Tapered Needle Choking → Precision-machined tapered stem paired with a clear target scale indicator | Ensures smooth, linear flow regulation and prevents sharp pressure spikes across wellhead manifolds
- Strict PSL 3G & PR2 Level Integrity → Built to rigorous API 6A PSL 3 / PSL 3G standards and PR2 performance specifications | Guarantees reliable operation and absolute seal integrity up to 20,000 PSI and -46°C to +121°C
- Anti-Blowout Stem with Back-Seat Sealing → Integrated anti-blowout stem mechanism paired with back-seating | Prevents stem ejection under high pressure while permitting safe online packing adjustments
- 100% Severe Sour Service Readiness → Fully compliant with NACE MR0175 / ISO 15156 standards (API Material Classes AA–HH) | Offers total protection against Sulfide Stress Cracking (SSC) in aggressive H2S/CO2 environments
- Low Operating Torque & Inline Maintenance → High-precision stem threads with heavy-duty thrust bearings; modular internal trim | Ensures effortless manual adjustment under extreme pressure and enables fast seat trim replacement without removing the valve body
FAQ-API 6A Manual Needle Throttle Valve
The JH Manual Needle Throttle Valve utilizes a precision-machined tapered needle stem tip paired with a solid tungsten carbide orifice seat. As the handwheel turns, the annular flow area changes linearly with stem displacement. Coupled with a high-visibility target scale indicator, field operators can easily monitor stem position and make micro-adjustments to achieve accurate pressure drawdown and smooth flow throttling under extreme differential pressures.
To combat severe cavitation, flashing, and abrasive particle erosion caused by high-velocity wellhead fluids, the needle stem tip and seat orifice are either constructed with solid, high-density Tungsten Carbide or hard-faced with advanced alloys. Additionally, the valve incorporates an anti-blowout stem mechanism and stem-backseat sealing to ensure supreme operator safety and operational durability during continuous manual throttling.
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 manual needle throttle valves and choke valves, feature a top-entry architecture. Field technicians can unbolt the top bonnet assembly and extract internal needle stems, tungsten carbide seats, or packing components for fast inspection and maintenance without disconnecting the valve body from the manifold line, minimizing field downtime.