API 10000# Adjustable Angle Choke Valve
Description
Manual Angle Pattern Throttling Valve Technical Data Sheet (API 6A / RTJ Flanged)
1. Product Overview
Product Type: Angle Pattern Throttling Valve / Manual Choke Valve
Operation: Handwheel Operated / Manual
Connection Type: Flanged Ends, RTJ (Ring Type Joint)
Bonnet Type: Bolted Bonnet / Studded Connection
Design Standard: API 6A (Specification for Wellhead and Christmas Tree Equipment)
Nominal Size: 1 13/16″ ~ 4 1/16″ (46mm ~ 103mm) [Common API 6A sizes]
Pressure Rating: API 2000 psi ~ API 15000 psi (13.8 MPa ~ 103.5 MPa)
Material Class: AA ~ FF (per NACE MR0175 / ISO 15156)
Temperature Class: K, L, P, R, S, T, U, V (per API 6A)
Product Specification Level (PSL): PSL 1 ~ PSL 4 (as required)
Performance Requirement: PR1 ~ PR2
2. Applicable Standards & Specifications
| Item | Standard |
|---|---|
| Design & Manufacturing | API 6A (20th Edition or Latest) |
| Flange End Dimensions | API 6A (6B / 6BX Flanges) |
| Pressure-Temperature Rating | API 6A Annex F |
| Material Requirements | NACE MR0175 / ISO 15156 (for sour service) |
| Testing & Inspection | API 6A Annex F / API 6A Clause 10 |
| RTJ Gaskets | API 6A / ASME B16.20 |
| Quality Management | API Q1 / ISO 9001 |
3. Main Technical Parameters
| Item | Parameter Range / Description | |||||
|---|---|---|---|---|---|---|
| Pressure Rating (API) | 2000 psi | 3000 psi | 5000 psi | 10000 psi | 15000 psi | 20000 psi* |
| Nominal Sizes (in/mm) | 1 13/16″ (46) – 4 1/16″ (103); Larger sizes available upon request | |||||
| Shell Test Pressure | 1.5 x Rated Working Pressure (per API 6A) | |||||
| Seat Test Pressure | 1.1 x Rated Working Pressure (per API 6A) | |||||
| Applicable Media | Crude Oil, Natural Gas, Drilling Mud, Fracturing Fluids, Water Injection, CO2, H2S, etc. | |||||
| Working Temperature | Per API 6A Temperature Classes: -60°C ~ 180°C+ (depending on class) | |||||
| Material Class (NACE) | AA (General), BB (General), CC (Sour), DD (Sour), EE (Sour), FF (Sour) | |||||
| Flow Direction | Flow tends to close (Flow under seat – recommended for throttling) | |||||
| Leakage Rate | API 6A PR2 (Zero detectable leakage) | |||||
| Trim Type | Needle & Seat / Plug & Seat (Hardfaced with Stellite or Tungsten Carbide) |
Note: 20000 psi and higher available as special order.
4. Material of Construction (API 6A Material Classes)
Materials selected per API 6A based on service conditions (H2S, CO2, Temperature).
| Part Name | Material Class AA/BB (General Service) | Material Class DD/EE/FF (Sour Service) |
|---|---|---|
| Body | 4130 / AISI 4140 (Low Alloy Steel) | 316 Stainless Steel / F51 Duplex / Inconel 718 |
| Bonnet | 4130 / AISI 4140 (Low Alloy Steel) | 316 Stainless Steel / F51 Duplex / Inconel 718 |
| Stem / Needle | 17-4 PH / Inconel 718 + Hardfacing | Inconel 625 / 718 + Hardfacing |
| Seat | Integral / Inconel Clad + Stellite | Inconel Clad + Stellite / Tungsten Carbide |
| Disc / Plug Tip | Stellite 6 / 21 | Stellite 6 / 21 / Tungsten Carbide |
| Packing / Seals | PTFE / Graphite / Elastomers (Viton, HNBR) per temperature | |
| Body Gasket | API 6A Ring Gasket (R, RX, BX types) – Soft Iron / 316L / Inconel | |
| Bolting | A193 B7 / A194 2H | A193 B7M / A194 2HM / Inconel 718 |
5. Structural Features & Working Principle (API 6A)
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API 6A Compliant Design: Designed, manufactured, and tested in full compliance with API 6A specification, ensuring reliability in critical wellhead and flowline applications .
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Angle Pattern Configuration: The 90-degree angle body design minimizes fluid turbulence and erosion caused by high-velocity, solids-laden fluids common in oil and gas production .
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Precise Throttling / Choking Function: The valve uses a tapered needle or plug that moves linearly into a mating seat. By rotating the handwheel, the operator can precisely control the flow area, managing downstream pressure and flow rate .
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Severe Service Trim (Erosion Resistance) : Critical sealing and throttling surfaces are overlaid with Stellite or fitted with Tungsten Carbide inserts. These materials provide exceptional resistance to erosion from sand, proppant, and high-velocity flow .
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RTJ Flanged Connections: API 6A standard 6B or 6BX flanges with Ring-Type Joint grooves ensure a reliable metal-to-metal seal capable of containing extreme wellhead pressures .
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Manual Actuation with Position Indication: A heavy-duty handwheel and Acme threaded stem provide mechanical advantage for operation under high differential pressure. The rising stem offers clear visual indication of valve position .
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Backseat Capability: When fully open, the stem seals against a backseat in the bonnet, allowing packing replacement while the valve is under pressure .
6. Choke Trim Options (For Extreme Conditions)
| Trim Type | Application | Description |
|---|---|---|
| Stellite Overlay | General purpose throttling, moderate sand | Hard alloy overlay on 17-4PH or Inconel substrate |
| Tungsten Carbide (Solid) | Severe erosive service (high sand, fracturing) | Solid tungsten carbide seat and plug for maximum erosion resistance |
| Ceramic Trim | Extreme erosion / corrosion | High-purity ceramic components for longest service life in abrasive fluids |
7. Dimensional Data (Reference – API 6A 5000 psi / 10000 psi)
Note: Dimensions are for reference only. Final dimensions vary by manufacturer, PSL level, and specific pressure rating. Consult API 6A and manufacturer’s GA drawing.
| Nominal Size (in) | Pressure Rating (psi) | Flange Type | Flange OD (in/mm) | RTJ Groove | Length L (approx, in/mm) | Height (approx, in/mm) |
|---|---|---|---|---|---|---|
| 1 13/16″ | 5000 | 6B | 7.5″ (190) | R-30 | 10.5″ (267) | 8.5″ (216) |
| 1 13/16″ | 10000 | 6BX | 8.5″ (216) | BX-152 | 12.5″ (318) | 10.0″ (254) |
| 2 1/16″ | 5000 | 6B | 8.0″ (203) | R-31 | 12.0″ (305) | 9.5″ (241) |
| 2 1/16″ | 10000 | 6BX | 9.0″ (229) | BX-153 | 14.0″ (356) | 11.0″ (279) |
| 2 9/16″ | 5000 | 6B | 9.5″ (241) | R-37 | 14.0″ (356) | 11.0″ (279) |
| 2 9/16″ | 10000 | 6BX | 10.5″ (267) | BX-155 | 16.5″ (419) | 13.0″ (330) |
| 4 1/16″ | 5000 | 6B | 12.0″ (305) | R-41 | 18.0″ (457) | 16.0″ (406) |
8. Installation, Operation & Maintenance (IOM) Instructions
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Pre-Installation: Inspect RTJ grooves for damage. Ensure Ring Gasket material matches service (Soft Iron for general, 316L/Inconel for corrosive). Clean all surfaces .
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Installation: Install with flow arrow pointing downstream. For throttling applications, flow should tend to close the valve (flow under seat) for better control and stability. Support piping to avoid stress on valve flanges .
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RTJ Flange Make-up: Lubricate stud threads and ring gasket. Tighten nuts evenly in a crisscross pattern to the torque specified in API 6A or manufacturer’s recommendations .
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Operation: Rotate handwheel clockwise to close, counter-clockwise to open. Do not use excessive force or extensions to close against high differential pressure, as this may damage the seat .
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Packing Adjustment: If slight stem leakage occurs, packing can be adjusted by tightening the gland nuts evenly. For major repairs, the valve should be depressurized .
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Maintenance: API 6A valves are designed for long service life. Periodic inspection of trim for erosion is recommended in severe service. Replacement parts must be OEM-sourced to maintain API 6A compliance .
Note: This technical data sheet complies with API 6A specification for wellhead and tree equipment. For specific project requirements, including detailed material selection (Material Class), temperature classification, PSL level, and dimensions, please refer to the approved API 6A data sheet and purchase order.
