2″-900LB 2-Piece Cryogenic Floating Ball Valve
Description
TECHNICAL DATA SHEET
Product Name: 2-inch 900LB 2-Piece Cryogenic Floating Ball Valve
Model/Specification: 2″-900LB-CRYO-2PC-RTJ
Valve Type: 2-Piece Floating Ball Valve (Cryogenic Service)
Connection Type: RTJ Flanged (Ring Type Joint) – ASME B16.5
Body Material: Stainless Steel – ASTM A182 F316
1. Basic Design Parameters
| Parameter | Standard/Specification |
|---|---|
| Size | 2 inches (DN50) |
| Pressure Class | Class 900 LB (PN150 / 2250 PSI) |
| Body Material | Forged Stainless Steel – ASTM A182 F316 |
| Manufacturing Process | Forged Steel (Close Die Forged) |
| Design Standard | API 608 / API 6D / ASME B16.34 / BS 6364 (Cryogenic) |
| End Connection Standard | ASME B16.5 – RTJ Flanged (Ring Type Joint) |
| Face to Face Standard | ASME B16.10 / API 6D |
| Test & Inspection Std. | API 598 / BS 6364 (Cryogenic Test) |
| Fire-Safe Design | API 607 / API 6FA (Optional) |
| Fugitive Emission | ISO 15848-1 (Optional) |
2. Technical Specifications
| Parameter | Details |
|---|---|
| Valve Type | 2-Piece Floating Ball Valve, Bolted Body Construction |
| Body Type | Two-Piece Bolted Body with Side Entry |
| Bonnet Type | Extended Bonnet (for Cryogenic Service) |
| Service Temperature | -196°C to +120°C (with PCTFE seats) / Up to +200°C (with PEEK) |
| Applicable Media | LNG, LOX, LIN, LAr, Ethylene, LPG, and other cryogenic fluids |
| Bore Type | Full Bore (Standard) / Reduced Bore (Optional) |
| Ball Type | Floating Ball (pressure-assisted sealing) |
| Seat Type | PCTFE / PEEK (Cryogenic grade soft seats) |
| Sealing Principle | Upstream sealing – ball floats against downstream seat under pressure |
| Operation | Lever Handle / Gearbox / Pneumatic Actuator / Electric Actuator |
| Anti-Static Device | API 608 / API 6D Requirement (Standard) – Spring-loaded ball between ball and stem |
| Blow-Out Proof Stem | Standard |
| Cavity Pressure Relief | Self-relieving seat design / Relief hole in ball |
| Bonnet Installation | Integral extended bonnet with drip plate (ice prevention) |
| Locking Device | Available for safety lockout |
3. Material of Construction (F316 Stainless Steel)
| Part Name | Material | Standard/Grade |
|---|---|---|
| Body (2 pieces) | Forged Stainless Steel – F316 | ASTM A182 F316 |
| End Connector (RTJ) | Forged Stainless Steel – F316 | ASTM A182 F316 |
| Ball | Stainless Steel – F316 (Hardened, Chrome plated optional) | ASTM A182 F316 |
| Stem | Stainless Steel – F316 / 17-4PH | ASTM A182 F316 / 17-4PH |
| Seat Rings | PCTFE (KEL-F®) / PEEK | Cryogenic grade, self-relieving |
| Body Gasket | Spiral Wound | Stainless Steel + Graphite |
| Stem Seals / Packing | PCTFE / Flexible Graphite | Low temperature stable materials |
| Thrust Bearings | PTFE + Stainless Steel | Self-lubricating |
| Anti-Static Device | Stainless Steel Ball + Spring | 316 SS |
| Body Bolts/Nuts | Stainless Steel – B8 / 8 | ASTM A193 B8 / A194 8 |
| Drip Plate | Stainless Steel – F316 | Welded to bonnet |
| Handle / Gear | Stainless Steel / Carbon Steel | With locking option |
4. Main Dimensions & Connection Details
Note: Dimensions for 2″ Class 900 RTJ Flanged Cryogenic Ball Valve. Based on ASME B16.10, API 6D, and industry standards for cryogenic extended bonnet.
4.1 End-to-End Dimensions (Face-to-Face – RTJ)
| Size | Pressure Class | L (RTJ) mm | L (RTJ) in | H (Open) mm | H (Open) in | W (Gear) mm | Weight (approx. kg) |
|---|---|---|---|---|---|---|---|
| 2″ | 900LB | 368 | 14.5 | ~450 | ~17.7 | ~350 | ~60-80 |
Note: Height (H) includes extended bonnet for cryogenic service. Weight depends on actuator/gearbox choice.
4.2 RTJ Flange Details (Per ASME B16.5 – Class 900)
| Parameter | 2″ RTJ Flange |
|---|---|
| Flange Diameter (OD) | 215 mm (8.5 in) |
| Bolt Circle Diameter (PCD) | 165.1 mm (6.5 in) |
| Number of Bolt Holes | 8 |
| Bolt Hole Diameter | 25.4 mm (1.0 in) |
| Bolt Thread Size | 7/8″ UNC |
| RTJ Groove Number | R-20 or RX-35 (per ASME B16.20) |
| Groove Depth | 8.5 mm (0.33 in) approx. |
| Hub Diameter | 127 mm (5.0 in) |
| Ring Gasket Material | Soft Iron / Stainless Steel (as per service) |
4.3 Extended Bonnet (Cryogenic Feature)
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Extension Length: Designed to keep stem packing above frost line (typically 200-300 mm for 2″ valve at -196°C).
-
Drip Plate: Included to prevent ice formation on body/bonnet joint.
-
Heat Transfer Design: Narrow clearance between stem and bonnet ID ensures packing near ambient temperature.
-
Material: F316 stainless steel (same as body).
5. Pressure-Temperature Rating (ASME B16.34 / Class 900)
*Material Group: Stainless Steel – ASTM A182 F316 with PCTFE/PEEK seats*
| Temperature (°C) | Working Pressure (bar) | Working Pressure (psi) | Notes |
|---|---|---|---|
| -196 to -46 | 150 | 2175 | Cryogenic Range (BS 6364 certified) |
| -29 to 38 | 150 | 2175 | Maximum Rating (Class 900) |
| 50 | 148 | 2145 | |
| 100 | 140 | 2030 | |
| 150 | 132 | 1915 | Max for PCTFE |
| 200 | 124 | 1800 | With PEEK seats |
*Note: For cryogenic service (below -46°C), valves are tested and certified per BS 6364 at -196°C.*
6. Test Pressure (API 598 / BS 6364)
| Test Type | Medium | Pressure (bar) | Pressure (psi) | Acceptance Criteria |
|---|---|---|---|---|
| Shell Test (Hydrostatic) | Water | 225 | 3260 | 1.5 x 38°C Rating (no visible leakage) |
| High-Pressure Seat Test | Water | 165 | 2390 | 1.1 x 38°C Rating (Zero leakage – soft seats) |
| Low-Pressure Seat Test | Air / N2 | 5.5 – 7.0 | 80 – 100 | Bubble-tight |
| Cryogenic Seat Test | Helium / N2 | @ Rated Pressure | @ Rated Pressure | Per BS 6364 at -196°C |
7. Flow Characteristics (2″ – Full Bore)
| Parameter | Value |
|---|---|
| Port Diameter (Full Bore) | ~51 mm (2.0 in) |
| Flow Coefficient Cv (approx) | ~150 – 200 (typical for 2″ full bore ball valve) |
| Flow Coefficient Kv (approx) | ~130 – 170 |
| Flow Characteristic | Quick Opening (On-Off) |
| Shut-off Class | API 598 / BS 6364 (Zero Leakage – Soft Seat) |
| Bore Type | Full Bore (minimal pressure drop) |
8. Features & Applications
-
Key Features:
-
2-Piece Forged Body: Allows in-line maintenance of trim while providing robust, leak-free construction.
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Cryogenic Service Capability: Designed for temperatures as low as -196°C (-320°F) , suitable for LNG, LOX, LIN, and other liquefied gases.
-
Extended Bonnet: Protects stem seals from extreme cold, ensuring operability and preventing ice formation.
-
Floating Ball Design: Ball floats against downstream seat, providing tight, bidirectional sealing.
-
RTJ Flanged Ends: Metal-to-metal ring joint seal for high-pressure and high-integrity applications.
-
No-Trap Cavity Design: Relief hole in ball or self-relieving seats prevents dangerous pressure buildup due to vaporization of trapped cryogenic liquid.
-
Anti-Static Device: Dissipates static charge, critical for flammable media like LNG.
-
Blow-out Proof Stem: Retained within body even if gland is removed.
-
Fire-Safe Design: Optional API 607 certification ensures sealing integrity in case of fire.
-
BS 6364 Certification: Designed and tested to international cryogenic valve standard.
-
NACE MR0175 Compliance: Optional for sour service (H₂S) environments.
-
Lockable Handle / Gear: Safety lockout capability for maintenance.
-
-
Main Applications:
-
LNG (Liquefied Natural Gas): Liquefaction, storage, transportation, and regasification plants.
-
Air Separation Units (ASU): Handling LOX, LIN, LAr.
-
Petrochemical: Ethylene, propylene, LPG, and other cryogenic hydrocarbons.
-
Industrial Gas: Cryogenic storage tanks and transfer lines.
-
Refrigeration Systems: Low-temperature industrial refrigeration.
-
High-Pressure Cryogenic Systems: Class 900 applications.
-
9. Comparison: 2-Piece vs. 3-Piece Design
| Feature | 2-Piece Construction | 3-Piece Construction |
|---|---|---|
| Body Joints | One bolted joint (body to end cap) | Two bolted joints (end caps to center body) |
| In-Line Maintenance | Limited – requires removal from line for full trim access | Easy – end caps can be removed without taking valve out of line |
| Weight | Lighter | Slightly heavier |
| Cost | Lower | Higher |
| Typical Use | General purpose, cost-sensitive | High-maintenance, frequent cleaning applications |
*For cryogenic service, 2-piece design offers reliable performance with fewer potential leak paths.*
10. Ordering Information
Please specify when ordering:
-
Valve size: 2″ (DN50)
-
Pressure class: 900LB
-
Body material: F316 (ASTM A182 F316)
-
End connections: RTJ Flanged (ASME B16.5)
-
Seat material: PCTFE / PEEK
-
Bore type: Full Bore (Standard)
-
Operation: Lever handle / Gearbox / Pneumatic actuator / Electric actuator
-
Special requirements: Fire-safe (API 607), NACE MR0175, oxygen cleaning, PMI testing
-
Certifications: Material Test Reports (EN 10204 3.1/3.2), BS 6364 cryogenic test certificate
*Disclaimer: The above data is prepared based on common industry standards (API 608, API 6D, ASME B16.34, BS 6364) for 2-piece cryogenic floating ball valves with RTJ ends . RTJ flanges provide reliable metal-to-metal sealing at high pressures and low temperatures. Specific dimensions may vary by manufacturer. The final technical agreement and certified drawings shall prevail.*
