DN25-PN16 2-Piece Cryogenic Ball Valve
Description
TECHNICAL DATA SHEET
Product: 2-Piece Cryogenic Ball Valve
Size: DN25 (1 inch)
Pressure Rating: PN16 (Class 150)
Body Material: F304 Stainless Steel (ASTM A182 F304)
Body Construction: 2-Piece, Floating Ball
Seat Type: Soft Seated (PCTFE / PEEK)
1. Basic Specifications
| Parameter | Value |
|---|---|
| Nominal Size | DN25 (1″) |
| Pressure Rating | PN16 (Class 150) |
| Valve Type | 2-Piece Floating Ball Valve |
| Body Construction | 2-Piece (Body + End Cap) |
| End Connections | Flanged (EN 1092‑1 PN16) / Threaded (ISO 7‑1 / NPT) / Socket Weld |
| Temperature Range | –196°C ~ +80°C (for cryogenic service) |
| Suitable Media | LNG (Liquefied Natural Gas), LPG, liquid nitrogen, liquid oxygen, liquid argon, ethylene, and other cryogenic fluids |
| Fire Safe Design | API 607 / ISO 10497 (optional) |
2. Main Features
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Cryogenic Service Design: Extended bonnet (stem extension) isolates the stem packing from the cryogenic fluid, preventing ice formation and ensuring proper packing function at low temperatures.
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2-Piece Body Construction: Compact design with bolted body joint for easy maintenance. The end cap can be removed to access internal components.
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Floating Ball Design: Under pressure, the ball shifts against the downstream seat, providing reliable shut-off.
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F304 Stainless Steel: Offers good corrosion resistance and low-temperature toughness, suitable for a wide range of cryogenic media.
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PCTFE / PEEK Seats: Provides excellent low-temperature sealing performance with enhanced wear resistance and dimensional stability at cryogenic temperatures.
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Anti-Static Device: Ensures electrical continuity between ball, stem, and body to prevent static charge buildup.
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Blowout-Proof Stem: Stem is designed to prevent ejection under pressure.
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Purge Port (Optional): Provisions for back-venting or purge connections available for safety in oxygen or hazardous services.
3. Material List (Recommended Cryogenic Configuration)
| Item | Part | Standard Material |
|---|---|---|
| 1 | Body | F304 (ASTM A182 F304) |
| 2 | End Cap | F304 |
| 3 | Ball | F304 + Chromium Plating / Chromium Carbide Coating (optional) |
| 4 | Seat Rings | PCTFE (Polychlorotrifluoroethylene) or PEEK(Polyetheretherketone) |
| 5 | Stem | F304 / 17-4PH |
| 6 | Stem Packing | PCTFE / PTFE (low‑temperature grade) or Flexible Graphite |
| 7 | Body Gasket | Spiral Wound, F304 + PCTFE / PTFE / Graphite |
| 8 | Bolting | A193 B8 / A194 B8 (304 stainless steel) |
| 9 | Extended Bonnet | F304 (provides thermal isolation) |
| 10 | Handle / Operator | Stainless Steel or Carbon Steel with insulation (optional) |
*Note: PCTFE is preferred for cryogenic applications down to –196°C due to its excellent low-temperature sealing properties; PEEK is suitable for higher-pressure cryogenic applications with good wear resistance.*
4. Seat Material Comparison
| Seat Material | Temperature Range | Characteristics | Typical Application |
|---|---|---|---|
| PCTFE | –196°C ~ +80°C | Excellent low-temperature sealing, low permeability, good dimensional stability | LNG, liquid oxygen, liquid nitrogen |
| PEEK | –196°C ~ +250°C | Higher mechanical strength, wear resistance, suitable for higher pressures | High-pressure cryogenic, cycling service |
| PTFE (Not Recommended) | –196°C ~ +80°C | Prone to cold flow and deformation at cryogenic temperatures; not preferred for critical cryogenic service | General purpose only |
5. Dimensions & Structural Data
| Parameter | Value |
|---|---|
| Face‑to‑Face Length (L) | ~120 mm (flanged per EN 558) / ~80 mm (threaded) |
| Extended Bonnet Height | ~100 – 150 mm (to ensure proper thermal gradient) |
| End Connections | Flanged – EN 1092‑1 PN16 (RF / FF) / Threaded (ISO 7‑1 / NPT) |
| Flange Facing (if flanged) | Raised Face (RF) or Flat Face (FF) |
| Top Height (H) | ~160 – 200 mm (with handle) |
| Operating Torque | ~10 – 25 N·m (soft seated, floating ball) |
| Approx. Weight | ~3 – 5 kg (flanged version) / ~1.5 – 2.5 kg (threaded version) |
Note: Final dimensions to be confirmed by manufacturing drawings.
6. Design & Testing Standards
| Item | Standard |
|---|---|
| Design & Manufacture | ASME B16.34 / EN 12516 / API 608 |
| Flanged End Connections | EN 1092‑1 / ASME B16.5 |
| Threaded End Connections | ISO 7‑1 (BSP) / ASME B1.20.1 (NPT) |
| Pressure‑Temperature Rating | ASME B16.34 / EN 1092‑1 |
| Fire Safe Test | API 607 / ISO 10497 (optional) |
| Cryogenic Testing | BS 6364 (or customer specification) |
| Pressure Testing | API 598 or ISO 5208 |
| Low‑Pressure Air Test | 0.6 MPa (6 bar) – bubble‑tight (zero leakage) |
| High‑Pressure Hydrostatic Test | 1.5 × rated pressure (body), 1.1 × rated pressure (seat) |
7. Cryogenic Service Considerations
| Consideration | Requirement |
|---|---|
| Material Toughness | Materials must pass Charpy impact tests at service temperature (e.g., –196°C for F304) |
| Extended Bonnet | Minimum height ensures packing temperature remains above freezing point of moisture in the air |
| Seat Material | PCTFE or PEEK required for reliable low-temperature sealing; PTFE is not recommended due to cold flow |
| Leakage Rate | Cryogenic valves typically require bubble‑tight shut‑off (helium leak testing often specified) |
| Thermal Cycling | Valve design must accommodate thermal contraction and expansion without loss of sealing |
| Packing | Low‑temperature packing (e.g., PCTFE or PTFE) must be used to maintain seal flexibility |
| Anti-Static | Essential to prevent static discharge in flammable cryogenic services |
8. Operating Guidelines
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Orientation: Typically installed with stem vertical; extended bonnet ensures packing remains at safe temperature.
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Thermal Conditioning: Before introducing cryogenic fluid, the valve should be slowly conditioned to avoid thermal shock.
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Operation: Handwheel operation may become stiff at cryogenic temperatures due to ice formation on the extended bonnet; this is normal and does not indicate packing failure.
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Maintenance: Extended bonnet valves allow packing replacement without removing the valve from the line, as the packing is located above the thermal isolation zone.
9. Typical Applications
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LNG Infrastructure: Liquefied natural gas receiving terminals, loading arms, vaporizers, and storage tanks.
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Air Separation Units (ASU): Liquid oxygen, liquid nitrogen, and liquid argon handling.
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Petrochemical: Ethylene and propylene plants with cryogenic processes.
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Cold Boxes: Cryogenic process modules in gas processing facilities.
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Food & Beverage: Liquid CO₂ and nitrogen freezing systems.
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Medical: Liquid oxygen and nitrogen storage and distribution.
10. Ordering Information
When ordering, please specify:
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Size: DN25
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Pressure Rating: PN16
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Body Material: F304
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End Connections: Flanged / Threaded / Socket Weld
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Seat Type: PCTFE (standard for –196°C) or PEEK (for higher pressure or cycling service)
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Optional Features: Fire‑safe design (API 607), anti‑static device, purge port, cryogenic test certification, insulated handle
This data sheet reflects the DN25 – PN16 2-Piece Cryogenic Ball Valve with F304 material and PCTFE / PEEK seats. For specific dimensions, torque curves, or actuator sizing support, please contact us with your detailed requirements.
