A182 F304 Forged Cryogenic Ball Valve
A182 F304 Forged Cryogenic Ball Valve - Image 2
A182 F304 Forged Cryogenic Ball Valve - Image 3
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A182 F304 Forged Cryogenic Ball Valve

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Description

1. Valve Identification

  • Type: Side-Entry (Two-Piece Split Body), Full Bore, Floating Ball Design

  • Body Construction: 2-Piece Bolted Body (Body Halves Joined by Bolts)

  • Material: ASTM A182 F304/F304L (Forged Austenitic Stainless Steel)

  • Operation: Gear Operated / Extended Stem with Actuator

  • Design Standard: BS 6364 / ISO 28921-1 / MSS SP-134

  • End Connection: Flanged (RF, RTJ) ASME B16.5 / EN 1092-1 PN16-PN40

  • Face-to-Face: ISO 5752 Series 11 (Extended for Cryogenic) / BS 6364 Table 1

2. Design Parameters

Parameter Specification
Size Range DN 15 (½”) – DN 100 (4″)
Pressure Rating ASME 150 / 300 (PN16/PN40) (Floating ball limits high-pressure capability)
Temp. Range -196°C (LN<sub>2</sub>) to +80°C
Design Pressure Per ASME B16.34 at -196°C (Derated)
Service Media LNG, LN<sub>2</sub>, LAr, Ethylene

3. Materials of Construction

Component Material (ASTM) Notes
Body Halves A182 F304/F304L (Forged) Cryogenic Stabilization Treated
Ball A182 F304/F304L (Forged) Ra ≤ 0.4 µm, Free-Floating Design
Stem A182 F304 (Forged) Blowout-Proof, Anti-Static Design
Downstream Seat RPTFE (Glass-Filled) Spring-Assisted for Low-Temp Seal
Upstream Seat RPTFE (Optional Bidirectional) (Standard: Uni-directional seal)
Stem Seals Graphite Foil + RPTFE Live-Loaded Packing at Ambient Zone

4. Key Design Features

  • Side-Entry (Split Body) Construction:

    • Body halves bolted together (ASTM A193 B8M bolts).

    • Disassembly requires removal from pipeline.

  • Floating Ball Mechanism:

    • Ball moves axially under pressure to seal against downstream seat.

    • Limited to ASME 300 class max (due to stem thrust load).

  • Extended Bonnet:

    • Long neck design per BS 6364 Table 1 (e.g., 250mm for DN50).

    • Keeps stem packing at ambient temperature.

  • Cryogenic Treatment:

    • All forged components thermally stabilized at -196°C per BS 6364.

    • Impact tested at -196°C (min. 41J per ASTM A370).

5. Sealing & Performance

Test Standard Requirement
Seat Leakage ISO 5208 Class VI ≤ 0.1 Nm³/hr (He) at -196°C
Shell Test API 598 1.5x PN at ambient
Cryogenic Seat Test BS 6364 Annex A Submerged in LN<sub>2</sub> at 1.1x PN
Stem Leakage ISO 15848-1 Class B ≤10<sup>-5</sup> mbar·L/s (He)
Fire Safe API 607/6FA Not Standard (Requires redesign)

6. Operation & Limitations

  • Operating Torque:

    • Higher at high ΔP (ball thrust load on stem).

    • Example: ≤150 Nm at -196°C (DN50 PN40, ΔP=40 bar).

  • Pressure Limitations:

    • Max ASME 300 class (PN50) due to floating ball design.

  • Bidirectional Sealing:

    • Standard: Uni-directional (seals downstream only).

    • Optional bidirectional seats (contact for feasibility).

7. Certifications & Testing

  • Material Certs: EN 10204 3.1 for all forged parts.

  • Cryogenic Testing:

    • Liquid Nitrogen immersion test at -196°C + thermal cycling.

  • Compliance:

    • PED 2014/68/EU Category III (PN40).

8. Advantages & Trade-offs

Advantages Trade-offs
Lower cost vs. trunnion design Limited to ASME 300 class
Simple sealing mechanism Higher torque at high ΔP
Compact forged construction Not inherently fire-safe
Bubble-tight seal at low-moderate ΔP Maintenance requires pipe removal

9. Optional Features

  • Bidirectional Seats: For upstream/downstream sealing.

  • Anti-Blowout Stem: Enhanced safety (standard).

  • Oxygen Service Cleaning: Per CGA G-4.1.

  • Vent/Drain Ports: For cavity pressure relief.

10. Manufacturer & QA

  • Quality System: ISO 9001:2015.

  • Traceability: Full PMI (Positive Material Identification).

  • Marking: Laser-etched per ASME B16.34.

Critical Notes:

  1. Maintenance Limitation: Valve must be removed from pipeline to access internals.

  2. Pressure Capability: Do not exceed ASME 300 class (consult for high ΔP applications).

  3. Fire Safety: Floating ball + RPTFE seats are not API 607 compliant by default.

  4. Material: Forged F304L recommended for welding/corrosion-sensitive services.

Let me know if you need torque curves, cryogenic test certificates, or actuation sizing guidance!

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