3-Piece Open Die Forged Cryogenic Ball Valve c/w SA Pneumatic Actuated
Sự miêu tả
TECHNICAL DATA SHEET
Cryogenic Floating Ball Valve (2-Piece, Flanged Ends, Stainless Steel)
- General Information
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Item
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Đặc điểm kỹ thuật
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Loại van
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Floating Ball Valve, 2-Piece Split Body, Side-Entry, Anti-Static, Anti-Blowout Stem
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Size Range
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DN15 – DN300 (½” to 12″)
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Xếp hạng áp suất
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Class 150 / 300 / 600 (PN16 – PN100)
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End Connection
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Flanged Ends (Raised Face / RTJ) per ASME B16.5
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Design Standard
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BS 6364 / ISO 28921-1 / MSS SP-134 / ASME B16.34 / API 6D
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Face to Face Standard
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ASME B16.10 / ISO 5752 / BS 6364 Table 1
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Test Standard
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API 598 / API 6D / BS 6364
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Service
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LNG, LO2, LN2, LAr, Ethylene, Methane, Cryogenic Industrial Gases
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Phạm vi nhiệt độ
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-196°C to +80°C (-320°F to +176°F)
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Loại lỗ khoan
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Full Bore / Reduced Bore (Specify)
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- Bill of Materials (Materials of Construction)
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Part Name
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Qty.
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Vật liệu
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Material Specification / Notes
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Body Halves
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2
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Stainless Steel
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ASTM A182 F304/F304L (Forged) or ASTM A351 CF8/CF3 (Cast)
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Quả bóng
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1
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Stainless Steel
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ASTM A182 F304/F316 (Forged), Chrome Plated / Surface Ra ≤ 0.4µm
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Thân cây
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1
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Stainless Steel
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ASTM A182 F304/F316, Anti-Blowout Design
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Seat (Downstream)
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1
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PCTFE / RPTFE
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Spring-Energized PCTFE (Preferred for -196℃) or Glass-Filled RPTFE
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Seat (Upstream)
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1
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PCTFE / RPTFE
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Optional Bidirectional Design
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Stem Seals / Packing
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Set
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PTFE + Graphite
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Live-Loaded Packing (Belleville Springs) at Ambient Zone
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Body Gasket
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2
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PTFE / Spiral Wound
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PTFE or SS+Graphite Spiral Wound
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Body Bolts & Nuts
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Set
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Stainless Steel
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ASTM A193 B8M (Bolts) / ASTM A194 8M (Nuts)
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Thrust Washer / Bearing
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1
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PTFE / Reinforced PTFE
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Reduces operating torque
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Thiết bị chống tĩnh điện
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1
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Stainless Steel
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Ball-to-Stem / Stem-to-Body
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Stop / Locking Device
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1
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Stainless Steel
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Optional for safety
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Name Plate
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1
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Stainless Steel
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MSS SP-25 marking
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- Material Specifications & Rationale
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Thành phần
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Vật liệu
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Rationale
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Body & Bonnet
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A182 F304/F316 / A351 CF8/CF8M
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Austenitic stainless steel retains ductility and impact toughness at -196°C. F304L/CF3 grades offer enhanced resistance to intergranular corrosion after welding. All components undergo cryogenic stabilization treatment per BS 6364 .
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Quả bóng
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A182 F304/F316
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Hard chrome plating or electroless nickel coating improves surface hardness (Ra ≤ 0.4µm) and ensures low friction against PCTFE seat .
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Ghế
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PCTFE (Spring-Energized)
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PCTFE (Poly-chloro-tri-fluoro-ethylene) maintains dimensional stability and resilience at -196°C. Spring-energized design ensures bubble-tight shut-off even at low differential pressures .
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Stem Seals
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PTFE + Graphite
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Extended bonnet positions packing away from cold zone; live-loading compensates for thermal cycles and prevents fugitive emissions .
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- Cryogenic Design Features
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Feature
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Sự miêu tả
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Benefit
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Extended Bonnet
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Length per BS 6364 (e.g., 250mm for DN50) keeps stem packing at ambient temperature .
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Prevents ice formation on packing; ensures reliable stem sealing and operation.
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Pressure Relief Hole
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Upstream-side hole in ball prevents cavity pressure buildup during warm-up .
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Eliminates risk of cavity over-pressurization and seat damage.
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Thiết bị chống tĩnh điện
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Springs/plungers ensure electrical continuity between ball, stem, and body .
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Prevents static charge accumulation in flammable cryogenic services.
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Blowout-Proof Stem
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Stem retained internally by shoulder or retaining ring .
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Safety critical: prevents stem ejection under pressure.
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Cryogenic Treatment
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All pressure-containing parts thermally cycled to -196°C .
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Stabilizes microstructure; ensures dimensional stability in service.
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- Dimensional Data (Reference – Flanged Type)
*Note: Dimensions vary by manufacturer, pressure class, and extension length. Below are typical values based on ASME B16.10 / BS 6364 .*
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Kích cỡ
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Face-to-Face (L)
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Extension Length (E)
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Height Open (H)
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Handwheel Dia. (D)
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Bolt Circle Dia.
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No. of Holes
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DN15 (½”)
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108 mm
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180 mm
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210 mm
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100 mm
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60.5 mm (2.38″)
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4
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DN25 (1″)
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127 mm
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200 mm
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240 mm
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125 mm
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79.4 mm (3.12″)
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4
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DN50 (2″)
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178 mm
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250 mm
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310 mm
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200 mm
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120.7 mm (4.75″)
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4
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DN80 (3″)
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203 mm
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280 mm
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370 mm
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250 mm
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152.4 mm (6.00″)
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4
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DN100 (4″)
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229 mm
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320 mm
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440 mm
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315 mm
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190.5 mm (7.50″)
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8
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DN150 (6″)
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394 mm
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400 mm
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570 mm
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400 mm
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241.3 mm (9.50″)
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8
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DN200 (8″)
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457 mm
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450 mm
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680 mm
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500 mm
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298.5 mm (11.75″)
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8
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Flange Details: Raised Face (RF) per ASME B16.5. For RTJ (Ring Type Joint) or BW (Butt Weld) ends, specify separately .
- Performance & Testing (Per API 598 / BS 6364)
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Test
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Medium
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Pressure / Condition
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Acceptance Criteria
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Shell (Body) Test
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Water / Nitrogen
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1.5 x Rated Pressure @ Ambient
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No visible leakage
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Seat (Seal) Test
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Air / Nitrogen
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1.1 x Rated Pressure @ Ambient
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ISO 5208 Class VI (Bubble-tight)
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Cryogenic Seat Test
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Liquid Nitrogen
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@ -196°C, 1.1 x Rated Pressure
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≤ 0.1 Nm³/hr (He) per BS 6364 Annex A
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Low Pressure Seat Test
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Air
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0.6 MPa (87 psi)
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Bubble-tight
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Stem Leakage Test
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Helium
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@ Ambient
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ISO 15848-1 Class B (≤10⁻⁵ mbar·L/s)
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Cavity Relief Test
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–
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Verify ball hole functions
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Pressure relief to upstream side
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Typical Test Pressures (Class 300 Example):
- Shell Test: 7.7 MPa (1,117 psi)
- Seat Test: 5.6 MPa (812 psi)
- Operating Torque & Actuation
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Kích cỡ
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Torque @ Ambient (Nm)
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Torque @ -196°C (Nm)
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Recommended Operator
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DN15 (½”)
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8
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12
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Đòn bẩy
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DN25 (1″)
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15
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22
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Đòn bẩy
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DN50 (2″)
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45
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68
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Lever / Gear
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DN80 (3″)
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90
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135
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Gear
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DN100 (4″)
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160
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240
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Gear
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DN150 (6″)
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350
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525
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Gear / Actuator
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DN200 (8″)
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600
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900
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Gear / Actuator
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Note: Torque values increase at cryogenic temperatures due to material contraction and seal compression . For actuated valves, specify pneumatic/electric/hydraulic actuator separately .
- Flow Characteristics (Full Bore)
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Kích cỡ
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Flow Coefficient Cv (US gal/min)
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Kv (m³/h)
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DN15 (½”)
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8 – 12
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7 – 10
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DN25 (1″)
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30 – 40
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26 – 35
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DN50 (2″)
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120 – 150
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104 – 130
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DN80 (3″)
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280 – 320
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242 – 277
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DN100 (4″)
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480 – 550
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415 – 476
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DN150 (6″)
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1,100 – 1,300
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952 – 1,125
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DN200 (8″)
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2,000 – 2,300
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1,730 – 1,990
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*Note: Reduced bore valves have lower Cv values (typically 60-80% of full bore).*
- Application Guidelines
- Suitable Media:
- LNG (Liquefied Natural Gas), Methane, Ethane, Ethylene
- LO2 (Liquid Oxygen), LN2 (Liquid Nitrogen), LAr (Liquid Argon)
- Liquid Hydrogen (with special material considerations)
- Not Suitable For:
- Media containing solid particles (may damage PCTFE seat)
- High-temperature service >80°C (soft-seal degradation)
- Fire-safe applications without special design (not API 607 compliant by default)
- Installation Orientation: Any position (preferably stem vertical for extended bonnet applications)
- Hướng dòng chảy: Bidirectional (with appropriate seat design)
- Special Requirements for Cryogenic Service
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Requirement
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Đặc điểm kỹ thuật
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Oxygen Service Cleaning
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If service is LOX or oxygen-enriched, valve must be cleaned and packaged per CGA G-4.1 with special packaging to maintain cleanliness .
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Material Traceability
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Full traceability per EN 10204 Type 3.1 required for all pressure-containing parts .
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Impact Testing
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Charpy V-Notch impact tests at -196°C per ASTM A370 (minimum 41J average) .
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PMI Testing
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100% Positive Material Identification verification for all alloy components .
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Cryogenic Cycle Testing
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Optional: 200+ thermal cycles between ambient and -196°C to validate long-term performance.
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Vacuum Jacket Compatibility
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Extended bonnet length must match insulation thickness for cold box applications.
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- Marking & Documentation
- Marking: Per MSS SP-25 (Size, Pressure Class, Material, Manufacturer’s Logo, Heat No., Cryogenic Rating, CE/PED if applicable)
- Documents:
- Material Test Certificates (EN 10204 3.1)
- Pressure Test Report (Ambient + Cryogenic)
- Certified Dimensional Drawing
- Cleaning & Degreasing Certificate (if oxygen service)
- NDE Reports (RT/PT/MT as required)
Procurement Notes
- Cấp áp suất: Confirm required class (150LB / 300LB / 600LB) based on design pressure and temperature derating per ASME B16.34 .
- Bore Type: Specify Full Bore (for minimum pressure drop) or Reduced Bore (for cost/weight savings) .
- Seat Material: Confirm preference:
- PCTFE: Better dimensional stability, preferred for cycling service at -196°C
- RPTFE/PTFE: Lower cost, suitable for less demanding applications
- Extension Length: Specify if valve will be installed in vacuum-jacketed or cold box applications (custom extension length may be required).
- Sự truyền động: If actuated (pneumatic/electric), provide torque requirements and control signal specifications .
- Special Cleaning: Specify if oxygen service cleaning is required (CGA G-4.1) .
- Fire-Safe Design: If fire-safe certification (API 607) is required, confirm with manufacturer as standard soft-seat designs are not fire-safe .
This technical data sheet complies with BS 6364, ASME B16.34, and API 6D requirements for cryogenic floating ball valves
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