3-Piece Open Die Forged Cryogenic Ball Valve

Item Specification
Valve Type Floating Ball Valve, 3-Piece Split Body, Side-Entry, Anti-Static, Anti-Blowout Stem
Size Range DN15 – DN300 (½” to 12″)
Pressure Rating Class 150 / 300 / 600 (PN16 – PN100)
End Connection Flanged Ends (Raised Face / RTJ) per ASME B16.5
Design Standard BS 6364 / ISO 28921-1 / MSS SP-134 / ASME B16.34 / API 6D
Face to Face Standard ASME B16.10 / ISO 5752 / BS 6364 Table 1
Test Standard API 598 / API 6D / BS 6364
Service LNG, LO2, LN2, LAr, Ethylene, Methane, Cryogenic Industrial Gases
Temperature Range -196°C to +80°C (-320°F to +176°F)
Bore Type Full Bore / Reduced Bore (Specify)

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Sự miêu tả

TECHNICAL DATA SHEET

Cryogenic Floating Ball Valve (3-Piece, Flanged Ends, Stainless Steel)

General Information

Item	Đặc điểm kỹ thuật
Loại van	Floating Ball Valve, 3-Piece Split Body, Side-Entry, Anti-Static, Anti-Blowout Stem
Size Range	DN15 – DN300 (½” to 12″)
Xếp hạng áp suất	Class 150 / 300 / 600 (PN16 – PN100)
End Connection	Flanged Ends (Raised Face / RTJ) per ASME B16.5
Design Standard	BS 6364 / ISO 28921-1 / MSS SP-134 / ASME B16.34 / API 6D
Face to Face Standard	ASME B16.10 / ISO 5752 / BS 6364 Table 1
Test Standard	API 598 / API 6D / BS 6364
Service	LNG, LO2, LN2, LAr, Ethylene, Methane, Cryogenic Industrial Gases
Phạm vi nhiệt độ	-196°C to +80°C (-320°F to +176°F)
Loại lỗ khoan	Full Bore / Reduced Bore (Specify)

Bill of Materials (Materials of Construction)

Part Name	Qty.	Vật liệu	Material Specification / Notes
Body Halves	2	Stainless Steel	ASTM A182 F304/F304L (Forged) or ASTM A351 CF8/CF3 (Cast)
Quả bóng	1	Stainless Steel	ASTM A182 F304/F316 (Forged), Chrome Plated / Surface Ra ≤ 0.4µm
Thân cây	1	Stainless Steel	ASTM A182 F304/F316, Anti-Blowout Design
Seat (Downstream)	1	PCTFE / RPTFE	Spring-Energized PCTFE (Preferred for -196℃) or Glass-Filled RPTFE
Seat (Upstream)	1	PCTFE / RPTFE	Optional Bidirectional Design
Stem Seals / Packing	Set	PTFE + Graphite	Live-Loaded Packing (Belleville Springs) at Ambient Zone
Body Gasket	2	PTFE / Spiral Wound	PTFE or SS+Graphite Spiral Wound
Body Bolts & Nuts	Set	Stainless Steel	ASTM A193 B8M (Bolts) / ASTM A194 8M (Nuts)
Thrust Washer / Bearing	1	PTFE / Reinforced PTFE	Reduces operating torque
Thiết bị chống tĩnh điện	1	Stainless Steel	Ball-to-Stem / Stem-to-Body
Stop / Locking Device	1	Stainless Steel	Optional for safety
Name Plate	1	Stainless Steel	MSS SP-25 marking

Material Specifications & Rationale

Thành phần	Vật liệu	Rationale
Body & Bonnet	A182 F304/F316 / A351 CF8/CF8M	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 .
Quả bóng	A182 F304/F316	Hard chrome plating or electroless nickel coating improves surface hardness (Ra ≤ 0.4µm) and ensures low friction against PCTFE seat .
Ghế	PCTFE (Spring-Energized)	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 .
Stem Seals	PTFE + Graphite	Extended bonnet positions packing away from cold zone; live-loading compensates for thermal cycles and prevents fugitive emissions .

Cryogenic Design Features

Feature	Sự miêu tả	Benefit
Extended Bonnet	Length per BS 6364 (e.g., 250mm for DN50) keeps stem packing at ambient temperature .	Prevents ice formation on packing; ensures reliable stem sealing and operation.
Pressure Relief Hole	Upstream-side hole in ball prevents cavity pressure buildup during warm-up .	Eliminates risk of cavity over-pressurization and seat damage.
Thiết bị chống tĩnh điện	Springs/plungers ensure electrical continuity between ball, stem, and body .	Prevents static charge accumulation in flammable cryogenic services.
Blowout-Proof Stem	Stem retained internally by shoulder or retaining ring .	Safety critical: prevents stem ejection under pressure.
Cryogenic Treatment	All pressure-containing parts thermally cycled to -196°C .	Stabilizes microstructure; ensures dimensional stability in service.

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 .*

Kích cỡ	Face-to-Face (L)	Extension Length (E)	Height Open (H)	Handwheel Dia. (D)	Bolt Circle Dia.	No. of Holes
DN15 (½”)	108 mm	180 mm	210 mm	100 mm	60.5 mm (2.38″)	4
DN25 (1″)	127 mm	200 mm	240 mm	125 mm	79.4 mm (3.12″)	4
DN50 (2″)	178 mm	250 mm	310 mm	200 mm	120.7 mm (4.75″)	4
DN80 (3″)	203 mm	280 mm	370 mm	250 mm	152.4 mm (6.00″)	4
DN100 (4″)	229 mm	320 mm	440 mm	315 mm	190.5 mm (7.50″)	8
DN150 (6″)	394 mm	400 mm	570 mm	400 mm	241.3 mm (9.50″)	8
DN200 (8″)	457 mm	450 mm	680 mm	500 mm	298.5 mm (11.75″)	8

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)

Test	Medium	Pressure / Condition	Acceptance Criteria
Shell (Body) Test	Water / Nitrogen	1.5 x Rated Pressure @ Ambient	No visible leakage
Seat (Seal) Test	Air / Nitrogen	1.1 x Rated Pressure @ Ambient	ISO 5208 Class VI (Bubble-tight)
Cryogenic Seat Test	Liquid Nitrogen	@ -196°C, 1.1 x Rated Pressure	≤ 0.1 Nm³/hr (He) per BS 6364 Annex A
Low Pressure Seat Test	Air	0.6 MPa (87 psi)	Bubble-tight
Stem Leakage Test	Helium	@ Ambient	ISO 15848-1 Class B (≤10⁻⁵ mbar·L/s)
Cavity Relief Test	–	Verify ball hole functions	Pressure relief to upstream side

Typical Test Pressures (Class 300 Example):

Shell Test: 7.7 MPa (1,117 psi)
Seat Test: 5.6 MPa (812 psi)

Operating Torque & Actuation

Kích cỡ	Torque @ Ambient (Nm)	Torque @ -196°C (Nm)	Recommended Operator
DN15 (½”)	8	12	Đòn bẩy
DN25 (1″)	15	22	Đòn bẩy
DN50 (2″)	45	68	Lever / Gear
DN80 (3″)	90	135	Gear
DN100 (4″)	160	240	Gear
DN150 (6″)	350	525	Gear / Actuator
DN200 (8″)	600	900	Gear / Actuator

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)

Kích cỡ	Flow Coefficient Cv (US gal/min)	Kv (m³/h)
DN15 (½”)	8 – 12	7 – 10
DN25 (1″)	30 – 40	26 – 35
DN50 (2″)	120 – 150	104 – 130
DN80 (3″)	280 – 320	242 – 277
DN100 (4″)	480 – 550	415 – 476
DN150 (6″)	1,100 – 1,300	952 – 1,125
DN200 (8″)	2,000 – 2,300	1,730 – 1,990

*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

Requirement	Đặc điểm kỹ thuật
Oxygen Service Cleaning	If service is LOX or oxygen-enriched, valve must be cleaned and packaged per CGA G-4.1 with special packaging to maintain cleanliness .
Material Traceability	Full traceability per EN 10204 Type 3.1 required for all pressure-containing parts .
Impact Testing	Charpy V-Notch impact tests at -196°C per ASTM A370 (minimum 41J average) .
PMI Testing	100% Positive Material Identification verification for all alloy components .
Cryogenic Cycle Testing	Optional: 200+ thermal cycles between ambient and -196°C to validate long-term performance.
Vacuum Jacket Compatibility	Extended bonnet length must match insulation thickness for cold box applications.

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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