DN25-PN16 2-Piece Cryogenic Ball Valve

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)

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TECHNICAL DATA SHEET

Product: 2-Piece Cryogenic Ball Valve
Größe: DN25 (1 inch)
Druckbewertung: PN16 (Class 150)
Gehäusematerial: F304 Stainless Steel (ASTM A182 F304)
Body Construction: 2-Piece, Floating Ball
Seat Type: Soft Seated (PCTFE / PEEK)

Basic Specifications

Parameter	Value
Nenngröße	DN25 (1″)
Druckbewertung	PN16 (Class 150)
Ventiltyp	2-Piece Floating Ball Valve
Karosseriebau	2-Piece (Body + End Cap)
End Connections	Flanged (EN 1092‑1 PN16) / Threaded (ISO 7‑1 / NPT) / Socket Weld
Temperaturbereich	–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)

Main Features

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.
2-Piece Body Construction: Compact design with bolted body joint for easy maintenance. The end cap can be removed to access internal components.
Floating Ball Design: Under pressure, the ball shifts against the downstream seat, providing reliable shut-off.
F304 Stainless Steel: Offers good corrosion resistance and low-temperature toughness, suitable for a wide range of cryogenic media.
PCTFE / PEEK Seats: Provides excellent low-temperature sealing performance with enhanced wear resistance and dimensional stability at cryogenic temperatures.
Anti-Static Device: Ensures electrical continuity between ball, stem, and body to prevent static charge buildup.
Blowout-Proof Stem: Stem is designed to prevent ejection under pressure.
Purge Port (Optional): Provisions for back-venting or purge connections available for safety in oxygen or hazardous services.

Material List (Recommended Cryogenic Configuration)

Item	Part	Standard Material
1	Körper	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	Stängel	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.*

Seat Material Comparison

Seat Material	Temperaturbereich	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

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.

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)

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
Antistatisch	Essential to prevent static discharge in flammable cryogenic services

Operating Guidelines

Orientation: Typically installed with stem vertical; extended bonnet ensures packing remains at safe temperature.
Thermal Conditioning: Before introducing cryogenic fluid, the valve should be slowly conditioned to avoid thermal shock.
Betrieb: 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.
Maintenance: Extended bonnet valves allow packing replacement without removing the valve from the line, as the packing is located above the thermal isolation zone.

Typical Applications

LNG Infrastructure: Liquefied natural gas receiving terminals, loading arms, vaporizers, and storage tanks.
Air Separation Units (ASU): Liquid oxygen, liquid nitrogen, and liquid argon handling.
Petrochemical: Ethylene and propylene plants with cryogenic processes.
Cold Boxes: Cryogenic process modules in gas processing facilities.
Food & Beverage: Liquid CO₂ and nitrogen freezing systems.
Medical: Liquid oxygen and nitrogen storage and distribution.

Ordering Information

When ordering, please specify:

Size: DN25
Pressure Rating: PN16
Body Material: F304
End Connections: Flanged / Threaded / Socket Weld
Seat Type: PCTFE (standard for –196°C) or PEEK (for higher pressure or cycling service)
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.

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