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High-Performance bellows Valves for cryogenic gases and liquids

Cryogenic bellows valves are specialized valves engineered to control the flow of cryogenic fluids at extremely low temperatures. These valves are indispensable in industries where gases such as hydrogen, oxygen, nitrogen and argon. They must be handled at cryogenic temperatures in order to:

  • store and transport gas more efficiently
  • use in industrial refrigeration and food preservation
  • supply energy in large quantities

Rotarex offers a range of bellows valves specially designed for:

  • Withstand extreme temperatures down to -270°C
  • Withstand high pressures up to 240 bar

Each valve requires certain adaptations to deliver optimum performance under specific conditions. Whatever your needs, Rotarex has you covered. Explore our blog to discover which valve is best suited for your application.

SAFETY & QUALITY



A FULL RANGE OF VALVES

UHP Solutions

Bellows & check valves

  • Bellows low to high pressure valve for HP, UHP, corrosive gases and fluids – K300
    K300
    Bellows valve
    Low or high pressure
    -40°C to + 120°C (ambient)
  • Bellows high pressure valve for HP, UHP, corrosive gases and fluids – HP2000
    HP2000
    Bellows valve
    High pressure
    -40°C to + 120°C (ambient)
  • Bellows low to high pressure valve for HP, UHP, cryogenic gases and fluids – K900
    K900
    Bellows valve
    Low to high pressure
    -196°C to + 250°C (cryogenic)
  • Bellows high pressure valve for HP, UHP, cryogenic gases and fluids – HP9000
    HP9000
    Bellows valve
    High pressure
    -196 °C to + 250°C (cryogenic)
  • Bellows high pressure valve for HP, UHP, corrosive gases and fluids – HP3000
    HP3000
    Bellows valve
    High pressure
    -40°C to + 120°C (ambient)
  • Bellows low pressure valve for HP, UHP, cryogenic gases and fluids – SUPRA
    SUPRA
    Bellows valve
    Low pressure
    -270°C to + 80°C (cryogenic)
  • Spring type check valve for HP, UHP, cryogenic gases and fluids – CAR(S)
    CAR(S)
    Check valves
    Low to high pressure
    -196°C to +250°C (cryogenic)

How Do Cryogenic Bellows Valves Work?

A cryogenic bellows valve uses a welded metal bellows assembly to isolate the valve stem from the cryogenic fluid. The bellows acts as a hermetic, flexible barrier between the stem and the valve body. This construction ensures reliable sealing through thousands of thermal cycles and high pressure variations.

The extended stem design positions the actuator above the cold zone. This prevents frost formation and maintains smooth operation even at temperatures approaching absolute zero.

How Do Cryogenic Bellows Valves Work?
Cryogenic Applications: Which Industries Use These Valves?

Cryogenic Applications: Which Industries Use These Valves?

Cryogenic bellows valves are essential in any industry requiring safe handling of cryogenic fluids. Key sectors include:

  • Transportation and storage of liquefied gases
  • Semiconductor manufacturing
  • Nuclear gas systems
  • Industrial refrigeration and food preservation

In liquid helium and liquid nitrogen systems, even the smallest leak can compromise process integrity and create safety hazards. Specialty gas systems requiring ultra high purity also depend on bellows sealed valves to prevent contamination.

Benefits of Bellows Sealed Valves

The primary advantage of a bellows sealed valve is the permanent elimination of external leakage at the valve stem. Traditional packing seals degrade rapidly under cryogenic thermal cycling. A welded bellows seal maintains hermetic integrity over the full service life without maintenance intervention.

Stem leakage is identified as the leading cause of unplanned shutdowns in cryogenic installations. Bellows sealed designs reduce this risk to near zero.

Additional benefits include:

  • Superior cycle life compared to packed stem valves
  • Full compliance with safety and environmental standards
  • Zero contamination risk for ultra high purity and nuclear applications
Benefits of Bellows Sealed Valves
Frequently Asked Questions
What fluids can cryogenic bellows valves handle?

Rotarex cryogenic bellows valves are compatible with liquid nitrogen, liquid oxygen, liquid helium, liquid hydrogen and liquefied natural gas.

Materials and design are selected to ensure safe operation for each specific medium and pressure class.

What is the temperature range for cryogenic bellows valves?

The Rotarex range covers operating temperatures from 270oC below zero to +250oC.

This makes these valves suitable for the full spectrum of cryogenic service, including liquid helium transport and semiconductor manufacturing.

What are the benefits of a bellows sealed valve compared to a packed stem valve?

A bellows sealed valve eliminates the risk of stem leakage, which is the primary failure mode in cryogenic packed stem valves.

It also delivers a longer service life and significantly reduces maintenance requirements over the lifetime of the installation.

How can I request a quote for cryogenic bellows valves?

Submit a request directly through the Rotarex contact form.

Our Rotarex team will identify the most suitable valve model based on your pressure, temperature, connection type, and media requirements.

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