Dependable Cryogenic Service Valve for Liquid Nitrogen and Oxygen Canisters with

Product Specification

Dependable Cryogenic Service Valve for Liquid Nitrogen and Oxygen Canisters with Extended Stem Design

Product Description:

The dependable cryogenic service valve is a uniquely engineered flow control device specifically designed for the extreme conditions of liquid gas canisters, such as those containing Liquid Nitrogen (LN2) or Liquid Oxygen (LOX). Operating at temperatures as low as -196°C (-321°F), standard valves would fail due to material embrittlement and seal contraction. This specialized cryogenic valve features an extended stem, or "cold finger," design that positions the operating mechanism away from the ultra-cold fluid. This critical thermal management feature ensures that the sealing components and handwheel remain at ambient temperature, allowing for safe and reliable operation while preventing the valve from freezing shut. The valve body and extended stem are constructed from high-grade stainless steel that retains its toughness and integrity at cryogenic temperatures, preventing catastrophic failure.

The manufacturing process involves specialized knowledge of low-temperature metallurgy. The extended stem is a single, precision-machined piece to eliminate weak points. All seals are made from advanced polymers like PTFE (Teflon) that remain flexible and sealing at extreme cold. Each valve is subjected to a rigorous testing regimen that includes helium leak detection at room temperature and a cryogenic proof test, where the valve is cycled with liquid nitrogen to simulate real-world conditions. This valve is an essential component for laboratories, medical facilities (for IVF and specimen preservation), and industrial gas suppliers, ensuring the safe handling and controlled dispensing of some of the coldest substances on earth. It provides users with the confidence to manage their valuable cryogenic gases without risk of malfunction.

Bullet Points:

Extended Stem Design: Keeps operating components at ambient temperature for safe, reliable operation and to prevent freeze-up.

Cryogenic Temperature Rated: Constructed from materials certified to perform safely at temperatures as low as -196°C (-320°F).

Positive Flow Control: Allows for precise regulation of liquid gas withdrawal from dewars and storage canisters.

Ultra-Low Leak Rate: Engineered and tested with specialized seals to achieve a near-perfect seal, minimizing product loss.

Durable Cryogenic Valve: Built to withstand the thermal shock and constant contraction/expansion cycles of cryogenic service.

Specific Application Scenario:
In a biological research laboratory, a technician uses this valve on a large liquid nitrogen dewar to safely refill smaller portable containers used to preserve cell lines. The extended stem prevents frost from reaching the handwheel, allowing the technician to easily open and close the valve with gloved hands, controlling the flow of the super-cold liquid without risk of injury.

Specifications:

Exhibition:

We often go to India, Mexico, Algeria for aerosol valve exhibitions. Our potable butane gas stove valves have been exported to Mexico, Ecuador, Viet Nam, India, Colombia, Russia, Ukraine, Indonesia, Peru, Philippines and other countries.

Packing and Delivery

Carton size: 560*370*220mm

Gas valve: 1500 pieces / carton

Red cover: 2500 pieces / carton

We can export the portable gas stove valves to you by LCL container and full 20ft, 40ft, 40HC container. We can use carton packing and pallet packing.

FAQ:

1. Why is the extended stem necessary on a cryogenic valve?

   • The extended stem moves the delicate sealing mechanism away from the extreme cold of the liquid gas. If the stem were short, the seals would freeze solid, and the operator could be severely injured by cold contact when trying to turn the handle.

2. What materials make this valve suitable for thermal management at such low temperatures?

   • The body and stem are typically made from 304 or 316 stainless steel, which maintains excellent strength and does not become brittle at cryogenic temperatures. The seals are made from PTFE or similar materials that retain elasticity.

3. Can this flow control device be used for both liquid and gas withdrawal from a dewar?

   • Yes, the valve can control the withdrawal of liquid or gas (boil-off). The rate and phase are controlled by the pressure in the vessel and the positioning of the dip tube.

4. Is this cryogenic valve compatible with all liquid gases?

   • While suitable for inert gases like Liquid Nitrogen (LN2) and Liquid Argon (LAR), special cleanings and certifications are required for oxidizing gases like Liquid Oxygen (LOX). Always specify the gas service when ordering.

5. What is the maintenance schedule for this type of valve?

   • Maintenance is minimal but should include regular visual inspections for damage and icing patterns. Seals should be replaced by a qualified technician according to the manufacturer's schedule or if a leak is detected.