Kitz Corporation of Europe

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What are VALVES for CRYOGENIC SERVICE?

They are valves with a special design that allow them to be manipulated under extreme temperature conditions. cryogenic temperatures
They are normally considered below -100°C.

One of the main benefits of using cryogenics is that it allows gases to be manipulated in a state
liquid, considerably reducing its volume, reaching reductions of up to 1:600, as is the case
of LNG (liquefied natural gas).

This leads to a reduction in storage spaces, times and
transportation costs. Some of the gases for which these valves are used, see figure 1.

Due to the brittle and brittle nature of carbon steel at low temperatures, this material is not
suitable for cryogenic applications. Carbon steels can be used in low-pressure service
temperature down to approximately -46°C, with appropriate testing and precautions. Most of the
Non-ferrous materials are suitable for low temperature services. stainless steels
Austenitic materials can withstand temperatures down to approximately -275°C.

Main characteristics of cryogenic valves

 

  • Use of stainless steels for cryogenic valves, excluding carbon steels
  • Extension of the press to raise the packing area and prevent it from freezing.
  • Assembly of the shaft by the press (upper) due to its length. 
  • One-way valve, has a pressure relief system, always upstream. KCE designs incorporate a
    decompression in the sphere for small sizes and a spring behind the seat in large sizes.
  • Special gasket materials and design adapted to cryogenic temperatures.
  • Pressure relief between body cavity and extension cavity.
  • High actuation torques due to the rigidity of the seats when reaching cryogenic temperatures.

Figure 1.

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