Wyeco Valves

Wyeco Hyper-Cryogenic Emergency Shut-off Valves

Since 1984, Wyeco has been pushing forward domestic manufacturing of ultraslow temperature vessels with nitrogen as a key ingredient. With high growth during the post-economy era, the industrial use of nitrogen, the use of natural gas, refrigeration industries related with this heat use of: liquid nitrogen, liquid carbon dioxide, related industries of low temperature also grew, in particular, development in the use of nitrogen in semiconductors and in the electronic industry. During the past 20 years, Wyeco have been supplying ultra-low temperature valves. Regarding quality management, Wyeco demands high safety, material inspections (material analysis, tension checks and low temperature spot checks), non-destructive tests (radiation checks, liquid penetration non-destructive tests, ultrasonic non-destructive tests) sub-zero environment, various pressure checks, low temperature checks and oil free treatment and inspections.

Specification Type Globe Type

Material SCS14A

Size 1/2", 3/4", 1", 1-1/2", 2", 3", 4"

Bonnet Standard ( 0°C - +100°C) Extension ( -196°C - +100°C)

Valve Stem SUS316

End connection Flanged End, Socket Welded, Butt Welded

Pressure Rating JIS 10K, 20K, 30K, ANSI 150, 300LB, DIN PN16, 25

Seat Ring Standard -PTFE. Extension -PCTFE

Gland packing PTFE.

Gasket Gylon

Wyeco Hyper-Cryogenic Emergency Shut-off Valve

Hyper-Cryogenic Emergency Shut-off Valves Design Advantages

  • Lightweight and small sized valve housing - To reduce heat loss of the valve housing, the lightweight and small sized valve housing for ultraslow temperature application was specially designed. The welding method of the handle portion is the most suitable processing method.
  • Long bonnet of proper length - if the temperature of the ground portion is below the dew point, it is prone to coagulate with the moisture in the air, causing difficulty in operation. If the temperature is too low the glue loses some of its effectiveness in sealing, which can cause leakage. Consequently, to prevent the heat of the liquid from directly causing this, the long bonnet was specially designed. This length is the most suitable length design based on tests and previous performance.
  • Ideal valve seat (Soft touch) - The SW or BW valve housing use soft touch valve seats so that the piping cannot be taken out easily and the valve seat and valve housing may not be damaged. Disc sealing is using low temperature characteristics that can stabilize 15% of Glass, Teflon and 3FPCTFE, which can be exchanged when necessary. (Metal touch). Liquefied gas lacks lubricity. Using Austenite Stainless as the material, valve housing is designed. The valve seat is molded with the valve body as a whole. The bearing surface uses Stellite metal which largely increases the life.
  • The structure that prevents regasification pressure rise. The body of globe valve uses the flexible type that can be fully sealed. But now if the liquefied gas inside the valve housing is sealed absorbing heat from the outside, it may result in regasification and cause a pressure rise as the temperature rises. To avoid this, the structure of the relief hole was designed on the upper flow measurement.
  • Durable GLAND packing U-Ring molded with durable Teflon can be operated. Light and handy and be used semi-permanently. When necessary, it may be made corresponding to various combinations of Packaging.
  • Gaskets with good low temperature characteristics Gasket is made of GYLON. It has small shrinkage, good compression restoring features and stable low temperature characteristics (-210 - 260°C). When necessary, it can be °C made corresponding to various gaskets.
  • Handling acid gasoline Ultraslow temperature valves are handled using oil-free Trichloroethane when being assembled, which can be used with ease.