Flexible helium transfer lines
The Janis flexible helium transfer line (Model FHT) provides a convenient and efficient method of cooling and filling most research cryostats. Inside each Janis FHT is a length of flexible metal tubing surrounded by multiple radiation shields and vacuum insulation. Specially constructed spacers prevent the inner line from contacting the outer vacuum jacket for maximum efficiency during operation. The flexible section has a 12 in bend radius. The Model FHT is available in single and double right-angle leg configurations and can be manufactured to custom specifications upon request. Two uninsulated extension tips are supplied with each FHT which allow the line to be used with large capacity LHe storage Dewars or tall research cryostats. Each FHT includes a reliable valve used to evacuate and seal the insulating vacuum space. Foot valves and in-line LHe valves can be supplied with these transfer lines, as well as for bayonet joints for unusual geometries.
Replacement high-efficiency transfer lines for your SuperTran or SuperTran-VP cryostat are available. The FHT-ST transfer lines include a built-in flow valve and a charcoal cryopump. Please note that these transfer lines are optimized for use with a continuous flow style cryostat and are not suitable for transferring large volumes of liquid helium.
Standard flexible liquid helium transfer line (Model FHT)
Bayonet flexible liquid helium transfer line (Model FHT-BAY)
Below are stand-alone images of the model FHT-BAY flexible transfer line and its delivery line, as well as showing both these items mid-assembly and completely assembled.
Double right angle flexible liquid helium transfer line (Model FHT-DRA)
High-efficiency flexible liquid helium transfer line for continuous flow cryostats (Model FHT-ST)
Optional upgrades
This photo shows the storage Dewar leg of a special model FHT-ST liquid helium transfer line. This version includes a special drum dial with an indicator that allows the user to see how many degrees the valve has been opened. A small wire welded onto the rigid section of the line is used to indicate the angle. This is an option Janis can include on most SuperTran lines for an additional fee.