Maintenance
6-4 ULVAC CRYOGENICS INCORPORATED
CAUTION
helium gas to flow out from the charging hose for about half a minute. Meanwhile,
open the charge valve slightly in order to drive out the air that exists between the
charge valve and the charge inlet.
ｄ．Tighten the flair nut at the end of charging hose and close the charge valve.
Helium gas charge in the line between the regulator and the charge valve on the
compressor has been completed.
４．Adjust the outlet pressure of the regulator at 1.8 MPaG. Pressure relief valve has to
be mounted as well as the regulator.
５．Open the charge valve slowly and perform the following instruction according to the
state of the compressor.
a.If the compressor unit is running under normal operating conditions, replenish
it with the pure helium gas until it reaches the operation pressure described in
the compressor instruction manual.
b. If the compressor unit is not running, replenish it with the pure helium gas
until it reaches the static pressure described in the compressor instruction
manual.
If helium gas has been charged more than the prescribed pressure of 1.9MPaG or more,
the pressure relief valve on the refrigerator may be going to work. Therefore charge helium
gas slowly so that the pressure relief valve should not operate. On the other hand, the
pressure relief valve in the compressor unit is set at 2.5MPaG.
6. Close the charge valve after charging helium gas.
7. Close the regulator and remove the charging hose from the charge inlet.
The replenishment work of the gas for the compressor has been completed with this.
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