Installation
2.6 Mounting the flexlines
Information for working with self-sealing couplings
The connector lines and elements are equipped with
self-sealing couplings. These connectors can be atta-
ched and detached without helium escaping.
Unscrew the protective caps from the couplings. Keep
the protective caps for further use.
Check all connectors for evidence of dust and grime and,
if necessary, use a clean and lint-free cloth or a soft,
clean brush (e.g. toothbrush) to clean the fittings.
Never use solvents to clean the connections! The fit-
tings shall never be greased or oiled.
Check that the flat seals are in place on male couplings.
Replace missing or defective flat seals.
Use only the supplied open-end wrenches, or open-end
wrenches approved by Leybold, to mount flexlines.
Attach or detach flexlines only when the compressor unit
is switched off and when the pressure is below 28 bar
(406 psig; 2.8 MPa).
Never twist flexlines.
Use one wrench to screw down the coupling and a
second to stabilize the connector nipple; see figures 13
and 14.
1/2” coupling:
tighten with 1
3
/
16
” wrench,
stabilize with 1” wrench.
Tighten down all couplings as far as possible and then
back them off by 1/4 turn to relieve strain.
If the flexlines are to be laid in such a way that radii of
less than 20 cm (8“) are required, it will be necessary to
install 90° elbows; see Section 1.4.
Use insulating adapters for electrical installation; see
Section 1.4.
Use hose couplers to extend the flexlines; see Section
1.4 for details.
Connect compressor unit and cold head
Follow the instructions for the work.
Connect the flexlines in sequence, (15/1) to (15/4), cor-
responding to the direction in which the helium flows.
Caution Do not mix up the high- and low-pressure
connections. Interchanging these connec-
tions can cause damage inside the cold
head.
Do not use a flexline on the high-pressure
side which was ever used on the low-pres-
sure side.
Do not connect the high-pressure connec-
tion directly to the low-pressure connection
(short-circuit). Operation with directly
connected high- and low-pressure can
damage the compressor unit.
Checking the helium filling pressure
After installation, check the helium filling pressure at
the pressure gauge and correct it if required; see
Section 4.1 for the correct data and the filling or
reducing procedure.
Detach flexlines only with the compressor unit switched
off, the cold head warmed up, and when the pressure is
below 28 bar (406 psig; 2.8 MPa). See Section 3.4
“Removing from service“ for details. Detach the flexlines
by unscrewing the couplings in reverse order.
Once they have been detached, fit protective caps on
the couplings.
20
GA 12.137/2.02 - 05/2002
Fig. 13 Mounting the self-sealing couplings
Stabilizing wrench
Wrench for tightening
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