Precautions Whenever handling
valves,
take the
necessary precautions
not to
pollute the
vacuum
circuit and, to keep the valve and valve seat free
of particles which create leaks.
The
valve, particularly the sealing
surfaces,
should only be handled
with clean,
lint-free
gloves.
It should only be installed in a clean system.
Dismantling For the valve
assembly/disassembly,
the unit
must
be stopped and
disconnected
from line power
.
If ”piston” O-rings are installed on the valve,
use
a
gasket
extractor to
remove
it.
Take
care not to damage the sealing surface.
Immediately
protect the valve inlet if it is to stay open for a long time.
Cleaning
Clean the
surfaces
of the different
parts
with
alcohol.
For the Normally Open type Minisol
valves
(NO),
O-rings are
present
on both
sides
of the valve.
Improve
the cleaning by blowing off the
parts
with
dry filtered air, particularly the O-ring grooves.
4
/6
Seal
preparation
Place
the ”piston” O-rings.
A slight greasing of
these
rings is possible.
Grease quantity should be limited to avoid
helium
retention
and make
assembly
easier.
Put
a drop of grease on
your fore-finger.
Spread the grease out between your
thumb and fore-finger.
Lay
the grease on the ring by turning it
between your fingers.
The
ring should have a shiny
aspect
with
no excess.
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