Vetus EHPDxxR series Installationsvorschriften Seite 11

Check valve:
Insert the fittings into
the check valve by
using appropriate
copper or aluminum
gaskets.
Installation of tubes or pipes
The individual components of the hydraulic control unit must be
interconnected by a nylon pipe or a nylon tubing or by using a
(copper or steel) pipe.
In order to limit the specific resistance, make sure that the con-
necting sections are as short as possible.
In conjunction with the ventilation of the system, the horizontal
sections should be installed with a gradient of approximately
3 cm (1.2") per meter. The pump side should be higher than the
cylinder side.
While installing the pipes or the tubes, try to limit the risk of
external damage or corrosion (in the case of metal pipes)
respectively the risk of attack by chemicals or high tempera-
tures (that may damage nylon pipes and nylon tubing).
Protect the pipes or the tubes that must be led through bulk-
heads by using appropriate bulkhead lead-throughs or bulk-
head couplings.
Make sure that the bends are absolutely free of flaws; a kink in
the pipe reduces the free flow of the hydraulic oil.
If copper or steel pipes are used, use 'internally cleaned' pipes.
Avoid long straight sections of copper or steel pipe; the length
of the pipe is affected by the ambient temperature.
In conjunction with the cylinder's freedom of movement, the
cylinder must always be connected via two sections of flexible
nylon pipe or nylon tubing.
These two pieces of flexible nylon pipe must be at least 50 cm
(20") long and must be installed with a large bending radius.
After installation, blow through the pipes with nitrogen gas or
(pressurized) air to check for possible obstructions and to
remove any contaminates.
The minimum bending radius of nylon tubing is:
- 75 mm (3") (internal radius 6 mm, external radius 10 mm)
- 90 mm (3.5") (internal radius 8 mm, external radius 12 mm)
Always fasten the tubing or the pipe with clamps, preferably
made of plastics; the clamp distance should be approximately
60 cm (24").
Electro-Hydraulic Pumps EHPD and EHPE
To shorten pipes or tubing,
always cut off the required
section.
Never cut off piping or tub-
ing by using a saw (to pre-
vent sawdust from entering
the hydraulic system,
which will invariably cause
problems) or by shearing
(since this will cause
excessive tube deforma-
tion).
After cutting off copper or steel pipe sections, remove the burrs.
ENGLISH
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