Xsz 8 – Norgren XSZ Series User Manual

Page 10

N/en 5.14.100.10

XSz 8 ... 50

Our policy is one of continued research and development. We therefore reserve the right to amend,

2002-5313h

10/14

For external indication (e.g. visual, electrical or acoustic
signal) of a malfunction, the installation of a failure indication
element is recommended. Such an element is not necessary
to fulfil the safety function of the valve. (For further information
please see the corresponding data sheet no. 5.14.420).
A suitable air treatment unit (dehydration, filtration, lubrication)
must be connected upstream of pressure port 1(P). Lubrication
can only be omitted if the connected consuming device and
all additional equipment is suited for oil-free operation.
Degree of filtration: 25 µm. The lubrication should be adjusted
to supply only enough oil to form a film on the valve spool and bore.
Excessive lubrication may cause a build-up of oil in the pilot
lines and cause sluggish operation of the valves.The size of
pressure regulator, lubricator and filter must be consistent
with the inlet port size. An accumulator tank is recommended
between the pressure regulator and safety valve. The operating
pressure must not drop below 2 bar and the use of a pressure
switch is suggested. Safety valves must be installed as close
as possible to the clutch and brake.
Caution: Non controllable elements such as quick exhaust valves,

nozzles, non return valves, etc. must not be mounted between safety
valve and clutch brake. It is the responsibility of the purchaser and/
or installer of the Norgren Herion safety valves to make sure that
the valve and all other components comply with all relevant national
regulations and the specifications of the local safety associations.
The valves should be checked at intervals depending on the loads
to which they are subjected, at least, however, once a year. The relevant
tests must be carried out according to the corresponding operation and
maintenance instructions of the unit and the local safety regulations.
In case of malfunctions the unit has to be tested and/or replaced
immediately. Repairs and maintenance must only be carried out by
the after-sales service of the valve manufacturer or by a qualified
engineer trained by the valve manufacturer. Important for use at
presses: The combination with the electrical press control must meet
the DIN EN ISO 13849-1 requirements. If two separate valves are used
to control the clutch and brake, please observe data sheet no. 5.14.420.

All liability is denied for unauthorised modification of the units,
installation or usage not in accordance with the manual, the local
safety requirements and the principles of DIN EN ISO 13849-1.

Warning

These products are intended for use in industrial compressed
air only. Do not use these products where pressures and temperatures
can exceed those listed under
‘Technical features’.
Before using these products with fluids other than those specified,
for non-industrial applications, life-support systems, or other
applications not within published specifications, consult NORGREN.

Through misuse, age, or malfunction, components used in
fluid power systems can fail in various modes.

The system designer is warned to consider the failure modes
of all component parts used in fluid power systems and to provide
adequate safeguards to prevent personal injury or damage to
equipment in the event of such failure.
System designers must provide a warning to end users in
the system instructional manual if protection against
a failure mode cannot be adequately provided.
System designers and end users are cautioned to review specific
warnings found in instruction sheets packed and shipped with
these products.