2.1 Intended use
XSz series safety valves are used to control
hazardous movements in pneumatic safety
systems with category 4 control require-
ments per ISO 13849-1 with performance
level „e“. The valves are only intended to
use in large scale stationary industrial tools
or plants. The valve must not be used in
explosive zones/areas. The DGUV-certifi-
cate covers the press safety valve and the
press afety valve with fitted safety silencer,
manufatured by NORGREN
2.2 Not intended use
The use of the valve is in the following cases
not intended
:
•
The valve is used outside the specified
operational values. The permitted
temperature- and pressure ranges are
exceeded.
•
Damages on the valve have been
noticed, but the valve is still in operation.
•
The valve has been structurally changed
without permission of the manufactu-
rer.
•
The safety instructions in this documen-
tation have not been observed.
•
The valve is used in explosive zones/
areas.
•
A noise reduction measurement has not
been applied.
•
The safety valve has been disassembled
or single parts separated/exchanged.
•
The safety valve is used as a climbing
assist.
•
XSz 5/2-way double valves are not sui-
table for the control of clutch and brake
on mechanical presses.
•
Pneumatically actuated 3/2- and
5/2-way double valves are not suitable
for the control of clutch and brake on
mechanical presses.
!
WARNING
Clogging of silencers
Dirt can cause malfunction of the safety
silencer.
´
Check for adequate air quality.
2.3 General risks
The following section lists residual risks which
may be present even if the safety valves are
used correctly.
!
DANGER
Danger caused by hazardous
movements
When the power is switched
off or if there is a power cut
the loads supported by the safety valves
can drop and the system can lose pres-
sure. This can cause serious injuries..
´
Provide additional mechanical saf-
ety devices that prevent hazardous
movements after the power is switched
off.
!
CAUTION
Danger of injury caused by hot
surfaces
The safety valves can become
very hot during
operation. Skin contact with hot surfa-
ces causes severe burns.
´
When working near hot surfaces,
always wear heat-resistant protective
clothes and protective gloves.
´
Before you start any work, make sure
that all surfaces have cooled to ambient
temperature.
2
General safety instructions
This section provides an overview of all major safety aspects for the protection of people
and for safe, fault-free operation. Further task-related safety notices appear in the sec-
tions on transportation, installation, checks before initial operation, and maintenance. The
safety instructions are related to the valve itself. In combination with other machine parts,
additional potential risks might occure which must be evaluated in a risk assessment of the
complete machine. The limitations of temperature, pressure ranges, must not be exceeded.
Incorporating
XSz8 - XSz50; XSz8V - XSz10V
02/22
Our policy is one of continued research and development. We therefore reserve the right to amend,
without notice, the specifi cations given in this document. © 2014 Norgren Ltd
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