2
SEMPELL SERIES VSE/VSR FULL LIFT AND NORMAL SAFETY RELIEF VALVE
OPERATING INSTRUCTIONS
3 OPERATION
3.1 Warning indications for the operation
Observe safety regulations!
ATTENTION
Unstable behaviour of safety valves such as
chattering or vibrating can destroy the valve seat,
the safety valve or the pipe and thus causing the
failure of the safety function or the shutdown
of the plant. Therefore, observe regulations
and empirical notes regarding design and
dimensioning, fitting and installation.
ATTENTION
Safety valves with weight loading, Series VSE 4,
areblocked for the transport.
Before commissioning remove blocking stem and
mount gag plug (17) with gasket (40).
2 DESCRIPTION
Spring-loaded full lift safety relief valves are
direct acting safety valves for protection of
pressure tanks against inadmissible excess-
pressure.
A cylindrical compression spring creates the
closing force on the valve disc against the
opening pressure of the medium below the
valve disc. At normal operating conditions the
valve seat is held tight.
By changing the spring compression it is
possible to change the set pressure. In case
of exceeding set pressure, the pressure of the
medium prevails and the safety valve opens.
With full lift characteristic the safety valve
opens rapidly at full lift and discharges the
total mass flow necessary to prevent a further
pressure increase.
With normal characteristic the safety valve
reaches the lift necessary for the mass flow to
be discharged after response within a pressure
increase of maximum 10%.
After a defined pressure decrease, the safety
valve closes again.
By means of the lifting lever at the cap the
safety valve can be opened by hand with a set
pressure of 85% at least.
The safety valves are type tested and comply
with the requirements of the standards and
regulations.
• Design and dimensioning: do not use larger
safety valves than necessary! In case of back
pressure use safety valves with bellows.
• Fitting and installation: lay supply line as
short as possible. Use as few bends as
possible.
• Keep supply line free from vibrations.
Absorb or avoid pressure surges and waves,
e.g.caused by pumps or other valves.
• Drain the discharge line and the valve body at
their lowest point. Condensate can impair the
function of the safety valve.
• Protect lines and valve against freezing.
Use within areas exposed to danger of explosion
The safety valves underwent a hazard analysis
according to code 94/9/EC with the following
result:
• The safety valves do not have a potential
ignition source. ATEX 94/9/EC is not
applicable to these valves.
• The valves safety may be used in the EX range
• Electrical / pneumatically accessories have to
undergo a separate assessment of conformity
according to ATEX.
• The surface temperature does not depend
from the valve itself but from the operational
conditions. Observe while installing.
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