Checking The Operation Of The Safety Valve - Leser 4401 Instrucciones De Servicio

Operating Instructions
manually between 3% and 15%. The usual
factory setting without a special request
from the customer is between 3% and
7%. The blow-down setting is secured by
a seal.
The test can take place during operation for
pilot-operated safety valves with a pilot test
connection. The correct test medium must
be used. After the pilot has executed the
switching operation, the main valve lifts. In
the process, the medium must be drained
off securely. After testing, check whether
the safety valve is leak-free. The pilot test
connection must be secured again against
impurities with the sealing cap (only B).
For pilot-operated safety valves without a
pilot test connection, the test must be per-
formed on a test bench (only B).
Depending on the fluid and operating con-
ditions, the moving guide surfaces and soft
seals could become gummed up during
blow-off (only B).
Pilot-operated safety valves are not suit-
able for fluids with a tendency to gum up
(only B).
If the safety valve is leaky because of a
damaged sealing surface, it must be ser-
viced. Vent the safety valve and blow off
the medium.
If the safety valve is leaky because of a
damaged sealing surface, it must be ser-
viced.
Vibration in the system may cause compo-
nents to become loose. Screw connections
must be checked regularly.
The maintenance intervals are dependent
on the conditions of use. Therefore, there
are separate maintenance intervals for all
safety valves that must be defined in con-
sultation with the operator, the manufac-
turer and the notified body.
The maintenance intervals become shorter
if:
• corrosive, aggressive or abrasive media
are used,
• a safety valve opens frequently.
A supplementary loading system must be
checked at least once a year.
8.2 Checking the Operation of the
Safety Valve
Different steps are required for testing dur-
ing operation, depending on the system
and type of safety valve. Only the essential
steps are summarised and given in the fol-
lowing handling instructions.
The handling instructions
intended to provide a rough orientation.
The details must be taken from the type-
specific guides.
WARNING
For media discharging at high speed,
high temperature and high loudness
level
Danger of injury and hearing damage
• Wear protective equipment.
• Wear ear protection.
EN
are only
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