Corrosion Protection; Maintenance; Identification Of Safety Valves; Lever Safety Valves - Leser 411 Instructions De Service

12.13 Corrosion protection

Moving parts and parts important to the
operating of the valve must not be impaired in
their motion, e.g. the blowing-off chamber.
The spindle guide must not be varnished.
The supplementary loading system must not
E
be coated with protective paint (refer also to
section 15).

12.14 Maintenance

Safety valves may only be serviced by skilled
staff.
Maintenance intervals cannot be specified by
LESER as they depend on many factors:
•
Corrosive, aggressive and abrasive media
lead to rapid wear and require shorter
maintenance intervals
•
Frequent
maintenance intervals
•
Maintenance intervals have to be agreed
between the operator, the inspector and
the manufacturer. Inspections must be
carried out at the time of the regular
external and internal checks of the
pressure equipment.

12.15 Identification of safety valves

Before
documentation must be checked in order to
ensure that the correct valve has been
selected for the assembly.

12.16 Lever safety valves

The set pressure of lever safety valves is
defined by the mass and the position of the
loading weights. It is not allowed to change
them.
No additional loading weights must be added.
The lever must not be used for suspending
any parts, e.g. for hanging clothes on.
13 Setting instructions for spring loaded
safety valves
The following operating instructions only apply
to valves without additional equipment. If there
is additional
dampers, proximity switches, bellows, ...)
please refer to the corrosponding assembly
instructions.

13.1 Lifting device H3

1. Remove shaft (40.4).
2. Pull lever (40.6) out to the side.
3. Loosen hexagonal head screw (40.3).
4. Unscrew and remove lever cover (40.1).
5. Loosen lock nut (19).
26
operating requires
assembling safety valves
equipment (such as
1)
6. Turn adjusting screw (18) to the
required set pressure.
Pay attention to the admissible pressure
range of the spring!
Clockwise turning of adjusting screw
increase the spring tension, giving a
higher
turning of adjusting screw reduces the
spring
pressure.
7. Reassemble in reverse order and lock at
the set pressure.
shorter

13.2 Lifting device H4

1. Loosen the spring cover (40.1.1) and
simultaneously press the lever (40.1.6) in
the direction of the bonnet so that the
the
lifting fork (40.1.5) comes free.
2. Remove the lever cover (40.1.1).
Loosen the lock nut (19).
1)
3. Turn adjusting screw (18) as described
in lifting device H3. Pay attention to the
admissible pressure range of the spring!
4. Reassemble in reverse order and lock at
the set pressure.
O-ring

13.3 Spring replacement

The following items refer to the figures shown
on pages 3/40-3/42 of LESER's Complete
Catalogue.
1. Loosen the existing lead seal.
2. Press the lever (40.6) towards the middle
until it reaches the stop so that the lifting fork
(40.5) no longer holds the spindle cap
(40.12).
set pressure. Anticlockwise
tension, giving a lower
Fig. 1
Fig. 2
set
26