Richter LPV/F Series Low-Pressure Safety Valves - Manual (Page 13)

Series LPV-A/F, LPV-D/F
Seite 13
9530-060-en Revision 01
TM 7464 Edition 02/2009
9.4 Changing the test gauge
pressure
Unscrew bonnet 112.
Remove subassembly shut-off element.
Remove retainer ring 544 and round cord 522.
Push number of weights 239, depending on the
test pressure, onto the plug 204.
See Section 6.5.
Secure with round cord 522 and retainer ring 544.
Install subassembly shut-off element in the body
100.
Screw on bonnet 112 and tighten.
Check test pressure.
Have valve lead-sealed.
The data specified in the data sheet are to be
observed.
9.5 Replacement of components
Always replace the seat 205 and plug 204
completely.
Reworking of the seat and plug requires
specialised knowledge of the materials, their
processing and special lapping wheels. It is
therefore recommended to have this work carried
out by the manufacturer.
After dismantling, check all parts for wear and
damage.
Spare parts are to be ordered with all the details in
acc. with the valve identification.
Only use original spare parts.
9.5.1 Subassembly shut-off element
9.5.2 Dismantling of the plug
Undo screws 901/1 (on the LPV 100/150 902/2)
and 920/2 from body 100 and bonnet 112 and
remove.
Remove bonnet 112..
Remove subassembly shut-off element (without
seat).
Remove retainer ring 544 and round cord 522.
Remove weights 239.
Unscrew lifting aid 237.
9.5.3 Dismantling of the seat
Dismantle bonnet 112 and subassembly shut-off
element from the body 100. See Section 9.5.2.
Only LPV-A/F: Undo screws 902/1 and 920/1 from
inlet nozzle 122 / body 100 and remove.
Remove seat 205.
Only LPV-D/F: For the dismantling and installation
of the seat it is necessary to use the screw-in tool
(it is not part of the valve supply). See Section 1.3.
9.5.4 Installation of the seat
Centre the new or reworked seat 205 in the body
100.
Only LPV-A/F: Then insert the inlet nozzle 122 into
the centring of the body 100.
The components must be smooth running, i.e. can
be centred without any constraining forces.
If necessary, the inlet nozzle is to be turned
through 90°.
First tighten the attachment nuts 920/1 hand-tight
and then with a torque wrench evenly and in
diametrically opposite sequence.
It is imperative to observe the prescribed
torques for the connection body / inlet
nozzle! See Section 1.4.
Only LPV-D/F: Screw-in the seat 1 using the
screw-in tool. See Section 1.3.
9.5.5 Installation of the plug
All parts are to be thoroughly cleaned before
assembly.
Screw lifting aid 237 onto the new or reworked
plug 204.
Push number of weights 239, depending on the
test pressure, onto the plug 204.
Secure with round cord 522 and retainer ring 544.
Install subassembly shut-off element in the body
100.
522
544
239
204
The subassembly
shut-off element
contains of:
522
round cord
544 support ring
239 weights
204 plug
237 lifting aid
237