Richter KSEA/F Series Safety Valves - Manual (Page 15)

Series KSEA/F
Page 15
9530-052-en Revision 03
TM 7128 Edition 05/2008
9.6.2 Dismantling of the seat
Remove bonnet 513 from the body 100.
See Section 9.6.1.
Dismantle inlet nozzle 122 from the body 100 and
remove the seat 227
.
9.6.3 Installation of the seat
Insert the new or reworked seat 205 at the bottom
into the corresponding centring of the body 100.
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 1.2.
9.6.4 Installation of the plug
All parts are to be thoroughly cleaned before
assembly.
Centre the new or reworked plug 204 in the lifting
aid 237 and screw hand-tight onto the bellows
thread. Counter the bellows 206 at the
reinforced section.
Undo the hex. socket screws 914/1. Centre the
bonnet 513 with internals on the body 100. Ensure
that there is metallic contact between the body and
the bonnet. Then tighten the screws 901/1, 936/1,
936/2 and 920/2 (on KSEA/F 4"/6" 902/1, 934/1,
936/1 and 920/2).
Tighten the hex. socket screws 914/1 for the
bellows seal evenly in line with the tightening
torques.
Undo stem nut 534.
Remove distance sleeve.
Screw stem nut 534 onto the stem 802 up to the
marking. Then counter with the self-locking hex.
nut 929/1.
When screwing on and countering the hex. nut
with self-locking feature 929/1, carefully hold the
spindle tight with pliers to prevent it from turning.
Do not turn the entire spindle 802!
There is a risk of the folds in the bellows
206 or the spring-type pin 939/1 being
damaged!
Screw on lifting cap 535 and mount lifting lever 238
with locking plate 539.
9.6.5 Installation of the thrust ring
Make sure that the O-ring 400/1 is positioned
completely inside the groove of the pressure ring 124
so that it is not damaged when the thrust ring is
inserted into the thrust flange 117.
If the O-ring 400/1 has been damaged by improper
assembly, water may enter from outside into the valve
mechanism.
The bellows and cause corrosion damage. A defective
O-ring must be replaced before the valve is installed
in the plant.
9.7 Dismantling KSEA/F 100/150
Caution: During dismantling of the entire
KSEA/F, the nuts of the fitting between the
body and the inlet nozzle must under no
circumstances be undone – Risk of accident!
The springs must firstly be completely relieved!
9.7.1 Dismantling of the entire upper
section / Removal of the seat and
plug
To remove the seat and plug undamaged, the plug
204 must be lifted off the seat 205.
Unscrew the cap nut 927/1 from the lifting cap 535
and remove the cap.
Unscrew the hex. nut with self-locking feature
929/1 and the stem nut 534 off the spindle 802.
When loosening and unscrewing the hex. nut with
self-locking feature 929/1, carefully hold the
spindle tight with pliers to prevent it from turning.
Do not turn the entire spindle 802!
There is a risk of the folds in the bellows
206 or the spring-type pin 939/1 being
damaged!
Lifting plug off the seat
Mount a spacer sleeve (approx. 11.4” (35 mm)
long) on the end of the spindle 802 and screw on a
nut and counter it with another hex. nut. (Not
included in scope of delivery).
Grease the end surfaces of the spacer sleeve well
so that these surfaces cannot "seize" when raising
the adjusting screw 538.
The spacer sleeve may also be replaced by hex. nuts.
See Fig. 17.