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Series GU/F
9.6
Replacement of components
9.6.1 Dismantling of the plug
♦ Undo locking plate 539, dismantle lifting lever 238
and unscrew the lifting cap 535.
♦ Mark the position of the stem nut 534.
♦ Unscrew the self-locking hex. nut 929/1 and stem
nut 534 off the stem 802.
♦ When undoing or tightening the hex. nut, hold the
stem tight with a pair of pliers.
Do not turn the entire stem 802! There is
a risk of the insert sleeve 308 being
unscrewed out of the bellows 206 or the
folds being damaged!
♦ Mount a suitable distance sleeve (not included in
the scope of delivery) over the stem 802.
♦ Screw the stem nut 534 against the distance
sleeve. The plug 204 is lifted off the seat 205 and
the closing force becomes ineffective.
♦ Loosen the bolts 901/1, 936/1, 936/2 and 920/1
from body 100 and spring bonnet 513 and lift the
spring bonnet with internals completely off.
♦ Grip the bellows 206 in the reinforced section just
above the lifting aid 237. Unscrew the lifting aid off
the bellows and remove the plug 204.
9.6.2 Dismantling of the seat
♦ Remove spring bonnet 513 from the body 100.
See Section 9.6.1.
♦ Unscrew seat 205 from the body 100 with a special
wrench. See Section 1.4.
9.6.3 Installation of the seat
♦ Centre the new or reworked seat 205 in the body
100.
♦ First tighten the attachment nuts 920/1 hand-tight
and then with a torque wrench evenly and in
diametrically opposite sequence.
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 completely onto the thread of
the bellows hand-tight.
Counter the bellows 206 on the reinforced section
with a pair of pliers.
9530-020-en
Revision 15
TM 10477
Edition
05/2022
♦ Undo the hex. socket screws 914/1. Centre the
spring bonnet 513 with internals on the body 100.
Ensure that there is metallic contact between the
body and the spring bonnet. Then tighten the
screws 901/1, 936/1, 936/2 and 920/2.
♦ Tighten the hex. socket screws 914/1 for the
bellows seal evenly in line with the tightening
torques in Section 1.3.
♦ 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.
♦ 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 and the bellows and cause corrosion
damage. A defective O-ring must be replaced before
the valve is installed in the plant.
9.7
Tests
Following the assembly of the valve, the stroke and
the test pressure must be checked.
9.7.1 Stroke
Lift check:
♦ Remove the cap nut 927/1 from the lifting cap 535
and determine the height of the stem 802 up to the
upper edge of the lifting cap 535.
♦ Determine this measurement in both the closed
and fully opened state.
♦ Actuate the lifting lever 238 until the mechanical
travel stop can be felt.
The measurement can be made with a slide calliper
gauge and a depth indicator to DIN 862.
The lift is derived from the difference in the two
heights. It must be at least as high as the lift given in
the test certificate.
16
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