wT 1207/11
Page 10
If the bonnet is provided with a threaded bush (Pos.18), proceed as follows:
•
Tap the tension pin (Pos.19) out of the bonnet (inwards)
•
Clamp the bonnet in the vice unscrew the threaded bush using spindle and hand wheel
(see Fig. 5)
•
Screw the new threaded bush into the bonnet and pin them together *)
*)
When renewing actuating parts, we recommend putting in a new spindle and threaded bush at
the same time
•
Mount the spindle in the piston after thoroughly lubricating the spindle head
with a suitable
lubricant (Metaflux Lubricating Metal Paste 70-85)
•
Mount the spindle into the bonnet and install the hand wheel. Lubricate the bonnet neck and the
spindle
with a suitable lubricant (Metaflux Lubricating Metal Paste 70-85)
Assembling body and bonnet unit
•
Screw spindle with piston into bonnet
•
Position bonnet on valve body, and screw nut by some turns
•
Now close valve completely and open it again (when it opens, the bonnet with draws into the valve
body)
•
Tighten nuts
•
Close valve completely (turn hand wheel clockwise)
•
Tighten bonnet hexagon nuts with torque wrench in diagonal order to specified torque.
For torque specifications, see
Technical Data Sheet Page 12
