Burkert 2301 Manuel D'utilisation page 33

Maintenance, Cleaning
Fig. 19: Replacing the valve seat
replacing the valve seat
→
Unscrew the old valve seat using the installation tools and a
spanner.
→
Clean the thread of the body and the sealing surface with com-
pressed air.
→
Select the correct tool insert and screw it into the installation
tool.
→
Place the new valve seat onto the installation tool.
Type 2301
Installation tool
Tool insert
Valve seat
Warning!
danger if incorrect lubricants used!
Unsuitable lubricant may contaminate the medium. In oxygen
applications there is a risk of an explosion!
• In specific applications, e.g. oxygen or analysis applications, use
appropriately authorised lubricants only.
→
Grease the thread of the valve seat with stainless steel lubricant
(e.g. with Klüber paste UH1 96-402 from Klüber).
→
Manually screw the fitted valve seat into the thread of the body.
→
Screw the valve seat in place using a torque wrench. Observe
the tightening torque (see „Tab. 13: Tightening torques for valve
seat installation").
tightening torques for valve seat installation
dn tightening torque [nm]
Valve seat coated
4 – 15 20 ±3
20 28 ±3
25 40 ±5
32 65 ±5
40 85 ±8
50 120 ±8
Tab. 13: Tightening torques for valve seat installation
english
33