Maintenance; Replacing The Valve Seat - Burkert 2012 Instructions De Service

MAINTENANCE

Replacing the valve seat

Unscrew the old housing seat unsing the special tool and a screwdriver.
Clean the tread and sealing surface inthe housing with compressed air.
Select the correct tool insert and screw it into the tool.
Push the new seat onto the tool, lubricate the thread with high temperature resistant lubricant, e.g.
Klüberpaste UH1 96-402.
ATTENTION!
For special applications such as for oxygen and analysis, use only the approved
lubricants.
Place the attached seat by hand in the housing thread and screw it in.
Tighten to the spedified torque using a torch wrench.
Tightenning torques for seat assembly
Thightening torque
DN
10-15
20
25
32
40
50
65
8 - 2012
[Nm]
25 +3
35 +3
+5
50
80 +5
+8
100
120 +8
150 +10
Special tool
Tool insert
(to match seat size
Valve seat