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. OKS 1110.
Place the attached seat by hand in the housing thread and
screw it in.
Tighten to the spedified torque using a torch wrench.
8
Special tool
Tool insert
(to match seat size)
Valve seat
Tightenning torques for seat assembly
DN
4-15
20
25
32
40
50
Tightening torque
+3
25
+3
35
50 +5
+5
80
+8
100
120 +8
Operating Instructions No. 804 072