User manual

8 - 2012
english
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.
Tool insert
(to match seat size
Special tool
Valve seat
Place the attached seat by hand in the housing thread and screw it in.
Tighten to the spedified torque using a torch wrench.
ATTENTION!
For special applications such as for oxygen and analysis, use only the approved
lubricants.
Tightenning torques for seat assembly
Connection Torque
Tolerance
Seat Housing Uncoated
seat
Coated
seat
DN 4-15 DN 15 25 20 + 3
DN 20 DN 20 35 28 + 3
DN 25 DN 25 50 40 + 5
DN 32 DN 32 80 65 + 5
DN 40 DN 40 100 85 + 8
DN 50 DN 50 120 120 + 8
DN 65 DN 65 150 150 + 10
DN 80 DN 80 180 180 + 10
DN 100 DN 100 220 220 + 10