Burkert Type 2012 - Manual (Page 17)

17
Maintenance,Cleaning
Type 2012
9.3 replacing the valve seat
remove the actuator from the valve body
→
Clamp the valve body in a holding device.
note!
damage to the seat seal or the seat contour!
▶ When removing the actuator, ensure that the valve is in open
position.
→
Control function A: pressurize the lower control air connection
with compressed air (6 bar): valve opens.
→
Using a suitable open-end wrench, place the wrench flat on the
tube.
→
Unscrew the actuator from the valve body.
replacing valve seat
→
Unscrew old valve seat using the installation tool and open-end
wrench.
→
Clean thread and sealing surface in the body using compressed air.
→
Select tool insert and screw into the installation tool.
→
Attach new valve seat to the installation tool.
→
Grease thread with a lubricant (e.g. Klüber paste UH1 96-402).
→
Place attached valve seat on the body thread and screw on by
hand.
→
Using a torque wrench, tighten to the specified tightening torque
(see “Tab. 2”).
Installation tool
Tool insert
(according to nominal
width of seat)
Valve seat
Fig. 7: Replacing the valve seat
tightening torque for installation of seat
screw connection tightening torques
tolerance seat Body uncoated
seats
coated
seats
DN 65 DN 65 150 150 +10
DN 80 DN 80 180 180 +10
DN 100 DN 100 220 220 +10
Tab. 2: Tightening torque for installation of seat
english