Bürkert 2012, Руководство по обслуживанию

Страница: 20 / 41

20
Replacing the valve seat
Type 2000, 2002, 2012
8 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 and I: pressurize the lower control air connection with compressed air (5 bar): valve
opens.
→
Using a suitable open-end wrench, place the wrench flat on the tube.
→
Unscrew the actuator from the valve body.
→
Carefully remove old graphite seal from the valve body.
replacing valve seat
→
Unscrew old valve seat using the installation tool and open-end wrench.
information on the assembly tool can be found in chapter “10 Installation tools” .
→
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 “Table 5” ).
Installation tool
Tool insert
(according to nominal
width of seat)
Valve seat
Figure 6: Replacing the valve seat
english