Burkert 2712 Manuel D'utilisation page 15

M S
AINTENANCE AND
Malfunctions
Possible malfunctions concerning the actuator are listed in the operatinginstructions for the Top Control .
ATTENTION!
Repairs to the actuator may only be carried out in the factory. Contact your Bürkert
branch or our Customer Service directly:
Replacing the control cone
On the fluidic side, the control cone can be replaced in case of wear or damage. For this purpose, the
actuator must be disassembled from the housing.
Disassembly
Remove the electrical and pneumatic supplies from the TopControl.
Pull off the pneumatic hose between TopControl and actuator at the
control port of the latter.
Control function A:
Pressurize the lower control port of the actuator with compressed
air (6 bar), so that the control cone is liftet from the valve seat and
is not damaged.
Control function B:
With control function B, no compressed air must be applied for this
purpose.
Remove the actuator in the open valve position by unscrewing the
threaded nipple from the housing.
Replacing the control cone:
Knock out the dowel pin with a suitable driver.
Driver diameter:
Pull off the control cone with the aid of two metal strips of equal
height that are clamped to the left and right of the spindle between
the control cone and the threaded nipple of the actuator. To pull off
the control cone, apply compressed air (approx. 6 bar) to the lower
control connection of the actuator.
Place the new control cone onto the end of the spindle.
Align the bores to each other.
ATTENTION!
Do not damage the sealing surface or the control
contour!
12 - 2712
V
ERVICING OF THE ALVE
up to DN 25
from DN 32 to DN 65
Bürkert Fluid Control Systems
Service Department
Chr.-Bürkert-Str. 13-17
D-76453 Ingelfingen
Tel.: (07940) 10-111
Fax: (07940) 10-448
E-Mail: info@de.buerkert.com
φ 4 mm
φ 5 mm
threaded nipple
dowel pin
control cone