Replacement Of Valve Seat - Burkert 2712 Instructions De Service

M S
AINTENANCE AND

Replacement of valve seat

To replace the valve seat, the drive unit must be disassembled from the housing.
Disassembly:
Remove the electrical and pneumatic supplies from the TopControl.
Pull off the pneumatic hose between TopControl and drive unit at control connection of drive unit.
In the case of control function A, pressurize the lower control connection of the drive unit with compressed air (5 to 7 bar) so
that the control cone lifts from the valve seat and is not damaged. With control function B, no compressed air must be applied
for this purpose.
Remove the drive unit in the open valve position by unscrewing the threaded nipple of the housing.
Before reinstalling the drive (in open valve position), grease the nipple thread with stainless steel lubricant, e.g. silicone
grease CKS 1110 from OKS, Munich and replace the graphite seal.
Replacement of valve seat:
Unscrew the old housing seat using the assembly tool and a
spanner.
Clean thread and sealing surface in the housing with
compressed air.
Select a tool insert and screw it into the assembly tool.
Push the new seat onto the assembly tool, grease the thread
with stainless steel lubricant, e.g. „Klüberpaste UH1-96-402"
from Klüber Lubrication.
Place the attached seat by hand into the housing thread and
screw it in.
Tighten the seat with a torque wrench to the torque specified.
HINWEIS Bei Einbau eines Ventilsitzes mit anderer Nennweite, ändert sich die Bestellnummer für das Ventil!
MS 4
V
ERVICING OF THE ALVE
Assembly tool
Tool insert (depending
on nominal diameter of
seat)
Valve seat
Operating Instructions No. 803 800