Burkert Type 2012 - Manual (Page 21)

21
Maintenance,Cleaning
Type 2012
→
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. 5”).
tightening torque for installation of seat
screw connection tightening torques
tolerance
seat Body uncoated
seats
coated
seats
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
Tab. 5: Tightening torque for installation of seat
10 malfuncTiOns
malfunction reason remedial action
Actuator
does not
switch Pilot air port
interchanged
→
Connect lower (CFA,
CFI) or upper (CFB,
CFI) control air
connection
Pilot pressure too low →
Observe pressure
specifications on the
type label
Medium pressure too
high
Flow direction reversed
→
Observe direction
arrow on the body
Valve is not
sealed Dirt between seal and
valve seat
→
Installing dirt trap
Seat seal worn
→
Installing new seat seal
Flow direction reversed
→
Observe direction
arrow on the type label
Medium pressure too
high →
Observe pressure
specifications on the
type label
Pilot pressure too low
Valve is
leaking on
the release
bore Packing gland worn
→
Renew packing gland
or replace actuator
Tab. 6: Malfunctions
english