Burkert Type 2012 - Manual (Page 12)

12
Replacingthesealset
Type 2000, 2002, 2012
6 ReplacinG The seal seT
6.1 Replacement of the seal set for actuator with
control function a (cfa), B (cfB) and i (cfi)
Danger!
danger – high pressure!
▶ Turn off the pressure and vent the lines before loosening lines or valves.
Risk of injury from improper maintenance!
▶ Maintenance may be performed by authorized technicians only!
▶ To screw on or unscrew valve body or actuator, use an open-end wrench, never a pipe wrench.
▶ Observe tightening torques.
Required parts:
item description item description
21 O-ring 37 Lip seal (actuator size C)
11 O-ring (actuator size C) 30 O-ring
36 O-ring 32 O-ring (lip seal actuator size C)
23 Piston seal 53 Self-locking ring (actuator size C)
13 Chevron seal 5 Graphite seal (packed)
7 Wiper
note!
The actuator must be completely removed to replace all the seals. A special Bürkert assembly sleeve is required
to mount the packing gland.
Do not use any pointed or sharp instruments!
6.1.1 disassembly
→
Mount valve
1
on the body.
Caution!
danger through taut springs!
▶ Carefully open piston actuator!
→
Unscrew cover
31
with special wrench holding up the actuator body
12
against the hexagon.
→
only for actuator size G (100 mm) and h (125 mm): Remove washer
40
.
english