Burkert Type 8644 - Manual (Page 64)

64
Maintenance, Troubleshooting
Malfunction possible cause remedial action
Valves switch with
a delay or blow off
at the deaeration
connections Inadequate or no pressure supply Design the pressure supply with the largest
→
possible volume (even for upstream devices
such as pressure controllers, maintenance
units, shut-off valves, etc.)
Minimum operating pressure ≥ 2.5 bar
Valves are not in home position
(de-energized) during pressure
build-up Pressurize the valve block before you switch
→
the valves.
Deaeration of the exhaust air ducts
inadequate due to too small or dirty
silencers (back pressures). Use appropriately sized silencers or
→
expansion tanks. Clean dirty silencers.
Impurities or foreign objects in the
pilot valve or main valve Change the valve.
→
Leaking valve blocks Missing or crushed O-rings
between the modules;
Missing or incorrectly positioned
profile seals between valve and
pneumatic base module Determine the leaks or missing seals.
→
Insert missing seals or replace damaged
→
seals.
Maintenance of components 9.3.
ul handling 9.3.1.
Valve clusters of Type 8644 with UL license may be converted by UL-certified production, installation, or service
centers only.
Do not reach into the system. This refers in particular to:
Damage of components, •
Expansion of the valve clusters by modules; the catch mechanism of the pneumatic modules must be released •
for this.
NoTE!
Replacement of the valves is a permitted maintenance operation; follow the general safety instructions.
Typ 8644
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