Burkert Type 8644 - Manual (Page 62)

62
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.
9.3. maintenance of components
9.3.1. ul handling
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.
english
Type 8644