Maintenance Instructions
Control Valve Series 35 000
KÄMMER VENTILE GMBH • MANDERSCHEIDTSTRASSE 19 • D - 45141 ESSEN • TEL.: ( 0201) 89 19 – 5 • FAX: ( 0201) 89 19 – 600
1.3 QUICK CHECK:
Before operating, check the valve as follows:
1.3.1
Open and close the valve, and observe the
movement of the actuator stem. The
movement must be smooth and linear.
1.3.2
Check for maximum stroke through change
of signal (for pneumatic positioners, 0.2 - 1.0
bar or corresponding split-range values; for
IP positioners, 4-20 or 0-20 mA).
1.3.3
Check all air connections for leaks.
1.3.4
The packing gland nut must always be
tightened slightly more than finger-tight.
IMPORTANT: An excessively tightened
gland nut can cause excessive packing
wear and can hinder the free movement
of the plug stem.
1.3.5 Check fail-safe position. To do this, close
supply pressure and observe whether the
valve opens or closes as prescribed.
1.3.6
After using at fluctuating temperatures, re-
tighten all bolt connections and check for
leaks.
2 MAINTENANCE
Check valves for correct functioning at regular
intervals (at least once every 6 months) as follows.
This check can be made when installed and in many
cases without interrupting production. If internal
defects are suspected, see section on „Disassembly
and Assembly of Valve“.
2.1
Examine gaskets for leaks and if necessary
re-tighten bolts (see Fig. 1).
2.2
Check bellows gasket and test connection
- if present - for external leaks.
2.3
Check valve for damage caused by corrosive
residues or corrosive vapours.
2.4
Clean valves and if necessary re-paint.
2.5
Check packing bolts for correct tightening.
Gland nuts on packing may only be tightened
slightly more than finger-tight, or only tight
enough to ensure a proper seal.
IMPORTANT: An excessively tightened
gland nut can cause excessive packing
wear and can hinder the free movement of
the plug stem.
2.6
If possible, open and close valve and check
for maximum stroke and smooth movement of
the plug stem. Irregular movement of the plug
stem may indicate internal defects.
Note: With graphite packing, irregular move-
ment of the plug stem is normal.
IMPORTANT: Keep hands, hair, clothing,
etc. away from all moving parts. Failure to
do so can lead to serious injury.
2.7
Check all accessories for firm seating.
2.8
If possible, close supply pressure and check
the fail-safe position.
2.10
Check stem boot for wear.
2.11
Check actuator for leaks. To do this, spray
housing, air connections and plug stem guide
with soap suds and note any bubble formation.
2.12
Clean plug stem.
2.13
Check air filter, if present, and if necessary
replace insert.
