ARMATUREN
totraumfrei & wartungslos
11
Control valves
are used for the adjustment and the relocation
of a certain process factor (mass flow, pressure, temperature).
With
sampling valves
and sample systems representative
samples are taken during the ongoing process out of chemi-
cal, petrochemical and pharmaceutical systems in order to
monitor and control the media quality.
A
sight glass
with optical transparent glass can be used
for observing process flow. A strainer protects dirt sensitive
installations as measurement devices or pumps from line im-
purities
7. Maintenance instructions
Under normal conditions and in the case of the use according
to the regulations, frequent maintenance work on AZ valves is
not necessary. After an extended period of operation, AZ recom-
mends checking the function of the valve by repeated open-close
strokes. Tightness of the valve/pipe connection and valve cover
area may also be visually checked for leakage. The functionality
of valves which remain constantly in the same position should be
checked frequently, e. g. by performing a “partial-stroke-test”.
After a certain operating time, leakage can occur due to wear-
ing of the sealing parts, small leakages (depending on type of
sealing) can be stopped by tightness adjustment (please refer to
pages 7 + 8).
After finishing maintenance or repair work please check the
proper function of the valve (particularly the closing position of
actuated valves) and the tightness of the connection between
valve and piping.
