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9. Shutoff valves
Characteristics:
A
Drain valve
Quantity of shutoff possibilities
9.1 General information and operating instructions
IGEMA valves are mostly maintenance-free and allow an easy handling. All
IGEMA valves seal metallically and are hand-operated. Sealing of valve spindle is
made with a gland packing.
Turn handlever/handwheel clockwisely to close the valve.
Turn handlever/handwheel counterclockwisely to open the valve.
Tools to increase the hand torque are not allowed.
The shutoff valve is equipped with self-closing ball (standard).
The self-closing ball is a safety device which automatically closes the valve
passage of the shutoff valves on the process side if level gauge is damaged
accidentally (glass break).
Residuals in piping or fitting (dirt, welding beads etc.) inevitably lead to leakages
(seat/cone).
Fig.1
Ball position during
commissioning or
flushing/purging
Functioning of self-closing ball is only guaranteed if valve is fully
opened. Residuals (dirt, welding beads etc.) can set self-closing ball
out of service.
1
Fig.2
Ball position during
normal operation
20
Serial no.
Fig. 3
Ball position during
glass/mica break or
incorrect commissioning
13
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