18 / 34
DOUBLE-SEAT VALVE (Type 491)
BA 049100.06 EN 29.06.2016
6.2 CIP Cleaning
To clean the valve seat it is advantageous to open the double-seat valve at intervals if both
piping systems are located in the CIP cycle
(see also Chapter 10.4, Page 29).
The cleaning of the flushing chambers and the leakage chamber takes place at the same
time (or separately) via a flush pipe. This can be supplied with cleaning fluid directly at the
CIP flow or also separately.
Both flushing chambers are rinsed from below to the top. At the discharge an overflow
pipe drawn downwards is attached (the chamber is thus always filled).
The leakage chamber and the cylindrical valve seat are rinsed by a radially emitted liquid
stream between both valve disks. The liquid flows away through the leakage pipe to the
outside.
The cleaning liquid emitted from the flushing chambers or the leakage chamber is recycled
via a collecting tub or flows into the drains.
6.3 Leakage Detection
It is essential that the form seals in the separate valve disks are protected from
mechanical damage during operation and maintenance.
A leakage in the area of the product and flushing chamber can be recognized as described
below:
• In the case of defective form seals of a valve disk, liquid flows out from the
respective pipe at the leakage outlet in a closed valve position.
• In the case of defective sealing of the leakage chamber, liquid runs out at
the leakage outlet with an opened valve.
• In the case of defective inner sealing of the flushing chambers (lip seals),
liquid flows into the upper or lower flushing chambers. As this is normally
filled with flushing water from the last CIP cleaning, liquid flows away
immediately at the respective CIP outflow.
• In the case of defective exterior sealing of the flushing chambers (quad ring),
liquid flows out at the guide bush’s upper or lower venting bore hole.
To Next Page
Loading...
