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DOUBLE-SEAT VALVE (Type 491)
BA 049100.06 EN 29.06.2016
6 Operation/ Use
6.1 Valve Switching Functions
The double-seat valve’s function is characterized through the following described
switching statuses.
6.1.1 Production – Valve Closed
• The various process media flow through the upper and lower piping system
or valve housing.
• Both valve disks are in the final position in the seat area and seal the piping
systems against each other.
• The leakage chamber, which is connected with the free environment, is
formed between both valve disks.
• When there are sealing problems in the seat area, the respective medium
can flow through the leakage chamber and the leakage outlet to the
outside.
05 06
Fig. 4: Valve closed Valve open
6.1.2 CIP or Production Valve Open
• Through the compressed air supply at Pos. 7 (page 12, Fig. 1) the lower valve
disk moves from its final position against the upper valve disk. At the same
time, the seat sealing is maintained. The double-seat valve switches leak-
free.
• The leakage chamber between the now adjacent valve disks is sealed via the
leakage chamber sealing.
The valve disks travel into the opened valve position.
• When the valve is closed, the valve disks now travel against the upper valve
seat.
• The lower disk, maintaining its seat sealing, travels into the final position
and at the same time continually opens the leakage chamber.
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