| 摘要 |
A valve housing of a diaphragm valve has a first valve chamber, into which open a central channel and first and second channels. Valve seats are arranged in the housing, and a first diaphragm is adapted to seal against at least one of the first and second valve seats. A second valve chamber, into which opens a fourth channel, communicates with the central channel through an opening in the housing. A third valve seat is provided and a second diaphragm is adapted to seal the third valve seat.
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