| 摘要 |
PURPOSE:To supervise the performance of diaphragm valves in the manner informing occurrence of trouble, by fixing an impulse generating means to each housing, and making it possible to compare transmitted impulses with respective programmed unit control signals. CONSTITUTION:Impulse generating means 15a-15c are fixed respectively to diaphragm-valve housings 3d, conduits 4a-4c and compressed-air tanks 2a-2c. Impulsive leakage of compressed air and sound impulses are caused at the opening of diaphragm valves 3a-3c in a time period of 40-100ms under the control of electromagnetic valves 9a-9c, according to a predetermined sequence programmed in electromagnetic valve controlling unit 22. In case that no sound impulse is caused in a selected time period of about 500ms, it is alarmed by a signal from aural indicator 19 or visual indicator 20 or by recorder 21 that some trouble is caused with diaphragm valves 3a-3c.
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