Device for detecting leak in metering cylinder of liquid filling machine
US5040579A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1990 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Aug 31, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F11/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a liquid filling machine having a metering cylinder, a piston accommodated in the cylinder with a clearance formed therebetween, and a membrane closing each open end of the clearance to form a closed space, a device for detecting a leak in the metering cylinder comprising a vacuum pipe connected to the metering cylinder in communication with the closed space, an orifice plate inserted in the vacuum pipe for maintaining the interior portion of the pipe upstream from the orifice plate at a pressure lower than a predetermined value when the membrane has no leak with a standard quantity of leakage fluid flowing through the pipe and maintaining the interior portion at a pressure not lower than the predetermined value when the membrane has a leak, and a pressure sensor for detecting the pressure of the upstream interior portion of the pipe and producing a leak detection signal when the detected pressure is not lower than the predetermined pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.