Pressure-reducing valve and a controller for a blow-molding machine and method thereof
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United States of America Patent
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Feb 20, 2007
Grant Date -
Sep 9, 2004
app pub date -
Mar 4, 2003
filing date -
Mar 4, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention is a pressure reducing valve for reducing the pressure supplied to a head tooling hydraulic positioning valve and a controller for bypassing the pressure reducing valve in a blow-molding machine. A pressure-reducing valve and electrical controller are used to regulate the pressure of a cylinder that controls the position of a head tooling pin and die assembly in a blow-molding machine. The invention reduces pressure during all time intervals except during a 'parison formation' interval of the cycle. The invention is also a process for regulating the pressure of a cylinder that controls the position of a head tooling pin and die assembly in a blow-molding machine and for bypassing the pressure reducing valve in a blow-molding machine.
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