GAS MIXING PUMP WITH VARIABLE INJECTION SECTION
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United States of America Patent
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Issued Date -
Jul 8, 2010
app pub date -
May 20, 2008
filing date -
May 25, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a pump including: a gas mixing housing (1); ducts (2, 3) for supplying the housing (1) with HP and IP gases and giving into the mixing housing (1); an outlet duct (3) for the mixed gases; a pneumatic actuator (10) provided in the HP-gas supply duct (2) including a mobile piston connected to a stopper (12) whose position in the duct (2) determines a passage section of the HP gas towards the mixing housing (1); a control chamber (13) of the mobile piston adapted to be fed under pressure for determining the position of the mobile piston; a pneumatic circuit provided between a pressure source and the control chamber (13); characterised in that the pneumatic circuit includes at least one leak valve (22) adapted for generating a leak in the pneumatic circuit for modifying the pressure supplied to the control chamber (13).
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