Pressurized liquid delivery apparatus
First Claim
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1. Apparatus for delivering a substantially constant flow of liquid to liquid utilization apparatus, comprising:
- first liquid pumping means and second liquid pumping means; and
control means including an interconnected pair of rotary valves and a switching valve for alternately connecting said first liquid pumping means and said second liquid pumping means to respective supplies of first liquid and second liquid to alternately fill said first liquid pumping means with said first liquid and said second liquid pumping means with said second liquid, for alternately operating said first liquid pumping means to pre-pressurize said first liquid and for operating said second liquid pumping means to pre-pressurize said second liquid and for alternately connecting said first liquid pumping means and said second liquid pumping means to the liquid utilization apparatus to alternately deliver said first pre-pressurized liquid and said second pre-pressurized liquid to the liquid utilization apparatus, and for initially operating said first liquid pumping means to pre-pressurize said first liquid to a pre-selected pressure and for operating said second liquid pumping means to pre-pressurize said second liquid to the pressure at which said first liquid pumping means is actually delivering said pre-pressurized first liquid to the liquid utilization apparatus and for thereafter operating said first liquid pumping means to cause said first liquid pumping means to pre-pressurize said first liquid to the pressure at which said second liquid pumping means is actually delivering said pre-pressurized second liquid to the liquid utilization apparatus.
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Abstract
First liquid pumping apparatus for containing a first quantity of first liquid, second liquid pumping apparatus for containing a second quantity of second liquid and control apparatus for alternately connecting the first liquid pumping apparatus and second liquid pumping apparatus to pressurized liquid utilization apparatus and for causing the first and second liquid pumping apparatus to alternately deliver the respective liquids to the liquid utilization apparatus at a substantially constant flow or substantially constant pressure; the first and second liquids may be the same liquid or different liquids.
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Citations
12 Claims
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1. Apparatus for delivering a substantially constant flow of liquid to liquid utilization apparatus, comprising:
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first liquid pumping means and second liquid pumping means; and control means including an interconnected pair of rotary valves and a switching valve for alternately connecting said first liquid pumping means and said second liquid pumping means to respective supplies of first liquid and second liquid to alternately fill said first liquid pumping means with said first liquid and said second liquid pumping means with said second liquid, for alternately operating said first liquid pumping means to pre-pressurize said first liquid and for operating said second liquid pumping means to pre-pressurize said second liquid and for alternately connecting said first liquid pumping means and said second liquid pumping means to the liquid utilization apparatus to alternately deliver said first pre-pressurized liquid and said second pre-pressurized liquid to the liquid utilization apparatus, and for initially operating said first liquid pumping means to pre-pressurize said first liquid to a pre-selected pressure and for operating said second liquid pumping means to pre-pressurize said second liquid to the pressure at which said first liquid pumping means is actually delivering said pre-pressurized first liquid to the liquid utilization apparatus and for thereafter operating said first liquid pumping means to cause said first liquid pumping means to pre-pressurize said first liquid to the pressure at which said second liquid pumping means is actually delivering said pre-pressurized second liquid to the liquid utilization apparatus. - View Dependent Claims (2, 3)
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4. Apparatus for delivering liquid to liquid utilization apparatus, comprising:
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first liquid delivery means and second liquid delivery means; and control means for; (i) filling said first liquid delivery means with a first quantity of first liquid; (ii) operating said first liquid delivery means to pre-pressurize said first quantity of first liquid to a pre-selected pressure and for connecting said first liquid delivery means to the liquid utilization apparatus to cause said first liquid delivery means to deliver said first quantity of pre-pressurized first liquid to the liquid delivery apparatus; (iii) filling said second liquid delivery means with a second quantity of second liquid while said first delivery means is delivering said first quantity of pre-pressurized first liquid to the liquid utilization apparatus; iv) sensing the actual running pressure at which said first quantity of first pre-pressurized liquid is being delivered to the liquid utilization apparatus by said first liquid delivery means prior to delivery of all of said first pre-pressurized liquid to the liquid utilization apparatus to provide a first sensed pressure; (v) operating said second liquid delivery means to pre-pressurize said second liquid to said first sensed pressure and, prior to the delivery of all of said first quantity of first pre-pressurized liquid to the liquid utilization apparatus by said first liquid delivery means, disconnecting said first liquid delivery means from the liquid utilization apparatus and connecting said second liquid delivery means to the liquid utilization apparatus and to cause said second liquid delivery means to deliver said second quantity of second pre-pressurized liquid to the liquid utilization apparatus; (vi) refilling said first liquid delivery means with a re-filled first quantity of first liquid while said second liquid delivery means is delivering said second quantity of second pre-pressurized liquid to the liquid utilization apparatus; (vii) prior to the delivery of all of said second quantity of second pre-pressurized liquid to the liquid utilization apparatus, sensing the actual running pressure at which said second quantity of second pre-pressurized liquid is being delivered to the liquid utilization apparatus to provide a second sensed pressure; (viii) prior to the delivery of all of said second quantity of second pre-pressurized liquid to the liquid utilization apparatus operating said first liquid delivery means to pre-pressure said re-filled first quantity of first liquid to said second sensed pressure; (ix) prior to delivery of all of said second quantity of second pre-pressurized liquid to the liquid utilization apparatus disconnecting said second liquid delivery means from the liquid utilization apparatus and reconnecting said first liquid delivery means to the liquid utilization apparatus to cause said first liquid delivery means to deliver said first re-filled quantity of first pre-pressurized liquid to the liquid delivery apparatus; and (x) re-filling said second liquid delivery means with a re-filled second quantity of second liquid while said first liquid delivery means is delivering said re-filled quantity of first pre-pressurized liquid to the liquid delivery apparatus. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification