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Class Information
Number: 137/563
Name: Fluid handling > Systems > Closed circulating system
Description: Systems including a flow path in which at least a portion of the fluent material is continuously circulated in a closed circuit. Such system may comprise (1) one or more return by-passes in which a portion of the fluent material in a flow line is diverted from and returned to the flow line at a point upstream from the point of diversion, or (2) a system in which the main portion of a flow continuously returns to the starting point, and one or more branches are provided for tapping and removing from the circuit a portion of the fluent material or one or more branches are provided for admitting fluent material from an outside source into the circuit, or (3) all the material circulates in a confined path without addition or removal of material.

Sub-classes under this class:

Class Number Class Name Patents
137/564 With thermal circulating means (thermo-siphons) 17

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8678031 Pipe-passivating alkali-injecting device for a nuclear plant Mar. 25, 2014
8615986 Process for transferring a liquid using a pump Dec. 31, 2013
8528593 Bleed and feed device and method Sep. 10, 2013
8524174 Fluid cartridge, pump and fluid valve arrangement Sep. 3, 2013
8517040 Valve control of pump inlet pressure with bootstrap reservoir Aug. 27, 2013
8496188 Pressure washer device employing a cool bypass Jul. 30, 2013
8491273 Ballast system Jul. 23, 2013
8485222 Systems and methods for preventing oil migration Jul. 16, 2013
8459300 Arrangement for feeding a liquid additive for an internal-combustion engine Jun. 11, 2013
8453665 Self-acting self-circulating fluid system without external pressure source and use in bearing system Jun. 4, 2013
8430122 Fluid tank with contamination containment system Apr. 30, 2013
8408246 Fuel cartridge for fuel cells Apr. 2, 2013
8408233 Flow control system and method for controlling two positive displacement pumps Apr. 2, 2013
8402998 System and method for delivering chemicals Mar. 26, 2013
8371334 Rotary switching valve Feb. 12, 2013
8365768 Fluidic device unit structure Feb. 5, 2013
8333210 Leak isolation logic for closed-volume system Dec. 18, 2012
8316885 Fluid supply system, especially for delivering liquid hydrocarbon to a fuel-operated vehicle heater or to a reformer Nov. 27, 2012
8302626 Plant for recovering a polluting fluid contained in the tanks of a sunken vessel Nov. 6, 2012
8302406 Fuel delivery and control system including a positive displacement actuation pump with a variable pressure regulator supplementing a fixed displacement main fuel pump Nov. 6, 2012
8292194 Process for mixing a liquid or mixture of a liquid and a fine solid present in an essentially self-containing vessel Oct. 23, 2012
8261774 Inlet stratification device Sep. 11, 2012
8262279 Automated recirculation system for large particle size analysis Sep. 11, 2012
8241577 System for storing an additive and injecting it into the exhaust gases of an engine Aug. 14, 2012
8216455 Water handling system Jul. 10, 2012
8201577 Feeding arrangement for a liquid additive for an internal-combustion-engine Jun. 19, 2012
8196602 Water distribution system for cold climates Jun. 12, 2012
8171876 Applicator and method for transferring dispersion liquid May. 8, 2012
8166765 Fuel delivery and control system including a variable displacement actuation pump supplementing a fixed displacement main pump May. 1, 2012
8113236 System and method for delivering chemicals Feb. 14, 2012
8109289 System and method for decentralized balancing of hydronic networks Feb. 7, 2012
7997298 Device for regulation of a concentration for a product in a liquid Aug. 16, 2011
7938874 Driven separator for gas seal panels May. 10, 2011
7934519 Valve unit for a microfluid system May. 3, 2011
7931810 Water purification system and method Apr. 26, 2011
7814933 Apparatus and method for stabilizing concentration of aerosol Oct. 19, 2010
7807119 Bayer process for production of alumina trihydrate, the said improvement relating to separation of aluminate liquor and insoluble residues Oct. 5, 2010
7793684 Water purification system and method Sep. 14, 2010
7793858 Paint delivery and application apparatus and method Sep. 14, 2010
7723700 Controlling the flow of vapors sublimated from solids May. 25, 2010
7661871 Apparatus for storing, mixing, metering, and injecting polymeric slurries into pipelines Feb. 16, 2010
7516755 System for producing and distributing compressed air Apr. 14, 2009
7392818 Slurry dispensing system Jul. 1, 2008
7389792 Dip tube valve assembly Jun. 24, 2008
7338606 Arrangement and method for maintaining a minimum flow velocity in the coolant return of a machine tool coolant filtration system Mar. 4, 2008
7316243 Fluid delivery system Jan. 8, 2008
7308906 Multi-story water distribution system Dec. 18, 2007
7240692 System for producing and distributing compressed air Jul. 10, 2007
7178543 Rapid hot water apparatus and method Feb. 20, 2007
7172689 Arrangement and method for maintaining a minimum flow velocity in the coolant return of a machine tool coolant filtration system Feb. 6, 2007

1 2 3 4 5 6

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