The present invention relates to systems for circulating water in a potable water piping network to prevent the stagnation of water in this piping network. Several systems are disclosed wherein partitioned pipes, pumps, partitioned headers, check valves, and scoop inserts are used to keep the water
The present invention relates to systems for circulating water in a potable water piping network to prevent the stagnation of water in this piping network. Several systems are disclosed wherein partitioned pipes, pumps, partitioned headers, check valves, and scoop inserts are used to keep the water in movement inside the pipes. The present invention comprises several pumping arrangements for circulating water inside fire hydrant laterals and inside the branch pipes along dead-end streets where most of the water stagnation occurs. Although partitioned pipes are used and opposite flows are induced in opposite pipe halves, full pipe flow to each hydrant is maintainable in case of emergency. Inside buildings, the water is kept in movement inside a loop pipe that extends close to each water outlet such that the water is maintained fresh at each outlet.
대표청구항▼
The present invention relates to systems for circulating water in a potable water piping network to prevent the stagnation of water in this piping network. Several systems are disclosed wherein partitioned pipes, pumps, partitioned headers, check valves, and scoop inserts are used to keep the water
The present invention relates to systems for circulating water in a potable water piping network to prevent the stagnation of water in this piping network. Several systems are disclosed wherein partitioned pipes, pumps, partitioned headers, check valves, and scoop inserts are used to keep the water in movement inside the pipes. The present invention comprises several pumping arrangements for circulating water inside fire hydrant laterals and inside the branch pipes along dead-end streets where most of the water stagnation occurs. Although partitioned pipes are used and opposite flows are induced in opposite pipe halves, full pipe flow to each hydrant is maintainable in case of emergency. Inside buildings, the water is kept in movement inside a loop pipe that extends close to each water outlet such that the water is maintained fresh at each outlet. ake air fed to said internal combustion engine; a fuel injection valve for charging the fuel into the cylinder of said internal combustion engine; a spark plug provided in association with each of said plural cylinders of said internal combustion engine for igniting the air-fuel mixture charged into said cylinder; various types of sensors for detecting operating state of said internal combustion engine; and a control unit for controlling said fuel injection valve and said spark plug in dependence on the operating state of said internal combustion engine upon starting of operation of said internal combustion engine, said control unit comprising: combustion stroke discriminating means for discriminatively identifying combustion strokes taking place sequentially among said plural cylinders, wherein the fuel injection quantity supplied to the individual cylinders of said internal combustion engine and the ignition timing for burning the charged fuel are set variably for said individual combustion strokes, respectively, upon starting of operation of said internal combustion engine. 2. A starting control apparatus for an internal combustion engine according to claim 1, wherein said control unit includes: a counter for counting the number of the combustion strokes taking place sequentially among said plurality of cylinders from a time point at which cranking is started upon starting of operation of said internal combustion engine, wherein said fuel injection quantity and said ignition timing for each of said cylinders are set on the basis of said number of said combustion strokes. 3. A starting control apparatus for an internal combustion engine according to claim 2, wherein said control unit includes: a storage for storing control quantity map data bearing correspondency to said fuel injection quantity and said ignition timing, respectively, with said number of said combustion strokes being used as parameter with a view to setting said fuel injection quantity and said ignition timing by looking up said control quantity map data, and wherein the map data value for said fuel injection quantity is set variably so that said control quantity increases or alternatively decreases in dependence on increase of the number of said combustion strokes. 4. A starting control apparatus for an internal combustion engine according to claim 1, said various types of sensors including a water temperature sensor for detecting cooling water temperature of said internal combustion engine, wherein said control unit is so designed as to set said fuel injection quantity and said ignition timing on the basis of said cooling water temperature. 5. A starting control apparatus for an internal combustion engine according to claim 1, said various types of sensors including a rotation sensor for detecting a rotation number (rpm) of said internal combustion engine, wherein said control unit is so designed as to set a correcting quantity for said ignition timing in dependence on the rotation number of said internal combustion engine. 6. A starting control apparatus for an internal combustion engine according to claim 5, said control unit including a storage for storing correcting quantity map data bearing correspondency to the control quantity for said ignition timing as a function of change of rotation number of said internal combustion engine, wherein said control unit is so designed as to set a correcting quantity for said ignition timing by looking up said correcting quantity map data to thereby set finally the ignition timing determined by adding or subtracting said correcting quantity to or from a reference value of said ignition timing. grooves. The first exterior groove receives a compliant seal, and the second exterior groove is located between the first groove and the outlet. The fuel injector cup includes an end that defines an aperture through which passes along an axis the inlet of the fuel injector. The fuel injector cup also includes inner and outer surfaces. The inner surface contiguously engages the compliant seal, and the outer surface includes a shoulder that faces generally opposite the end of the fuel injector cup. The fastener includes first and second portions. The first portion engages the second exterior groove on the body of the fuel injector, and the second portion engages the shoulder on the outer surface of the fuel injector cup so as to axially retain the fuel injector relative to the fuel injector cup. The first portion is axially spaced from the second portion such that a first axial measurement between the first portion of the fastener and the compliant seal exceeds a second axial measurement between the end of the fuel injector cup and the shoulder on the outer surface of the fuel injector cup. Details of the fastener and a method for using the mounting arrangement are also included.
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