F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
137/44, 110/69
F23N 3/00 (2006.01) F23N 3/02 (2006.01) F24F 11/047 (2006.01) G05D 7/03 (2006.01)
Patent
CA 1172518
ABSTRACT A method and devices for applying the generally known principle of cascade flow in control of self-adjusting fluid handling systems, which devices are capable of maintaining predetermined flow rate/pressure difference ratios, over a wide range of variations. The capability of maintaining predetermined flow rate/ pressure difference ratios is based on a capability of maintaining predetermined displacement/Pressure difference ratios of axially displaceable means of control in application of the principle of cascade flow. One embodiment is a draught control device, which is capable of maintaining substantially constant draught, e.g. in central heating boilers of solid fuel, over a wide range of variations in flue pressure. Another embodiment is a constant flow valve, capable of maintaining constant rate of volume flows in house ventilation. A third embodiment of the present invention is a constant pressure valve, capable of maintaining constant pressure of fluid upstream the valve.
414501
Niskanen Erkki J.
Swabey Ogilvy Renault
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