G - Physics – 05 – D
Patent
G - Physics
05
D
137/24
G05D 9/04 (2006.01) E03F 1/00 (2006.01) F16K 31/12 (2006.01)
Patent
CA 1329753
- 25 - ABSTRACT LIQUID LEVEL CONTROL SYSTEM In the field of sewage collection and disposal liquid is commonly transported along a pipe from one place to another by vacuum applied at the pipe's delivery end causing ambient pressure in the tank into which the other and projects to force the liquid into and along the pipe. The outlet from the tank is connected to a vacuum source via a primary, or interface, valve with a control system opening the valve when the tank fills up. With sealed tanks it may be that, when the interface valve to the outlet is suddenly closed at the end of a withdrawal-of-liquid cycle, the rush of liquid and air still entering the tank may result in a sudden increase in the pressure within the tank which mimics the pressure usually experienced by the level sensing apparatus only when the liquid level in the tank reaches the "switch-on" value, with the result that the apparatus triggers the re-opening of the interface valve despite the fact that the valve has only just closed. For this problem the invention proposes a solution which involves a valve control system that includes pressure responsive means comprising: a first chamber containing a first diaphragm having a port for applying pressure; bleed means enabling air to pass this diaphragm; and passageway means enabling air then to pass into a further chamber also containing a diaphragm operatively linked to the valve operating apparatus; so that, when a predetermined and substantially constant pressure is applied at the port, air bleeds past the first diaphragm into the further chamber to move the diaphragm therein to activate the valve control system, but when a surge of pressure is applied at the port the first diaphragm moves to block the passageway into the - 26 - further chamber, thus preventing pressure being applied to the latter's diaphragm to activate the valve control system. Some of the previous transport systems also experience a problem when the vacuum drops, for then the pipe can fill with liquid, the available energy is used up in friction losses, and liquid transport stops - a phenomenon known as "waterlogging", or "bog down". Its chances of occurring can be reduced by ensuring that the interface valve shuts if the vacuum drops significantly, and the invention proposes that this be achieved by incorporating into the control system a secondary valve, itself operated by the same vacuum applied to the tank, so aranged that if the actuating vacuum drops significantly then the secondary valve operates to cause closure of the interface valve and prevent further liquid being drawn into the collecting pipe. The invention suggests a secondary valve of a kind, known per se, in which a "pinching" pressure across the valve's flexible body flexes one or more sealing member inside the body to close the valve, whilst the application of a force perpendicular to the body's surface flexes the or each sealing member to open the valve.
589661
Euro Iseki Limited
Kirby Eades Gale Baker
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