Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1990-11-19
1993-09-07
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
141198, 251298, 137630, F16K 3122, F16K 3300
Patent
active
052419835
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an automatic overfill device for the filling of tanks having an incorporated float whereby it is possible to avoid the overflow of liquids when the tanks are being filled.
Overfill devices are known for the filling of tanks having an incorporated float inside the tanks in the extension of the filling orifices, said overfill devices being constituted by a flap valve pivotally mounted on a pin (located outside of the perimeter of the flap) inside a tubular body extending the filling orifice. The valve is connected to a lever arm provided outside the tubular body with a float so as to progressively close the filling pipe as the level of the liquid in contact with the float rises in the tank. When the valve closes the pipe in a fluidtight manner and the gate valve of the filling or supply tank is closed, it is necessary to decompress the filling pipe between the supply tank and the flap valve in order to empty the liquid contained in the pipe. The flap valve is acted upon as by means of complex mechanical devices or the float is acted upon; this type of emptying may cause the tank to overflow if a sufficient allowance has not been provided for, this allowance being difficult to determine in view of the variable lengths of the filling pipes.
Also known for emptying the filling pipes is the provision of a poppet valve which is progressively opened, as the flap valve is progressively closed, by means of an articulated cam. This type of arrangement has at least one drawback; it requires the constant supervision of the filling flow rates so as to determine the lowest rate which signifies that the flap valve has closed the filling orifice so as to make it necessary to close the gate valve of the supply tank. The liquid contained in the pipe is discharged through the orifice opened by the poppet valve; as this detection of the change in the flow rate is very delicate, bearing in mind, the progressive closure of the flap valve and the extent of the flow of the liquid through the orifice opened by the poppet valve, the tank very often overflows.
There is also known from French Certificate of Addition No. 2 299 264 a device which is adaptable on the tank filling pipe and which, when the level of the liquid rises in the tank, acts through a float, connected by flexible wires, on an articulated arm so as to progressively release a principal flap valve so that the latter is positioned for stopping the flow of the filling liquid. This causes the closure of said pipe by the bearing of said flap valve on its seat, the pressure of the liquid contained in the pipe causing the closure of a secondary flap valve connected to the principal valve, the liquid then flowing through a central opening provided in the principal flap valve so that the level of the liquid rises in the tank. This rise in the liquid level causes, through the agency of the float and the connecting wires, the displacement of the articulated arm, which closes the central opening through which the liquid flows, and permits, through a washer provided with an opening, if the supply gate valve is closed at that moment, the flow of the liquid contained in the pipe and also through a leak passage provided on the principal flap valve or on the seat of the latter. If on the other hand the gate valve is not closed, the flow of the liquid through the opening and the leak passage continues to cause the rising of the liquid in the tank until a shoulder fixed on the rod receiving the washer comes to close said opening. This type of device is complex and the emptying of the supply pipe after closure of the gate valve is relatively long.
In U.S. Pat. No. 4,667,711, there is described an overfill device comprising a tubular body in which is disposed a valve seat which is horizontal relative to the vertical axis of the body, and a valve, on one hand pivotally mounted on one of the vertical walls of said body and, on the other hand connected to a float mounted at the end of a flexible and deformable element such as a spring. The tubular body is fu
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Lafon Production S.A.
Walton George L.
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