Fluid handling – Control by change of position or inertia of system – With second control
Patent
1991-04-25
1992-05-26
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
With second control
137 43, 137202, 137498, F16K 1736
Patent
active
051158302
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a valve device comprising a valve housing with an inlet and an outlet, a valve seat and a valve closing member movable in said housing between open and closed positions and having a sealing surface, which in the closed positions of the valve closing member is in contact with the valve seat to prevent liquid from flowing through the outlet, said valve closing member interacting with said means which at a certain tilting of the valve housing, relative to a predetermined position, move the valve closing member to its closed position.
A valve of this type is used, for example, as a so-called "roll-over" valve in the vent pipe between a vehicle fuel tank and a filter with activated charcoal, which is designed to absorb gasoline fumes from the tank. The valve is designed to prevent liquid gasoline from reaching the filter should the inclination of the vehicle exceed 30.degree., for example, since liquid gasoline impairs the capacity of the charcoal to absorb gasoline fumes.
When filling the tank, some of the venting normally takes place via the gap between the gasoline pump nozzle and the tank fill pipe. If this gap is closed for the purpose of entirely preventing gasoline fumes from leaking out into the surrounding air, the entire volume of gas which is pressed out of the tank when it is filled with fuel must pass through the activated charcoal filter. Normally, when the tank is completely filled, the pump nozzle automatically shuts off the supply of fuel and prevent overfilling, but it is important that this automatic shut-off be effected quickly so that fuel does not rise in the vent pipe and reach the filter. If there is a seal between the nozzle spout and the tank fill pipe, then some form of safety device is required to protect against fuel penetrating to the filter. This protection can be in the form of a float operated valve in series with the "roll-over" valve.
The purpose of the present invention is to combine the function of the "roll-over" valve and the float operated valve in a single, simple and reliable valve.
This is achieved according to the invention in a valve device of the type described by way of introduction by virtue of the fact that the valve closing member is fixed to a float, which, as the liquid level rises in the housing in its predetermined position, lifts the valve closing member towards its closed position, and the weight of said means is adapted to the lifting force of the float, so that the valve body, when the housing is filled with liquid and has been turned 180.degree. from the predetermined position, is held in its closed position.
If a float operated valve is turned upside down, the float will function in a way which is just the opposite to what was intended, i.e. with the float housing filled with liquid, the float will strive to keep the valve closing member from the valve seat. This means that if a car should turn over and come to rest upside down, the float would normally keep the valve open and allow gasoline to flow out through the vent pipe, but by adapting the components of the valve to each other in the manner stated above, the "roll-over" function will always predominate if the car should roll over.
When filling the tank with fuel, a mixture of air and fumes flows out from the tank via the vent pipe. As soon as the tank is full, fuel rises in the vent pipe. If the filling is done relatively slowly, the float follows the rising of the liquid level in the valve housing and the valve closes without any liquid having forces its way through the valve outlet. If, however, the tank is filled rapidly, there is a "pressure surge" in the fuel, when the tank has been filled, and the float cannot close the valve quickly enough to prevent a certain amount of fuel from passing through the valve and reaching the filter.
In order to make sure also that the valve closes when there is such a fuel pressure surge, according to a further development of the valve according to the invention, the valve closing member is coordinated with a movably mounted p
REFERENCES:
patent: 2603230 (1952-07-01), Krieger
patent: 3765435 (1973-10-01), Schlanzky
patent: 3916928 (1975-11-01), Enoch
patent: 3970098 (1976-07-01), Boswank et al.
patent: 3996951 (1976-12-01), Parr et al.
patent: 4679581 (1987-07-01), Mears
AB Volvo
Nilson Robert G.
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