Lockable fuel valve
AssigneeJohn O'Keeffe
InventorBrian Francis Mooney
Life of this patent
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Abstract
A lockable valve (7) for a fuel line contains a fuel inlet (2) and fuel outlet (3) which communicates with one another via a passage (6) in which is located a spring-biased piston (15) which is responsive to a pressure change in the fuel line. Associated with the piston (15) is a spring biased plunger (11) which controls a valve (8) to close or restrict the flow of fuel through passage (6). At the other end of the piston (15) is a resetting device (23, 24) which requires an unlocking action before the piston can be extended to withdraw the plunger 11 so as to open the valve. When a fall in pressure is detected by the piston (15), it causes operation of the valve (8) to stop or restrict fuel flow but this operation may only be reversed by the unlocking action.
Claims8
A mechanically lockable valve for a fuel line, said valve comprising:
- a fuel flow closure or restriction valve and a mechanical pressure responsive element including a piston and a plunger mounted in a bore of the piston and movable in response to a pressure change in the fuel line, and
- a locking mechanism associated with the piston and the fuel flow closure or restriction valve, whereby when a particular change of pressure in the fuel line is detected by the mechanical responsive element, operation of the closure or restriction valve and the locking mechanism causes fuel flow to be stopped or be restricted and fuel flow being allowed to resume by an unlocking action of the locking mechanism.
Dependencies are inferred from the claim text.