Patent ID: 8870153

Claim:
A pressure actuated valve comprising: a tubular housing; at least one port formed in the tubular housing; a first piston and a second piston, the first and second pistons being independently actuatable relative to one another; a first biasing mechanism positioned proximate the first piston, the first biasing mechanism being adapted to apply a biasing force to the first piston so as to urge the first piston to move towards an initial position, the first piston adapted to be moved from its initial position to an intermediate position by increasing a pressure within the valve from a first pressure to a second pressure, the first piston moving back to its initial position when the pressure within the valve is decreased to a pressure approximately equal to or less than the first pressure; a closing sleeve operatively coupled to the second piston, said sleeve adapted to have an initial position so as to cover the at least one port; a release sleeve coupled to the first piston by a ratchet mechanism and the release sleeve securing the second piston in an initial position; the ratchet mechanism adapted to allow (i) movement of the release sleeve with the first piston between the initial position and the intermediate position of the first piston and (ii) movement of the first piston back to its initial position without the release sleeve, whereby after a number of cycles of movement of the first piston between its initial position and the intermediate position and back, the release sleeve releases the second piston; and a second biasing mechanism positioned proximate the second piston, the biasing mechanism being adapted to apply a biasing force to the second piston so as to urge the second piston to move toward a final position so as to uncover the at least one port.