Patent ID: 7451755

Claim:
A compressed gas driven gun comprising: a cylinder comprising a piston and a valve pin, wherein the piston is axially slidable within the cylinder and movement of the piston also moves the valve pin; compressed gas at a first pressure that biases the valve pin in a first direction; compressed gas at a second pressure that biases the piston in a second direction, and overcomes a force exerted by the first pressure biasing the piston in the first direction so that the piston moves in sync with the valve pin in the second direction; and a valve that, in response to a signal, decreases the second pressure enough to allow the compressed gas at a first pressure to move the piston in the first direction, which movement of the piston in the first direction results in movement of the valve pin in the first direction, which in turn releases the compressed gas at a first pressure to fire a projectile from the gun; wherein the first direction is a forward direction corresponding to a direction from which the projectile exits the gun, and a rearward direction is a direction substantially opposite that of the forward direction; wherein the cylinder further comprises a valve housing open at one end to receive the compressed gas at the first pressure, said valve housing opening in communication with a passage in the valve housing, said valve housing slidably containing the valve pin, and wherein the valve pin further comprises a seal that prevents the firing of the projectile from the gun by stopping the communication of gas between the valve housing opening and the passage; further comprising a gas governor within the inline cylinder configured to stop the flow of compressed gas at a first pressure through the valve housing opening when the piston is biased to a limit in the first direction.