Patent ID: 8122906
Filing Date: 2012-02-28
Classification: E21B,Y10T

Abstract:
1. A pressure-driven apparatus, for sequential control of a multiphase operation, said apparatus comprising: a transmission arm comprising a pawl is supported on a cam shaft connected to a pawl cylinder having a built-in return spring or another return load mechanism; and directional control valves, each direction control valve having a spring return and roller capable of being operated by a cam plate of a plurality of cam plates of the cam shaft the cam plates being staggered relative to each other in a predetermined angle to a pawl disk supported in first and second bearings, wherein the pawl cylinder with the built-in return spring, by the pawl disk, will rotate the cam shaft to a set angle in the same rotational direction each time the apparatus is supplied with pressure, and operate each of the directional control valves using the rollers.