Patent ID: 9458944
Filing Date: 2016-10-04
CPC Classification: F15B,F16K,Y10T

Claim Text:
1. A hydraulic safety and movement control system comprising: an actuator including a first chamber, a piston and a second chamber, the first chamber having a first working port configured to be selectively connected to a high-pressure port or a low-pressure port; a hydraulic control arrangement including (i) a first plurality of seat valves connected in parallel and configured to control a first connection between the first working port and the high- pressure port, (ii) and a second plurality of seat valves connected in parallel and configured to control a second connection between the first working port and the low-pressure port so as to continuously move the actuator; and a hydraulic safety arrangement configured to move the actuator, wherein the hydraulic safety arrangement includes including at least one main line connected to connecting the first chamber only to the second chamber actuator, and at least one safety arrangement seat valve arranged in the main line and configured to open and close the at least one main line between the first chamber and the second chamber.