| 摘要 |
<p>A GATE VALVE INCLUDES A GATE (12) AND A DRIVE TRAIN. THE DRIVE TRAIN INCLUDES A GATE ROD (20) FOR LINEARLY MOVING THE GATE, A TRANSLATOR OPERATIVELY COUPLED TO THE GATE ROD (20) FOR MOVING THE GATE ROD (20) LINEARLY IN RESPONSE TO ROTATIONAL MOTION, AND A COUPLING DEVICE (60) CONNECTED TO THE TRANSLATOR FOR PROVIDING ROTATIONAL MOTION. THE GATE VALVE ALSO INCLUDES A FLUID CYLINDER (24) COOPERATIVELY COUPLED TO THE DRIVE TRAIN FOR PROVIDING AN ASSISTING FORCE TO MOVE THE GATE ROD (20) LINEARLY AND A ROTARY VALVE (77) COOPERATIVELY CONNECTED TO THE COUPLING DEVICE (60) AND IN A FLUID FLOW PATH BETWEEN THE CYLINDER AND A FLUID PRESSURE SOURCE. TORQUE APPLIED TO THE COUPLING DEVICE (60) MOVES THE ROTARY VALVE (77) TO AN OPEN POSITION TO SUPPLY FLUID PRESSURE TO THE FLUID CYLINDER (24). THE MOST ILLUSTRATIVE DRAWING IS</p> |
