| 摘要 |
<p>The pilot air operated air valve includes a valve body with a pressurised air supply chamber and an axially movable valve spool operatively mounted, which is moved in one direction by a return spring and in the other direction by pressurised pilot air controlled by a pilot valve. An accumulator chamber is formed in the valve body and it is connected by passageway to a supply source of pilot air and to the pilot valve for supplying pilot air to the pilot valve. The accumulator chamber is connected by a passageway, which is not connected to the air supply chamber, to an air return chamber communicating with the valve spool. This allows pilot air to be admitted from the accumulator chamber to the air return chamber to assist the return spring in its valve spool return action.</p> |
