| 摘要 |
<p>A solenoid controlled, pilot operated valve which is provided with a pilot air accumulator chamber in the pilot air supply to insure soundness of operation of the pilot air supply, and make the shifting characteristics of the valve relatively constnat and positive. The main spool valve is shifted in one direction by pilot air and shifted in the other direction by either a return spring alone, or a return spring with an air assist. The accumulator chamber may be supplied with pilot air from an external source of pressurized air, or from an internal source within the valve. If an internal source of pilot air is employed, then a check valve is operatively mounted in an air passage between the valve supply chamber and the accumulator chamber to allow free flow into the accumulator chamber and restrict any air bleeding back to the valve supply chamber.</p> |
