| 摘要 |
<p>A method of controlling a valve (206) includes detecting a supply pressure at a fluid source (202) and detecting a first port (208) pressure at a first side of a piston (214). A controller (224) actuates the valve from a closed position to a first open position when the supply pressure is in excess of the first port pressure. Thereafter, the controller actuates the valve to the closed position when the supply pressure is less than the first port pressure.</p> |
