| 摘要 |
<p>A digitally controllable valve (21) has a main valve member (37) mounted on a diaphragm (39) for movement sealing and exposing a main valve seat (35). Pressure in a reservoir above the diaphragm is controlled by two pilot valves (51, 71) respectively connected to the inlet and outlet ports of the main valve, one of which has fluid passageway with a larger minimum cross-sectional area than the other.</p> |
