| 摘要 |
<p>A fail-fixed servovalve includes a jet pipe for discharging a pressurized liquid wherein the jet pipe may be selectively signaled to deflect and unbalance the pressures at opposing ends of a spool which would otherwise remain centered within a sleeve by resilient means at opposing ends thereof. The spool includes a plurality of circumferentially relieved areas interspaced between a plurality of lands with interconnecting passages therebetween wherein a servopiston may be actuated to move by pressurized liquid selectively received from the sleeve and spool such that a sudden loss of either the deflecting signal or the pressurized liquid would operate to block the flow of liquid to the servopiston, locking it in place.</p> |
