| 摘要 |
The circuit comprises first and second power lines (12, 13) connected to a port (A) of a first chamber (16) and to the port (B) of a second chamber (17) of an actuator (10), respectively; a supply line (14) and a discharge line (15) connected to a supply source (P) and to a discharge reservoir (T); a first sliding member valve (120) capable of connecting the first power line (12) to the supply and discharge lines (14, 15) under the control of pilot pressures (p1, p2) transmitted to the sliding member valve (120) by a first pair of pilot lines (18a, 19a); and a second sliding member valve (130) capable of connecting the second power line (13) with the supply and discharge lines (14, 15) under the control of pilot pressures (p1, p2) transmitted to the sliding member valve (130) by a second pair of pilot lines (18b, 19b). The one line (18a) of the first pair of pilot lines (18a, 19a) and the one line (18b) of the second pair of pilot lines (18b, 19b) transmit the same first pilot pressure signal (p1); the other line (19a) of the first pair of pilot lines (18a, 19a) and the other line (19b) of the second pair of pilot lines (18b, 19b) transmit the same second pilot pressure signal (p2), whereby the actuator (10) can be controlled by only two pilot pressures (p1, p2). <IMAGE>
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