| 摘要 |
PCT No. PCT/EP96/03186 Sec. 371 Date Jun. 19, 1998 Sec. 102(e) Date Jun. 19, 1998 PCT Filed Jul. 19, 1996 PCT Pub. No. WO97/05415 PCT Pub. Date Feb. 13, 1997A bleeder valve comprising a housing including a sensor device of material which is optically denser than gas arranged between a light transmitter and a photo-electric receiver, at least one external surface of the sensor device being disposed in a space to which gas or hydraulic fluid is admitted; when gas is in contact with the external surface, light reaches the receiver and when hydraulic fluid is in contact with the surface, light does not reach the receiver, an output signal is generated by the receiver which causes a magnetic valve to open until gas is exhausted.
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