| 摘要 |
<p>A control valve (10) comprises a valve assembly (12) having a stepped bore (18) which communicates with a first inlet (30) from a master cylinder, a second inlet (40) from a pump, a first outlet (50) to a wheel brake, and a decay outlet (60) permitting fluid flow away from the first outlet (50) during decay of fluid pressure for anti-lock operation. A first valve element (31) comprises a reduced diameter section (20) extending into an enlarged diameter section (22) which is received within a correspondingly shaped enlarged diameter section (32) of the bore (18). The first valve element (31) includes a longitudinal through passage (35) with a restriction (43) therein, and a transverse fluid passage (37) which intersects the longitudinal through passage (35) and communicates with the enlarged diameter section (22) of the stepped bore (18). One end of the first valve element (31) comprises a valve seat (36) disposed adjacent a second valve element (70) that is operated by an actuator (14). A spring (80) extends between the first valve element (31) and second valve element (70) to bias the second valve element (70) toward a closed position at a valve seat (62) of the decay outlet (60). The first inlet (30) communicates fluid pressure from the master cylinder to the enlarged diameter section (22) of the bore (18) to effect fluid communication with the longitudinal through passage (35) separate from fluid pressure received from the pump and communicated through the second inlet (40) to a separate receiving chamber (44) defined between the enlarged diameter sections (22, 32) of the first valve element (31) and stepped bore (18).</p> |
