| 摘要 |
<p>In a control valve assembly for an hydraulic braking system a brake housing has first, second, and third ports adapted to be respectively connected to a source of hydraulic fluid under pressure, to a brake actuator, and to a reservoir, a pedal-operated piston working in a bore in the housing acts through a spring on a second piston through which there is a passage providing communication between the second and third ports, and said passage is controlled by a normally open exhaust valve member which, on axial movement of the second piston closes and acts through a resilient connection to open a normally closed inlet valve member controlling communication between the first and second ports.</p> |
