| 摘要 |
<p>A dual circuit fluid pressure control valve for use as a driver's foot operable valve in a compressed air braking system wherein a pressure responsive member (20) carries part (19) of a first double valve and in response to output pressure from the first double valve controls a second double valve in a graduating manner and a pressure responsive member (12) for graduably controlling the first double valve is provided with a discreet pressure responsive area (14) connected to receive the output of the second valve (22) such that the effect on the first valve (15) of change of position of the second pressure responsive member (20) upon loss of the output pressure of the second valve (22) is compensated for.</p> |
