| 摘要 |
A parallel proportioning valve for use in a dual braking system composed of a casing having a pair of parallel chambers, each of the chambers having a fluid inlet connected to a pressure source and a fluid pressure supply outlet. A fluid pressure responsive plunger is accommodated in each of the chambers with a valve seat provided in a fluid passage between the inlet and outlet. The pressure responsive plunger is adapted to open and close the valve seat. A single spring urges a single plate which abuts at each end of the plungers and urges the plungers in the direction to open the valve seats, a pin is fixed to the abutting plate at the center thereof and has a shoulder formed by an annular notch therearound, and a hole is provided in the casing in the center between the chambers, the hole receiving the pin with a clearance which permits an inclination of the abutting plate which is caused by a normal difference of strokes between the plungers when the plungers are operating properly and which will not permit an inclination of the abutting plate which is caused by a stroke of the operative plunger when the other plunger is inoperative.
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