| 摘要 |
<p>A control valve device for a railway car having an arrangement for changing the axial position of a variable area piston in order to adjust the output pressure of a piston valve assembly in accordance with a high or low speed of the railway car. The axial position of a supply valve seat is set in accordance with a high or low speed signal to in turn set the axial posiiton at which the piston assembly, including the variable area piston, assumes a lap condition.</p> |
