| 摘要 |
In the first-depicted embodiment, the valve is of the ported, plate-type, having a ported valve seat, stop plate, a buffer plate, and a pair of valving elements. Stop pins extending from the stop plate restrict the lift of one of the ported valving elements to a lift dimension in which the flow coefficient provided thereby diminishes at a linear rate. The other ported valving element, carried by the first to the restricted limit of travel thereof, is free to continue its lift, in a valving function then, through a like valving lift dimension in which the flow coefficient which it affords also diminishes at a linear rate. Springs, interposed between the just-mentioned other valving element, and the stop plate, bias the valving elements in closure of the ports in the valve seat. The buffer plate, however, is supported in a non-contacting, speed-apart disposition relative to the seat, the stop, and the valving elements, and in a loose, independent, and unrestrained disposition relative to the stop and, therefore, is freely engageable with the stop.
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