.~ Direct response valves (i.e., check valve type) {14}
516
.~.~ With means for selecting area of valve or seat
DEFINITION
Classification: 137/516
(under subclass 511) Valves provided with means for selecting one of a plurality of diverse effective areas for the valve by selecting from a plurality of preselected valve elements, i.e., from a plurality of valves or from a plurality of valve seats to vary the responsiveness of the valve.
(1) Note. The plurality of elements are usually present in the system at all times.
SEE OR SEARCH THIS CLASS, SUBCLASS:
329+, for devices embodying a plurality of alternate wear parts, one of which may be substituted for another when required by wear or injury.
512+, for means for varying the responsiveness of the
condition response device by selecting one of plural valves of different responsiveness.
529, for selectively usable diverse biasing means for a single condition responsive valve.
