(under the class definition) Subject matter wherein the valve actuator comprises an annular member which is mounted around and guided by a pipe which forms a flow passage leading to or from the valve.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4+, for tube compressors which include means surrounding the pipe to control the flow by deformation of the pipe.
SEE OR SEARCH CLASS
222, Dispensing,
507, for an annular, outlet surrounding actuator for a dispenser outlet element.
