Positioner

Claim 1

IN A POSITIONER FOR A MOVABLE MEMBER, THE COMBINATION COMPRISING FLUID OPERATED ACTUATOR MEANS FOR MOVING SAID MEMBER, AND MEANS CONTROLLING FLOW OF FLUID WITH RESPECT TO SAID ACTUATOR MEANS AND INCLUDING A BODY ELEMENT PROVIDED WITH A PLURALITY OF GAGE POINT PORTS, A SLIDE ELEMENT OPERATIVELY ASSOCIATED WITH SAID BODY ELEMENT, SAID ELEMENTS BEING ARRANGED TO HAVE RELATIVE ROTATIVE MOVEMENT IN A CIRCULAR DIRECTION AND RELATIVE SLIDING MOVEMENT IN A TRANSVERSE DIRECTION, SAID SLIDE ELEMENT HAVING A VALVING LAND EXTENDING ARCUATELY IN SAID CIRCULAR DIRCTION AND BOUNDED BY AND EDGE VARYING POSITIONALLY IN SAID TRANSVERSE DIRECTION ALONG THE EFFECTIVE ARCUATE EXTENT OF SAID LAND, SAID VALVING LAND BEING ADAPTED TO TRANSVERSE ANY ONE OF SAID PORTS, SELECTOR VALVE MEANS OPERATIVELY ASSOCIATED WITH SAID BODY ELEMENT AND SELECTIVELY OPERABLE TO PLACE ANY AND AT LEAST ONE OF SAID PORTS IN FIELD CONDUCTING COMMUNICATION WITH SAID ACTUATOR MEANS, SAID BODY AND SLIDE ELEMENTS MOVING IN SAID TRANSVERSE DIRECTION RELATIVE TO EACH OTHER IN RESPONSE TO MOVEMENT OF SAID MEMBER, AND MEANS SELECTIVELY OPERABLE TO PRODUCE THE DESIRED RELATIVE MOVEMENT IN SAID CIRCULAR DIRECTION BETWEEN SAID BODY AND SLIDE ELEMENTS.