Valve arrangement

Claim 1

IN A SERVO-CONTROL VALVE THE IMPROVEMENT COMPRISING, IN COMBINATION: A VALVE BODY; A STEM MEANS MOUNTED FOR RECIPROCAL MOTION IN SAID VALVE BODY AND HAVING A SEAL PORTION AND AN ACTUATOR END PORTION, AND SAID STEM MEANS ADAPTED TO MOVE RECIPROCALLY ALONG A LONGITUDINAL AXIS THEREOF; A SPOOL MEANS MOUNTED FOR RECIPROCAL MOTION IN SAID VALVE BODY ADJACENT SAID SEAL PORTION OF SAID STEM MEANS AND HAVING AN UPPER SURFACE AND A LOWER SURFACE, AND HAVING FIRST WALL DEFINING AN APERTURE THEREIN, AND SAID SEAL PORTION OF SAID STEM MEANS ADAPTED TO BE SEPARATED FROM PREDETERMINED PORTIONS OF SAID FIRST WALLS IN SAID UPPER SURFACE OF SAID SPOOL MEANS BY A FIRST PRESELECTED DISTANCE, SAID SPOOL MEANS ADAPTED TO MOVE RECIPORCATINGLY IN PATHS COLINEAR WITH SAID STEM MEANS FOR MAINTAINING SAID PRESELECTED DISTANCE, AND SAID SPOOL MEANS HAVING SECOND WALLS ON SAID LOWER SURFACE THEREOF DEFINING A CHAMBER; A POPPET MEANS MOUNTED FOR RECIPROCAL MOTION IN PATHS COLINEAR WITH SAID SPOOL MEANS AND HAVING AN UPPER SURFACE AND A LOWER SURFACE, AND SAID UPPER SURFACE ADAPTED TO SEALINGLY ENGAGE SAID SECOND WALLS OF SAID LOWER SURFACE OF SAID SPOOL MEANS IN A NEUTRAL AND A SECOND POSITION TO SEAL SAID CHAMBER, AND TO BE SEPARATED THEREFROM IN A FIRST POSITION, AND SAID POPPET MEANS HAVING FIRST WALLS DEFINING A PASSAGEWAY THEREIN FOR FLUID COMMUNICATION BETWEEN SAID UPPER SURFACE AND SAID LOWER SURFACE AND SAID POPPET HAVING WALLS DEFINING A PERIPHERAL VOLUME THEREON SEALED FROM SAID PASSAGEWAY IN SAID NEUTRAL POSITION AND SAID FIRST POSITION; AND SAID SPOOL MEANS HAVING WALLS DEFINING A BLEED ORIFICE THEREIN PROVIDING COMMUNICATION BETWEEN SAID CHAMBER AND SAID UPPER SURFACE OF SAID SPOOL MEANS; A FIRST PORT IN SAID VALVE BODY COMMUNICATING WITH SAID APERTURE IN SAID SPOOL MEANS; A SECOND PORT IN SAID VALVE BODY COMMUNICATING WITH SAID PASSAGEWAY IN SAID POPPET MEANS AND WITH SAID CHAMBER; A THIRD PORT IN SAID VALVE BODY COMMUNICATING WITH SAID PERIPHERAL VOLUME OF SAID POPPET MEANS; AND SAID FIRST PORT IN COMMUNICATION WITH SAID SECOND PORT IN SAID FIRST POSITION THROUGH SAID PASSAGEWAY AND SAID CHAMBER, SAID THIRD PORT IN COMMUNICATION WITH SAID SECOND PORT IN SAID SECOND POSITION, AND SAID FIRST PORT IN COMMUNICATION WITH SAID THIRD PORT THROUGH SAID APERTURE AND SAID BLEED ORIFICE IN SAID SPOOL MEANS AND SAID PASSAGEWAY IN SAID POPPET MEANS.