Fluid flow control device

Claim 1

A VALVE STRUCTURE COMPRISING: A TUBULAR MAIN VALVE BODY BAND, A SLEEVE-LIKE CORE HAVING TWO AXIALLY SPACED ANNULAR SERIES OF THROUGH SLOTS AROUND IT MOUNTED IN RADIALLY SPACED RELATIONSHIP WITHIN SAID MAIN BODY BAND, A BARRIER ACROSS SAID CORE BETWEEN SAID SPACED SERIES OF SLOTS BLOCKING DIRECT FLOW THROUGH SAID CORE, AN EXPANSIBLE SLEEVE ON SAID CORE, AN INLET CONNECTOR PLATE HAVING AN INLET PASSAGE THERETHROUGH, MEANS ON SAID INLET CONNECTOR PLATE FOR ATTACHING IT TO A PIPE SECTION, AN OUTLET CONNECTOR PLATE, MEANS FORMING AN OUTLET FLOW PASSAGE OF SELECTED INTERNAL DIAMETER THROUGH SAID OUTLET CONNECTOR PLATE MEANS ON SAID OUTLET CONNECTOR PLATE FOR CONNECTING IT TO A PIPE SECTION OF SELECTED DIAMETER, A PLURALITY OF THREADED MEMBERS AROUND SAID CONNECTOR PLATES FOR FORCING THEM INTO CLAMPING ENGAGEMENT WITH SAID VALVE BODY BAND, MEANS ON SAID BODY BAND SPACING SAID EXPANSIBLE SLEEVE FROM SAID CONNECTOR PLATES, AND RESILIENT SEAL RINGS BETWEEN SAID CONNECTOR PLATES AND THE ENDS OF SAID VALVE BODY BAND.