# US 8,783,657 B2 · Top entry plastic ball valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,657 B2 - Document ID: US8783657B2 - Status: Granted - Kind: B2 - Application number: 13/320,382 - Filed: 2009-08-21 - Published: 2012-04-05 - Granted: 2014-07-22 - Earliest claimed: 2009-06-23 - Assignees: Guangdong Liansu Technology Industrial Co., Ltd. - Applicants: Jiyue Yang; Hongbin Huang - Inventors: Jiyue Yang; Hongbin Huang - Web page: https://patentgrep.com/patent/US8783657B2 ## CPC - F16L 47/02: Welded joints; Adhesive joints - F16K 5/0636: {the spherical plug being insertable from the top of the housing} - Y10T 137/6038: Particular valve seat or interface seal - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A top entry plastic ball valve comprises a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9). A hollow valve ball chamber (911) is provided inside the valve body (9), the valve body (9) is provided with a valve cover hole (912) just above the valve ball chamber (911), and the width of the valve cover hole (912) is larger than the diameter of the valve ball (7). The ball valve also comprises a valve cover (4), which is provided with a valve stem shaft hole (410) for allowing the valve stem (2) to pass through and corresponds to the valve cover hole (912) so that the valve cover (4) can cover the valve cover hole (912) and can be fusion-bonded to the valve body (9), thereby avoiding the need for electric fusion welding process in the manufacture of large-diameter ball valves. ## Claims ### Claim 1 A top entry plastic ball valve comprising a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9), wherein a hollow valve ball chamber (911) is provided inside the valve body (9), characterized in that the valve body (9) is provided with a valve cover hole (912) just above the valve ball chamber (911), the width of the valve cover hole (912) is larger than the diameter of the valve ball (7), the ball valve also comprises a valve cover (4) which is provided with a valve stem shaft hole (410) for allowing the valve stem (2) to pass through and corresponds to the valve cover hole (912) so that the valve cover (4) can cover the valve cover hole (912) and can be fusion-bonded to the valve body (9); the right end and the left end of the valve body (9) are respectively provided with a connecting pipe seat, the side of said each connecting pipe seat fusion-welded with the connecting pipe (8) is provided with an outer end surface ring (910) which is perpendicular to the axial line of the valve body (9), and the valve body (9) and the connecting pipe (8) are in end surface welding through the outer end surface rings (910) by hot melt; two sides of the valve ball chamber (911) of the valve body (9) are respectively provided with a positioning end surface for the mounting ring for the valve ball sealing ring and a positioning end surface for the supporting ring for the valve ball sealing ring; the valve ball chamber (911) is an inner cylindrical surface coaxial with the valve body (9) and has an indentation at the valve cover hole (912), the valve cover (4) is provided with an inner cylindrical surface (41) of the valve ball chamber for supplementing the indentation, the valve body (9) is further provided with an inner cylindrical surface (92) fitted with the outer cylindrical surface of the valve ball sealing ring (5), the inner cylindrical surface (92) is in the shape of a circular ring concentric with the valve body (9), the inner cylindrical surface (92) has an indentation on the valve body (9), and the valve cover (4) is provided with an inner cylindrical surface (42) of the valve ball sealing ring for supplementing the indentation. ### Claim 2 (depends on 1) The top entry plastic ball valve according to claim 1, characterized in that the valve cover hole (912) is in the shape of a square, or a rectangle, or a circle, or an ellipse and parallel to the axial line of the valve body (9). ### Claim 3 (depends on 1) The top entry plastic ball valve according to claim 1, characterized in that an annular plane is provided around the valve cover hole (912) to be taken as a valve cover melt adhesive surface (91) which is parallel to the axial line of the valve body (9), and the valve body (9) and the valve cover (4) are in end surface welding through the melt adhesive surface (91) by hot melt. ### Claim 4 (depends on 1) The top entry plastic ball valve according to claim 1, characterized in that a conical plane is provided around the valve cover hole (912) to be taken as a valve cover melt adhesive surface (91) which is perpendicular to the axial line of the valve body (9), and the valve body (9) and the valve cover (4) are in end surface welding through the melt adhesive surface (91) by hot melt. ### Claim 5 (depends on 1) The top entry plastic ball valve according to claim 1, characterized in that the connecting pipe (8) is provided with a fusion welding surface (81) used for being welded with the valve body (9) by hot melt, and the fusion welding surface (81) is of an annular end surface or a conical surface and corresponds to the outer end surface ring (910) which is an annular plane or a conical surface. ### Claim 6 (depends on 1) The top entry plastic ball valve according to claim 1, characterized in that the main body of the valve cover (4) is a planar ring (47), the planar ring (47) has the same size and shape with the valve cover hole (912), a perpendicular cylindrical ring is provided just above the planar ring (47), the cylindrical ring is provided with the valve stem shaft hole (410), the inner wall of the cylindrical ring is provided with an inner groove (44) for mounting the valve stem sealing ring (3) and an annular groove (45) buckled with a buckling part on the valve stem (2), the outer wall of the cylindrical ring is provided with an annular protrusion (49) fitted with an annular groove of the inner hole on the valve stem cap (1).