# US 9,518,664 B2 · Combination sealing arrangement for rotary ball valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,664 B2 - Document ID: US9518664B2 - Status: Granted - Kind: B2 - Application number: 14/797,211 - Filed: 2015-07-13 - Published: 2016-11-10 - Granted: 2016-12-13 - Earliest claimed: 2015-05-04 - Assignees: Rotex Manufacturers and Engineers Private Limited - Applicants: Rotex Manufacturers and Engineers Private Limited - Inventors: Ajit Kothadia; Amit Shah - Web page: https://patentgrep.com/patent/US9518664B2 ## CPC - F16K 5/0663: {Packings} - F16K 5/0668: {Single packings} - Y10T 137/0508: Ball valve or rotary ball valve - 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 rotary ball valve with an improved sealing arrangement, comprising of a valve body and a rotary ball, the rotary ball valve has a plurality of combination sealing arrangement comprising of a polarized combination cavity having a non-parallel slot and an extended groove, an add-on sealing ring and a compatible seat ring having a plurality of non-parallel concentric surfaces, when assembled. The compatible seat ring has a compatible profile so as to create a positive isolation by a surface contact between the add-on sealing ring and the extended groove and create another positive isolation by a surface contact between the add-on sealing ring and the compatible seat ring. The positive isolation prevents leakage during thermal cycling, pressure variations. The non-parallel slot and the compatible sealing ring therein prevents dislodgement of the seat ring; even in double block and bleed condition. ## Claims ### Claim 1 A method to assemble a combination sealing arrangement in a rotary ball valve comprising of a valve body, a rotary ball, the method comprising the steps of: (i) stretching an add-on sealing ring up to an extended groove of a seat support with a polarized combination cavity; (ii) slipping the add-on sealing ring into the extended groove of the seat support with the polarized combination cavity; (iii) pre-heating a compatible seat ring having a plurality of non-parallel concentric surfaces, when assembled so as to temporarily reduce its intrinsic hardness to 20% to 50%; (iv) fitting the compatible seat ring forcibly into a non-parallel slot the seat support with the polarized combination cavity by applying a force FF on a face of the compatible seat ring; (v) filling of the non-parallel slot of the seat support with the polarized combination cavity by the compatible seat ring; and (vi) machining the face of the compatible seat ring as per a curvature of the rotary ball. ### Claim 2 (depends on 1) The method to assemble the combination sealing arrangement in the rotary ball valve as claimed in claim 1, wherein the slipping of the add-on sealing ring and the fitting of the compatible seat ring includes pressing of the add-on sealing and the compatible seat ring against each other causes deforming elastically the add-on sealing ring. ### Claim 3 (depends on 1) The method to assemble the combination sealing arrangement in the rotary ball valve as claimed in claim 1, wherein the fitting of the compatible seat ring includes providing a compatible profile for creating a positive isolation by a surface contact between the add-on sealing ring and the extended groove of the seat support, and between the add-on sealing ring and the compatible seat ring. ### Claim 4 (depends on 1) The method to assemble the combination sealing arrangement in the rotary ball valve as claimed in claim 1, wherein the fitting of the compatible seat ring into the non-parallel slot includes producing non-parallel concentric surfaces. ### Claim 5 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, wherein the slipping of the add-on sealing ring includes applying a first push force F1 on the extended groove of the seat support and a second push force F2 on the compatible seat ring. ### Claim 6 (depends on 5) The method to assemble the combination sealing arrangement as claimed in claim 5, wherein applying the first push force F1 includes causing a positive isolation due to a surface contact in a groove region between the add-on sealing ring and the extended groove of the seat support. ### Claim 7 (depends on 5) The method to assemble the combination sealing arrangement as claimed in claim 5, wherein applying the second push force F2 includes causing a positive isolation due to a region of contact between the add-on sealing ring and the compatible seat ring. ### Claim 8 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, wherein the fitting of the compatible seat ring with the non-parallel concentric surface includes exerting a third push force F3, an outward force F4 and a fourth push force F5. ### Claim 9 (depends on 8) The method to assemble the combination sealing arrangement as claimed in claim 8, wherein exerting the outward force F4 includes providing a reaction force F4R with a tendency to push the compatible seat ring out of the non-parallel slot. ### Claim 10 (depends on 9) The method to assemble the combination sealing arrangement as claimed in claim 9, wherein providing the reaction force F4R resulting in neutralizing the reaction force F4R due to a non-parallelity of the non-parallel slot. ### Claim 11 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, wherein the fitting of the compatible seat ring into a rotary ball valve comprises fitting into a double block and a bleed condition by momentarily pushing back the compatible seat ring due to a pressure spike; permitting a desired bleed action of a fluid flowing from in-between the face of the compatible seat ring and a face of the rotary ball valve, retaining the compatible seat ring in a selected position in the polarized combination cavity by providing non-parallel concentric surfaces of the compatible seat ring in a non-parallel slot; and providing a positive isolation in a groove region of the seat support and at a region of contact between the add-on sealing ring and the compatible seat ring. ### Claim 12 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the rotary ball valve with a trunnion mounted ball with a positive isolation in the groove region and at a region of contact in an upstream side, breaking a continuity of a leakage path. ### Claim 13 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the rotary ball valve with a floating ball with a positive isolation in a groove region and at a region of contact in a downstream side, breaking a continuity of a leakage path. ### Claim 14 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the extended groove and the add-on sealing ring of such a relative dimension that the add-on sealing ring has a tendency to stay in the extended groove. ### Claim 15 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the add-on sealing ring and the extended groove of such a relative dimension that the acid-on sealing ring slightly projects into the non-parallel slot. ### Claim 16 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the non-parallel slot having an entrance width less than a thickness of the compatible seat ring. ### Claim 17 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the non-parallel slot having a root width more than an entrance width and a thickness of the compatible seat ring. ### Claim 18 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, further including providing the polarized combination cavity having different non-parallel shapes and profiles. ### Claim 19 (depends on 1) The method to assemble the combination sealing arrangement as claimed in claim 1, wherein the slipping of the add-on sealing ring is into a different location of the polarized combination cavity.