# US 8,770,225 B2 · End cover and four-way reversing valve using the same and assembling method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,225 B2 - Document ID: US8770225B2 - Status: Granted - Kind: B2 - Application number: 12/839,561 - Filed: 2010-07-20 - Published: 2011-01-27 - Granted: 2014-07-08 - Earliest claimed: 2009-07-24 - Assignees: Zhejiang Sanhua Climate and Appliance Controls Group Co., Ltd - Applicants: Guodong Zhang; Songyan Huang - Inventors: Guodong Zhang; Songyan Huang - Web page: https://patentgrep.com/patent/US8770225B2 ## CPC - F16K 11/0655: {with flat slides} - B65H 31/26: Auxiliary devices for retaining articles in the pile - F16K 27/048: {Electromagnetically actuated valves} - F25B 41/26: of fluid flow reversing valves - Y10T 29/49425: including metallurgical bonding - Y10T 137/6851: With casing, support, protector or static constructional installations - Y10T 137/86839: Four port reversing valves - 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)} - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to a four-way reversing valve for refrigerating cycle system, in particular to an end cover for fitting with a valve body of a main valve of a four-way reversing valve, a four-way reversing valve using the same and an assembling method thereof. The end cover has a larger diameter section and a smaller diameter section sequentially provided in an axial direction, wherein an outer periphery of the larger diameter section of the end cover is adapted to be tightly connected with the valve body, and an end portion of the smaller diameter section of the end cover is adapted to be fitted with a piston of the main valve, so as to define an operating position of the piston, characterized in that the larger diameter section of the end cover has a frustum shape with a larger outer end and smaller inner end, or an end portion of the larger diameter section of the end cover has radially projected flange for abutting against and fitting with an end surface of the valve body. The present invention may meet the requirement for the position precision between the valve body and the end cover and improve the welding precision therebetween. ## Claims ### Claim 1 An end cover for fitting with a valve body of a main valve of a four-way reversing valve, the end cover comprising a larger diameter section and a smaller diameter section sequentially provided in an axial direction, wherein an outer periphery of the larger diameter section of the end cover is adapted to be tightly connected with an end portion of the valve body, and an end portion of the smaller diameter section of the end cover is adapted to be fitted with a piston of the main valve so as to define an operating position of the piston, and the larger diameter section of the end cover has a frustum shape with a larger outer end and smaller inner end, wherein the larger outer end of the larger diameter section of the end cover has a radial dimension greater than an inner diameter of the end portion of the valve body, and the smaller inner end of the larger diameter section of the end cover has a radial dimension smaller than the inner diameter of the end portion of the valve body; and the larger diameter section of the end cover is configured to be subjected to a radially inward extrusion force during assembly of the end cover onto the valve body and to be foldingly deformed inwardly as a whole around the smaller diameter end of the end cover under the action of the radially inward extrusion force, so as to abut against an inner wall of the valve body. ### Claim 2 (depends on 1) The end cover according to claim 1, wherein the frustum-shaped larger diameter section of the end cover particularly has a conical angle of 4° to 32°. ### Claim 3 (depends on 2) The end cover according to claim 2, wherein the frustum-shaped larger diameter section of the end cover particularly has a generatrix length of 1 mm to 5 mm. ### Claim 4 (depends on 1) The end cover according to claim 1, wherein an end portion of the larger diameter section of the end cover has a radially projected flange for abutting against and fitting with an end surface of the valve body. ### Claim 5 (depends on 1) A four-way reversing valve comprising a main valve and a pilot valve, the main valve comprising an end cover and a valve body, characterized in that the end cover and the valve body are made of stainless steel material, and the end cover is the end cover according to claim 1. ### Claim 6 (depends on 5) The four-way reversing valve according to claim 5, wherein the frustum-shaped larger diameter section of the end cover particularly has a conical angle of 4° to 32°. ### Claim 7 (depends on 6) The four-way reversing valve according to claim 6, wherein the frustum-shaped larger diameter section of the end cover particularly has a generatrix length of 1 mm to 5 mm. ### Claim 8 (depends on 5) The four-way reversing valve according to claim 5, wherein an end portion of the larger diameter section of the end cover has a radially projected flange for abutting against and fitting with an end surface of the valve body. ### Claim 9 An assembling method of a four-way reversing valve, comprising steps of fixedly connecting a pilot valve with a valve body of a main valve by welding, assembling components including a slider, a link and a piston, and fixedly connecting an end cover with the valve body by welding, the end cover having a larger diameter section and a smaller diameter section sequentially provided in an axial direction, wherein an outer periphery of the larger diameter section of the end cover is tightly connected with the valve body, and an end portion of the smaller diameter section of the end cover is fitted with a piston of the main valve so as to define an operating position of the piston, characterized in that the end cover and an end portion of the valve body are connected by argon welding, laser welding or high energy-dense beam welding, wherein the larger diameter section of the end cover has a frustum shape with a larger outer end and smaller inner end, and an interference fit is formed between the outer end of the larger diameter section of the end cover and an inner wall of the valve body; and wherein the larger outer end of the larger diameter section of the end cover has a radial dimension greater than an inner diameter of the end portion of the valve body, and the smaller inner end of the larger diameter section of the end cover has a radial dimension smaller than the inner diameter of the end portion of the valve body; and the larger diameter section of the end cover is configured to be subjected to a radially inward extrusion force during assembly of the end cover onto the valve body and to be foldingly deformed inwardly as a whole around the smaller diameter end of the end cover under the action of the radially inward extrusion force, so as to abut against the inner wall of the valve body. ### Claim 10 (depends on 9) The assembling method of the four-way reversing valve according to claim 9, wherein before the end cover and the valve body are connected by welding, the end covers are pressed into two ends of the valve body under pressurization. ### Claim 11 (depends on 9) The assembling method of the four-way reversing valve according to claim 9, wherein an end portion of the larger diameter section of the end cover has a radially projected flange, and before the end cover and the valve body are connected by welding, the flange of the end cover is abutted against and fitted with an end surface of the valve body. ### Claim 12 (depends on 9) The assembling method of a four-way reversing valve according to claim 9, wherein the end cover and the valve body are made of stainless steel material.