# US 2019/0376503 A1 · Diaphragm pump and valve plate thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376503 A1 - Document ID: US20190376503A1 - Status: Published application - Kind: A1 - Application number: 16/150,906 - Filed: 2018-10-03 - Published: 2019-12-12 - Earliest claimed: 2018-06-08 - Assignees: Koge Micro Tech Co., Ltd. - Applicants: Koge Micro Tech Co.,Ltd - Inventors: Po-Han Chang; Shu-Hong Lin; Hsien-Liang Cheng; Kang-Hung Yeh - Web page: https://patentgrep.com/patent/US20190376503A1 ## CPC - F04B 43/04: Pumps having electric drive - F04B 43/02: having plate-like flexible members, e.g. diaphragms (F04B43/14 takes precedence) - F04B 43/028: {with in- or outlet valve arranged in the plate-like flexible member (valve arranged in the piston F04B53/12)} - F04B 45/04: having plate-like flexible members, e.g. diaphragms (F04B45/10 takes precedence) - F04B 53/10: Valves; Arrangement of valves - F04B 53/103: {Flat-annular type disc valves} - F04B 53/1037: {Flap valves} - F04B 53/1087: {Valve seats} - F16K 15/02: with guided rigid valve members - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - 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)} ## Abstract A diaphragm pump includes a valve seat, a head cover covered on the valve seat, and a pair of valve plates. A surface of the valves seat is formed concavely with a first receiving trough with a first flow passage, and a second receiving trough with a second flow passage. One of the valve plates is disposed in the first receiving trough, and the other one is disposed in the second receiving trough. The first and second receiving troughs respectively have a geometric shape corresponding with that of the valve plate. The valve plate has a sealing part, and at least one extending arm extended outwardly from the sealing part. The sealing part has a geometric shape being bilaterally symmetrical. The extending arm has an arced end. A gap is existed between an edge of the valves plate and the first receiving trough or the second receiving trough. ## Claims ### Claim 1 A diaphragm pump, comprising: a valve seat, formed with a first receiving trough and a second receiving trough, the first receiving trough having a first runner gate, the second receiving trough having a second runner gate; a head cover, covering the valve seat; a pair of valve plates, one of the valve plates being disposed in the first receiving trough, and the first receiving trough having a geometric shape corresponding with a geometric shape of the valve plate; the other one of the valve plate being disposed in the second receiving trough, and the second receiving trough has a geometric shape corresponding with that of the valve plate; wherein the valve plate has a sealing part and at least one extending arm, the at least one extending arm is extended outwardly from a partial periphery of the sealing part, the sealing part has a geometric shape being bilaterally symmetrical, the at least one extending arm having an end shaped as a protrusion, a gap is formed between the valve plate the first receiving trough or the second receiving trough. ### Claim 2 (depends on 1) The diaphragm pump according to claim 1, wherein the at least one valve plate has a pair of the extending arms, the pair of extending arms are extended outwardly from two opposite sides of the sealing part in an identical width. ### Claim 3 (depends on 1) The diaphragm pump according to claim 1, wherein the sealing part of the valve plate has two semi-circular arcs to define a circle with a center and a diameter, a length from the center of the sealing part to an end of the extending arm is equal to 0.6 to 2.0 times the diameter of the sealing part. ### Claim 4 (depends on 3) The diaphragm pump according to claim 3, wherein a width of the extending arm is equal to 0.1 to 0.5 times the diameter of the sealing part. ### Claim 5 (depends on 1) The diaphragm pump according to claim 1, wherein a length from a center of the first runner gate of the first receiving trough to an end of the first receiving trough is defined as C2, a length from a center of the second runner gate of the second receiving trough to an end of the second receiving trough is defined as C2′, a length from the center of the sealing part of the valve plate to the end of the extending arm is defined as C1, wherein C2−C1≤0.2*C1, and C2′−C1≤0.2*C1. ### Claim 6 (depends on 1) The diaphragm pump according to claim 1, wherein an end of the extending arm is arced defined with a radius, the radius is equal to 0.3 to 0.5 times a width of the extending arm. ### Claim 7 (depends on 1) The diaphragm pump according to claim 1, wherein a thickness of the sealing part is equal to or larger than a thickness of the extending arm. ### Claim 8 (depends on 1) The diaphragm pump according to claim 1, wherein a thickness of the extending arm is smaller than or equal to a depth of the first receiving trough or the second receiving trough, a thickness of the extending arm is equal to 0.5 to 1 times a depth of the first receiving trough or the second receiving trough. ### Claim 9 (depends on 1) The diaphragm pump according to claim 1, wherein the first receiving trough or the second receiving trough respectively have at least one extending zone, a width of the extending arm is subtracted from a width of the extending zone of the first receiving trough, or a width of the extending zone of the second receiving trough is smaller than or equal to two times the width of the extending arm. ### Claim 10 (depends on 1) The diaphragm pump according to claim 1, wherein the valve seat is formed with a positioning wall, the positioning wall is disposed around a partial periphery of the second receiving trough, so as to restrict the extending arm of the valve plate. ### Claim 11 (depends on 1) The diaphragm pump according to claim 1, wherein the first receiving trough or the second receiving trough respectively have at least one extending zone, and the extending arm of the valve plate is disposed in the extending zone, wherein the at least one extending zone having an end being shaped in a pyramid, and two slanted surfaces faced to each other, the slanted surfaces respectively contact an arced end of the extending arm. ### Claim 12 (depends on 1) The diaphragm pump according to claim 1, wherein one of the valve plates has a top surface being flush with the top surface of the valve seat, the other one of the valve plates has a bottom surface being flush with the top surface of the valve seat. ### Claim 13 (depends on 1) The diaphragm pump according to claim 1, wherein the second receiving trough has a extending zone, and the extending zone has a abutting surface and a ramp on a bottom surface thereof, the abutting surface is adjacent to an end of the extending zone, the abutting surface supports the extending arm of the valve plate, the ramp is extended from the abutting surface toward the second runner gate, the ramp is not contacted with the extending arm of the valve plate. ### Claim 14 A valve plate, comprising: a sealing part, and at least one extending arm, outwardly extended from the sealing part in an identical width, the sealing part having two semi-circular arcs opposite to each other, the at least one extending arm has an protruded end, the valve plate having a flat upper surface and a flat lower surface. ### Claim 15 (depends on 14) The valve plate according to claim 14, wherein the sealing part of the valve plate is shaped in a circle and defined with a center and a diameter, a length from the center of the sealing part to the end of the extending arm is equal to 0.6 to 2.0 times the diameter of the sealing part. ### Claim 16 (depends on 14) The valve plate according to claim 14, wherein the width of the extending arm is equal to 0.1 to 0.5 times the diameter of the sealing part. ### Claim 17 (depends on 14) The valve plate according to claim 14, wherein the end of the extending arm is arc-shaped defined with a radius, the radius of the end of the extending arm is equal to 0.3 to 0.5 times a width of the extending arm. ### Claim 18 (depends on 14) The valve plate according to claim 14, wherein a thickness of the sealing part is equal to or larger than a thickness of the extending arm. ### Claim 19 (depends on 14) The valve plate according to claim 14, wherein the valve plate has a sealing side and a non-sealing side, a hardness of the sealing side is smaller than a hardness of the non-sealing side.