# US 2009/0267014 A1 · Fluid On-Off Valve Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0267014 A1 - Document ID: US20090267014A1 - Status: Published application - Kind: A1 - Application number: 11/887,727 - Filed: 2006-04-13 - Published: 2009-10-29 - Earliest claimed: 2005-04-14 - Assignees: Toyota Jidosha Kabushiki Kaisha - Inventors: Tsukuo Ishitoya; Nobuo Kobayashi; Nobuyuki Ogami; Akira Yamashita - Web page: https://patentgrep.com/patent/US20090267014A1 ## CPC - F16K 25/005: {Particular materials for seats or closure elements} - F16J 15/104: {characterised by structure} - F16J 15/48: influenced by the pressure within the member to be sealed - F16K 1/44: Details of seats or valve members of double-seat valves - F16K 15/025: {the valve being loaded by a spring (F16K15/03 - F16K15/12 take precedence)} - Y10T 137/7868: Resilient gasket - Y10T 137/7869: Biased open - 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)} - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A check valve (fluid on-off valve device) capable of attaining high sealability in either case where a differential pressure is high or low, comprises a valve body assembly (valve body) contacting and separating from a valve seat portion for communicating and blocking a fluid passage. The valve body assembly comprises a valve body, a low-pressure seal portion constituted out of soft material and a high-pressure seal portion constituted out of harder material than the low-pressure seal portion. In blocking a fluid passage, when a differential pressure between an upstream path and a downstream path in the fluid passage is relatively low, the low-pressure seal portion comes into close contact with a protrusion to block the fluid passage, while when the differential pressure is relatively high, the low-pressure seal portion is compressively deformed by the differential pressure and the high-pressure seal portion comes into close contact with the valve seat body, thus blocking the fluid passage. ## Claims ### Claim at position 1 1-3. (canceled) ### Claim 4 A fluid switching valve device comprising: a valve seat portion; a valve body contacting and separating from the valve seat portion to communicate and block between upstream and downstream paths in a fluid passage, wherein: the valve body includes a first seal portion sealing between the valve seat portion and the valve body and a second seal portion having higher hardness than the first seal portion; a direction in which the valve body contacts and separates from the valve seat portion and a flow direction of the fluid introduced from the upstream path in the fluid passage cross each other; the first seal portion and the second seal portion are disposed in parallel to, each other, the orthogonal direction to the valve body contact/separation direction; and in blocking the fluid passage by a differential pressure between upstream and downstream paths in the fluid passage, when the differential pressure is less than a predetermined value, the first seal portion is allowed to come into close contact with the valve seat portion for blocking of the fluid passage and, on the other hand, when the differential pressure is the predetermined value or higher, the first seal portion in close contact with the valve seat portion is allowed to be compressively deformed by the differential pressure and the second seal portion is allowed to come into close contact with the valve seat portion for blocking of the fluid passage. ### Claim 5 A fluid switching valve device comprising: a valve seat portion; a valve body contacting and separating from the valve seat portion to block and communicate between upstream and downstream paths in a fluid passage, wherein: the valve body includes a first seal portion sealing between the valve seat portion and the valve body and a second seal portion having higher hardness than the first seal portion; a direction in which the valve body contacts and separates from the valve seat portion and a flow direction of the fluid introduced from the upstream path in the fluid passage cross each other; the first seal portion is disposed on the upstream side of the second seal portion in the flowing direction; and in blocking the fluid passage by a differential pressure between upstream and downstream paths in the fluid passage, when the differential pressure is less than a predetermined value, the first seal portion is allowed to come into close contact with the valve seat portion for blocking of the fluid passage and, on the other hand, when the differential pressure is the predetermined value or higher, the first seal portion in close contact with the valve seat portion is allowed to be compressively deformed by the differential pressure and the second seal portion is allowed to come into close contact with the valve seat portion for blocking of the fluid passage. ### Claim 6 (depends on 4) The fluid switching valve device according to claim 4, wherein: part of the valve body constitutes the second seal portion. ### Claim at position 5 7-8. (canceled) ### Claim 9 (depends on 4) The fluid switching valve device according to claim 4, wherein: a distance from an end surface in close contact with the valve seat portion of the first seal portion to the valve seat portion is set shorter than that from an end surface in close contact with the valve seat portion of the second seal portion to the valve seat portion. ### Claim 10 (depends on 4) The fluid switching valve device according to claim 4, said device including restoring means giving a restoring force to the compressively-deformed first seal portion. ### Claim 11 (depends on 4) The fluid switching valve device according to claim 4, wherein: the valve seat portion includes a valve seat body and a valve-seat-side seal portion softer than the valve seat body and the valve-seat-side seal portion is disposed at a position facing the first seal portion. ### Claim 12 (canceled) ### Claim 13 (depends on 4) The fluid switching valve device according to claim 4, wherein: the first seal portion is constituted out of any of rubber, resin and metal, while the second seal portion is constituted out of either of resin or metal. ### Claim 14 (depends on 4) The fluid switching valve device according to claim 4: said device being provided in a fluid passage through which high-pressure gas having a differential pressure between upstream and downstream pressures kept under a predetermined pressure or higher passes. ### Claim 15 (depends on 14) The fluid switching valve device according to claim 14, wherein: the high-pressure gas is fuel gas supplied for generation of electric energy or heat energy. ### Claim 16 (depends on 15) The fluid switching valve device according to claim 15, wherein: the fuel gas is hydrogen gas or natural gas. ### Claim 17 (depends on 14) The fluid switching valve device according to claim 14, wherein: any of a check valve, a on-off valve and a relief valve is provided in the flow passage. ### Claim 18 (depends on 5) The fluid switching valve device according to claim 5, wherein: part of the valve body constitutes the second seal portion. ### Claim 19 (depends on 5) The fluid switching valve device according to claim 5, wherein: a distance from an end surface in close contact with the valve seat portion of the first seal portion to the valve seat portion is set shorter than that from an end surface in close contact with the valve seat portion of the second seal portion to the valve seat portion. ### Claim 20 (depends on 5) The fluid switching valve device according to claim 5, said device including restoring means giving a restoring force to the compressively-deformed first seal portion. ### Claim 21 (depends on 5) The fluid switching valve device according to claim 5, wherein: the valve seat portion includes a valve seat body and a valve-seat-side seal portion softer than the valve seat body and the valve-seat-side seal portion is disposed at a position facing the first seal portion. ### Claim 22 (depends on 5) The fluid switching valve device according to claim 5, wherein: the first seal portion is constituted out of any of rubber, resin and metal, while the second seal portion is constituted out of either of resin or metal. ### Claim 23 (depends on 5) The fluid switching valve device according to claim 5: said device being provided in a fluid passage through which high-pressure gas having a differential pressure between upstream and downstream pressures kept under a predetermined pressure or higher passes.