# US 6,293,307 B1 · Valve assembly with check valve for gas cylinder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,293,307 B1 - Document ID: US6293307B1 - Status: Granted - Kind: B1 - Application number: 09/813,785 - Filed: 2001-03-22 - Published: 2001-09-27 - Granted: 2001-09-25 - Earliest claimed: 2000-03-22 - Assignees: Kabushiki Kaisha Neriki - Inventors: Akira Oi; Mari Shiotsuki; Mitsumasa Kagomoto - Web page: https://patentgrep.com/patent/US6293307B1 ## CPC - F16K 1/305: {with valve member and actuator on the same side of the seat} - F16K 15/18: with actuating mechanism; Combined check valves and actuated valves - Y10T 137/7727: Excessive flow cut-off - Y10T 137/88054: Direct response normally closed valve limits direction of flow - 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 cylinder (32) is hermetically attached into an attaching bore (31) formed within a housing (4) and is made to advance and retreat between a take-out position (A) and a charging position (B). A check valve chamber (28) is formed within the cylinder (32). A check spring (43) resiliently pushes a check valve member (29) inserted into the check valve chamber (28) toward a check valve seat (42). The cylinder (32) has an outer surface provided with an actuation portion (50). If the actuation portion (50) is pushed, it retracts the cylinder (32) toward the charging position (B). Provided at a position opposing to the check valve member 29 through a chamber inlet (40) of the check valve chamber (28) is a receiving portion (46), which receives the check valve member (29) on a halfway while the cylinder (32) is retreating. ## Claims ### Claim 1 A valve assembly with a check valve comprising: a housing (4) having a bore (31) for attaching an inlet bore (6,7), a shut off valve chamber (10,21), an outlet bore (18) and a check valve (80); a cylinder (32) having an outer surface, which is hermetically attached into the attaching bore (31) and is made to advance and retreat between a take-out position (A) and a charging position (B); a check valve chamber (28) formed within the cylinder (32), the check valve chamber (28) having a chamber inlet (40) which communicates with the inlet bore (6,7) through the shut off valve chamber (10,21) and a chamber outlet (41) which communicates with the outlet bore (18); a check valve seat (42) formed on a periphery of the chamber inlet (40); a check valve member (29) inserted into the check valve chamber (28); a check spring (43) inserted into the check valve chamber (28) and resiliently pushing the check valve member (29) toward the check valve seat (42); an actuation portion (50) provided in an outer surface of the cylinder (32) between the attaching bore (31) and the cylinder (32), the actuation portion (50) being pushed to retract the cylinder (32) from the take-out position (A) to the charging position (B); and a receiving portion (46) which receives the check valve member (29) on a halfway while the cylinder (32) is retreating from the take-out position (A) to the charging position (B). ### Claim 2 (depends on 1) The valve assembly with the check valve as set forth in claim 1, wherein a pressure chamber (48) is provided within the attaching bore (31), fluid pressure within the pressure chamber (48) being acted onto the actuation portion (50) to retract the cylinder (32) from the take-out position (A) to the charging position (B). ### Claim 3 (depends on 1) The valve assembly with the check valve as set forth in claim 1 further including an insertion hole (64) which communicates the attaching bore (31) with an exterior of the housing (4) and a pushing means (65) which is inserted into the insertion hole (64) and pushes the actuation portion (50). ### Claim 4 (depends on 1) The valve assembly with the check valve as set forth in claim 1 further including a return spring (37) which is arranged within the housing (4) and resiliently pushes the cylinder (32) toward the take-out position (A). ### Claim 5 (depends on 4) The valve assembly with the check valve as set forth in claim 4, wherein the cylinder (32) has a hermetically sealing and sliding portion (53) and the return spring (37) has a resilient pushing force set to a value larger than that of a reversely flowing fluid pressure applied to a sectional area (54) of the hermetically sealing and sliding portion (53). ### Claim 6 (depends on 4) The valve assembly with the check valve as set forth in claim 4, wherein the cylinder has a hermetically sealing and sliding portion (53) and the return spring (37) has a resilient pushing force set to a value larger than that of a reversely flowing fluid pressure applied to a differential area obtained by deducting a sectional area (55) of a valve face of the check valve member (29) from a sectional area (54) of the hermetically sealing and sliding portion (53). ### Claim 7 (depends on 1) The valve assembly with the check valve as set forth in claim 1, wherein the cylinder (32) has a hermetically sealing and sliding portion (53) and a valve face of the check valve member (29) has a sectional area (55) set to a value larger than that of a sectional area (54) of the hermetically sealing and sliding portion (53). ### Claim 8 (depends on 1) The valve assembly with the check valve as set forth in claim 1, wherein the chamber outlet (41) is formed to have an inner diameter not less than that of the outlet bore in dimension. ### Claim 9 (depends on 1) The valve assembly with the check valve as set forth in claim 1 further including an engaging portion (68) provided in the cylinder (32) and a limiting means (69) provided in the attaching bore (31), the limiting means (69) engaging with the engaging portion (68) to limit the cylinder (32) from retreating toward the charging position (B) when the cylinder (32) is switched over to the take-out position (A), and cancelling the engagement, thereby allowing the cylinder (32) to retreat toward the charging position (B).