| 摘要 |
PROBLEM TO BE SOLVED: To provide a control valve for stabilizing the property of a cylinder/piston unit so that gas spring holding force or general action during operation, which strongly depend on a temperature, do not depend on the temperature. SOLUTION: During the contraction of the cylinder/piston unit 1, compressed gas in a lead-in gas storage chamber 6 moves to a lead-out gas storage chamber 5 through a gas flow path 11 of a piston circumferential portion, a piston ring groove 8 and an annular gas flow path 12 in a piston in the routes of arrowmarks b1, b2, b3. During elongation of the unit, the compressed gas in the lead-out gas storage chamber 5 moves into the lead-in gas storage chamber 6 through the annular gas flow path 12 and a valve seat flow path 19 in the routes of arrowmarks a1, a2, a3. When exceeding a predetermined temperature, a valve seat 13 is opened, and otherwise, the valve seat 13 is shut off. Even when a ball valve 14 is pushed out of the valve seat 13 with the forcible operation of extension during shut-off, stress on a bimetal disc 15 is absorbed by a spiral spring 18. COPYRIGHT: (C)2007,JPO&INPIT
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