| 摘要 |
<p>PURPOSE:To perform a continuous change of an operation lower limit value at any time by magnetizing a magnetic substance arranged in a gas chamber or a piston against a magnet provided on the piston or the gas chamber by means of a coil provided on the outside portion of a container, and overlapping the suction force or the discharge force on the gas pressure. CONSTITUTION:A magnet 16 is provided on a piston 13 for partitioning the inside of a container 11 constituted by a cylindrical shell 11A and edge surface members 11B, 11C into a gas chamber 12A and a liquid chamber 12B. A magnetic substance 17 is fixed in the edge surface member 11C, and a coil 18 is provided on those peripheries and DC power supply is connected thereto. Thereby the suction force or the repulsive force of the magnet 16 or the magnetic substance 17 is exerted on the piston 13 to overlap this force on the gas pressure of the gas chamber 12A. Consequently, the gas pressure can be changed on request to change and regulate the operation lower limit value continuously at any time.</p> |
