| 摘要 |
Apparatus for measuring and/or controlling pressures appearing in succession at the same measuring point has a cylinder arranged at a measuring point and defining a chamber. A piston defining a plurality of control passages is arranged in the cylinder chamber so as to be moved by successive pressures appearing at the measuring point. A measuring line is associated with each of the control passages defined in the piston. Means are provided for imparting a rotary control movement to the piston by means of the successive pressures and for consecutively connecting the measuring lines to the measuring point through at least one of the plurality of control passages defined in the piston. The control movement imparting means may be a guide pin cooperating with a circumferential guide groove defined in the piston, or it may be two pairs of cooperating crown gears.
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