| 摘要 |
A movable piston is supported by a flexible angular membrane around the perimeter of the piston in a piston chamber, having opposed walls which confront the opposite faces of the piston. The chamber has low and high pressure sides at said opposite sides of the piston. The potential movement of the piston is limited by contact of the piston face with the chamber wall, with the entire resistance to piston movement beyond the limit point being born by the chamber. The piston controls activation of an electric switch in response to movement of the piston. |
