| 摘要 |
The invention provides a diaphragm-type hydraulic displacer unit of the kind which includes a piston-like member arranged to move inwardly and outwardly of a cylinder-like member, the annular gap between the piston and cylinder being bridged by a flexible diaphragm and in which during operation the ration between the maximum stroke of which the unit is capable and the maximum effective bore of the diaphragm, occurring in operation, is at least 1.2 : 1, and may be 2 : 1 or more, and in which during all operative conditions the pressure across the unsupported diaphragm loops exceeds 100 pounds per square inch.
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