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да, скорее подвижная поверхность камеры давления, там дальше идет описание.The pressure chamber face can be of a plurality of types. Generally it is a face, the movement of which leads to a change of volume in the pressure chamber which it faces. It can, for instance, be a piston which can be mounted to the rod element. It can also be a membrane in a membrane pump which is mechanically connected to the rod element. Furthermore, it can be a movable part of a pressure chamber of a pump. The rod element can be connected to the pressure chamber mechanically or through a fluid connection. Thus, the rod element can itself be a piston, for instance, of which moving energy is hydraulically transferred to a pump or compressor
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