A plant has a plurality of pumping units combined together, each of them being composed of a cylindrical housing, an expansible and constructible rubber diaphragm having a U-shaped longitudinal section to define a pressure chamber at one side and a pumping chamber at the other side, a liquid pressure source communicated with the pressure chamber, a liquid feed port communicated with the pumping chamber, a liquid discharge port communicated with the pumping chamber and used to send the liquid to a filter press, and an arm inserted into and slidingly movable in the housing and supporting the diaphragm at the free end thereof, and, particularly, a plant is provided with a plurality of housings (1) joined to a plant frame (7), and arms (5') inserted into and slidingly movable in these housings and supported pivotably on a single connecting bar (10) via pins, the arms (5') being moved forward and backward with a predetermined phase difference.
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