(57) A machine (1) comprising two meshing gears (5, 6); two bushes (13) supporting the
gear hubs (7, 8); a machine body (2) housing the gears (5, 6) and bushes (13); and
two cover plates (3, 4) for the machine body (2). Each plate (3, 4) presents a seat
(26) for a seal (25) formed in one piece and comprising a first annular element (27),
and a second annular element (28) inwards of and joined over a long portion to the
first annular element (27) by a thin wall (34) defining two channels (35, 36) for
high-pressure fluid. The seal (25) defines two gaps, one for low-pressure fluid, defined
by the second element (28), and the other for high-pressure fluid, defined by both
elements (27, 28).
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