(57) A piston 1 sliding in a cylinder 2 operates a first controlled member. A cut-off
valve 3 controls a fluid flow destined for the operation of a second controlled member.
The piston 1 is provided with a head portion 6 that, in proximity of the end of every
advancement stroke of the piston, is automatically connected to a sliding control
16 of the shutter 4 of the cut-off valve 3 to cause the opening of the latter. Still
automatically, said head portion 6 leaves said shutter 4 at a prefixed point of the
successive return stroke of the piston.
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