(57) A dosage pump, of the type comprising a hollow body (11) which is adapted to be interposed
between pipe portions of a hydraulic circuit and is provided internally with a rotating
element (12) provided with vanes, which rotates as a consequence of the flowing fluid
and is associated with means (13) for transmission and speed reduction and with means
(14) for converting the rotary motion into reciprocating rectilinear motion, which
in turn are connected to means (15) for drawing and pumping the liquid to be dosed,
the latter means being provided, inside a container (16) for the liquid which is fixed
to the hollow body (11), by an injection stem (17) which is moved by the motion conversion
means (14) so as to enter and exit with its end (18) from a dosage chamber (19), which
on the opposite side with respect to the entry side for the injection stem (17) is
closed by a flow control element (20), which is pushed closed by elastic means (21);
the chamber (19) is connected to the inside of the container (16) on the side of the
stem (17) and to a channel (22) for connection to a tube (23) for the rise of the
dosed liquid on the side of the flow control element (20) toward the hollow body (11).
The chamber (19) and the connection channel (22) are formed in a single body (24),
inside which the flow control element (20) with its elastic closure means (21) is
also fitted.
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