FIELD: engines and pumps.
SUBSTANCE: invention is intended for dosing both large and small volumes of dye. Pump comprises large reciprocating positive displacement pump with larger part with reciprocating motion, larger pump housing, inlet and outlet openings of large pump. Small part with reciprocating movement, attached to large part with reciprocating motion, is located in the housing of large pump. Small pump housing is located on the housing of large pump and has inlet and outlet holes of small pump. Small part with reciprocating motion, small pump housing, inlet and outlet holes of small pump form small reciprocating positive displacement pump. Small reciprocating pump is a folding pump.
EFFECT: reciprocating positive displacement pump can provide dosing both of large volume and small volume of dye by using pump of large cross-section and thus ensures accuracy of dosed volume of dye and, in particular, accuracy of dosed small volume of dye.
13 cl, 43 dwg
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