Pumping unit for liquids, especially two-component liquids

1. The pumping unit for liquids, especially two-component liquids, consists of an engine, piston pumps with a differential piston, control valves, a divider and fittings. Characterized in that: The piston rods (1) of the pumps (2), located in the axis of the piston engine (3), are connected at both engine sides by means of a screwed-in tension member (4), which goes with a clearance through the hollow piston rod (5) of the engine (3). The piston rod constitutes a distancing element between the connected piston rods. Pairs of washers, consisting of a concave (6) and a convex (7) washer, are secured between the front surfaces of the piston rods. The piston rod (5) of the engine is fixed to the piston (8) of the engine with the radial clearance (L). Moreover, the internal cylinder diameters (D) of the pumps (2) are adjusted to obtain the required mixing proportion of liquid components. The ratio of the working volume (A) under the piston to the working volume (B) over the piston of each pump is 1:2.