| 摘要 |
<p>Piston pump for conveying of thick flowing substances especially concrete has a circular operating chamber in whiih a piston is moved along a circular track, with a control device by which the operating chamber may be connected in the direction of movement to a pressure pipe in front of the piston and in each case in the direction of movement to a suction pipe being the piston. The piston has a reversible drive with both reversing points of the piston located in the immediate proximity before and behind the control device (15) which breaks up the circular extent of the operating chamber (1a) by a double vane control valve (16, 17) or a separating walls.</p> |
