Patent ID: 6450779
Filing Date: 2002-09-17
Classification: F04B,Y10S

Abstract:
A two-cylinder thick-matter pump for continuous delivery of thick matter, in particular for continuous delivery of concrete, which has in particular two delivery cylinders for delivering thick matter out of a suction pipe into a delivery pipe and a reversing valve with a swiveling diverter for reversing between the first and second delivery cylinders, characterized in thata) the reversing valve has a diverter housing with at least four openings, the first and second openings being adapted to be connected to the first and second delivery cylinders, the third opening to the suction pipe and the fourth opening to the delivery pipe, b) the diverter disposed in the diverter housing has an inlet opening which opens into the third opening of the diverter housing and is firmly connected with the suction pipe and an outlet opening which swivels between the first and second openings for connecting the delivery cylinders, and during changeover of the diverter from providing fluid communication with the first delivery cylinder to providing fluid communication with the second delivery cylinder, both the first delivery cylinder and the second delivery cylinder are momentarily in simultaneous fluid communication with the outlet opening, c) between the diverter's outside wall and the diverter housing's inside wall there is a cavity which forms the pressure line providing fluid communication between the particular pumping delivery cylinder and the delivery pipe, the cavity being constantly under delivery pressure from at least one delivery cylinder and during changeover of delivery cylinders being under delivery pressure from both delivery cylinders, and d) at least one shut-off element is provided for closing one or more of the suction pipe, the first opening, and the second opening of the diverter housing.