Pipe switch for two-cylinder thick-material pump

Abstract

The present invention relates to a pipe switch for a dual-cylinder thick-liquid pump, wherein said system comprises a pivoting pivot pipe ( ) located in the front of a glasses-like wear plate ( ) on the cylinder side as well as a wear ring ( ) which is capable of limited axial displacement at the end of the pivot pipe ( ) on the cylinder side. The ring can be pressed against the wear plate ( ) by the hydrostatic pressure existing inside said pivot pipe. The wear ring has a centering portion ( ) guided on an axis-parallel centering surface ( ) of the pivot pipe ( ) as well as a sealing part ( ) resting against the wear plate ( ) through an abutment surface ( ) on the cylinder side. The pivot pipe ( ) and the sealing part ( ) of the wear ring ( ) have annular surfaces ( ) which face each other and which are axially spaced from one another by an annular gap ( ) opened towards the inside of the pipe. An annular system ( ) exhibiting at least a rubber elasticity is further provided, wherein said system axially covers the annular gap ( ) and has its abutment surfaces ( ) resting in a prestressed manner against each of the annular surfaces ( ). In order to allow for an automatic anti-wear readjustment of the wear ring, the annular system ( ) has an axial annular support ( ) provided on its abutment surface ( ) which faces the centering portion ( ) of the wear ring ( ), wherein said support ( ) is made of a wear-resistant material which is more rigid than the rubber-elastic material.