Pipeline switch with leakage control and cleanable leakage cavity

Abstract

Apparatus for cleaning a liquid connection and securing a stroke and spring abutment for double seat pipeline switches with leakage control, comprising a pipeline switch housing, a pipeline switch drive mounted within the switch housing, two valve disks of different sizes, two concentrically mounted valve rods of different lengths, one of the valve rods being hollow, the one of longer length fitting within the other of shorter length, the inside valve rod being connected to the pipeline switch drive and the smaller of the two valve disks, the inside valve rod upon being lifted by the drive carrying along the valve disk of larger size, the valve disks in both the closed position and the open position enclosing between themselves a leakage cavity, one end of the hollow valve rod defining a pressing and guide part with a spring abutment and a connecting opening adapted to receive a cleaning fluid, a rod head forming a portion of the longer valve rod and defining a connecting opening, an upper spring abutment and an upper stop surface for the pressure and guide part, and a spring between the rod head and the pressing and guide part to bias them apart, the valve rod of longer length defining an axial bore with transverse holes communicating with the leakage cavity and the connecting opening in the valve head, the pressing and guide part communicating around the valve rod of longer length and through the leakage cavity with the axial bore and connecting opening of the valve head to provide a fluid passageway for the cleaning fluid through the apparatus.