Spool valve for concrete pumps

Expansible chamber devices – With assembly or disassembly facilitating means

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Details

92129, 92168, 251 634, 277187, F01B 2900, F16J 110

Patent

active

048524670

ABSTRACT:
In a spool valve for thick matter pumps comprising at least one slide rod running forward and backward which is movable in a guide means and surrounded by a seal, and a drive consisting of working pistons associated with each slide rod, the working pistons each cooperating with one end of the slide rod directed out of a valve casing, and their driving cylinders ending a distance away from the valve casing, the end of the slide rod which runs forward out of the casing being cleaned of adhering thick matter during the backward movement of the piston, the invention provides for the guide means to be disposed on the inside and the seal separate therefrom to be disposed on the outside in front thereof on the valve casing, and for the parts supported loosely on each other in the operative connection between the working piston and the end of the slide rod to provide a gap which is used for assembling and dismounting the seal, the cleaning of the end of the slide rod being effected by the stripping action of the seal.

REFERENCES:
patent: 2010129 (1935-08-01), Baker
patent: 2042078 (1936-05-01), Suhm et al.
patent: 2787126 (1957-04-01), Kleczek
patent: 2936996 (1960-05-01), Mercer
patent: 3070070 (1962-12-01), Trevor
patent: 3402592 (1968-09-01), Machon et al.
patent: 3490735 (1970-01-01), Nielsen et al.
patent: 3640303 (1972-02-01), Verheul
patent: 4089253 (1978-05-01), Visser
patent: 4215713 (1980-08-01), Kuhlmann

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