US3963385A - Valve assembly for concrete pumps - Google
An improved valve assembly providing a constant flow of semi-fluid concrete material through a concrete-pump assembly having a hopper to receive the concrete material and a plurality of hydraulically-actuated concrete pumps operably communicating with the hopper through inlet ports disposed in one wall of the hopper, the valve assembly being operably mounted within the hopper to oscillate therein.
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A constant flow concrete pump having a number of hydraulically actuated concrete pump assemblies connected to inlet openings in one wall of a semi-fluid concrete hopper which has a single discharge opening in the opposite wall, and a valve mounted in the hopper and having an inlet of sufficient length to encompass at least two of the inlet openings in the hopper wall, relative movement is provided between the valves and inlet openings to provide constant flow of concrete …
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