Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1978-05-12
1980-04-15
Gluck, Richard E.
Pumps
Expansible chamber type
Mechanically actuated distributor
417519, 417532, 417900, F04B 1502, F04B 700
Patent
active
041981936
ABSTRACT:
A pivotal pipe valve unit for concrete supply hoppers having a pair of concrete pumps of the piston-cylinder type which includes a shuttle valve pipe mounted within the hopper for pivoting about a discharge line. The inlet end is spaced slightly from a wear plate which encompasses the cylinder openings to the hopper and is pivoted for alternate alignment with the discharge opening from the pump cylinders. An outer base member is secured to the inlet end and has an annular recess receiving a wear ring. A hydraulic source is coupled to the chamber and creates a pressurized liquid backing of the ring. An annular seal with a metal backing is located to the backside of the ring. An accumulator tank is connected to the hydraulic supply system to firmly hold the ring in sliding sealing engagement with the wear plate with a cushioned type support. The wear ring is slightly thinner than the annular recess and may tilt such that the ring and wear plate sealing surfaces remain parallel. O-ring seals between the periphery of the ring and recess walls prevent the abrasive concrete from entering the chamber.
Walters James F.
Westerlund Robert E.
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