Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1989-09-08
1990-12-18
Chambers, A. Michael
Pumps
Expansible chamber type
Mechanically actuated distributor
F04B 700
Patent
active
049782835
ABSTRACT:
A chop-check pump for viscous material having cylinder means defining an axis, a drive rod axially movable within the cylinder means, a primer valve attached at one end of the drive rod and movable with the drive rod, and a floating check valve mechanism associated with the cylinder means at an outlet from the cylinder means through which the drive rod extends into the cylinder means. The primer valve includes a distal valve plate secured to the drive rod and a slidable valve plate on the drive rod slidable between a position against the distal valve plate and a position spaced from the distal valve plate. There are flow passages in both valve plates. Preferably, the flow passages in the slidable valve plate and the distal valve plate have a cross sectional area slightly less than the cross sectional area of the respective plates. In one embodiment, the slidable valve plate has a radial extent greater than that of the distal valve plate. The bottom of the distal valve plate is configured with a sharp leading edge for facilitating movement of the primer valve into the viscous material to be pumped.
REFERENCES:
patent: 1357624 (1920-11-01), Drew
patent: 2741994 (1956-04-01), Donn
patent: 3335673 (1967-08-01), DeForrest
patent: 3532446 (1970-10-01), Herreshoff
patent: 3809508 (1974-05-01), Uchiyama
patent: 4518328 (1985-05-01), Nemoto
Chambers A. Michael
The Aro Corporation
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