Compact twin piston pump

F - Mech Eng,Light,Heat,Weapons – 04 – B

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F04B 15/02 (2006.01) F04B 7/00 (2006.01) F04B 7/02 (2006.01) F04B 53/14 (2006.01) F16K 27/04 (2006.01)

Patent

CA 1301546

COMPACT TWIN PISTON PUMP Abstract of the Disclosure A compact, relatively low Cost twin piston pump (20) especially adapted for the pump ing of foods (e.g. juices, puddings or particu- lates such as stews and chilies) is provided which includes quick detach yoke and clevis assemblies (108, 124, 110, 126) connecting the reciprocable pistons (100, 102) with their associated hydraulic cylinders (116, 118), thereby permitting quick cleanup of the machine (20). A jacking screw plate (136) is used for forward mounting of the piston and cylinder assemblies (84, 86, 116, 118) coupled with the sleeves (42, 44) and associated pistons (100, 102). This permits precise adjust- ment of the working components of the machine, while eliminating expensive bearings and heavy duty framing members. The pump (20) is also provided with a slide plate-type valve (38, 184) for controlling output of product from the pump (20). In one valve embodiment (184) a two-part metallic slide plate assembly (192, 200) is sand- wiched between a pair of apertured nylon plates (186). One of the slide plate parts (200) is of lesser thickness than the primary part (192), so as to permit limited fore-and-aft movement of the part (200) for sealing purposes. A unique hy- draulic system employing a master pressure reduc- ing valve (222) and a slaved pressure reducing valve (224) is employed for creating a pressure differential across the part (200) in order to bias the same for sealing purposes.

615832

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