Hydraulic device for fuel pumping apparatus

Details Hydraulic device for fuel pumping apparatus Hydraulic device for fuel pumping apparatus

1988-04-04

1989-10-03

Garrett, Robert E.

Motors: expansible chamber type

Constantly applied motive fluid with controlled venting

Fluid vented through working member

91401, 91419, 91422, 92 136, 92130D, 123387, 137503, 137508, F15B 1522

Patent

active

048708895

ABSTRACT:
A hydraulic device includes a piston slidable within a cylinder. Fluid under pressure is admitted to one end of the cylinder through an inlet which contains a restrictor. The piston is formed with an orifice and is biased by a first spring towards the one end of the cylinder. A thrust rod is engageable by the piston to transmit the movement of the piston to an external mechanism. When the piston is moved by rising fluid pressure the orifice is closed by the end of the thrust rod so that a higher value of fluid pressure is required to effect the initial movement of the piston than is required to allow the return movement of the piston.

REFERENCES:
patent: 2875732 (1959-03-01), Hoffman
patent: 3450005 (1969-06-01), Ellis
patent: 3974853 (1976-08-01), Bentley

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