Hydraulic actuator controls

Details Hydraulic actuator controls Hydraulic actuator controls

1979-05-21

1980-11-25

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

G01F 122

Patent

active

042351057

ABSTRACT:
A fluid flow sensor comprises a hollow spool (58) displaceable on a spindle (66) against a spring (68). A sharp peripheral edge of a peripheral bead (80) on the spool (58) co-operates with the wall (61) of a throat (60) to form an annular flow path between chambers (92 and 90) in a housing (28) as the spool is displaced by the fluid pressure difference between the chambers (92 and 90). In the illustrated resting position of the spool (58), the peripheral bead (80) seats against a valve seat (57) and a residual flow path between the chambers (90 and 92) is provided by a small bleed orifice (89) in the wall of the spool. The pressure difference between the chambers (92 and 90) provides a measure of the fluid flow rate over a very wide range of flow rates.
In a modification, the bleed orifice is pre-adjustable.

REFERENCES:
patent: 2941401 (1960-06-01), Streeter
patent: 3252324 (1966-05-01), Steele
patent: 4112757 (1978-09-01), Hayward

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