Document Type and Number:
Japanese Patent JPH0451718
Kind Code:
B2
Abstract:
A device for determining the level of particulate contamination in a hydraulic system. Between the inlet and outlet of the device the fluid passes through the narrow clearance between a piston and a surrounding bore. As the clearance becomes obstructed by contaminant, pressure rises in a chamber upstream of the piston. Rise of this pressure above a certain level is detected by a detector which both triggers a counter and operates a solenoid to withdraw the piston and release trapped contaminant, after which the piston returns and another cycle of contaminant build-up begins. The frequency of the release of the piston indicates the degree of contamination of the fluid. Instead of pressure build-up, parameters related to fluid flow may be used to trigger the counter and the release of contaminants from clearance, and means may be provided to meter individual, fixed-volume charges from the general body of fluid and discharge them through a clearance. The clearance may as an alternative be arranged to be cleared by back flushing.
Inventors:
MAACHIN JON FUITSUSHAA
ROJAA AATEINDEERU HERON
MAACHIN ROORENSU HYUUZU
ROJAA AATEINDEERU HERON
MAACHIN ROORENSU HYUUZU
Application Number:
JP21324782A
Publication Date:
August 19, 1992
Filing Date:
December 04, 1982
Export Citation:
Assignee:
NAT RES DEV
International Classes:
G01N7/00; B01D35/143; B01D35/147; F15B21/041; F17D3/16; G01N15/06
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