Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1995-01-04
1996-03-19
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137539, 137544, 254 93H, B66F 324
Patent
active
054996554
ABSTRACT:
An improved one-way valve structure for a hydraulic jack includes a stepped inlet end at a L-shaped intake passage for fixing of a filter. The diameter of the filter is slightly smaller than the inner diameter of the intake passage. The filter is designed so that it can be firmly positioned in the inlet end of the intake passage. Hydraulic fluid is filtered by the filter at the intake passage while it is passing through the one-way valve so that foreign particles in the hydraulic fluid from an oil reservoir are completely prevented from entering a pump seating and a pumping cylinder. Hence, the hydraulic fluid entering the pumping cylinder upon pushing of a handle on the pump seating does not contain impurities. In particular, as there are no foreign particles clogging the pressure release passage, normal pressure relief whenever the jack is overloaded can be assured to discharge the hydraulic fluid to the oil reservoir automatically. Consequently, damage to or explosion of the cylinder can be prevented.
REFERENCES:
patent: 2202211 (1940-05-01), Kling
patent: 4703916 (1987-11-01), Hung
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