Liquid purification or separation – Flow – fluid pressure or material level – responsive – Vent control
Patent
1996-11-26
1998-06-30
Drodge, Joseph W.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Vent control
210130, 210137, 210168, 210472, B01D 3501, B01D 35143, B01D 35157
Patent
active
057728682
ABSTRACT:
To simplify the venting of a hydraulic circuit comprising a supply of hydraulic fluid, which is made available to a hydraulic consuming device via a pump, and a return filter comprising a filter housing and a filter element for filtering the hydraulic fluid returning from the consuming device in a return line, it is suggested that the return line comprise prior to entering the return filter a first pressure-maintaining valve which allows the return of the hydraulic fluid to the return filter only when a predetermined first pressure value is exceeded, that the return line be connected upstream in relation to the first pressure-maintaining valve to a venting device leading to the atmosphere and to a bypass line which contains a second pressure-maintaining valve and opens into the supply, wherein the second pressure-maintaining valve opens only when a predetermined second pressure value is exceeded and allows the return of the hydraulic fluid past the return filter to the hydraulic fluid supply, wherein the second pressure value is greater than the first pressure value, and that the venting device allows gas to flow out into the atmosphere but prevents the exit of hydraulic fluid.
REFERENCES:
patent: 3227279 (1966-01-01), Bokelman
patent: 3996137 (1976-12-01), Cooper
patent: 4051031 (1977-09-01), Suzuki
patent: 5334309 (1994-08-01), Huggett et al.
H. Reinhardt, "Bypassventil in Hydrofiltern," Olhydraulik und Pneumatik, vol. 19, No. 5, 1975, Mainz, Germany, pp. 409-412.
"Hydraulic Filtration," Hydraulics and Pneumatics, vol. 31, No. 3, Mar. 1978, Cleveland, USA, pp. 10-21.
ARGO GmbH fur Fluidtechnik
Drodge Joseph W.
Hoppin Ralph F.
Lipsitz Barry R.
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