Fluid handling – Systems – Supply and exhaust
Patent
1983-05-27
1985-08-20
Camby, John J.
Fluid handling
Systems
Supply and exhaust
1376256, F17D 120
Patent
active
045358095
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve means for controlling or adjusting a linear or rotary hydraulic motor, which is connected via the valve means to a pump acting as pressure medium source and directly or via the valve means to a tank.
Known valve means of this kind and for this purpose comprise at least one pressure-controlled valve, the control pressure of which is adjusted by means of a pilot control valve. These known pressure-controlled valves normally comprise a valve slide, which adjusts both the supply of pressure medium to the motor and the return flow from the same. These known valves, however, do not always meet the demand in question, owing to internal leakage which implies, for example, that a linear motor as a double-acting hydraulic cylinder is not actuated to carry out the desired movements.
The object of the present invention, therefore, is to eliminate these disadvantages and to provide a valve means, which is flow-controlled and renders possible pressure compensation and parallel and/or series connection of several functions, as for example load sensing, pressure compensation and pressure reduction.
This object is achieved in that the valve means according to the present invention has been given the characterizing features defined in the attached claims.
The invention is described in greater detail in the following, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a section through a basic design of a valve means according to the invention for controlling a double-acting hydraulic cylinder,
FIG. 2 is a hydraulic diagram of the embodiment shown in FIG. 1,
FIG. 3 is a schematic view of a section of a first embodiment of a seat valve with associated pilot valve comprised in the valve means,
FIG. 4 is a schematic view of a section of a second embodiment of a seat valve with associated pilot valve comprised in the valve means,
FIG. 5 is a schematic view of a valve means according to FIG. 1 provided with load-sensing,
FIG. 6 is a hydraulic diagram of the embodiment shown in FIG. 5,
FIG. 7 is a schematic view of a valve means according to FIG. 1 provided with pressure reducing function in the motor ports,
FIG. 8 is a hydraulic diagram of the embodiment shown in FIG. 7,
FIG. 9 is a schematic view of a valve means according to FIG. 1 with pressure compensation,
FIG. 10 is a hydraulic diagram of the pressure compensated embodiment shown in FIG. 9.
FIG. 11 is a schematic view of a valve means according to the invention with load sensing as well as pressure reduction and pressure compensation,
FIG. 12 is a schematic view of a hydraulic diagram of the valve means shown in FIG. 11,
FIG. 13 is a section through a normally compensating pressure compensator,
FIG. 14 is a section through an over-compensating pressure compensator,
FIG. 15 shows a sub-compensating pressure compensator,
FIG. 16 is a side view, parly in section, of a valve package consisting of several valve means according to the invention,
FIG. 17 is a section through the valve package substantially along the line XVII--XVII in FIG. 16,
FIG. 18 is a schematic view of a valve means according to the invention for controlling a rotary motor,
FIG. 19 is a schematic section of a modified embodiment with a pressure compensator in direct connection to a seat valve,
FIG. 20 shows schematically a modified embodiment of the valve means in FIG. 11 with load sensing, pressure limitation and compensation and with floating position,
FIGS. 21 and 22 are enlarged sections of a floating position device according to FIG. 20 in a first and, respectively, second position, FIG. 23 shows schematically a modified embodiment of a seat valve in the valve means, and
FIG. 24 shows a hydraulic layout of an embodiment of the present valve means with only two pilot valves for controlling all main valves of the valve means.
The valve means according to this invention is intended to control or adjust a hydraulic motor, which in the drawings generally is designated by 1, irrespective of whether it is a single- or double-acting linear motor
REFERENCES:
patent: Re29292 (1977-07-01), Tennis
patent: 3100503 (1963-08-01), Tennis
patent: 3730219 (1973-05-01), Tennis
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