Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1986-12-23
1988-10-25
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
91 33, 91452, 251 3002, 251 3005, 251 44, F16K 31122, F16K 3102
Patent
active
047798360
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve arrangement intended to be disposed in a line with pressure medium which is used as supply line as well as return line, e.g. in a line of pressure medium connecting a pressure source, e.g. a pump, with a consuming device, e.g. a single-acting cylinder, another piston-cylinder arrangement with return strokes through spring force or another external or internal returning force or tank for control of the flow of pressure medium through said line with pressure medium, said valve arrangement comprising a valve body with a first valve port connected to the line with pressure medium and a second valve port connected to said line with the pressure medium, said valve ports, alternately, serving as input and output, and a valve cone arranged in the valve body and movable from a closed position, in which its closes the two valve ports, to an open position in which it connects the two valve ports with each other, the valve cone in its closed position being under the influence of a holding force acting on the side of the valve cone facing away from the valve ports, said holding force being greater than the force acting on the pressure medium side of the valve cone and dependent on the medium pressure in the valve port operating as input.
E.g. at single-acting hydraulic cylinders with return strokes provided by a spring or a load or the like acting on the cylinder or its piston rod the supply line for the pressure medium from the pressure source, as is well-known, is also used as return line for the pressure medium from the cylinder to a tank. There are different kinds of control valves for controlling the flow of pressure medium in such a line which valves permit a flow in one direction only and, for that reason, two such control valves shunted or connected in parallel are required in order that it might be possible to control the flow in one direction or the other in such a line with pressure medium serving as supply as well as return line.
It is therefore the object of this invention to provide a valve arrangement so constituted that it enables control of the flow of pressure medium in one direction or the other in a line with pressure medium serving as supply as well as return line between a pressure source and a consuming device and which, moreover, shall have a simple and reliable function and, further, should enable control of the amount of pressure medium per time unit.
This object of the invention is achieved by a valve arrangement according to the invention having the characteristic features defined in the claims.
The invention is described in the following in greater detail with reference to the enclosed drawings in which FIG. 1 shows schematically and in the form of a block diagram a valve arrangement according to the invention arranged in a line with pressure medium between pressure source and a consuming device and
FIG. 2 shows schematically as well as in the form of blocks also a somewhat modified design of the valve arrangement according to FIG. 1.
The valve arrangement of the invention comprises a valve body 1 with a first valve port 2 and a second valve port which serve alternately as input and output. In the example shown in the drawing the valve port 2 is connected through a line 7 with pressure medium to a pressure source 4 in the form of a pump and also to a tank 5 for pressure medium via an electrically controlled discharge and overflow unit 6 while the valve port 3 is connected through a line 8 for pressure medium to a consuming device 9 which in the example shown in FIG. 1 consists of a telescopic cylinder used as dumping cylinder, the return strokes of which are obtained by an externally acting load marked by the arrow 10 in FIG. 1. In the example shown said discharge and overflow unit 6 comprises an overflow valve 11 and a discharge valve 12 of a kind known per se, the object of the latter being to enable pumping around pressure medium from pump to tank in its open position shown in FIG. 1 and to prevent such a working in its second closed position. The overfl
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Bahco Hydrauto AB
Walton George L.
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