A flow control proportional valve comprises a valve body (1) and a valve spool.
The first spring exerts a downward pretightening force on the valve spool by the diaphragm and the second spring exerts an upward pretightening force on the valve spool.
The valve spool (32) includes a valve port (36) defining an effective area which establishes the amount of air flow through the valve body (22) between the air inlet (28) and outlet (30) thereof.
A pilot- operated main valve spool supported by the body is movably disposed in the bore for opening and closing ports formed in the body.
One of the disks acts as a valve closing disk (14) and the other as a valve opening disk (12), and the valve opening disk (12) is allocated a supporting surface which is separated from the flooding chamber (7).
The body (10) is preferably formed as a valve slide for direct control of a valve.
The valve slide (20) can be displaced by electro-hydraulic devices.
A valve slide (20) in a valve housing (1) can slide into a forwards, backwards or neutral position.
The valve slide (10) itself has a central axial bore (19) in which the valve plunger (13) is received in a radially guided manner.
The direction of displacement of the valve slide (1) can be electrically reversed, thereby resulting in a comparatively simple mechanical layout for the valve for variably controlling the characteristic line of the valve.
In order to ensure that the valve slide will return to a neutral position after being moved away from its neutral position, there is provided a spring system (5) which forms a part of the operating circuit (24).
A control bush (7) is guided in an axial drilling (6) in the valve slide (4) to rotate through a limited angle.
A valve shuttle is disposed in a hole downstream of the lubricant discharge opening and comprises a recess for receiving a small quantity of oil.
In order to compensate pressure, highly pressurized pressure medium can be conducted between the bush (5) and the valve slide (4) in an area in which high pressure is applied outside of the bush (5).
The position of an operating lever and/or a valve slide is indicated by breaking and making an output operating circuit (24) having electrical connector means (18, 19).
The invention relates to a valve slide (10) which is especially used in directional valves for controlling pressure medium connections between pressure chambers.