DE2311408A1 - VALVE - Google Patents

Description

Valve The J! .Yfindun concerns a valve with three or four connections according to patent (Yatent application P 22 57 213.0), in which the anchor due to the effect a first spring is held in an initial position in which the first and the second terminal are connected to each other, and the third terminal by a first connected to the anchor closure body is completed, in which the Armature movement against the first spring by applying the armature to one connected piston is effected with pressure medium, in which continues in a second Armature end position, the second connection closed and the third connection with one Another connection (one or four) is in connection, at which the two Closure body relative to the armature in its axial direction and in the opposite direction on the valve seats acting spring forces are movable, the armature for the two closure bodies Has one entrainment each, of which one each shortly before reaching the anchor end position with. the locking body engages and the closure body lifts off the valve seat and in which the armature is in an intermediate position has, in which both closure bodies sit on the valve seats0 The essence the invention is seen in the fact that in the valve an electrical or electronic Switch is provided, which is operated when the intermediate position is reached and that its switching signal switching means for interrupting the pressure medium supply can be supplied is.

In the valve on which the main patent is based, the control force for reversing by means of a magnetic winding or by means of a pressure medium take place.

There is a further spring force in the intermediate position effective, which is opposite to the armature movement and the control force must be in be adjustable in some way to an intermediate value, so that the additional Spring force is not overcome by it.

However, all other features of the main patent are also in the present one Invention present. In addition to the same task, namely creating a simple one Three-Sturon valve, the invention is based on the same solution principle.

Preferably, only one as is used to control the piston displacement Three-way solenoid valve designed pilot valve used, which when a switching signal for the second end position is controlled directly and thus the piston for his Persist lit pressure medium applied and that to control the A switching signal sent via a gate is applied to the intermediate position, this gate becomes impermeable when the switch in the valve is actuated. Since that then falling pilot valve releases pressure medium, the armature wants to return to the starting position go back. However, he will be remedied by the renewed pressure supply via the immediately re-energized pilot valve prevented.

Instead of a three-level valve, a vent valve can also be used conceivable that releases the pressure medium and thus the armature in its starting position brings when there is no control signal.

Eggs is also a normally closed inlet valve (Two-way valve) necessary. You can also use a three position solenoid valve accordingly the main patent to control the valve according to the invention use what the Brings the advantage of low air consumption.

Hicr activating the switch releases the control pressure from being kept constant the end.

A tapitive or inductive proximity switch, for example, can be used as the switch serve, e.g. also a reed contact or a sagnetteld-sensitive semiconductor, which is operated by a magnet attached to the armature.

The valve according to the invention can be used, for example, to control the pressure of a truck, with the signals of a blocking regulator the pilot valve or valves drive. You can use compressed air and hydraulic fluid to control the valve and the valve itself can control compressed air and hydraulic fluid.

An exemplary embodiment of the invention is shown in the drawing. The valve body is marked with 1, the armature The plunger is designated by 2. on the two closure bodies 3 and 4 are slidably mounted in it, the area the displaceability through the two drivers firmly connected to the plunger 2 5 and 6 is limited.

The spring 7, which is effective between the closure bodies 3 and 4, keeps the closure body 3 and 4 at a distance.

The illustrated starting position of the armature is created by the spring 8 caused, which acts on the piston 9 in the control cylinder 10 and moves it to the right pushes. In this starting position, the closure body 4 sits on the valve seat 11 on; the closure body 4 is opposite the anchor plunger by the distance 12 shifted to the left. In this position the opening 13 is with the opening 14 connected. In contrast, the connection of the valve opening 15 with the valve opening 14 interrupted by the closure body 4.

If the valve is now to be controlled into its intermediate position, then so a control signal is fed to terminal 16. This arrives via the AND gate 17, the ODÆR gate, 8, the amplifier 19 for the winding 20 of a pilot valve 21, so that the dlocking agent flow (e.g.

Compressed air) releases from the pressure medium source 22 to the control cylinder. The piston and thus also the armature tappet are displaced in the process. Moved here also the closure body 3 (by the spring force) to the left until it is on his Valve seat 23 is seated. Shortly thereafter, the switch 24 is actuated, which the gate 17 blocks and thus de-energizes valve 21. Pressure medium can thus be fed via the valve 21 escape and the piston 9 begins to move to the right. But before the Closure body 3 lifts off, the switch changes its signal and the valve 21 changes will energized again, etc. In this intermediate position of the valve, the closure body 4 has not yet been lifted off the seat 11, i.e. there is no connection between the three openings 13, 14 and 15.

If the valve is to be brought into the other end position, this takes place the control at terminal 25. There is no interruption when reaching the Intermediate position, rather the armature plunger is moved beyond its intermediate position. In the process, the closure body 4 is lifted off the seat 11. The end position is through the Force of the spring 8 or a special stop, not shown, is determined. To At the end of the control signal, the valve returns to its starting position.

- patent claims -

Claims (4)

Claims Valve with three or four connections, according to the patent ..................... (patent application P 22 57 213.0), in which the anchor due to the action of a first spring is held in an initial position in which the first and second terminals are connected to each other, and the third terminal is closed by a first closure body connected to the anchor, in which the armature movement against the first spring by applying a with the armature connected piston is effected with pressure medium, in which continues in a second anchor end position, the second connection is closed and the third connection is connected to another port (one or four) that still has the two closure bodies relative to the armature in its axial direction and opposite are movable by spring forces acting in the direction of the valve seats, wherein the anchor for the two closure bodies each has one entrainment, von.denen each one in engagement with the closure body shortly before reaching the anchor end position occurs and lifts the closure body from the valve seat and in which the armature has an intermediate position has, in which both closure bodies sit on the valve seats, thereby gekennzoichnetq that a particular electrical or electronic switch is provided in the valve which is actuated when the intermediate position is reached and that its switching signal Schaltitteh sur interruption of the pressure medium supply can be supplied. 2. Valve according to claim 1, characterized in that for control the piston shift in the pressure medium supply switched on a three-way solenoid valve is, and that the control signal for the second valve end division of the winding of the valve directly and the control signal for the intermediate position via a gate can be fed, which is impermeable when the switch is operated. 3, valve according to claim 1, characterized in that in the pressure medium supply a three-position valve is switched on, the line in its intermediate position is interrupted (pressure constant) and that the Schater signal the setting of the Causes valve to this position. 4. Valve according to one of claims 1 to 3, characterized in that that the switch is a proximity switch. L e r s e i t e