DE2541445A1 - Valve for pneumatically driven systems - has plunger moving axially in valve housing with ventilation to atmosphere between plunger and housing - Google Patents

Abstract

The valve is for pneumatically driven systems where diverse switching combinations are required and where especially small nominal withs must be multiply swtched. A plunger (3) with flat faces on the long sides can move axially in a valve housing (2). In the plunger switch positions, connections can be produced of high switch accuracy by means of plunger holes (4, 5). When there is failure or defect of a sealing element (10) there can be no unobserved connection and mixing of the compressed air in two or more connectors (6, 7, 8, 9). This is because there is capability of ventilation to atmosphere between the plunger (3) and valve housing (2) outside the sealing element (10).

Description

Directional valve for pneumatically operated systems

The invention relates to a directional control valve for pneumatically operated Systems in which various switch combinations are required and in which In particular, small nominal widths have to be interconnected in a variety of ways.

With such directional control valves, it is necessary to use different switching combinations to be able to produce and for this purpose various connections as required to connect with each other.

It is known to meet these requirements directional control valves in To use the form of relatively expensive to manufacture rotary slide valves.

Furthermore, directional control valves are already in the form of a wide variety of types Piston slide valves related, in which slide with several longitudinally displaceable rigidly connected pistons are arranged, which relatively low switching combination possibilities Offer. Another disadvantage of these directional control valves is that if one of them becomes defective Seal an overflow of air from one connection to the other is not excluded can be.

The invention is based on the object of creating a directional control valve which allows a variety of switching combinations with a simple structure and is also easy to use and safe to use.

According to the invention, this object is achieved in that in a valve housing a slide provided with flat surfaces on the longitudinal sides is arranged to be axially displaceable and in the respective switch positions of the slide by means of ski holes corresponding connections of the connections as well as any other connections of any existing connections through corresponding differently positioned slide bores can be produced with high switching accuracy, such that in the event of failure or If a sealing element becomes defective, no unintentional connection of connections and mixing of the compressed air occurs in two or more ports because between Slide and valve housing outside of the sealing elements have a ventilation option to the atmosphere is provided.

Expedient refinements of the invention are set out in the subclaims 2 to 5 can be found.

The invention extends to all shown, described and claimed features.

The advantages achieved with the invention exist in particular in this, that the slate can be switched in the axial direction by means of shift pistons, that the Valve housing of the directional control valve has a short, compact design, an economical, inexpensive production is to be drawn, and that with a reliable function a very long service life is given.

An exemplary embodiment of the invention is shown in the drawing and is described in more detail below: In the valve housing 2 of the directional control valve 1, a slide 3 of any square shape is arranged axially displaceably.

According to ZEichnerischor's illustration, the slide 3 has slide bores 4 and 5, which run transversely through the interior of the slide.

The slide bores 4 and 5 connect corresponding connections 6, 7 and 8, 9, which are arranged outside the valve housing and the respective Serve screw connection of the directional control valve in a pneumatically operated system.

A sealing element 10 is arranged within each of the connections, which is pressed sealingly against the slide 3 by a spring washer 12.

The purpose of sealing the lateral guide space is also respectively an O-ring 11 is placed around the sealing element 10.

If the slide 3 is now axially displaced from the position shown, so the connected connections 6, 7 and 8, 9 are separated from each other.

It can now by means of slide bores, not shown in a or several other levels across the slide any further connections of the connections shown are made.

In this way, for example, connection 7 with connection Connect 8 and connection 6 with connection 9 in the same way as the switch combinations connections 7 and 9 and connections 6 and 8 can be produced.

In the latter switching positions there are therefore only the different ones Slide bores, so to speak, arranged in several levels in the slide.

Such a multi-storey arrangement can also be used at the same time the connections are used if their number in one level is in connection with the respective valve bores an insufficient number of switching combinations results.

Since the slide 3 and similarly the Ventilgehäusc any Multipurpose form can have, there is the possibility with the shortest possible length of the invention Directional control valve 1 .n different levels transverse to the longitudinal axis a relatively large number of connections to be arranged, which correspond to the different slide bores in Verechiadenen levels across the slide 3 in each switch position of the slide can be interconnected differently.

The principle, in different levels of the valve housing 2 as well as the Slide 3 any number of connections and slide holes to be arranged, the sliding connection points between connections and slide bores, i.e. valve housing 2 and slide 3 with special, maximally functionally reliable and adjustable sealing elements are provided for the purpose of extremely reliable function, enables a variety of switching combinations under the individual levels with their connections or slide bores.

Due to the adjustability of the spring washers on the slide pressed sealing elements 10 are malfunctions due to insufficient sealing on the Connection points between the inner housing or each sealing element 10 itself and the slide 3 practically excluded, as long-term tests have shown.

In addition, the sealing elements are in one with increasing air pressure Connection connection, as it were, is increasingly pressed against the slide 3, which just started in the seal these critical points between Slide 3 and sealing elements 10 at the same time an increasing air pressure account is worn and consequently leaks are avoided even at higher pressures.

In the exceptional and highly unlikely event that, possibly due to a material foal, but once the sealing by means of a sealing element 10 on a longitudinal surface of the slide 3 is insufficient and Compressed air can escape into the housing between sealing element 10 and slide 3, this does not affect any other connections incorrectly or become inoperative set, since all other connections and slide holes also have a JO special sealing element 10 are provided. A simultaneous failure of two or several sealing elements 10 appears completely excluded.

Compressed air, which between slide 3 and the interior of the valve housing 2 should escape due to a defective sealing element, it can be on the front sides of the valve housing flow freely into the atmosphere.

A failure of a sealing element does not result in an inoperative condition of the entire erfindungsgeinäßon Wegeventile8 out, as it is with known Ungeventilen may be the case.

Claims (5)

Claims 1. Directional control valve for pneumatically operated systems, where various switching combinations are required and where in particular Small nominal sizes can be interconnected in a variety of ways, so Pj e k 8 fl fl z 8 i c h n e t, ca in a valve housing (2) with flat surfaces on the Long sides provided Sziber (3) is arranged axially displaceable and in the respective switching positions of the slide (3) by means of slide bores (4 and 5) corresponding connections of the connections (6, 7 and 8, 9) as well as any other Connections from the same existing connections through corresponding ones, different know stored slide bores with high switching accuracy, in such a way that if a sealing element (10) fails or is defective, no unintentional Connection of connections and mixing of the compressed air in two or more connections (6, 7, ß, 9) 3 occurs because between slide (3) and valve housing (2) outside of the sealing elements (10) a possibility of venting towards the atmosphere is. 2. Directional valve according to claim 1, characterized in that the slide (3) can have a cross-section of any polygonal shape. 3. Directional valve according to claim 1, characterized in that over the Slide bores (4 and 5) also have additional slide bores in the Slide (3) in different directions across the slide, i.e. in different, transverse to the longitudinal axis of the directional control valve (1) lying planes over the length of the slide can be arranged distributed as required. 4. Directional valve according to claim 1, characterized in that analogously to connections corresponding to all possible slide bores of any number and arrangement (G,?, 0, 9) can also be arranged in several levels and in a radial pattern on the valve housing can. 5. Directional valve according to claim 1, characterized in that the sealing elements (10) are pressed by spring washers (12) against the slide (3) and a large one Offer adjustment possibility! as well as increasing air pressure in proportion to the latter must also be pressed against the slide (3).