DK154170B

DK154170B - Spool valve assembly

Info

Publication number: DK154170B
Application number: DK530883A
Authority: DK
Inventors: Hans Christian Petersen; Erik Kyster
Original assignee: Danfoss As
Priority date: 1982-11-24
Filing date: 1983-11-21
Publication date: 1988-10-17
Also published as: DK154170C; DK530883A; DK530883D0; DE3243403A1; DE3243403C2

Description

Opfindelsen vedrører en gliderventilindretning med et hus og en to parallelle flader udvisende glider i et to parallelle flader udvisende kammer i huset, ved hvilket to tilgrænsende flader af glider og hus indeholder som ventil samvirkende styreåbninger og mellem sig danner en op til en højtrykzone grænsende første drosselspalte, og hvor der mellem de andre tilgrænsende flader af glider og hus er dannet en mellem-trykzone, som er koblet ind mellem den første drosselspalte og en sig modsat denne ændrende, til lavtryksiden førende anden drosselspalte.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a sliding valve assembly with a housing and two parallel faces showing slides in a two parallel faces showing chamber in the housing, wherein two adjacent faces of slides and housing contain, as valve, cooperating control openings and between them form a first throttle gap adjacent to a high pressure zone. and where an intermediate pressure zone is formed between the other adjacent surfaces of slides and housing, which is coupled between the first throttle slot and one opposite to this changing, leading to the second throttle leading to the low pressure side.

En kendt giiderventil indretning af denne art (DE-AS 25 44 849) tjener som fordelerventil for en radialstempelmaskine. En drejeglider har form som en ringskive med blindhuller. Disse forbinder styreåbninger, som hver fører til en radialcylinder, skiftevis med til- og afløbsåbninger, som befinder sig på den samme kredsbane. Højtrykzonen er dannet af en ringnot på en husflade, den første drosselspalte mellem denne ringnot og omkredsen på ringskiven, mellemtrykzo-nen af den totale over for liggende flade af ringskiven og den anden drosselspalte af et ringområde, som ligger i det samme plan som den første drosselspalte og omgiver en centr isk afløbsboring. Da de to drosselspalters drosselmodstand ændrer sig i modsat retning ved en forskydning af ringskiven, stiger mellemtrykket, når drejeglideren løftes af styreåbningerne, således at den tilnærmelsesvis beholder sin udgangsposition, og der ved .indstillingen praktisk talt ingen friktionskræfter skal overvindes.A known guide valve device of this kind (DE-AS 25 44 849) serves as a distributor valve for a radial piston machine. A swivel slider has the shape of a ring disc with blind holes. These connect control openings, each leading to a radial cylinder, alternately with inlet and outlet openings located on the same circuit path. The high pressure zone is formed by a ring groove on a housing surface, the first throttle gap between that ring groove and the circumference of the ring washer, the intermediate pressure zone of the total opposite surface of the ring washer, and the second throttle gap of a ring area lying in the same plane as the first chute and surrounds a central drainage bore. As the throttle resistance of the two throttle slides changes in the opposite direction by a displacement of the annular disc, the intermediate pressure increases as the swivel slider is lifted by the guide openings so that it retains its initial position and virtually no frictional forces are to be overcome at the setting.

Ved disse og andre giiderventilindretninger er gliderens ak-sialbelastning, som afhænger af de trykførende styreåbningers position, dog ofte usymmetrisk. Dette medfører en ensidig belastning af glideren og derfor på trods af tilstedeværelsen af mellemtrykzonen kipning og klemning.However, in these and other guiding valve devices, the axial load of the slider, which depends on the position of the pressure-guiding control openings, is often asymmetrical. This results in a unilateral load on the slider and therefore despite the presence of the intermediate pressure zone tilting and squeezing.

Formålet med opfindelsen er at angive en gliderventilindret- ning af den i indledningen beskrevne art, hvor man forhindrer en klemning ved asymmetrisk belastning af glideren.The object of the invention is to provide a sliding valve arrangement of the kind described in the preamble, whereby a clamping is prevented by asymmetrical loading of the slider.

Opgaven løses ifølge opfindelsen ved, at mellemtrykzonen er opdelt i mindst to fra hinanden adskilte segmenter, hvis fladetyngdepunkter ligger unden for midten af glideren, og at hvert segment mindst samvirker med en første og en anden drosselspalte, som svarer til segmenternes position.The task is solved according to the invention in that the intermediate pressure zone is divided into at least two spaced apart segments whose flat center of gravity lies below the center of the slider and that each segment at least interacts with a first and a second throttle slot corresponding to the position of the segments.

Ved denne konstruktion kan der dannes forskellige mellemtryk i mellemtrykzonens enkelte segmenter. Ved kipning af glideren stiger mellemtrykket i et segment, mens det falder i det andet segment. Herved modvirkes gliderens tilbøjelighed til at kippe, og selv ved asymmetrisk belastning sikres en praktisk talt friktionsfri indstilling af det over styreåbningerne tilførte tryk.In this construction, different intermediate pressures can be formed in the individual segments of the intermediate pressure zone. When tilting the slider, the intermediate pressure in one segment increases while it decreases in the other segment. This prevents the tendency of the slider to tilt, and even under asymmetric load, a virtually frictionless adjustment of the pressure applied over the guide openings is ensured.

På hensigtsmæssig vis ligger de første drosselspalter aksi-alt over for de tilhørende segmenter og er forbundet med dem over en aksialkanal. Dette resulterer i en særdeles enkel udførelsesform.Conveniently, the first throttle slots are axially facing the associated segments and are connected to them over an axial channel. This results in a very simple embodiment.

De andre drosselspalter slutter mod de tilhørende segmenter. Dette medfører, at mellemtrykket forhøjes umiddelbart dér, hvor den anden drosselspalte formindskes.The other chute slots end toward the associated segments. This means that the intermediate pressure is increased immediately where the second choke gap is reduced.

Ved en indretning med drejelig glider bør mellemtrykzonen være dannet af mindst tre kredssegmenter.. På denne måde kan man modvirke en ekscentrisk belastning af glideren, ligegyldigt hvilken vinkelposition denne belastning har.In the case of a swivel slider, the intermediate pressure zone should be formed by at least three circular segments. In this way, an eccentric load of the slider can be countered, regardless of the angular position of that load.

Ved en indretning med lineært bevægelig firkantglider skal mellemtrykzonen være dannet af fire, hver med et hjørne samvirkende segmenter. Dette tillader ligeledes, at man kan udligne gliderens asymmetriske belastninger.In a device with linearly moving square slides, the intermediate pressure zone must be formed of four, each with a corner cooperating segments. This also allows you to offset the asymmetric loads of the slider.

Ved en foretrukket udførelsesform er højtrykzonen dannet af en ringnot, som har udvidelser i aksialkanalernes område, og at den første drosselspalte er begrænset af ringflader mellem højtrykzonen og aksialkanalernes mundinger. På denne måde fremkommer der en defineret højtrykzone og en nøjagtig position af den første drosselspalte med hensyn til segmenterne.In a preferred embodiment, the high pressure zone is formed by a ring groove which has extensions in the area of the axial channels and that the first choke gap is limited by annular surfaces between the high pressure zone and the mouths of the axial channels. In this way, a defined high pressure zone and an exact position of the first throttle gap with respect to the segments are obtained.

Ved en alternativ løsning er der sørget for, at der symmetrisk omkring gliderens længde- og tværakse er anbragt fire med hver en aksialkanal forbundne noter, og at de første drosselspalter er begrænset af afsnit mellem disse noter og højtrykzonen. Også med denne indretning opnår man, at de første drosselspalter samvirker nøjagtigt med segmenterne.In an alternative solution, it is arranged that four longitudinal and interconnecting grooves are symmetrically arranged around the longitudinal and transverse axes of the slider and that the first choke slots are limited by sections between these notes and the high pressure zone. Also with this arrangement, the first choking slots are obtained to interact exactly with the segments.

Endvidere byder det på fordele, hvis rummet uden for glideren er forbundet med lavtryksiden, og at de andre drosselspalter er begrænset af et kantafsnit. De andre drosselspalter har så en forholdsvis stor afstand fra gliderens midterakse, således at de ændres tilsvarende kraftigt ved kipbevægelser.Furthermore, it offers advantages if the space outside the slider is connected to the low pressure side and that the other chute slots are limited by an edge section. The other throttle slots then have a relatively large distance from the center axis of the slider, so that they are altered equally sharply by tilting movements.

Herved kan kredssegmenterne være begrænset af radialafsnit, som har en radialnot, som fra kanten fører til en centrisk, med lavtryksiden forbundet kanal. Derfor kan der anvendes den totale omkreds på kredssegmenterne for den tilhørende anden drosselspalte. Desuden er det tilstrækkeligt med en eneste kanal i midten for at etablere forbindelsen til lavtryksiden.Hereby, the circuit segments may be limited by radial sections having a radial groove leading from a edge to a centric, low pressure side channel. Therefore, the total circumference can be applied to the circuit segments of the associated second chute slot. Furthermore, a single channel in the center is sufficient to establish the connection to the low pressure side.

Det er desuden gunstigt, hvis glideren er forbundet med et udvendigt aktiveringsorgan over en kobling, som tillader en ledbevægelse, og som forhindrer en kraftoverførelse vinkelret på giiderfladerne. På denne måde sikres det, at der ikke overføres kræfter over aktiveringsorganet til glideren, som kunne føre til en klemning eller kunne genere mellemtrykzo-nens kompensationsvirkning.In addition, it is advantageous if the slider is connected to an external actuator over a coupling which permits a joint movement and which prevents a force transfer perpendicular to the guide surfaces. In this way, it is ensured that no forces are transferred across the actuator to the slider, which could lead to a pinch or could interfere with the compensating effect of the intermediate zone.

Med særlig fordel er gliderens aksiale spillerum så lille, at styreåbningerne på lavtryksiden i styreåbningernes spærrestilling er tætnet i forhold til de andre styreåbninger, selv ved manglende tryk i højtryk- og mellemtrykzonen. I praksis er en sådan tætning tilstrækkelig til, at arbejdsmo-tor og/eller målemotor ikke mister væske i nævneværdig grad. Fortrinsvis skal det aksiale spillerum kun udgøre ca. 5 -50 mikrometer, fortrinsvis ca. 10 mikrometer. På trods af det så lille spillerum kan glideren indstilles praktisk talt friktionsfrit på grund af den krævede trykbalancering.With particular advantage, the axial clearance of the slider is so small that the control openings on the low pressure side in the locking position of the control openings are sealed relative to the other control openings, even in the absence of pressure in the high pressure and medium pressure zone. In practice, such a seal is sufficient that the working motor and / or measuring motor do not lose fluid to any appreciable extent. Preferably, the axial clearance should only be approx. 5 to 50 micrometers, preferably approx. 10 microns. Despite the small amount of clearance, the slider can be adjusted virtually friction-free due to the required pressure balancing.

Anvendelsen som retningsventil er anbefalelsesværdig ved en hydrostatisk styreindretning med målemotor, ved hvilken motorhuset danner glideren, og en som aktiveringsorgan tjenende styreaksel er forbundet med den i forhold til motorhuset drejelige motordel. Herved opnår man ved en styreindretning, at retningsventilen kun har styreåbninger på den ene side, og at der derfor kan anvendes en glider med trykbalancering. Dette er særdeles vigtigt for en sådan styreindretning, fordi gliderens indstilling fra neutralstillingen skal foretages med håndkraft, og, hvis friktionen skal overvindes i begyndelsen, der finder en efterfølgende overstyring sted.The use as a directional valve is recommended for a hydrostatic control device with measuring motor, at which the motor housing forms the slider and a control shaft serving as an actuating member is connected to the motor part rotatable relative to the motor housing. In this way, it is achieved by a control device that the directional valve has only control openings on one side and that therefore a slider with pressure balancing can be used. This is extremely important for such a control device because the slider's adjustment from the neutral position must be done by hand and, if the friction is to be overcome initially, a subsequent override takes place.

Opfindelsen beskrives nedenfor nærmere ved hjælp af et på tegningen vist, foretrukket udførelseseksempel, der viser i, fig. 1 et længdesnit gennem en hydrostatisk styreindretning med en retningsventil svarende til gliderventil indretningen ifølge opfindelsen, fig. 2 en forenklet tegning af gliderventilindretningen i fig. 1, fig. 3 et billede nedefra af glideren i fig. 2, fig. 4 et billede oppefra af glideren i fig. 2, fig. 5 et snit gennem et andet udførelseseksempel af en gliderventilindretning ifølge opfindelsen, fig. 6 et snit langs med linien VI-VI i fig. 5, fig. 7 et snit langs med linien VII-VII i fig. 5 og fig. 8 et diagram for ventilindretningen i fig. 5-7.The invention is further described below by means of a preferred embodiment shown in the drawing, which shows in fig. 1 is a longitudinal section through a hydrostatic control device with a directional valve corresponding to the sliding valve device according to the invention; FIG. 2 is a simplified drawing of the sliding valve assembly of FIG. 1, FIG. 3 is a bottom view of the slider of FIG. 2, FIG. 4 is a top view of the slider of FIG. 2, FIG. 5 is a section through another embodiment of a sliding valve assembly according to the invention; 6 is a section along line VI-VI of FIG. 5, FIG. 7 is a section along the line VII-VII of FIG. 5 and FIG. 8 is a diagram of the valve assembly of FIG. 5-7.

Ved en styreindretning i fig. 1 er der anbragt et skålformet udvendigt hus 1, som er lukket i den åbne ende af en tilslutningsplade 2. Denne har en med en pumpe P forbundet pumpetilslutning 3, en med beholderen T forbundet beholdertilslutning 4 og to arbejdsmotor-tilslutninger, hvoraf der kun er vist tilslutningen 5, og som er forbundet med tilslutningerne S1 og S2 for en styre-arbejdsmotor 6. I tilslutningspladen er der desuden anbragt fordelerkanaler 7, som forbinder de enkelte tilslutninger med styreåbningerne 8 i endefladen 9.In a control device of FIG. 1, a bowl-shaped exterior housing 1 is provided which is closed at the open end of a connection plate 2. It has one pump connection 3 connected to a pump P, one container connection 4 connected to the container T and two working motor connections, of which there are only shown in connection 5 and connected to the connections S1 and S2 for a control-working motor 6. Furthermore, in the connection plate there are distributor channels 7 which connect the individual connections to the control openings 8 in the end surface 9.

En drejeglider 10 har en første flade 11, som har styreåbninger 12 og sammen med fladen 9 danner en retningsventil 50. Glideren 10 dannes af motorhuset for en målemotor 13, som har en indvendig fortandet tandring 14 og et drejende og kredsende, udvendigt fortandet tandhjul 15, hvorimellem der dannes fortrængningskamre 16. Den som motorhus udformede glider 10 har foruden tandringen 13 en endevæg 17 og en ventilplade 18, som holdes sammen af skruer 19. Mellem ventilpladen 18 og tandhjulet 15 er der udformet en i og for sig kendt fordelerventil 20. Tandhjulet 15 står over en ledaksel 21 i forbindelse med en styreaksel 22. Den sidstnævnte er lejret i det udvendige hus 1 over et aksialleje 23. Opbygningen af den hidtidig beskrevne styreindretning fremgår i enkeltheder af den parallelt indleverede patentanmeldelse "Hydrostatisk styreindretning, især til køretøjer", patentansøgning nr. 5305/83.A pivot slider 10 has a first surface 11 which has guide openings 12 and together with the surface 9 forms a directional valve 50. The slider 10 is formed by the motor housing of a measuring motor 13, which has an internally toothed gear ring 14 and a rotating and circumferentially external toothed gear 15. In between, displacement chambers 16. Formed as motor housing slides 10, in addition to the tooth ring 13, has an end wall 17 and a valve plate 18 which are held together by screws 19. Between the valve plate 18 and the sprocket 15, a distribution valve 20 is known per se. The sprocket 15 faces a pivot shaft 21 in connection with a steering shaft 22. The latter is mounted in the outer housing 1 over an axial bearing 23. The structure of the previously described steering device is described in detail in the parallel patent application "Hydrostatic steering device, especially for vehicles". , Patent Application No. 5305/83.

Som det fremgår i forbindelse med fig. 2-4, bærer glideren 10 en ringnot på fladen 11, og ringnoten danner en højtrykzone 24. Ringnoten har udvidelser 25, hvori der befinder sig af en ringflade 26 omgivne mundinger 27 af aksialkanaler 28. Hver ringflade 26 danner en første drosselspalte 29 sammen med tilslutningspladens 2 flade 9. På den over for liggende side dannes der mellem gliderens 10 flade 30 og fladen 31 på det udvendige hus 1 en mellemtrykzone 32, som har tre kredssegmenter 34, 35 og 36 i form af fordybninger i fladen 30. Der udmunder en aksialkanal 28 i hvert kredssegment. Hvert kredssegment er begrænset af et udvendigt randafsnit 37 og to radialafsnit 38. I radialafsnittene er der radialnoter 39, som fører til en kanal 40 i midten. Som følge heraf dannes der en anden drosselspalte 41 mellem fladen 31 og de nævnte afsnit 37, 38. Det udvendige rum 42 er forbundet med beholderen T over radialnoterne 39 og kanalen 40 i midten.As can be seen from FIG. 2-4, the slider 10 carries a ring groove on the surface 11 and the ring groove forms a high-pressure zone 24. The ring groove has extensions 25 in which are the mouths 27 of axial channels 28 surrounded by a ring surface 26. Each ring surface 26 forms a first chute slot 29 together with surface 9 of the connecting plate 2. On the opposite side, between the surface 30 of the slider 10 and the surface 31 of the outer housing 1, an intermediate pressure zone 32 is formed, which has three circular segments 34, 35 and 36 in the form of recesses in the surface 30. axial channel 28 in each circuit segment. Each circuit segment is limited by an outer edge section 37 and two radial sections 38. In the radial sections, there are radial grooves 39 leading to a channel 40 in the center. As a result, a second choke 41 is formed between the surface 31 and said sections 37, 38. The outer space 42 is connected to the container T over the radial grooves 39 and the channel 40 in the middle.

Hvis glideren 10 forskydes i aksialretning x på grund af trykforholdene ved styreåbningerne 8, 12, reduceres alle første drosselspalter 29, og alle andre drosselspalter 41 forøges. Mellemtrykket falder i mellemtrykzonen 32. Derfor kan glideren 10 kun bevæge sig ubetydeligt fra sin oprindelige stilling. Forholdene er omvendt, hvis glideren 10 forskydes i den modsatte aksialretning.If the slider 10 is displaced in the axial direction x due to the pressure conditions at the guide apertures 8, 12, all first choke slots 29 are reduced and all other choke slots 41 are increased. The intermediate pressure falls in the intermediate pressure zone 32. Therefore, the slider 10 can only move insignificantly from its original position. The conditions are reversed if the slider 10 is displaced in the opposite axial direction.

Hvis glideren på grund af trykforholdene ved styreåbningerne 8, 12 kipper, f.eks. som vist i retning med uret i fig. 2, falder mellemtrykket i kredssegmentet 35, mens det stiger i kredssegmenterne 34 og 36. Som følge heraf modvirkes kiptilbøjeligheden. På grund af den rotationssymmetriske anbringelse af de tre segmenter 34, 35, 36 kan der kompenseres for en kipning i hver radialretning.If, due to the pressure conditions at the guide apertures 8, 12, the slider is tilted, e.g. as shown clockwise in FIG. 2, the intermediate pressure in the circuit segment 35 decreases while it increases in the circuit segments 34 and 36. As a result, the tilting tendency is counteracted. Due to the rotationally symmetrical arrangement of the three segments 34, 35, 36, a tilt in each radial direction can be compensated.

Ved udførelsesformen i fig. 5-8 anvendes der for tilsvarende dele henvisningstal forhøjet med 100. I dette tilfælde er der i huset 101 anbragt en glider 110, som kan forskydes li neært af en aktiveringsstang 122. Ved hjælp af æn fordybning i fladen 109 forefindes der her en højtrykzone ;T24. Mellem-trykzonen 132 har fire firkantede segmenter 134 :'i fladen 130» De første drosselspalter 129 dannes mellem fladen 109 og afsnittene 126, som strækker sig mellem højtrykzonens 124 forlængelser 125 og notter 127, som altid er forbundet med en aksialkanal 128. De andre drosselspalter 141 dannes mellem fladen 131 og et randafsnit 137, som omgiver de enkelte segmenter 134. Pumpetilslrøtningen 104 står i forbindelse med højtrykzonen 124.In the embodiment of FIG. 5-8, reference numerals increased by 100 are used for corresponding parts. In this case, a slider 110 is arranged in the housing 101, which can be displaced laterally by an actuating rod 122. By means of a recess in the surface 109 there is provided a high-pressure zone; T24. The intermediate pressure zone 132 has four square segments 134: 'in the surface 130' The first throttle slots 129 are formed between the surface 109 and the sections 126 which extend between the extensions 125 of the high pressure zone 124 and grooves 127, which are always connected to an axial channel 128. The other choke slots 141 are formed between the surface 131 and an edge section 137 surrounding the individual segments 134. The pump connection 104 communicates with the high pressure zone 124.

Ved en indstilling af glideren kommer en tilhørende styreåbning 112 i forbindelse med gliderens 110 styreåbning 108, således at der kan tilføres trykvæske fra pumpetilslutningen 103 til arbejdsmotoren 106. Derved kommer en anden styreåb-åbning 108a i forbindelse med beholder-styreåbningen 112a, som over en kanal 143 står i forbindelse med det udvendige rum 142 og dermed beholderen T.When adjusting the slide, a corresponding guide opening 112 comes in contact with the guide opening 108 of the slide 110, so that pressure fluid can be supplied from the pump connection 103 to the working motor 106. Thereby a second guide opening 108a comes in connection with the container guide opening 112a, which over a channel 143 communicates with the outer space 142 and thus the container T.

Også ved denne konstruktion modvirkes der en forskydning af glideren 110 vinkelret på gliderfladerne 111, 130 ved en tilsvarende ændring af mellemtrykket i segmenterne 134. Ved en kipning af glideren antager mellemtrykkene i segmenterne 134 forskellige værdier af en sådan karakter, at kiptilbøjeligheden modvirkes.Also in this construction, a displacement of the slider 110 perpendicular to the sliding surfaces 111, 130 is counteracted by a corresponding change of the intermediate pressure in the segments 134. By tilting the slider, the intermediate pressures in the segments 134 assume different values of such a character that the tilting tendency is counteracted.

Da det kun drejer sig om den relative bevægelse mellem glider og hus, kan glideren også være stationær og huset indstilleligt, eller begge dele er lejret bevægeligt under opretholdelse af den relative indstillelighed.Since it is only about the relative movement between the slider and the housing, the slider can also be stationary and the housing adjustable, or both are movably mounted while maintaining the relative adjustability.

Claims

A sliding valve assembly with a housing (1) and a two parallel faces showing slides (10) in a two parallel faces showing chamber (42) in the housing (1), wherein two adjacent faces of slides (10) and housing (1) includes valve openings (8, 12) cooperating therebetween and forming a first throttle gap (29, 129) adjacent to a high-pressure zone, and where an intermediate pressure zone is formed between the other adjacent faces of slides (10) and housing (1) (32, 132), which is coupled between the first throttle slot (29, 129) and one opposite to this changing second throttle slot leading to the low pressure side (41, 141), characterized in that the intermediate throttle zone (32, 132) is divided into at least two spaced apart segments (34, 35, 36; 134), whose flat center of gravity lies outside the center of the slider and each segment at least interacts with a first and a second chute slot (29, 41; 129, 141) corresponding to to the position of the segments.

Sliding valve assembly according to claim 1, characterized in that the first choking slots (29, 129) lie axially to the associated segments (34, 35, 36; 134) and are connected to them over an axial channel (28, 128).

Slider valve assembly according to claim 1 or 2, characterized in that the other chute slots (41; 141) end against the associated segments (34, 35, 36; 134).

Sliding valve assembly according to one of claims 1-3, characterized in that in a device with rotatable slider (10), the intermediate pressure zone (32) is formed by at least three circuit segments (34, 35, 36).

Sliding valve assembly according to one of claims 1-3, characterized in that in a device with linearly movable square slider (110), the intermediate pressure zone (132) is formed by four * each with a corner cooperating segments (134)).

Sliding valve assembly according to claims 2 and 4, characterized in that the high-pressure zone (24) is formed by a ring groove which has: extensions (25) in the area of the axial channels (28) and that the first throttle gap (29) is limited by annular surfaces ( 26) between the high pressure system and the orifices of the axial channels (27).

Slider valve assembly according to claims 2 and 5, characterized in that four grooves (127) connected symmetrically about the longitudinal and transverse axes of the slider (110) are associated with each of the axial channel (128) and that the first throttle slots (129) ) is limited by section (126) between these notes and the high pressure zone (124).

Sliding valve assembly according to one of claims 3-7, characterized in that the space (42; 142) outside the slider (10; 110) is connected to the low pressure side and that the other chute slots (41; 141) are limited by an edge section ( 37; 137).

Slider valve assembly according to claims 4 and 8, characterized in that the circuit segments (34, 35, 36) are limited by radial sections (38) having an xadial groove (39) leading from a centric * channel with low pressure side ( 40).

Slider valve assembly according to one of claims 1-9, characterized in that the slider j (10) is connected to an external actuator (22) over a coupling (21) which allows a articulation movement T and prevents a force transfer perpendicular to the guide surfaces. .

Slider valve assembly according to one of Claims 1 to 10, characterized in that the axial clearance of the slider (10; 110) is so small that the control openings on the low pressure side in the locking position of the control openings (8, 12; 108, 112, 112a) are sealed. the other guide openings, even in the absence of pressure in the high-pressure and medium-pressure zone (24, 32; 124, 132).

12. A sliding valve assembly according to claim 11, characterized in that the axial clearance is approx. 5-50 microns, preferably about 10 microns.

Use of the sliding valve device according to one of claims 1-12 as a directional valve of a hydrostatic control device with measuring motor (13), in which the motor housing forms the slider (10) and a control shaft (22) serving as an actuating member is connected to the motor housing rotatable engine part (15).