DE1675549A1 - Control valve - Google Patents

Description

PATENT LAWYERS DIPL-CHEM. DR. WERNER KOCH DR.-ING. RiCHARTJ GLAWE DIPL.-ING. KLAUS DELFS HAMBURG · MÖNCHEN

2000 Hamburg 52 Waltzitrafl 12 Ruf 892255 8000 Munich 22 LI * bherr <troB 20 Call 224548

J OUR SIGN HAMBURG, DEN

HAMBURG ρ 4798/68 D / Bl.

WORTHINGTON S.A., Paris 8 / France, 9, Rue de Vienne,

Control valve

The invention relates to a control valve, in particular on a control valve with a rotatable valve body or closure part for controlling the flow in a pipe system or similar.

Rotatable valve body control valves and their general operating characteristics are well known in the art. the The basic condition for their operation is that they must be adjustable between a tight or completely closed Position and an open position with a fully open flow cross-section to determine the flow and its speed to be able to control · In today's systems for pumping liquids or gases, it is desirable that the increase in

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009882/0654

The current in the vicinity of the complete barrier is relatively low is. In other words, quick opening and closing properties have each other proved detrimental to dynamic stability in an automatic control loop · It is also desirable that the Flow control begins immediately after the final movement of the valve body in the shut-off position · This can also be done are viewed as the elimination of the regulating movement of the valve body beyond the actual shut-off point, which has so far been the case was necessary to achieve a complete seal against leakage flow

Many different forms of rotary valves, taps, flaps, etc. have heretofore been proposed and used in the industry, with each was designed with known operating characteristics and specific application problems in mind. It has has shown that a simple axial increment of movement with normal rotation of a throttle valve has rapid opening and closing properties which makes it suitable for general use as a shut-off device, i.e. as an on-off valve

In the case of an eccentrically mounted rotatable valve body difficulties arise with regard to a valve seat arrangement that is secure against leakage flow. To overcome this problem, various cam arrangements were proposed for the complete contact pressure of eccentrically mounted rotary valve bodies, as described in U.S. Patents 1,213,513, 1,504,288, and 1,595Ο38 are illustrated. Such cam arrangements are generally expensive and difficult to manufacture, subject to wear and malfunction, require a relatively high

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Maintenance effort and considerably increase the amount of valve actuation mass to be moved. Even more important is the empty movement, which is inevitable in such a construction and which makes it unsuitable makes for use in automatic control

On the other hand, eccentric valves of the coil type are rotatable curved closure surface or cross-sectional arrangements in the Opening area known as described in U.S. Patents 3,170 and 3,254,872 are shown. This construction requires a large and heavy su-moving wet, which has a relatively extensive, rubbing surface with the parts forming the opening of the valve housing has both the valve constructions that work with cams as well as the coil type valves usually cause manufacturing difficulties because of the small size Tolerances that must be adhered to in order to achieve sufficient tightness against leakage flow · All these arrangements are also subject to relatively severe wear conditions, and leakage flow easily occurs after a limited operating period on · In order to increase the manufacturing tolerances and thereby facilitate the manufacture and to continue to reduce the wear and tear In order to reduce the resulting leakage flow, deformable seals are used, as in several of the patents mentioned is illustrated. Deformable seals solve the problems mentioned at least in part, but are subject to wear and a deterioration in their properties under friction, flow erosion and aging, as well as under the attack of the flowing Media and the ambient conditions prevailing in the system.

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There are also various rotary valve bodies with spherical surfaces has become known and has been used in such flow control organs · It has been shown that valves, in the usual way are constructed and belong to the type with such a sealing surface, also deformable seals to achieve a as shown in U.S. Patents 3,090,593 and 3,191,906.

One must keep in mind that the frictional forces are relatively high occur in valves that have deformable seals and in which extensive, sealed interfaces with are in contact with the rotatable part during its full stroke, which - just as in the case of valves with heavy moving masses - are power drives with higher operating forces than would normally be required «

The object of the present invention is to create a rotary valve that is relatively simple and insensitive constructed, inexpensive to manufacture and safe to operate · Furthermore, it is desirable that the rotary valve move a minimum Has parts that are freed from all possible friction and dead gait have what by avoiding V-shaped control slots and similar shape of the cross-section determining Outlines is achieved that were previously common in rotary valves · Finally, it should be provided that a valve of this type is connected to actuating devices and together with these actuating devices forms an assembly unit.

009882/065 /,

The solution according to the invention consists in a rotary valve with drive means suitable for installation and dismantling as a unit, the valve having a housing with a tubular arm protruding on one side thereof which encloses a valve chamber which has openings at its ends} on the inside of one of the openings an annular valve seat is provided which forms a substantially rigid circular surface, the center of which coincides with the flow axis through this valve seat rigid, spherical valve disc with center on the central axis) at the other end of the closure part a shaft is attached which extends through the tubular arm] the shaft is mounted in such a way that it rotates on an axis transverse to the flow axis and the spherical Valve head eccentric to the valve seat de r opening swivels! the rotatable shaft rotates the spherical valve head into contact with the valve seat and exerts a force along the central axis such that the spherical valve head is caused to pivot about the point of its first contact with the valve seat and then fully counter to the valve seat To seal leakage flow! ^the actuating devices are arranged on the tubular arm! and an actuating arm is fixedly attached to the shaft and connected to the actuating devices

The invention will be described in more detail below with reference to the exemplary embodiments shown in the drawing, which have particular advantages of the invention described. In it are:

BAD ORIGINAL 5 - 009882/0654 1 shows an end of the valve arrangement according to the invention, Pig 2 shows a side view of the valve arrangement according to FIGS ₀ 3 i * t a vertical section through the entire valve arrangement; the

Figures 4 and 5 are sections taken along lines 4-4 and 5 ~5, respectively Fig. 31

Fig. 6 is such a partially sectioned one on an enlarged scale Side view of the valve assembly that some of the parts working in it are visible |

Fig. 7 is a horizontal section through another embodiment of the valve arrangement according to the invention |

FIG. 8 shows a section along line 8-8 of FIG

9 and 10 show top and side views of an inventive Valve body I.

FIG. 11 is a perspective view of the valve body according to FIG Figures 9 and 101

FIG. 12 shows a longitudinal section of the drive means shown in FIG dar ι

13 is a partial section on line 13-13 of FIG. 12 in FIG larger scale!

Fig. 14 shows the partially sectioned perspective view

an eye or sealing ring used in the drive device according to FIG. 12)

Fig. 15 is a schematic representation of various possible Fastening positions of the drive devices on the valve arrangement and

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BATH ORIGINAL Figs. 16 and 17 are typical flow diagram for known Valve flaps or for rotary valve according to the invention

The valve or valve arrangement 20 according to the invention shown in the drawings and in particular in FIGS. 1 to 3 is provided with power drive devices 21 and manual drive or override devices 22 Liquids or gases or a line are switched on The line or the pipe sections 23 and 25 have corresponding flanges 24 and 26 which are connected to one another via the valve 20 in the usual way by means of a plurality of tie rods which are screwed at the ends sealing means (nichl shown) are provided between the ends of the valve and the flange ends of the pipe sections 23 and 25 · the valve housing 30 of valve assembly 20 preferably has a slotted portion or Gab "lt" il Jl ₁ represents with "INEM the tie rod to prevent rotation of the valve arrangement 20 relative to the line sections 23 and 25 together kt

The housing 30 of the valve assembly 20 closes a valve chamber one with openings 33 and 34. at their ends that have the required Represent flow connections between the chamber and the line sections 23 and 25 · From one side of the valve housing 30 protrudes a tubular arm 35 facing outwardly along axis B-B which is laterally or transversely relative to the longitudinal axis or flow axis A-A through the valve housing · The arm 35 also extends into the chamber 32 and there forms a hollow or annular one

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Projection 36, here axially with an annular projection 37 an enlarged or radially extending annular flange 38 is aligned on the opposite string of the valve chamber with a number of spaced openings 39 iat the free end of the arm 35 for attaching drive devices 21 and 22 as described below.

In the projections 36 and 37 there is a shaft 40 longitudinally in bushes the transverse axis B-B rotatably mounted and extends out of the planach end of the Arats 35, which has a suitable ring seal or pack 41 to prevent leakage losses along the chamber length of the shaft a Opening 43 which sits on the end of the arm 35 and a number of spaced apart openings 44, respectively the openings 39 for attaching the arm to the flange 38 in the middle Bolts or screws 45, as also seen in Pig 3 and 5 is * on the arm is «in the bearing cover, a console or the like for a bearing arrangement 46 which rotatably supports that end of the shaft 40 which is supported in the projection 37 Shaft end is opposite

The other end of the arm 42 is suitably connected to the drive means 21 connected, the iat illustrated example of a cylinder 47 of a working in the axial direction Motor ait a piston 48 are formed with the one The end of the valve actuating device 50 is hingedly connected is keyed to the shaft 40 or in another

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appropriate Veise is connected with this «Die Kraftantriebeinrichtung or the axial motor 21 is preferably of the type which is expanded by hydraulic fluid and a return spring as will be described below the arm 42 further includes a portion 49 near the bearing assembly 46 (Fig. 6), which is provided with a thread or designed as a nut and for the manual control devices or override * facilities 22 serves

The manual actuation or override devices 22 consist of a threaded spindle 52 with a handwheel 53 at one end. The spindle 52 is rotatable and axially movable in the nut part 49 against a stop 51 at the end of the arm 50, which is located opposite its end connected to the piston 48. As can be seen from Fig., The threaded spindle 52 moves when it is rotated is, axially against the stop 51, whereby the arm 50 is rotated against the return spring of the motor 21 about the axis BB from its position shown in solid lines in the direction of the position shown in dashed lines. When the threaded spindle 52 is rotated in the opposite direction, it moves axially away from the stop 51, followed by the arm 50, now rotating in the opposite direction to the position shown in solid lines under the action of the return spring of the motor 21. A lock nut 54 is provided on the threaded spindle 52 for securing against movement in a predetermined position. A scale 55 and a pointer kb are provided on the arm 42 and on the lever 50, so as to be visible

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Indication of the position of the valve body 60 to provide the valve assembly, which are of particular use when the threaded spindle should be set as limit stop

With reference to Pig * 4, it can be seen that the valve shut-off in this example is carried out at port 33, which is in stages is drilled and tapped * A sealing or valve seat insert 57 with an outer ring shoulder is held in the stepped bore by a ring nut 59 · The inner ring edge of the Valve seat insert 57 is expediently machined so that that there is a circular sealing surface 58, the Hitte lies on the longitudinal or flow axis A-A and which in this case essentially coincides with the wall surface of the valve chamber 32 coincides with or is flush with it.

It will be seen from Figures 3 and 9-11 that the valve body 60 is of unitary, one-piece construction and has one at one end has tubular support member 61 which is connected to the shaft 40 by means of splines or other suitable Veise · a Pair of converging arms 62 extends from the ends of the holder part 6l to a circular plate 64, the one substantially rigid, spherical surface 65 at the other end of the Valve body 6b forms. The arms 62 are conical or otherwise expedient Veise shaped so that they have a portion 63 reduced Form thickness close to the valve head 64, which is bendable and accordingly a certain angular displacement or tension of the Valve plate allows for complete placement of the spherical

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Surface 65 on the valve seat surface 58 of the valve seat ring 57 to ensure · The central part of the spherical surface 65 is - as shown - preferably removed in order to prevent the during the Actuation of the valve arrangement 20 mass of the valve to be moved " body 60 · The opening 34 is larger in diameter than the valve disk 64 or as the axial length of the mounting part 61. The valve housing 30 can thereby be made in one piece be constructed by the retraction of the shaft 40 from the valve housing 32 through the tubular arm 35 the valve body released so that it can be removed through opening 34

In order to fully understand the mode of operation of the valve arrangement according to the invention, a discussion of the geometry of the associated internal parts required. As mentioned, the axis A-A is the longitudinal axis or flow axis of the valve chamber 32 and the Valve Seat Rings 57 · The center of the circular area 58, which is the inner Representing the end of the controlled opening, lies on the axis A-A * The valve body 6O has a central axis C-C through the valve disc 64, which substantially coincides with the axis A-A when the spherical surface 65 rests on the valve seat 58, as shown by the dashed line position of the valve body 60 is indicated in FIG. 4. As a result, the center of the spherical surface 65 lying on the central axis C-C also lies on the flow axis A-A when the valve body 60 closes the valve seat 57 against the flow

The transverse axis B-B is the axis of rotation of the shaft 40 and the valve body 60 or the holder part 6l of the valve body, which is connected to the shaft 40} this axis is opposite the

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Center D of spherical surface 65 offset along axis CC in a direction away from valve head 64 · The transverse axis BB is also offset from axes AA and CC in the closing direction of valve body 60, which is substantially perpendicular to it and to the axes The center D of the spherical surface 65 therefore describes a curved path E ₁ when the valve body is rotated, so that the spherical surface 65 rotates relative to the valve seat surface 58 combined with axial movement or eccentric rotation ·

The point P at which the surfaces 58 and 65 first touch, as shown in Fig. 4, lies on the front of the valve head 64 in the direction of its closing movement | thereafter becomes the axial component of the eccentric torque along the Central axis C-C exerted by a lever arm B-D. The axial force along the axis C-C forces the valve disc 64 to pivot around the point P of the initial contact until it is fully seated the spherical surface 65 on the valve seat surface 58 on · This The valve disk 64 is given a pivoting or landing movement by a limited bend in the parts 63 of reduced thickness of the arms 62 enables 1 it is a metal-to-metal seal between hard or rigid surfaces reached Similar functions in the opposite sense take place when the valve starts to open At this moment the forces resulting from the bending of the arm force the valve disk 64 to move around the point of contact P. to pivot so that the front of surface 65 in the direction of opening movement rises from surface 58 and the valve

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seat 57 opens immediately as soon as the opening movement begins «The effective metal-to-metal seal between the surfaces 58 and 65 of the valve seat 57 and the valve body 60 makes a deformable sealing part or extensive friction surfaces unnecessary. that there is no backlash or beyond the lock-off movement of the valve body or of the controls and the flow control ends or ₀ begins immediately with the termination · or with the onset of valve actuation ·

The characteristic curve (throughput as a function of the valve opening) of a typical, conventional valve of the flap type, as shown, for example, in the above-mentioned patent specification 1 504, and its change are shown in diagram 16 when the valve is closed, so that only the conditions during the opening process need be discussed · Bs shows that a certain valve movement already occurs before the flow begins · This is necessary so that the cam can be adjusted sufficiently to lift the Enable flap see below · As soon as the flow begins, the increase in flow is extremely rapid, as illustrated by the curve, while after about 25 % of the valve movement there was no more significant change in the flow rate

A corresponding diagram is shown in FIG. 17 for a corresponding, typical rotary valve according to the invention shown. It goes from there

009882/0664 BATH ORIGINAL

without further ado that the current is directly related to the initial or final movement of the valve begins or ends) and that the change in the flow rate in the smaller or initial valve positions is much smaller than when the valve body is a few degrees from the controlled opening has moved away · It also shows that an effective flow control over the entire area the valve movement is obtained

A modified Venti! Construction according to the invention is shown in Pig x 7 and 8 · In this example, a modified valve housing 7 ° "or provided it end flanges 7 ¹ for each independent connection with various pipe flanges 34 · The valve housing 70 defines a valve chamber 72 with end openings 73 and 74 corresponding to the chamber 32 and their openings 33 and $ k of the valve housing 30 of the above-described example. In this modified construction, a tubular arm 75 has a conical hub portion 76 which extends through a corresponding opening 77 of the valve housing 70 into the chamber 72 and therein an annular projection corresponding to the projection 36 of the above

Example forms.

Ψ The arm 75 is provided with a flange 78 near the hub portion which is connected to the housing 70 by means of pins 79 or in any other suitable known manner. Suitable means for sealing the connection between the housing 7t) and the arm 75 to prevent leakage losses are

BATH ORIGINAL

intended. Sin L-shaped support member or Arn 80 extends from the hub portion 76 to the opposite side of the chamber 72 and has an opening 81 in its bent leg which is in alignment with the hub 76 at a distance therefrom and the Hub 37 in the example described above corresponds to · In a similar manner to the valve arrangement 20, a shaft 40 is in sleeves rotatably mounted in the hub 76 and in the bore 81 along the transverse axis B-B. A valve body 60 is again suitable Manner attached to the shaft 40 as shown in the figures.

The opening 73, like the opening 33, is drilled and undercut in steps to accommodate a * valve seat insert 82 bit one outer annular shoulder, which corresponds to the valve seat ring 57 and the ring nut 59 by means of a ring nut 84 in the bore is held «The inner annular edge of the valve seat ring 82 is machined in a suitable manner to form a surface 83, the corresponds to the sealing surface 58. The valve seat ring 82 forms again the inner end of the opening to be controlled, but the sealing surface 83 in this case is within the wall surface of the chamber 72 located! it works again in the same way as the spherical one Surface 65 of the eccentrically pivotable valve body to form a rigid metal-to-metal seal with hard sealing surfaces together.

As shown in Figs. 12 to 15, the power drive mechanisms are provided or the axial motor 21 a stationary cylinder 47 and a piston 48. The cylinder 47 is with a

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tubular body 85 which is closed at its ends by walls 88 and 88. The end wall or back plate 86 has a suitable opening 87 for connection to a pressure medium source, and the end wall or face plate 88 is provided with a slot 89 provided, which is arranged vertically or parallel to the extension of the actuating arm 50 in relation to the valve arrangement 20. An eye or a bushing 90 has a rectangular or square hollow body part 91 which extends through the slot extends and is movable back and forth between the ends of the slot. A pair of spaced apart flanges 92 and 93 is provided at the ends of the body 91 and covers the Slot 89 off · A pair of ventilation holes 94 and 95 are in the Flanges 92 and 93 are provided, each attached to different ones Sides of the slot 89 opens

The piston 48 has the usual head 96 in the cylinder 47 and a Rod 97 extending from the head and extending through the central opening of the body 91 in the bushing 90. That the head 96 remote end of the rod 97 forms that end of the piston 48 which is pivotably connected to the end of the actuating arm 50 « The head end of the rod 97 is provided with a thread that a spring plate 98 is fastened in a suitable manner in such a way that it can be adjusted axially closer to or further from the piston head 96 is. A spring 99 is in the cylinder 47 under pressure between the Froiitplatte 87 and the spring plate 98 arranged, the "ine permanent Exerts force on piston head 96 such that it is urged toward the backplate

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Pressure fluid flowing in from the opening 88 acts on the piston head 96 in the sense that the piston 48 is moved axially away from the back plate 86 and, against the action of the spring 99, the rotation of the actuating arms 50 from its position shown in full lines to its position shown in dashed lines Position (FIG. 6) causes the release of the pressure fluid to allow the spring 99 to move the piston 48 and arm 50 back. Rotation of arm 50 causes movement of the end of rod 971 attached to the arm across the direction of axial movement of piston 48. This transverse movement is achieved thanks to the passage 90, which is movable in the slot 89, without the axial motor 21 jamming. It can indeed suitable known in the art seals between the tubular portion 85 of the cylinder 47 and the head of the piston are provided 48 96, however, a tubular rolling seal, as shown in FIG _o 12, preferable so that the friction in the Motor 21 is as small as possible and also to help ensure that the transverse movement of the piston 48 does not cause any jamming.

As shown in FIGS. 2 and 15, the actuating devices can or the axial motor 21 on the valve assembly 20 by means of the arm for spring-operated closing movement in the position shown in FIG and mounted in three further positions shown in Fig. 15 with each position offset by 90 from the others is. The actuating devices or the axial motor 21 can also be in corresponding, above-shown positions for spring-actuated Opening movement can be applied by means of an arm which is formed in an opposite mirror image with respect to the arm 42.

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It is understood that the invention is not limited to the particular construction or arrangement of parts shown, but that extensive changes to the exemplary embodiments are possible within the scope of the invention.

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Claims (10)

PATENT CLAIMS 1. Control valve with rotating valve body, characterized by the combination of the characteristics that a housing (30, 70) has a valve chamber (32, 72) with inlet and outlet openings (33, 3 ^ | 73, 74) for the current to be controlled includes | that one of the two openings (33, 73) has an annular seat (57, 82) an essentially rigid, annular sealing surface (58, 83) has ι that a valve body (60) of uniform structure a substantially rigid, spherical surface (65) at one end and a deformable part (63) adjacent to this surface having; that the valve body can be pivoted about an axis (B-B) is held, which is transverse and offset to the central axis (C-C) of the valve body and the flow line (A-A) and around which the spherical surface eccentric to the rigid, circular sealing surface is pivotable in and out of contact with this sealing surface to control the current | that the spherical surface under the Force of the device (40) rotating the valve body and deforming the deformable part of the valve body around the point their first contact with the sealing surface can be pivoted until it is completely and tightly in contact with the sealing surface, or the spherical surface under the influence of the deformed part of the valve body after the start of the opening movement of the sealing surface lifted off - 19 - BATH ORIGINAL 009882/0654 2. Control valve according to claim I _1, characterized in that the valve body consists of a spherical surface holding or forming plate (64), a holding part (61) at a distance from the plate, which is connected to the devices for holding and rotating the valve body, and one or more arms connecting the plate and the holding part, which arms are shaped in the vicinity of the plate in such a way that they form the deformable part permitting the limited angular movement of the spherical surface. 3 · Control valve according to claim 2, characterized in that the the deformable part forming arms of the valve body accordingly the size of the valve disc are shaped in such a way that they produce the desired angular movement of the spherical surface allow the opening and closing movement 4. Control valve according to one of claims 1 to 31, characterized in that that the holding and rotating device for the valve body has a tubular part (61) on the valve body then aligned bearing (36,37, 76,81) at the valve chamber, one of which cannot rotate with the tubular part of the valve body connected, the bearing penetrating, in the valve chamber and out of this extending shaft (40) and with the shaft associated drive means for rotating the shaft and actuating the valve body comprises, the axis of the shaft and the tubular portion on the valve body from the central axis of the valve body and the flow axis is arranged offset through the housing. - 20 - 009882 / 065Λ BAD ORJGINAL 5. Control valve according to one of claims 1 to 4, characterized in that that the holding and rotating device continues to be one with the outside of the housing and radially to arm (50) connected to the axial line of the flow in the housing extending end of the shaft and drive means (21) for rotating the shaft connected to the arm. 6 «control valve according to one of claims 1 to 5t characterized that the holding and rotating device furthermore comprises an arm (80, 8l) which is operatively connected to the housing (70), which receives the tubular part (6l) of the valve body and at the end a bearing for the rotatable mounting of the dem Has operating arm facing away from the end of the shaft, 7. Control valve according to one of Claims 1 to 4, characterized in that that the drive device consists of an axial motor (47), the cylinder (85) of which is attached to the housing and the axially movable piston of which has a piston rod (97, 48) connected to the end of the actuator arm (50) is" 8 «control valve according to one of claims 1 to 5 * characterized in that that the cylinder (85) is closed at the front end by a wall (88) which has a central slot (89) has, which is located substantially parallel to the direction of the actuating arm and in which a passage (90) is mounted movably in its longitudinal direction, wherein the piston rod extends through the implementation and the - ²¹ - 009882/0854 ORIGINAL BATHROOM Implementation under the transverse movement of the caused by the longitudinal movement of the rod when the actuating arm rotates The piston rod can be moved back and forth in the longitudinal direction of the slot 9 · Control valve according to one of claims 6 to 8, characterized in that that the implementation of one arranged in the slot and with an axial passage opening for the piston rod is provided with a right-angled body with two annular flanges (92, 93) at a distance from each other mounted on different sides of the body to cover the slot and each of which with a ventilation opening (94, 95) for ventilation of the opposite Ends of the slot is provided. 10. Control valve according to one of claims 1 to 9, characterized in that that the valve body is pivotable between two end positions, in one of which the flow path through the Valve housing is released, while in the other the valve seat is sealed against leakage that one end wall (86) the rear end of the cylinder (47) closes the opening (87) for connection to a pressure medium source possesses that the piston has a piston head (96) connected to the piston rod (97) and axially in the cylinder is movable that a compression spring (99) is provided in the cylinder between the piston head and the front wall (88) which the The piston head pushes towards the rear wall (86) with the return of the axial motor, the valve body in one of its end positions - 22 - 009882/0654 BATH ORIGINAL 1 & 76549- is rotated, and that the piston head is under the influence of through the opening (87) penetrating pressure medium is movable towards the front wall (88), whereby the valve body in the other of its end positions is rotated 11 «Control valve according to one of claims 1 to 10, characterized in that that the one attached to the "tubular ar" (35t 75) Arn (42) "is provided with a thread device (49) that the actuating arm (50) has a free projection which extends from the shaft in a direction opposite to the ■ it the axial motor connected end that in the Screw device (49) a screw part (52) rotatable and thus axially movable in the direction of the projection (51) is that the actuating arm (50) can thereby be rotated against the action of the return spring (99) of the axial motor reverse rotational movement is axially movable away from the projection such that the actuating arm under the action of The return spring of the axial motor is turned in the opposite direction bad or «« «. ^M 009882 / 06B4