JPH04219577A - Directional control valve operated from outside - Google Patents

Abstract

PURPOSE: To provide a direction control seal valve having a closing member and an axial hole receiving a valve member adjustable in the longitudinal direction, operated externally by an electromagnetic actuator, and having a simple structure which is easy to adjust, requires no readjustment at the time of seal replacement, and contributes to a cost reduction. CONSTITUTION: A valve box 2 is provided with a first fitting face 78 for directly fitting an electromagnetic actuator 74, a void 90 storing an adjusting lever arm 66 operated by the plunger 72 of the actuator 74, and a second fitting face 92 arranged across the displacement shaft for a valve closing member 8 and having a bracket 98 supporting the journalling pin 58 of a lever 60. A protective cover shielding the adjacent lever arm 66 from the outside is removably provided on the valve box 2.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention has an axial bore for receiving at least one valve member so that the valve member can be adjusted coaxially within the bore, the valve member being longitudinally The present invention relates to an externally actuated directional seat valve, in particular an electromagnetically actuated valve, cooperating with at least one valve closing member displaceable by a pin, said pin being actuated by an actuating lever bent in the hand of a key.

0002

BACKGROUND OF THE INVENTION One arm of the above-mentioned actuating lever is supported by a fixed bearing, and the other arm is protected from the outside and is operatively connected to an actuating member, such as an electromagnetic actuator, for load transmission. and its effective axis extends at an angle to the direction of displacement of the at least one valve closing member. Such directional seated valves are used as leak-free control valves for high pressure applications above 600 bar pressure.

Such directional control valves require precise adjustment of the adjustable elements and coordination with specific external actuating devices, especially since they inherently require a large number of individual parts.

German Patent No. 35 09 479 discloses an electromagnetically directional seated valve, which corresponds to certain parts of the features of claim 1. In that valve, adjustment of the longitudinally displaceable valve elements is facilitated by providing adjustment means screwed into the valve body and acting directly on both ends of these elements. If both of the aforementioned adjusting members are rotated simultaneously in opposite directions, the pin will leave the adjacent wall of the valve body under the action of the actuating lever by a predetermined distance before the entire valve center abuts against the external actuating mechanism. It can be displaced up to

In the known device, this is achieved by providing an adjusting screw cooperating with a pin having a hexagonal hole that receives the end of a hexagonal shank. The shank itself has a recess corresponding to the actuation pin. This shank is displaced into its working position by a hydraulic cylinder. Inside the cylinder there is a spring whose force exceeds the load applied to the opposite end of the valve seat element. The piston rod of the cylinder projects from the cylinder opposite the shank and is connected to a metering device spaced a predetermined distance from the end face of the valve body. For adjustment of the shank, it is rotated simultaneously with the threaded closure member at the opposite end of the valve body to create the previously mentioned desired gap between the end face of the valve body and the outermost end of the pin. is formed. The insert is then positioned within the adjustment screw surrounding the pin. The insert is provided with a recess coaxial with the central hole of the valve for receiving a ball for transmitting the load applied to the pin by the bent lever. The bent lever and its support member are located within an adapter member located between the actuating electromagnet and the valve body. The adapter member is
It is flanged to the valve body with two mounting surfaces perpendicular to each other. Additionally, the adapter includes a hole that receives a ball for transmitting the force of the plunger to the bent lever.

Apart from that, the known devices require a relatively complex mechanism to ensure accurate adjustment of the directional seat valve, and also require relatively expensive adapters due to manufacturing tolerances of the adapter. and the surface accuracy with respect to the valve body can no longer be compensated if the actuating lever is held firmly in its position. Therefore, the necessary precision during the movement of the valve body can only be achieved by precise manufacturing of the adapter, the actuating lever and the coupling surface.

[0007]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide an externally actuated directional seated valve, in particular an electromagnetically actuated directional seated valve, having the configuration described in the preamble of claim 1. An object of the present invention is to provide a directional control seat valve that is easy to adjust and inexpensive to manufacture.

[0008]

[Means for Solving the Problems] According to the present invention, a first mounting surface for directly mounting an externally actuated actuator, particularly an electromagnetic actuator, on a valve body accommodates a lever arm actuated by the actuator member. a second mounting surface disposed transversely to the axis of displacement for the at least one valve closure member and capable of providing a mounting bracket for the shaft support; This is achieved by providing a protective cover that shields the adjustment lever arm from the outside.

[0009]

[Operation] According to the structure of the present invention, the valve can be adjusted even when the bent operating lever is separated from the support part or is completely held by simple mechanical contact with the lever arm facing the support part. It becomes possible.

By direct attachment to the mounting surface, which serves as a reference surface for the adjustment of an external actuating device, for example an electromagnetic actuator, it is possible to compensate for errors in the valve itself and in the elements included in the load transmission system. is achieved even if there is a certain gap between the first mounting surface and the point of load transfer from the external actuating device, ie the electromagnetic actuator.

[0011] Not only can this configuration eliminate additional elements, but it can also widen the permissible manufacturing tolerances without being forced to accept a reduction in the accuracy of all components included in the load transmission system. . Therefore, more economical manufacturing is possible while maintaining the same quality.

Preferably, the valve body is a casting having an integrally formed mounting portion for the actuation lever. The cavity accommodating the lever arm on which the actuator acts may also be initially formed during casting. This provides a reliable lateral guide surface for the bent lever, which is rotatably supported about a point, with advantages for economical production. Furthermore, this provides other advantages since the cast valve body is well able to withstand pressures of 630 bar and above.

[0013] When the protective cover is removed from the valve box, the axial hole can be freely approached from both ends, so the movable valve body can be positioned using the two adjustment members screwed onto each end of the valve box. becomes. Uniaxial alignment of all the valve elements to be adjusted is achieved by rotating the two caps in unison and in opposite directions.

A mounting bracket is integrally connected to the valve body within the valve body having an integrally formed mounting portion;
The position of the fulcrum of the actuating lever can be selected relatively freely, for example, at a position sufficiently distant from the second mounting surface to allow the adjustment member to be arranged so as to protrude from the axial hole. This is extremely convenient for tool insertion. This furthermore makes it possible to provide a radial opening suitable for the insertion of an adjustment tool in the form of a shank.

[0015] Also, it is not necessary to provide a valve surround to be able to achieve the stabilizing function. The enclosure may therefore be made of plastic and is advantageously an injection molded part. This method makes it possible to form the inner surface of the enclosing member in such a way that that part serves as additional guiding and/or locking means. Particular advantages are obtained with the refinement of claim 3, which provides an integrally formed abutment surface on the enclosing part which embraces the mounting bracket on the side adjacent to the pivot axis of the actuating lever. Therefore, the rotation axis is
It can be designed as a pin sized to fit the mounting bracket. As a result, installation and removal of the bent actuation lever is considerably easier.

[0016] This simplified attachment/detachment is particularly advantageous in conjunction with the improvements of claim 8 and/or 9. The guide member can then be replaced by a simple manual operation by replacing the seal provided in the guide member without changing the valve adjustment.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of an electromagnetic directional control seat valve as an embodiment of the present invention, and FIG. 2 is a schematic sectional view thereof. In the figure, numeral 2 is the valve box. The valve box 2 has a long shaft 6
An upwardly extending longitudinal hole 4 is drilled therein. Figure 2 is 1
Within the box enclosed by the dash-dotted line, the present invention will be described in more detail later, when a valve having one or more movable valve members is provided coaxially and longitudinally adjustable within an axial bore. at least one cooperating with a closure member operable by external means;
The valve mechanism is shown to be applicable to any type of directional seated valve provided with two movable valve members.

In the device of FIG. 2, the valve comprises a single movable seat element formed as a ball 8 which rests alternately on the respective valve seats 10, 12 of the valve members 14, 16. A guide member 18 is provided between the valve members 14 and 16.

In the operating position, the ball 8 is attached to the spring 28
The rod 20 is held in position against the valve seat 10 to provide fluid communication between the pressurized space 22 and the port 24. The second valve space 26 connected to the container is simultaneously closed by the port 24.

In order to hold the movable seat element 8 in the predetermined position shown in FIG. ing. The screw 32 is connected to the valve member 16
is in contact with

The second adjustment screw 34 is screwed onto the opposite side of the valve body 2, and is brought into contact with the valve member 14, and is assisted by a thrust member (not shown) if necessary. As shown, axial alignment of valve members 14 and 16 is achieved by the two adjustment screws 32, 34 described above.

In order to lift the seat element 16 from the valve seat 10, a pin 36 is disposed in a sealing relationship in the bore 38 of the second adjustment screw 34. The pin 36 includes an outwardly projecting extension 40 that projects outwardly. The extension 40 is also guided in a sealed manner into an inner bore 42 of a threaded insert 44 that threads into a second adjustment screw 42 . Said seals are designated 46 and 48, respectively, and are pressurized via a conduit 52 provided between them and schematically shown in dashed lines, sealing off a space 50 communicating with the outside facing valve space 22. There is. In this way, the pressure on the pin 36 is offset by the counterresistance provided by the valve seat when the valve is actuated, eliminating the need to overcome this.

The pin 36 is actuated by a ball member 54 that contacts the extension 40. The ball 54 is received in a hexagonal socket 56 of the insert 44 such that the front end of the insert 44 projects a distance at least equal to the predetermined displacement Ms.

The ball 54 and the pin 36 are acted upon by a lever transmission configured as an actuating lever 60 pivotably supported on a shaft 58 and bent in the hand of a key. This lever has a semi-circular recess 62 near one end holding a pin 58 forming a pivot axis, and the opposite side of the lever contacts a ball 54. The other arm 66 extends generally perpendicular to arm 64 and contacts at its end a ball 70 that transmits external forces to actuating lever 60 . In this embodiment, actuation of the lever is provided by a plunger 72 of a solenoid 74. The solenoid 74 is attached to the valve body 2 by a flange and fixed with screws. Reference numeral 76 is a power supply section to the solenoid 74.

FIG. 2 shows the disengaged position of the plunger 72 and the flange-mounted solenoid 74. This position of plunger 72 corresponds to the optimal adjustment position of the valve, given maximum valve shift accuracy.

From these figures, it can be seen that the solenoid is mounted directly on the mounting surface 78 of the valve body 2. By doing this, the reference plane for valve adjustment becomes clear. To compensate for assembly and manufacturing tolerances of the valve components, the amount of protrusion of the ball 70 from the first mounting surface 78 of the valve body 2 after assembly of the complete valve center and insertion of the bent actuation lever is determined. It is only necessary to define the spacing X as . Spacing X is defined as a function of the applied solenoid and is obtained by tightening the shoulder 84 of the member 80 screwed into the threaded hole 82 of the valve body 80 until it abuts the mounting surface. Recess 8 in member 80 to be screwed
The diameter of 6 matches the diameter of ball 70 and provides a contact surface 88 a distance X from mounting surface 78 when fully tightened. Contact surface 88 constitutes a mechanical interface for adjusting the valve. This will be explained in more detail below.

In this embodiment, the valve body is provided with an open-ended cavity 90 below the first mounting surface 78 to permit direct attachment of an external actuator, shown as a solenoid 74, to the valve body. It is being This cavity is preferably formed using a core during casting of the valve box 2. This void space is at least partially filled with the lever arm 6 of the bent actuating lever 60.
6. Designed to form lateral guide surfaces for 6. The cavity 90 is preferably at right angles to the first mounting surface 78 and opens towards a second mounting surface 92 which is perpendicular to the valve axis 6 . The mounting surface 92 protects the actuation lever 60 and
Plastic molding allows for the attachment of a suitable protective cover or hood 94. The valve space accommodating the bent actuation lever is sealed from the outside by an annular seal 96 held in place by the edge of the hood 94. The lower portion of the hood 94 supports a mounting bracket 98 that protrudes from the second mounting surface 92. Mounting bracket 98 is preferably integrally formed as part of valve body 2 (see FIG. 4). Hole 100 of mounting bracket 98
has a shape that fits the pivot pin 58. Food 9
Loose ribs 102 and 104 are integrally formed on the inner surface of the shaft support pin 58, with which both free ends of the above-mentioned pivot pin 58 can abut. As a result, the size of the hole 100 can be selected to facilitate replacement of the pivot pin 58.

The inner surface of the hood 94 is also provided with integrally molded guide elements 106, 108 to ensure additional lateral position fixation of the arms 64.

The assembly and adjustment of the electromagnetically actuated directional seated valve described above is carried out as follows: In the first step, the valve center (shaft 6) is assembled with the valve members 14, 16, 18, the valve seating 8, and the rod. 20 together with the spring 28 and pin 38 into the axial hole 4, and tighten the adjusting screw 3.
It can be completely installed by roughly positioning the 2. A second adjustment screw 34 with a fully threaded insert as shown in FIG. 2 is then inserted into the right side of the valve body and tightened until it abuts the valve member 14. After inserting the ball 54 into the hexagonal hole 56 of the insert 44, the arm 66 of the bent actuating lever 60 can be positioned within the cavity 90, and the other arm 64 is attached to the pivot pin 5.
8 is secured. By placing the ball 70 on the free end of the lever arm 68, a space is created between the top surface of the ball and the mounting surface 78. It is screws 32 and 3
It is desirable to make the distance X smaller than the distance defined by the rough adjustment in step 4. A threaded stop member suitably adapted to the actuating solenoid is threaded into a threaded hole 82 in the valve body and, when fully threaded, extends a distance X from the mounting surface 78.
By providing the mechanical abutment surfaces of the balls 70, which are separated by a distance, and simultaneously tightening the first adjusting screw while loosening the second adjusting screw 34, all valve elements are generally axially positioned. As soon as ball 70 engages abutment surface 88, adjustment of the valve is complete. To ensure easy access and rotation of the second adjustment screw 34 when the actuation lever is installed, the end face of the screw 34 is provided with a radially extending hole 110 into which a suitable tool, such as a pin, can be inserted. After the adjustment is completed, the stop member is unscrewed from the valve body and the solenoid 74 is then positioned in position. The solenoid plunger 72 in the position shown is then precisely positioned relative to the actuation lever 60. When the assembly is complete, the hood 9
4 is placed over the mounting surface 92 and fixed to the valve box using a holding means (not shown).

As previously mentioned, the rods or pins 36 in this type of directional control valve are pressure balanced to minimize the forces required for shifting. However, this method places relatively high loads on the seals 46 and 48, which block the space 50 and are generally configured as packings. The unique valve design described above allows replacement of seals 46 and 48 to be easily accomplished with only a few manual operations without the need for readjustment of the valves. The replacement procedure is as follows.

After removing the hood 94, the pivot pin 58
is easily accessible from the side and can be pushed out of the hole 100. This releases the bent actuating lever 60, which can now be removed together with the ball 54. Hexagonal hole 56 is used to remove the insert from screw 34 so that seals 46, 48 can be freely accessed and removed. Since neither adjusting screw 32 nor adjusting screw 34 are rotated, the valve remains adjusted. After removing the seal, reinstall the seal in the reverse order and the valve is ready for use in a short time.

It is recognized that partial changes in the implementation of the directional control seat valve described above are possible within the scope of the claimed invention. For example, if the mounting surface 78 is
Although perpendicular to the mounting surface 92 is not necessary, this angle has proven to be the most desirable angular relationship for mechanical operation of the valve. Furthermore, the mounting bracket 98 does not necessarily need to be integrally molded with the valve body 2. The mounting bracket can also be made as a separate member and attached to the second mounting surface. The design according to the invention also shows the possibility of changing the semicircular opening 62 for the pivot pin into a circular hole.

According to the invention, the valve has an axial bore for receiving at least one longitudinally adjustable valve element cooperating with at least one coaxially moving closure element;
Externally actuated, in particular electrically or electromagnetically actuated, directional seat valves can be obtained. The movable closing element is adapted to be displaced by a pin or rod actuated by a lever bent in the hand of the key. This means that one arm of said lever is supported by a fixed bearing, and a load is applied between the other arm and the actuating member of a solenoid whose axial direction forms an angle with the direction of movement of said at least one valve closing member. This can be achieved by providing a transmission link. In order to facilitate the setting or adjustment of the valve while retaining the required functional accuracy, the valve housing is provided with a first mounting surface or surface for direct mounting of the electromagnetic actuator and an actuating lever to which the pressure from said solenoid actuator is applied. A cavity is provided to accommodate the arm. Transversely to the direction of displacement of the valve-closing element, the adjustment of the valve covering the mounting bracket for the bearing means and the arm attached to this mounting bracket moves the entire center of the valve coaxially in the central bore towards the actuating lever. This can be done with the help of mechanical elements by limiting the range of rotation of the actuating lever about its fulcrum.

[0035]

As described above, the present invention provides an externally operated directional control seat valve which has a simple structure, is easy to adjust, and does not require readjustment when replacing the seal. This is effective in reducing costs and improving work efficiency in adjustment and seal replacement.

[Brief explanation of the drawing]

FIG. 1 is a side view of an electromagnetically actuated directional seated valve according to an embodiment of the present invention.

FIG. 2 is a sectional view thereof.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

[Explanation of symbols]

2. Bento box 6 Displacement axis 8 Closing member 12, 14, 16, 18 Valve member 32, 34 Adjustment member 36 pin 44 Guide member 58 Bearing 60 Lever 64, 66 Lever arm 70, 72 Operating member 74 Electromagnetic actuator 78 First mounting surface 80 Stopping member 82 Screw hole 90 Blank space 92 Second mounting surface 94 Food 102, 104 Blocking rib

Claims (12)

[Claims] 1. At least one valve member (12, 14,
16) having an axial bore (4) for receiving said valve member such that said valve member can be coaxially adjusted in said bore (4), said valve member having at least one shaft displaceable by means of a pin in the longitudinal direction.
In cooperation with two valve closing members (8), said pin is actuated by an actuating lever bent in the hand of a key, one arm (64) of said actuating lever being supported on a fixed bearing (58) and the other The arm uses an electromagnetic actuator (
74) is operatively coupled to the actuating member (72, 70) of the
In an externally actuated directional seat valve, in particular an electromagnetically actuated valve, the effective axis extends at an angle to the direction of displacement of the at least one valve closing member,
The valve box (2) of the above valve is an electromagnetic actuator (74)
a first mounting surface (78) for mounting the actuating member (70);
, 72), and a cavity (90) for accommodating a lever arm (66) actuated by the at least one valve closing member (8), arranged transversely to the axis of displacement (6) of said at least one valve closing member (8), (58), said valve body (2) having a second mounting surface (92) suitable for providing a mounting bracket (98) for said valve body (2);
The directional control valve further comprises a protective cover (94) that shields the adjacent actuation lever (60). Claim 2: The valve box (2) has an operating lever (6
2. Directional control valve according to claim 1, characterized in that the mounting bracket (98) for 0) is an integrally formed casting. 3. The support end of the lever arm (64) is rotatably supported by a pin (58), and the pin is prevented from moving in the axial direction by a blocking rib (102,
104) The directional control valve according to claim 1 or 2, wherein the directional control valve is controlled by a valve 104). [Claim 4] The lever arm (
The directional control valve according to any one of claims 1 to 3, characterized in that the mounting surfaces (78, 92) of the valve body (2) are arranged at right angles to each other. . 5. The at least one adjustable valve member (14, 16, 18) is axially controlled by two adjustment members (32, 34) each threaded onto opposite ends of the valve body. The directional control valve according to any one of claims 1 to 4, wherein the directional control valve is arranged so as to be positioned at. 6. Directional control according to claim 5, characterized in that said adjusting element (32, 34) is arranged coaxially with the displacement axis of at least one valve closing element (8). valve. 7. The actuation lever (
60) The directional control valve according to claim 5 or 6, wherein the directional control valve is provided in contact with the directional control valve. 8. An adjusting member (34) cooperating with the actuating lever (60) is arranged in the guide member (4) of the pin (36).
8. The directional control valve according to any one of claims 5 to 7, characterized in that it has an internal thread into which the directional control valve 4) is screwed. 9. The directional control valve according to claim 8, wherein the guide member (44) is in contact with a packing. 10. The first mounting surface (78) is attached to the valve stem (
10. The directional control valve according to claim 1, wherein the directional control valve extends parallel to the direction control valve 6). [Claim 11] A screw hole (82) capable of receiving and screwing the stop member (80) into the valve body (2) until it comes into contact with the valve body (2).
The directional control valve according to any one of claims 1 to 10, characterized in that the directional control valve is provided with a. Claim 12: The above protective cover or hood (94
12. Directional control valve according to claim 1, characterized in that ) is an injection-molded plastic part.