JPH081466U - Control valve for steam box - Google Patents

Abstract

(57) Abstract: A structure of a valve for controlling supply of steam and air to a steam box of a web dryer is improved. SOLUTION: A cylindrical valve body is provided with a first valve seat communicating with a steam source and a second valve seat communicating with an air source at both ends thereof, and is slidable in a vertical passage in the valve body in a piston type manner. Reciprocally open and close the first valve seat and the second valve seat at both ends of the valve stem,
The steam that has passed through the first valve seat and the air that has passed through the second valve seat are allowed to flow out into the steam box through a port that opens in the middle of the vertical passage.

Description

[Detailed description of the device]       [0001]     [Technical field to which the device belongs]   The present invention is directed to the flow of steam from steam headers of web dryers and steam boxes. Valve that controls both the flow of air into the chamber, and more specifically the drying of the paper web. For steam boxes in web dryers that control moisture distribution across the dryer Related to control valve.       [0002]     [Prior art]   In the papermaking field, paper and cardboard are used to transfer pulp or raw material onto a moving screen. It is manufactured by supplying the jet under pressure. Pulp is usually It contains more than 95 wt% water, which is passed through the moving forming screen. It is removed by discharging. The paper web thus formed is a forming screen. Multiple press rolls to remove excess water from the paper web. It is supplied through Le. The pressed web is more dry than the pressed section. Web, which has a relatively high water content in the drying section. Supplied around a rolling drying cylinder.       [0003]   The pressure exerted on the web by the press rolls across the dryer during the pressing process Direction and the molding and drying conditions vary, The moisture content of the paper web entering the web is Varies along the direction across the dryer. The difference in the water content of such webs, i.e. the water content Distribution of coatings, if not compensated for, has different coating properties along the direction across the dryer It becomes a paper web. Further control the water content across the web dryer This allows a much higher percentage of moisture to be sold to paper rolls Will be Optimum control of web dryness across the dryer This reduces the number of sheet breaks.       [0004]   Therefore, to provide a paper web with a relatively uniform moisture content along the width However, much research has been done in the past to compensate for moisture distribution across dryers. ing. The steam box can be a suction roll or a suction box that rotates Located adjacent to the web guide rolls, the web is Pass around the guide roll with the cous. The water vapor box penetrates it The steam is supplied from a steam header extending in the longitudinal direction. Steam box It is divided into several compartments of the same size. The vapors of water vapor are selectively and individually supplied to one or more compartments. Are placed side by side across the width of the web so that they are fed There is. The water vapor in the compartment is used to carry out the drying process on the moving web. It is spread over adjacent portions of the moving web. Various width across the web A monitoring means is provided downstream of the steam box to confirm the specific water content of the part. Are arranged. Depending on the control signal supplied by such monitoring means, water vapor is generated. Qi is selectively supplied to one or more compartments of the steam box , Which compensates for irregularities in the water distribution of the moving web.       [0005]   US Patent Application No. 7 assigned to the applicant, Beloit Corporation In No. 20,482, the steam flowing from the steam header into the steam box Rather than simply providing a steam control valve to control the flow rate, the flow rate of such steam Is reduced or the flow is stopped, the corresponding volume of air It has been found to be advantageous to be introduced into the steam box. Hiding Introducing supplementary air by means of increasing the sensitivity of the moisture distribution measuring device is effective. Not only for improving the smooth flow of steam into and out of the steam box, I understood.       [0006]   The contents of the above-referenced U.S. Patent Application No. 720,482 are incorporated herein by reference. I shall.       [0007]   In the above-mentioned proposal of the above-mentioned US Patent Application No. 720,482, the flow of air is restricted. In order to control it, it was necessary to provide a second valve with an independent control means. Such first The secondary pneumatic control valve and control means introduce relatively complex control problems, resulting in manufacturing The cost is relatively high.       [0008]   The present invention overcomes the inadequacies of the above-mentioned U.S. patent application apparatus and proposes these earlier proposals. It has a significant advantage over It provides a control valve that provides significant improvements.       [0009]   One object of the present invention is to drive a first and second stepper motor. A valve stem provided with a valve closing member, and when the valve stem is driven, inside the steam box Of the flow rate of steam flowing into the steam box changes of the flow rate of air flowing into the steam box To provide a control valve for adjusting the water distribution, which is configured to be inversely proportional to.       [0010]   Another object of the present invention is to introduce a first valve for introducing steam into the steam box. When the valve is opened, the second valve that controls the air flow rate is correspondingly closed, This reduces the flow of air into the compartment of the steam box. Providing a control valve configured to.       [0011]   Another object of the present invention is to close the first valve so that the steam box When the supply of steam to the is cut off, the second valve is opened correspondingly, Providing a control valve configured to introduce more air into the steam box Is.       [0012]   Other objects and advantages of the invention include detailed description of the embodiments, the drawings, and the appended claims. Will be apparent to those skilled in the art.       [0013]     [Outline of the device]   The present invention is directed to the flow rate of steam from the steam header of a web dryer and the steam box. It relates to a control valve that controls both the flow rate of air into the chamber. Control of the present invention The valve includes a valve body having a longitudinally extending passageway therein. The passage is first And a second end, the first end being connected to and in fluid communication with the steam header. Through. The second end is connected to and in fluid communication with the air header . Control the flow rate of steam and air flow into the steam box respectively. First and second valve seats are disposed adjacent the first and second ends of the passage, respectively. It An elongated valve stem is axially movably disposed along the passage in the passage. And the valve stem has first and second ends. The first valve closing member Is located adjacent to the first end of the steam chamber and cooperates with the first valve seat to provide a steam header. The flow rate of steam flowing into the steam box has been selectively controlled. There is. A second valve closing member is provided adjacent to the second end of the valve stem, It controls the flow rate of the air that flows into the steam box in cooperation with the valve seat of Swelling. Water vapor flowing into the water vapor box when the valve stem is driven Changes in the flow rate of the air into the compartment of the steam box. Drive the valve stem axially relative to the passage in inverse proportion to A stepping motor is drivingly connected to the valve stem.       [0014]   In one particular embodiment of the invention, the first channel is bounded by the valve body. And the first channel is in the direction in which the first valve closing member moves away from the first valve seat. When moving axially to, the water vapor causes the water vapor header to move to the first valve seat and the first chamber. The first valve seat in the direction that crosses the passage so that it flows through the tunnel into the steam box. Adjacent to each other.       [0015]   Furthermore, the control valve of the present invention has a thermal strain between the steam header and the steam box. Connected to the steam header and steam box so that it is not affected by stress or stress Has been done.       [0016]   The second channel is bounded by the valve body, and the second channel is When the second valve closing member moves axially away from the second valve seat, the air A passage is provided so as to flow into the steam box through the second valve seat and the second channel. Adjacent to the second valve seat in a transverse direction.       [0017]   In another embodiment of the invention, the valve stem is located within the pneumatic cylinder. It is driven by a pneumatic diaphragm.       [0018]   In yet another embodiment of the present invention, the valve stem is axially driven by the drive of the ram. Drive source to drive the valve closing member in the valve opening direction or valve closing direction. A ram is pivotally attached to the valve stem by a linkage.       [0019]   In one preferred embodiment of the invention, the valve body is of unitary construction and It is rigidly fixed to the steam header.       [0020]   In various other embodiments of the present invention, the valve body includes first and second valve body portions. , The first valve body is fixed to the steam header, the second valve body is the steam box Fixed to.       [0021]   The present invention is limited to or attached to the detailed description of the preferred embodiments of the present invention described below. It is not intended to be limited by the drawings, but the appended claims that define the scope of the invention. It is limited by. The preferred implementation described in the detailed description of the examples. For the embodiments and various other embodiments, the scope of the invention defined by the appended claims Various modifications may be made without departing from the enclosure. In this specification, in particular, The present invention will be explained with respect to the adjustment of the water distribution of the paper web passing through the dryer. The control valve of the present invention is a steam valve for controlling the water distribution in any moving web. It will be apparent to those skilled in the art that the same may be applied to the boots.       [0022]     [Embodiment of device]   The present invention is directed to the flow of steam from steam headers of web dryers and steam boxes. Control valve for controlling both the flow of air into the chamber. More than one Control valves adjacent to the corresponding compartments of the steam box Are arranged along the width direction of the paper web.       [0023]   For the purpose of clarifying the description of the control valve of the present invention, it is provided in one compartment. The structure and operation of the steam and air control valve installed will be explained, but the present invention is applied. In doing so, a plurality of such steam and air control valves must be installed in each steam box. The paper web dryer while it is placed in its corresponding compartment. Note that they are arranged along the cutting direction.       [0024]   Like reference numerals used in the accompanying drawings refer to various embodiments of the present invention. The same member is shown.       [0025]   FIG. 1 shows a web guide roll, ie a suction roll or a suction box 10. The paper web W is guided while being wound around the guide roll 10. It has become. A water vapor box generally indicated by reference numeral 12 is a guide roll. 10 extends in the longitudinal direction along the width direction of the water vapor box 10, and the water vapor boxes 12 are transverse to each other. It is divided into a plurality of compartments arranged in a direction. Such compar One of the compartments 14 is shown in FIG. The diffusing plate includes a web w that guides between the guide roll 10 and the diffusing plate 16. Has a shape very close to the peripheral shape of the guide roll 10 so that the guide roll 10 can move together. are doing. A longitudinally extending water vapor header 18 is provided for each compartment. Through the water vapor box 12 so that it extends through There is. FIG. 1 shows a steam header 18 extending through compartment 14. ing. Compartment 14 includes a backboard 20 and is designated by the numeral 22 of the present invention. A generally shown control valve is located between the back plate 20 and the steam header 18. . A valve drive, generally designated by the numeral 24, is rigidly fixed to the back plate 20. It       [0026]   FIG. 2 is one preferred control valve of the present invention, generally indicated at 22 in FIG. It is sectional drawing which shows a new Example. The control valve 22 is the steam header 18 of the web dryer. Flow of steam shown by arrow S and arrow flowing into steam box 12 Control both of the air indicated by A.       [0027]   Control valve 22 includes a valve body generally indicated at 26, which valve body It is arranged adjacent to the steam box 12. In the particular embodiment shown in FIG. In this case, the valve body 26 has a structure in which it is arranged between the back plate 20 and the steam header 18. In this state, it is rigidly fixed to the steam header 18.       [0028]   The valve body 26 defines a passage 28 extending in the longitudinal direction. Passage 28 is the first It has an end 30 and a second end 32, the first end 30 having a steam header 18 To and in fluid communication with. Similarly, the second end 32 is an air header 19 and is in fluid communication therewith. To steam box 12 The first valve seat 34 and the second valve seat 34 for controlling the flow rates of the incoming steam S and air A A valve seat 36 is proximate to the first end 30 and the second end 32 of the passage 28, respectively. It is arranged.       [0029]   An elongated valve stem 38 is axially movably disposed along the passageway 28. Have been. The valve stem 38 has a first end 40 and a second end 42.       [0030]   Flows from the steam header 18 into the steam box 12 in cooperation with the first valve seat 34. The first valve closing member 44 for selectively controlling the flow rate of the steam S Is provided adjacent to the end portion 40.       [0031]   Similarly, the flow of the air A flowing into the steam box 12 in cooperation with the second valve seat 36. Adjacent the second end 42 of the valve stem 38 is a second valve closing member 46 for selectively controlling the amount. It is provided in contact.       [0032]   When the valve stem 38 is driven, the flow rate of the steam S flowing into the steam box 12 Change in the flow rate of the air A flowing into the compartment 14 of the steam box The valve stem 38 selectively axially relative to the passage 28 so as to be inversely proportional to A driving stepping motor 48 is drivingly connected to the valve stem 38.       [0033]   As shown in FIG. 2, the valve body 26 has a first channel defined by it. It has a rule 50 inside. This first channel 50 is transverse to the passage 28. Is provided adjacent to the first valve seat 34, and thereby the first valve closing member 44 is provided. When moving axially away from the first valve seat 34, the steam S The steam box 12 from the valve 18 through the first valve seat 34 and the first channel 50. It is designed to flow in.       [0034]   The second channel 52 is bounded by the valve body 26, and the second channel The channel 52 is provided adjacent to the second valve seat 36 in a direction transverse to the passage 28. This causes the second valve closing member 46 to move away from the second valve seat 36 in the axial direction. The air A, the water moves through the second valve seat 36 and the second channel 52 into water vapor. It is intended to flow into the compartment 14 of the box.       [0035]   The stepper motor 48 is threadedly engaged with a control rod 54 extending therethrough, It is designed to work with this. The control rod 54 is a stepping motor 48. Is driven, the control rod 54 is driven in the axial direction by the stepping motor 48. To drive the valve stem 38 axially relative to the passage 28. The flow of steam S and air A flowing into the compartment 14 of the steam box A valve stem 38 is connected for control.       [0036]   More specifically, in FIG. 2, the second valve seat 36 is located at the second end 32 of the passage 28. An independent inner surface that is fixedly mounted adjacently by a C-ring 56 has a tapered shape. Shown as a ring.       [0037]   In contrast, the first valve seat 34 is screwed into the first end of the passage 28 and secured. The axial direction of the first valve seat 34 with respect to the first valve closing member 44. The position can be adjusted. Adjustment of the position of the first valve seat 34 is performed by a screw. The cutout 58 is used.       [0038]   The valve body 26 includes a flange 60 which allows the valve body 26 to have a steam To cooperate with the annular seal 62 for sealing engagement with the back plate 20 of the box 12. ing. As a result, the back plate 20 is heated without causing stress in the valve body 26. It can deform due to stress. As shown in FIG. 2, the valve body 26 A threaded portion 64 is included, the valve body 26 and the stepper motor 48 including a threaded portion. The inner thread of the steam header 18 is fixed so that it is firmly fixed to the steam header 18. It is designed to work with mouth 66.       [0039]   FIG. 3 shows a second embodiment of the invention similar to the embodiment shown in FIG. In particular, it shows another means for fixing the valve body to the back plate of the steam box. It       [0040]   It should be noted that throughout the various embodiments of the present invention, similar members are designated by alphabetical suffixes. Six is indicated by the same reference numeral added.       [0041]   More specifically, FIG. 3 shows the valve body 26A. The valve body 26A has a seal groove 2 9A is defined, and the seal groove engages the valve body 26A with the header 18A for sealing engagement. However, the header 18A changes due to thermal stress without imposing stress on the valve body 26A. It is adapted to cooperate with the annular face seal 31A so that it can be shaped.       [0042]   Further, FIG. 3 shows a valve stem having a first valve closing member 44A and a second valve closing member 46A. 38A is shown. The valve body 26A contacts the shoulder portion 61A of the orifice 63A of the back plate. Includes abutting peripheral flange 60A.       [0043]   As shown in detail in FIG. 4, which is a cross-sectional view taken along line 4-4 of FIG. Collars 73A, 75A, 77A, 79A are the outer peripheral edge 8 of the flange 60A. 1A, 83A, 85A, 87A, which allows the valve body 26A to engage the back plate 20A. Bolts 65A, 67A, 69A, 71A having screws to be fixed to the back plate. It is screwed to 20A.       [0044]   FIG. 5 shows a third embodiment of the present invention. In this embodiment, the valve body 26 B is the first valve body 89B rigidly fixed to the steam header 18B and the steam valve And a second valve body 91B rigidly fixed to the back plate 20B of the box. . The pneumatic diaphragm type drive device 93B including the pneumatic diaphragm 94B is shown in FIG. This drive has a valve stem 38B with a first valve seat 34B and a second valve seat 38B. Drive control rod 54B to move axially relative to valve seat 36B It has become. Drive device 93B is a registered trademark called "BELLOFRAM" It may be of the type sold.       [0045]   The control rod 54B can push the valve stem 38B, but Is not connected. The valve stem 38B resists the control rod 54B by a spring 39B. Has been pressed.       [0046]   FIG. 6 shows a fourth embodiment of the present invention in which the second valve closing member 46C includes an extension portion 95C. are doing. The extension portion 95C defines a bore 97C, which is a stud 99C. With the second valve closing member 46 coaxially with the valve stem 38C. It is supposed to guide C. The second valve closing member 46C includes a steam header 18C and The valve stem 38C is flexibly connected so as to absorb thermal stress and deformation between the back plate 20C and the back plate 20C. Has been continued.       [0047]   FIG. 7 shows a fifth embodiment of the present invention. In this embodiment, the steam head is Flow rate of steam S flowing from compartment 18 into compartment 14D of the steam box Is the axis of the valve stem 38D with respect to the port 101D of the first lateral channel 50D It is controlled by the linear position. Bounded by the valve body 26D Port 101D has a steam header 18 when valve stem 38D opens port 101D. It is in fluid communication with D.       [0048]   FIG. 8 is a sixth embodiment of the present invention including a second valve body portion 91E having a substantially cylindrical shape. An example is shown. The piston type second valve closing member 46E is the end of the control rod 54E. Rigidly connected to. The air intake port 103E is surrounded by the second valve body 91E. And the second valve closing member 46E is axially directed toward the steam header 18E. When driven, the air intake hole 103E is opened, whereby the air intake port 103E is opened. And a plurality in fluid communication with the interior of compartment 14E of the steam box The air A is allowed to flow through the holes 105E.       [0049]   FIG. 9 shows a seventh embodiment of the present invention. In this embodiment, reference numeral 113 The second of the link arms 111F pivotally attached to the back plate 20F at the position indicated by F A ram 107F pivotally attached to the end 109F of the valve stem 38F causes the valve stem 38F to It is designed to be driven relative to F. First of the link arm 111F End 115F is pivotally attached to connecting device 119F at the position shown at 117F. Have been. The connecting device 119F is connected to the first end 115F of the link arm 111F and the valve. The stem 38F extends between the second end 42F.       [0050]   FIG. 10 shows that the first end portion 30G of the passage 28G has a flexible bellows 121G. 8 shows an eighth embodiment of the present invention connected to a steam header 18G. Bello 121G allows deformation and thermal stress between the steam header 18G and the back plate 20G. I do.       [0051]   In the operation of the control valve 22 according to the present invention shown in the above eight embodiments, the steam The drive device 24 drives the valve stem 38 so that the air S is introduced into the compartment 14. Are driven in the axial direction relative to the valve body 26. Conversely, the valve stem 38 When driven toward the saddle 18, the second valve closing member 46 separates from the second valve seat 36. Which causes the flow of air A to be introduced into compartment 14.       [0052]   The present invention has the same flow rate of steam and air flowing to the steam box of the web dryer. Provides a unique means to control from time to time, as well as independent steam and air control It eliminates the need for valves and associated independent controls. Well Various control means used to attach the control valve to the steam header and back plate. Allows deformation and thermal stress between the steam header and the back plate of the steam box. , These enable efficient operation of the control valve that controls the flow rates of steam and air at the same time. Obstruction is avoided.       [0053]   The control valve of the present invention has a large structure of the device for adjusting the water distribution in the direction across the dryer. Not only is it simpler, but water vapor flows between adjacent compartments. And avoid.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a water distribution adjusting steam box showing a web guide roll, a paper web, a steam header, and a control valve according to one embodiment of the present invention. FIG. 2 is a sectional view showing a control valve and a stepping motor according to a preferred embodiment of the present invention; 3 is a cross section of a control valve and a stepping motor having the same valve body mounting structure as the control valve and the stepping motor shown in FIG. 2 but different from the valve body mounting structure shown in the embodiment of FIG. 2; FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3 showing the means for mounting the valve body in the steam box. FIG. 5 shows a third embodiment of the present invention in which a valve body includes a first valve body portion fixed to a steam header and a second valve body portion fixed to a back plate of the steam header. There is. FIG. 6 includes first and second valve stem portions flexibly connected to each other, wherein guide means provided on the second valve stem prevent rotation of the second valve stem portion. 4 shows a fourth embodiment of the present invention. FIG. 7 shows a device according to the present invention wherein a first valve closing member includes a port defined by a first end of a valve stem, the port configured to cooperate with a first lateral channel of the valve body. 5 shows a fifth embodiment. FIG. 8 illustrates a sixth embodiment of the present invention in which the second valve closing member is a piston configured to control the flow rate of air flowing into the steam box in cooperation with the second valve body. Is shown. FIG. 9 shows a seventh embodiment of the invention in which the valve stem is driven axially by a ram and an intervening link mechanism. FIG. 10 shows an eighth embodiment of the present invention constructed similarly to the embodiment shown in FIG. 9 and incorporating a specific bellows structure connecting the first end of the passage to the steam header. I have. [Explanation of Codes] A ... Air S ... Steam W ... Web 10 ... Guide roll 12 ... Steam box 14 ... Compartment 16 ... Diffusion plates 18, 18A, 18B ... Steam header 20, 20A, 20B ... Back plate 22 ... Control valve 26 , 26A ... Valve body 28 ... Vertical passage 30 ... First end 32 ... Second end 34 ... First valve seat 36 ... Second valve seats 38, 38B, 38C, 38F ... Valve stem 40 ... 1st end part 42 ... 2nd end parts 44, 44A ... 1st valve-closing part 46, 46A ... 2nd valve-closing part 50 ... 1st channel 52 ... 2nd channel 60, 60A ... Flange 61 ... Shoulder 63 ... Orifice 65A, 67A, 69A, 71A ... Bolts 73A, 75A, 77A, 79A ... Collar 81A, 83A, 85A, 87A ... Peripheral edge 91 ... Valve body 95 ... Extension 97 ... Bore 101 ... Port 1 03 ... Air inlet 107F ... Ram 109F ... Second end 111F ... Link means 115F ... First end 119F ... Connecting means 121G ... Bellows

Claims (1)

[Scope of utility model registration request] 1. A control valve (22) for controlling both the flow of steam from a steam header (18) and the flow of air from an air header fed to a steam box (12) of a web dryer, said steam box (12) A valve body (26) disposed proximate to the steam header (18) for controlling the flow of steam and air into the steam header (18) and connected to the steam header (18) bounded by the valve body (26). A longitudinal passageway (28) having a first end (30) and a second end (32) connected to the air header, and steam and air flow to the steam box (12). First and second valve seats (34, 36) disposed proximate to each of the first and second ends (30, 32) of the longitudinal passageway (28) to control the respective. , First and second ends (40, 42 And an elongate valve stem (38) disposed axially movable within and along the longitudinal passage (28); and the steam header in cooperation with the first valve seat (34). A first valve closing portion (44) disposed proximate to the first end (40) of the valve stem (38) to control the flow of steam from the (18) to the steam box (12). )
And the valve stem (3) to cooperate with the second valve seat (36) to control the flow of air to the steam box (12).
8) a second valve closing portion (46) arranged in close proximity to the second end (42), and steam to the steam box (12) in response to movement of the valve stem (38). To selectively move the valve stem (38) axially with respect to the longitudinal passage (28) such that a change in airflow is inversely proportional to a change in airflow through the second valve seat (36). A valve drive (24) drivingly connected to the valve stem; and the valve closing portion (4) for each of the valve seats (34, 36).
4, 46) and the steam box (12) to flexibly seal the valve body (26) with respect to the steam box (12) so that the relative position of the steam box (12) is maintained regardless of deformation due to heat. A valve device including a sealing device (62) disposed between the valve body (26). 2. The valve body (26) is provided with the steam box (12).
The valve device according to claim 1, wherein the valve device is disposed in the utility model. 3. The valve body (26) has a first channel (50) formed in the valve body, the first channel proximate the first valve seat (34) and the longitudinal passage (50). 2
8) is arranged at a right angle to the steam header (18) when the first valve closing portion (44) moves axially away from the first valve seat (34) in the axial direction. ) Through the first valve seat (34) and the first channel (50) to the steam box (12)
The valve body (26) further has a second channel (52) formed therein, the second channel (52) being adapted to flow into the second valve seat (52). 3
6) is disposed at a right angle to the longitudinal passageway (28), and the second valve closing portion (46) moves axially in a direction away from the second valve seat (36). The utility model registration claim 2 wherein air then flows from the air header through the second valve seat (36) and the second channel (52) into the steam box (12). Valve device. 4. 4. The valve device according to claim 3, wherein said valve body (26) has an integral structure. 5. The valve body (26) is provided with the steam header (18A).
A utility model registration having a first valve main body (29A) rigidly fixed to the water vapor box (12) and a second valve main body rigidly fixed to the steam box (12). Item 3. The valve device according to Item 3. 6. The valve driving device (24) includes a stepping motor (48) fixed to the valve body (26), and a screw-type engagement with the stepping motor, and the stepping motor rotates when the stepping motor rotates. A control rod (54) moving in the axial direction, and moving the valve closing portion (44, 46) relative to the first and second valve seats (34, 36) when the stepping motor rotates. 2. A valve device according to claim 1, further comprising a connecting means for connecting said control rod (54) to said valve stem (38) to enable said control rod to be connected to said valve stem (38). 7. The valve drive (24) is pivotally connected to the valve body (26) for first and second ends (115F, 1F).
09F) and a first end (115F) of the link means extending between the first end (115F) of the link means and the valve stem (38F). A connecting means (119F) pivotally connected to the link means (111F) and a second end (109F) of the link means (111F) pivotally connected to the link means (111F) and the connecting means (119F). Working together, the valve stem (38
F) with a ram (107F) pivotally connected to the second end (109F) of the link means (111F) for axial movement of the F) relative to the first and second valve seats. The valve device according to claim 1 of the utility model registration claim.