TWI316997B - Vacuum gate valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a gate valve, and more particularly to a valve plate for closing an opening. [Prior Art] In the prior art, there are many embodiments of vacuum gate valves known to be used to close an opening in a container or pipe. L-type vacuum gate valves are primarily used in I C and semiconductor manufacturing. Such fabrication must occur in a protected environment to minimize the presence of contaminating particles. For example, in a semiconductor or liquid crystal cell manufacturing unit, a high-sensitivity semiconductor or liquid crystal cell passes through a plurality of manufacturing chambers, each of which is connected to a next manufacturing chamber through a passage, and the passage is opened by a vacuum gate valve, so that the parts can be removed from one The manufacturing chamber is sent to the next manufacturing chamber and is then hermetically closed so that the next manufacturing step can proceed. Figures 1 a, 1 b and 1 c show a prior art vacuum gate valve, but not to scale. Figure 1 a shows the vacuum gate valve in its open position. The vacuum gate valve includes a valve housing 1 having a valve housing 1 having a wall 2 and an opening 3 for opening 3. The opening 3 can be closed. A valve seat 4 (made as a flat or tapered surface) surrounds the opening 3 with or without a seal. As shown in Fig. 1a, in the original position where the vacuum gate valve is opened, a valve plate 5 is adjacent to the opening 3, adjacent to the wall 2, and the shape of the valve plate 5 (specifically rectangular) overlaps the opening 3 so that the opening 3 can The entire sealing surface 7 of the valve plate 5 is closed. The valve plate 5 is provided on a valve stem 8 which defines a valve stem axis 11 . Instead of a single valve stem 8, a two parallel valve stem can be used. The manner in which the valve plate 5 is attached to the valve stem 8 will be discussed in more detail below. As shown in Figures lb and 1c, the valve stem 8 can be controlled in two degrees of freedom by means of the control element 10,

Page 5 1316997_ V. Description of the invention (2) For example, a hydraulic and swivel unit. More specifically, the valve stem 8 is linearly movable along the stem axis 1 1 and is rotatable in a plane perpendicular to the wall 2. Close the opening 3 in the next two steps. The first step occurs between the two cases shown in Figures 1 a and 1 b. In the first step, as indicated by arrows 2 8 a and 2 8 b, the valve stem 8 is brought along the valve stem by the control element 10 The axis 1 1 extends such that the valve plate 5 traverses the opening 3 along a path substantially parallel to the wall 2 while avoiding the valve plate 5 contacting the wall 2 of the valve housing 1 or the valve seat 4. The second step occurs between the two cases shown in Figures 1 b and 1 c. In the second step, as indicated by the arrow 2 8 c, the valve stem 8 is deflected by the control element 10 to the wall 2, so that the valve plate The sealing surface 7 of 5 (possibly supporting a sealing ring) presses against the valve seat 4 and closes the opening 3 tightly, if possible, airtightly. For example, to be sealed, it may be provided on the sealing surface 7 of the valve plate 5 and pressed against the sealing ring of the valve seat 4 surrounding the opening 3, or by the sealing surface 7 of the valve plate 5 provided on the valve seat 4. The sealing ring that lives. By means of the valve seat 4, it is understood that the sealing surface 7 of the valve plate 5 presses against the opposite side of the wall 2 and thus achieves a seal. Different sealing devices are known from prior art (for example U S 6 6 2 9 6 8 2 B 2 ). For example, an elastomeric sealing material having the trade name V i t ο n R is a suitable material for the sealing ring. Considering the closing operation occurring in two steps, the sealing ring is hardly subjected to any shearing force which may destroy it, and the valve plate 5 is moved substantially perpendicularly to the valve seat 4 due to the rotation of the valve stem 8. Various control elements 10 are known from the prior art, each of which may result in a slightly different control direction of the valve stem 8 and the valve plate 5. therefore,

The absolute linear movement of the valve plate 5 perpendicular to the wall 2 can be enabled to replace the arcuate rotational path from the valve plate 5 to the valve seat 4. There are various embodiments of vacuum gate valves of the above type, such as U.S. Patent 6 4 3 1 5 1 8 Β 1 , 5 4 1 5 3 7 6 A, 5 6 4 1 1 4 9 A

1316997 V. INSTRUCTIONS (3) > 6 0 4 5 1 1 7 A ' 5 9 3 4 6 4 6 A ' 5 7 5 5 2 5 5 A ' 6 0 8 2 7 0 6 , 6095180 and 6627682 B2 °

A particular problem seen in the prior art is the alignment of the valve plate 5 with the valve housing 1. It should be observed that, on the one hand, in the first step of traversing the valve plate 5 across the opening 3, the sealing surface 7 should be prevented from contacting the wall 2 or the valve seat 4, as this contact may result in damage to the sealing surface or the sealing ring. Further, in the second step (pressure application), the valve plate 5 must be accurately aligned with the valve seat 4, otherwise the sealing surface 7 of the valve plate 5 does not reach the exact position on the valve seat 4. When applying pressure, it is important that the plane of the sealing surface 7 is parallel to the plane of the valve seat 4, in particular when the long valve plate 5 is used, otherwise it will be unevenly pressed against the sealing surface 7 along the valve seat 4, The aspect causes insufficient tightness and on the other hand causes damage to the sealing material. Further, the valve plate 5 and the valve stem 8 may be subjected to bending and torsion forces. For this purpose, most of the control elements known from the prior art have suitable control mechanisms for accurately aligning the valve stem 8 and thus for accurately aligning the valve plate 5°. For example, a connection 9 of the valve stem 8 is introduced into one of the valve plates 5 The receiving portion 6 forms a connection between the valve stem 8 and the valve plate 5. There are a number of fastening methods, such as those described in U.S. Patent Nos. 6,068,180 and 6,,,,,,,,,,,,,,,,

In U.S. Patent 6 6 1 9 6 18, a vacuum gate valve has a valve plate having a non-uniform wall thickness, i.e., the center is thicker than both sides. In the middle (thick-walled area), there is a semi-circular receiving portion to receive a valve stem, and the wall thickness between the receiving portion and the sealing surface is greater than the wall thickness between the receiving portion and the opposite surface of the sealing surface. The valve stem has a connection at its end which is also semi-circular and is guided as a receiving portion. A bolt is locked from the opposite side of the sealing surface to secure the valve plate to the valve stem. In the above

Page 7 1316997 V. INSTRUCTIONS (4) The design of the valve plate, the receiving portion and the connecting portion is intended to prevent excessive bending of the valve plate (especially on both sides of the long valve plate) when the valve plate is pressed against the valve seat, but does not need More than one shaft or a thicker valve plate. At certain times, the valve plate should be controlled or repaired, especially to check or replace the seal ring to ensure that the vacuum gate valve remains tight. With the vacuum gate valve known from the prior art, it is difficult to disassemble and install the valve plate, and the valve plate can be removed from the valve stem by removing the valve plate from the valve shaft, and the mounting bolt is removed and the valve plate is removed from the valve stem. It is difficult. Due to the poor ergonomics of the valve plate, there is no safe disassembly to damage the valve plate or the valve housing (especially the valve seat).

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a vacuum gate valve having a connection between a valve stem and a valve plate to provide a rotational capability for adapting the alignment of the valve plate around the axis of the valve stem. The type of seat has high reliability, simplified handling and maintenance, and simple part design. A secondary object of the present invention is an annular bearing portion disposed at the receiving portion and the connecting portion that allows the valve plate to at least partially rotate relative to the valve stem about the stem axis such that at least the valve plate is firstly When pressed against the valve seat, the alignment of the valve plate about the stem axis will accommodate the valve seat.

Still another object of the present invention is to provide a restricting portion disposed at the receiving portion and the connecting portion, which limits the rotation allowed by the annular bearing portion to an angular range such that the valve plate traverses the opening, the valve housing Do not touch the valve plate. The invention is based on the idea of providing a vacuum gate valve having a connection between the valve stem and the valve plate to provide a rotational force to cause the valve plate to be on the valve stem shaft

Page 8 1316997_ V. INSTRUCTIONS (5) The alignment around the line can be adapted to the seat, at least for the first time. In this way, a lengthy pre-alignment of the valve plate is not required. The ability of the device to limit rotation when the valve plate traverses the opening prevents the valve housing from contacting the valve plate. Further, the present invention provides the possibility of disassembling and unloading the valve plate from one side of the valve plate, thereby greatly simplifying the maintenance of the vacuum gate valve. The valve plate and valve stem according to the present invention achieve this purpose. The following is an overview of the invention. The vacuum gate valve of the present invention includes a valve housing having a wall, an opening in the wall, and a valve seat surrounding the opening. For example, the opening has a rectangular cross section with four rounded corners. By the valve seat, one wall (as a sealing surface) is pressed by the other surface (as a sealing surface). The wall may form the shell. The opening can be closed by a valve plate. For example, the valve plate has a rectangular cross section and a sealing surface sized to enable the valve plate to cover and close the opening. In a possible embodiment, a sealing ring is secured to the edge of the sealing surface for application to the valve seat. The valve plate is detachably mounted on a valve stem. The valve stem is supported and adjusted by the control element of the vacuum gate valve such that the valve plate can traverse the opening along the axis of the valve stem and the cover of the valve plate can press against the valve seat to close the opening. It is known from the prior art that there are many ways to implement a control element to adjust the valve stem and the valve plate in this manner. According to the invention, in the valve plate (more specifically in one of the two faces of the valve plate), there is a receiving portion having a connecting portion at the end of the valve stem, the connecting portion having a shape corresponding to the shape of the receiving portion, The connecting portion can be introduced into the receiving portion. The shape of the receiving portion and the connecting portion are such that they together become an annular bearing portion and a restricting portion (restricting the corner of the valve plate). An annular bearing portion allows the valve plate to at least partially rotate relative to the valve stem about the stem axis. It can be made into a simple neck bearing or roller bearing.

T3T6997_ V. INSTRUCTION DESCRIPTION (6) Therefore, when the valve plate is pressed against the valve seat, the alignment of the valve plate around the valve stem axis may be adapted to the valve seat. Therefore, the valve plate becomes parallel to the valve seat with respect to a plane perpendicular to the axis of the valve stem such that the contact pressure at both ends of the valve plate is the same. In this way, uneven pressure and varying seal gaps are avoided without having to provide a highly accurate fit in advance. The restriction limits the allowable rotation of the annular bearing portion to a defined angular range such that the valve housing does not contact the valve plate when the valve plate traverses the opening, and an excessive angle of rotation may cause the valve housing to contact the valve plate . However, an accurate pre-alignment around the axis of the valve stem can be omitted as the valve plate self-aligns as it moves. The annular bearing portion and the restricting portion can be formed as two separate portions or an element capable of achieving two functions. [Embodiment] The apparatus of the present invention will be described in more detail with the aid of several specific embodiments of the exemplary embodiment shown in the drawings, and other advantages of the present invention will be discussed. Part* describes individual symbols* is still used for component symbols used in diagrams described earlier, and some views are discussed in the content. Figures 1a, 1b, and 1c show the operation of a typical vacuum gate valve that has been discussed in the prior art. In the subsequent figures, a part of the component symbols introduced in the 1a, 1b, and 1c diagrams will be used. 2A, 2b, 3a, 3b, 4a, 4b, and 5 show the same embodiment of the vacuum gate valve of the present invention in different fields of view, different figures, and different levels of detail, These figures will be described together below, although sometimes only a certain figure is mentioned. The components that are invisible from the outside in the figure are shown in dotted lines.

Page 10 As shown in the figure, there is an opening. 3 The vacuum gate valve has a valve housing 1 and the valve housing 1 has a valve stem S. A valve seat 4, and the valve seat 4 surrounds the opening 3.兮古< 2, wall 2 ring 32 to close the opening I5 has a - sealing surface 7, · cover 7; i between the two sides of the sealing surface), l / j. In the middle of one of the two wide sides of the valve plate 5, the connecting portion 9 p of the sealing rod 8 is opposite to the receiving portion 6 by a connecting portion of the valve stem 8, and the plate 5 is detachably provided. Valve 椁8, connected to Λβ〇. By means of the valve control mechanism = and = rod seals the second Ξ;: ^ axis (1) to close, seal r to the valve seat 4 and press the valve plate 5. In the cover portion 12' and the 6th portion of the cover 7, the second and second portions form a two-function portion, that is, a 1 2 branch P"/knife 3 (restriction portion) to restrict the corner. The 搽 shaft allows the plate 5 to rotate around the valve stem axis with respect to the valve stem 8 = the bearing portion is at least when the valve plate 5 is first placed on the valve seat 4, and the fourth knife is rotated so that the alignment is adapted to the valve seat 4. In the example, the plate r5, the receiving portion 6 of the valve shaft axis 于 on the valve plate 5, includes a round shaft 12 & the formed bearing portion 12 is formed 12a is formed at the connecting portion 9 of the valve stem 8, the circular hole 圆 - the circular hole 12b, The circular shaft shaft 1 2 a. The circular shaft 1 2 a is slidably pivoted in the circular hole in the valve plate 5) The clearance fit or the transition fit (trans· 2b, in the gap fit generation scheme, the rotation is available The bearing replaces the ti〇n fit. In the alternative, it is used as a ring bearing. "" bearing or simple neck bearing, with the second function, that is, the restriction portion 13, the rotation of the a-shaped bearing portion 12

Page 11 I1I6997

V. INSTRUCTIONS (8) Restricted in a range of 4 to above the opening 3, the valve casing is wide and the W is so that the diaphragm 5 is moved into contact with the valve plate 5). In the example of the valve body 5 (the valve illusion portion and the inner polygon portion m), the restricting portion 13 has an outer polygonal inner polygonal portion formed on the outer peripheral portion of the valve plate at the connecting portion 9 of the valve stem 8. The ridge portion is larger than the outer ridges 6 to fit the outer polygonal portion. The inner inner polygon portion is inner rotator limited to the range 14 . Here, the polygonal portion is an outer quadrilateral ^ jl3b having at least two parallel faces l3b , a polygonal shape, an outer polygonal portion; a, having a parallel surface 1 3a'. However, the inner or pentagon portion has other embodiments. For example, = round or oblique, as shown in the figure: The angle between the edge and the edge of the edge #' can be:] the connection portion of the valve stem 8 is not in the embodiment. Therefore, the axis of the rod is 丨i. The center has a central screw hole 丨 5 ' In addition, along the axis of the valve stem, the screw hole 15 will be referred to as the first spiral between the side 丨7 of the joint 6, 'in the valve plate 5, at the receiving portion 6 and Phase 5. 1 = Locked into the first screw hole 15, with a perforation 16, a bolt 18 can be removed by abutting against the bearing bore axis 11. The valve plate 5 can be fixed to the valve perforation Locked to avoid loss of wear = there is an anti-sinking hole to accept the screw plug 1 and can be locked to the valve stem 8 along the 8th. As in the ja and 5: bolts, other bolts can be selected ^^, The head of the bolt 18 has six sides. The broken bolt is not shown in the recess of the other fixing device. When it is in the valve stem 8, the connecting portion, in an alternative embodiment, the cloth, the ten, the receiving portion, and the wearing The intermediate plate 5' is replaced by another embodiment. [In addition, with - longer 1316997_5, invention description (9) On the side opposite to the side of the receiving portion 6, the valve plate 5 has a screw hole 2 1 , Hereinafter, it will be referred to as a second screw hole 2 1. The second screw hole is in a central portion, adjacent to the through hole 16. With the second screw hole 2 1 , a tool can be locked into the second screw hole 2 1 and thus The valve stem 11 is biased upward by the valve plate 5, and after the bolt 18 is loosened, the valve plate 5 is brought away from the valve stem 8. Therefore, the bolt 18 is loosened by the second screw hole 2 1 and then lifted, Only by interference from the side 107, the valve plate 5 can be taken away from the valve stem 8 so that the valve plate 5 can be repaired (for example). Here, the bolt 18 is made of an A 1 1 e η bolt, which There are related wrenches , the width between the two sides is smaller than the small diameter of the second screw hole 2 1 of the valve plate 5, so that the width of the six-sided pin of the width between the two sides of the bolt 1 8 can pass through the Two screw holes 2 1. It is understood that the screw holes are usually internal threads, regardless of how they are formed. In the embodiment of the vacuum gate valve shown in the figures, the valve housing 1 has a working opening 30 (Fig. 4b) at the top, removed A cover 29 (Figs. 4a and 4b) can open the working opening 30. Through this working opening 30, the bolts 18 can be easily and ergonomically loosened and the valve plate 5 can be removed from the valve 8. Lift up (and thus remove the entire valve plate 5). In order to better handle the valve plate during disassembly, there are two handle recesses 19 (for example) in the side 20 opposite the sealing surface 7, so that the valve plate 5 can be applied upwards from the valve stem 8 lifted up and/or easier to manipulate the valve plate 5 after disassembly. For better grip, a slip-stop coating can be placed in the recess 9 of the handle. Fig. 6a and Fig. 6b are cross-sectional views of the restricting portion 13 which are perpendicular to the stem axis 1 1 . The valve casing 1, the wall 2, the valve plate 5, the valve stem 8 and the portion of the restricting portion 13 are shown, and the restricting portion 13 has the parallel surface 1 3 a ' of the outer quadrangular portion 1 3 a of the valve stem 8 and the valve plate 5 The parallel inner face 1 3 b ' of the inner quadrilateral portion 1 3 b. Observable, relatively external

Page 13 1316997_ V. DESCRIPTION OF THE INVENTION GO) The rib portion 13a has an inner dimension 13b having an oversize. The inner and outer quadrilateral portions may have a square cross section with the same side length or different side lengths (as in the embodiment shown). This large size may be the same in two dimensions (as shown) or different. Fig. 6a shows the valve plate 5 at its center position, and Fig. 6b shows the maximum angular range of 14 limited to the restriction portion 13. This large size is such that the maneuverability is limited to the angular range 14 in which the sealing surface 7 cannot contact the wall 2 (especially the valve seat 4). Of course, it is possible to make the angular range 14 4 much smaller than in the embodiment shown in the figure. In one aspect, the smaller the angular range 14 is, the better the angle may be caused by the first application, but on the other hand, the angular range 14 must be large enough to allow the valve plate 5 to be freely aligned in the application. . Figure 7 shows the multi-tool 2 2 with which the valve plate 5 can be placed on the valve stem 8 of the vacuum gate valve or the valve plate 5 can be removed from the valve stem 8 of the vacuum gate valve. By locking the multi-tool 2 2 into the screw hole 2 1 and applying an upward force, the bolt 18 can be loosened and the valve plate 5 can be withdrawn from the valve stem 8. The multi-tool 2 2 has a handle 2 3 for applying an upward force and a torque, and a long shaft 24 having a first end connected to the handle 23. The other end of the long shaft 24 has an outer hexagonal portion 26 at the end thereof, so that a torque can be applied to the bolt 18. Next to the outer hexagon portion 26 is an external thread 27 which is used to screw the second screw hole 2 1 of the valve 2 . With the multi-tool 2 2, we can apply force to the valve plate 5 along the valve axis 1 1 to lift it from the valve stem 8. The wrench of the outer hexagon portion 26 has a size corresponding to the bolt 18, and therefore, the width between its two corners is smaller than the small diameter of the outer thread 27 (corresponding to the thread of the second screw hole 21). Even if the above-mentioned annular bearing portion and the restricting portion are not used, the above-described vacuum gate valve, valve plate 5 and multi-function tool 2 2 can be used, from the ergonomic point of view, the second screw hole 2 1 , the handle recess portion 19 , the bolt 1 8 and multi-tool 2 2, this

Page 14 1316997_ V. INSTRUCTIONS (π) The invention achieves considerable improvements in the prior art. Figs. 8a, 8b and 8c show the operation of detaching the valve plate 5 from the valve stem 8. In the first step (Fig. 8a), the multi-tool 2 2 is placed on the bolt 18 through the open working opening 30, and the stem axis 1 1 is followed by the arrow 3 1 a, and the multi-tool 2 is turned. 2, loosen the bolt 1 8 by the outer hexagonal part 2 6 . In the second step (Fig. 8b), the multi-tool 22 is locked into the second screw hole 2 1 by the external thread 27 by the arrow 31b. In the third step (Fig. 8c), the manpower is applied upwards (following arrow 3 1 c ), thereby lifting the valve plate 5 from the valve stem 8 and removing the valve plate 5 from the vacuum gate valve through the working opening 30. . The handle recess 19 allows us to lift the valve plate 5 from the valve stem 8 without having to open the working opening 30, when the bolt 18 has been released and enters the handle recess 19 and removes it from the valve housing 1. In this case, the inlet and outlet of the valve plate 5 are performed on the side 20 opposite to the sealing surface 7, for example, through an opening in the valve casing 1 opposite to the opening 3, as shown in Fig. 4b.

Page 15 93 93⁄4 ' [Simple description of the diagram] Figure 1 a, Figure 1 b and Figure 1 c show the operation of a typical gate valve ° 2 a and 2 b to the bottom and back The figure shows a valve plate. Figure 3a and Figure 3b show a connection of a valve stem in a side view and a top view. Figure 4a is a cross-sectional opacity diagram of a vacuum gate valve with the valve plate installed. Figure 4b is a section of the vacuum gate valve opaque® with the valve plate removed. Fig. 5 shows the receiving portion and the connecting portion in detail. Figure 6a is a cross-sectional view of the portion that cuts the corner, the valve plate is placed in the middle. Figure 6b is a cross-sectional view of the portion that cuts the corner, showing the possible range of rotation of the valve plate. Figure 7 shows a multi-tool that can be removed and installed. Fig. 8a, Fig. 8b and Fig. 8c show the operation of removing the valve plate with the multi-tool. 简单 [Simple description of the figure] 1 Valve housing 2 Wall 3 opening 4 Seat 5 Valve plate 6 Receiving part 7 Sealing surface

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Claims (1)

1316997_ s. Patent Application No. 1, a vacuum gate valve, comprising: a valve housing having an opening and a valve seat surrounding the opening; a valve plate having a receiving portion and a sealing surface to close the opening; and a valve a rod having a connecting portion inserted into the receiving portion to set the valve plate on the valve stem, the control rod supporting and adjusting the valve stem such that the valve plate traverses the opening substantially along the stem axis And sealing the sealing surface of the valve plate against the valve seat to close the opening; wherein: the receiving portion and the connecting portion further comprise: an annular bearing portion that allows the valve plate to surround the valve stem relative to the valve stem The shaft axis is at least partially rotated such that at least the valve plate is pressed against the valve seat for the first time such that the alignment of the valve plate about the valve stem axis is adapted to the valve seat; and a restricting portion that holds the annular bearing portion The allowable rotation is limited to a range of angles such that the valve housing does not contact the valve plate as the valve plate traverses the opening. 2. The vacuum gate valve of claim 1, wherein the annular bearing portion further has a shaft formed at the connecting portion of the valve stem; and a hole in the receiving portion of the valve plate And the shaft is slidably pivoted in the hole by a clearance fit or a transition fit. 3. The vacuum gate valve of claim 1, wherein the limitation is Page 19 1316997_6. The patent application range further has: an outer polygonal portion formed on the connecting portion of the valve stem; and an inner polygonal portion in the receiving portion of the valve plate, the inner polygonal portion In cooperation with the outer polygonal portion, the inner polygonal portion has a large size with respect to the outer polygonal portion, and the rotation is limited to the angular range. 4. The vacuum gate valve of claim 3, wherein: the outer polygon is an outer quadrilateral having mutually parallel surfaces; and the inner polygon is an inner quadrilateral having inner faces parallel to each other. 5. The vacuum gate valve of claim 1, further comprising: a first screw hole in a side of the connecting portion of the valve stem substantially along the stem axis; a perforation a valve plate along the axis of the valve stem between the receiving portion and the opposite side of the receiving portion; and a bolt passing through the through hole and inserted into the first screw hole; so that the valve is placed along the stem axis The plate is axially removably secured to the valve stem. 6. The vacuum gate valve of claim 1, wherein the valve plate includes at least one handle recess in a reverse side of the sealing surface to apply force to the valve plate substantially along the valve stem axis, particularly for The valve plate is removed from the valve stem. 7. The vacuum gate valve of claim 5, wherein: the valve plate includes at least one second screw hole in a reverse side of the receiving portion to receive a multi-tool to substantially follow the valve stem The axis is manually applied to the valve plate, in particular to remove the valve plate from the stem axis, and Page 20 1316997_ VI. Scope of Application The bolt has a hex socket head whose wrench size (with respect to the width between the two corners) is smaller than the small diameter of the second screw hole of the valve plate. 8. A multi-tool for assembling and disassembling a valve plate and a valve stem of a vacuum gate valve according to claim 7 of the patent application, the multi-tool comprising a handle capable of applying at least one lift and a moment; a long straight shaft having a first end connected to the handle and a second end having: an outer hexagon portion formed at the distal end to apply a moment to the external thread of the bolt f adjacent to the outer six sides a portion for screwing the second screw hole of the valve plate to apply a force to the valve plate along the stem axis, in particular to remove the valve plate from the valve stem; in the outer hexagon The width between the two corners of the portion is smaller than the small diameter of the external thread. A valve plate according to any one of claims 1 to 7, comprising: a sealing surface having at least one sealing ring for closing a valve housing An opening in a wall; a receiving portion in the valve plate, a connecting portion of a valve stem is inserted into the receiving portion relative to the sealing surface to detachably mount the valve plate on the valve stem; Supporting and adjusting the valve stem with a control member such that the opening is closed as follows: traversing the valve plate substantially along the axis of the valve stem; Page 21 1316997____ 6. Patent application scope presses the sealing surface of the valve plate against the valve seat; characterized in that the receiving portion comprises: an annular bearing portion that allows the valve plate to be wound around the valve stem axis relative to the valve stem At least partially rotating such that alignment of the valve plate about the valve stem axis will accommodate the valve seat, at least for the first time the valve plate is pressed against the valve seat; and a restriction portion that allows the annular bearing portion to permit The rotation is limited to a range of angles such that the valve housing does not contact the valve plate as the valve plate traverses the opening. The valve plate of claim 9, wherein the annular bearing portion that allows rotation is formed as a hole in the receiving portion of the valve plate such that a valve that fits the hole is in the valve The shaft on the connecting portion of the rod is slidably coupled to the hole in a clearance fit or a transitional fit. The valve plate of claim 9 wherein the restricting portion is formed into a An inner polygonal portion of the receiving portion of the valve plate to receive an outer polygonal portion on the connecting portion of the valve stem, and the inner polygonal portion is engaged with the outer polygonal portion, the inner polygonal portion is opposite to the outer polygonal portion The portion has a large size that limits the rotation described above to the angular extent. The valve plate of claim 11, wherein the inner polygon is an inner quadrilateral to receive an outer quadrilateral, the inner quadrilateral having mutually parallel inner faces, the outer quadrilaterals having mutually parallel surfaces. 1 3, the valve plate of claim 9, further comprising a perforation in the valve plate along the axis of the valve stem, at the receiving portion and the 1316997_6. Between the opposite sides of the patent-receiving receiving portion to accommodate a bolt, the bolt is inserted substantially along the stem axis with a first screw hole in the side of the connecting portion of the valve stem, so that the valve is along the valve The rod axis axially releasably secures the valve plate to the valve stem. The valve plate of claim 9, comprising at least one handle recess in a reverse side of the sealing surface for applying force to the valve plate substantially along the valve stem axis, in particular for the valve plate Remove from the valve stem. The valve plate of claim 9, comprising at least one second screw hole in a reverse side of the receiving portion for receiving a multi-tool to apply force substantially along the axis of the valve stem The valve plate, in particular for removing the valve plate from the stem axis. Page 23