JP2017003099A - Annular cover for valve opening meter and gate valve with opening meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annular cover for a valve opening meter that is effective for a valve with an opening meter buried in the ground, has an enhanced sealing characteristic between the valve and the opening meter, prevents immersion of muddy water into it, while preventing looseness after its fixing by restricting a surplus clearance between the components of the opening meter, and easily carries out its fixing or removal, and to provide a gate valve including the valve opening meter.SOLUTION: A sectional surface of an annular cover main body 20 formed by elastic raw material is shaped into a substantially curved surface shape, an upper edge part of the cover main body 20 is provided with an engaging part 30 for pressing engaged with a rotating drive side for operating a valve shaft 32 of the valve main body 21, a lower edge part of the cover main body 20 is provided with an engaging pressing part 31 for pressing the upper part of the opening meter 22 fixed to a shaft installing part 34 of the valve main body 21 so as to cause a repelling force to act between the rotating drive side and the upper part of the opening meter 22 by a pressing force applied to the opening meter 22 through an elastic force of the cover main body 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an annular cover of a valve opening meter that displays the opening of a valve element connected to a valve rod to the outside, and a gate valve with an opening meter mounted with the annular cover.

  Conventionally, an opening meter for checking the opening degree of a valve body is usually provided in a valve such as an internally threaded gate valve, in which it is difficult to directly check the opening degree of the valve body from the amount of rotation of the valve rod. . With this opening meter, for example, the rotation of the valve stem of the gate valve decelerated by the reduction gear is displayed outside as the valve opening. Gate valves equipped with this kind of opening meter are often used in underground locations such as underground piping and manhole bottom positions. It becomes easy to adhere. If muddy water enters the inside of the opening meter, the accurate opening may not be displayed or it may lead to failure. It is required to prevent this.

  As such an opening meter, for example, an opening meter of Patent Document 1 is disclosed. In this opening meter, the reduction gear mechanism is housed in a sealed container sealed with a hermetic packing, and this structure tries to prevent muddy water from entering the sealed container.

  In the gate valve opening meter of Patent Document 2, a cap that rotates together with a valve stem is connected to a rotating body, and rotation of the valve rod is input to the rotating body via this cap, and has first and second rings. Decelerated by the deceleration mechanism. Pin holes are respectively provided in the cap and the rotating body, and connecting pins are inserted into these pin holes by fitting to connect the cap and the rotating body. A polygonal hole is formed on the bottom face side of the opening valve on the gate valve mounting side, and a projecting polygonal part formed on the upper part of the gate valve is fitted into the hole. Thus, it is attached to the gate valve in a non-rotating state.

  In the opening degree meter of the valve device of Patent Document 3, a cap is attached to the valve stem, and a fixing bolt is attached in the crossing direction of the cap. The speed reduction mechanism has an eccentric plate, an opening display plate, a rotating plate, and a main body, and a cap is mounted on the speed reduction mechanism so that a cap is placed on the eccentric plate, and a bolt is formed on the eccentric plate. It is latched by the cut part. Thus, the rotation of the valve stem is transmitted from the cap to the eccentric plate via the bolt, and the rotation of the valve rod is transmitted from the eccentric plate. A protrusion is provided on the bottom side of the opening meter, and the protrusion is engaged with a rib formed on the valve side so that the valve is mounted in a positioned state.

On the other hand, the gate valve may be provided with a valve opening meter having the structure shown in FIG. In the opening meter 1, a bush 4 is inserted from the bottom surface side of the scale body 3 having the scale portion 2, and a valve rod 5 is fitted and inserted into the bush 4. The bush 4 has an annular convex portion 4a on the outer periphery of the lower portion which is engaged with the step portion 3a of the scale body 3 and is positioned in the vertical direction. . The presser ring 6 is provided with a hexagon socket set screw 7, and the presser ring 6 is fixed to the valve stem 5 by screwing the set screw 7 into a locking groove 5 a formed on the outer periphery of the valve stem 5. The rod 5 and the bush 4 are rotated together in a fixed state. Between the presser ring 6 and the scale body 3, an annular hub member 8 is mounted on the bushing 4 by concave and convex fitting similarly to the presser ring 6, whereby the valve stem 5, bushing 4 and hub member 8 rotate. Be synchronized. An annular pointer body 9 is interposed between the hub member 8 and the scale body 3, and an external gear 11 that meshes with an internal gear 10 formed on the scale body 3 is mounted in the scale body 3. . The hub member 8, the pointer body 9, and the scale body 3 are incorporated coaxially by the bush 4 and are provided so as to be rotatable around the valve stem 5.
A concave polygonal portion 13 is formed on the bottom surface on the attachment side to the bulb 12 as in the case of Patent Document 2, and the convex polygonal portion 14 formed on the upper portion of the bulb 12 is fitted into the concave polygonal portion 13. Combined, the opening meter 1 is attached to the valve 12.

Such a valve opening meter is attached to the valve 12 including the gate valve shown in FIG. 11, for example. In the gate valve 12, a lid body 16 is attached to the upper part of the bonnet 12 a via a washer 15, and the valve stem 5 is held while being aligned by a bearing 16 a mounted inside the lid body 16. In this case, when the valve in FIG. 11A is opened, the valve body (not shown) is pulled upward, and the valve rod 5 moves downward by the height Y by the reaction force. On the other hand, when the valve in FIG. 11B is closed, the valve body is pushed down, and the reaction force causes the valve rod 5 to move upward by the height Y.
In the gate valve 12 of FIG. 10, an extra vertical gap between the convex polygon part 14 and the concave polygon part 13 due to such an operation, and an extra vertical gap between the parts of the opening meter 1. There is a mechanism to reduce this.
In order to reduce an extra vertical gap between the convex polygonal portion 14 and the concave polygonal portion 13, the cap member 17 and the opening degree which are integrally attached to the valve stem 5 so that the valve body can be opened and closed. A thrust washer 18 and a wave washer 19 are installed in the gap G with the total 1, and the opening gauge 1 is pressed downward by these to attempt to eliminate the generation of the gap.
In order to reduce the extra vertical gap between the parts of the opening meter 1, the hub member 8, the pointer body 9, and the scale body 3 are incorporated in the bush 4, and these parts are attached to the lower outer periphery of the bush 4. By sandwiching between the annular protrusion 4a and the presser ring 6 fixed to the valve stem 5 with a hexagon socket set screw 7, an attempt is made to eliminate the occurrence of a gap.
It is also conceivable to attach a bellows or a sponge that closes the gap between the opening meter 1 and the cap member 17 to prevent the intrusion of muddy water.

Japanese Patent No. 3741566 Japanese Patent No. 3470283 Japanese Patent No. 3742708

  In the above-described opening meter of Patent Document 1, the speed reduction gear mechanism has a structure accommodated in an airtight container. Therefore, the entire size is increased, and it may not be possible to embed in a narrow pipe or the bottom position of a manhole. Furthermore, in this opening meter, since the casing is hermetically sealed with packing, the structure becomes complicated and it takes time to assemble. A transparent plate for visually recognizing the pointer part in the sealed container is required, and the display part such as a scale is pasted on this transparent plate. .

  In the case where the opening degree meter 1 of Patent Documents 2 and 3 and FIG. 10 is provided in a valve embedded in the ground, for example, in the gate valve 12 of FIG. Is immersed in the muddy water, the muddy water is between the scale body 3 and the pointer body 9, between the pointer body 9 and the hub member 8, the gap G between the cap member 17 and the bush 4, and the top of the scale body 3 and the valve 12. There is a possibility of intrusion from between. If muddy water enters the interior from between these, an operation failure may occur in the opening meter 1, and accurate opening display may not be performed.

Thus, in the opening meters of Patent Documents 2 and 3, and FIG. 10, since the components of the opening meter 1 are combined up and down by engagement, an extra gap is easily generated in each component. When the opening meter 1 is mounted on the 11 gate valves 12, the clearance between the components tends to increase due to the vertical movement of the valve stem 5 when the valve is opened and closed. For this reason, the gap may cause rattling after the opening meter 1 is attached, and parts may fall off or be damaged. Further, the rattling may deteriorate the operability, and the opening degree display may not be performed correctly.
In addition, these opening gauges are integrated by fitting or engaging with the valve 12 on the bottom surface side, so that if a gap occurs between them, muddy water enters through the gap on the bottom surface side and operates. It may lead to a defect or may cause rattling with the valve 12.

As a countermeasure, in the opening meter of FIG. 10, the generation of the gap is suppressed by incorporating the thrust washer 18 and the wave washer 19 to prevent the intrusion of muddy water from the gap. Since the space between the two is exposed to the outside, the sealing performance is not sufficient. Further, for example, when a hole for passing the hexagon socket set screw 7 of the bush 4 is provided in the long hole in the axial direction, the hub member 8 and the pointer body 9, and the pointer body 9 and the scale body 3 are formed by the long hole. There is a gap between the two, and the possibility of muddy water entering through the gap increases.
Further, the thrust washer 18 and the wave washer 19 are incorporated in a resilient state, the opening meter 1 and the valve stem 5 are fixed with a hexagon socket set screw 7, or the presser ring 6 and the hub member 8 are bonded. There is also a problem that the work of closing the gap is required, and the mounting / removal work becomes complicated.
On the other hand, when a bellows or a sponge is attached between the opening meter 1 and the cap member 17, it becomes difficult to make the cap member 17 and the opening meter 1 elastic, and the extra parts of the opening meter 1 are excessive. It becomes difficult to suppress the gap, and the muddy water easily enters from the gap.

  The present invention has been developed to solve the above-described problems, and the object of the present invention is an annular cover particularly effective for a valve with an opening meter embedded in the ground. The valve is easy to install and remove, while preventing excess ratchet after installation by preventing excessive rattling and improving the sealing between the valve and the position gauge to prevent intrusion of muddy water. An object of the present invention is to provide an annular cover for an opening degree meter and a gate valve with an opening degree meter.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an annular cover body formed of an elastic material has a substantially curved cross section, and the upper edge of the cover body is used for operating the valve shaft of the valve body. An engaging portion for pressing that engages with the rotational drive side is provided, and a locking pressing portion that presses the upper part of the opening meter attached to the shaft mounting portion of the valve body is provided at the lower edge portion of the cover body. It is an annular cover of a valve opening meter that applies a repulsive force between the rotational drive side and the opening counting unit by a pressing force to the opening meter side by an elastic force.

  In the invention according to claim 2, the cover main body is made of a rubber material, has an annular flat shape, and the cross section has a curved surface shape from the center toward the outer side. It is the annular cover of the opening degree meter for valves which has the bulging form bulged from the thickness of.

  According to a third aspect of the present invention, the rotation drive side is an engagement portion formed in a lower portion of a valve shaft turning cap provided non-rotatingly on the valve shaft, and a pressing engagement portion is engaged with the engagement portion. An opening meter for the valve, in which an opening meter is provided around the valve shaft of the shaft mounting portion of the valve body, and the locking pressing portion is pressed and locked to the engaging portion provided on the upper portion of the opening meter. It is a cover.

  In the invention according to claim 4, the engaging portion formed at the lower portion of the valve shaft turning cap is an engaging step portion, and the engaging portion provided at the upper portion of the opening meter is an annular protrusion having an annular recess. This is an annular cover of a certain valve opening meter.

  The invention according to claim 5 is an internal screw type gate valve provided so as to be movable up and down with respect to a valve shaft in which a gate valve body built in the valve body is rotatably mounted on a packing box as a shaft mounting portion. An engagement step is formed in the lower part of the cap on the valve shaft operating rotational drive side provided non-rotatingly at the upper end of the valve shaft, and an opening meter is provided around the valve shaft of the packing box. An annular protrusion having an annular recess is formed on the upper portion of the meter, and the cross section of the annular cover body formed of an elastic material is formed in a substantially curved shape, and is provided on the upper edge of the cover body. The engaging part is pressed and engaged with the engaging step part, the locking pressing part provided at the lower edge of the cover body is engaged with the annular protrusion, and the upper surface of the opening meter is pressed to It is a gate valve with an opening meter in which a repulsive force is applied between the cap and the upper surface of the opening meter.

  In the invention according to claim 6, the opening meter includes a scale plate, a pointer plate, a hub, and an internal reduction gear mechanism, the scale plate is attached to the packing box, and the hub is used to rotate the cap. It is a gate valve with an opening meter configured to rotate with it.

  According to the first aspect of the present invention, the annular cover is particularly effective for an embedded valve with an opening meter, and the pressing engagement portion of the upper edge portion is engaged with the rotational drive side, and the lower edge portion is engaged. The stop-pressing part presses the opening-measuring part, and the repulsive force is exerted between the rotational drive side and the opening-measuring part by the pressing force on the opening-measuring instrument due to the elastic force of the cover body. To prevent the gap between the parts that make up the opening gauge from being lowered and prevent the position gauge from moving up and down due to rattling after installation and the opening and closing of the valve body. It is possible to close these gaps while covering the space between the meter and the valve to ensure sealing performance. Thereby, the infiltration of muddy water into the embedded valve with the opening meter is surely prevented, and the valve with the opening meter attached can be easily attached and detached.

  According to the second aspect of the present invention, the cover main body is made of a rubber material, has an annular flat shape, and has a curved cross section. Therefore, when a force is applied to the cover main body from above, it is elastic in the vertical direction. Force is accumulated, and this elastic force pushes the opening meter downward against the rotational drive side, so that the opening meter reduces the extra clearance in the vertical direction of the part and allows muddy water to enter from above. In addition, the movement of the opening meter can be stabilized by preventing the parts from shifting or dropping by suppressing the rattling of the parts. In addition, since the pressing engaging portion and the locking pressing portion have a bulging form that bulges from the thickness of the cover body, the elastic force accumulated in the curved surface portion can be used for the rotational drive side and the opening meter. The outer peripheries of the pressing engagement portion and the locking pressing portion are tightly sealed, and at the time of the tight sealing, the sealing area and strength are secured to improve the tight sealing performance, and the cover body is firmly engaged and held. Thus, high sealing performance can be maintained. Since the cover body can be easily attached to and detached from the valve after the opening gauge is installed, the replacement and maintenance of the parts is also easy.

  According to the invention which concerns on Claim 3 and 4, the engaging part which consists of an engagement step part in the lower part of the cap for valve shaft rotation, and the engagement part which consists of an annular protrusion which has an annular recessed part in the upper part of an opening degree meter, respectively By providing and engaging the engaging portion for pressing with the engaging step portion on the lower side, the engaging portion for pressing is fitted and stuck to the engaging step portion to prevent it from coming off. On the other hand, when the locking pressing portion is pressed and locked to the annular protrusion having the annular recess on the upper side, the locking pressing portion is brought into close contact with the annular recess and the cover main body is pressed in the vertical direction, thereby providing a sealing property. Hold. Accordingly, it is possible to improve the sealing performance of the engaging portion and prevent the entry of muddy water and dust while preventing the cover main body from shifting and dropping off. Furthermore, the rotational drive side and the opening meter are aligned by engaging the upper side of the annular cover body with the rotational drive side and the lower side with the opening degree counting unit.

  According to the invention of claim 5, it is particularly effective when an opening meter is provided in the embedded valve body, and the engaging portion for pressing on the upper edge portion of the cover body is engaged with the engaging step portion of the cap. , The engagement pressing part of the lower edge is engaged with the annular protrusion to press the opening counting part, and the pressing force to the opening meter by the elastic force of the cover body causes the gap between the cap and the opening counting surface. By exerting a repulsive force, the opening gauge is pressed from above to reduce the excess gap between the parts that make up this opening gauge, and to prevent rattling after installation. It is possible to close these gaps while covering the gap and ensure sealing performance. As a result, even when a valve body equipped with an opening meter is embedded, muddy water can be reliably prevented from entering the valve body and the opening can be accurately displayed. It is easy to install and remove.

  According to the invention of claim 6, the valve opening can be displayed outside while the overall height of the opening meter is kept low by the reduction gear mechanism. In this case, the cover body is mounted between the cap and the hub. By pressing the hub downward with the cover body, the gaps between the hub and the pointer plate, the pointer plate and the scale plate can be reduced to prevent the intrusion of muddy water or the like into the interior.

FIG. 3 is a half-sectional view showing an embodiment of an annular cover of the valve opening degree meter of the present invention. It is a partially expanded sectional view of FIG. It is a half-sectional view which shows the annular cover of the opening degree meter for valves. It is a partially notched front view which shows the other example of the cyclic | annular cover of the opening degree meter for valves of this invention. It is sectional drawing which shows embodiment of the gate valve with an opening meter. (A) is an enlarged front view which shows an opening meter. (B) is an enlarged bottom view showing an opening meter. It is a partially expanded sectional view which shows the other example of a sealing member. It is a partially omitted half-sectional view showing another embodiment of the gate valve with an opening meter. It is a partially abbreviated half-sectional view showing still another embodiment of a gate valve with an opening meter. It is a partially omitted half-sectional view showing a conventional valve with an opening meter. It is a semi-cylindrical sectional view which shows an example of the shaft mounting part of a gate valve.

Hereinafter, embodiments of an annular cover of a valve opening degree meter and a gate valve with an opening degree meter according to the present invention will be described in detail with reference to the drawings.
1 shows an embodiment of an annular cover of a valve opening meter according to the present invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, FIG. 3 is a half-sectional view of the annular cover, and FIG. A gate valve with a meter is shown.

  An annular cover (hereinafter referred to as a cover body 20) of the valve opening degree meter of the present invention is formed in an annular shape with an elastic material, and has a substantially curved cross section. More specifically, the cover main body 20 is made of a rubber material, has an annular flat shape, and has a curved surface section from the center toward the outside. The cover body 20 is attached between the cap 33 and the opening meter 22.

  The cover main body 20 is provided with a pressing engagement portion 30 and a locking pressing portion 31. The pressing engagement portion 30 is provided at the upper edge portion of the cover main body 20, and the pressing engagement portion 30 is provided on the rotary drive side for operating the valve shaft 32 of the valve main body 21, in this embodiment, the valve shaft 32. The cap 33 is provided so as to be engageable. On the other hand, the locking pressing portion 31 is provided at the lower edge portion of the cover body 20, and the locking pressing portion 31 can press the upper portion of the opening meter 22 attached to the shaft mounting portion 34 of the valve body 21. Provided.

  As shown in FIG. 2, the pressing engaging portion 30 and the locking pressing portion 31 each have a bulging form that bulges from the thickness T of the cover body 20. The thickness T of the curved portion of the cover body 20 is, for example, about 2 mm and is provided in a 12 mm round shape. The pressing engaging portion 30 is formed in a rectangular shape with a rounded cross section, for example, with dimensions of 8 mm in the longitudinal direction and 5 mm in the short direction, and an engaging portion 35 described later provided on the cap 33 with an inner diameter on the inner peripheral side surface. For example, it is formed to be smaller than the outer diameter of the engaging step portion by about 2 mm. The locking pressing portion 31 is formed, for example, in a circular shape in cross section, and is formed so that the inner diameter of the inner peripheral side surface is smaller by, for example, about 2 mm than the outer diameter of an annular recess 36 described later provided in the opening degree meter 22. The

As a mounting side on the upper side of the cover main body 20, a cap 33 on the rotational drive side is provided on the valve shaft 32 in a non-rotating manner in the valve main body 21. An engagement step portion that is a portion 35 is provided.
An opening gauge 22 is mounted around the valve shaft 32 of the shaft mounting portion 34 of the valve body 21 as a mounted side on the lower side of the cover body 20, and the opening gauge 22 has an annular protrusion having an annular recess 36 in the upper part. The part 37 is provided as an engaging part.

  In the above-described cover body 20, the locking pressing portion 31 is the annular protrusion of the opening meter 22 in a state where the pressing engagement portion 30 is pressed and engaged with the engagement step portion (engagement portion) 35 of the cap 33. By engaging with the (engaging portion) 37, the cover body 20 is mounted between the cap 33 and the upper surface 22 a of the opening meter 22 in a positioned state. Thus, the cover body 20 exerts a repulsive force between the cap 33 on the rotational drive side and the upper portion of the opening meter 22 by the pressing force from the cap 33 side to the opening meter 22 side by the elastic force. It is installed while.

  Here, in the present invention, the elastic force is a force stored in the cover main body 20 by pressing and shrinking the cover main body 20 in the vertical direction, and the repulsive force is the elastic force stored in the cover main body 20. The force acting on both the upper cap 33 and the lower opening meter 22 is a force, and the pressing force is the elastic force stored in the cover body 20 applied to the lower opening meter 22 or the upper cap 33. It is the force when working and pressing. The reaction force to be described later is the force that the gate valve 153 receives from the body 151 when a gate valve 153 (described later) is pressed against the body 151, or the opening meter 22 of the cover body 20. On the contrary, it is assumed that the cover body 20 receives a force from the opening meter 22 against the pressure applied to the opening.

The free height between the pressing engaging portion 30 and the locking pressing portion 31 of the cover main body 20 in FIG. 3, that is, the height of the cover main body 20 before being mounted between the cap 33 and the opening meter 22. 1 is a height dimension L for mounting the cover body 20 between the cap 33 and the opening meter 22 when the valve body 21 shown in FIG. 1 is fully closed, that is, when the cap 33 and the valve shaft 32 are raised. Rather than larger.
Accordingly, a downward force is accumulated in the cover main body 20 by the engagement of the pressing engagement portion 30 with the engagement step portion 35, and a hub 38 (to be described later) of the opening meter 22 is applied to the cap 33 by this force. On the other hand, the cover 33 is configured to rotate integrally with the cover body 20 as the cap 33 rotates while being always pressed downward.

  The cover body 20 of the present invention can be attached to the rotational drive shaft side for operating the valve shaft 32, that is, the valve shaft 32 side and the opening meter 22 so as to exert a repulsive force. It can also be provided in various shapes. For example, as the shape of the cover body other than the above, as shown in FIG. 4, it is provided in a curved cross-sectional shape with a height that can be sandwiched between the cap bottom surface 33a and the opening degree measuring surface 22a. The bellows is provided in a bellows shape so that it can be expanded or contracted. Alternatively, the pressing engagement portion and the locking pressing portion of the cover body are formed as a cylindrical portion, and the portion sandwiched between the cylindrical portions is formed into a curved cross-sectional shape. The cylindrical portion may be fitted from the outside to the cylindrical portion formed in the lower part of the cap and the opening degree counting portion, or may be mounted by fitting the concave and convex fitting portions. The cover main body is formed in a long cylindrical shape, and the upper portion of the cover main body is pressed by a cap rotation opening device (or handle) for pressing, and the opening meter is pressed to the lower portion of the cover main body. A locking press part, and a concave / convex engaging part for engaging the outer periphery of the cap between them, are installed between the opener and the opening meter with these three engaging parts engaged. Also good. In this case, particularly when the cap is rotated by the opener, the cover body is pressed. Furthermore, the cover body can be directly mounted between the valve shaft and the opening meter without bending a part of the curved surface shape of the cover body, forming a substantially tapered shape, or providing a cap on the rotational drive side. You may provide in a shape.

The pressing engagement portion 30 and the locking pressing portion 31 may have a shape other than the above-described rounded rectangular shape or circular shape.
Of these, the pressing engagement portion 30 does not stick to its shape and form as long as it has a holding force sufficient to resist the reaction force against the required pressing force on the opening gauge 22. For example, as shown in FIG. 4, the upper portion of the cover main body 39 may be provided in a curved cross-sectional shape so that the pressing engagement portion 30 can be pressed by the cap bottom surface 33a. Although not shown, the pressing engagement portion is formed of a material that can be attached to the outer periphery of the cap, for example, or the inner periphery of the pressing engagement portion is formed in an uneven shape that can be engaged with the outer periphery of the cap. It is also possible to form both the inner periphery of the engagement portion and the outer periphery of the cap into a concavo-convex shape that can be engaged, or a screw is screwed to the cap side and the pressing engagement portion is hooked on the screw. Other than these, for example, a pressing engagement portion that can be locked in a recess provided on the bottom surface of the cap, or an annular protrusion on the outer periphery of the cap, and a pressing engagement that can be locked to the annular protrusion from below. Alternatively, a pressing engagement portion may be provided in a shape in which a protrusion is provided on the bottom surface of the cap and is engaged with the protrusion.

  As long as the locking pressing part 31 presses the opening meter 22 with the cover main body 20 and withstands the intrusion of muddy water from the outside and holds the position of the cover main body 20, the pressing engaging part 30. It can be formed into various shapes in the same manner as in FIG. For example, as shown in FIG. 4, the locking pressing portion 31 is provided with a lower portion of the cover body 39 in a curved cross-sectional shape so as to be able to press the opening counting surface 22 a. Can be sandwiched by elastic force, or a depression is provided in the opening counting surface 22a to provide a locking pressing portion that can be engaged with the depression, or a depression is provided on the side of the opening meter. You may make it provide the latching press part latched in this.

  As described above, the cover main body 20, the pressing engaging portion 30, and the locking pressing portion 31 are provided in appropriate shapes and forms, so that the cover main body 20 can be connected to the rotational drive side of the various valve main bodies 21 and the opening meter. When the valve body 21 is installed in a pipe buried in the ground or in a place where rainwater or sewage is likely to scatter, the muddy water, rainwater or sewage can enter. Can be used while preventing.

  As shown in FIGS. 1 and 5, the opening degree meter 22 is provided around the valve shaft 32 of the shaft mounting portion 34 of the valve body 21, and the valve shaft rotating cap 33 provided on the valve shaft 32 so as not to rotate. The degree of opening and closing can be displayed by rotating the. The opening meter 22 includes a scale plate 40, a pointer plate 41, a hub 38, and an internal reduction gear mechanism 42.

  On the bottom surface side of the cap 33, a concave portion 44 is formed in which the parallel four-surface portion 43 formed on the upper portion of the valve shaft 32 can be fitted. With the parallel four-surface portion 43 and the concave portion 44 fitted, The cap 33 is fixed to the upper part of the valve shaft 32 by fixing these with a set screw 45. In the lower part of the cap 33, notched portions 46 each formed of a notched groove are formed at a plurality of positions at equal intervals. In this embodiment, the notched grooves 46 are provided at two positions at intervals of 180 °.

  A prism portion 47 is formed on the upper portion of the cap 33, and this prism portion 47 is provided so as to be capable of non-rotatingly engaging with an engaging surface 48a of a rotating jig 48 such as a manual handle. The cap 33 is rotated by a rotation jig 48, and the valve shaft 32 is rotatably provided by the rotation of the cap 33.

  As shown in FIG. 1, FIG. 6A, and FIG. 6B, a plurality of engagement portions 50 that are a pair of guides are radially provided on the lower surface of the scale plate 40. The guide 50 is engaged with the outer periphery of the shaft mounting portion 34 of the valve body 21 so as to sandwich the locking portions 51 which are a plurality of projecting ribs provided in the radial direction. 21 is attached to the shaft mounting portion 34. The projecting ribs 51 are formed in four positions on the shaft mounting portion 34 at equal intervals in a cross shape. By engaging the guide 50 with the projecting ribs 51, the valve shaft 32 and the dial 40 are aligned. In this state, the opening degree meter 22 is attached to a predetermined position of the valve body 21.

  6 (a) and 6 (b), an arc-shaped rib 52 may be formed between the pair of engaging portions 50 so as to protrude toward the engaging portion 50 side. In this case, when the locking part 51 is located at a place other than between the pair of engaging parts 50, the locking part 51 comes into contact with the rib 52, so that the opening meter 22 floats from the valve body 21. Therefore, it is possible to easily confirm that the mounting state is not correct.

  As shown in FIG. 2, an upward annular convex portion 53 is formed on the upper surface side of the scale plate 40, and an upper surface portion 40 a on which the pointer plate 41 is placed is provided annularly following the annular convex portion 53. The upper surface portion 40a has a slope inclined outward.

  An opening 55 having a diameter larger than that of the valve shaft 32 is provided at the center of the dial plate 40, and an engaging portion 56 is formed to project upward on the inner peripheral edge side of the opening 55. A protrusion 57 is provided on the inner periphery of the tip of the portion 56.

  A housing recess 58 is formed on the outer periphery of the opening 55, and external teeth 59 are integrally formed on the inner periphery of the housing recess 58. The external teeth 59 are, for example, a pitch circle diameter of 89 and 1/3 mm. The number of teeth is 60, and the pitch is 4.68 mm. The accommodation recess 58 accommodates an internal tooth 61 of a spur gear 60 described later in mesh with the external tooth 59. The internal teeth 61 and the external teeth 59 are formed with different numbers of teeth.

  A scale (not shown) is provided on the outer peripheral side of the upper surface of the scale board 40 at an appropriate position, shape, and interval by printing, sticking a sticker, and the like, and the rotational state of the pointer plate 41 can be externally displayed by this scale. It has been.

  The pointer plate 41 is provided in an annular shape and has a larger diameter than the upper surface portion 40 a of the scale plate 40. On the upper surface side of the pointer plate 41, a pointer portion such as an arrow for indicating an opening (not shown) is provided, and on the center side of the pointer plate 41, an upward annular convex portion 62 is formed like the scale plate 40. Is done. A portion of the pointer plate 41 on which the hub 38 is placed is provided with an upper surface portion 41a in an annular shape, and the upper surface portion 41a has a slope inclined outward. Four engaging concave portions 41b are formed at equal intervals on the lower surface side of the pointer plate 41, and an annular concave portion 67 is formed on the outer diameter side of the engaging concave portion 41b. Furthermore, an annular outer peripheral bottom surface 41 c is formed on the outermost diameter side of the lower surface, and this outer peripheral bottom surface 41 c is provided so as to be able to contact the upper surface portion 40 a of the dial plate 40.

  The hub 38 is formed in an annular shape and has a larger diameter than the upper surface portion 41 a of the pointer plate 41. An annular eccentric portion 38 a that is eccentric from the center by a predetermined eccentric amount protrudes from the bottom surface side of the hub 38, and the rotation of the valve shaft 32 is transmitted to the reduction gear mechanism 42 through the eccentric portion 38 a. . An annular concave portion 38c is formed on the outer diameter side of the eccentric portion 38a. An opening 70 having a larger diameter than the outer diameter of the valve shaft 32 is provided at the center of the hub 38, and an engagement projection 71 is formed to project toward the center on the inner peripheral surface of the opening 70. The annular protrusion 37 having the annular annular recess 36 described above is formed as an engaging portion on the upper portion of the hub 38, and an annular outer peripheral bottom surface 38b is formed on the outermost diameter side of the lower surface of the hub 38. 38 b is provided so as to be able to contact the upper surface portion 41 a of the pointer plate 41.

The engagement protrusions 71 are provided in appropriate numbers at rotationally symmetric positions on the inner peripheral surface of the opening 70, and each side surface of the notch groove 46 of the cap 33 fitted in the engagement protrusion 71 in a loosely fitted state. Are engaged.
On the inner diameter side of the eccentric portion 38 a of the hub 38, an engaging portion 73 protrudes downward, and a protruding portion 74 is provided on the outer periphery of the distal end of the engaging portion 73.

The reduction gear mechanism 42 is a planetary gear mechanism, and is provided inside the opening meter 22 and includes a mechanism that is operated by the hub 38, the spur gear 60, the dial 40, and the pointer plate 41.
The spur gear 60 is provided with the above-described internal teeth 61 at a lower position inside, and a protrusion 60a is formed on the upper surface side of the spur gear 60 so as to be fitted to the eccentric portion 38a of the hub 38. Through these, the upper side of the spur gear 60 is rotatably attached to the eccentric portion 38a. The internal teeth 61 are composed of, for example, pitch circle diameters: 94 and 2/3 mm, number of teeth: 61, pitch: 4.88 mm. Four engaging projections (not shown) are formed at equal intervals on the outer periphery of the protrusion 60a.

  The spur gear 60 is attached to the eccentric portion 38 a of the hub 38 and is in an eccentric state with respect to the scale plate 40, and the outer teeth 59 mesh with the inner teeth 61 when the hub 38 rotates, while rotating in the housing recess 58. Revolve. Although not shown, the pitch circle diameter of the outer teeth 59 and the pitch circle diameter of the inner teeth 61 are values close to each other so that the gap on the side opposite to the meshing side is about 2 mm.

  In the opening meter 22, the spur gear 60 is accommodated in the accommodating recess 58 of the scale plate 40, and the scale plate 40 is attached to the pointer plate 41. In this case, the annular convex portion 53 of the scale plate 40 is fitted into the annular concave portion 67 of the pointer plate 41 from below so that the pointer plate 41 and the scale plate 40 are positioned coaxially, and the pointer plate 41 The engaging convex part of the spur gear 60 is engaged with the engaging concave part 41b. As a result, when the spur gear 60 rotates by swinging rotation, the pointer plate 41 is rotated along with this rotation, and the pointer portion displays the opening of the scale plate 40 so that the valve body 21 is externally displayed. It is provided so that the opening degree of can be visually recognized.

  The pointer plate 41 is attached to the hub 38, and the scale plate 40 is integrally attached to the hub 38. At this time, since the annular convex portion 62 of the pointer plate 41 is fitted into the annular concave portion 38c of the hub 38 from below, the pointer plate 41 and the hub 38 are positioned coaxially, and the protruding portion 57 is provided. , 74 are snap-fit fitted to each other, the hub 38 and the dial 40 are engaged, and the opening degree meter 22 is integrated. With this structure, the entire opening meter is made compact.

  When the valve shaft 32 of the valve body 21 described above rotates, the rotation of the valve shaft 32 is decelerated via the planetary gear mechanism 42 and is displayed outside by the opening meter 22. In this case, when rotation is transmitted from the cap 33 to the valve shaft 32, this rotation is transmitted to the pointer plate 41 via the hub 38 and the spur gear 60, and the rotation of the pointer plate 41 is scaled on the dial 40. The rotation transmitted from the cap 33 to the valve shaft 32 can be confirmed from the outside as the valve opening degree.

  As shown in FIG. 5, the valve body 21 has a body 151 and a lid member 152, which are integrally fixed by a bolt (not shown). A valve body 153 is built in the valve body 21, and a valve shaft 32 is attached to the gate valve body 153 via a female screw top 154. A female screw 154a is formed on the inner periphery of the female screw top 154, and a male screw 32a formed on the valve shaft 32 is screwed onto the female screw 154a. The valve body 21 is so-called that the gate valve 153 moves up and down in the crossing direction with respect to the flow path 155 by opening and closing the flow path 155 by the female screw 154a and the external thread 32a when the valve shaft 32 is rotated. It consists of an internal screw type gate valve.

The shaft mounting portion 34 of the valve body 21 is a packing box for a gate valve, and a storage component 157 such as packing is stored in the packing box 34. As described above, the opening degree meter 22 is mounted around the valve shaft 32 of the gate valve main body 21, and the gate valve 153 is moved up and down by the rotation of the valve shaft rotation cap 33 provided non-rotatingly on the valve shaft 32. The valve opening during operation is displayed outside depending on the degree of opening and closing of the opening meter 22. Since the opening degree meter 22 is provided around the valve shaft 32 of the packing box 34, the packing box 34 is covered with the opening degree meter 22.
The valve main body 21 is not limited to the gate valve, and the cover main body 20 of the present invention can be attached to various valve main bodies 21 provided with the opening degree meter 22.

  When the opening degree meter 22 is attached to the valve body 21, the valve body 21 is positioned by the guide 50 and the protruding rib 51 on the lower side of the opening degree meter 22 as described above. As a result, the valve shaft 32 is not fitted into the opening 38 and the openings 70 and 55 of the scale plate 40, so that the openings 70 and 55 are larger than the outer diameter of the valve shaft. Also good. Therefore, the opening degree meter 22 is provided so as to be mounted on the valve shaft 32 having a different outer diameter, that is, the valve body 21 having a different nominal diameter.

  As shown in FIGS. 1 and 2, a seal having a V-shaped cross section is provided between the outer peripheral side of the shaft mounting portion 34 of the valve body 21 and the inner peripheral side of the lower surface of the scale plate 40 below the opening meter 22. A member 68 is attached. As a result, the valve body 21 and the opening meter 22 are tightly sealed while absorbing the variation in the outer peripheral diameter of the shaft mounting portion 34 and the variation in the coating thickness by the seal member 68, and the back of the opening meter 22. Prevents sticking to ensure operability and accurate opening indication, and closes the gap between the opening meter 22 and the valve body 21 to prevent intrusion of muddy water or the like from between them.

  Furthermore, the sealing member is not limited to the above-described cross-sectional shape, and for example, the sealing member 69 formed of a substantially T-shaped packing in the cross-sectional side direction shown in FIG. 7 may be used. The seal member 69 has a shape shown by a two-dot chain line before mounting, and a long inner ring seal portion 69a on the inner diameter side and a short outer ring seal portion 69b on the outer diameter side have different diameter seals. It is formed to project as a part.

When the seal member 69 is mounted between the shaft mounting portion 34 and the opening meter 22, as shown by the solid line in the figure, the seal is in contact with the outer periphery of the shaft mounting portion 34 with the inner diameter annular seal portion 69a bent upward. The outer diameter annular seal portion 69b abuts and seals on the inner circumference of the scale plate 40 while compressively deforming in the direction of diameter reduction. By using this seal member 69a, water can be reliably stopped in a state in which the inner and outer peripheral side adhesion is improved, and the inner diameter annular seal portion 69a is thin and easily deformed in the bending direction. The mountability between the mounting portion 34 and the opening meter 22 is good, and the overall assemblability is also improved. In this case, variations in the outer diameter of the shaft mounting portion 34 and variations in the coating thickness can be absorbed by the seal portion 69a.
Although not shown, the inner diameter annular seal portion may have a triangular cross section. In this case, the inner ring seal portion is further easily deformed to improve the assemblability. An O-ring may be used as the seal member. In this case, an off-the-shelf O-ring can be used.

  As described above, the cover body 20 is attached to the gate valve with an opening meter in which the valve body and the opening meter are integrated. In this case, the pressing engagement portion 30 and the locking pressing portion 31 of the cover main body 20 are engaged with the engagement protrusion 35 of the cap 33 and the annular protrusion 37 having the annular recess 36 of the hub 38 in close contact with each other. Thus, the gap G between the cap 33 and the hub 38 is covered. Thereby, even when the valve main body 21 is connected to a pipe or the like buried in the ground, the rotation operation of the cap 33 is performed while preventing the entry of muddy water or dust into the valve main body 21 or the cover main body 20. Thus, the gate valve body 153 can be operated while confirming the display of the opening meter 22.

Further, since the cover body 20 can hold the upper part of the opening meter 22 and the cap 33 (valve shaft 32) and the sealing member 68 can hold the lower part of the opening meter 22 and the shaft mounting part 34 in concentric positions, respectively. The opening gauge 22 can be mounted in a state where it is accurately positioned on the valve body 21 by the aligning action. As a result, there is no possibility that a force inclined from the cap 33 is transmitted to the engagement protrusion 71 of the hub 38, and the opening degree display by the reduction gear mechanism 42 becomes smooth.
As described above, the cover body 20 prevents the opening gauge 22 from being lifted, so that the seal member 68 can be prevented from being displaced or dropped out, and its function can be maintained.

Next, the operation of the above embodiment of the annular cover of the valve opening degree meter and the gate valve with the opening degree meter of the present invention will be described.
The valve main body 21 shown in FIGS. 1 and 5 has an opening degree meter 22 around the valve shaft 32 of the packing box 34, and the degree of opening and closing of the opening degree meter 22 is controlled by the rotation of the cap 33 for turning the valve shaft 32. Even when the valve body 21 is buried in underground piping or a manhole bottom position, the opening degree can be confirmed from the outside by the opening degree meter 22.

  As shown in FIG. 2, the cover main body 20 of the present invention is maintained between the opening degree meter 22 provided in the valve main body 21 and the cap 33 for rotating the valve shaft 32, thereby maintaining the overall compactness. The space between the valve body 21 and the opening meter 22 can be covered. In this case, the cross section of the annular cover body 20 is formed in a substantially curved shape, and the pressing engagement portion 30 provided on the upper edge portion of the cover body 20 is engaged with the engagement step portion 35 of the cap 33, Since the locking pressing portion 31 provided at the lower edge portion of the main body 20 is pressed and locked to the annular protrusion 37 having the annular recess 36 of the opening meter 22, the gap G between the cap 33 and the cover main body 20 is covered. Can be installed while. As a result, it is possible to prevent the gap G from being exposed to the outside, and to prevent muddy water from entering the gap G.

  At that time, the cover main body 20 of FIG. 3 is made of rubber, has an annular flat shape, and has a curved cross section so that a large elastic force can be accumulated particularly in the vertical direction. When the main body 20 is pushed from above with the cap 33, the rotational drive side cap 33 and the upper portion of the opening meter 22 are pressed by the pressing force from the cap 33 side to the opening meter 22 side by the elastic force of the cover body 20. A repulsive force can be exerted between them to improve the tight sealability on the pressing engagement portion 30 side and the locking pressing portion 31 side. In addition to this, the cover body 20 presses the hub 38, the pointer plate 41, and the scale plate 40 from the upper side, thereby reducing the excess gap in the vertical direction of these components. Thus, the gap G is closed by the cover body 20, the upper and lower attachment portions of the cover body 20 are sealed, the gap in the vertical direction of the parts of the opening meter 22 is reduced, and the sealing performance is improved. Infiltration of muddy water into the total 22 and the valve body 21 can be reliably prevented.

In this case, the pressing engagement portion 30 and the locking pressing portion 31 have a swelled form with respect to the thickness T of the cover body 20.
Of these, the pressing engagement portion 30 is formed in a rounded cross-sectional shape, and the inner diameter of the inner peripheral side surface thereof is 2 mm smaller than the outer diameter of the engagement step portion 35, so that the inner peripheral side surface has an inner peripheral surface. The elastic force in the direction works and comes into close contact with the cylindrical side surface portion of the cap 33. In this state, the upper surface side of the pressing engagement portion 30 is engaged with the engagement step portion 35 by the elastic force of the cover body 20 and the pressing force from the cap 33. It is possible to exhibit high sealing performance by pressing and holding while closely contacting.

  On the other hand, the engagement pressing portion 31 is formed in a circular shape in cross section, and the inner periphery of the inner peripheral side surface is provided 2 mm smaller than the outer diameter of the annular recess 36, so that the inner peripheral side surface is elastic in the inner peripheral direction. The force is applied to move so as to fit into the annular recess 36 on the inner peripheral side of the annular protrusion 37, and in this state, high sealing performance can be exhibited by the elastic force of the cover body 20 and the pressing force from the cap 33.

  As a result, even after the valve body 21 is buried, the mounted state of the cover body 20 can be maintained, and high sealing performance can be maintained over a long period of time to prevent entry of muddy water. In addition, since the bulge-like pressing engagement portion 30 and the locking pressing portion 31 can secure the strength while increasing the sealing area and improving the sealing performance, inadvertent misalignment and dropping can be prevented. On the other hand, since the cover main body 20 can be easily attached to and detached from the valve main body 21 while manually disengaging the pressing engaging portion 30 and the locking pressing portion 31, the replacement and maintenance of parts are also simplified.

  Due to the elastic force of the cover main body 20 and the pressing force from above, the opening meter 22 and the shaft mounting portion 34 are caused by the vertical movement of the valve shaft 32 caused by the reaction force with the valve shaft 32 when the gate valve body 153 is opened and closed. Prevents the occurrence of extra vertical gaps and extra vertical gaps between parts of the position gauge. Thereby, for example, when the valve shaft 32 rotates from the fully open state to the fully closed state of the valve body 21, the cap 33 rises by about 3 mm. In this case as well, the cover body 20 is interposed between the cap 33 and the hub 38. The opening gauge 22 is not lifted from the shaft mounting portion 34, and the clearance between the hub 38, the pointer plate 41, and the dial 40 is reduced. Can hold.

  The sealing member 68 provided between the shaft mounting part 34 and the scale plate 40 ensures the sealing between the opening gauge 22 and the shaft mounting part 34 when the opening gauge 22 is pressed from above. Intrusion of muddy water from between the two can also be prevented, and when the gate valve 153 is opened and closed, the mounting state of the opening meter 22 on the shaft 34 is maintained, and the opening meter 22 is detached from the valve body 21. Can be prevented. The sealing member 68 can also exert a centering action, prevent the position gauge 22 from being displaced relative to the valve body 21, and maintain an accurate position display by the smooth operation of the position gauge 22.

  The opening 55 is formed to have an inner diameter larger than that of the shaft mounting portion 34, and the sealing member 68 is mounted and positioned between the opening 55 and the shaft mounting portion 34, so that valve shafts having different outer diameters are provided. 32, that is, one opening meter 22 can be shared for the valve bodies 21 having different nominal diameters.

In FIG. 8, other embodiment of the gate valve with an opening meter is shown. In the following embodiments, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.
In the valve main body 80 of this embodiment, the set screw 45 that fixes the valve shaft 32 and the cap 81 is disposed at a position where it can be stored inside the cover main body 20, and the set screw 45 is covered with the cover main body 20. It is. In this case, the cover body 20 prevents the muddy water from splashing on the set screw 45, and the generation of rust can be suppressed without subjecting the set screw 45 to rust prevention.

  In addition, the height of the cap 81 is made low, and the distance from the bottom surface of the cap 81 to the valve body 80 is made smaller than in the above embodiment. Specifically, the distance from the bottom surface of the cap 81 to the valve body 80 is provided so that it can be reduced to nearly 0 mm when the valve is fully opened. Thereby, the whole height of the valve main body 80 after the opening degree meter 22 is mounted can be provided low. In the valve main body 80, an O-ring 82 is mounted as a seal member between the shaft mounting portion 34 and the scale plate 40.

FIG. 9 shows still another embodiment of a gate valve with an opening meter.
In the valve main body 90 of this embodiment, a cap 91 having a manual operation handle 92 is attached to the valve shaft 32, and the valve shaft 32 is provided so as to be manually operable by the handle 92. A cover main body 20 is mounted on.

  In this case, the pressure engaging portion 30 of the cover main body 20 is connected to the valve main body similarly to the above-described embodiment while directly operating the valve shaft 32 by the handle 92 integral with the cap 91 without providing a separate handle. The annular recess 36 of the opening meter 22 is engaged with the engagement step portion 35 of the cap 91 which is the rotational drive side of the valve shaft operation 90, and the locking pressing portion 31 of the cover body 20 is attached to the valve body 90. The cover body 20 can be mounted while exerting an elastic force between the cap 91 on the rotational drive side and the upper portion of the opening meter 22 by being pressed and locked to the annular protrusion 37 having the same.

DESCRIPTION OF SYMBOLS 20 Cover main body 21 Valve main body 22 Opening meter 22a Opening measurement surface 30 Engaging part 31 for pressing 31 Locking pressing part 32 Valve shaft 33 Cap 34 Packing box (shaft mounting part)
35 Engagement step (engagement part)
36 Annular recess (engagement part)
37 Annular protrusion (engagement part)
38 Hub 40 Scale plate 41 Pointer plate 42 Reduction gear mechanism 153 Gate valve body T Thickness

Claims (6)

  A cross section of an annular cover body formed of an elastic material is formed in a substantially curved shape, and a pressing engagement portion is provided on the upper edge portion of the cover body to be engaged with the rotation drive side for valve shaft operation of the valve body. The lower end of the cover main body is provided with a locking pressing portion that presses the upper part of the opening meter attached to the shaft mounting portion of the valve main body, and is pushed toward the opening meter side by the elastic force of the cover main body. An annular cover for a valve opening meter, wherein a repulsive force is exerted between the rotational drive side and the opening counting portion by pressure.   The cover body is made of a rubber material, has an annular flat shape, and has a curved surface from the center to the outside. The pressing engagement portion and the locking pressing portion are larger than the thickness of the cover body. The annular cover of the valve opening degree meter according to claim 1, which has a protruding bulge shape.   The rotation drive side is an engagement portion formed in a lower portion of a valve shaft rotation cap provided non-rotatingly on the valve shaft, and the engagement portion for pressing is engaged with the engagement portion, and the valve 3. A valve according to claim 1, wherein an opening meter is provided around the valve shaft of the shaft mounting portion of the main body, and the locking pressing portion is pressed and locked to an engaging portion provided at an upper portion of the opening meter. An annular cover for the opening meter.   The engagement part formed in the lower part of the cap for said valve shaft rotation is an engagement step part, and the engagement part provided in the upper part of the said opening meter is an annular protrusion which has an annular recessed part. Annular cover for the valve opening meter.   An internal thread type gate valve provided so as to be movable up and down with respect to a valve shaft rotatably mounted on a packing box that is a shaft mounting portion of a gate valve body built in the valve body. An engaging step portion is formed at the lower part of the cap that is non-rotating at the upper end of the valve shaft operation rotational drive side, and an opening meter is provided around the valve shaft of the packing box. And forming an annular protrusion having an annular recess, forming an annular cover body made of an elastic material in a substantially curved cross section, and providing a pressing engagement portion provided on an upper edge of the cover body. By engaging with the stepped portion, engaging the locking pressing portion provided at the lower edge of the cover body with the annular protrusion, pressing the upper surface of the opening meter, and by the elastic force of the cover body Opening characterized in that a repulsive force is applied between the cap and the upper surface of the opening meter. Gate valve attached.   The opening meter includes a scale plate, a pointer plate, a hub, and an internal reduction gear mechanism. The scale plate is attached to the packing box, and the hub rotates as the cap rotates. The gate valve with an opening degree meter according to claim 5 configured to do so.

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