Rotary valve opening stopper structure, rotary valve opening / closing lock structure, and rotary valve

Abstract

To provide an opening stopper structure of a rotary valve, open / close locking structure, and a rotary valve capable of certainly regulating an opening within a range of a predetermined angle without influencing on the ground at all, even with a simple structure.SOLUTION: An opening stopper structure of a rotary valve is equipped with a stopper member 40 that rotates so as to coaxially interlock with a stem 10 rotating a valve body 8 in a body 2, a movable member 50 capable of coaxially rotating with the stem 10, and a positioning portion 31 that is provided on the body 2, and regulates a start point and a finish point of a rotation range of the movable member 50 at a positional relationship less than a predetermined angle. The stopper member 40 regulates the rotation range relative to the movable member 50. By combining the rotation range to the positioning portion 31 of the movable member 50 and the rotation range relative to the movable member 50 of the stopper member 40, an operation range of the rotary valve is rotation-regulated at a predetermined angle.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an opening stopper structure for a rotary valve such as a ball valve or a butterfly valve, an opening / closing lock structure for a rotary valve, and a rotary valve. [Background technology]

[0002] Generally, rotary valves such as ball valves are widely provided with a stopper mechanism for restricting the rotation of the handle at a fully closed or fully open position. In order to prevent fluid leakage, there are regulations in international standards etc. stating that the gland bolt and gland, which are parts related to the sealing structure of the gland packing, must not be involved in the opening stopper.

[0003] Therefore, in order to comply with this standard, Patent Document 1 proposes an opening stopper structure in which a stopper plate is fixed to an axle mounting portion provided on the body, and a lock plate with a stem fixed in a co-rotating state is rotated together with the stem in an opening formed in this plate with an opening in a 90-degree range, thereby restricting rotation within a 90-degree range. In any case, it is necessary to provide a stopper structure in a structural portion unrelated to the ground or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-205485 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although Patent Document 1 has a stopper structure that complies with the above standards, it is necessary to further provide a stopper plate on the upper surface of the stem mounting portion to allow rotation within a 90-degree range, and a stopper piece to engage with this stopper plate.

[0006] On the other hand, even if a structural part unrelated to the ground is made into a stopper structure, it is not necessarily in a relative positional relationship that can reliably stop it at a 90-degree rotation to regulate the opening degree, and therefore a stopper mechanism with a 90-degree rotation operation cannot be adopted as is.

[0007] Therefore, there is a need to develop an opening stopper structure for a rotary valve that can be used as an opening restriction structure for a rotary valve even if the stopper part other than the gland, etc., cannot be stopped within a 90-degree range.Furthermore, there is a need to develop a rotary valve that, along with the opening stopper structure, can lock the valve open and closed with a simple structure.

[0008] The object of the present invention is to provide an opening stopper structure and an opening / closing lock structure for a rotary valve, which are simple in structure yet enable the opening to be reliably restricted within a predetermined angle range without affecting the gland or the like, and a rotary valve. [Means for solving the problem]

[0009] In order to achieve the above object, the invention of claim 1 comprises a stopper member that rotates coaxially with a stem that rotates the valve body inside the body, a movable member that can rotate coaxially with the stem, and a positioning portion that is provided on the body and restricts the start and end points of the rotation range of the movable member to a positional relationship of less than a predetermined angle, wherein the rotation range of the stopper member relative to the movable member is restricted, and the rotation range of the movable member relative to the positioning portion and the rotation range of the stopper member relative to the movable member are combined to provide an opening stopper structure for a rotary valve that restricts the operating range of the rotary valve to a predetermined angle.

[0010] The invention of claim 2 comprises a stopper member axially attached to the stem in a connected state, a movable member axially attached to the stem in an unconnected state, a positioning portion provided on the body that restricts the start and end points of the rotation range of the movable member to a range of less than 90 degrees, and a locking opening formed to lock a part of the movable member to the stopper member, wherein the stopper member restricts the relative rotation range of the movable member by allowing a part of the movable member to move only within the locking opening, and the rotation range of the movable member relative to the positioning portion and the rotation range of the stopper member relative to the movable member restrict the rotation range of the handle to 90 degrees.

[0011] The invention according to claim 3 is an opening stopper structure for a rotary valve, in which the stopper member is plate-shaped and the movable member is plate-shaped.

[0012] The invention according to claim 4 is an opening stopper structure for a rotary valve, in which the positioning portion is constituted by a positioning stopper portion screwed into a female thread portion for mounting an actuator provided in a mounting portion of the body.

[0013] The invention of claim 5 is an opening / closing lock structure for a rotary valve in which, in the opening stopper structure for the above-mentioned rotary valve, when the movable member abuts against the positioning portion and the stopper member is restricted to a fully closed or fully open position relative to the movable member, causing the handle to be in a fully closed or fully open state, the positioning portion is fixed with a locking member so as to be sandwiched between the positioning portion and the movable member abutting against the positioning portion, thereby restricting the handle from rotating from that position.

[0014] The invention according to claim 6 is a rotary valve using the above-mentioned rotary valve opening stopper structure.

[0015] The invention according to claim 7 is a rotary valve using the above-mentioned rotary valve open / close lock structure. [Effects of the Invention]

[0016] According to the invention of claim 1, even if the positioning part alone can only restrict the rotation range to less than a predetermined angle, by combining the stopper member and the movable member, the rotation range of the rotary valve can be expanded more than when only one is used, making it possible to restrict rotation at a predetermined angle, so that the opening stopper of the rotary valve can be restricted to a predetermined angle range with a simple configuration.

[0017] According to the invention of claim 2, it can be suitably applied to a rotary valve that restricts the opening angle to, for example, 90 degrees, and the structure that engages with the engagement opening makes it easy to restrict the relative rotation angle between the stopper member and the movable member. In other words, even if a positioning part with a start point and end point of less than 90 degrees is used in the opening stopper structure of a rotary valve, when the handle is operated, the stopper member rotates together with the stem, and when the movable member rotates to a predetermined range, the movable member abuts the positioning part and the rotation range of the movable member is restricted by the positioning part, and accordingly the rotation range of the stopper member is restricted.Therefore, the rotational movement range of the handle can be restricted to 90 degrees by the rotation range of the movable member relative to the positioning part and the rotation range of the stopper member relative to the movable member, so even if the positioning part provided on the body is in a range of less than 90 degrees, the opening can be precisely restricted with a simple structure without abutting against a ground or the like. Furthermore, since the positioning portion can be provided on the body, it is possible to provide the stopper portion in a structural part that is unrelated to the ground, etc., and it is possible to provide a stopper structure that complies with international standards that stipulate that ground-related parts cannot be used as stoppers.

[0018] According to the invention of claim 3, the stopper member and the movable member are each plate-shaped, so they can be easily combined and arranged one above the other, making it even easier to install them in a shaft mounting part where space is limited.

[0019] According to the invention of claim 4, the positioning portion uses a female thread portion for mounting an actuator provided on the axle mounting portion of the body as a positioning stopper, which allows the start and end points to be determined with precision, thereby appropriately and accurately restricting the rotation of the handle to 90 degrees. Furthermore, female threads for mounting actuators are often provided in manually operated valves to make the structure common to automatically operated valves, and in such cases they are provided at precise intervals according to standards. Therefore, even if the size of the valve is different, it is possible to use the existing female threads as they are without machining a new one, and positioning can be ensured.

[0020] According to the invention of claim 5, when the movable member abuts against the positioning portion to become fully closed or fully open, the positioning portion is sandwiched between the movable member abutting against the positioning portion and the locking member. By locking the locking member, the locking member abuts against the positioning portion and the stopper member cannot rotate in the direction returning from the fully closed or fully open position. This fixes the movable member and the stopper member and restricts the rotational movement of the handle. Therefore, with a simple structure that sandwiches and locks the positioning portion when in the fully closed or fully open state, it is possible to prevent malfunction in a stable fully closed or fully open state.

[0021] According to the invention of claim 6, it is possible to provide a rotary valve having an opening stopper structure that can restrict the opening to a predetermined degree while having a simple structure and without affecting the gland at all.

[0022] According to the invention of claim 7, it is possible to provide a rotary valve having a simple structure, an opening stopper structure, and an opening / closing lock structure without affecting the gland at all. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is an exploded perspective view showing the opening stopper structure of a ball valve according to the present invention; FIG. [Figure 2]FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a partially enlarged cross-sectional view of the opening stopper structure of the same. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 8 is a perspective view showing the opening stopper structure of FIG. 7. [Figure 9] FIG. 1(a) is a plan view of the stopper plate, and FIG. 1(b) is a plan view of the movable plate. DETAILED DESCRIPTION OF THE INVENTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the rotary valve opening stopper structure, the rotary valve opening / closing lock structure, and the rotary valve of the present invention will be described in detail with reference to the drawings.

[0025] The rotary valve to which the opening stopper structure and opening / closing lock structure of the present invention can be applied is not particularly limited, and can be attached to rotary valves such as ball valves and butterfly valves, and in this example, an embodiment applied to a ball valve will be described.

[0026] FIG. 1 is a perspective view showing the opening stopper structure of a ball valve according to the present invention, FIG. 2 is a perspective view showing the same in an open state, FIG. 3 is a perspective view showing the same in an intermediate opening state, FIG. 4 is a perspective view showing the same in a closed state, and FIG. 5 is a partially enlarged cross-sectional view of the opening stopper structure.

[0027] As shown in Figure 5, the rotary valve (valve body 1) is provided with an inlet 1a and an outlet 1b for fluid, and a mounting portion 3 extends from the top of the body 2, with an insertion hole 3a provided inside the mounting portion 3. A stem 10, which is an actuation transmission member, is inserted into this insertion hole 3a. The inlet and outlet are covered with lids when not in use.

[0028] As shown in the figure, a flange-shaped mounting portion 4 is provided on the upper end surface of the mounting portion 3, and a female thread portion 6 that allows an actuator to be mounted on this mounting portion 4 is formed, and a positioning portion 31 is screwed into this female thread portion 6. In addition, a stopper member (stopper plate) 40 and a movable member (movable plate) 50 are attached to the top of the stem 10 to form an opening stopper structure that will be described later. The valve body 1 can be manually operated by attaching a handle 28 to the stem 10, and the internal flow path 8a of the ball valve element 8 is opened or closed by rotating the stem 10 by 90 degrees.

[0029] A cap 5 is fixed to the body 2 with a fixing bolt, and they are provided as a single unit. A ball valve element 8 is provided within the body 2 and sandwiched between two seat rings 7, and a stem 10 is attached to the ball valve element 8, allowing the ball valve element 8 to rotate freely via the stem 10. A gland packing 21, which is a sealing member, is installed in the insertion hole 3a.

[0030] The upper end of the stem 10 is formed with a threaded portion 11 for threading a handle fixing bolt 26 with a washer 27 interposed therebetween, and also with a parallel two-face portion 12 which is engaged with the parallel two-face portion of the handle 28, so that the handle 28 is attached to the stem 10 so as to be rotatable integrally with the stem 10. Furthermore, a groove for fitting a C-shaped retaining ring 29 is provided at the upper end of the stem 10, and the C-shaped retaining ring 29 can prevent the stopper plate 40 and the movable plate 50 from coming off.

[0031] The gland 20 is fixed with a fixing member (gland bolt) 22. When fixing the gland 20, the gland bolt 22 is inserted through a bolt insertion hole formed in the gland 20, and a part of the tip side of the gland bolt 22 is screwed into a female thread formed on the body 2 side, so that the gland 20 presses the gland packing 21 toward the body 2, and the gland packing 21 is filled into a packing chamber provided between the body 2 and the stem 10 to seal around the stem.

[0032] The opening stopper structure of this example is composed of a stopper member 40, a movable member 50, and a positioning portion 31. Therefore, it can be installed in a limited space such as the mounting portion of the valve body, and the opening stopper structure can be constructed with a small number of parts.

[0033] The positioning portion 31 is made up of a positioning stopper portion (screw member) 32 and a spacer 33, and is screwed into female thread portions 6 for mounting the actuator formed in the mounting portion 3 of the body 2, and in this example, the positioning portion 31 is screwed into two of the four female thread portions 6 formed in the mounting portion 4 of the body 2. The positioning portion may also be made up of a pin member. The positioning portion 31 is provided to regulate the start and end points of the rotation range of the movable member 50, and is provided so that the start and end points are positioned at an angle less than a predetermined angle (for example, less than 90 degrees). Here, the predetermined angle may be 90 degrees or 180 degrees, and can be selected appropriately depending on the opening range appropriate for regulating the operating range of the rotary valve. Note that the positioning unit 31 does not need to be configured by two members that define the start and end points, but may be anything that can define the start and end points of the rotation range of the movable member 50 in relation to the movable member 50. For example, the positioning unit may be a single member (e.g., a single pin), and a slit-shaped opening or the like may be provided on the movable member 50 side, and the rotation range of the movable member 50 may be restricted by engagement with the pin that is the positioning unit 31.

[0034] The positioning portion 31 that serves as a stopper for the movable member 50 can be any part unrelated to the ground 20, but since the screw hole 6 for mounting the actuator formed in the axle mounting portion 3 of the body 2 is usually provided in a predetermined positional relationship, by utilizing this screw hole it is easy to determine the relative positional relationship of the positioning portion 31, and the start and end points of the rotation range of the movable member 50 can be appropriately regulated. In addition to this example, the body or other parts can be used as the positioning part 31. The gland 20 or gland bolt 22 can be used as the positioning part 31, but standards such as API608, API6D, and ISO17292 stipulate that gland-related parts such as glands, gland flanges, and gland bolts that affect sealing performance should not be used for positioning.

[0035] Here, when the screw holes for mounting the actuator are used for positioning, and a specific member is abutted between the positioning parts to form a stopper mechanism that regulates the opening degree, the angle between the positioning part that serves as the starting point and the positioning part that serves as the end point is less than 90 degrees, so the opening and closing movement of the handle cannot be precisely regulated to 90 degrees. Therefore, in this example, by combining a stopper member (stopper plate) 40 and a movable member (movable plate) 50, the operating range of the rotary valve can be appropriately adjusted to 90 degrees.

[0036] As shown in FIG. 9( a ), the stopper member 40 is made of a thin metal plate and has a base 41 and a protruding portion 42 extending from the base 41 . The stopper member 40 is plate-shaped, and a base 41 is formed with a fitting portion 43 for axially attaching to the stem 10 in a coupled state, and this fitting portion 43 is provided with a two-face locking portion 44 that can fit into the two parallel faces 12 of the stem 10. The engagement between the two-face locking portion 44 and the two parallel faces 12 of the stem 10 enables the stem 10 and the stopper plate 40 to rotate together, and the stopper plate 40 rotates coaxially with the stem 10.

[0037] The protrusion 42 has a locking opening 45 formed therein to which the movable plate 50 is locked, and the locking portion 54 of the movable plate 50 described later is provided so as to be able to lock onto it, thereby guiding the rotation range and restricting the rotation range of the stopper member 40. Specifically, the rotation range of the stopper plate 40 relative to the movable plate 50 is restricted by the locking portions 54 of the movable plate 50 abutting against the abutment portions 46 (first abutment portion 46a, second abutment portion 46b) of the locking opening 45. Furthermore, the rotation of the stopper plate 40 is not restricted by the positioning member 31, but rather its rotation range is restricted by its relationship with the movable plate 50. Therefore, the restriction on the rotation range of the stopper plate 40 via the movable plate 50 restricts the rotation range of the stem 10, which rotates in conjunction with the stopper plate 40, and as a result, the rotation range of the handle 28 that controls the rotation of the stem 10 is restricted. The locking opening 45 of the stopper plate 40 can be easily formed by press working or the like, and therefore can be manufactured at low cost despite its simple structure.

[0038] A hole (key lock hole) 47 for inserting a locking member (such as a padlock) 61 is formed near the locking opening 45. As shown in Figures 2 and 6, for example, when the valve body 1 is in the fully open state, the hole 47 is locked with the locking member 61, thereby preventing the handle from malfunctioning. In this example, two holes 47 are provided on the outer periphery of the protruding portion 42 so that the fully closed or fully open state can be fixed. Note that the holes 47 may be provided on the inner periphery, may be integrated with the locking opening 45, or may have multiple holes.

[0039] 9(b), the movable member 50 is made of, for example, a metal material, is plate-shaped, and has a circular base 51 and a protrusion 52 protruding from the base 51. The base 51 is formed with a mounting hole 53 for axially attaching the movable plate 50 to the stem 10 in an uncoupled state to enable coaxial rotation, and the movable plate 50 is attached to the stem 10 so as to be rotatable about the axis of the stem 10 without rotating with the rotation of the stem 10. Note that although the movable plate 50 can rotate coaxially with the stopper member 40 described above, it does not need to rotate in conjunction with the stem 10, and therefore it does not need to be axially attached to the stem, and may be fixed to another member as long as it is rotatable coaxially.

[0040] 8, a locking portion 54 extending downward is formed on the protruding portion 52 protruding from the base portion 51, and when the handle is operated, this locking portion 54 comes into contact with the positioning portion 31, thereby restricting the rotation of the movable plate 50. This makes it possible to restrict the rotation range of the movable plate 50 relative to the positioning portion 31. As can be seen from the figure, when the stopper plate 40 and the movable plate 50 are attached to the stem 10, this locking portion 54 is configured to be inserted into the locking opening 45 of the stopper plate 40, thereby restricting the range of rotation of the stopper plate 40 relative to the movable plate 50.

[0041] 8, the stopper plate 40 is provided with an engagement opening 45 to enable engagement with the movable plate 50, but the stopper plate 40 may be formed with a protrusion, a convex portion, a recess, a cavity, a step, etc., and the movable plate 50 may be formed with an opening, a notch, a convex portion, a recess, a cavity, a step, etc., or a plurality of these may be provided. For example, the stopper plate 40 may be engaged with a notch provided in the movable plate 50, thereby engaging the stopper plate 40 with the movable plate. In addition, although the movable plate 50 is provided above the stopper plate 40 in FIG. 8, the stopper plate 40 may be provided above the movable plate 50, or the stopper plate 40 and the movable plate 50 may be spaced apart on the same axis, and in this case, an intervening member may be provided. In other words, the stopper plate 40 and the movable plate 50 rotate coaxially, and the rotation restriction of one plate restricts the rotation of the other plate (restricting the relative rotation range), and as long as the operating range of the rotary valve can be appropriately set by restricting the rotation of each plate, the shape and locking means of each plate can be set appropriately.

[0042] Furthermore, in this example, the locking portion 54 of the movable plate 50 abuts against the positioning portion 31 to position the movable plate and restrict its rotation, but the movable plate 50 may be formed with a protrusion, convex portion, protruding portion, recessed portion, indented portion, opening, notch, step portion, etc., or a plurality of these may be provided. For example, an opening may be formed in the movable plate 50, and the start and end points may be defined by the positioning portion 31 abutting against this opening. A notch may be formed in the movable plate 50, and the start and end points may be defined by the positioning portion 31 abutting against the notch. In other words, it is sufficient that the movable plate 50 abutting against the positioning portion 31 rotates coaxially with the stem 10, regardless of the stem 10, and that the starting point and end point of the movable plate 50 are determined by the positioning portion 31, thereby regulating the rotation range of the movable plate 50. Furthermore, the opening degrees of the stopper plate 40 and the movable plate 50 may be restricted by positioning portions, or the opening degrees may be restricted by the same positioning portion or a plurality of positioning portions.

[0043] Here, the rotation range of the movable plate 50 relative to the positioning portion 31 is the range in which the movable plate 50 can rotate until the locking portion 54 abuts against the positioning portion 31 (the range in which the movable plate 50 can rotate between the positioning portions 31). The rotation range of the stopper plate 40 relative to the movable plate 50 is the range within which the stopper plate 40 can rotate until the locking portion 54 locks from the first abutment portion 46a to the second abutment portion 46b (or from the second abutment portion 46b to the first abutment portion 46a) within the locking opening 45 of the stopper plate 40 (the range within which the stopper plate 40 can rotate until the locking portion 54 abuts within the locking opening 45). For this reason, the rotation range of movable member (movable plate) 50 relative to positioning portion 31 and the rotation range of stopper member (stopper plate) 40 relative to movable member (movable plate) 50 are combined to form a predetermined angle (for example, 90 degrees), thereby restricting the operating range of the rotary valve to a predetermined angle (for example, 90 degrees) and restricting the opening degree of the rotary valve. For example, if the combined rotation range of both is set to 90 degrees, the rotation range of handle 28 in the rotary valve will be 90 degrees.

[0044] Furthermore, when attaching the stopper structure of this example to a rotary valve, first, the fitting portion 43 of the stopper plate 40 is fitted into the two parallel surfaces 12 of the stem 10, and the stopper plate 40 is attached to the stem 10. Next, the stem 10 is inserted into the mounting hole 53 of the movable plate 50, and the movable plate 50 is attached to the stem 10. Thereafter, with the stopper plate 40 and the movable plate 50 attached to the stem 10, a C-shaped retaining ring 29 is attached to the groove of the stem 10 to prevent the stopper plate 40 and the movable plate 50 from coming off. In this manner, the stopper structure is attached to the rotary valve.

[0045] In this way, by combining two components, the stopper plate 40 and the movable plate 50, it is possible to restrict the rotation angle to a predetermined value by combining their combined rotation ranges. Therefore, compared to when a large rotation angle is ensured with only one component, the individual components can be made more compact, and the stopper structure can be installed in a limited space such as the shaft mounting portion of the valve body. It is also possible to configure an opening stopper structure with a small number of parts without using gland-related components such as gland flanges and gland bolts, which affect sealing performance, for positioning purposes.

[0046] Furthermore, in the opening / closing lock structure of this example, when the movable plate 50 abuts against the positioning portion 31 in the above-described opening stopper structure and the valve body 1 is in the fully closed or fully open state, the locking member 61 is passed through the hole 47 of the stopper plate 40 and locked, so that the positioning portion 31 is sandwiched between the locking member 61 and the engaging portion 54.

[0047] 6, which is a plan view of the fully open state, the locking portion 54 of the movable plate 50, the positioning portion 31, and the hole 47 of the stopper plate 40 are closely aligned. When the hole 47 formed in the stopper plate 40 is locked with a locking member (such as a padlock) 61 in this state (fully closed or fully open state), the positioning portion 31 can be sandwiched between the locking portion 54 of the movable plate 50 and the locking member 61. In the open / close lock structure, when the valve body 1 is in the fully closed or fully open state, if the locking member 61 is passed through the hole 47 and locked, the locking member 61 will come into contact with the positioning portion 31 and the stopper plate 40 will not be able to rotate in the direction returning from the fully closed or fully open position, and as a result, the rotational movement of the handle 28 will be restricted and the fully closed or fully open state will be fixed.

[0048] Next, the operation and function of the rotary valve opening stopper structure, the rotary valve lock structure, and the rotary valve of the present invention in the above-described embodiment will be described.

[0049] As an example of opening and closing operations, we will explain the case where the valve body 1 is operated from a fully open state to a fully closed state. Note that the same action occurs when rotating from a fully closed state to a fully open state, so detailed explanation will be omitted.

[0050] Figure 6 shows the fully open state of the valve body 1, and Figure 7 shows the fully closed state of the valve body 1. When the handle 28 is manually operated to rotate the ball valve element 8 from the fully open state to the fully closed state, the stopper plate 40 rotates together with the rotation of the stem 10, and in Figure 6 the stopper plate 40 rotates in the direction that fully closes the rotary valve.

[0051] The movable plate 50 is attached to the stem 10 in an uncoupled state, and therefore can rotate independently of the rotation of the stem 10. For this reason, when the handle 28 is operated, the movable plate 50 may rotate simultaneously with the stopper plate 40, the movable plate 50 may rotate later than the stopper plate 40, or the movable plate 50 may rotate before the stopper plate 40. In addition, the movable plate 50 may also rotate independently of the stopper plate 40.

[0052] When the movable plate 50 rotates to a predetermined position, the locking portion 54 of the movable plate 50 abuts against the positioning portion 31, and the positioning portion 31 acts as a stopper to position the movable plate 50, preventing the movable plate 50 from rotating in the predetermined direction, thereby restricting the rotation range of the movable plate 50. On the other hand, since the stopper plate 40 does not abut against the positioning member 31, the stopper plate 40 is rotatable regardless of the rotation restriction of the movable plate 50, and further rotates in the direction to bring the handle 28 into the fully closed state.

[0053] Movable plate 50 rotates between positioning portion 31, which is the start point, and positioning member 31, which is the end point, but the rotation range of movable plate 50 is less than 90 degrees. For this reason, movable plate 50 alone cannot restrict the rotation range of handle 28 to 90 degrees. However, in this example, after restricting the rotation range of movable plate 50, stopper plate 40 can further rotate within a predetermined range relative to movable plate 50, so that handle 28 can be rotated beyond the rotation range of movable plate 50.

[0054] Here, the rotation range (rotation range) of the stopper plate 40 relative to the movable plate 50 is determined as follows: The locking portion 54 of the movable plate 50 is locked in the locking opening 45 of the stopper plate 40, but the stopper plate 40 can rotate within the rotation range in which the locking portion 54 moves away from the state in which it abuts the first abutment portion 46a, approaches the second locking portion 46b, and then locks. The stopper plate 40 and the movable plate 50 each rotate around the axis of the stem 10, but can rotate independently without being linked to each other. Any of the following cases is possible: the stopper plate 40 rotates while the movable plate 50 is stationary, the movable plate 50 rotates while the stopper plate 40 is stationary, the two plates rotate in unison, or both plates rotate but do not rotate in unison. However, by providing a portion where the stopper plate 40 engages with the movable plate 50, even if they are capable of coaxial rotation independently of each other, it is possible for one plate to be involved in restricting the rotation of the other plate through restricting the rotation of the other plate.

[0055] In this example, as shown in Figure 7, when the locking portion 54 of the movable plate 50 locks with the second locking portion 46b of the stopper plate 40, the rotation of the stopper plate 40 in the rotation direction is restricted, thereby restricting the rotation of the stem 10 as well, restricting the operating range of the rotary valve to a predetermined opening, and as a result, restricting the rotation of the handle 28. That is, when the valve is in the fully closed state, the locking portion 54 of the movable plate 50 abuts against the positioning portion 31, and the locking portion 54 of the movable plate 50 is locked with the abutting portion 46b of the locking opening 45 of the stopper plate. In this state, the rotation range of the movable plate 50 is limited, and the rotation range of the stopper plate 40 is also limited, and the rotation of all plates is restricted, and finally the operating range of the rotary valve is restricted to a predetermined opening. Therefore, the rotation range of the movable member (movable plate) 50 relative to the positioning portion 31 and the rotation range of the stopper member (stopper plate) 40 relative to the movable member 50 are matched, so that the operating range of the rotary valve can be restricted to a predetermined angle.

[0056] In this way, even if the start point and end point of positioning stopper portion 32 are less than 90 degrees, stopper plate 40 can be further rotated after movable plate 50 abuts against positioning portion 31, and the operating range of the rotary valve can be adjusted to a predetermined angle (for example, 90 degrees) by the rotation range of movable plate 50 relative to positioning portion 31 and the rotation range of stopper plate 40 relative to movable plate 50. Therefore, the operating range of the rotary valve can be adjusted to a predetermined angle (for example, 90 degrees) without being affected by the start point and end point of positioning portion 31, which serves as a stopper.

[0057] The rotation range of the movable plate 50 relative to the positioning portion 31 is the range within which the movable plate 50 can rotate until the engaging portion 54 abuts the positioning portion 31, and the rotation range of the stopper plate 40 relative to the movable plate 50 is the range within which the stopper plate 40 can rotate until the engaging portion 54 engages with the first abutment portion 46a to the second abutment portion 46b within the engaging opening 45 of the stopper plate 40. Therefore, when setting the rotation range of the handle 28 that operates the rotary valve to, for example, 90 degrees, it is sufficient to make the combined rotation range of both the handles 28 and the stopper plate 40 90 degrees, so that the operating range of the rotary valve can be easily adjusted to 90 degrees despite the simple configuration.

[0058] Furthermore, the positioning portion 31, which is the starting point and the end point of the rotation range of the movable plate 50, utilizes the screw hole 6 for mounting the actuator, making it easy to determine the relative positional relationship of the positioning portion 31. The positioning portion uses the female screw portion 6 for mounting the actuator provided on the mounting portion 4 of the body 2 as a positioning stopper, which allows the starting point and the end point to be determined with precision, and therefore the rotational operating range of the rotary valve can be precisely adjusted to a specified angle (for example, 90 degrees). Furthermore, the female thread portion 6 for mounting the actuator is provided at a predetermined interval with high precision according to the standard, so even if the size of the valve is different, it can be used as is without machining a new female thread portion, and positioning can be ensured.

[0059] In addition, since the positioning portion 31 is screwed into the female thread portion 6 for mounting the actuator provided on the body 2, it is possible to use a portion unrelated to the ground portion as the stopper in the stopper structure, and since it will not come into contact with the ground portion even when the opening degree is restricted, it is possible to comply with international standards.

[0060] In the opening stopper structure, when the movable plate 50 abuts against the positioning portion 31 and the valve body 1 is in the fully closed or fully open state, the locking portion 54 of the movable plate 50, the positioning portion 31, and the hole portion 47 of the stopper plate 40 are aligned closely together. When the hole 47 formed in the stopper plate 40 is locked with a locking member (such as a padlock) 61 in this state (fully closed or fully open state), the positioning portion 31 can be sandwiched between the engaging portion 54 of the movable plate 50 and the locking member 61, thereby forming an opening / closing lock structure with a simple configuration.

[0061] In this way, when the components are in the predetermined positional relationship, inserting the locking member 61 into the hole 47 formed in the stopper plate 40 clamps the positioning portion 31 between the engaging portion 54 of the movable plate 50 and the locking member 61, thereby fixing the position of the movable plate 50 and also fixing the position of the stopper plate 40. By locking the locking member (e.g., a padlock, etc.) 61, the positions of the stopper plate 40 and the movable plate 50 are fixed, thereby fixing the handle 28 in a fully closed or fully open position, and thereby reliably preventing the handle from malfunctioning in a stable state.

[0062] In this way, simply by forming the key lock hole 47 in the stopper plate 40, the opening stopper structure can be provided with an open / close lock function. Furthermore, it is possible to provide a rotary valve having a simple structure, an opening stopper structure, and an open / close lock structure without affecting the gland at all.

[0063] The above describes in detail the embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the spirit of the invention described in the claims of the present invention. [Explanation of symbols]

[0064] 1 Valve body (rotary valve) 2 Body 3 Shaft mounting 6 Female thread 8 Valve body (ball valve body) 10 Stem 20 grand 28 Handle 31 Positioning part 32 Positioning stopper 40 Stopper member (stopper plate) 45 Locking opening 46 Contact part 46a 1st contact part 46b 2nd contact part 47 Hole 50 Movable member (movable plate) 54 Locking part 61 Locking member

Claims

1. An opening stopper structure for a rotary valve comprising: a stopper member that rotates coaxially and interlockingly with a stem that rotates a valve body within a body; a movable member that can rotate coaxially with the stem; and a positioning portion provided on the body that restricts the start and end points of the rotation range of the movable member to a positional relationship of less than a predetermined angle, wherein the stopper member is configured to restrict the rotation range relative to the movable member, and the rotation range of the movable member relative to the positioning portion and the rotation range of the stopper member relative to the movable member are combined to restrict the operating range of the rotary valve to the predetermined angle.

2. 2. The opening stopper structure of claim 1, comprising: a stopper member axially attached in a connected state to the stem; a movable member axially attached in an unconnected state to the stem; a positioning portion provided on the body for restricting the start and end points of the rotation range of the movable member to a range of less than 90 degrees; and a locking opening formed to lock a portion of the movable member to the stopper member, wherein the stopper member restricts the relative rotation range of the movable member by allowing the portion of the movable member to move only within the locking opening, and the rotation range of the movable member relative to the positioning portion and the rotation range of the stopper member relative to the movable member restricts the rotation range of the handle to 90 degrees.

3. 3. The opening stopper structure for a rotary valve according to claim 1, wherein the stopper member is plate-shaped, and the movable member is plate-shaped.

4. 4. The opening stopper structure of a rotary valve according to claim 1, wherein the positioning portion is constituted by a positioning stopper portion screwed into a female thread portion for mounting an actuator provided in the shaft mounting portion of the body.

5. 5. The opening / closing lock structure for a rotary valve according to claim 1, wherein when the movable member abuts against the positioning portion and the stopper member is restricted to a fully closed or fully open position relative to the movable member, causing the handle to be in a fully closed or fully open state, the positioning portion is fixed with a locking member so as to be sandwiched between the positioning portion and the movable member abutting against the positioning portion, thereby restricting the handle from rotating from that position.

6. A rotary valve using the opening stopper structure for a rotary valve according to any one of claims 1 to 5.

7. A rotary valve using the rotary valve opening / closing lock structure according to claim 5.

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