Extension bonnet type rotary valve

Abstract

To provide an extension bonnet type rotary valve which can be applied to both vertical piping and lateral piping.SOLUTION: An extension bonnet type rotary valve 1 has an extension bonnet 20 connected to a valve main body 10, a stem 30 rotatably inserted into the extension bonnet 20, and a valve body 40. In the extension bonnet 20, an expansion space 50 is formed between a bonnet-side diameter contraction step face 22 which is formed at an internal peripheral face 21a by a diameter contraction portion 21 in which a diameter contraction part 31 is inserted into an end part of the extension bonnet 20 at a side connected to the valve main body 10, and a stem-side diameter contraction step face 33 which is formed of a diameter contraction part 31 of the stem 30. In the expansion space 50, there is arranged a fluid movement adjustment part 60 which can release pressure in the extension bonnet 20 to the valve main body 10 side, and suppresses the movement of fluid into the extension bonnet 20 from the valve main body 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotary valve having a valve body that rotates while connected to a stem, and more particularly to an extension bonnet type rotary valve having an extension bonnet connected to a valve body. [Background technology]

[0002] Conventionally, rotary valves are provided with a gland packing at least on the upper part of the bonnet to prevent fluid leakage from around the axis of the stem. For example, in rotary valves that use low-temperature fluids of the -50°C class, the bonnet is extended to provide a so-called extension bonnet, which separates the valve body through which the fluid flows from the gland packing in order to prevent the gland packing from freezing and being damaged by the low-temperature fluid, or to prevent the operating handle located on the top of the bonnet from getting too cold.

[0003] For example, Patent Document 1 describes an extension bonnet valve in which a gland packing is provided on the upper part of the extension bonnet. This extended bonnet valve has a small diameter section on the valve body side of the valve stem that passes through the extended bonnet section, at a position on the valve stem that corresponds to the valve body side end face of the extended bonnet section, and one or two flange-shaped rings or split rings are fitted into this small diameter section, maintaining a constant small gap between the flange-shaped upper surface of the ring and the valve body side end face of the extended bonnet section, and between the inner wall of the gland section and the outer peripheral surface of the ring or split ring.This describes an extended bonnet valve that is configured so that the rings or split rings form a metal seal with the valve body side end of the extended bonnet section in abnormally high temperature conditions.

[0004] Such a rotary valve having an extension bonnet is used in so-called horizontal piping, in which the flow passages provided in the valve body are oriented horizontally. However, recently, there has been a demand for specifications that allow the valve body to be used in so-called vertical piping, in which the flow passages provided in the valve body are oriented vertically, that is, to be used in both horizontal and vertical piping. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Publication No. 62-73176 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the extension bonnet valve described in Patent Document 1, the valve body and the extension bonnet are not normally separated, so when the valve is tilted sideways to accommodate vertical piping, fluid easily flows into the extension bonnet. On the other hand, when used in vertical piping, if an abnormal increase in pressure occurs in the extension bonnet, the underside of the ring's flange abuts against the edge of the hole through which the small diameter portion of the valve stem of the valve body passes, making it impossible to release pressure to the valve body. These factors made it difficult to use in vertical piping.

[0007] The present invention was developed to solve the problems of the prior art, and its purpose is to provide an extension bonnet type rotary valve that can be applied to both vertical and horizontal piping. [Means for solving the problem]

[0008] In order to achieve the above object, the invention of claim 1 is an extension bonnet type rotary valve having an extension bonnet connected to a valve body, a stem rotatably inserted into the extension bonnet and with a reduced diameter section provided on the tip side inserted into the valve body, and a valve disc connected to the reduced diameter section on the tip side of the stem within the valve body and rotating together with the stem, wherein an expanded space is formed within the extension bonnet between a bonnet-side reduced diameter stepped surface formed on the inner circumferential surface by the reduced diameter section through which the reduced diameter section is inserted at the end of the extension bonnet on the side connected to the valve body, and a stem-side reduced diameter stepped surface formed by the reduced diameter section of the stem inserted into the extension bonnet, and the expanded space is provided with a fluid movement adjustment section which allows pressure within the extension bonnet to be released toward the valve body and which suppresses fluid movement from the valve body into the extension bonnet.

[0009] The invention of claim 2 is an extension bonnet type rotary valve in which the fluid movement adjustment part has an O-ring attached to the outer peripheral surface of the reduced diameter part of the stem so as to be able to slide freely on the outer peripheral surface of the reduced diameter part and the inner peripheral surface of the extension bonnet along the axial direction of the stem, and a pressure relief groove part formed in the tip part of the stem along the axial direction from the lower end of the expanded space to the inside of the valve body.

[0010] The invention of claim 3 is an extension bonnet type rotary valve in which the fluid movement adjustment section has a pair of annular plates attached to the reduced diameter section facing each other in the axial direction of the stem, and a spring provided between the pair of annular plates, the pair of annular plates being held in a position approximately perpendicular to the stem by the springs in opposite directions to block the space between the outer surface of the reduced diameter section and the inner surface of the extension bonnet, and the annular plates deform when pressure is applied, and have a pressure relief flow path that connects the front and back.

[0011] The invention of claim 4 is an extension bonnet type rotary valve in which the expanded space is formed by inserting the reduced diameter portion of the stem into the flow path of the valve body and then pulling it back into the extension bonnet when assembling the stem to the extension bonnet.

[0012] The invention of claim 5 is an extension bonnet type rotary valve in which a locking member attachment portion to which a predetermined locking member is attached is provided at the tip side of the reduced diameter portion of the stem, and the locking member attached to this locking member attachment portion is engaged with a part of the valve body from the valve body side, thereby preventing the stem from slipping out of the extension bonnet, and the axial length of the stem in the expanded space is set so that the locking member attachment portion can be positioned within the valve chamber of the valve body with the fluid movement adjustment portion sandwiched between the stem side reduced diameter step surface and the bonnet side reduced diameter step surface. [Effects of the Invention]

[0013] According to the invention of claim 1, an expanded space is formed within the extension bonnet between a bonnet-side reduced diameter step surface formed on the inner circumferential surface by the reduced diameter portion through which the reduced diameter section is inserted at the end of the extension bonnet that is connected to the valve body, and a stem-side reduced diameter step surface formed by the reduced diameter section of the stem inserted into the extension bonnet, and within this expanded space is provided a fluid movement adjustment section that allows pressure within the extension bonnet to be released toward the valve body and suppresses movement of fluid from the valve body into the extension bonnet. As a result, even when the extension bonnet rotary valve is used as so-called vertical piping with the flow path provided in the valve body oriented vertically, the fluid movement adjustment section provided in the expanded space of the extension bonnet prevents the fluid flowing through the flow path in the valve body from circulating within the extension bonnet, and moreover, the pressure within the extension bonnet is released toward the valve body. Therefore, even when the extension bonnet type rotary valve is used for vertical piping, low-temperature fluid of, for example, -50°C class can be circulated through the extension bonnet without freezing and damaging the gland packing etc. installed in the extension bonnet, and abnormal pressure rise inside the extension bonnet can be prevented. As a result, the valve can be applied to both vertical and horizontal piping.

[0014] According to the invention of claim 2, the fluid movement adjustment portion has an O-ring attached to the outer peripheral surface of the reduced diameter portion of the stem so as to be able to slide freely along the axial direction of the stem on the outer peripheral surface of the reduced diameter portion and the inner peripheral surface of the extension bonnet, and a pressure relief groove portion formed in the tip portion of the stem along the axial direction from the lower end of the expanded space to the inside of the valve body. As a result, the O-ring seals the gap between the outer surface of the stem and the extension bonnet inside the expanded space, preventing fluid from flowing from the valve body into the extension bonnet. If pressure inside the extension bonnet above the O-ring rises, the O-ring is pressed by that pressure and slides toward the lower end of the expanded space, releasing the pressure from inside the extension bonnet toward the valve body through the pressure relief groove in the stem. Therefore, the fluid movement adjusting portion can have a simple configuration consisting of an O-ring and a pressure relief groove portion formed in the stem.

[0015] According to the invention of claim 3, the fluid movement adjustment section has a pair of annular plates attached to the reduced diameter section facing each other in the axial direction of the stem, and a spring provided between the pair of annular plates, the pair of annular plates are subjected to elastic forces in opposite directions by the springs and are held in a position approximately perpendicular to the stem so as to block the space between the outer surface of the reduced diameter section and the inner surface of the extension bonnet, and have a pressure relief flow path that deforms when pressure is applied to connect the front and back. As a result, the pair of annular plates prevent fluid from flowing inward into the extension bonnet, and if the pressure inside the extension bonnet inside the annular plates increases, the annular plates are deformed by the increased pressure, and the pressure inside the extension bonnet is released to the valve body side through a pressure relief flow path that connects the front and back of the annular plates. Therefore, by using an annular plate made of a material that can accommodate various fluid temperatures as the fluid movement adjusting portion, it can be applied to both low-temperature and high-temperature fluids.

[0016] According to the invention of claim 4, the expanded space is a space formed when the stem is assembled to the extension bonnet by inserting the reduced diameter portion at the tip of the stem into the flow path of the valve body and then pulling it back into the extension bonnet and assembling it to the extension bonnet. As a result, the fluid movement adjustment portion is provided within the expanded space formed by assembling the stem, and therefore the expanded space formed by assembling the stem can be effectively utilized to provide the fluid movement adjustment portion.

[0017] According to the invention of claim 5, the axial length of the expanded space in the stem is set so that the locking member mounting portion can be positioned within the valve chamber of the valve body with the fluid movement adjustment portion sandwiched between the stem-side reduced diameter step surface and the bonnet-side reduced diameter step surface. As a result, the stem is assembled to the extension bonnet with the fluid movement adjusting portion provided, and the locking member is attached to the tip of the stem. Therefore, the fluid movement adjuster can be easily disposed in the expanded space at the same time as assembling the stem to the extension bonnet. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view of an extension bonnet type rotary valve according to a first embodiment of the present invention. [Figure 2]2A and 2B are cross-sectional views of the extension bonnet type rotary valve shown in FIG. 1, where FIG. 2A shows a state of horizontal piping and FIG. 2B shows a state of vertical piping. [Figure 3] FIG. 3 is an enlarged view of the periphery of a fluid flow adjustment section provided in the extension bonnet type rotary valve shown in FIG. 2. [Figure 4] 1 is a perspective view showing the periphery of a fluid movement adjustment section of an extension bonnet type rotary valve according to a first embodiment of the present invention, and is a see-through view showing the inside of the extension bonnet with the extension bonnet shown in imaginary lines. FIG. [Figure 5] 5A and 5B are cross-sectional views of an extension bonnet type rotary valve according to a second embodiment of the present invention, in which FIG. 5A shows a state of horizontal piping and FIG. 5B shows a state of vertical piping. [Figure 6] FIG. 6 is an enlarged view of the periphery of a fluid flow adjustment section provided in the extension bonnet type rotary valve shown in FIG. 5. [Figure 7] FIG. 10 is a perspective view showing the periphery of a fluid movement adjustment section of an extension bonnet type rotary valve according to a second embodiment of the present invention, and is a see-through view of the inside of the extension bonnet, with the extension bonnet shown in imaginary lines. [Figure 8] FIG. 6 is a perspective view of the annular plate shown in FIG. 5.

[0019] An embodiment of an extension bonnet rotary valve according to the present invention will be described in detail with reference to FIGS. It should be noted that the present disclosure is not limited to the embodiments shown below. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may include portions in which the dimensional relationships and ratios differ from one another. Fig. 1 is a perspective view of an extension bonnet type rotary valve 1 according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view of the extension bonnet type rotary valve 1 shown in Fig. 1. Fig. 3 is an enlarged view of the periphery of a fluid flow adjustment unit 60 provided in the extension bonnet type rotary valve 1 shown in Fig. 2. Fig. 4 is a perspective view showing the periphery of the fluid flow adjustment unit 60 of the extension bonnet type rotary valve 1 according to the first embodiment of the present invention, and is a see-through view of the inside of the extension bonnet 20, with the extension bonnet 20 shown in imaginary lines. The extension bonnet rotary valve 1 according to the first embodiment of the present invention is used to control cold / warm fluids, for example, at temperatures of -50°C class, and comprises a valve body 10, an extension bonnet 20 connected to the valve body 10, a stem 30 rotatably inserted into the extension bonnet 20, a valve element 40 connected to a reduced diameter portion 31 at the tip side of the stem 30 and rotating together with the stem 30, and an operating handle (not shown) that is detachably attached to the end of the stem 30 protruding from the upper end opening 20a of the extension bonnet 20.

[0020] <About the valve body 10> The valve body 10 has an inlet-side flow path 11 and an outlet-side flow path 12 of approximately the same diameter inside, which are arranged so that the flow paths can be freely connected or blocked via a valve body 40, and flange portions 11a and 12a are provided on the inlet side of the inlet-side flow path 11 and the outlet side of the outlet-side flow path 12, which serve as connection parts with the piping. The valve body 10 has a cylindrical connecting portion 13 that serves as the connecting portion with the extension bonnet 20, and has an opening formed therein through which the stem 30 connected to the valve body 40 is inserted, corresponding to the position where the valve body 40 is to be installed.

[0021] In the first embodiment, the valve element 40 is a ball valve element, and has a substantially spherical portion and a through passage 41 formed with substantially the same diameter as the inlet flow passage 11 and the outlet flow passage 12. The valve element 40 is rotatably supported by annular ball seats 51, 52 provided on the connection sides of the inlet flow path 11 and the outlet flow path 12 with the through passage 41 so that it can rotate together with the stem 30 within the valve chamber 14 provided in the valve body 10.

[0022] <About the Extension Bonnet 20> The extension bonnet 20 is roughly cylindrical, allowing the stem 30 to be inserted thereinto so as to be freely rotatable, and has a connecting step surface 20b formed on the outer surface by reducing the diameter of the end that is connected to the valve body 10. The extension bonnet 20 is connected to the valve body 10 by welding or the like, with the upper end surface of the cylindrical connecting portion 13 of the valve body 10 abutting against this connecting step surface 20b. In this way, inside the extension bonnet 20, which has a reduced diameter portion 21 at the end on the connecting side with the valve body 10, a bonnet side reduced diameter step surface 22 is formed on the inner surface 21a by the reduced diameter portion 21. In addition, the extension bonnet 20 is formed into a long neck shape with an expanded axial dimension to separate the valve body 10, through which the fluid flows, from the gland packing P, and is provided with the gland packing P at its upper end, which seals the upper end opening 20a with the stem 30 inserted therethrough.

[0023] <About Stem 30> The stem 30 is provided with an enlarged axial dimension corresponding to the extension bonnet 20, and has a reduced diameter portion 31 formed at the end on the side connected to the valve element 40. A valve element connecting portion 32 that connects to the valve element 40 is provided at the tip of the reduced diameter portion 31 of the stem 30. In addition, at the end of the reduced diameter portion 31 around the valve body connecting portion 32, a pin hole 31b is formed into which a locking pin 70, which functions as a locking member to prevent the stem 30 from slipping out of the upper end opening 20a of the extension bonnet 20, is inserted with both ends protruding. In other words, the pin hole 31b functions as a locking member attachment portion. When an external force acts on the stem 30 to pull the stem 30 out of the upper end opening 20a of the extension bonnet 20, the locking pin 70 fitted into this pin hole 31b comes into contact with the locked annular protrusion 13a provided on the inner circumferential surface of the cylindrical connecting portion 13 of the valve body 10, thereby preventing the stem 30 from slipping out of the upper end opening 20a of the extension bonnet 20. For example, when a high-pressure fluid flows, the fluid may enter the gap between the valve chamber 14 and the valve element 40 (the so-called cavity) from the flow path through the gap between the valve element opening and the annular ball seats 51, 52 when the valve element is at an intermediate opening, or through a gap created by the movement of the valve element when the valve element is fully closed. When this pressure acts on the stem 30, a force may be applied to the stem 30 in the upward direction in the figure, that is, a force that may cause the stem 30 to jump out from the top of the extension bonnet 20. Therefore, a locking pin 70 or a flange that can be locked inside the valve chamber 14 is provided at the tip of the stem 30 inside the valve chamber 14, so that when force is applied in the direction that the stem 30 pops out, it is locked inside the valve chamber 14 and the stem 30 does not rise. To achieve this, the locking pin 70 etc. must have a diameter larger than the inner diameter of the extension bonnet 20, so the locking pin 70 etc. cannot be passed through the extension bonnet 20 while already attached to the stem 30. Therefore, during assembly, it is necessary to insert the stem 30 into the extension bonnet 20 without attaching the locking pin 70, etc., and then lower the tip into the valve chamber 14 before attaching the locking pin 70, etc. As will be described later, the expanded space 50 provided between the stem 30 and the extension bonnet 20 is necessary to perform this procedure during assembly.

[0024] Furthermore, the axial length of the reduced diameter portion is set to a dimension that enables the stem 30 to be inserted into the extension bonnet 20 from the upper end opening 20a until the pin hole 31b of the stem 30 is positioned within the valve chamber 14 of the valve body 10.

[0025] The reduced diameter portion 31 is provided with a rotary bearing 71 for preventing the stem 30 from coming into contact with the inner peripheral surface of the extension bonnet 20 and being damaged. The inner circumferential side of the rotary bearing 71 is fitted into a groove provided in the stem 30 and fixed to the stem 30, while the outer circumferential side is spaced apart from the inner circumferential surface of the reduced diameter portion 21 of the extension bonnet 20. Here, the rotary bearing 71 has the function of preventing the stem 30 from coming into contact with the inner circumferential surface of the extension bonnet 20 and being damaged when, for example, fluid pressure is applied to the valve disc 40, causing the valve disc 40 to move slightly in the radial direction and tilt the stem 30. On the other hand, the valve element 40 may move slightly under fluid pressure and be pressed against one of the annular ball seats 51, 52 to improve sealing performance, but if the outer periphery of the rotary bearing 71 is always in contact with the inner periphery of the extension bonnet 20, this movement of the valve element 40 may be hindered, and sufficient sealing performance may not be achieved. Therefore, the outer periphery of the rotary bearing 71 is separated from the inner periphery of the extension bonnet 20. As a result, when fluid flows from the valve body 10 into the extension bonnet 20, the rotary bearing 71 is unable to stop the fluid.

[0026] <Regarding the expanded space 50 formed in the extension bonnet 20> Here, the expanded space 50 formed inside the extension bonnet 20 will be described. Within the extension bonnet 20, an expanded space 50 is formed between a bonnet-side reduced diameter step surface 21 formed on the inner surface by the reduced diameter portion through which the reduced diameter portion 31 of the stem 30 is inserted at the end connected to the valve body 10, and a stem-side reduced diameter step surface 33 formed by the reduced diameter portion 31 of the stem 30 inserted into the extension bonnet 20.

[0027] This expanded space 50 is a space formed by the assembly procedure described below, which is necessary to attach a locking pin 70 to the stem 30 to prevent it from slipping out of the upper end opening 20a of the extension bonnet 20 when assembling the stem 30 to the extension bonnet 20. The length of this expanded space 50 in the axial direction of the stem 30 is set so that the locking pin 70 can be attached to the stem 30 by an assembly procedure that will be described later. The expanded space 50 is an expanded space 50 that is inevitably generated during the assembly procedure in which the stem 30 is inserted into the valve chamber 14 of the valve body 10 and then pulled back in order to attach the locking pin 70 to the stem 30. However, the vertical distance of this space may be further adjusted in accordance with the fluid movement adjustment section 60 provided in this expanded space 50. For example, when the stem 30 is lowered until the pin hole 31b provided at the tip side of the stem 30 is exposed inside the valve chamber 14 of the valve body 10, with the fluid movement adjustment section 60 provided on the stem 30, the axial length of the expanded space 50 of the stem 30 must be a distance that allows the pin hole 31 to be positioned inside the valve chamber 14 with the fluid movement adjustment section 60 sandwiched between the stem side reduced diameter step surface 33 and the bonnet side reduced diameter step surface 22. Therefore, in order to attach the locking pin 70 to the stem 30, the expanded space 50 that inevitably occurs from the assembly procedure of inserting and pulling back the stem 30 described above may be further expanded in the axial direction of the stem 30 depending on the specifications of the fluid movement adjustment section 60.

[0028] <Regarding the fluid movement adjustment portion 60 provided in the expanded space 50> A fluid movement adjusting portion 60 is provided in the expanded space 50 formed in the extension bonnet 20 . The fluid movement adjusting portion 60 allows the pressure inside the extension bonnet 20 to be released to the valve body 10 side, and also suppresses the movement of fluid through the inside of the extension bonnet 20. The fluid movement adjustment portion 60 of the first embodiment has an O-ring 61 attached to the stem 30 and a pressure relief groove portion 62 formed at the tip of the stem 30.

[0029] The O-ring 61 is made of an elastic material and is attached to the outer peripheral surface 31a of the reduced diameter portion 31 of the stem 30 along the axial direction of the stem 30 so as to be freely slidable on the outer peripheral surface 31a of the reduced diameter portion 31 and the inner peripheral surface 21a of the extension bonnet 20. This O-ring 61 seals the gap between the outer peripheral surface 31a of the reduced diameter portion 31 of the stem 30 and the inner peripheral surface 21a of the extension bonnet 20 within the expanded space 50, and when pressure rises against the O-ring 61 on the side of the upper end opening 20a of the extension bonnet 20 inside the extension bonnet 20, the O-ring 61 slides against the outer peripheral surface 31a of the reduced diameter portion 31 and the inner peripheral surface 21a of the extension bonnet 20, and is pressed by the increased pressure and moved to the side of the extension bonnet 20 that is connected to the valve body 10. The O-ring 61 is preferably made of an elastic material that is highly resistant to cold and chemicals.

[0030] The pressure relief groove portion 62 is a groove formed in the tip portion of the stem 30 along the axial direction from the lower end region of the expanded space 50 to the region inside the valve body 10, and in this embodiment is a single V-groove extending linearly in the axial direction. In other words, the pressure relief groove portion 62 is a groove formed in the outer surface 31a of the stem 30 so as to extend linearly from the lower end region of the expanded space 50, which interferes with the O-ring 61 that has moved due to the pressure inside the extension bonnet 20 as described above, to the region inside the valve body 10. In this embodiment 1, the pressure relief groove portion 62 is exemplified as being formed by a single V-groove, but the number and shape of the pressure relief groove portion 62 are not limited to this as long as they can effectively release the pressure inside the extension bonnet 20 toward the valve body 10 while suppressing the inflow of fluid from the valve body 10 into the extension bonnet 20. Here, the fluid movement adjustment unit 60 does not have to be able to completely seal the movement of fluid between the valve body 10 side and the extension bonnet 20 side. When the extension bonnet type rotary valve 1 is connected to vertical piping, the extension bonnet 20 is oriented horizontally, and the fluid flowing through the flow path of the valve body 10 can easily flow into the extension bonnet 20. If the fluid is a low-temperature fluid, when the fluid comes into contact with the gland packing P, problems such as the gland packing P freezing can occur. The purpose of providing the fluid movement adjustment section 60 is to prevent such freezing, but normally the gland packing P does not freeze immediately when it comes into contact with a low-temperature fluid, and the extension bonnet 20 is long enough that the fluid is often vaporized by the time it reaches the gland packing P, or its temperature is already high. Therefore, it is permissible to some extent for the fluid to pass through the fluid movement adjustment portion 60 and flow into the extension bonnet 20. The extent of the fluid inflow is not necessarily fixed, but it is sufficient that the amount of inflow is not such that the fluid continues to flow into the extension bonnet 20, contacts the gland packing P, and then returns to the valve body 10, causing the fluid to continuously circulate within the extension bonnet 20. As an example, the inflow amount may be such that at least a portion of the fluid that has passed through the fluid movement adjustment portion 60 is vaporized before it reaches the gland packing P.

[0031] <Procedure for assembling the stem 30 into the extension bonnet 20> Here, the procedure for assembling the stem 30 into the extension bonnet 20 will be described. In the first embodiment, the stem 30 is assembled to the extension bonnet 20 connected to the valve body 10. First, the worker attaches the O-ring 61 to the reduced diameter portion 31 of the stem 30 . The mounting position of the O-ring 61 on the stem 30 may be, for example, in the upper region of the reduced diameter portion 31 where the O-ring 61 does not interfere with the pressure relief groove portion 62 when the stem 30 is completely assembled to the extension bonnet 20.

[0032] Next, the worker inserts the stem 30 with the O-ring 61 attached thereto through the upper end opening 20a of the extension bonnet 20 until the pin hole 31b is positioned within the valve chamber 14 of the valve body 10. When inserting the stem 30 into the extension bonnet 20, the O-ring 61 Its outer diameter side comes into contact with the inner surface of the extension bonnet 20 and tends to remain in place, so it tends to move upward relative to the stem 30, but its upward movement beyond the reduced diameter portion 31 is prevented by its contact with the stem-side reduced diameter step surface 33.

[0033] Next, the worker inserts the stem into the pin hole 31b exposed in the valve chamber 14 of the valve body 10, and fits the locking pin 70 through the flow paths 11 and 12 so that both ends protrude from the pin hole 31b.

[0034] Finally, the worker pulls up the stem 30 to the position where the extension bonnet 20 is completely attached, and fixes the stem 30 to the extension bonnet 20 by attaching the gland packing P. In this way, after inserting the stem 30 into the extension bonnet 20 to attach the locking pin 70 to the end of the stem 30, by pulling it back to the specified attachment position, an expanded space 50 is formed between the bonnet side reduced diameter step surface 21 and the stem side reduced diameter step surface 33. Furthermore, when the stem 30 is pulled back, the O-ring 61 comes into sliding contact with the outer surface 31a of the reduced diameter portion 31 of the stem 30 and the inner surface 21a of the extension bonnet 20, and is more likely to remain near the bonnet-side reduced diameter step surface 21 rather than being pulled back together with the stem 30. However, ideally, high sealing performance can be achieved by positioning the O-ring 61 so that it rises somewhat together with the stem 30 and does not interfere with the pressure relief groove 62. Even in this case, if the pressure inside the extension bonnet 20 increases, the O-ring 61 is pushed down to the position of the pressure relief groove 61, enabling pressure relief. For example, by adjusting the surface roughness of the outer peripheral surface 31a of the reduced diameter portion 31 and the inner peripheral surface 21a of the extension bonnet 20, it is possible to set the O-ring 61 to be disposed in such a preferable position. Furthermore, even if the O-ring 61 is positioned so as to interfere with the pressure relief groove 62, only a small amount of fluid flows through the pressure relief groove 62 past the O-ring 61 into the interior of the extension bonnet 20, and when the pressure rises, the fluid that does flow in is discharged together with the gas through the pressure relief groove 62 to the valve body 10 side.

[0035] <Operation of the fluid flow adjustment unit 60 when the extension bonnet type rotary valve 1 is used in vertical piping> When the extension bonnet rotary valve 1 is used in vertical piping as shown in FIG. 2( b), the axis of the extension bonnet 20 is horizontal, so that the low-temperature fluid flowing from the inlet flow path 11 of the valve body 10 toward the outlet flow path 12 can easily flow into the extension bonnet 20. However, the O-ring 61 provided in the expanded space 50 prevents the low-temperature fluid from flowing toward the upper end opening 20 a of the extension bonnet 20, preventing the low-temperature fluid from circulating inside the extension bonnet 20. Furthermore, when the pressure in the space on the upper end opening 20a side of the extension bonnet 20 relative to the O-ring 61 increases due to, for example, the evaporation of the low-temperature fluid, the O-ring 61 is moved by the pressure to the end of the expanded space 50 that is connected to the valve body 10 (see O-ring 61 shown by the imaginary line in Figure 2(b)), and the pressure is released toward the valve body 10 through the pressure relief groove portion 62.

[0036] <Effects of the First Embodiment> As described above, in the extension bonnet type rotary valve 1 according to the first embodiment, an expanded space 50 is formed within the extension bonnet 20 between the bonnet-side reduced diameter step surface 22 formed on the inner circumferential surface 21a by the reduced diameter portion 21, through which the reduced diameter section 31 is inserted, at the end of the extension bonnet 20 on the side connected to the valve body 10, and the stem-side reduced diameter step surface 33 formed by the reduced diameter section 31 of the stem 30 inserted into the extension bonnet 20. A fluid movement adjustment section 60 is provided within this expanded space 50, which allows the pressure within the extension bonnet 20 to be released toward the valve body 10, and suppresses the movement of fluid from the valve body 10 into the extension bonnet 20. As a result, even when the extension bonnet rotary valve 1 is used as so-called vertical piping in which the flow paths 11, 12 provided in the valve body 10 are oriented vertically, the fluid movement adjustment part 60 provided in the expanded space 50 of the extension bonnet 20 prevents the fluid flowing through the flow paths of the valve body 10 from circulating within the extension bonnet 20, and moreover, the pressure within the extension bonnet 20 is released to the valve body 10 side. Therefore, even when the extension bonnet type rotary valve 1 is used for vertical piping, low-temperature fluid of, for example, about -50°C is circulated through the extension bonnet 20, and the gland packing P and the like provided in the extension bonnet 20 will not be frozen and damaged, and abnormal pressure rise inside the extension bonnet 20 can be prevented. As a result, the extension bonnet type rotary valve 1 can be applied to both vertical piping and horizontal piping.

[0037] Furthermore, in the extension bonnet type rotary valve 1 according to embodiment 1, the fluid movement adjustment section 60 has an O-ring 61 attached to the outer peripheral surface 31a of the reduced diameter section 31 of the stem 30 along the axial direction of the stem 30 so as to be able to slide freely on the outer peripheral surface 31a of the reduced diameter section 31 and the inner peripheral surface 21a of the extension bonnet 20, and a pressure relief groove section 62 formed at the tip of the stem 30 along the axial direction from the lower end of the expanded space 50 to the inside of the valve body 10. As a result, the O-ring 61 seals the gap between the outer peripheral surface 31a of the stem 30 and the inner peripheral surface 21a of the extension bonnet 20 within the expanded space 50, preventing fluid from flowing from the valve body 10 into the extension bonnet 20. If the pressure within the extension bonnet 20 above the O-ring 61 increases, the O-ring 61 is pressed by the pressure and slides toward the lower end of the expanded space 50, and the pressure is released from within the extension bonnet 20 toward the valve body 10 through the pressure relief groove 62 of the stem 30. Therefore, the fluid movement adjusting portion 60 can have a simple configuration consisting of the O-ring 61 and the pressure relief groove portion 62 formed in the stem 30 .

[0038] Furthermore, in the extension bonnet type rotary valve 1 according to embodiment 1, the expanded space 50 is a space formed when assembling the stem 30 to the extension bonnet 20 by inserting the reduced diameter portion 31 at the tip of the stem 30 into the valve chamber 14 of the valve body 10 and then pulling it back into the extension bonnet 20 and assembling it to the extension bonnet 20. As a result, the fluid movement adjustment section 60 is provided within the expanded space 50 formed by assembling the stem 30, so that the expanded space 50 formed by assembling the stem 30 can be effectively utilized to provide the fluid movement adjustment section 60.

[0039] Furthermore, in the extension bonnet type rotary valve 1 according to embodiment 1, the axial length of the stem 30 of the expanded space 50 is set so that the pin hole 31b can be positioned within the valve chamber 14 of the valve body 10 with the fluid movement adjustment section 60 sandwiched between the stem side reduced diameter step surface 33 and the bonnet side reduced diameter step surface 22. As a result, the stem 30 is assembled to the extension bonnet 20 with the fluid movement adjuster 60 provided, and the locking pin 70 is attached to the tip of the stem 30 . Therefore, the fluid movement adjuster 60 can be easily disposed in the expanded space 50 together with assembling the stem 30 to the extension bonnet 20 .

[0040] (Embodiment 2) Next, an extension bonnet type rotary valve 2 according to a second embodiment will be described with reference to FIGS. Fig. 5 is a cross-sectional view of an extension bonnet type rotary valve 2 according to a second embodiment of the present invention, where (a) shows a state of horizontal piping and (b) shows a state of vertical piping. Fig. 6 is an enlarged view of the periphery of a fluid flow adjustment unit 160 provided in the extension bonnet type rotary valve 2 shown in Fig. 5. Fig. 7 is a perspective view showing the periphery of the fluid flow adjustment unit 160 of the extension bonnet type rotary valve 2 according to the second embodiment of the present invention, and is a see-through view of the inside of the extension bonnet 20, with the extension bonnet shown in imaginary lines. Fig. 8 is a perspective view of the annular plate 161 shown in Fig. 5. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted. The extension bonnet type rotary valve 2 of the second embodiment differs from the extension bonnet type rotary valve 1 of the first embodiment in that a fluid movement adjustment part 160 having a pair of annular plates 161, 162 is provided in the expanded space 50 of the extension bonnet 20. The vertical distance of the expanded space 50 in the second embodiment can be set in the same way as in the first embodiment.

[0041] <Regarding the fluid movement adjustment portion 160 provided in the expanded space 50> The fluid movement adjustment section 160 of the extension bonnet type rotary valve 2 of embodiment 2 has a pair of annular plates 161, 162 attached to the reduced diameter section 31 facing each other in the axial direction of the stem 30, and a spring 163 provided between the pair of annular plates 161, 162.

[0042] The pair of annular plates 161, 162 are held in a position perpendicular to the stem 30 by the resilient force of a spring 163 in opposite directions, and are arranged in the expanded space 50 so as to block the space between the outer peripheral surface 31a of the reduced diameter portion 31 and the inner peripheral surface 21a of the extension bonnet 20, and have a pressure relief flow path 164 that deforms when pressure is applied to connect the front and back.

[0043] As shown in FIG. 8, the annular plate 161 is an annular flat plate, and is bias cut to form a pressure relief flow path 164. Although only one annular plate 161 is shown in FIG. 8, the other annular plate 162 has a similar shape although the inner diameter is slightly different. In the second embodiment, the annular plates 161 and 162 are made of PTFE (polytetrafluoroethylene). The annular plates 161 and 162 are preferably made of a material that is highly resistant to cold and chemicals. The inner diameter of each annular plate 161, 162 is set to a dimension that is approximately the same as or slightly larger than the inner diameter of the reduced diameter portion 31 of the stem 30, and the outer diameter is set to a dimension that is approximately the same as or slightly smaller than the inner diameter of the area that forms the expanded space 50 of the extension bonnet 20. As with the O-ring 61 described above, the annular plate 161 does not necessarily need to completely seal the fluid, so it is advantageous for assembly and stem rotation to have an outer diameter that is slightly smaller than the inner diameter of the extension bonnet 20.

[0044] The spring 163 is made of, for example, metal, and is held in an elastically compressed state in the axial direction of the stem 30 between the pair of annular plates 161, 162 so as to apply a resilient force to both annular plates 161, 162 when the pair of annular plates 161, 162 are placed at predetermined mounting positions within the expanded space. The spring 163 presses the annular plates 161 and 162 in a direction separating them from each other in the axial direction of the stem 30 so that the annular plates 161 and 162 are held in a position perpendicular to the stem 30 .

[0045] More specifically, a plate locking groove 170 is formed at the upper end of the reduced diameter portion 31 of the stem 30, into which the inner diameter side end of one of the annular plates 161 is fitted, and the annular plate 161 fitted into this plate locking groove 170 is pressed in the axial direction of the stem 30 by a spring 163, thereby being pressed against the horizontal inner groove surface of the plate locking groove 170 and held in a horizontal position. In addition, the other annular plate 162 is pressed by a spring 163 in the axial direction of the stem 30 so that the edge of the annular plate 162 abuts against the edge portion 23 formed by the bonnet-side reduced-diameter step surface 22 of the extension bonnet 20 and the inner surface 21a that forms the expanded space 50, and is held in a horizontal position.

[0046] <Procedure for assembling the stem 30 into the extension bonnet 20> Here, the procedure for assembling the stem 30 into the extension bonnet 20 will be described. In the second embodiment, similarly to the first embodiment, the stem 30 is assembled to the extension bonnet 20 connected to the valve body 10. First, the worker inserts one annular plate 161, the spring 163, and the other annular plate 162 into the reduced diameter portion 31 of the stem 30 from the tip side of the stem 30 in that order, and with one annular plate 161 fitted into the plate locking groove 170, inserts the stem 30 through the upper end opening 20a of the extension bonnet 20. Then, the operator inserts the stem 30 until the pin hole 31b formed in the stem 30 is positioned within the valve chamber 14 of the valve body 10. At this time, the annular plate 162 located at the tip side of the stem 30 abuts against the above-mentioned edge portion 23 of the extension bonnet 20, and the spring 163 is compressed between the annular plate 161 engaged in the plate engagement groove 170 of the stem 30 and the annular plate 162 abutting against the edge portion 23.

[0047] Next, the worker fits the locking pin 70 into the pin hole 31b via the flow paths 11 and 12 so that both ends of the locking pin 70 protrude from the pin hole 31b.

[0048] Finally, the worker pulls up the stem 30 to the position where the extension bonnet 20 is completely attached, and fixes the stem 30 to the extension bonnet 20 by attaching the gland packing P. In this way, in order to attach the locking pin 70 to the end of the stem 30, the stem 30 is inserted into the extension bonnet 20 and then pulled back to the specified attachment position, thereby forming an expanded space 50 between the bonnet-side reduced diameter step surface 22 and the stem-side reduced diameter step surface 33. When the stem 30 is completely attached to the extension bonnet 20 , the pair of annular plates 161 , 162 are biased in opposite directions by the spring 163 and are held in a position perpendicular to the stem 30 .

[0049] <Operation of the fluid flow adjustment unit 160 when the extension bonnet type rotary valve 2 is used in vertical piping> When the extension bonnet rotary valve 2 is used in vertical piping as shown in FIG. 5( b), the axis of the extension bonnet 20 is horizontal, so that the low-temperature fluid flowing through the valve body 10 from the inlet flow path 11 toward the outlet flow path 12 easily flows into the extension bonnet 20. However, the pair of annular plates 161, 162 provided in the expanded space 50 prevent the low-temperature fluid from flowing toward the upper end opening 20 a of the extension bonnet 20 relative to the pair of annular plates 161, 162, and prevents the low-temperature fluid from circulating inside the extension bonnet 20. Examples of low-temperature fluids that can be applied to the extension bonnet type rotary valve 2 of this embodiment include refrigerants, brine, and other fluids such as propane, which liquefy at a temperature of about -50°C. Furthermore, when the pressure in the space on the upper end opening 20a side of the extension bonnet 20 relative to the pair of annular plates 161, 162 increases due to, for example, evaporation of the low-temperature fluid, the pressure causes the pressure relief flow paths 164 of each annular plate 161, 162 to deform in order, starting from the annular plate 161 on the upper end opening 20a side, and connects the front and back of the annular plates 161, 162, thereby releasing the pressure toward the valve body 10. These annular plates 161, 162 are made of a resin material such as polytetrafluoroethylene (PTFE), and are therefore relatively soft. Therefore, if a bias-cut pressure relief flow path 164 is provided, when the pressure inside the extension bonnet 20 increases, the pressure relief flow path 164 can be deformed by being pushed out, thereby allowing the pressure to be released toward the valve body 10. However, the method of depressurizing using the annular plates 161, 162 is not limited to this method. For example, the plates may be provided with small holes for depressurizing, or even if a depressurizing flow path 164 is not provided, it may be possible to depressurize by deforming the plates themselves.

[0050] <Effects of the Second Embodiment> As described above, according to the extension bonnet type rotary valve 2 of embodiment 2, similarly to the extension bonnet type rotary valve 1 of embodiment 1, an expanded space 50 is formed inside the extension bonnet 20 between the bonnet-side reduced diameter step surface 22 formed on the inner circumferential surface 21a by the reduced diameter portion 21, through which the reduced diameter section 31 is inserted, at the end of the extension bonnet 20 on the side connected to the valve body 10, and the stem-side reduced diameter step surface 33 formed by the reduced diameter section 31 of the stem 30 inserted into the extension bonnet 20, and a fluid movement adjustment section 160 is provided inside the expanded space 50, which allows the pressure inside the extension bonnet 20 to be released to the valve body 10 side and suppresses the movement of fluid from the valve body 10 into the extension bonnet 20. Therefore, similarly to the extension bonnet type rotary valve 1 according to the first embodiment, even when the extension bonnet type rotary valve 2 is used as vertical piping, a low-temperature fluid of, for example, about -50°C is circulated through the extension bonnet 20, and the gland packing P and the like provided in the extension bonnet 20 will not be frozen and damaged, and moreover, an abnormal pressure rise inside the extension bonnet 20 can be prevented, and as a result, the extension bonnet type rotary valve 2 can be applied to both vertical piping and horizontal piping.

[0051] Furthermore, in the extension bonnet type rotary valve 2 according to the second embodiment, the fluid movement adjustment section 160 has a pair of annular plates 161, 162 attached to the reduced diameter section 31 facing each other in the axial direction of the stem 30, and a spring 163 provided between the pair of annular plates 161, 162, and the pair of annular plates 161, 162 are held in a position approximately perpendicular to the stem 30 by the resilient force of the spring 163 in opposite directions to each other so as to block the space between the outer peripheral surface 31a of the reduced diameter section 31 and the inner peripheral surface 21a of the extension bonnet 20, and has a pressure relief flow path 164 that deforms when pressure is applied to connect the front and back. As a result, the pair of annular plates 161, 162 prevent fluid from flowing inward into the extension bonnet 20, and when the pressure inside the extension bonnet 20 above the annular plates 161, 162 increases, the annular plates 161, 162 are deformed by the increased pressure, and the pressure inside the extension bonnet 20 is released to the valve body 10 side through a pressure relief flow path 164 that connects the front and back of the annular plates 161, 162. Therefore, by using annular plates 161 and 162 made of a material that can accommodate various fluid temperatures as fluid movement adjuster 160, it can be applied to both low-temperature and high-temperature fluids.

[0052] Furthermore, in the extension bonnet type rotary valve 2 of embodiment 2, similar to the extension bonnet type rotary valve 1 of embodiment 1, the expanded space 50 is a space formed when assembling the stem 30 to the extension bonnet 20 by inserting the reduced diameter portion 31 of the stem 30 into the valve chamber 14 of the valve body 10 and then pulling it back into the extension bonnet 20 and assembling it to the extension bonnet 20. As a result, the fluid movement adjustment section 160 is provided within the expanded space 50 formed by assembling the stem 30, and as with the extension bonnet type rotary valve 1 of embodiment 1, the expanded space 50 formed by assembling the stem 30 can be effectively utilized to provide the fluid movement adjustment section 160.

[0053] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure.

[0054] In the above-described first and second embodiments, the extension bonnet type rotary valves 1 and 2 are described as ball valves in which the valve element 40 is a ball, but the extension bonnet type rotary valve is not limited to a ball valve and other rotary valves may be used. For example, a butterfly valve may be used as the extension bonnet type rotary valve.

[0055] In the above-mentioned first and second embodiments, low-temperature fluids are illustrated as flowing through the extension bonnet type rotary valves 1 and 2, but the extension bonnet type rotary valve can also be used for high-temperature fluids. When used for high-temperature fluids, it is advisable to use materials with excellent heat resistance for both the O-ring and the annular plate.

[0056] Furthermore, in the second embodiment described above, one of the pair of annular plates 161, 162, the annular plate 161, is fitted into the plate locking groove 170 formed in the stem 30. However, for example, the stem may not be provided with a plate locking groove, and both annular plates may be provided so as to be movable in the axial direction of the stem within the expanded space. Alternatively, for example, a groove may be formed in the stem 30 having an axial width that allows the annular plate 162, located on the tip side of the stem 30, to move axially in accordance with the expansion and contraction of the spring 163 when the stem 30 is inserted into the extension bonnet 20, and the annular plate 162, located on the tip side of the stem 30, may be fitted into that groove.

[0057] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive, and the above embodiments may be omitted, substituted, or modified in various ways without departing from the scope and spirit of the appended claims. [Explanation of symbols]

[0058] 1, 2 Extension bonnet type rotary valve 10 Valve body 11 Inlet side flow path 12 Outlet side flow path 11a, 12a flange 13 Cylindrical connecting part 13a: Engaged annular protrusion 14 Valve chamber 20 Extension bonnet 20a Top opening 20b Connection step surface 21 Reduced diameter part 21a Inner surface 22 Bonnet side reduced diameter step surface 23 Edge part 30 stem 31 Reduced diameter part 31a Outer surface 31b Pin hole (locking member mounting portion) 32 Valve body connection part 33 Stem side reduced diameter step surface 40 Valve body 41 Passage 51, 52 Annular ball seat 50 Expanded Space 70 Locking pin (locking member) 71 Rotating bearing 60, 160 Fluid movement adjustment section 61 O-ring 62 Pressure relief groove 161, 162 Annular plate 163 Spring 164 Pressure relief channel 170 Plate locking groove P Gland packing

Claims

1. An extension bonnet type rotary valve comprising: an extension bonnet connected to a valve body; a stem rotatably inserted through the extension bonnet and having a reduced diameter portion at a tip end inserted into the valve body; and a valve body connected to the reduced diameter portion at the tip end of the stem within the valve body and rotating together with the stem, an enlarged space is formed within the extension bonnet between a bonnet-side reduced diameter step surface formed on an inner circumferential surface by a reduced diameter portion through which the reduced diameter portion is inserted at an end of the extension bonnet on the side connected to the valve body, and a stem-side reduced diameter step surface formed by the reduced diameter portion of the stem inserted into the extension bonnet; an expansion space provided with a fluid movement adjustment unit that enables pressure in the extension bonnet to be released to the valve body and that suppresses movement of fluid from the valve body into the extension bonnet.

2. 2. The extension bonnet type rotary valve according to claim 1, wherein the fluid movement adjustment portion comprises an O-ring slidably attached to an outer peripheral surface of the reduced diameter portion of the stem along the axial direction of the stem on the outer peripheral surface of the reduced diameter portion and on an inner peripheral surface of the extension bonnet, and a pressure relief groove formed in a tip portion of the stem along the axial direction from a lower end of the expanded space to an interior of the valve body.

3. the fluid movement adjustment portion includes a pair of annular plates attached to the reduced diameter portion facing each other in the axial direction of the stem, and a spring provided between the pair of annular plates; 2. The extension bonnet type rotary valve according to claim 1, wherein the pair of annular plates are held in a position substantially perpendicular to the stem by the springs exerting resilient forces in opposite directions to each other, so as to block the space between the outer peripheral surface of the reduced diameter portion and the inner peripheral surface of the extension bonnet, and further comprises a pressure relief flow passage which deforms when pressure is applied to communicate with the front and back.

4. 4. The extension bonnet type rotary valve according to claim 1, wherein the expanded space is a space formed by, when assembling the stem to the extension bonnet, inserting the reduced diameter portion at the tip of the stem into the valve chamber of the valve body and then pulling it back into the extension bonnet to be assembled to the extension bonnet.

5. a locking member mounting portion to which a predetermined locking member is attached is provided on the tip side of the reduced diameter portion of the stem, and the locking member attached to this locking member mounting portion is locked to a part of the valve body from the valve body side, thereby preventing the stem from slipping out of the extension bonnet, 2. The extension bonnet type rotary valve according to claim 1, wherein the axial length of the expanded space of the stem is set so that the locking member mounting portion can be positioned within the valve chamber of the valve body with the fluid movement adjustment portion sandwiched between the stem side reduced diameter step surface and the bonnet side reduced diameter step surface.

Images