Valve

Abstract

The purpose of the present invention is to provide a valve capable of facilitating retightening work of a pressing screw member for pressing a gland packing and installation work of a restriction member of the pressing screw member.　The present invention comprises: a valve body 10 having a flow passage; a valve member 31 that is accommodated in the valve body, and opens and closes the flow passage; an actuator 20 that operates the valve member; a stem 30 that connects the valve member and the actuator; a pressing screw member 40 that is screwed to a threaded part 13 of the valve body in a state in which the stem penetrates the pressing screw member, and that presses a gland packing 32 sealing between the valve body and the stem; and a restriction member 50 that restricts rotation of the pressing screw member. The restriction member has a through-hole through which the pressing screw member penetrates. The restriction member comprises: a restriction part 51 that faces a side surface of the pressing screw member and locks turning of the pressing screw member; and a fixed part 53 that is present on the valve body side of the restriction part of the restriction member and is directly or indirectly fixed to the valve body.

Description

valve

[0001] The present invention relates to a valve.

[0002] 7 shows a valve 4 including a valve body 310 having a flow path (inlet passage) 311, a flow path (outlet passage) 312, and a valve seat 314. Such a valve is used as a control valve for controlling the flow of a fluid, or as an on-off valve for turning the flow of a fluid on and off.

[0003] The actuator 320 having a handle 321 is connected to a lower stem 330 having a valve body 331 at its lower end and an upper stem 332, and is provided with a lower bonnet 360 surrounding the lower stem 330 and an upper bonnet 361 surrounding the upper stem 332.

[0004] A gland packing 332 is disposed between the upper stem 332 and the upper bonnet 361 to prevent fluid flowing through the valve body 310 and gas resulting from evaporation of the fluid from leaking to the outside, and a pressure screw member 340 is screwed in to press the gland packing 332 downward so that the gland packing 332 tightly contacts the upper stem 332 and the upper bonnet 361. Furthermore, a restricting member 350 engages the pressure screw member 340 to prevent it from loosening, and the restricting member 350 is fixed to the upper bonnet 361.

[0005] Gland packings are made of fluororesins such as PFA and PTFE. However, when such materials are subjected to continuous load, creep occurs, causing deformation over time and resulting in a deterioration of sealing performance. Therefore, in the valve shown in Figure 7, the pressure screw 340 must be periodically retightened, making periodic inspection and maintenance essential. To retighten the pressure screw 340, the restricting member 350 is removed, the pressure screw 340 is retightened, and then the restricting member 350 is installed. Retightening the pressure screw 340 causes the upper end surface of the pressure screw 340 to drop, so a new restricting member must be installed if necessary.

[0006] The present invention has been made in view of the above points, and its object is to provide a valve that uses a gland packing and that facilitates the retightening of a pressure screw member for pressing the gland packing and the installation of a restricting member for restricting loosening of the pressure screw member.

[0007] The present invention (1) is a valve comprising: a valve body having a flow path; a valve disc housed in the valve body for opening and closing the flow path; an actuator for operating the valve disc; a stem connecting the valve disc to the actuator; a press screw member that is threaded onto a threaded portion of the valve body with the stem passing through and presses a gland packing that seals between the valve body and the stem; and a regulating member for regulating rotation of the press screw member, wherein the regulating member has a regulating portion that faces a side surface of the press screw member and locks the rotation of the press screw member, and a fixing portion that fixes the regulating member directly or indirectly to the valve body on the side of the valve body that is closer to the valve body than the regulating portion.

[0008] In the valve of the present invention (1), the regulating member has a regulating portion that faces the side surface of the press screw member and locks the rotation of the press screw member, and a fixing portion that fixes the regulating member directly or indirectly to the valve body on the side of the regulating portion of the press screw member that is closer to the valve body than the regulating portion, so that rotation of the press screw member is no longer restricted by releasing the fixing portion. The press screw member whose rotation is no longer restricted can be easily retightened, and then the fixing portion can be fixed again, eliminating the need to replace the regulating member and facilitating the retightening of the press screw member and the installation of the regulating member.

[0009] The present invention (2) is the valve of the present invention (1), wherein the valve body includes a bonnet that stands upright from the valve body and houses the stem, the gland packing is interposed between the stem and the bonnet, and the threaded portion is formed on the end of the bonnet on the actuator side.

[0010] The valve of present invention (2) is intended for a valve in which a bonnet is attached to the valve body, and a gland packing is interposed between the stem and the bonnet. A threaded portion that threads onto the press screw member is engraved on the bonnet. Even in this case, as in present invention (1), replacement of the restricting member is not required, and retightening of the press screw member and installation of the restricting member can be facilitated. In present invention (1), it is stated that "the restricting member is provided with a fixing portion that is directly or indirectly fixed to the valve body, located closer to the valve body than the restricting portion" because, as in present invention (2), the restricting member may be fixed to the bonnet and indirectly fixed to the valve body. There are various embodiments other than the bonnet, such as fixing to an actuator and indirectly fixed to the valve body.

[0011] The present invention (3) is the valve of the present invention (1) or (2), wherein the regulating member has a through hole through which the pressure screw member passes, and the regulating portion is formed on the inner surface of the through hole.

[0012] In the present invention (3), the regulating member has a through hole through which the pressure screw member passes, and the regulating portion is formed on the inner surface of the through hole. Therefore, by loosening the fixation of the regulating member, for example, in the case of screw fixation, it is possible to retighten the pressure screw member without removing the screw and completely separating the regulating member from the pressure screw member.

[0013] The present invention (4) is the valve of the present invention (1), wherein the fixing portion has an elongated hole, and a fixing bolt that fixes the valve body and the regulating member passes through the elongated hole and is screwed into a threaded hole formed in the valve body to fix the valve.

[0014] In the present invention (4), the fixing portion has an elongated hole, and the fixing bolt that fixes the valve body and the restricting member passes through the elongated hole and is threaded into a threaded hole formed in the valve body, so that it is possible to retighten the pressure screw member without completely removing the fixing bolt.

[0015] The present invention (5) is the valve of the present invention (2), wherein the fixing portion has an elongated hole, and a fixing bolt that fixes the bonnet and the regulating member passes through the elongated hole and is screwed into a threaded hole formed in the bonnet to fix the valve.

[0016] In the present invention (5), the fixing portion has an elongated hole, and the fixing bolt that fixes the bonnet and the regulating member passes through the elongated hole and is screwed into a threaded hole formed in the bonnet, so that it is possible to retighten the pressure screw member without completely removing the fixing bolt.

[0017] The present invention (6) is the valve of the present invention (1) or (2), wherein the threaded portion is a female threaded portion having a female thread formed therein, and the press screw member is a gland bolt having a male thread formed therein that screws into the female thread.

[0018] In the present invention (6), the threaded portion is a female threaded portion having a female thread formed therein, and the pressing screw member is a gland bolt having a male thread formed therein that screws into the female thread, so that retightening is performed by retightening the head of the gland bolt with a wrench or the like.

[0019] The present invention (7) is the valve of the present invention (1) or (2), wherein the threaded portion is a male threaded portion having a male thread formed therein, and the pressing screw member is a gland nut having a female thread formed therein that screws together with the male thread.

[0020] In the present invention (7), the threaded portion is a male threaded portion having a male thread formed therein, and the pressure screw member is a gland nut having a female thread formed therein that screws together with the male thread, so that retightening is performed by retightening the side of the gland nut with a wrench or the like.

[0021] According to the present invention, it is possible to provide a valve that uses a gland packing and that facilitates the retightening of a pressure screw member that presses the gland packing and the installation of a restricting member that restricts loosening of the pressure screw member.

[0022] FIG. 1 is a partial cross-sectional view of the entire valve of embodiment 1 of the present invention. FIG. 2 is a partial cross-sectional view of the entire valve of embodiment 1 of the present invention, showing a state in which the fixation of the regulating member is released. FIG. 3 is a plan view (A) and a front view (B) of the regulating member used in embodiment 1. FIG. 4 is a view explaining how the regulating member regulates the rotation of the press screw member. FIG. 5 is a partial cross-sectional view of the entire valve of embodiment 2 of the present invention. FIG. 6 is a partial cross-sectional view of the entire valve of embodiment 3 of the present invention. FIG. 7 is a partial cross-sectional view of the entire valve provided with a conventional regulating member.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses.

[0024] 1 is a partial cross-sectional view of an entire valve according to a first embodiment of the present invention, and the valve 1 is mainly composed of a valve body 10, an actuator 20, and a stem 30. The valve body 10 is formed with a flow path (inlet passage) 11, a flow path (outlet passage) 12, and a valve seat 14.

[0025] A valve element 31 is disposed at the tip of a stem 30 attached to an actuator 20, and the operation of the actuator 20 causes the valve to contact and separate from a valve seat 14, controlling the opening and closing of the valve. A threaded portion 13 is formed at the top of the valve body 10, and a press screw member 40 is attached to screw into this threaded portion. The press screw member 40 is a nut called a gland nut.

[0026] A gland packing 32 is disposed between the stem 30 and the valve body 10, and ferrules 33, 34 are attached above and below the gland packing 32. When the press screw member 40 is screwed in, the pressing portion 41 moves downward and presses the ferrule 34, compressing the gland packing 32 and improving the sealing performance of the gland packing 32. The pressing portion 41 may be integral with the press screw member 40 or may be separate.

[0027] The restricting member 50 is disposed so that the pressure screw member 40 passes through it, and the inner wall of the through hole forms the restricting portion 51. The restricting member 50 is fixed to the valve body 10 by threading the fixing bolt 54 of the fixing portion 53 on the valve body 10 side into the threaded hole 15 formed in the valve body 10.

[0028] By loosening the fixing bolt 54 and shifting the restricting member 50 from the press screw, the side of the press screw 40 can be retightened with a wrench or the like. In this case, if a horizontal elongated hole is drilled in the fixing portion 53 through which the fixing bolt 54 passes, the restricting member 50 can be fixed to the valve body 10 even if the press screw 40 rotates and the position of the restricting member 50 changes due to retightening. It is also possible to retighten the press screw 40 and the restricting member 50 as a unit without completely removing the fixing bolt 54.

[0029] The dimension L shown in FIG. ２ (the distance from the lower end of the restricting member 50 to the opposing valve body 10) is dimension L １ If the distance between the top surface of the restricting member 50 and the bottom end of the side surface of the press screw member 40 is greater than the distance between the top surface of the restricting member 50 and the bottom end of the side surface of the press screw member 40, then completely removing the fixing bolt 54 will move the restricting member 50 downward, resulting in the state shown in Fig. 2. In the state shown in Fig. 2, the entire side surface of the press screw member 40 can be retightened with a wrench or the like, making the operation easier.

[0030] FIG. 3A shows a plan view (A) and a front view (B) of the restricting member used in the first embodiment. The restricting member 50 has a restricting portion 51 having a through-hole that passes through the press screw member 40 and a fixed portion 53 that is a cylindrical body that surrounds the valve body. The fixed portion 53 has an elongated hole 55 into which a fixing bolt 54 is inserted. The fixing bolt 54 passes through the elongated hole 55 and threads into a threaded hole formed in the valve body 10, thereby fixing the fixed portion 53 to the valve body 10. The elongated hole 55 allows the restricting member 50 to be fixed to the valve body 10 even if the relative positions of the restricting member 50 and the valve body 10 are changed by retightening. The fixing structure is not limited to this, and for example, a screw hole may be provided in the fixed portion 53 and the valve body may be fixed with a set screw. The shape of the fixed portion is also not limited to this, and it may be a cylindrical body split in half.

[0031] 4 is a diagram illustrating how the regulating member 50 regulates the rotation of the press screw 40. In FIG. 4, the regulating portion 51 has a 24-sided inner wall in a plan view and is formed so that the hexagonal portion of the press screw 40 fits into it. When the press screw 40 is fitted into the regulating portion 51, the regulating member 50 is fixed, thereby restricting the rotation of the press screw 40. Note that while the shape of the regulating portion 51 is shown as a 24-sided inner wall in a plan view in the figure, it may also be a hexagonal inner wall into which the press screw 40 fits directly, or a square inner wall into which two parallel faces of the hexagonal portion fit. Furthermore, the regulating portion 51 does not need to have an inner wall, as long as it has at least a surface that faces one face of the hexagonal portion.

[0032] 5 is a partial cross-sectional view of the entire valve according to the second embodiment of the present invention, and the valve 2 is mainly composed of a valve body 110, an actuator 120, and a stem 130. The valve body 110 is formed with a flow path (inlet passage) 111, a flow path (outlet passage) 112, and a valve seat 114.

[0033] A valve element 131 is disposed at the tip of a stem 130 attached to the actuator 20, and the operation of the actuator 120 causes the valve to contact and separate from the valve seat 114, controlling the opening and closing of the valve. A bonnet 160 is attached to the valve body 110 with a bonnet retaining nut 170. A threaded portion 113 is formed on the top of the bonnet 160, and a press screw member 140 is attached to thread onto this threaded portion 113. The press screw member 140 is a nut called a gland nut.

[0034] A gland packing 132 is disposed between the stem 130 and the bonnet 160, and ferrules 133, 134 are attached above and below the gland packing 132. When the pressure screw member 140 is screwed in, the pressing portion 141 moves downward and presses the ferrule 134, compressing the gland packing 132 and improving the sealing performance of the gland packing 132.

[0035] A regulating member 150 is disposed so that the pressure screw member 140 passes through it, and the inner wall of the through hole forms a regulating portion 151. A fixing portion 153 on the valve body 110 side is screwed into the threaded hole 115 by a fixing bolt 154, whereby the regulating member 150 is fixed to the bonnet 160.

[0036] By loosening the fixing bolt 154 and shifting the restricting member 150 from the press screw 140, the side of the press screw 140 can be retightened with a wrench or the like. In this case, if a horizontal elongated hole is drilled in the fixing portion 153 through which the fixing bolt 154 passes, the restricting member 150 can be fixed to the bonnet 160 even if the press screw 140 rotates due to retightening and the position of the restricting member 150 changes. It is also possible to retighten the press screw 140 and the restricting member 150 as a unit without completely removing the fixing bolt 154.

[0037] FIG. 6 is a partial cross-sectional view of the entire valve of the third embodiment of the present invention. The valve 3 mainly comprises a valve body 210, an actuator 220 having a handle 221, a stem (a lower stem 230 and an upper stem 233), and a bonnet (a lower bonnet 260 and an upper bonnet 261). The valve body 210 is formed with a flow path (inlet passage) 211, a flow path (outlet passage) 212, and a valve seat 214.

[0038] A valve element 231 is disposed at the tip of the lower stem 230, and controls the opening and closing of the valve by contacting and separating from the valve seat 214 through the operation of the actuator 220. A female thread is formed at the top of the upper bonnet 261, and a press screw member 240 is attached to screw into this female thread. The press screw member 240 is a bolt called a gland bolt.

[0039] A gland packing 232 is disposed between the upper stem 233 and the upper bonnet 261, and when the pressure screw member 240 is screwed in, the gland packing 232 is compressed, thereby improving the sealing performance of the gland packing 232.

[0040] A regulating member 250 is disposed so that the pressure screw member 240 passes through it, and the inner wall of the through hole serves as a regulating portion 251. A fixing portion 253 on the valve body 210 side is fixed to the upper bonnet 261 by screwing it into the threaded hole 215 with a fixing bolt 254.

[0041] By loosening the fixing bolt 254 and shifting the restricting member 250 from the press screw 240, the side of the head of the press screw 240 can be retightened with a wrench or the like. At that time, if a horizontal elongated hole is drilled in the fixing portion 253 through which the fixing bolt 254 passes, the restricting member 250 can be fixed to the upper bonnet 261 even if the press screw 240 rotates due to retightening and the position of the restricting member 250 changes. It is also possible to retighten the press screw 240 and the restricting member 250 as a unit without completely removing the fixing bolt 254.

[0042] As described above, the present valve can provide a valve that uses a gland packing and that facilitates the retightening of the pressure screw member that presses the gland packing and the installation of the restricting member that restricts the loosening of the pressure screw member.

[0043] 1, 2, 3 Valve 10, 110 Valve body 11, 111, 211 Flow path (inlet passage) 12, 112, 212 Flow path (outlet passage) 13, 113 Threaded portion 14, 114, 214 Valve seat 15, 115, 215 Threaded hole 20, 120, 220 Actuator 30, 130 Stem 31, 131, 231 Valve body 32, 132, 232 Gland packing 33, 34, 133, 134 Ferrule 40, 140, 240 Pressing screw member 41, 141 Pressing portion 50, 150, 250 Restricting member 51, 151, 251 Restricting portion 53, 153, 253 Fixing portion 54, 154, 254 Fixing bolt 55 Slotted hole 160: Bonnet 170: Bonnet retaining nut 221: Handle 230: Lower stem 233: Upper stem 260: Lower bonnet 261: Upper bonnet

Claims

1. A valve having: a valve body having a flow path; a valve disc housed in the valve body for opening and closing the flow path; an actuator for operating the valve disc; a stem connecting the valve disc to the actuator; a press screw member that is screwed onto a threaded portion of the valve body with the stem passing through and presses a gland packing that seals between the valve body and the stem; and a regulating member that regulates the rotation of the press screw member, wherein the regulating member has a regulating portion that faces a side surface of the press screw member and locks the rotation of the press screw member, and has a fixing portion that directly or indirectly fixes the regulating member to the valve body on the side closer to the valve body than the regulating portion.

2. The valve according to claim 1, wherein the valve body includes a bonnet that extends upright from the valve body and houses the stem, the gland packing is interposed between the stem and the bonnet, and the threaded portion is formed on the end of the bonnet that is closest to the actuator.

3. A valve according to claim 1 or 2, wherein the regulating member has a through hole through which the pressure screw member passes, and the regulating portion is formed on the inner surface of the through hole.

4. A valve as described in claim 1, wherein the fixing portion has an elongated hole, and a fixing bolt that fixes the valve body and the regulating member passes through the elongated hole and is screwed into a threaded hole formed in the valve body, thereby fixing the valve body.

5. The valve according to claim 2, wherein the fixing portion has an elongated hole, and a fixing bolt that fixes the bonnet and the restricting member passes through the elongated hole and is screwed into a threaded hole formed in the bonnet, thereby fixing the valve.

6. A valve as described in claim 1 or 2, wherein the threaded portion is a female threaded portion having a female thread formed therein, and the pressure screw member is a gland bolt having a male thread formed therein that screws into the female threaded portion.

7. A valve as described in claim 1 or 2, wherein the threaded portion is a male threaded portion having a male thread formed thereon, and the pressure screw member is a gland nut having a female thread formed thereon that screws into the male threaded portion.

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