valve

Abstract

To provide a valve that prevents damage to the valve body due to excessive torque and minimizes losses even in the event of an abnormal situation. [Solution] A valve comprising: a valve body 10 having an inlet passage 14 and an outlet passage 15 through which fluid flows, and a connecting portion 16 connecting these passages; a valve body 19 disposed in the connecting portion and having a fluid passage 20 that can connect the inlet passage and the outlet passage, and which can change the open and closed state of the inlet passage and the outlet passage by rotating on an axis perpendicular to the fluid passage as the axis of rotation; a stem 26 that passes through the valve body and is connected to the valve body and extends in the axial direction; a drive member 40 that rotates the stem; and a joint 30 interposed between the stem and the drive member, wherein the joint 30 breaks when a torque value smaller than the torque value at which the valve body breaks is applied to the axis of rotation.

Description

Technical Field

[0001] This invention relates to a valve that opens and closes by rotating a valve body.

Background Art

[0002] As a valve for controlling a relatively highly viscous fluid such as slurry, there is a ball valve described in Patent Document 1. The ceramic ball valve shown in FIG. 3 is a ball valve for controlling the flow of slurry. The ceramic ball valve 101 includes a valve box 102 having an upstream socket 103 in which an inflow path 110 is formed, a downstream socket 104 in which an outflow path 112 and a valve seat 113 are formed, a valve chamber 109, and a valve seat body 107 in which a valve seat 108 is formed. Inside the valve chamber 109, a ball valve body 105 in which a valve hole 115 for communicating the inflow path 110 and the outflow path 112 when the valve is open is formed is disposed. The lower end of a valve rod 106 that rotates the ball valve body 105 in accordance with the rotation of an actuator 129 is fitted into the upper part of the ball valve body 105 to lock the ball valve body 105.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when slurry is flowed into the ball valve shown in FIG. 3, slurry or the like adheres to the ceramic ball valve body 105, and the torque required for the rotation of the ball valve body 105 increases. Due to this increase in torque, stress is applied to the valve rod 106 and the ball valve body 105 connected to the drive shaft of the actuator 128, and the ball valve body 105, which is mainly the weakest part, is damaged. If the spherical valve body 105 breaks due to this excessive stress, the valve casing 102 will need to be disassembled and the parts replaced, resulting in significant cost and time loss. Furthermore, there is a possibility that the broken fragments could mix into the slurry and flow into external equipment through the outflow passage 112, causing even greater damage.

[0005] This invention has been made in view of the above, and its purpose is to provide a valve that prevents damage to the stem or valve body due to excessive torque, and that minimizes losses even in the event of an abnormal situation. [Means for solving the problem]

[0006] The present invention (1) is a valve comprising: a valve body having an inlet passage and an outlet passage through which a fluid flows, and a connecting portion connecting these passages; a valve body disposed in the connecting portion and having a fluid passage that can connect the inlet passage and the outlet passage, and which can change the open and closed state of the inlet passage and the outlet passage by rotating about an axis of rotation perpendicular to the fluid passage; a stem that passes through the valve body and is connected to the valve body and extends in the axial direction; a drive member for rotating the stem; and a joint interposed between the stem and the drive member, wherein This valve is designed so that the joint breaks when a torque value smaller than the torque value that causes the valve body to break is applied to the rotating shaft.

[0007] The valve of the present invention (1) has a joint disposed between the stem and the drive member, and the joint breaks when a torque value smaller than the torque value that causes the valve body to break is applied to the rotating shaft, so the valve body does not break and only the joint needs to be replaced. In addition, since the valve body does not break, fragments generated when it breaks do not mix into the fluid flowing through the valve.

[0008] The present invention (2) is a valve according to the present invention (1), wherein the joint has a projection that fits into a recess formed at the lower end of the drive shaft of the drive member, and a notch that causes damage is formed in the projection. That is the case.

[0009] In the present invention (2), the joint has a projection that fits into a recess formed at the lower end of the drive shaft of the drive member, and a notch that causes damage is formed in the projection, so that the notch causes failure when a predetermined torque is reached.

[0010] The present invention (3) is a valve according to the present invention (2), wherein the notch is a groove formed on the outer circumference of the protruding portion.

[0011] In the present invention (3), the notch is a groove formed on the outer circumference of the protruding portion, making it easy to process. [Effects of the Invention]

[0012] The present invention provides a valve in which the valve body is prevented from being damaged by excessive torque in a valve with a rotating stem, minimizing losses even in the event of an abnormal situation, and preventing broken fragments from mixing with the fluid flowing through the valve. [Brief explanation of the drawing]

[0013] [Figure 1] This is a partial cross-sectional view of the entire valve according to Embodiment 1 of the present invention. [Figure 2] These are a plan view, a front section cross view, and a bottom view of the valve joint in Example 1. [Figure 3] This is a partial cross-sectional view of the entire ceramic ball valve described in Patent Document 1. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described in detail below with reference to the drawings. The following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses.

[0015] The valve 1 shown in Fig. 1 includes a valve body 10, a valve element 19, a stem 26, a joint 30, and a drive member 40. The valve body 10 has an upstream socket 12 in which an inlet-side passage 14 through which fluid flows is formed, a downstream socket 13 in which an outlet-side passage 15 is formed, and a communication part 16 that communicates between these passages. A valve seat 17 is formed in the upstream socket 12, and a valve seat 18 is formed in the downstream socket 13. A casing 11 is disposed above and below the upstream socket 12 and the downstream socket 13, and the upstream socket 12, the downstream socket 13, and the casing 11 are assembled with bolts 24 and bolts 23. An O-ring 22 is interposed between the upstream socket 12 and the downstream socket 13 to maintain airtightness.

[0016] The valve element 19 is disposed inside the communication part , and the valve shown in Fig. 1 is generally called a ball valve. A fluid passage 20 is formed in the valve element 19. When the valve element 19 rotates, the fluid passage 20 also rotates. When the fluid passage 20, the inlet-side passage 14, and the outlet-side passage 15 are inserted, the valve is in an open state. The state shown in Fig. 1 is a closed state. A valve element recess 21 is formed in the upper part of the valve element 19, and the lower end of the stem 26 is fitted into this recess to lock the valve element 19. An O-ring 25 is interposed around the stem 26 to prevent fluid from leaking upward.

[0017] A stem protrusion 27 is formed at the upper end of the stem 26. A joint 30 is disposed above the stem 26. A joint lower recess 33 is formed on the lower surface of the joint 30, and the stem protrusion 27 is fitted into this joint lower recess 33 to connect the stem 26 and the joint 30.

[0018] A joint protrusion 31 is formed at the upper part of the joint 30, and a notch 32 is formed at the lower part of the joint protrusion 31. A recess 42 is formed at the lower part of the drive shaft 41 of the drive member 40, and the joint protrusion 31 is fitted into this recess 42 to connect the drive shaft 41 and the joint 30. Due to the rotation of the drive shaft 41, torque is applied to the joint 31, the stem 26, and the valve body 19. When rotation is inhibited and excessive torque is generated due to adhesion of slurry or the like to the valve body 19, this notch 32 serves as a starting point for fracture and the joint breaks before the stem 26 or the valve body 19 is broken. When the joint 30 breaks, the joint 30 can be replaced without disassembling the valve body 10, resulting in less cost and time for recovery, and debris generated when the valve body 19 is damaged does not flow into the fluid flow path.

[0019] FIG. 2 is a plan view (FIG. 2(A)), a front partial cross-sectional view (FIG. 2(B)), and a bottom view (FIG. 2(C)) of the joint 30.

[0020] A joint protrusion 31 is formed at the upper part of the joint 30, and a notch 32 is formed at the lower part of the joint protrusion 31. The notch 32 is a groove formed on the outer periphery of the protrusion 31 in FIG. 2, but is not limited thereto, as long as the joint 30 breaks at a smaller torque value than when the valve body 19 is damaged. A joint lower recess 33 is formed at the lower part of the joint 30, and a stem protrusion 27 is fitted into this recess, connecting the stem 26 and the joint 30.

Industrial Applicability

[0021] As described above, the present valve can prevent the stem and the valve body from being damaged by excessive torque, minimize losses even in case of an abnormal situation, and prevent debris at the time of damage from entering the flow path. The present valve is not limited to a ball valve and can be applied to all valves that open and close by rotating a valve body, and can be applied not only to automatic valves whose drive members are air-driven or electric-driven, but also to manual valves.

Explanation of Reference Numerals

[0022] 1; Valve 10; Valve body 11; Casing 12; Upstream socket 13; Downstream socket 14; Inlet-side passage 15;Exit side passage 16;Communication part 17; valve seat 18; valve seat 19; valve body 20;Fluid passage 21; valve body recess 22; O-ring 23; Bolt 24 bolts 25; O-ring 26; Stem 27; Stem protrusion 30; Joint 31; Joint protrusion 32; Notch 33; Lower recess of joint 40; Drive Member 41; drive shaft 42; recess

Claims

1. A valve body having an inlet passage and an outlet passage through which fluid flows, and a connecting section that connects these passages, A valve body is disposed in the aforementioned communication section and has a fluid passage that can connect the inlet passage and the outlet passage, and can change the open / closed state of the inlet passage and the outlet passage by rotating with an axis perpendicular to the fluid passage as its axis of rotation, The valve body is inserted through the stem, which is connected to the valve body and extends in the axial direction, A drive member for rotating the aforementioned stem, A joint interposed between the stem and the drive member, A valve having, A valve in which the joint breaks when a torque value smaller than the torque value that causes the valve body to break is applied to the rotating shaft.

2. The valve according to claim 1, wherein the joint has a projection that fits into a recess formed at the lower end of the drive shaft of the drive member, and a notch that causes damage is formed in the projection.

3. The valve according to claim 2, wherein the notch is a groove formed on the outer circumference of the protruding portion.

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