Yoke diaphragm valve

Abstract

The utility model provides a kind of yoke type diaphragm valve: including valve body, valve cover, diaphragm, valve stem and driving part;Valve body is equipped with flow passage through its both end faces, and valve body is equipped with the valve port being communicated with flow passage;Diaphragm is set on valve port, and the top of diaphragm is connected with membrane head;Valve cover is covered on diaphragm, and is fixedly connected with valve body;Valve cover is equipped with two symmetrical support arms, and the upper end of two support arms is connected with mounting seat, and driving part is connected on mounting seat, and the upper end of valve stem is connected with driving part, and lower end extends into valve cover inner chamber, and is connected with membrane head;Valve stem is connected with indicating plate, and the both ends of indicating plate are vertically up and down slidingly connected with one of support arms;Driving part drives valve stem to vertically move up and down, and it can drive indicating plate to move synchronously, and user can determine the actual opening of valve according to the position of indicating plate;Due to the limitation of support arm, the both ends of indicating plate are always located in the inside of support arm, to avoid being scratched by indicating plate when user operates.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm valve technology, specifically to a yoke-type diaphragm valve. Background Technology

[0002] A diaphragm valve is a shut-off valve in which a flexible diaphragm or a combination diaphragm is installed inside the valve body and valve cover. The diaphragm acts as an opening and closing element to close the flow path, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. In a diaphragm valve, the operating mechanism is isolated from the medium circuit; only the diaphragm and valve body come into contact with the working medium. Both can be made of various different materials. Therefore, diaphragm valves can ideally control a variety of working media, and are especially suitable for media containing chemical corrosive substances or suspended particles. Thus, diaphragm valves not only ensure the purity of the working medium but also prevent the medium in the flow path from impacting the working parts of the operating mechanism. They are characterized by simple structure, good sealing, and good corrosion resistance.

[0003] However, existing civilian diaphragm valves usually do not have external position indicators, so users cannot confirm the actual opening degree of the valve when using it, which can easily lead to incomplete opening or closing. The straight-through diaphragm valves commonly used in nuclear power plants have external indicators installed, but these indicators are not part of the original design. During actual operation, the indicator moves with the operating mechanism, and the indicator exposed on the outside of the diaphragm valve can easily scratch the operator, causing accidents. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a diaphragm valve that can accurately display the actual opening degree of the valve.

[0005] The technical solution of this utility model is to provide a yoke-type diaphragm valve with the following structure: The valve includes a valve body, a valve cover, a diaphragm, a valve stem, and a drive component. The valve body has a flow channel penetrating both ends, and a valve port communicating with the flow channel is provided on the valve body. The diaphragm is disposed on the valve port, and a diaphragm head is connected to the top of the diaphragm. The valve cover is placed on the diaphragm and fixedly connected to the valve body. The valve cover has two symmetrically arranged support arms, the upper ends of which are connected to mounting bases. The drive component is connected to the mounting bases. The upper end of the valve stem is connected to the drive component, and the lower end extends into the inner cavity of the valve cover and is connected to the diaphragm head. The drive component drives the valve stem to move vertically up and down, thereby causing the diaphragm head to extend into or exit the valve port. An indicator plate is connected to the valve stem, and both ends of the indicator plate are vertically and slidably connected to one of the support arms to display the actual opening degree of the valve.

[0006] After adopting the above structure, the yoke diaphragm valve of this utility model has the following advantages compared with the prior art: When the driving component moves the valve stem vertically up and down, it will cause the indicator plate to move synchronously, so that the user can determine the actual opening degree of the valve based on the position of the indicator plate. Due to the limitation of the support arm, both ends of the indicator plate are always located inside the support arm to avoid the user being scratched by the indicator plate during operation.

[0007] Preferably, the inner wall of the support arm is provided with guide ribs extending vertically, and the end of the indicator plate is provided with guide grooves that match the guide ribs. The guide ribs are interlocked in the corresponding guide grooves to limit the circumferential movement of the indicator plate. The cooperation between the guide ribs and the guide grooves can guide the up and down movement of the indicator plate and prevent the indicator plate from being exposed on the outside of the support arm due to circumferential rotation.

[0008] Preferably, the driving component includes a handwheel and a valve stem nut. The valve stem nut is circumferentially rotatably connected to the mounting base and is axially limited by the mounting base. The upper end of the valve stem is threadedly connected to the valve stem nut. The handwheel is connected to the outer peripheral wall of the valve stem nut and is used to drive the valve stem nut to rotate circumferentially, thereby driving the valve stem to move vertically up and down.

[0009] When the handwheel is turned, the valve stem nut will rotate synchronously. The valve stem nut is restricted in the axial direction by the mounting seat. Therefore, the valve stem, which is threaded to it, will move up and down due to the rotation of the valve stem nut, thereby driving the diaphragm head on the diaphragm to move.

[0010] Preferably, the top of the valve stem nut is equipped with a sealing dust cover that can be opened. The sealing dust cover can prevent dust and other contaminants from entering and causing the valve stem nut and valve stem to jam; during maintenance, it can be easily opened to add lubricating grease.

[0011] Preferably, the valve cover has a through hole for the valve stem to extend into its inner cavity. An annular groove is provided on the inner circumferential wall of the through hole, and a sealing ring is installed within the annular groove. The sealing ring is in a tight seal with the outer circumferential wall of the valve stem. This ensures the valve cover remains sealed in the event of diaphragm damage, preventing the medium from leaking out of the valve cover's inner cavity.

[0012] Preferably, the valve cover is provided with a detection hole communicating with its inner cavity, and a leak detection screw is threaded onto the detection hole to open or close the detection hole. During maintenance, the leak detection screw is unscrewed, and whether there is media flowing out of the detection hole can determine whether the diaphragm is damaged and leaking, without having to remove the valve cover, making the operation simple and convenient.

[0013] Preferably, the valve cover has a chain hole located inside the support arm for a chain to pass through to prevent accidental operation. The chain passes through the chain hole and the handwheel in sequence, and is locked by a lock to prevent unauthorized operation of the handwheel. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a half-sectional view of the present invention.

[0016] Figure 3 This is a half-sectional view of the present invention from another viewing direction.

[0017] Explanation of reference numerals in the attached figures: 1. Valve body; 11. Flow channel; 12. Valve port; 2. Valve cover; 21. Support arm; 211. Guide rib; 22. Mounting base; 23. Annular groove; 24. Detection hole; 25. Leak detection screw; 26. Chain lock hole; 3. Diaphragm; 31. Diaphragm head; 32. Thrust pad; 4. Valve stem; 5. Drive component; 51. Handwheel; 52. Valve stem nut; 53. Sealing dust cover; 6. Indicator plate; 61. Guide groove. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the terms "first", "second", etc., are only used to distinguish the names of each component and do not have a primary or secondary relationship. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a yoke diaphragm valve, which includes a valve body 1, a valve cover 2, a diaphragm 3, a valve stem 4, and a drive component 5.

[0021] The valve body 1 has a flow channel 11 that runs through both ends of the valve body 1, and a valve port 12 that communicates with the flow channel 11 is provided on the valve body 1; the diaphragm 3 is provided on the valve port 12, and a membrane head 31 is connected to the top of the diaphragm 3; the valve cover 2 is placed on the diaphragm 3 and is fixedly connected to the valve body 1.

[0022] The valve cover 2 has two symmetrically arranged support arms 21. The upper ends of the two support arms 21 are connected to mounting bases 22. The drive element 5 is connected to the mounting bases 22. The upper end of the valve stem 4 is connected to the drive element 5, and the lower end extends into the inner cavity of the valve cover 2 and is connected to the diaphragm head 31. The drive element 5 is used to drive the valve stem 4 to move vertically up and down, thereby causing the diaphragm head 31 to extend into or retract from the valve port 12. A thrust pad 32 is also provided between the valve stem 4 and the diaphragm head 31 to reduce the impact of the valve stem 4 on the diaphragm head 31 and prevent damage to the diaphragm head 31.

[0023] An indicator plate 6 is connected to the valve stem 4. Both ends of the indicator plate 6 are vertically and slidably connected to one of the support arms 21 to display the actual opening degree of the valve. Specifically, the inner sidewall of the support arm 21 is provided with a guide rib 211 extending in the vertical direction, and the end of the indicator plate 6 is provided with a guide groove 61 that matches the guide rib 211. The guide rib 211 is gapped and engaged in the corresponding guide groove 61 to limit the circumferential movement of the indicator plate 6.

[0024] When the driving component 5 drives the valve stem 4 to move vertically up and down, it will drive the indicator plate 6 to move synchronously. The user can then determine the actual opening degree of the valve based on the position of the indicator plate 6. Since the guide rib 211 on the support arm 21 cooperates with the guide groove 61 on the indicator plate 6, it can guide the up and down movement of the indicator plate 6 and prevent the indicator plate 6 from being exposed on the outside of the support arm 21 due to accidental circumferential rotation. Therefore, both ends of the indicator plate 6 are always located on the inside of the support arm 21, which can prevent the user from being scratched by the indicator plate 6 during operation.

[0025] A scale extending along its height can be installed on the guide rib 211 to allow users to more intuitively observe the actual opening degree of the valve.

[0026] The driving component 5 includes a handwheel 51 and a valve stem nut 52. The valve stem nut 52 is circumferentially rotatably connected to the mounting base 22 and is axially limited by the mounting base 22. The upper end of the valve stem 4 is threadedly connected to the valve stem nut 52. The handwheel 51 is connected to the outer peripheral wall of the valve stem nut 52 and is used to drive the valve stem nut 52 to rotate circumferentially, thereby driving the valve stem 4 to move vertically up and down.

[0027] When the user turns the handwheel 51, it will drive the valve stem nut 52 to rotate synchronously. The valve stem nut 52 is restricted in the axial direction by the mounting seat 22. Therefore, the valve stem 4, which is threaded to it, will move up and down due to the rotation of the valve stem nut 52, thereby driving the diaphragm head 31 on the diaphragm 3 to move.

[0028] The top of the valve stem nut 52 is connected to a sealing dust cover 53, which can be opened to prevent dust and other contaminants from entering and causing the valve stem nut 52 and valve stem 4 to jam. During maintenance, the sealing dust cover 53 can be opened to facilitate the addition of lubricating grease.

[0029] The valve cover 2 is provided with a through hole for the valve stem 4 to extend into its inner cavity. The inner circumferential wall of the through hole is provided with an annular groove 23, and a sealing ring is provided in the annular groove 23. The sealing ring is sealed and fitted with the outer circumferential wall of the valve stem 4. In this way, when the diaphragm 3 is damaged, the valve cover 2 can maintain its sealing performance, and the medium will only flow into the inner cavity of the valve cover 2 and will not overflow from the inner cavity of the valve cover 2.

[0030] The valve cover 2 is provided with a detection hole 24 that communicates with its inner cavity. A leak detection screw 25 is threaded onto the detection hole 24, which can open or close the detection hole 24. A sealing gasket can be fitted onto the leak detection screw 25 to maintain its sealing performance. During maintenance, the leak detection screw 25 can be unscrewed, and the presence of medium flowing out of the detection hole 24 can be used to determine whether the diaphragm 3 is damaged and leaking. There is no need to remove the valve cover 2, making the operation simple and convenient.

[0031] The valve cover 2 has a chain hole 26 located inside the support arm 21 for the anti-misoperation chain to pass through. After adjusting the valve opening, the anti-misoperation chain is passed through the chain hole 26 and the handwheel 51 in sequence and locked by the lock head, which can prevent others from accidentally turning the handwheel 51 and causing changes in the valve opening.

[0032] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A yoke diaphragm valve characterized by: The valve body (1) includes a valve body (1), a valve cover (2), a diaphragm (3), a valve stem (4), and a drive unit (5). The valve body (1) has a flow channel (11) extending through both ends of the valve body, and a valve port (12) communicating with the flow channel (11) is provided on the valve body (1). The diaphragm (3) is positioned on the valve port (12), and a membrane head (31) is connected to the top of the diaphragm (3). The valve cover (2) covers the diaphragm (3) and is fixedly connected to the valve body (1). The valve cover (2) has two symmetrically arranged support arms (21), and the two support arms (21)... The upper end of the valve stem (4) is connected to a mounting base (22), the drive element (5) is connected to the mounting base (22), the upper end of the valve stem (4) is connected to the drive element (5), the lower end extends into the inner cavity of the valve cover (2) and is connected to the diaphragm head (31), the drive element (5) is used to drive the valve stem (4) to move vertically up and down, thereby driving the diaphragm head (31) to extend into or out of the valve port (12); an indicator plate (6) is connected to the valve stem (4), the two ends of the indicator plate (6) are respectively vertically and vertically slidably connected to one of the support arms (21) to display the actual opening degree of the valve.

2. The yoke diaphragm valve of claim 1, wherein: The inner wall of the support arm (21) is provided with a guide rib (211) extending in the vertical direction. The end of the indicator plate (6) is provided with a guide groove (61) that matches the guide rib (211). The guide rib (211) is interlocked in the corresponding guide groove (61) to limit the circumferential position of the indicator plate (6).

3. The yoke diaphragm valve of claim 2, wherein: The driving component (5) includes a handwheel (51) and a valve stem nut (52). The valve stem nut (52) is circumferentially rotatably connected to the mounting base (22) and is axially limited with the mounting base (22). The upper end of the valve stem (4) is threadedly connected to the valve stem nut (52). The handwheel (51) is connected to the outer peripheral wall of the valve stem nut (52) and is used to drive the valve stem nut (52) to rotate circumferentially, thereby driving the valve stem (4) to move vertically up and down.

4. The yoke diaphragm valve according to claim 3, characterized in that: The valve stem nut (52) has a sealing dust cover (53) that can be opened at the top.

5. The yoke diaphragm valve of claim 1, wherein: The valve cover (2) is provided with a through hole for the valve stem (4) to extend into its inner cavity. The inner circumferential wall of the through hole is provided with an annular groove (23). A sealing ring is provided in the annular groove (23). The sealing ring is sealed and fitted to the outer circumferential wall of the valve stem (4).

6. The yoke diaphragm valve of claim 5, wherein: The valve cover (2) is provided with a detection hole (24) communicating with its inner cavity, and a leak detection screw (25) is threaded onto the detection hole (24) to open or close the detection hole (24).

7. The yoke diaphragm valve according to claim 1, characterized in that: The valve cover (2) is provided with a chain hole (26) located inside the support arm (21) for the chain to pass through to prevent misoperation.

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