A bellows valve

Abstract

The utility model relates to the field of bellows valve, specifically disclose a bellows valve, including bellows valve main part, bellows valve main part includes: water inlet valve pipe, water outlet valve pipe, valve seat, the inside installation of valve seat has valve rod, the outside of valve rod is located the upper portion of valve seat and is installed open and close mechanism, open and close mechanism includes: limit sleeve, first rapping lever, second rapping lever, the pivot is connected between first rapping lever and second rapping lever, the inside wall of limit sleeve is set up with the position of locating groove, and the position of corresponding locating groove is installed with sliding link in the end of first rapping lever away from second rapping lever. By the first rapping lever and second rapping lever whole from the inside of limit sleeve to the outside pull, the end of second rapping lever will leak in the outside end of limit sleeve, therefore then can pass through the first rapping lever and second rapping lever with pivot and rotate, then the first rapping lever, second rapping and limit sleeve whole length get greater promotion, then the length of force arm of exertion increases, can play the role of saving the strength.

Description

Technical Field

[0001] This utility model relates to the field of bellows valves, specifically a bellows valve. Background Technology

[0002] Bellows valves are used to cut off or connect the medium in a pipeline. Different materials can be selected to suit various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, and urea. Bellows ball valves can be driven manually, by worm gear, pneumatically, or electrically. Bellows ball valves generally use flange connections, but butt welding connections are also possible. Bellows-sealed ball valves achieve stem sealing through the dual action of packing and bellows, achieving zero leakage between the valve and the outside world. Because bellows can only withstand tensile and compressive forces, they are only suitable for valves where the valve stem moves linearly up and down during opening and closing. Therefore, bellows valves are generally limited to gate valves or globe valves.

[0003] However, when the valve body is not opened or closed for a long time, and the threaded section of the valve stem corrodes, it becomes difficult to control the rotation of the valve stem. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a bellows valve, which solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a bellows valve, including a bellows valve body, the bellows valve body including: an inlet valve pipe, an outlet valve pipe, and a valve seat, a valve stem installed inside the valve seat, and an opening and closing mechanism installed on the outer side of the valve stem above the valve seat, the opening and closing mechanism including: a limiting sleeve, a first lever, and a second lever, a rotating shaft connecting the first lever and the second lever, a positioning groove being formed on the inner side wall of the limiting sleeve, and a sliding connecting rod being installed at the end of the first lever away from the second lever corresponding to the positioning groove.

[0006] As a further embodiment of this utility model: a positioning stop is installed on the upper surface of the valve seat, a limit screw is provided on the outer side of the valve stem, and a bellows is installed on the outer side of the valve stem inside the valve seat.

[0007] As a further embodiment of this invention: the length of the first lever is greater than the length of the second lever, and the first lever and the second lever are rotatably connected via the rotating shaft.

[0008] As a further improvement of this utility model: the first lever is slidably connected to the positioning groove via the sliding connecting rod.

[0009] As a further improvement of this utility model, the opening and closing mechanism is fixedly connected to the valve stem.

[0010] As a further improvement of this utility model, the bellows is engaged and fixedly connected to the valve stem.

[0011] As a further improvement of this utility model: the lower end of the valve stem is equipped with a valve core located inside the bellows valve body.

[0012] As a further improvement of this utility model, the positioning stop is fixedly connected to the valve seat.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By pulling the first lever and the second lever together from the inside of the limiting sleeve to the outside, the end of the second lever will protrude from the outside of the limiting sleeve. Therefore, by rotating the first lever and the second lever using a pivot, the overall length of the first lever, the second lever and the limiting sleeve will be greatly increased, thus increasing the length of the lever arm applied, which can save effort.

[0015] 2. When the rotating valve stem rises, the limit screw on the outside of the valve stem will rotate. When it moves to the position that contacts the positioning stop, it can prompt the operator to open the valve to the maximum extent, so as to avoid damage to the outer threads of the valve stem if the rotation continues. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a bellows valve;

[0017] Figure 2 This is a schematic diagram of the opening and closing mechanism in a bellows valve.

[0018] Figure 3 This is an enlarged schematic diagram of the valve seat in a bellows valve;

[0019] Figure 4 This is a cross-sectional view of the main body of a bellows valve.

[0020] Figure 5 This is a side view of the main body of a bellows valve.

[0021] In the diagram: 1. Bellows valve body; 2. Inlet valve pipe; 3. Outlet valve pipe; 4. Valve seat; 5. Valve stem; 6. Opening and closing mechanism; 401. Positioning stop; 501. Limiting screw; 502. Bellows; 601. Limiting sleeve; 602. Positioning groove; 603. First lever; 604. Second lever; 605. Sliding connecting rod; 606. Rotating shaft. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-5 As shown, this embodiment provides a bellows valve, including a bellows valve body 1. The bellows valve body 1 includes: an inlet valve pipe 2, an outlet valve pipe 3, and a valve seat 4. A valve stem 5 is installed inside the valve seat 4. A valve core is installed at the lower end of the valve stem 5 inside the bellows valve body 1. An opening and closing mechanism 6 is installed on the outer side of the valve stem 5 above the valve seat 4. The opening and closing mechanism 6 is fixedly connected to the valve stem 5. The opening and closing mechanism 6 includes: a limiting sleeve 601, a first lever 603, and a second lever 604. The length of the first lever 603 is greater than the length of the second lever 604. A rotating shaft 606 connects the first lever 603 and the second lever 604. The first lever 603 and the second lever 604 are rotatably connected by a rotating shaft 606. The inner wall of the limiting sleeve 601 is provided with a positioning groove 602. The end of the first lever 603 located away from the second lever 604 is equipped with a sliding connecting rod 605 corresponding to the positioning groove 602. The first lever 603 is limited and slidably connected to the positioning groove 602 through the sliding connecting rod 605. A positioning stop 401 is installed on the upper surface of the valve seat 4. The positioning stop 401 is fixedly connected to the valve seat 4. A limiting screw 501 is provided on the outer side of the valve stem 5. A bellows 502 is installed on the outer side of the valve stem 5 inside the valve seat 4. The bellows 502 is engaged and fixedly connected to the valve stem 5.

[0024] The working principle of this utility model is as follows: When in use, the first lever 603 and the second lever 604 are folded and stored inside the limiting sleeve 601. During normal opening and closing, the limiting sleeve 601 can apply torque to control the rotation of the valve stem 5. When opening and closing is difficult, the first lever 603 and the second lever 604 can be pulled outward from inside the limiting sleeve 601. The sliding connecting rod 605 at the end of the first lever 603 will be limited inside the positioning groove 602. When the lever reaches its maximum range, the end of the second lever 604 will protrude from the outer end of the limiting sleeve 601. By rotating the first lever 603 and the second lever 604 using the rotating shaft 606, and controlling the second lever 604 and the first lever 603 to be in the same straight line, the overall length of the first lever 603, the second lever 604 and the limiting sleeve 601 is greatly increased, thus increasing the length of the lever arm applied, which can save effort. At the same time, when the rotating valve stem 5 is rising, the limiting screw 501 on the outside of the valve stem 5 will rotate. When it moves to the position that contacts the positioning stop 401, it can prompt the operator to open to the maximum extent, avoiding damage to the outer threads of the valve stem 5 caused by continued rotation.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bellows valve, comprising a bellows valve body (1), characterized in that, The bellows valve body (1) includes: an inlet valve pipe (2), an outlet valve pipe (3), and a valve seat (4). A valve stem (5) is installed inside the valve seat (4). An opening and closing mechanism (6) is installed on the outside of the valve stem (5) above the valve seat (4). The opening and closing mechanism (6) includes: a limiting sleeve (601), a first lever (603), and a second lever (604). A rotating shaft (606) is connected between the first lever (603) and the second lever (604). A positioning groove (602) is provided on the inner side wall of the limiting sleeve (601). A sliding connecting rod (605) is installed at the end of the first lever (603) that is away from the second lever (604) and corresponds to the positioning groove (602).

2. The bellows valve according to claim 1, characterized in that, A positioning stop bar (401) is installed on the upper surface of the valve seat (4), a limit screw (501) is provided on the outer side of the valve stem (5), and a bellows (502) is installed on the outer side of the valve stem (5) inside the valve seat (4).

3. A bellows valve according to claim 1, characterized in that, The length of the first lever (603) is greater than the length of the second lever (604), and the first lever (603) and the second lever (604) are rotatably connected by the pivot (606).

4. A bellows valve according to claim 1, characterized in that, The first lever (603) is slidably connected to the positioning groove (602) via the sliding link (605).

5. A bellows valve according to claim 1, characterized in that, The opening and closing mechanism (6) is fixedly connected to the valve stem (5).

6. A bellows valve according to claim 2, characterized in that, The bellows (502) is engaged and fixedly connected to the valve stem (5).

7. A bellows valve according to claim 1, characterized in that, The lower end of the valve stem (5) is located inside the bellows valve body (1) and a valve core is installed thereon.

8. A bellows valve according to claim 2, characterized in that, The positioning stop (401) is fixedly connected to the valve seat (4).

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