Short-rod gate valve

Abstract

The short-rod gate valve comprises a valve body, a valve rod, a valve cover, a hand wheel and a gate plate, an inlet flow channel and an outlet flow channel are arranged in the valve body, the gate plate is movably arranged in the valve body and used for controlling the inlet flow channel and the outlet flow channel to be communicated and closed, the valve cover is arranged on the valve body through a fastener, and the hand wheel is arranged on the valve cover. The valve rod penetrates through the valve cover, the inner end of the valve rod is connected with the gate plate, the outer end of the valve rod is connected with the hand wheel, the valve rod is movably connected with the gate plate through a thread structure, the valve rod is fixedly connected with the hand wheel, and an axial fixing structure is arranged, so that the valve rod and the valve body are relatively static in the axial direction. The hand wheel and the valve rod are fixed, the axial position of the valve rod is fixed, the valve rod and the gate plate are movably connected through threads, the action functions that the valve rod is relatively static and the gate plate is opened and closed are achieved, and the functions that the length of the valve rod is shortened and the overall space requirement of the valve is reduced are achieved.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a short-stem gate valve. Background Art

[0002] In the field of industrial automation process control, a gate valve is a component that receives a control signal output by a regulating control unit and uses power operation to change the flow or closing state of the medium.

[0003] In the prior art, the gate plate and valve stem of the gate valve are fixedly connected. The gate valve is opened or closed by turning the hand wheel, through the threaded connection between the hand wheel and the valve stem, and the hand wheel is relatively stationary, driving the valve stem and the valve core to move relative to each other. The displacement of the valve stem during the operation is large, and the spatial position requirements of the valve body installation part are large, so there is room for improvement. Summary of the invention

[0004] In view of the above problems, the present application proposes a short-stem gate valve, which fixes the axial position of the valve stem by fixing the hand wheel and the valve stem, and makes the valve stem and the gate plate movably connected by threads, so as to realize the valve stem being relatively still and the gate plate opening and closing action function, thereby achieving the function of shortening the valve stem length and reducing the overall space requirement of the valve; the short-stem gate valve is specifically realized by the following technical solutions:

[0005] A short-stem gate valve comprises: a valve body, a valve stem, a valve cover, a handwheel and a gate plate, wherein an inlet flow channel and an outlet flow channel are arranged in the valve body, the gate plate is movably arranged in the valve body for controlling the conduction and closing of the inlet flow channel and the outlet flow channel, the valve cover is arranged on the valve body by a fastener, the valve stem passes through the valve cover, and the inner end is connected to the gate plate, and the outer end is connected to the handwheel, the valve stem and the gate plate are movably connected by a threaded structure, the valve stem and the handwheel are fixedly connected, and an axial fixing structure is provided to make the valve stem and the valve body relatively stationary in the axial direction.

[0006] It is further configured that the threaded structure includes an externally threaded rod arranged at the inner end of the valve stem, and an internally threaded hole arranged on the gate plate and adapted to the externally threaded rod. When the valve stem rotates, the externally threaded rod and the internally threaded hole form a piston motion. Through this configuration, the axial relative motion between the gate plate and the valve stem is realized, thereby realizing the opening and closing function of the gate plate.

[0007] It is further configured that the externally threaded rod is provided with a first sealing gasket. Through this configuration, the sealing performance of the joint between the valve stem and the gate plate is enhanced, thereby improving the overall sealing performance.

[0008] It is further configured that the axial fixing structure includes a limit plate arranged on the valve stem, a first movable cavity arranged on the valve cover and adapted to the limit plate, and an installation block. The limit plate is circumferentially rotatable in the first movable cavity, the installation block is clamped at the opening of the first movable cavity, and the inner end surface of the installation block is abutted against the limit plate, and the outer end surface of the installation block is tightly abutted against the valve body. Through this configuration, the valve stem is axially limited on the valve body and can rotate axially and be relatively stationary with the valve body.

[0009] It is further configured that an annular limiting flange is provided on the inner surface of the mounting block, and an annular limiting groove is provided on the limiting plate. The annular limiting flange is rotatably arranged in the annular limiting groove. Through this configuration, the installation of the valve stem is facilitated, and it plays a certain guiding role in the circumferential rotation of the valve stem, making the overall structure more stable.

[0010] It is further configured that a first mounting hole is penetrated through the outer end of the valve stem, the handwheel is sleeved on the outer end of the valve stem, a second mounting hole is provided on the handwheel, a screw is provided that penetrates the first mounting hole and the second mounting hole at the same time, and is locked by a nut. Through this configuration, the valve stem is fixedly connected to the handwheel, the valve stem can be driven to rotate by the handwheel, and the overall structure is more stable.

[0011] It is further arranged that a second sealing gasket is arranged between the valve cover and the valve body, and this arrangement enhances the sealing performance.

[0012] It is further arranged that a third sealing gasket and a fourth sealing gasket are arranged at the contact position between the gate and the valve body. Through this arrangement, the sealing performance of the gate when closed is enhanced, thereby improving the overall performance of the valve.

[0013] In summary, the short-stem gate valve fixes the handwheel and the valve stem to fix the axial position of the valve stem, and makes the valve stem and the gate plate movably connected through threads, so as to achieve the function of the valve stem being relatively still and the gate plate opening and closing, thereby shortening the valve stem length and reducing the overall space requirement of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 Front cross-sectional view of the short-stem gate valve provided in the embodiment of the present application Figure 1 ;

[0016] Figure 2 Front cross-sectional view of the short-stem gate valve provided in the embodiment of the present application Figure 2 ;

[0017] Figure 3 Short stem gate valve provided in the embodiment of the present application Figure 1 Enlarged view of part A in the middle;

[0018] Figure 4 Short stem gate valve provided in the embodiment of the present application Figure 1 Enlarged view of middle part B;

[0019] Figure 5 Short stem gate valve provided in the embodiment of the present application Figure 2 Enlarged view of part C in the middle.

[0020] Among them, the reference numerals in the figure are:

[0021] 1. Valve body; 2. Valve stem; 3. Valve cover; 4. Handwheel; 5. Gate; 6. Inlet flow channel; 7. Outlet flow channel; 8. Threaded structure; 9. Axial fixing structure; 10. Externally threaded rod; 11. Internally threaded hole; 12. First sealing gasket; 13. Limiting plate; 14. First movable cavity; 15. Mounting block; 16. Annular limiting flange; 17. Annular limiting groove; 18. First mounting hole; 19. Second mounting hole; 20. Second sealing gasket; 21. Third sealing gasket; 22. Fourth sealing gasket. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] The present application is now further described with reference to the accompanying drawings and specific implementation methods:

[0025] Please also read Figures 1 to 5A short-stem gate valve comprises: a valve body 1, a valve stem 2, a valve cover 3, a hand wheel 4 and a gate plate 5. An inlet flow channel 6 and an outlet flow channel 7 are arranged in the valve body 1. The gate plate 5 is movably arranged in the valve body 1 to control the conduction and closing of the inlet flow channel 6 and the outlet flow channel 7. The valve cover 3 is arranged on the valve body 1 by fasteners. The valve stem 2 passes through the valve cover 3, and the inner end is connected to the gate plate 5, and the outer end is connected to the hand wheel 4. The valve stem 2 is movably connected to the gate plate 5 by a threaded structure 8. The valve stem 2 is fixedly connected to the hand wheel 4, and an axial fixing structure 9 is arranged to make the valve stem 2 and the valve body 1 relatively stationary in the axial direction.

[0026] See also Figures 1 to 5In this embodiment, the threaded structure 8 includes an externally threaded rod 10 arranged at the inner end of the valve stem 2, and an internally threaded hole 11 arranged on the gate plate 5 and adapted to the externally threaded rod 10. When the valve stem 2 rotates, the externally threaded rod 10 and the internally threaded hole 11 form a piston movement. In this way, the externally threaded rod 10 of the valve stem 2 and the internally threaded hole 11 of the gate plate 5 cooperate with each other through threads to realize the opening and closing function of the gate plate 5; the externally threaded rod 10 is provided with a first sealing gasket 12; the axial fixing structure 9 includes a limit plate 13 arranged on the valve stem 2, a stop plate 13 arranged on the valve stem 2, and a stop plate 14 arranged on the valve stem 2. The cover 3 is provided with a first movable cavity 14 adapted to the limit plate 13, and a mounting block 15. The limit plate 13 is circumferentially rotatably arranged in the first movable cavity 14. The mounting block 15 is clamped at the opening of the first movable cavity 14, and the inner end surface of the mounting block 15 is against the limit plate 13, and the outer end surface of the mounting block 15 is tightly against the valve body 1. Through such an arrangement, the valve stem 2, the valve body 1 and the valve cover 3 are axially fixed and stationary, and can also rotate circumferentially. When the valve stem 2 rotates circumferentially, the valve stem 2 drives the gate plate 5 to move. Therefore, the gate plate 5 is movable relative to the valve body 1 and the valve cover 3; the inner surface of the mounting block 15 is provided with an annular limiting flange 16, and the limiting plate 13 is provided with an annular limiting groove 17, and the annular limiting flange 16 is rotatably arranged in the annular limiting groove 17, and the annular limiting flange 16 and the valve stem 2 rotate on the same axis, which plays a role in stabilizing the installation of the valve stem 2 on the one hand, and guides the rotation of the valve stem 2 on the other hand, greatly improving the overall stability performance; the outer end of the valve stem 2 is penetrated by a first mounting hole 18, and the hand wheel 4 is sleeved on the At the outer end of the valve stem 2, a second mounting hole 19 is provided on the handwheel 4, and a screw is provided to penetrate the first mounting hole 18 and the second mounting hole 19 at the same time, and is locked by a nut. In this way, the valve stem 2 and the handwheel 4 are fixed, and the valve stem 2 is rotated to rotate, and the rotation of the valve stem 2 drives the gate plate 5 to move up and down through the thread; a second sealing gasket 20 is provided between the valve cover 3 and the valve body 1; a third sealing gasket 21 and a fourth sealing gasket 22 are provided at the contact position between the gate plate 5 and the valve body 1. The provision of multiple sealing rings is beneficial to improving the overall sealing performance of the valve.

[0027] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A short-stem gate valve, comprising: A valve body (1), a valve stem (2), a valve cover (3), a hand wheel (4) and a gate plate (5), wherein the valve body (1) is provided with an inlet flow channel (6) and an outlet flow channel (7), the gate plate (5) is movably arranged in the valve body (1) for controlling the conduction and closing of the inlet flow channel (6) and the outlet flow channel (7), the valve cover (3) is arranged on the valve body (1) by means of a fastener, the valve stem (2) passes through the valve cover (3), and the inner end is connected to the gate plate (5), and the outer end is connected to the hand wheel (4), and is characterized in that: the valve stem (2) and the gate plate (5) are movably connected by means of a threaded structure (8), and the valve stem (2) and the hand wheel (4) are fixedly connected, An axial fixing structure (9) is also provided to keep the valve stem (2) and the valve body (1) relatively stationary in the axial direction; the axial fixing structure (9) comprises a limit plate (13) provided on the valve stem (2), a first movable cavity (14) provided on the valve cover (3) and adapted to the limit plate (13), and a mounting block (15); the limit plate (13) is circumferentially rotatably provided in the first movable cavity (14); the mounting block (15) is clamped at the opening of the first movable cavity (14); the inner end surface of the mounting block (15) abuts against the limit plate (13); and the outer end surface of the mounting block (15) abuts against the valve body (1).

2. A short-stem gate valve according to claim 1, characterized in that The threaded structure (8) comprises an externally threaded rod (10) arranged at the inner end of the valve stem (2), and an internally threaded hole (11) arranged on the gate plate (5) and adapted to the externally threaded rod (10); when the valve stem (2) rotates, the externally threaded rod (10) and the internally threaded hole (11) form a piston motion.

3. A short-stem gate valve according to claim 2, characterized in that The externally threaded rod (10) is provided with a first sealing gasket (12).

4. A short-stem gate valve according to claim 1, characterized in that The inner surface of the mounting block (15) is provided with an annular limiting flange (16), and the limiting plate (13) is provided with an annular limiting groove (17), and the annular limiting flange (16) is rotatably arranged in the annular limiting groove (17).

5. A short-stem gate valve according to claim 1, characterized in that The outer end of the valve stem (2) is penetrated by a first mounting hole (18), the hand wheel (4) is sleeved on the outer end of the valve stem (2), a second mounting hole (19) is provided on the hand wheel (4), a screw is provided which penetrates both the first mounting hole (18) and the second mounting hole (19) and is locked by a nut.

6. A short-stem gate valve according to claim 1, characterized in that A second sealing gasket (20) is provided between the valve cover (3) and the valve body (1).

7. A short-stem gate valve according to claim 1, characterized in that A third sealing gasket (21) and a fourth sealing gasket (22) are provided at the contact position between the gate plate (5) and the valve body (1).

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