Throttle valve with valve rod only lifting but not rotating

Abstract

The throttle valve comprises the valve rod, a support, a guide pin, a gland, a valve rod nut, a hand wheel and a valve deck, the support is fixedly connected to the upper end of the valve deck through a bolt, the valve rod nut is movably connected to the interior of the upper end of the support, and the gland is connected to the top of the support through threads. A valve rod is installed in the valve cover, the support and the valve rod nut, the valve rod is connected with the valve rod nut through threads, and a hand wheel is fixedly connected to the outer portion of the valve rod nut. The novel structure is adopted, the hand wheel is operated to drive the valve rod nut, the valve is opened and closed through transmission of the valve rod thread, the valve rod only lifts and does not rotate, the valve rod and filler only bear friction in the vertical direction in the opening and closing process of the valve, circumferential friction force does not exist, abrasion of the filler is reduced, meanwhile, torque is small in the opening and closing process, and the valve is not damaged. The valve is simple and reasonable in structure, low in manufacturing cost and suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to a throttle valve, in particular to a throttle valve with a valve stem that can only be lifted and lowered but not rotated. Background Art

[0002] As a kind of control valve, throttle valve is widely used in practice, and is widely used in petroleum, natural gas, chemical, oil refining and other industries. However, the stem of traditional throttle valve can both rotate and rise and fall. This structure will cause rapid wear of the stem and packing during the switching process, especially under certain special working conditions such as high pressure and corrosive media, which will have a greater impact and reduce the service life of the valve. Therefore, we propose a throttle valve with a stem that can only rise and fall but not rotate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a throttle valve in which the valve stem can only be raised and lowered but not rotated, thereby solving the problem that the valve stem of a traditional throttle valve can both rotate and rise and fall. This structure causes the valve stem and packing to wear faster during the switching process, which has a greater impact under certain special working conditions such as high pressure and corrosive media, thereby reducing the service life of the valve.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a throttle valve with a valve stem that can only be raised and lowered but not rotated, comprising a valve stem, a bracket, a guide pin, a pressure cover, a valve stem nut, a handwheel and a valve cover, the upper end of the valve cover is fixedly connected to the bracket by bolts, the upper end of the bracket is movably connected to the valve stem nut, the top of the bracket is connected to the pressure cover by threads, the valve stem is installed in the valve cover, the bracket and the valve stem nut, the valve stem is connected to the valve stem nut by threads, the handwheel is fixedly connected to the outside of the valve stem nut, and one side of the bracket is connected to the guide pin by threads.

[0005] Based on the above solution, a guide groove is provided on the outer wall of the valve stem, and the inner end of the guide pin is located in the guide groove and slidably cooperates with the guide groove.

[0006] Based on the above solution, the valve stem nut is rotationally matched with the bracket, and the valve stem nut is rotationally matched with the gland.

[0007] Based on the above solution, the outer portion of the guide pin is fixedly connected to the bracket by spot welding.

[0008] Based on the above solution, a locking bolt is threadedly connected to one side of the outer wall of the bracket, and the inner end of the locking bolt is tightened on the valve stem nut.

[0009] Compared with the prior art, the present invention has the following beneficial effects: a throttle valve with a valve stem that only rises and falls but does not rotate, adopts a new structure, an operating hand wheel drives the valve stem nut, and the valve is opened and closed through the valve stem thread transmission, the valve stem only rises and falls but does not rotate, and the valve stem and packing only bear friction in the up and down directions during the valve switching process, and there is no circumferential friction, thereby reducing the wear of the packing, and at the same time, the torque during the switching process is relatively small, which greatly improves the service life of the valve. The present invention has a simple and reasonable structure, a low manufacturing cost, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a structural schematic diagram of a throttle valve in which the valve stem can only be raised and lowered but not rotated.

[0011] The numbers in the figure are: 1-valve stem, 101-guide groove, 2-bracket, 3-guide pin, 4-pressure cover, 5-valve stem nut, 6-handwheel, 7-valve cover, 8-locking bolt. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention 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 invention and are not intended to limit the present invention.

[0013] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0014] Reference Figure 1 It can be seen that a throttle valve with a valve stem that only rises and falls but does not rotate comprises a valve stem 1, a bracket 2, a guide pin 3, a pressure cover 4, a valve stem nut 5, a handwheel 6 and a valve cover 7, wherein the upper end of the valve cover 7 is fixedly connected to the bracket 2 by bolts, the upper end of the bracket 2 is movably connected to the valve stem nut 5, the top of the bracket 2 is connected to the pressure cover 4 by threads, the valve stem 1 is installed in the valve cover 7, the bracket 2 and the valve stem nut 5, the valve stem 1 is connected to the valve stem nut 5 by threads, the valve stem nut 5 is fixedly connected to the outside of the handwheel 6, the guide pin 3 is connected to one side of the bracket 2 by threads, the guide pin 3 cooperates with the guide groove 101, and can prevent the valve stem 1 from rotating when the valve stem 1 moves up and down.

[0015] A guide groove 101 is provided on the outer wall of the valve stem 1, and the inner end of the guide pin 3 is located in the guide groove 101 and slidably cooperates with the guide groove 101. The guide pin 3 cooperates with the guide groove 101, and can allow the valve stem 1 to move up and down without rotating; the valve stem nut 5 is rotationally cooperated with the bracket 2, and the valve stem nut 5 is rotationally cooperated with the pressure cover 4, and the pressure cover 4 can axially position the valve stem nut 5, and the valve stem nut 5 can only rotate but cannot move up and down in the bracket 2; the outer part of the guide pin 3 is fixedly connected to the bracket 2 by spot welding, and after the inner end of the guide pin 3 enters the guide groove 101 to a suitable position, it is fixed by spot welding to prevent it from loosening and escaping from the guide groove 101; a locking bolt 8 is threadedly connected to one side of the outer wall of the bracket 2, and the inner end of the locking bolt 8 is tightened on the valve stem nut 5. After adjusting the valve stem 1 to the target position by operating the hand wheel 6, the locking bolt 8 is tightened to lock the valve stem nut 5 to prevent the hand wheel 6 from rotating.

[0016] The principle and advantages of the present invention are as follows: a throttle valve with a valve stem that can only be raised and lowered but not rotated, wherein the local connection structure of the valve stem 1 of the throttle valve is improved, the valve stem 1 is installed in the valve, the bracket 2 is put in from the top of the valve stem 1, and then the guide pin 3 is screwed into the guide groove 101 on the valve stem 1 from the threaded hole on the outer wall of the bracket 2, and then the valve stem nut 5 is screwed into the bracket 2 from the top of the valve stem 1 through threaded cooperation, and then the gland 4 is screwed in to axially position the valve stem nut 5, and then the hand wheel 6 is fixedly sleeved on the outside of the valve stem nut 5, and the valve is checked by operating the hand wheel 6 to see whether it is opened smoothly After the switch has been run-in several times, the contact surface of the guide pin 3 and the bracket 2 is finally spot-welded to prevent the guide pin 3 thread from loosening, and the hand wheel 6 is turned to drive the valve stem nut 5. The valve stem 1 is moved up and down through the threaded transmission on the valve stem 1. The valve is opened and closed, and the valve stem 1 is only lifted and not rotated. During the switching process of the valve, the valve stem 1 and the packing only bear friction in the up and down directions, and there will be no circumferential friction, which reduces the wear of the packing. At the same time, the torque during the switching process is also relatively small, which greatly improves the service life of the valve. The present invention has a simple and reasonable structure, low manufacturing cost, and is suitable for popularization and use.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A throttle valve with a valve stem that can only be raised and lowered but not rotated, comprising a valve stem (1), a bracket (2), a guide pin (3), a gland (4), a valve stem nut (5), a hand wheel (6) and a valve cover (7), characterized in that: The upper end of the valve cover (7) is fixedly connected to a bracket (2) by bolts, the upper end of the bracket (2) is movably connected to a valve stem nut (5), the top of the bracket (2) is connected to a pressure cap (4) by threads, a valve stem (1) is installed inside the valve cover (7), the bracket (2) and the valve stem nut (5), the valve stem (1) is connected to the valve stem nut (5) by threads, the valve stem nut (5) is fixedly connected to a hand wheel (6) on the outside, and one side of the bracket (2) is connected to a guide pin (3) by threads.

2. A throttle valve with a valve stem that only moves up and down but does not rotate according to claim 1, characterized in that: A guide groove (101) is provided on the outer wall of the valve stem (1), and the inner end of the guide pin (3) is located in the guide groove (101) and is slidably matched with the guide groove (101).

3. A throttle valve with a valve stem that only moves up and down but does not rotate according to claim 1, characterized in that: The valve stem nut (5) is rotationally matched with the bracket (2), and the valve stem nut (5) is rotationally matched with the gland (4).

4. A throttle valve with a valve stem that only moves up and down but does not rotate according to claim 1, characterized in that: The outside of the guide pin (3) is fixedly connected to the bracket (2) by spot welding.

5. A throttle valve with a valve stem that only moves up and down but does not rotate according to claim 1, characterized in that: A locking bolt (8) is threadedly connected to one side of the outer wall of the bracket (2), and the inner end of the locking bolt (8) is tightened on the valve stem nut (5).

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