Preload ball valve

Abstract

The utility model relates to the field of sealing of a valve rod and a valve body of a ball valve, in particular to a preload ball valve which comprises a valve body. The ball body is arranged in the valve body and used for controlling on-off of the interior of the valve body; the valve rod penetrates through the valve body and is clamped with the valve body, and the bottom of the valve rod is inserted into the ball body; the filler is arranged between the valve rod and the valve body and used for blocking a gap between the valve rod and the valve body; the pressing ring is arranged on the valve rod in a sleeving mode, located above the filler and used for pressing the filler; the disc spring is arranged on the valve rod in a sleeving mode, located above the pressing ring and used for providing elastic force; the first nut is in threaded connection with the valve rod, is positioned above the disc spring and is used for fixing the disc spring on the valve rod; the handle is arranged on the valve rod in a sleeving mode, connected with the valve rod in a clamped mode and located above the first nut. Pressure is applied to the disc spring through the first nut, the disc spring forms pre-tightening force, the pressing ring extrudes the packing, the packing forms pre-loading loads, and therefore the sealing effect and sealing performance of the packing between the valve rod and the valve body are improved.

Description

Technical Field

[0001] The utility model relates to the sealing field between the valve stem and the valve body of a ball valve, in particular to a preloaded ball valve. Background Technique

[0002] A ball valve is a valve in which a closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve.

[0003] At present, when a traditional ball valve is in use, there is no preloading load at its packing part, which easily leads to external leakage at the packing part of the ball valve. Moreover, with the extension of the service time and continuous reciprocating opening and closing, the wear of the packing part of the ball valve increases, further increasing the risk of external leakage at the packing part of the ball valve. Summary of the Invention

[0004] In order to improve the sealing performance of the packing part of the ball valve and reduce the risk of external leakage at the packing part of the ball valve, the utility model provides a preloaded ball valve, which applies pressure to the disc spring by using a first nut, and the disc spring forms a pre-tightening force, so that the pressure ring squeezes the packing, enabling the packing to form a preloading load, thereby improving the sealing effect and sealing performance between the packing and the valve stem and the valve body.

[0005] A preloaded ball valve provided by the utility model adopts the following technical scheme:

[0006] A preloaded ball valve includes:

[0007] A valve body;

[0008] A ball, arranged inside the valve body, used to control the on-off inside the valve body;

[0009] A valve stem, passing through the valve body and clamped with the valve body, and its bottom is inserted into the ball, used to drive the ball to rotate;

[0010] Packing, arranged between the valve stem and the valve body, used to seal the gap between the valve stem and the valve body;

[0011] A pressure ring, sleeved on the valve stem, located above the packing, used to compress the packing;

[0012] A disc spring, sleeved on the valve stem, located above the pressure ring, used to provide an elastic force;

[0013] A first nut, threadedly connected to the valve stem, located above the disc spring, used to fix the disc spring on the valve stem; and

[0014] A handle, sleeved on the valve stem and clamped with the valve stem, located above the first nut, used to drive the valve stem to rotate.

[0015] Preferably, a second nut for fixing the handle is threadedly connected to the valve stem, and the second nut is located above the handle.

[0016] Preferably, an annular sealing ring is sleeved on the valve stem, and the annular sealing ring is located inside the valve body. The annular sealing ring is located at the clamping connection between the valve stem and the valve body and is used to seal the gap between the valve stem and the valve body.

[0017] Preferably, the number of the disc springs is two, and the two disc springs are arranged in an opposing manner.

[0018] Preferably, a limit pin is inserted into the valve body. The handle includes a limiting portion and a gripping portion connected to each other. The limiting portion is sleeved on the valve stem, and the top position of the limit pin is higher than the bottom position of the limiting portion. The gripping portion is used for gripping.

[0019] Preferably, a fixing hole is formed in the limiting portion, and a positioning hole is formed in the valve body. A fixing pin is inserted through the fixing hole and the positioning hole.

[0020] In summary, the utility model has the following beneficial technical effects:

[0021] 1. By applying pressure to the disc spring by the first nut, a pre-tightening force is formed by the disc spring, so that the pressing ring extrudes the packing, and the packing forms a preloading load, thereby improving the sealing effect and sealing performance of the packing between the valve stem and the valve body.

[0022] 2. By arranging a limit pin on the valve body to limit the limiting portion on the handle, the problem that the user rotates the handle by too large an angle is avoided, so that the user can better control the opening and closing of the ball valve.

[0023] 3. By arranging a fixing pin between the valve body and the handle for fixation, the ball valve will not be accidentally touched to cause closing or opening during use, and the stability of the ball valve to maintain the same opening degree during use is improved. Description of the Drawings

[0024] Figure 1 is the overall structural schematic diagram of the embodiment of the utility model.

[0025] Figure 2 is Figure 1 the cross-sectional structural schematic diagram in the A-A direction in

[0026] Description of the reference numerals: 11, valve body; 111, positioning hole; 12, sphere; 13, valve stem; 14, packing; 15, pressing ring; 16, disc spring; 17, first nut; 18, handle; 181, limiting portion; 182, gripping portion; 183, fixing hole; 19, second nut; 20, annular sealing ring; 21, limit pin; 22, fixing pin. Detailed Embodiments

[0027] The present utility model will be further described in detail below in conjunction with the accompanying drawings.

[0028] An embodiment of the present utility model discloses a preloaded load ball valve.

[0029] Referring to Figure 1 and Figure 2 , the preloaded load ball valve includes a valve body 11, a ball 12, a valve stem 13, a packing 14, a gland 15, a disc spring 16, a first nut 17, a handle 18, and a second nut 19.

[0030] The ball 12 is arranged inside the valve body 11. By rotation, the ball 12 can control the on-off inside the valve body 11. The valve stem 13 is vertically inserted through the valve body 11, and the valve stem 13 is clamped with the valve body 11. In order to improve the sealing performance at the clamping position between the valve stem 13 and the valve body 11, an annular sealing ring 20 is sleeved on the valve stem 13. The annular sealing ring 20 is located between the valve stem 13 and the valve body 11 and at the clamping position between the valve stem 13 and the valve body 11. The annular sealing ring 20 seals the clamping position between the valve stem 13 and the valve body 11.

[0031] Referring to Figure 1 and Figure 2 , the bottom of the valve body 11 is inserted through or plugged into the ball 12. Specifically, a rectangular hole or a rectangular groove is provided at the top of the ball 12, and the bottom of the valve stem 13 is located in the rectangular hole or the rectangular groove. By rotating the valve stem 13, the bottom of the valve stem 13 can drive the ball 12 to rotate, thereby controlling the on-off of the valve body 11.

[0032] The packing 14 is filled between the valve stem 13 and the valve body 11, and the packing 14 is located above the annular sealing ring 20. The packing 14 is used to block the gap between the valve stem 13 and the valve body 11 and improve the sealing performance between the valve stem 13 and the valve body 11.

[0033] Referring to Figure 1 and Figure 2 , the gland 15 is sleeved on the valve stem 13, and the gland 15 is located above the packing 14. The gland 15 compresses the packing 14.

[0034] The disc spring 16 is sleeved on the valve stem 13, and the disc spring 16 is located above the gland 15. The number of the disc springs 16 is two. The two disc springs 16 are arranged in a butt joint manner on the gland 15, and the two disc springs 16 jointly provide an elastic force.

[0035] Referring to Figure 1 and Figure 2, an external thread is formed on the outer wall of the upper half of the valve stem 13. The first nut 17 is threadedly connected to the external thread of the valve stem 13, and the first nut 17 is located above the two disc springs 16. By screwing the first nut 17, its height on the valve stem 13 is adjusted, so that the two disc springs 16 press the pressure ring 15 and provide a preload.

[0036] The handle 18 is sleeved on the valve stem 13, and the handle 18 is clamped with the upper half of the valve stem 13. The handle 18 is located above the first nut 17. By screwing the handle 18, the valve stem 13 can be driven to rotate.

[0037] The second nut 19 is threadedly connected to the valve stem 13, and the second nut 19 is located above the handle 18. The second nut 19 is used to fix the handle 18 on the valve stem 13 to prevent the handle 18 from coming out of the valve stem 13.

[0038] Further, referring to Figure 1 and Figure 2 , when the user rotates the handle 18, in order to prevent the user from rotating too much, a limit pin 21 is also inserted on the valve body 11. The handle 18 can be divided into a limit part 181 and a grip part 182 which are connected to each other. Among them, the limit part 181 is sleeved on the valve stem 13, and the grip part 182 is located on the side of the limit part 181 away from the valve stem 13. The grip part 182 is used for the user to grip. The top position of the limit pin 21 is higher than the bottom position of the limit part 181. In this way, when the user rotates the handle 18, the limit pin 21 can limit the limit part 181 of the handle 18, avoiding the problem that the user rotates the handle 18 too much.

[0039] At the same time, after the handle 18 rotates in place, in order to prevent the handle 18 from being accidentally touched and opened or closed, a fixing hole 183 is opened on the limit part 181, and a positioning hole 111 is opened on the valve body 11. Among them, a positioning hole 111 can be set every ninety degrees. A fixing pin 22 can be inserted into the fixing hole 183 and the corresponding positioning hole 111. When in use, after the handle 18 rotates in place, the user can insert the fixing pin 22 into the fixing hole 183 and the corresponding positioning hole 111 to fix the handle 18.

[0040] When in use, by screwing the first nut 17, pressure is applied to the disc spring 16, so that the disc spring 16 applies pressure to the packing 14 between the valve stem 13 and the valve body 11, providing a preload for the packing 14, and thus improving the sealing effect and performance between the packing 14 and the valve stem 13 and the valve body 11.

[0041] The above are all the preferred embodiments of the present invention. The protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A preloaded ball valve, characterized in that, Comprising: Valve body; A sphere, disposed within the valve body, for controlling the on-off inside the valve body; A valve stem, passing through the valve body and clamped with the valve body, and the bottom is inserted into the sphere, for driving the sphere to rotate; Packing, disposed between the valve stem and the valve body, for sealing the gap between the valve stem and the valve body; A gland, sleeved on the valve stem, located above the packing, for pressing the packing; A disc spring, sleeved on the valve stem, located above the gland, for providing elastic force; A first nut, threadedly connected to the valve stem, located above the disc spring, for fixing the disc spring on the valve stem; And A handle, sleeved on the valve stem and clamped with the valve stem, located above the first nut, for driving the valve stem to rotate.

2. The preloaded load ball valve according to claim 1, characterized in that, A second nut for the handle is threadedly connected to the valve stem, and the second nut is located above the handle.

3. A preloaded load ball valve according to claim 1, characterized in that, An annular sealing ring is sleeved on the valve stem, and the annular sealing ring is located inside the valve body. The annular sealing ring is located at the clamping position of the valve stem and the valve body and is used for sealing the gap between the valve stem and the valve body.

4. A preloaded load ball valve according to claim 1, characterized in that, The number of the disc springs is two, and the two disc springs are arranged in an opposing manner.

5. A preloaded load ball valve according to claim 1, characterized in that, A limit pin is inserted into the valve body. The handle includes a limit portion and a grip portion connected to each other. The limit portion is sleeved on the valve stem, and the top position of the limit pin is higher than the bottom position of the limit portion. The grip portion is for grasping.

6. The preloaded load ball valve according to claim 5, wherein A fixing hole is formed in the limit portion, and a positioning hole is formed in the valve body. A fixing pin is inserted through the fixing hole and the positioning hole.

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