High-pressure glandless anti-stem-out ball valve

Abstract

The application discloses a glandless high-pressure-resistant anti-stem-flying-out ball valve, which comprises a valve body, a ball body installed in the valve body and a valve stem connected with the ball body; the valve body is of an integrated structure; an elastic limiting component for limiting the valve stem and preventing the valve stem from flying out is installed on the valve body; the elastic limiting component comprises a limiting sleeve, a plurality of limiting blocks movably installed on the limiting sleeve to limit the valve stem and an annular spring sleeved on the limiting blocks and the limiting sleeve, so that the limiting blocks can be expanded outward or shrunk inward by the elasticity of the annular spring; the valve stem is additionally provided with a limiting ring groove matched with the limiting blocks; and the limiting blocks are all provided with limiting bosses matched with the limiting ring groove on the valve stem. The annular spring is sleeved on the limiting blocks and the limiting sleeve, so that the limiting blocks can be expanded outward or shrunk inward by the elasticity of the annular spring, the limiting bosses are inserted into the limiting ring groove to clamp the valve stem, and thus the valve stem is prevented from flying out.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, specifically to a pressure-resistant ball valve without a pressure cap and designed to prevent the valve stem from flying out. Background Technology

[0002] Ball valves are commonly used fluid control components in pipelines. They open and close the flow path by rotating a ball. In existing technologies, traditional valve bodies are of a split design, requiring a valve cover to be installed on the valve body. The valve cover is fixed with fasteners such as bolts, and the valve stem usually relies on the valve cover's restraint to prevent it from flying out. However, this separate valve cover requires additional machining, assembly, and a sealing structure between the valve body and the valve cover, increasing the number of parts and manufacturing costs. Furthermore, under long-term vibration or pressure shock conditions, the bolts may loosen, posing a safety hazard. Therefore, a pressure-resistant, nutless ball valve with anti-stem-flyout design is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing a pressure-resistant ball valve without a pressure cap and to prevent the valve stem from flying out.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pressure-resistant ball valve without a pressure cap to prevent valve stem ejection, comprising a valve body, a ball installed within the valve body, and a valve stem connected to the ball; characterized in that the valve body is an integral structure; an elastic limiting component is installed on the valve body to limit the valve stem and prevent it from ejecting; the elastic limiting component includes a limiting sleeve, several limiting blocks movably installed on the limiting sleeve to limit the valve stem in pairs, and an annular spring fitted on the limiting blocks and the limiting sleeve, allowing the limiting blocks to expand outward or shrink inward due to the elasticity of the annular spring; the valve stem is also provided with a limiting annular groove adapted to the limiting blocks; each limiting block is provided with a limiting boss adapted to the upper limiting annular groove of the valve stem.

[0005] Preferably, the limiting sleeve includes an upper cover plate, a flange fixed on the valve body, and a number of connecting posts disposed between the upper cover plate and the flange.

[0006] Preferably, a sliding groove adapted to the limiting block is provided between the connecting columns to facilitate the installation and sliding of the limiting block.

[0007] Preferably, both ends of the connecting column and the limiting block have mounting grooves that facilitate the installation of the annular spring.

[0008] Preferably, an outer shell is installed between the upper cover plate of the limiting sleeve and the flange; a cavity is provided between the outer shell and the connecting column to facilitate the sliding of the limiting block.

[0009] Preferably, each of the limiting blocks is provided with a limiting boss that matches the upper limit ring groove of the valve stem and an installation groove that facilitates the installation of the annular spring.

[0010] Preferably, both the limiting ring groove and the limiting boss are provided with guide slopes to facilitate the valve stem passing through the elastic limiting sleeve.

[0011] Preferably, the valve stem has a structure with large diameters at both ends and a small diameter in the middle.

[0012] Preferably, a discharge guide cylinder is detachably installed inside the valve body; the discharge guide cylinder is provided with a discharge channel.

[0013] Preferably, both the discharge guide cylinder and the valve body are equipped with valve seats that seal the ball.

[0014] Preferably, packing is also installed between the valve body and the valve stem; a packing pressure plate is also installed on the packing, and the packing pressure plate is fixed between the packing and the elastic limiting sleeve.

[0015] The beneficial effects of this invention are: by directly setting the valve body as an integral structure, the connection surface and potential leakage points between the valve body and the gland are completely eliminated, the structure is more compact, and the pressure bearing capacity is stronger. By fitting a ring spring onto the limiting block and the limiting sleeve, the limiting block can expand outward or shrink inward due to the elasticity of the ring spring. At the same time, the limiting block is inserted into the limiting ring groove of the valve stem to clamp the valve stem, thereby preventing the valve stem from flying out under high pressure conditions and improving the safety of use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is the present invention. Figure 1 A magnified view of a portion of point A in the middle.

[0018] Figure 3 This is a schematic diagram of the valve stem structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the elastic limiting component of the present invention.

[0020] Figure 5 This is a schematic diagram of the limiting sleeve structure of the present invention.

[0021] Figure 6 This is a partial structural schematic diagram of the present invention.

[0022] Figure 7 A schematic diagram of the limiting block of the present invention.

[0023] Legend: 1. Valve body; 2. Ball; 3. Valve stem; 301. Limiting ring groove; 4. Elastic limiting assembly; 401. Limiting sleeve; 402. Limiting block; 403. Ring spring; 404. Connecting column; 405. Sliding groove; 406. Outer shell; 408. Limiting boss; 409. Mounting groove; 410. Guide slope; 411. Top cover plate; 412. Flange; 413. Cavity; 5. Discharge guide cylinder; 501. Discharge channel; 6. Valve seat; 7. Packing; 701. Packing pressure plate. Detailed Implementation

[0024] Below we combine Figures 1-7 The present invention provides a further description of a pressure-resistant, pressure-resistant ball valve with an anti-stem-flyout feature without a pressure cap.

[0025] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0026] See Figures 1-7 As shown, this embodiment of a pressure-resistant ball valve without a pressure cap and designed to prevent the valve stem 3 from flying out includes a valve body 1, a ball 2 installed inside the valve body 1, and a valve stem 3 connected to the ball 2; characterized in that the valve body 1 is an integral structure; an elastic limiting component 4 is installed on the valve body 1 to limit the valve stem 3 and prevent it from flying out; the elastic limiting component 4 includes a limiting sleeve 401, several limiting blocks 402 movably installed on the limiting sleeve 401 to limit the valve stem 3, and a sleeve fitted on the limiting blocks 402. The ring spring 403 on the limiting sleeve 401 allows the limiting block 402 to expand outward or shrink inward due to the elasticity of the ring spring 403; the valve stem 3 is also provided with a limiting ring groove 301 that matches the limiting block 402; each of the limiting blocks 402 is provided with a limiting boss 408 that matches the upper limiting ring groove 301 of the valve stem 3; by directly setting the valve body 1 as an integral structure, the connection surface and potential leakage points between the valve body 1 and the gland are completely eliminated, the structure is more compact and the pressure bearing capacity is stronger; The ring spring 403 is fitted onto the limiting block 402 and the limiting sleeve 401, allowing the limiting block 402 to expand outward or shrink inward due to the elasticity of the ring spring 403. At the same time, the limiting boss 408 on the limiting block 402 is inserted into the limiting ring groove 301 of the valve stem 3 to clamp the valve stem 3, thereby preventing the valve stem 3 from flying out under high pressure conditions and improving the safety of use.

[0027] See Figures 4-7As shown, the limiting sleeve 401 includes an upper cover plate 411, a flange 412 fixed on the valve body 1, and a plurality of connecting posts 404 disposed between the upper cover plate 411 and the flange 412; the upper cover plate 411, the flange 412, and the connecting posts 404 are an integral structure, which is cut and processed by a cutting device; a sliding groove 405 adapted to the limiting block 402 is provided between the connecting posts 404, which facilitates the installation and sliding of the limiting block 402; both ends of the connecting posts 404 and the limiting block 402 have mounting grooves 409 for the installation of the annular spring 403; an outer shell 406 is also installed between the upper cover plate 411 and the flange 412 of the limiting sleeve 401; a cavity 413 is provided between the outer shell 406 and the connecting posts 404 to facilitate the sliding of the limiting block 402; the valve stem 3 adopts a structure with a large diameter at both ends and a small diameter in the middle; the limiting annular groove 301 and the limiting boss 404 Each valve stem 3 is equipped with a guide slope 410 to facilitate the passage of the valve stem through the elastic limiting sleeve 4. The elasticity of the annular spring 403 pushes the limiting block 402 inward, allowing the limiting boss 408 on the limiting block 402 to be directly inserted into the upper limiting annular groove 301 of the valve stem 3, clamping the valve stem 3 circumferentially and preventing it from flying out. Guided by the limiting annular groove 301 and the guide slope 410 on the limiting boss 408, when the valve stem 3 is pushed downward, it can... The valve stem 3 is pushed outward by the large-diameter pressure limiting block 402 at its end, causing the valve stem 3 to be pushed downward and then disassembled through the elastic limiting sleeve 4, thus facilitating the disassembly of the valve stem. When the limiting boss 408 on the limiting block 402 clamps the valve stem 3, the valve stem cannot move upward. The outer shell 406 is fitted onto the outside of the connecting column 404, and both ends are connected to the sleeve body 401 by welding, which protects the connecting column 404 and the limiting block 402.

[0028] See Figure 1 As shown, a discharge guide cylinder 5 is detachably installed inside the valve body 1 via threads; the discharge guide cylinder 5 is provided with a discharge channel 501; both the discharge guide cylinder 5 and the valve body 1 are equipped with valve seats 6 that seal the ball 2; the discharge guide cylinder 5 is detachably installed inside the valve body 1, thereby facilitating the installation of the ball 2.

[0029] See Figure 1 As shown, a packing 7 is also installed between the valve body 1 and the valve stem 3; a packing pressure plate 701 is also installed on the packing 7, and the packing pressure plate 701 is fixed between the packing 7 and the elastic limiting sleeve 4; by installing the packing pressure plate 701 between the packing 7 and the elastic limiting sleeve 4, the installation only requires bolts to lock the elastic limiting sleeve 4 and the valve body 1, without the need to use screws to fix the packing pressure plate 701, thus facilitating the installation of the packing pressure plate 701 and improving the ease of installation.

[0030] In this invention, during valve stem 3 installation, the large-diameter end of the valve stem 3, which connects to the valve core, is directly inserted through the clearance hole 411 of the fixed cover 406 into the through groove 404 formed by the assembly of the limiting block 402. The limiting block 402 expands outward under the pressure of the valve stem 3, opening the annular spring 403 outside the limiting block 402, allowing the large-diameter end of the valve stem 3 to directly pass through the through groove 404 formed by the assembly of the limiting block 402 and extend into the valve body 1 to connect with the valve core via threads. When the small-diameter end of the valve stem is in the through groove 404 formed by the assembly of the limiting block 402, the pressure on the limiting block 402 decreases, and the annular spring 403 pushes the limiting block 402 back to its original position due to its elasticity. This allows the limiting boss 408 on the limiting block 402 to be directly inserted into the limiting annular groove 301 on the valve stem 3, clamping the valve stem 3 and preventing it from flying outward under high pressure. When the valve stem 3 needs to be disassembled from the elastic limiting sleeve 4, simply push the valve stem 3 downwards. Guided by the limiting ring groove 301 and the guide slope 410 on the limiting boss 408, the guide slope 410 on the limiting boss 408 contacts the guide slope 410 on the limiting ring groove 301. As the valve stem 3 moves downwards, the guide slope 410 on the limiting ring groove 301 pushes the limiting boss 408 outwards, allowing the large-diameter end of the valve stem 3 to enter the through groove 404 formed by the limiting block 402. The limiting block 402 expands outwards under the pressure of the valve stem 3, opening the annular spring 403 outside the limiting block 402, allowing the large-diameter end of the valve stem 3 to directly pass through the through groove 404 formed by the limiting block 402, thereby disassembling the valve stem 3 from the elastic limiting sleeve 4. This disassembly method requires that the bolts between the elastic limiting sleeve 4 and the valve body 1 have been removed.

[0031] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A pressure-resistant, pressure-resistant ball valve without a pressure cap, comprising a valve body, a ball installed within the valve body, and a valve stem connected to the ball; characterized in that... The valve body is a one-piece structure; an elastic limiting component is installed on the valve body to limit the valve stem and prevent it from flying out; the elastic limiting component includes a limiting sleeve, several limiting blocks movably mounted on the limiting sleeve to limit the valve stem, and an annular spring fitted on the limiting blocks and the limiting sleeve, allowing the limiting blocks to expand outward or shrink inward due to the elasticity of the annular spring; the valve stem is also provided with a limiting annular groove adapted to the limiting blocks; each limiting block is provided with a limiting boss adapted to the upper limiting annular groove of the valve stem; the limiting sleeve includes an upper cover plate and a flange fixed to the valve body. The system includes a flange and several connecting posts positioned between the upper cover plate and the flange. Sliding grooves adapted to the limiting blocks are provided between the connecting posts to facilitate the installation and sliding of the limiting blocks. Guide slopes are provided on both the limiting ring groove and the limiting boss to facilitate the valve stem passing through the elastic limiting sleeve. An outer shell is also installed between the upper cover plate and the flange of the limiting sleeve. A cavity is provided between the outer shell and the connecting posts to facilitate the sliding of the limiting blocks. The outer shell is fitted over the connecting posts, and both ends are welded to the sleeve body, thus protecting the connecting posts and the limiting blocks.

2. The pressure-resistant, pressure-resistant ball valve with anti-stem ejection feature without a pressure cap as described in claim 1, characterized in that: Both ends of the connecting column and the limiting block have mounting grooves that facilitate the installation of the annular spring.

3. A pressure-resistant ball valve without a pressure cap and designed to prevent valve stem ejection according to claim 1, characterized in that: The valve stem has a structure with large diameters at both ends and a small diameter in the middle.

4. A pressure-resistant ball valve without a pressure cap and designed to prevent valve stem ejection according to claim 1, characterized in that: The valve body is detachably equipped with a discharge guide cylinder; the discharge guide cylinder is provided with a discharge channel.

5. A pressure-resistant, pressure-resistant ball valve with an anti-stem ejection feature without a pressure cap, as described in claim 4, characterized in that: Both the discharge guide cylinder and the valve body are equipped with valve seats that seal the ball.

6. A pressure-resistant, pressure-resistant ball valve with an anti-stem ejection feature without a pressure cap, as described in claim 4, characterized in that: Packing material is also installed between the valve body and the valve stem; a packing pressure plate is also installed on the packing material, and the packing pressure plate is fixed between the packing material and the elastic limiting sleeve.

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