Stop valve with stable pressure relief function

Abstract

According to the technical scheme, the stop valve with the stable pressure relief function is characterized by comprising a valve body, a valve clack located in the valve body and a valve rod driving the valve clack to move, the valve clack comprises a connecting cylinder and a sealing clack which are different in diameter and are coaxially arranged, a main pressure relief hole communicated with an inner cavity of the connecting cylinder is formed in the center of the sealing clack, and the main pressure relief hole is communicated with the inner cavity of the connecting cylinder. A plurality of secondary pressure relief holes which are circumferentially distributed around the axis of the connecting cylinder and communicate with an inner cavity of the connecting cylinder are formed in the cylinder wall of the connecting cylinder, and one end of the valve rod is limited in the connecting cylinder; the filter assembly comprises an upper ring body arranged outside the connecting cylinder in a sleeving mode, a lower ring body located below the upper ring body, a plurality of vertical rods staggered with the secondary pressure relief holes and connecting the upper ring body and the lower ring body, and a filter screen covering the secondary pressure relief holes, and media are filtered through the filter screen so that impurities cannot reach the secondary pressure relief holes. The problem that in the prior art, a pressure relief hole is prone to being blocked, and drainage is affected is solved.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and more specifically to a gate valve with a stable pressure relief function. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal. For example... Figure 1 As shown, existing gate valves include a T-shaped valve disc and a valve stem that moves the valve disc up and down. The flow direction of the medium relative to the valve disc is from top to bottom. During the opening process, due to the downward pressure and gravity of the medium on the valve disc, the valve stem requires a large driving force, making it difficult to open the valve disc and the valve stem is prone to breakage due to prolonged use. Existing technology sets a pressure relief hole on the valve disc and allows the valve stem to move a certain distance relative to the valve disc. By separating the valve stem from the pressure relief hole, the medium can flow into the lower part of the valve disc through the pressure relief hole, thereby reducing the pressure of the medium on the valve disc, facilitating the opening of the valve disc and extending the service life of the valve stem. However, there are still defects. During the opening or closing process, the medium will flow towards the pressure relief hole. This will aggravate the accumulation of impurities in the medium along the flow direction towards the pressure relief hole, causing the pressure relief hole to be blocked and lose its pressure relief function, or impurities will accumulate in the inner cavity of the valve disc and obstruct the valve stem, causing the valve stem to be unable to fully block the pressure relief hole, resulting in leakage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shut-off valve with stable pressure relief function and leakage prevention.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a shut-off valve with a stable pressure relief function, comprising a valve body, a valve disc located within the valve body, and a valve stem that drives the valve disc to move. The valve disc includes a connecting cylinder and a sealing disc with different diameters arranged coaxially. A main pressure relief hole communicating with the inner cavity of the connecting cylinder is provided at the center of the sealing disc. Multiple secondary pressure relief holes are provided on the cylinder wall of the connecting cylinder, which are circumferentially distributed around the axis of the connecting cylinder and communicate with the inner cavity of the connecting cylinder. One end of the valve stem is limited to the connecting cylinder. The valve also includes a filter assembly that blocks the secondary pressure relief holes. The filter assembly includes an upper ring body sleeved outside the connecting cylinder, a lower ring body located below the upper ring body, multiple uprights that are misaligned with the secondary pressure relief holes and connect the upper and lower ring bodies, and a filter screen that blocks the secondary pressure relief holes. The filter screen filters the medium so that impurities cannot reach the secondary pressure relief holes.

[0005] As a further improvement of this utility model, the outer wall of the lower ring body is provided with a plurality of lugs, each of which can be positioned on the sealing flap by bolts.

[0006] As a further improvement of this utility model, the upper surface of the sealing flap is inclined downward relative to the horizontal surface, and the height of the edge of the upper surface of the sealing flap is at its lowest.

[0007] As a further improvement of this utility model, a sealing ring for fitting with the outer wall of the connecting cylinder is provided on the inner wall of the upper ring.

[0008] The beneficial effects of this utility model are as follows: By sleeved the filter assembly outside the connecting cylinder, the filter screen can filter the medium and prevent impurities from reaching the secondary pressure relief hole. Compared with the prior art, this design not only makes up for the defect of large particles clogging the secondary pressure relief hole, but also makes up for the defect of small particles accumulating in the connecting cylinder and preventing the valve stem end from tightly fitting with the main pressure relief hole opening, thus ensuring the normal use of the pressure relief function and the sealing stability between the valve stem and the valve disc; the design of making the filter assembly into a ring shape as a whole, compared with the design of setting the filter screen at each secondary pressure relief hole, not only simplifies the disassembly and assembly steps of the filter screen, but also delays the time when the filter screen is completely clogged, thereby extending the maintenance cycle of the filter screen; the design of installing the filter assembly on the valve disc, compared with the design of installing the filter screen in the valve body flow channel, can achieve the purpose of online maintenance without removing the valve body from the pipeline, simplifying the maintenance steps. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the existing technology;

[0010] Figure 2 This is a schematic diagram of the structure of this utility model;

[0011] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0012] Figure 4 This is an assembly drawing of the valve stem, valve disc, and filter assembly in this utility model;

[0013] Figure 5 for Figure 4 A diagram showing the state of the filter component when it is not properly installed.

[0014] Figure 6 This is a perspective view of the filter assembly in this utility model;

[0015] Figure 7 for Figure 6 Exploded view.

[0016] Reference numerals: 1. Valve body; 2. Valve disc; 21. Connecting cylinder; 22. Sealing disc; 23. Main pressure relief hole; 24. Secondary pressure relief hole; 3. Valve stem; 4. Filter assembly; 41. Upper ring; 42. Lower ring; 43. Vertical rod; 44. Filter screen; 45. Lug; 5. Sealing ring. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0018] Reference Figures 1 to 7 As shown, a shut-off valve with a stable pressure relief function in this embodiment includes a valve body 1, a valve disc 2 located inside the valve body 1, and a valve stem 3 that drives the valve disc 2 to move. The valve disc 2 includes a connecting cylinder 21 with different diameters and coaxially arranged and a sealing disc 22. A main pressure relief hole 23 communicating with the inner cavity of the connecting cylinder 21 is provided at the center of the sealing disc 22. A plurality of secondary pressure relief holes 24 are provided on the cylinder wall of the connecting cylinder 21 in a circular arrangement around the axis of the connecting cylinder 21 and communicating with the inner cavity of the connecting cylinder 21. One end of the valve stem 3 is limited to the connecting cylinder 21 and can move a certain distance relative to it. The end of the valve stem 3 located inside the connecting cylinder 21 can block the communication between the main pressure relief hole 23 and the inner cavity of the connecting cylinder 21.

[0019] Based on the aforementioned prior art, the system also includes a filter assembly 4 that shields the secondary pressure relief hole 24. The filter assembly 4 includes an upper ring body 41, a lower ring body 42, uprights 43, and a filter screen 44. The inner diameters of the upper ring body 41 and the lower ring body 42 match the outer diameter of the connecting cylinder 21. The lower ring body 42 has multiple lugs 45 integrally formed on its peripheral wall, each with a through hole. The lugs 45 are evenly distributed around the axis of the lower ring body 42. The sealing flap 22 has multiple threaded holes that correspond to the lugs 45 respectively. The uprights 43 are multiple and extend around the circumference of the lower ring body 42. The filter elements 43 are evenly distributed in direction. Each element is integrally formed with the lower ring 42 and perpendicular to its upper surface. Annular grooves for inserting the filter screen 44 are machined into both the upper and lower rings using a turning process. Each element is cut into two parts, one inside and one outside the annular groove. The filter screen 44 is made of a rigid material and is ring-shaped. During the assembly of the filter assembly 4, the filter screen 44 is aligned with the annular groove and moved from top to bottom relative to the lower ring 42. The filter screen 44 is first inserted into the cut elements 43. Then, the lower edge of the filter screen 44 is inserted into the annular groove of the lower ring body 42 until the lower edge of the filter screen 44 touches the bottom of the annular groove, and the height of the upper edge of the filter screen 44 is higher than the height of the top of the upright 43. Next, the annular groove of the upper ring body 41 is fitted over the upper edge of the filter screen 44 until the upper ring body 41 touches the top of the upright 43. Finally, the top of the upright 43 is welded to the upper ring body 41, and the filter assembly 4 is assembled in place. The filter assembly 4 is then fitted over the connecting cylinder 21 until the lower ring body 42 touches the upper surface of the sealing flap 22 and the multiple lugs are aligned. The through holes are coaxially connected to multiple threaded holes. The filter assembly 4 is positioned on the valve disc 2 by using bolts to pass through the lug 45 and screw into the sealing flap 22. The secondary pressure relief hole 24 is located on the outer wall of the connecting cylinder 21 at a height between the upper ring body 41 and the lower ring body 42. Multiple uprights 43 are misaligned with multiple secondary pressure relief holes 24, and the filter screen 44 blocks the opening of the secondary pressure relief hole 24. When the end of the valve stem 3 separates from the opening of the main pressure relief hole 23, the medium is filtered by the filter screen 44 and flows through multiple secondary pressure relief holes 24, the connecting cylinder 21 and the main pressure relief hole 23 in sequence.

[0020] Compared to existing technologies, this design not only overcomes the defect of large particles clogging the secondary pressure relief hole 24, but also overcomes the defect of small particles accumulating in the connecting cylinder 21 and preventing the valve stem 3 end from tightly fitting the main pressure relief hole 23 opening, ensuring the normal use of the pressure relief function and the sealing stability between the valve stem 3 and the valve disc 2. The design of making the filter assembly 4 into a ring shape as a whole, compared to the design of setting the filter screen 44 at each secondary pressure relief hole 24, not only simplifies the disassembly and assembly steps of the filter screen 44, but also delays the time when the filter screen 44 is completely clogged, thereby extending the maintenance cycle of the filter screen 44. The design of installing the filter assembly 4 on the valve disc 3, compared to the design of installing the filter screen 44 in the flow channel of the valve body 1, can achieve the purpose of online maintenance without removing the valve body 1 from the pipeline, simplifying the maintenance steps.

[0021] As one specific implementation method of the improvement, refer to Figure 2 and Figure 3 As shown, the upper surface of the sealing flap 22 is machined to form a frustum side centered on the axis of the sealing flap 22. The edge of the upper surface of the sealing flap 22 is at its lowest position. Compared with the design where the upper surface of the sealing flap 22 is a horizontal plane, this design can guide impurities to move towards the edge of the sealing flap 22, avoid impurities accumulating on the sealing flap 22 and overflowing the lower ring 42 and accelerating the clogging of the filter screen 44, and indirectly extend the service life of the filter screen 44.

[0022] As one specific implementation of the improvement, a machining error in the inner diameter of the upper ring 41 causes a gap between the outer wall of the connecting cylinder 21 and the upper ring 41, allowing impurities to pass through. This affects the sealing performance between the end of the valve stem 3 and the main pressure relief hole 23. To solve the aforementioned problem, refer to... Figure 3 , Figure 6 and Figure 7 As shown, a sealing ring 5 can be installed on the inner wall of the upper ring 41 by snap-fit ​​or adhesive. The sealing ring 5 is made of a soft material, such as rubber. When the upper ring 41 is fitted over the connecting cylinder 21, the sealing ring 5 fits against the outer wall of the connecting cylinder 21. This design can ensure the sealing between the upper ring 41 and the connecting cylinder 21. The design of the sealing ring 5 using a soft material can reduce the impact between the upper ring 41 and the connecting cylinder 21 during disassembly and assembly, thereby improving the smoothness of disassembly and assembly.

[0023] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A shut-off valve with a stable pressure relief function, comprising a valve body (1), a valve disc (2) located within the valve body (1), and a valve stem (3) for moving the valve disc (2), wherein the valve disc (2) comprises a connecting cylinder (21) of different diameters and coaxially arranged and a sealing disc (22), wherein a main pressure relief hole (23) communicating with the inner cavity of the connecting cylinder (21) is provided at the center of the sealing disc (22), and a plurality of secondary pressure relief holes (24) circumferentially distributed around the axis of the connecting cylinder (21) and communicating with the inner cavity of the connecting cylinder (21) are provided on the cylinder wall of the connecting cylinder (21), wherein one end of the valve stem (3) is limited to the connecting cylinder (21), characterized in that: It also includes a filter assembly (4) that covers the secondary pressure relief hole (24). The filter assembly (4) includes an upper ring body (41) sleeved on the connecting cylinder (21), a lower ring body (42) located below the upper ring body (41), multiple uprights (43) that are misaligned with the secondary pressure relief hole (24) and connect the upper ring body (41) and the lower ring body (42), and a filter screen (44) that covers the secondary pressure relief hole (24). The filter screen (44) filters the medium so that impurities cannot reach the secondary pressure relief hole (24).

2. A shut-off valve with stable pressure relief function according to claim 1, characterized in that: The outer wall of the lower ring (42) is provided with a plurality of lugs (45) that can be positioned on the sealing flap (22) by bolts.

3. A shut-off valve with a stable pressure relief function according to claim 1 or 2, characterized in that: The upper surface of the sealing flap (22) is inclined downward relative to the horizontal surface, and the height of the edge of the upper surface of the sealing flap (22) is at its lowest.

4. A shut-off valve with a stable pressure relief function according to claim 1 or 2, characterized in that: The inner wall of the upper ring (41) is provided with a sealing ring (5) for fitting against the outer wall of the connecting cylinder (21).

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