Dark bar low pressure drop gate valve

Abstract

The utility model discloses a low pressure drop gate valve of dark rod type, including the valve body and the upper valve cover of screw connection at its top, the inside rotation connection of upper valve cover has the adjusting screw rod, the inside slide of valve body is provided with the gate valve body, and is connected with the rod wall screw thread of adjusting screw rod, the left and right sides surface of gate valve body all are inclined surface settings, two inclined surfaces all are connected with seal seat, and the outside wall of two seal seat all is equipped with the matching trapezoidal seal seat, and the outside wall of two trapezoidal seal seat is arranged the protruding along the downward direction of inclined surface, because the utility model discloses the inclined surface seal seat of setting left and right sides of gate valve body, and with the trapezoidal seal seat of corresponding in valve body forms the wedge cooperation, when the gate plate is closed and moves down, the protruding of inclined surface and trapezoidal seal seat produces the mechanical wedge tightness of more and more tight, and the seal seat is continuously pressed to valve seat, forms additional sealing specific pressure, and this structure no longer depends on medium pressure, even in low pressure or pressure fluctuation working condition, still can guarantee reliable sealing, significantly reduces the internal leakage rate, prolongs the life.

Description

Technical Field

[0001] This utility model relates to the technical field of gate valves, specifically to a non-rising stem type low pressure drop gate valve. Background Technology

[0002] Non-rising stem gate valves are widely used in low-pressure (≤1.6 MPa) clean water transmission pipelines such as municipal water supply and drainage, secondary water supply in buildings, agricultural irrigation, and HVAC systems. Currently, gate valves on the market are divided into two categories according to whether the valve stem is exposed: rising stem and non-rising stem. In rising stem gate valves, the valve stem and handwheel rise and fall synchronously, making it easy to observe the opening and closing status. However, the exposed valve stem requires height protection and is mostly used in high-pressure conditions. Non-rising stem gate valves, on the other hand, have the valve stem and transmission nut completely enclosed inside the valve body, resulting in a compact appearance and not taking up upper space. Therefore, they are more suitable for low-pressure clean water systems.

[0003] Currently, most low-pressure non-steam gate valves on the market rely solely on the medium pressure to press the gate against the valve seat. Once the system pressure fluctuates or is insufficient, the sealing pressure drops, making internal leakage very easy to occur. The metal-to-metal hard seal between the gate and the valve seat is extremely sensitive to particulate impurities. After long-term operation, impurities accumulate at the bottom of the valve body and on the surface of the sealing surface, causing scratches and wear, further deteriorating the sealing performance. Existing maintenance methods require the complete disassembly of the valve cover, valve stem, and gate, which is a complex, time-consuming, and labor-intensive process. In addition, the on-site space is often confined, and the maintenance window is short.

[0004] Therefore, a low-pressure-drop gate valve with a non-stick stem is proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the problem that existing low-pressure non-stick gate valves rely solely on the medium pressure to press the gate plate against the valve seat. Once the system pressure fluctuates or is insufficient, the sealing specific pressure will decrease. At the same time, after long-term operation of the equipment, impurities will accumulate at the bottom of the valve body and on the surface of the sealing pair, making cleaning difficult.

[0006] The technical solution adopted to solve the above technical problems is: A non-sunken stem low-pressure drop gate valve includes a valve body and an upper valve cover threaded to its top. An adjusting screw is rotatably connected inside the upper valve cover. A gate valve body is slidably disposed inside the valve body and threadedly connected to the stem wall of the adjusting screw. Both sides of the gate valve body are beveled, and sealing seats are connected to both beveled surfaces. The outer walls of the two sealing seats are provided with matching trapezoidal sealing seats. The outer walls of the two trapezoidal sealing seats have protrusions arranged downwards along the bevel, so that the sealing seats contact the trapezoidal sealing seats more tightly as they move downwards. A trapezoidal inspection port is provided at the bottom of the valve body near the lower end of the gate valve body. A matching sealing cover is provided inside the trapezoidal inspection port. A clamping mechanism is provided at the lower end of the sealing cover to tightly press the sealing cover against the inside of the trapezoidal inspection port, ensuring a good seal inside the valve body.

[0007] As a preferred technical solution of this utility model, the trapezoidal inspection port is provided with a sealing ring inside, and both the sealing seat and the sealing ring are made of corrosion-resistant hard rubber material.

[0008] As a preferred technical solution of this utility model, the clamping mechanism includes a side top seat and a main top seat that are respectively fixedly connected to the bottom sides and the middle of the sealing cover. The two side top seats and the main top seat are provided with matching clamping seats inside. A top rod is inserted into the bottom of the clamping seat. A mounting seat is threadedly connected to the rod wall of the top rod. A locking bolt is threadedly connected to the lower part of the rod wall of the mounting seat. The mounting seat is fixedly connected to the valve body.

[0009] As a preferred embodiment of this utility model, the outer walls of the mounting base are respectively connected to fixing seats by fixing bolts, and the outer walls of the two fixing bolts are respectively connected to fixing nuts, and the two fixing seats are respectively fixedly installed on the outer walls of the valve body.

[0010] As a preferred technical solution of this utility model, the interior of both side top seats and the main top seat is provided with elastic sealing blocks to enhance interference sealing.

[0011] As a preferred embodiment of this utility model, the lower end of the top rod is connected to a fixing head, which is made of alloy steel.

[0012] As a preferred technical solution of this utility model, the outer side of the clamping mechanism is provided with a matching support seat, the support seat is fixedly installed on the outer side wall of the valve body, the bottom of the support seat is provided with an installation base plate, and the interior of the support seat is provided with a maintenance cavity.

[0013] The beneficial effects of this utility model are as follows: I. This utility model provides inclined sealing seats on the left and right sides of the gate valve body, which form a wedge fit with the corresponding trapezoidal sealing seat in the valve body. When the gate moves down to close, the protrusions of the inclined surfaces and trapezoidal sealing seats generate a mechanical wedge force that tightens as the valve closes, continuously pressing the sealing seat against the valve seat to form an additional sealing pressure. This structure no longer depends on the medium pressure and can still ensure reliable sealing even under low pressure (≤1.6 MPa) or pressure fluctuation conditions, significantly reducing internal leakage and extending service life. II. Addressing the pain point that existing equipment requires complete disassembly and cleaning after impurities accumulate, making maintenance difficult, this utility model features a trapezoidal inspection port at the bottom of the valve body, equipped with a sealing cover. The sealing cover, through a clamping mechanism, forms a quick-disassembly and assembly combination structure with the top rod, top clamping seat, side top seat, and main top seat. During maintenance, only the locking bolts need to be loosened to lower the sealing cover, directly cleaning particulate impurities at the bottom of the valve body and the sealing surface. There is no need to disassemble the valve cover, valve stem, and gate, significantly shortening maintenance time and reducing labor intensity. It is especially suitable for confined spaces such as underground well chambers and suspended ceiling mezzanines. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the valve body of this utility model; Figure 3 This is a schematic diagram of the clamping mechanism of this utility model; Figure 4 for Figure 3 A schematic diagram of the main cross-sectional structure in the middle; Figure 5 This is a schematic diagram of the overall appearance structure of this utility model.

[0015] In the diagram: 1. Valve body; 2. Upper valve cover; 3. Adjusting screw; 4. Gate valve body; 5. Trapezoidal sealing seat; 6. Sealing seat; 7. Trapezoidal inspection port; 8. Sealing ring; 9. Sealing cover; 10. Side top seat; 11. Main top seat; 12. Tightening seat; 13. Top rod; 14. Mounting seat; 15. Locking bolt; 16. Fixing head; 17. Fixing seat; 18. Fixing bolt; 19. Fixing nut; 20. Support seat; 21. Mounting base plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0021] Example 1 exist Figures 1-5 This utility model provides a technical solution: a low-pressure drop gate valve with a non-sunken stem, including a valve body 1 and an upper valve cover 2 threadedly connected to its top. An adjusting screw 3 is rotatably connected inside the upper valve cover 2. A gate valve body 4 is slidably disposed inside the valve body 1 and threadedly connected to the stem wall of the adjusting screw 3. Both sides of the gate valve body 4 are inclined surfaces, and sealing seats 6 are connected to both inclined surfaces. The outer walls of the two sealing seats 6 are provided with matching trapezoidal sealing seats 5. The outer walls of the two trapezoidal sealing seats 5 have protrusions arranged downwards along the inclined surfaces, forming conical cavities on both sides, causing the gate valve body 4 to move... As the sealing seat 6 moves downward, it contacts the trapezoidal sealing seats 5 on both sides more tightly, improving the sealing effect of the gate valve body 4 under sealed conditions, rather than relying solely on medium pressure to enhance the seal. A trapezoidal inspection port 7 is provided at the bottom of the valve body 1 near the lower end of the gate valve body 4. A matching sealing cover 9 is provided inside the trapezoidal inspection port 7. A clamping mechanism is provided at the lower end of the sealing cover 9 to tightly press the sealing cover 9 against the inside of the trapezoidal inspection port 7, ensuring the sealing effect inside the valve body 1. A sealing ring 8 is provided inside the trapezoidal inspection port 7. Both the sealing seat 6 and the sealing ring 8 are made of corrosion-resistant hard rubber material.

[0022] In one aspect of this embodiment, the clamping mechanism includes side top seats 10 and main top seats 11, which are respectively fixedly connected to the bottom sides and the middle of the sealing cover 9. The two side top seats 10 and the main top seats 11 are provided with matching clamping seats 12 inside. The side top seats 10 and the main top seats 11 are distributed in this way to enhance the uniformity of the upward force of the sealing cover 9 and improve the sealing effect of the sealing cover 9 inside the trapezoidal inspection port 7. A top rod 13 is inserted into the bottom of the clamping seat 12. The rod wall of the top rod 13 is threadedly connected to the mounting seat 14. The lower part of the rod wall of the mounting seat 14 is threadedly connected to the locking bolt 15. The mounting seat 14 is fixedly connected to the valve body 1. During maintenance and cleaning, by rotating the top rod 13, the clamping seat 12 is driven to disengage from the interior of the corresponding side top seats 10 and the main top seats 11, thereby realizing the removal of the sealing cover 9 from the interior of the trapezoidal inspection port 7 and making it convenient to clean the internal particulate impurities without disassembling the valve body 1 as a whole.

[0023] In one aspect of this embodiment, the outer walls of the mounting base 14 are threadedly connected to the mounting base 17 by fixing bolts 18, and the outer walls of the two fixing bolts 18 are threadedly connected to fixing nuts 19. The two fixing bases 17 are fixedly installed on the outer walls of the valve body 1. The entire clamping mechanism can be disassembled by the fixing bases 17, fixing bolts 18 and fixing nuts 19, which facilitates subsequent operations.

[0024] In one aspect of this embodiment, elastic sealing blocks are provided inside both side top seats 10 and main top seat 11 to enhance interference sealing. The lower end of the top rod 13 is connected to a fixing head 16, which is made of alloy steel to improve the service life of the fixing head 16 and facilitate the rotation of the top rod 13.

[0025] In one aspect of this embodiment, a matching support seat 20 is provided on the outer side of the clamping mechanism. The support seat 20 is fixedly installed on the outer side wall of the valve body 1. An installation base plate 21 is installed at the bottom of the support seat 20. An inspection cavity is provided inside the support seat 20, through which the sealing cover 9 can be easily disassembled.

[0026] The working principle of this utility model is as follows: First, the valve body 1 is integrally cast, and the inner cavity is precision machined to form a symmetrical trapezoidal sealing seat 5 with inclined surfaces. A trapezoidal inspection port 7 is reserved at the bottom. After the inclined surfaces are milled on both sides of the gate valve body 4, a corrosion-resistant hard rubber sealing seat 6 is embedded to ensure that the inclined surfaces and the sealing seat 6 are vulcanized as one. After the adjusting screw 3 is assembled with the upper valve cover 2, it is screwed into the top of the valve body 1 as a whole, so that the gate valve body 4 is linked with the adjusting screw 3 through the threaded pair to realize the function of raising and lowering the hidden rod. After the main body is assembled, the sealing ring 8 is pressed into the trapezoidal inspection port 7, and then the sealing cover 9 is placed in, which, together with the side top seat 10, the main top seat 11 and the top tightening seat 12, forms a three-point distributed uniform support. The top rod 13 passes through the mounting seat 14 and cooperates with the locking bolt 15. By rotating the fixing head 16, the top rod 13 can be raised and lowered, which drives the top tightening seat 12 to press or release the sealing cover 9, realizing a leak-free and fast locking. During on-site operation, the handwheel drives the adjusting screw 3 to rotate, and the gate valve body 4 moves down along the guide rail. The protrusions of the inclined sealing seat 6 and the trapezoidal sealing seat 5 generate a wedging force that tightens as the valve closes, forming an additional sealing pressure. This completely eliminates the dependence on the medium pressure and ensures zero leakage under low-pressure conditions of ≤1.6MPa. When maintenance is required, simply loosen the locking bolt 15 and lower the top rod 13 to remove the sealing cover 9 in the maintenance cavity of the support seat 20. This allows for direct cleaning of particulate impurities at the bottom of the valve body 1 and the sealing surfaces without disassembling the valve cover 2, adjusting screw 3, and gate valve body 4. The entire maintenance process can be completed within 10 minutes in a confined space, significantly reducing downtime and labor intensity.

[0027] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A low-pressure drop gate valve with a non-sunken stem, comprising a valve body (1) and an upper valve cover (2) threadedly connected to its top, wherein an adjusting screw (3) is rotatably connected inside the upper valve cover (2), and a gate valve body (4) is slidably disposed inside the valve body (1) and threadedly connected to the stem wall of the adjusting screw (3), characterized in that: The left and right sides of the gate valve body (4) are both inclined surfaces, and a sealing seat (6) is connected to each of the two inclined surfaces. The outer walls of the two sealing seats (6) are provided with matching trapezoidal sealing seats (5). The outer walls of the two trapezoidal sealing seats (5) are arranged with protrusions in the downward direction along the inclined surface, so that the sealing seat (6) moves downward and contacts the trapezoidal sealing seat (5) more tightly. The bottom of the valve body (1) is provided with a trapezoidal inspection port (7) near the lower end of the gate valve body (4). The inside of the trapezoidal inspection port (7) is provided with a matching sealing cover (9). The lower end of the sealing cover (9) is provided with a pressing mechanism to tightly press the sealing cover (9) against the inside of the trapezoidal inspection port (7) to ensure the sealing effect inside the valve body (1).

2. The low-pressure-drop gate valve with a non-sunken stem according to claim 1, characterized in that: The trapezoidal inspection port (7) is provided with a sealing ring (8) inside. Both the sealing seat (6) and the sealing ring (8) are made of corrosion-resistant hard rubber material.

3. The low-pressure-drop gate valve with a non-sunken stem according to claim 1, characterized in that: The clamping mechanism includes a side top seat (10) and a main top seat (11) fixedly connected to the bottom sides and the middle of the sealing cover (9), respectively. The two side top seats (10) and the main top seat (11) are provided with matching clamping seats (12). A top rod (13) is inserted into the bottom of the clamping seat (12). The rod wall of the top rod (13) is threadedly connected to a mounting seat (14). The lower part of the rod wall of the mounting seat (14) is threadedly connected to a locking bolt (15). The mounting seat (14) is fixedly connected to the valve body (1).

4. The low-pressure-drop gate valve with a non-sunken stem according to claim 3, characterized in that: The outer side walls of the mounting base (14) are threadedly connected to the fixing bases (17) by fixing bolts (18), and the outer side walls of the two fixing bolts (18) are threadedly connected to fixing nuts (19). The two fixing bases (17) are fixedly installed on the outer side walls of the valve body (1).

5. The low-pressure-drop gate valve with a non-sunken stem according to claim 3, characterized in that: Both of the side top seats (10) and the main top seat (11) are provided with elastic sealing blocks inside to enhance interference sealing.

6. The low-pressure-drop gate valve with a non-sunken stem according to claim 3, characterized in that: The lower end of the top rod (13) is connected to a fixing head (16), which is made of alloy steel.

7. The low-pressure-drop gate valve with a non-sunken stem according to claim 1, characterized in that: The outer side of the clamping mechanism is provided with a matching support seat (20), the support seat (20) is fixedly installed on the outer side wall of the valve body (1), the bottom of the support seat (20) is provided with an installation base plate (21), and the inside of the support seat (20) is provided with a maintenance cavity.

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