A single plate check valve

Abstract

The utility model discloses a single board check valve, including the valve body, the top fixedly connected with valve seat of valve body, is equipped with the valve stem on the valve seat and passes through, the top fixedly connected with operating disc of valve stem, the front and back both sides of operating disc all are equipped with protection mechanism, and the opening and closing of protection mechanism can be realized only through rotating the carousel with antiskid sleeve, need not with the help of special tool, and the operation is convenient and efficient. When needing to adjust the valve, reverse rotation carousel can make U -shaped board away from operating disc, and the plug rod is separated from the slot, and directly adjusts operating disc, and after adjusting, rotates carousel again to can re -lock protection mechanism. The whole process does not need to dismouting protection part, avoided the component damage problem that traditional protection structure led to because of frequently dismouting, reduced the work load and cost of daily maintenance greatly.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a single-plate check valve. Background Technology

[0002] Check valves, as key control components in fluid transport systems, are widely used in water supply and drainage, petrochemical, and HVAC industries. Their core function is to achieve unidirectional flow by relying on the pressure difference of the medium itself, preventing backflow that could cause equipment damage and reduced system efficiency. Single-plate check valves are particularly common in medium and low-pressure fluid systems due to their relatively simple structure and low flow resistance.

[0003] However, existing single-plate check valves still have the following significant shortcomings in practical use: 1. The control panel is susceptible to accidental interference: The opening and closing status of a single-plate check valve is usually adjusted via a control panel on top of the valve stem (such as manual assisted opening and closing or status locking). However, existing products generally lack effective protective structures for the control panel. In complex industrial environments, accidental contact by personnel or scraping by tools can easily cause the control panel to rotate unexpectedly, leading to displacement of the valve stem and valve core, resulting in abnormal valve opening and closing. This can not only disrupt the fluid delivery rhythm but also damage downstream equipment such as pumps and heat exchangers due to backflow of the medium.

[0004] 2. Poor stability of the control panel: Although some check valves have simple fixing structures for the control panel (such as pins or clips), the fixing method is mostly single-sided limiting and lacks an integrated linkage design with the valve seat. When the system vibrates or the medium pressure fluctuates, the fixing structure is prone to loosening, causing the relative position of the control panel and the valve stem to shift. This not only affects the accuracy of valve opening and closing but may also lead to medium leakage due to poor sealing of the valve core, reducing the reliability of system operation.

[0005] 3. Inconvenient maintenance of protective and fixed structures: Existing components used for protecting the control panel (such as protective covers and guards) are mostly bolted directly to the valve seat. Disassembly and assembly require special tools, and the protective state cannot be flexibly adjusted according to operational needs (for example, the protective components must be completely removed when adjusting the valve). This not only increases the workload of daily maintenance, but may also cause thread stripping and component deformation due to frequent disassembly and assembly, shortening the overall service life of the valve. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a single-plate check valve.

[0007] One of the objectives of this utility model is achieved through the following technical solution: A single-plate check valve includes a valve body, a valve seat fixedly connected to the top of the valve body, a valve stem extending through the valve seat, an operating panel fixedly connected to the top of the valve stem, and protective mechanisms provided on both the front and rear sides of the operating panel.

[0008] Furthermore, the protective mechanism includes a top groove formed on the valve seat, and two sliders are slidably connected to the inner cavity of the groove, with threaded holes formed on both sliders.

[0009] Furthermore, a bidirectional lead screw passes through the inner cavity of both threaded holes, and the rear end of the bidirectional lead screw is movably connected to the rear side wall of the inner cavity of the slide groove.

[0010] Furthermore, the front end of the bidirectional lead screw penetrates the front sidewall of the slide groove and is movably connected to it. A turntable is fixedly connected to the front end of the bidirectional lead screw, and an anti-slip sleeve is fitted on the outside of the turntable.

[0011] Furthermore, the operation panel is fitted with two U-shaped plates, which are arranged one in front of the other. A connecting rod is fixedly connected to the bottom of each of the two U-shaped plates, and the bottom ends of the two connecting rods are fixedly connected to the top of the adjacent sliders.

[0012] Furthermore, each of the two U-shaped plates has a fixed rod at the center of one corresponding side of its inner cavity, and slots are provided on both the front and rear sides of the outer wall of the operating panel. One end of each of the two rods extends into the inner cavity of the adjacent slot and fits into it.

[0013] Furthermore, connectors are fixedly connected to both the front and rear sides of the valve body, and each connector has several threaded holes for easy connection with a pipeline.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By installing a protective mechanism consisting of U-shaped plates, insert rods, and double-acting screws on both the front and rear sides of the control panel, a "two-way wrapping" limit can be achieved for the control panel. When the valve is adjusted to the target state, rotating the turntable drives the double-acting screw to rotate, causing the slider to slide relative to each other along the groove, so that the two U-shaped plates move closer to the control panel synchronously until the insert rod is inserted into the slot of the control panel. At this time, the U-shaped plates wrap around the control panel from the outside, and the insert rod locks its rotation trajectory from the inside. This double protection completely avoids accidental rotation of the control panel caused by personnel touching it or tools scraping it, ensuring that the valve always remains in the preset open / closed state and ensuring the stable operation of the fluid system.

[0015] 2. In the protective mechanism, the slider and the groove are in an "embedded" sliding fit, and the threaded hole of the double-acting screw and the slider are connected by a "high-precision" thread. This combination ensures that the locking force of the U-shaped plate and the insert rod on the operating panel is uniform and stable. Even under harsh conditions such as system vibration and media pressure fluctuations, the fit between the insert rod and the slot, and the wrapping of the U-shaped plate, will not loosen, effectively preventing relative displacement between the operating panel and the valve stem. This ensures that the sealing surfaces of the valve core and the valve seat are always tightly fitted, significantly reducing the risk of media leakage and improving the valve's sealing reliability and service life.

[0016] 3. The protective mechanism can be opened and closed simply by rotating the turntable with an anti-slip sleeve, without the need for special tools, making operation convenient and efficient. When valve adjustment is required, rotating the turntable in the opposite direction will move the U-shaped plate away from the operating panel and disengage the rod from the slot, allowing direct adjustment of the operating panel; after adjustment, rotating the turntable again will relock the protective mechanism. The entire process does not require disassembly of the protective components, avoiding the component damage problems caused by frequent disassembly and assembly in traditional protective structures, and significantly reducing the workload and cost of daily maintenance.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a perspective view of this embodiment; Figure 2 This is a schematic diagram of the U-shaped plate structure of the component in this embodiment; Figure 3 This is a schematic diagram of the component protection mechanism in this embodiment; Figure 4 This is a schematic diagram of the component groove in this embodiment.

[0019] In the diagram: 1. Valve body; 2. Connector; 3. Valve seat; 4. Valve stem; 5. Slide groove; 6. U-shaped plate; 7. Control panel; 8. Two-way lead screw; 9. Turntable; 10. Insert rod; 11. Connecting rod; 12. Slider; 13. Threaded hole; 14. Slot. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] This embodiment takes a single-plate check valve suitable for building water supply and drainage systems as an example. The nominal diameter of the check valve is DN100, the applicable medium is normal temperature tap water, and the working pressure is 0.1-1.0MPa.

[0024] I. Component Assembly Valve body and connector assembly: Select a cast iron valve body 1 with a pre-installed single-plate valve core inside (consistent with existing technology, not separately labeled). Weld steel connectors 2 to the front and rear sides of the valve body 1 respectively. Each connector 2 has 8 screw holes with a diameter of 12mm evenly opened around its circumference (screw hole spacing of 30mm). The screw holes are tapped with standard fine threads to adapt to different specifications of connecting bolts, meeting the flange connection requirements of DN100 galvanized steel pipe and PVC pipe.

[0025] Valve seat and stem installation: At the center of the top of the valve body 1, a cast steel valve seat 3 is fixedly connected by bolts. The valve seat 3 has a through hole that matches the valve stem 4. The stainless steel valve stem 4 passes through the through hole of the valve seat 3. The bottom of the valve stem 4 is connected to the single-plate valve core inside the valve body 1 by a key (to ensure that the valve stem can rotate to drive the valve core to open and close). A circular operating disc 7 (80mm in diameter with anti-slip texture on the edge) is welded to the top of the valve stem 4.

[0026] Assembly of protective mechanisms: A rectangular groove 5 (150mm in length, 20mm in width, and 15mm in depth) is opened on the top of the valve seat 3 along the front-back direction. Two rectangular sliders 12 (made of wear-resistant nylon and with dimensions that match the groove 5) are slidably connected inside the groove 5. A through threaded hole 13 (with internal thread that matches the double-acting screw 8) is opened in the middle of each slider 12.

[0027] A double-acting lead screw 8 made of No. 45 steel (180mm in length, with reverse threads in the middle section) is passed through the threaded holes 13 of the two sliders 12. The rear end of the double-acting lead screw 8 is movably connected to the rear side wall of the inner cavity of the slide groove 5 through a deep groove ball bearing, and the front end passes through the front side wall of the slide groove 5 (also movably connected through a deep groove ball bearing). A circular turntable 9 (50mm in diameter) is welded to the front end of the double-acting lead screw 8. A rubber anti-slip sleeve (with embossed texture on the surface to increase grip friction) is fitted on the outside of the turntable 9.

[0028] Prepare two U-shaped plates 6 (made of bent steel plates, with the opening facing the operating panel 7 and the inner side attached to the outer wall of the operating panel 7). The two U-shaped plates 6 correspond to the front and rear sides of the operating panel 7 respectively. Weld two connecting rods 11 (made of round steel, 30mm in length) to the bottom of each U-shaped plate 6. Weld the bottom end of the connecting rod 11 to the top of the corresponding slider 12 for fixation.

[0029] At the center of the opposite side of the inner cavity of each U-shaped plate 6, a cylindrical insert rod 10 (stainless steel material, diameter 8mm, length 20mm) is welded. At the same time, slots 14 (depth 15mm, inner diameter tightly fits the insert rod 10) are opened at corresponding positions on the front and rear sides of the outer wall of the operation panel 7.

[0030] Rainproof mechanism for the slide: A detachable rainproof cover (made of thin stainless steel sheet, slightly longer than the slide 5, and covering the slide 5 and the top of the sliders 12 on both sides) is installed on the top of the slide 5. The edge of the rainproof cover is fixed to the top of the valve seat 3 by buckles. The inner side of the cover fits against the opening of the slide 5 and leaves space for the slider 12 to slide. Rubber sealing strips are pasted on the contact parts between the rainproof cover and the valve seat 3 to prevent rainwater and dust from entering the interior of the slide 5 and affecting the sliding of the slider 12 and the transmission of the bidirectional screw 8.

[0031] II. Work Process Valve opening and closing adjustment: When it is necessary to open or close the check valve, first open the rainproof cover plate on the top of the slide groove 5, hold the anti-slip sleeve of the turntable 9, and rotate the turntable 9 clockwise or counterclockwise to drive the double-acting screw 8 to rotate. Since the middle section of the double-acting screw 8 has a reverse thread and meshes with the threaded holes 13 of the two sliders 12, when the double-acting screw 8 rotates, it will drive the two sliders 12 to slide in opposite directions along the slide groove 5 (when rotating clockwise, the sliders 12 move away from each other, and when rotating counterclockwise, they move closer to each other).

[0032] When the sliders 12 move away from each other, the connecting rod 11 drives the two U-shaped plates 6 to move away from the operating plate 7 simultaneously. The insert rod 10 on the U-shaped plate 6 gradually disengages from the slot 14 of the operating plate 7 until the insert rod 10 is completely out of the slot 14. At this time, the operating plate 7 is unlocked and can be rotated directly. The valve rod 4 drives the single-plate valve core in the valve body 1 to rotate, thereby realizing the opening or closing adjustment of the valve.

[0033] Operating panel locking and protection: After the valve is adjusted to the target opening / closing state (such as fully open or fully closed, or a specific opening degree), the turntable 9 is rotated in the opposite direction, causing the two sliders 12 to move closer to each other along the slide groove 5, driving the U-shaped plate 6 to move towards the operating panel 7 until the inner side of the U-shaped plate 6 is in contact with the outer wall of the operating panel 7. At the same time, the insert rod 10 on the U-shaped plate 6 is precisely inserted into the corresponding slot 14 of the operating panel 7, completing the locking of the operating panel 7 (the insert rod 10 restricts the rotation of the operating panel 7, and the U-shaped plate 6 prevents accidental contact from the outside). Subsequently, the rainproof cover plate at the top of the slide groove 5 is fastened and fixed to complete the overall protection.

[0034] Routine maintenance and adjustment: When the valve needs to be adjusted again, simply open the rain cover and rotate the turntable 9 to disengage the rod 10 from the slot 14. There is no need to disassemble the U-shaped plate 6, slider 12, or other components. If dust or impurities are found in the slide groove 5, the rain cover can be removed and the inside of the slide groove 5 can be cleaned directly to ensure that the slider 12 slides smoothly.

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A single-plate check valve, comprising a valve body (1), characterized in that: A valve seat (3) is fixedly connected to the top of the valve body (1), and a valve stem (4) is provided through the valve seat (3). An operating disc (7) is fixedly connected to the top of the valve stem (4), and protective mechanisms are provided on both the front and rear sides of the operating disc (7).

2. A single-plate check valve according to claim 1, characterized in that: The protective mechanism includes a top groove (5) on the valve seat (3), and two sliders (12) are slidably connected to the inner cavity of the groove (5), and threaded holes (13) are provided on the two sliders (12).

3. A single-plate check valve according to claim 2, characterized in that: The inner cavities of the two threaded holes (13) are connected by a bidirectional lead screw (8), and the rear end of the bidirectional lead screw (8) is movably connected to the rear side wall of the inner cavity of the slide groove (5).

4. A single-plate check valve according to claim 3, characterized in that: The front end of the bidirectional lead screw (8) passes through the front side wall of the slide groove (5) and is movably connected to it. The front end of the bidirectional lead screw (8) is fixedly connected to a turntable (9), and the outside of the turntable (9) is covered with an anti-slip sleeve.

5. A single-plate check valve according to claim 4, characterized in that: The operation panel (7) is fitted with two U-shaped plates (6), which are arranged one in front of the other. The bottom of each U-shaped plate (6) is fixedly connected to a connecting rod (11), and the bottom of each connecting rod (11) is fixedly connected to the top of the adjacent slider (12).

6. A single-plate check valve according to claim 5, characterized in that: A plug rod (10) is fixedly connected to the center of one side of the inner cavity of the two U-shaped plates (6). Slots (14) are provided on both the front and rear sides of the outer wall of the operating plate (7). One end of each plug rod (10) extends into the inner cavity of the adjacent slot (14) and fits against it.

7. A single-plate check valve according to claim 1, characterized in that: The valve body (1) is fixedly connected to both the front and rear sides with connectors (2), and each connector (2) has several screw holes for easy connection with the pipeline.

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