Hydraulic safety butterfly valve

Abstract

According to the technical scheme, the hydraulic safety butterfly valve is characterized by comprising a valve body, a butterfly plate located in the valve body, a valve rod used for driving the butterfly plate to rotate and a hydraulic driver used for driving the valve rod to rotate, and the valve body comprises an inlet end and an outlet end which are located on the two sides of the butterfly plate respectively. A pressure relief end communicated with the inlet end is arranged on the peripheral wall of the valve body, the pressure relief end is provided with a pressure relief valve rod and a pressure relief butterfly plate, the pressure relief valve rod is parallel to the valve rod, the two ends of the pressure relief valve rod penetrate out of the pressure relief end, the pressure relief butterfly plate is used for blocking flowing of media in the pressure relief end and connected with the pressure relief valve rod, and the end, not connected with the hydraulic driver, of the valve rod penetrates out of the valve body and is in linkage with the pressure relief valve rod. When the valve rod controls the butterfly plate to be opened or closed relative to the valve body, the pressure relief valve rod is linked to enable the pressure relief butterfly plate to be closed or opened relative to the pressure relief end, and the problem that in the prior art, the butterfly plate and a connected pipeline are prone to damage is solved.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and more specifically to a hydraulic safety butterfly valve. Background Technology

[0002] As is well known, a butterfly valve, also called a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve where the closing element is a disc that rotates around the valve stem to achieve opening and closing. Butterfly valves can be used to control the flow of various types of fluids such as semi-water gas, steam, and flue gas. In pipelines, they primarily function as shut-off and throttling devices.

[0003] In existing butterfly valves, fluid flow is blocked after the butterfly plate is closed, and the pressure acts directly on one side of the butterfly plate. As the pressure increases, the butterfly plate is prone to deformation, which affects the sealing performance and operational safety of the butterfly valve. At the same time, the pipeline is filled with fluid and is under pressure, which makes the pipeline prone to deformation and damage. This places strict requirements on the selection of pipelines, thereby increasing the cost for users. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydraulic safety butterfly valve with a stable butterfly plate structure and a stable connected pipeline structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic safety butterfly valve, comprising a valve body, a butterfly plate located within the valve body, a valve stem for rotating the butterfly plate, and a hydraulic actuator for driving the valve stem to rotate. The valve body includes an inlet end and an outlet end located on both sides of the butterfly plate. A pressure relief end connected to the inlet end is provided on the peripheral wall of the valve body. The pressure relief end is provided with a pressure relief valve stem parallel to the valve stem and extending through both ends of the pressure relief end, and a pressure relief butterfly plate for blocking the flow of medium inside the pressure relief end and connected to the pressure relief valve stem. The end of the valve stem not connected to the hydraulic actuator extends through the valve body and is linked with the pressure relief valve stem. By controlling the butterfly plate to open or close relative to the valve body through the valve stem, the pressure relief valve stem is linked to cause the pressure relief butterfly plate to close or open relative to the pressure relief end.

[0006] As a further improvement of this utility model, a main shift fork is fixedly connected to the end of the valve stem that is not connected to the hydraulic actuator, and a secondary shift fork is fixedly connected to the end of the pressure relief valve stem on the same side as the main shift fork. A linkage rod is provided between the main shift fork and the secondary shift fork, and the two ends of the linkage rod are rotatably connected to one end of the main shift fork and the secondary shift fork, respectively.

[0007] The beneficial effects of this utility model are as follows: By controlling the butterfly plate to open or close relative to the valve body through the valve stem, the pressure relief valve stem is simultaneously linked to close or open the pressure relief butterfly plate relative to the pressure relief end. Compared with the prior art, this design can ensure that the medium pressure on the butterfly plate during opening and closing is not too high, and the medium pressure on the connected pipeline is also stable and within a reasonable range, effectively ensuring the structural stability of the connected pipeline and extending the service life of the valve body, butterfly plate and pipeline. Attached Figure Description

[0008] Figure 1 This is the front view of the present invention;

[0009] Figure 2 for Figure 1 Sectional view at point AA;

[0010] Figure 3 This is a rear view of the present invention;

[0011] Figure 4 This is a top view of the present invention;

[0012] Figure 5 for Figure 4 Sectional view at point BB.

[0013] Reference numerals: 1. Valve body; 11. Inlet end; 12. Outlet end; 13. Pressure relief end; 14. Pressure relief valve stem; 15. Pressure relief butterfly plate; 2. Butterfly plate; 3. Valve stem; 4. Hydraulic actuator; 5. Main shift fork; 6. Slave shift fork; 7. Linkage rod. Detailed Implementation

[0014] 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.

[0015] Reference Figures 1 to 5 As shown, a hydraulic safety butterfly valve of this embodiment includes a valve body 1, a butterfly plate 2 located inside the valve body 1, a valve stem 3 for driving the butterfly plate 2 to rotate, and a hydraulic actuator 4 for driving the valve stem 3 to rotate. The valve body 1 includes an inlet end 11 and an outlet end 12 located on both sides of the butterfly plate 2. The hydraulic actuator 4 can be a linear stroke type. A connecting plate is rotatably connected to the output shaft of the hydraulic actuator 4. A linkage fork that is rotatably connected to one end of the connecting plate is fixedly connected to one end of the valve stem 3. The output shaft of the hydraulic actuator 4 drives the valve stem 3 to rotate through linear movement.

[0016] Based on the aforementioned prior art, a pressure relief hole communicating with the inlet end 11 is opened on the peripheral wall of the valve body 1, and a pressure relief valve is fixedly connected to the port of the pressure relief hole. The pressure relief valve is sealed to the valve body 1. The pressure relief valve includes a valve body communicating with the inlet end 11 and serving as the pressure relief end 13, a pressure relief disc 15 located in the pressure relief end 13, and a pressure relief valve stem 14 that drives the pressure relief disc 15 to rotate. Both ends of the pressure relief valve stem 14 protrude through the pressure relief end 13, and both ends of the pressure relief valve stem 14 are sealed with packing and packing glands between them. The end of the valve stem 3 that is not connected to the hydraulic actuator 4 protrudes through the valve body 1. Furthermore, packing and packing glands are used for sealing. The end of valve stem 3 that is not connected to hydraulic actuator 4 is linked with pressure relief valve stem 14. There are various linkage structures, such as belt drive structure, gear drive structure, crank linkage structure, etc. Here, the crank linkage structure is preferred. The crank linkage structure includes a main shift fork 5, a driven shift fork 6 and a linkage rod 7. One end of the main shift fork 5 is fixedly sleeved on the end of valve stem 3 that is not connected to hydraulic actuator 4, and one end of the driven shift fork 6 is fixedly sleeved on the end of pressure relief valve stem 14 on the same side as the main shift fork 5. Then, the two ends of the linkage rod 7 are rotatably connected to one end of the main shift fork 5 and the driven shift fork 6, respectively.

[0017] In the initial state, the butterfly plate 2 is open relative to the valve body 1, the pressure relief butterfly plate 15 blocks the pressure relief end 13, the pressure relief end 13 is connected to the external pipeline, and the medium flows only from the inlet end 11 to the outlet end 12; during the process of the hydraulic actuator 4 driving the valve stem 3 to rotate, the valve stem 3 drives the main fork 5 to rotate, the main fork 5 drives the linkage rod 7 to move, the linkage rod 7 drives the secondary fork 6 to rotate, the secondary fork 6 drives the pressure relief butterfly plate 15 to rotate through the pressure relief valve stem 14, and the medium is diverted from the inlet end 11 to the outlet end 12 and the pressure relief end 13 until the butterfly plate 2 is closed relative to the valve body 1, the pressure relief butterfly plate 15 is open relative to the pressure relief end 13, the hydraulic actuator 4 stops operating, and the medium flows only from the inlet end 11 to the pressure relief end 13. The medium flowing to the pressure relief end 13 can be collected and reused, or used as a diversion function to divert the medium to other pipelines for use;

[0018] Compared with existing technologies, this design ensures that the medium pressure on the butterfly plate 2 during opening and closing will not be too high, and the medium pressure on the connected pipeline will also be stable and within a reasonable range, effectively ensuring the structural stability of the connected pipeline and extending the service life of the valve body 1, butterfly plate 2 and pipeline.

[0019] 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 hydraulic safety butterfly valve, comprising a valve body (1), a butterfly plate (2) located within the valve body (1), a valve stem (3) for rotating the butterfly plate (2), and a hydraulic actuator (4) for rotating the valve stem (3), wherein the valve body (1) includes an inlet end (11) and an outlet end (12) located on both sides of the butterfly plate (2), characterized in that: The valve body (1) is provided with a pressure relief end (13) connected to the inlet end (11) on its peripheral wall. The pressure relief end (13) is provided with a pressure relief valve stem (14) that is parallel to the valve stem (3) and extends through the pressure relief end (13) at both ends, and a pressure relief butterfly plate (15) that is used to block the flow of medium inside the pressure relief end (13) and is connected to the pressure relief valve stem (14). The end of the valve stem (3) that is not connected to the hydraulic actuator (4) extends through the valve body (1) and is linked with the pressure relief valve stem (14). The valve stem (3) controls the butterfly plate (2) to open or close relative to the valve body (1) while simultaneously linking the pressure relief valve stem (14) to close or open the pressure relief butterfly plate (15) relative to the pressure relief end (13).

2. The hydraulic safety butterfly valve according to claim 1, characterized in that: A main fork (5) is fixedly connected to the end of the valve stem (3) that is not connected to the hydraulic actuator (4). A slave fork (6) is fixedly connected to the end of the pressure relief valve stem (14) on the same side as the main fork (5). A linkage rod (7) is provided between the main fork (5) and the slave fork (6). The two ends of the linkage rod (7) are rotatably connected to one end of the main fork (5) and the slave fork (6), respectively.

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