Delayed and slow closing control valve with sewage discharge function

Abstract

The present invention relates to a time-delayed slow-closing control valve with a sewage discharge function, comprising a valve body, a valve seat, a valve disc and a valve stem, wherein the valve seat is mounted inside the valve body, the valve disc is mounted on the valve stem, and further comprises a spring and a valve cover with a cavity, the valve stem can be relatively slidably mounted on the valve seat, the valve disc is subjected to a preset spring preload force to form a sealing pair with the valve seat, the valve cover is mounted on the valve body, and a diaphragm is provided between the valve cover and the valve body, the valve disc is mounted on the lower side of the diaphragm and can be subjected to the pressure of a medium inside the valve cover cavity, a bypass pipe connecting the valve cover cavity and the valve body inlet end is provided between the valve cover and the valve body, and a sewage discharge bypass pipe is provided on the valve cover. The present invention can use the medium to control the opening and closing of the valve, and realize the functions of backwash and sewage discharge.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a time-delayed slow-closing control valve with a sewage discharge function. Background Art

[0002] With the development of urbanization, the urban population is increasing, and the construction of urban infrastructure is also accelerating, especially the treatment of sewage, rainwater and industrial wastewater. The demand for the extraction and discharge of sewage and industrial wastewater at the bottom of the prefabricated pump station is becoming increasingly severe. Due to the deposition of sewage impurities, on the one hand, it will cause drainage difficulties for the sewage pump, and even cause the pump unit to burn out and stop working; on the other hand, it will produce toxic and harmful gases to pollute the environment and cause safety hazards.

[0003] At present, there is no pump station product on the market that can use the medium in the pipeline to flush and stir the sediment at the bottom of the cylinder in a short time, close the valve automatically, and discharge the impurities deposited at the bottom of the cylinder. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a delayed slow-closing control valve with a sewage discharge function, which can use a medium to control the opening and closing of the valve to achieve the backwash and sewage discharge functions.

[0005] The technical solution adopted by the present invention to solve its technical problems is to provide a delayed slow-closing control valve with a sewage discharge function, including a valve body, a valve seat, a valve disc and a valve stem. The valve seat is installed inside the valve body, and the valve disc is installed on the valve stem. It also includes a spring and a valve cover with a cavity. The valve stem can be relatively slidably mounted on the valve seat. The valve disc forms a sealing pair with the valve seat under a preset spring preload. The valve cover is installed on the valve body and a diaphragm is provided between the valve cover and the valve body. The valve disc is installed on the lower side of the diaphragm and can be subjected to the pressure of the medium inside the valve cover cavity. A bypass pipe connecting the valve cover cavity and the valve body inlet end is provided between the valve cover and the valve body, and a sewage discharge bypass pipe is provided on the valve cover.

[0006] A sealing ring pressing plate is installed at the lower end of the valve disc, a sealing ring is installed between the valve disc and the sealing ring pressing plate, and the valve disc and the valve seat can be sealed by the sealing ring at the bottom of the valve disc.

[0007] The spring is located above the valve disc, and a pressure plate corresponding to the upper end of the valve disc is provided on the upper side of the diaphragm. The upper end of the pressure plate is pressed against the valve disc on the lower side of the diaphragm by the spring to form a pressing structure.

[0008] A spring mounting end plate is provided inside the cavity of the valve cover, and the upper end of the spring is fixed inside the mounting groove of the mounting end plate.

[0009] The center axis section of the valve disc is in an I-shape.

[0010] A maintenance drain orifice plate is provided on the top of the valve cover, and a sealing gasket is provided between the valve cover and the maintenance drain orifice plate.

[0011] A medium discharge bypass pipe is provided on the valve cover or the inspection and drainage orifice plate, and the inner diameter of the medium discharge bypass pipe is smaller than the inner diameter of the bypass pipe.

[0012] The bypass pipe and the sewage bypass pipe are arranged at the bottom of the valve cover.

[0013] The sewage bypass pipe is provided with a sewage valve, and the medium discharge bypass pipe is provided with an instrument needle valve.

[0014] The connection between the valve body and the valve cover is arranged as a concave opening structure.

[0015] Beneficial Effects

[0016] First, in the present invention, when the pressure of the medium at the valve inlet acting on the valve disc is greater than the spring preload, the valve automatically opens, and when the medium enters the valve cover cavity through the bypass pipe and the pressure exerted by the medium on the valve disc reaches the valve closing pressure, the valve automatically closes. Therefore, the present invention can control the opening and closing of the valve by using the medium.

[0017] Second, in the present invention, a bypass pipe is provided between the valve inlet end and the valve cover cavity. When the valve is opened, the medium can enter the valve cover cavity through the bypass pipe. Impurities in the medium can settle inside the valve cover cavity and deposit on the diaphragm and can be discharged or cleaned. After long-term operation of the valve, the valve can have a good sewage discharge effect on the pipeline.

[0018] Third, in the present invention, the medium stored in the valve cover cavity can be discharged into the pipeline before the valve along the bypass pipe after the medium pressure at the valve inlet end is released, which plays a recoil effect, thereby stirring the impurities deposited in the pipeline before the valve, which is beneficial to avoid blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0021] like Figure 1The delayed slow-closing control valve with a sewage discharge function shown in the figure includes a valve body 1, a valve seat 2, a sealing ring pressure plate 3, an O-ring 4, a valve disc 5, a valve stem 6, a bypass pipe 7, a diaphragm 8, a pressure plate 9, a spring 11, a sewage discharge valve 12, a sewage discharge bypass pipe 13, a valve cover with a cavity 14, a medium discharge bypass pipe 15, an instrument needle valve 16, a maintenance sewage discharge orifice plate 17 and a rubber sealing gasket 18.

[0022] The valve seat 2 is installed inside the valve body 1, and the lower end of the valve stem 6 can be slidably mounted on the valve seat 2 relative to the valve seat 2. The valve disc 5 is installed on the valve stem 6, and the valve stem 6 and the valve disc 5 can move up and down synchronously. The valve disc 5 and the valve seat 2 form a sealing pair that can control the opening and closing of the valve. The central axis section of the valve disc 5 is I-shaped, and a sealing ring pressing plate 3 is installed at the lower end of the valve disc 5. An O-ring 4 is installed between the valve disc 5 and the sealing ring pressing plate 3. The valve disc 5 and the valve seat 2 can be sealed by the sealing ring 4 at the bottom of the valve disc 5, thereby improving the reliability of the seal between the valve disc 5 and the valve seat 2 and achieving zero leakage when the valve is closed.

[0023] The valve cover 14 is installed on the valve body 1. The corresponding connection positions of the valve cover 14 and the valve body 1 are both open structures. The connection between the valve body 1 and the valve cover 14 is set as a concave structure, which is conducive to the storage of deposited dirt. A diaphragm 8 is arranged between the valve cover 14 and the valve body 1 to prevent medium leakage. The upper end of the valve disc 5 is installed on the lower side of the diaphragm 8. The upper side of the diaphragm 8 is provided with a pressure plate 9 corresponding to the upper end of the valve disc 5. The pressure plate 9 is connected and fixed by a nut 10. A spring 11 is installed on the upper end of the pressure plate 9. The cavity of the valve cover 14 is provided with a mounting end plate of the spring 11. The upper end of the spring 11 is fixed inside the mounting groove of the mounting end plate. The upper end of the pressure plate 9 is pressed by the spring 11 to form a pressing structure with the valve disc 5 on the lower side of the diaphragm 8. The valve disc 5 is sealed with the valve seat 2 by the pre-tightening force of the spring 11 to close the valve, and when there is medium inside the valve cover 14, the valve disc 5 can be subjected to the pressure of the medium inside the cavity of the valve cover 14.

[0024] A maintenance drain orifice plate 17 is provided on the top of the valve cover 14, and a sealing gasket 18 is provided between the valve cover 14 and the maintenance drain orifice plate 17. A medium discharge bypass pipe 15 is provided on the maintenance drain orifice plate 17, and the inner diameter of the medium discharge bypass pipe 15 is smaller than the inner diameter of the bypass pipe 7, and an instrument needle valve 16 is installed on the medium discharge bypass pipe 15.

[0025] A bypass pipe 7 is provided between the valve cover 14 and the valve body 1 to connect the valve cover 14 cavity and the inlet end of the valve body 1. The bypass pipe 7 is provided at the bottom of the valve cover 14 to increase the liquid level of the medium backwash. A sewage bypass pipe 13 is provided at the bottom of the valve cover 14, and a sewage valve 12 is provided on the sewage bypass pipe 13.

[0026] When the delayed slow closing control valve with sewage discharge function is in use: when the pressure of the medium at the valve inlet end acting on the valve disc 5 is greater than the preload force of the spring 11, the valve disc 5 and the valve stem 6 are lifted by the medium to open the valve, and at the same time the bypass pipe 7 can inject the medium into the cavity of the valve cover 14.

[0027] When the medium in the cavity of the valve cover 14 reaches the medium discharge bypass pipe 15, the medium discharge bypass pipe 15 discharges the medium in the cavity to the outside of the valve cover 14. Since the inner diameter of the bypass pipe 7 is larger than the inner diameter of the medium discharge bypass pipe 15, the injection speed of the medium in the cavity of the valve cover 14 is greater than the discharge speed. After a period of time, the pressure in the cavity of the valve cover 14 continues to rise after being filled with the medium. Until the pressure acting on the diaphragm 8 reaches the valve closing pressure, the valve disc 5 is pressed down to close the valve.

[0028] When the pressure at the valve inlet end is released, the medium in the valve cover 14 cavity will be discharged into the pipeline before the valve along the bypass pipe 7, which will play a recoil role, which is beneficial to avoid the accumulation of dirt in the pipeline before the valve and block the pipeline. The air will be discharged from the bypass pipe 15 along the medium and enter the valve cover 14 cavity.

[0029] Impurities in the medium inside the valve cover 14 cavity can settle inside the valve cover 14 cavity and deposit on the diaphragm 8. Therefore, after the valve has been running for a long time, impurities in the medium will be deposited at the bottom of the valve cover 14. At this time, the deposited dirt and impurities can be discharged or cleaned by opening the drain valve 12 or inspecting the drain orifice plate 17.

Claims

1. A time-delayed slow-closing control valve with a sewage discharge function, comprising a valve body (1), a valve seat (2), a valve disc (5) and a valve stem (6), wherein the valve seat (2) is mounted inside the valve body (1), and the valve disc (5) is mounted on the valve stem (6), characterized in that: It also includes a spring (11) and a valve cover (14) with a cavity, the valve stem (6) can be relatively slidably mounted on the valve seat (2), the valve disc (5) is subjected to a preset preload force of the spring (11) to form a sealing pair with the valve seat (2), the valve cover (14) is mounted on the valve body (1) and a diaphragm (8) is provided between the valve cover (14) and the valve body (1), the valve disc (5) is mounted on the lower side of the diaphragm (8) and can be subjected to the pressure of the medium inside the cavity of the valve cover (14), and the valve seat (2) is sealed. A bypass pipe (7) is provided between the valve cover (14) and the valve body (1) and communicates with the valve cover (14) cavity and the inlet end of the valve body (1). The valve cover (14) is provided with a sewage bypass pipe (13). A medium discharge bypass pipe (15) is provided at the top of the valve cover (14). The inner diameter of the medium discharge bypass pipe (15) is smaller than the inner diameter of the bypass pipe (7). The sewage bypass pipe (13) is provided with a sewage valve (12). The medium discharge bypass pipe (15) is provided with an instrument needle valve (16).

2. A time-delayed slow-closing control valve with sewage discharge function according to claim 1, characterized in that: A sealing ring pressing plate (3) is installed at the lower end of the valve disc (5), a sealing ring (4) is installed between the valve disc (5) and the sealing ring pressing plate (3), and the valve disc (5) and the valve seat (2) can be sealed by the sealing ring (4) at the bottom of the valve disc (5).

3. The delayed slow closing control valve with sewage discharge function according to claim 1, characterized in that: The spring (11) is located above the valve disc (5), and a pressure plate (9) corresponding to the upper end of the valve disc (5) is provided on the upper side of the diaphragm (8). The upper end of the pressure plate (9) is pressed against the valve disc (5) on the lower side of the diaphragm (8) by the spring (11) to form a pressing structure.

4. A time-delayed slow-closing control valve with sewage discharge function according to claim 3, characterized in that: A mounting end plate for the spring (11) is provided inside the housing cavity of the valve cover (14), and the upper end of the spring (11) is fixed inside a mounting groove of the mounting end plate.

5. The delayed slow closing control valve with sewage discharge function according to claim 1, characterized in that: The center axis cross section of the valve disc (5) is in an I-shape.

6. The delayed slow closing control valve with sewage discharge function according to claim 1, characterized in that: A maintenance drain orifice plate (17) is provided on the top of the valve cover (14), and a sealing gasket (18) is provided between the valve cover (14) and the maintenance drain orifice plate (17).

7. A time-delayed slow-closing control valve with sewage discharge function according to claim 6, characterized in that: The medium discharge bypass pipe (15) is arranged on the inspection and drainage orifice plate (17).

8. The delayed slow closing control valve with sewage discharge function according to claim 1, characterized in that: The bypass pipe (7) and the sewage bypass pipe (13) are arranged at the bottom of the valve cover (14).

9. The delayed slow closing control valve with sewage discharge function according to claim 1, characterized in that: The connection between the valve body (1) and the valve cover (14) is arranged as a concave opening structure.

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