Pressure relief stop valve

Abstract

A pressure relief stop valve comprises a valve body, a water inlet channel and a water outlet channel which are communicated with each other are arranged in the valve body, a valve rod penetrates into the valve body from the upper end of the valve body, and a valve clack is arranged at the lower end of the valve rod and corresponds to the communication position of the water inlet channel and the water outlet channel. A valve cover is arranged at the top end of the valve body, the upper end of the valve rod penetrates through the valve cover to be connected with a hand wheel, the valve rod is further sleeved with a limiting plate, the valve clack comprises a first valve clack and a second valve clack which are arranged at the bottom end of the valve rod in a sleeved mode, the first valve clack is located on the side, close to the water inlet channel, of the valve rod, and the top end of the first valve clack is connected with the bottom face of the limiting plate through a pressure relief spring. The second valve clack is fixedly connected to the side, close to the water outlet channel, of the valve rod. The top end of the second valve clack abuts against the bottom face of the limiting plate. A pressure relief opening is formed in the bottom of the side wall of the valve rod from one side of the water inlet channel to the end, facing the water outlet channel, of the second valve clack. When the valve is closed, the first valve clack and the second valve clack block the communication position of the water inlet channel and the water outlet channel, and the second valve clack blocks the valve rod from the water outlet channel.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure relief stop valve. Background Art

[0002] Stop valves are widely used in the manufacturing industry. When connecting a stop valve to a pipeline, it is necessary to have a certain pressure relief protection effect to better extend the service life of the stop valve and reduce the bursting of the pipeline. The pressure relief protection of existing stop valves usually adds a pressure relief device to the valve body additionally. When the medium is overpressured, it is discharged from the valve body through the pressure relief device, resulting in the problem of being prone to endanger the surrounding environment and personnel. Summary of the Invention

[0003] To solve the above problems, the utility model provides the following solutions:

[0004] A pressure relief stop valve includes a valve body. An inlet channel and an outlet channel that communicate with each other are arranged in the valve body. A valve stem extends into the valve body from the upper end of the valve body. A valve flap is arranged at the lower end of the valve stem, and the valve flap corresponds to the connection between the inlet channel and the outlet channel. A valve cover is arranged at the top end of the valve body. The upper end of the valve stem passes through the valve cover and is connected to a handwheel. A limiting plate is also sleeved on the valve stem. The valve flap includes a first valve flap and a second valve flap sleeved at the bottom end of the valve stem. The first valve flap is located on the side of the valve stem close to the inlet channel. The top end of the first valve flap is connected to the bottom surface of the limiting plate through a pressure relief spring. The second valve flap is fixedly connected to the side of the valve stem close to the outlet channel, and the top end of the second valve flap abuts against the bottom surface of the limiting plate. A pressure relief port is opened on the bottom of the side wall of the valve stem from the side of the inlet channel to the end of the second valve flap facing the outlet channel. When the valve is closed, the first valve flap and the second valve flap block the connection between the inlet channel and the outlet channel, and the second valve flap blocks the valve stem to the outlet channel.

[0005] Further, a guide groove is opened on the side wall of the lower part of the valve stem facing the inlet channel. The first valve flap is provided with a guide block corresponding to the guide groove. The guide block is embedded in the guide groove and can slide along the guide groove.

[0006] Further, a clamping plate is arranged at the bottom end of the guide groove. When the first valve flap is at the lowest position, the guide block abuts against the clamping plate.

[0007] Further, a sliding gasket is arranged between the first valve flap and the valve stem.

[0008] Further, valve flap gaskets are arranged on the bottom surface of the valve stem, the bottom surface of the first valve flap, and the bottom surface of the second valve flap.

[0009] The beneficial effects of the utility model are as follows:

[0010] A pressure relief port is provided at the lower part of the valve stem. The valve flap is divided into a first valve flap and a second valve flap. When the pressure in the water inlet passage rises above the normal value, the first valve flap rises under the action of the medium pressure, and the medium in the water inlet passage enters the water outlet passage through the pressure relief port to form pressure relief. After the pressure returns to normal, the first valve flap resets under the elastic force of the pressure relief spring to re-close the connection between the water inlet passage and the water outlet passage and the pressure relief port. Brief Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the present utility model.

[0012] 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Handwheel; 5. First valve flap; 6. Second valve flap; 7. Pressure relief port; 8. Water inlet passage; 9. Water outlet passage; 10. Connection between the water inlet passage and the water outlet passage; 11. Sliding gasket; 12. Valve flap gasket; 13. Limit plate; 14. Pressure relief spring. Detailed Description of the Embodiments

[0013] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further describes the present utility model in detail in conjunction with embodiments. To thoroughly understand the present utility model, some specific details will be involved in the following description. Without these specific details, the present utility model can still be realized, that is, those skilled in the art can more effectively introduce the essence of their work to other technicians in the field using these descriptions and statements here. In addition, it should be noted that it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the actual protection scope. All raw materials used in the following embodiments are commercially available products.

[0014] Embodiment 1: As Figure 1 shown, a pressure relief stop valve includes a valve body 1. An interconnected water inlet passage 8 and a water outlet passage 9 are provided inside the valve body 1. The valve stem 3 extends from the upper end of the valve body 1 into the valve body 1. A valve flap is provided at the lower end of the valve stem 3, and the valve flap corresponds to the connection 10 between the water inlet passage and the water outlet passage; a valve cover 2 is provided at the top of the valve body 1, and the upper end of the valve stem 3 passes through the valve cover 2 to connect to a handwheel 4. A limit plate 13 is also sleeved on the valve stem 3. The valve flap includes a first valve flap 5 and a second valve flap 6 sleeved at the bottom end of the valve stem 3. The first valve flap 5 is located on the side of the valve stem 3 close to the water inlet passage 8. The top of the first valve flap 5 is connected to the bottom surface of the limit plate 13 by a pressure relief spring 14. The second valve flap 6 is fixedly connected to the side of the valve stem 3 close to the water outlet passage 9, and the top of the second valve flap 6 abuts against the bottom surface of the limit plate 13; a pressure relief port 7 is opened on the bottom side of the valve stem 3 from the side of the water inlet passage 8 to the end of the second valve flap 6 facing the water outlet passage 9; when the valve is closed, the first valve flap 5 and the second valve flap 6 block the connection 10 between the water inlet passage and the water outlet passage, and the second valve flap 6 blocks the valve stem 3 to the water outlet passage 9.

[0015] A guide groove is provided on the side wall of the lower part of the valve stem 3 facing the water inlet channel 8, and a guide block is provided corresponding to the guide groove of the first valve flap 5, and the guide block is embedded in the guide groove and can slide along the guide groove. A clamping plate is provided at the bottom end of the guide groove, and the guide block and the clamping plate are against each other when the first valve flap 5 is at the lowest position. A sliding sealing gasket 11 is provided between the first valve flap 5 and the valve stem 3. A valve flap sealing gasket 12 is provided on the bottom surface of the valve stem 3, the bottom surface of the first valve flap 5, and the bottom surface of the second valve flap 6.

[0016] A pressure relief port 7 is provided at the lower part of the valve stem 3 of the utility model, and the valve flaps are divided into a first valve flap 5 and a second valve flap 6. When the pressure in the water inlet channel 8 rises above the normal value, the first valve flap 5 rises under the action of the medium pressure, and the second valve flap 6 still blocks the connection point 10 between the water inlet channel and the water outlet channel to the water outlet channel 9. The medium in the water inlet channel 8 enters the water outlet channel 9 through the pressure relief port 7 to form pressure relief. When the pressure is normal, the first valve flap 5 is reset under the elastic force of the pressure relief spring 14 and re-closes the connection point 10 between the water inlet channel and the water outlet channel and the pressure relief port 7.

[0017] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art from the present invention should be considered as the protection scope of the present invention.

Claims

1. A pressure relief stop valve, comprising a valve body, wherein a water inlet channel and a water outlet channel are connected to each other, a valve stem extends from the upper end of the valve body into the valve body, a valve disc is arranged at the lower end of the valve stem, and the valve disc corresponds to the connection between the water inlet channel and the water outlet channel; a valve cover is arranged at the top of the valve body, and the upper end of the valve stem passes through the valve cover and is connected to a hand wheel, characterized in that: The valve stem is also provided with a limit plate, and the valve flap comprises a first valve flap and a second valve flap which are mounted on the bottom end of the valve stem, the first valve flap is located on the side of the valve stem close to the water inlet channel, the top end of the first valve flap is connected to the bottom surface of the limit plate by a pressure relief spring, the second valve flap is fixedly connected to the side of the valve stem close to the water outlet channel, and the top end of the second valve flap is against the bottom surface of the limit plate; a pressure relief port is provided at the bottom of the side wall of the valve stem from the side of the water inlet channel to the end of the water outlet channel facing the second valve flap; when the valve is closed, the first valve flap and the second valve flap block the connection between the water inlet channel and the water outlet channel, and the second valve flap blocks the valve stem to the water outlet channel.

2. A pressure relief stop valve as claimed in claim 1, characterized in that: A guide groove is provided on the side wall of the lower part of the valve stem facing the water inlet channel, and a guide block is provided corresponding to the guide groove of the first valve flap, and the guide block is embedded in the guide groove and can slide along the guide groove.

3. A pressure relief stop valve as claimed in claim 2, characterized in that: A clamping plate is arranged at the bottom end of the guide groove, and the guide block abuts against the clamping plate when the first valve flap is at the lowest position.

4. A pressure relief stop valve as claimed in claim 1, characterized in that: A sliding sealing gasket is arranged between the first valve flap and the valve stem.

5. A pressure relief stop valve as claimed in claim 1, characterized in that: The bottom surface of the valve stem, the bottom surface of the first valve disc and the bottom surface of the second valve disc are all provided with valve disc sealing pads.

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