Balanced check valve

Abstract

The utility model discloses a balanced check valve, and particularly relates to the technical field of check valves, which comprises a shell, a first outlet end is arranged at the upper end of the shell, a second outlet end is arranged at the lower part of the shell, and a cabin is fixedly connected to the lower part of the right end of the shell. Overpressure release devices are symmetrically connected to the middle sides of the upper portions of the left end and the right end of the shell in a threaded mode, a valve assembly is jointly installed between the shell and the cabin, and the first outlet end communicates with the second outlet end. According to the balance type check valve, when the pressure of a medium in a container exceeds a set value, the overpressure release device can be automatically opened and release excessive pressure, so that equipment is prevented from being damaged due to overpressure, and after pressure release is completed, the overpressure release device can be automatically closed, so that the pressure of a system is balanced, and the service life of the system is prolonged. And the stability and the safety of the equipment are further ensured.

Description

Technical Field

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

[0002] A balanced check valve is a type of valve that automatically opens and closes its valve disc based on the flow of the medium itself, in order to prevent backflow of the medium and achieve system pressure balance.

[0003] In reality, when the external pressure of a valve exceeds the set pressure value, the valve needs to automatically release pressure because excessive pressure may cause system problems such as equipment rupture and seal failure. Therefore, a balanced check valve is required. Utility Model Content

[0004] The main purpose of this invention is to provide a balanced check valve that can effectively solve the problems mentioned above.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A balanced check valve includes a housing, a first outlet end at the upper end of the housing, a second outlet end at the lower part of the housing, a chamber fixedly connected to the lower right end of the housing, and overpressure relief devices symmetrically threaded to the upper middle parts of the left and right ends of the housing. A valve assembly is installed between the housing and the chamber.

[0007] Preferably, the first outlet end and the second outlet end are connected.

[0008] Preferably, the overpressure relief device includes a screw plug, which is threaded to the upper middle part of the left end of the housing. A sliding hole is provided in the middle of the left end of the housing, and a sealing mechanism is slidably connected in the middle of the inner cavity of the sliding hole. Through holes are provided in the upper and lower parts of the left wall of the sliding hole.

[0009] Preferably, both through holes are connected to the first outlet end.

[0010] Preferably, the sealing mechanism includes a connecting rod, which is slidably connected to the middle of the sliding hole. An auxiliary valve disc is fixedly connected to the right end of the connecting rod. A spring is sleeved on the left side of the outer surface of the connecting rod. A retaining ring is slidably connected to the left edge of the outer surface of the connecting rod. A nut is provided on the left side of the retaining ring. The nut is threadedly connected to the connecting rod.

[0011] Preferably, the left part of the spring is connected to the left wall of the sliding hole.

[0012] Preferably, the valve assembly includes a pin, which is fixedly connected to the right middle side of the front wall and rear wall of the housing. A lever block is rotatably connected to the outer surface of the pin. A counterweight is fixedly connected to the right side of the lever block. A main valve disc is fixedly connected to the left end of the lever block. A sealing plate is fixedly connected to the upper end of the main valve disc.

[0013] Preferably, the sealing sheet is fitted to the lower part of the inner cavity of the first outlet end.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This device features an overpressure relief mechanism that automatically opens when the pressure of the medium inside the container exceeds a set value, releasing excess pressure to prevent damage to the equipment due to overpressure. Once the pressure is released, the overpressure relief mechanism automatically closes, ensuring the stability and safety of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a schematic plan view of the overall structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the overpressure relief device of this utility model;

[0020] Figure 5 This is a schematic diagram of the sealing mechanism of this utility model;

[0021] Figure 6 This is a schematic diagram of the valve assembly structure of this utility model.

[0022] The following are marked in the diagram: 1. Outer shell; 2. First outlet end; 3. Overpressure relief device; 4. Chamber; 5. Second outlet end; 6. Valve assembly; 31. Plug; 32. Through hole; 33. Sealing mechanism; 34. Sliding hole; 331. Auxiliary valve disc; 332. Connecting rod; 333. Spring; 334. Retaining ring; 335. Nut; 61. Sealing plate; 62. Main valve disc; 63. Lever block; 64. Pin; 65. Counterweight. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, a balanced check valve includes a housing 1, a first outlet end 2 at the upper end of the housing 1, a second outlet end 5 at the lower part of the housing 1, a chamber 4 fixedly connected to the lower right end of the housing 1, an overpressure relief device 3 symmetrically threaded to the upper middle part of the left and right ends of the housing 1, and a valve assembly 6 installed between the housing 1 and the chamber 4.

[0025] Furthermore, the first outlet end 2 and the second outlet end 5 are connected.

[0026] This device is immersed in a container during implementation.

[0027] In the above-mentioned device, the device is placed in a container, and the first outlet end 2 is connected to an external pipeline. When the pressure of the medium in the container rises, it will push the two overpressure relief devices 3 to move closer to each other, so that the medium enters the first outlet end 2 from the overpressure relief device 3. Then the medium will be discharged from the first outlet end 2 to release the pressure. After the medium in the container is released, its pressure will gradually decrease. When the pressure of the medium pushes the overpressure relief device 3 to move, the overpressure relief device 3 will also generate pressure. When the pressure of the medium in the container is released to a level lower than the pressure generated by the overpressure relief device 3, the overpressure relief device 3 will release the pressure, causing the two overpressure relief devices 3 to move further apart, thus disconnecting the process of the medium in the container being released through the first outlet end 2.

[0028] In the above device, the valve assembly 6 is in a state of gravity balance under normal circumstances. When the overpressure relief device 3 is closed, some medium will remain in the first outlet end 2. At this time, the medium will push the valve assembly 6 to rotate downward, so that the medium flows back into the container. After the medium in the first outlet end 2 has finished flowing back, the valve assembly 6 will automatically close.

[0029] In the aforementioned device, this unit primarily enables overpressure relief and media recirculation of the medium. It ensures the valve operates normally under low pressure and low flow conditions.

[0030] Furthermore, in order to achieve the purpose of moving the overpressure relief device 3 when the pressure inside the container rises, and releasing the medium through the first outlet end 2, see [reference needed]. Figure 4 and Figure 5 The overpressure relief device 3 includes a screw plug 31, which is threaded to the upper middle side of the left end of the outer casing 1. A sliding hole 34 is provided in the middle of the left end of the outer casing 1. A sealing mechanism 33 is slidably connected in the middle of the inner cavity of the sliding hole 34. Through holes 32 are provided in the upper and lower parts of the left wall of the sliding hole 34.

[0031] Furthermore, both through holes 32 are connected to the first outlet end 2;

[0032] Furthermore, the sealing mechanism 33 includes a connecting rod 332, which is slidably connected to the middle of the sliding hole 34. An auxiliary valve disc 331 is fixedly connected to the right end of the connecting rod 332. A spring 333 is sleeved on the left side of the outer surface of the connecting rod 332. A retaining ring 334 is slidably connected to the left edge of the outer surface of the connecting rod 332. A nut 335 is provided on the left side of the retaining ring 334. The nut 335 is threadedly connected to the connecting rod 332.

[0033] Furthermore, the left side of spring 333 is connected to the left wall of sliding hole 34.

[0034] In the above device, when the pressure of the medium inside the container rises, the medium will push the through hole 32 to push the auxiliary valve 331 to move towards the side closer to the middle of the inner cavity of the first outlet end 2. When the auxiliary valve 331 moves, it will open the flow between the through hole 32 and the first outlet end 2, so that the medium flows from the through hole 32 into the first outlet end 2 to release the pressure.

[0035] In the above-mentioned device, when the auxiliary valve disc 331 moves, it will drive the connecting rod 332 to move together. When the connecting rod 332 moves, it will drive the retaining ring 334 and the nut 335 to move together. At this time, the retaining ring 334 will squeeze the sealing mechanism 33 to generate pressure. After the pressure of the medium in the container is released, it will gradually decrease. When the pressure of the medium is less than the pressure of the spring 333, the sealing mechanism 33 will release the pressure and push the retaining ring 334 to move back to its original position. The retaining ring 334 will drive the nut 335 and the connecting rod 332 to move together. When the connecting rod 332 moves, it will drive the auxiliary valve disc 331 to move back to its original position, so that the auxiliary valve disc 331 closes the through hole 32, disconnects the flow between the through hole 32 and the first outlet end 2, and realizes the pressure release of the medium.

[0036] In the above-mentioned device, the overpressure relief device 3 can be automatically opened to release excess pressure, thereby preventing the equipment from being damaged due to overpressure.

[0037] Furthermore, in order to achieve the purpose of media recirculation through valve assembly 6, see [reference needed]. Figure 6 The valve assembly 6 includes a pin 64, which is fixedly connected to the right middle side of the front and rear walls of the housing 1. A lever block 63 is rotatably connected to the outer surface of the pin 64. A counterweight block 65 is fixedly connected to the right side of the lever block 63. A main valve disc 62 is fixedly connected to the left end of the lever block 63. A sealing plate 61 is fixedly connected to the upper end of the main valve disc 62.

[0038] Furthermore, the sealing sheet 61 is fitted into the lower part of the inner cavity of the first outlet end 2.

[0039] In the above device, the main valve disc 62 and the counterweight 65 are in a state of balance under normal conditions. When the overpressure relief device 3 is closed, some medium will remain in the first outlet end 2. At this time, the medium will accumulate on the sealing plate 61, causing the balance between the main valve disc 62 and the counterweight 65 to disappear. This causes the main valve disc 62 to rotate downwards through the lever block 63 with the pin 64 as the center, allowing the medium to flow into the second outlet end 5 and then back into the container from the second outlet end 5, realizing the backflow of the medium. After the backflow of the medium in the first outlet end 2 is completed, the counterweight 65 and the main valve disc 62 will regain their balance under the action of the lever block 63, causing the main valve disc 62 to close the first outlet end 2 again, preventing the medium from flowing back.

[0040] In the above device, since the lever arm of the main valve disc 62 and the counterweight 65 differs greatly, the counterweight 65 needs to be made of 90W-7N I i-3Fe, which has a high density.

[0041] In the above-mentioned device, the sealing plate 61 can make the main valve disc 62 better seal the first outlet end 2, thereby improving the sealing performance of the valve assembly 6.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Balanced check valve comprising a housing (1), characterized in that: The first outlet end (2) and the second outlet end (5) are communicated.

2. A balanced check valve according to claim 1, characterized in that: The overpressure release device (3) comprises a screw plug (31), which is threadedly connected to the middle side of the upper left end of the shell (1); the shell (1) is provided with a sliding hole (34) in the middle of the left end; a sealing mechanism (33) is slidingly connected to the inner cavity of the middle of the sliding hole (34); and the upper and lower left walls of the sliding hole (34) are provided with through holes (32).

3. A balanced check valve according to claim 1, characterized in that: Both of the through holes (32) are communicated with the first outlet end (2).

4. A balanced check valve according to claim 3, characterized in that: The sealing mechanism (33) comprises a connecting rod (332), which is slidingly connected to the middle of the sliding hole (34); the right end of the connecting rod (332) is fixedly connected with an auxiliary valve flap (331); a spring (333) is sleeved on the left part of the outer surface of the connecting rod (332); a check ring (334) is slidingly connected to the left part of the outer surface of the connecting rod (332); the left part of the check ring (334) is provided with a nut (335), which is threadedly connected with the connecting rod (332).

5. A balanced check valve according to claim 3, wherein: The left part of the spring (333) is connected with the left wall of the sliding hole (34).

6. A balanced check valve according to claim 5, characterized in that: The valve assembly (6) comprises a pin shaft (64), which is fixedly connected to the middle side of the right part of the front wall and the rear wall of the shell (1); a force arm block (63) is rotatably connected to the outer surface of the pin shaft (64); a counterweight block (65) is fixedly connected to the right part of the force arm block (63); a main valve flap (62) is fixedly connected to the left end of the force arm block (63); and a sealing sheet (61) is fixedly connected to the upper end of the main valve flap (62).

7. A balanced check valve according to claim 1, wherein: The sealing sheet (61) is attached to the lower part of the inner cavity of the first outlet end (2).

8. A balanced check valve according to claim 7, characterized in that: ​

Images