Balanced check valve

Abstract

The balance type check valve comprises a shell, a first outlet end is formed in the upper end of the shell, a second outlet end is formed in the lower portion of the shell, a cabin is fixedly connected to the lower portion of the right end of the shell, and overpressure releasing 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 installed between the shell and the cabin, and the first outlet end is communicated 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 to release excessive pressure, so that equipment is prevented from being damaged due to overpressure, after pressure release is completed, the overpressure release device can be automatically closed, 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] The invention relates to the technical field of check valves, and in particular to a balanced check valve. Background Art

[0002] A balanced check valve is a valve that automatically opens and closes the valve disc by the flow of the medium itself to prevent the medium from flowing back and achieve system pressure balance.

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

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

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A balanced check valve comprises a shell, wherein the upper end of the shell is provided with a first outlet end, the lower part of the shell is provided with a second outlet end, the lower right end of the shell is fixedly connected to a cabin, the middle sides of the upper left and right ends of the shell are symmetrically threadedly connected to an overpressure release device, and a valve assembly is installed between the shell and the cabin.

[0007] Preferably, the first outlet port and the second outlet port are communicated with each other.

[0008] Preferably, the overpressure release device includes a screw plug, which is threadedly connected to the middle side of the upper left end of the shell, a sliding hole is opened in the middle of the left end of the shell, a sealing mechanism is slidably connected to the middle of the inner cavity of the sliding hole, and through holes are opened in the upper and lower parts of the left wall of the sliding hole.

[0009] Preferably, the two through holes are both communicated with the first outlet end.

[0010] Preferably, the sealing mechanism includes a connecting rod, which is slidably connected to the middle part of the sliding hole, and the right end of the connecting rod is fixedly connected to an auxiliary valve flap, a spring is sleeved on the left part of the outer surface of the connecting rod, and a retaining ring is slidably connected at the left edge of the outer surface of the connecting rod, and a nut is provided on the left part of the retaining ring, and the nut is threadedly connected to the connecting rod.

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

[0012] Preferably, the valve assembly includes a pin shaft, which is fixedly connected to the middle side of the right part of the front wall and the rear wall of the outer shell, the outer surface of the pin shaft is rotatably connected to a force arm block, the right part of the force arm block is fixedly connected to a counterweight block, the left end of the force arm block is fixedly connected to a main valve flap, and the upper end of the main valve flap is fixedly connected to a sealing plate.

[0013] Preferably, the sealing sheet is in contact with the lower portion of the inner cavity of the first outlet end.

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

[0015] The device is designed with an overpressure release device, which can automatically open and release excess pressure when the medium pressure in the container exceeds the set value, thereby preventing the equipment from being damaged due to overpressure. When the pressure is released, the overpressure release device will automatically close, thereby ensuring the stability and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0018] Figure 3 It is a schematic plan view of the overall structure of the present invention;

[0019] Figure 4 It is a schematic structural diagram of the overpressure release device of the present invention;

[0020] Figure 5 It is a schematic diagram of the sealing mechanism structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the valve assembly of the present invention.

[0022] Markings in the figure are: 1. outer shell; 2. first outlet port; 3. overpressure relief device; 4. cabin; 5. second outlet port; 6. valve assembly; 31. screw 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 arm block; 64. pin shaft; 65. counterweight block. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0024] like Figure 1 , Figure 2 and Figure 3As shown, a balanced check valve comprises a housing 1, a first outlet port 2 is provided at the upper end of the housing 1, a second outlet port 5 is provided at the lower part of the housing 1, a cabin 4 is fixedly connected to the lower right end of the housing 1, an overpressure release device 3 is symmetrically threadedly connected to the middle side of the upper left and right ends of the housing 1, and a valve assembly 6 is installed between the housing 1 and the cabin 4;

[0025] Furthermore, the first outlet port 2 and the second outlet port 5 are communicated with each other.

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

[0027] In the above device, the device is placed in a container, and the first outlet end 2 is connected to an external pipe. When the pressure of the medium in the container rises, the two overpressure release devices 3 are pushed to move toward a portion close to each other, so that the medium enters the first outlet end 2 from the overpressure release device 3, and then the medium is 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 previous medium pushes the overpressure release device 3 to move, the overpressure release 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 release device 3, the overpressure release device 3 will release the pressure, so that the two overpressure release devices 3 move toward a portion away from each other, and the process of releasing the medium in the container through the first outlet end 2 is interrupted;

[0028] In the above device, the valve assembly 6 is in a state of gravity balance under normal circumstances. When the overpressure release device 3 is closed, a portion of the medium will remain in the first outlet port 2. At this time, the medium will push the valve assembly 6 to swing downward, allowing the medium to flow back into the container. When the medium in the first outlet port 2 ends its backflow, the valve assembly 6 will automatically close.

[0029] Among the above devices, this device mainly realizes the working conditions of overpressure release and medium backflow of the medium, ensuring that the valve can operate normally under low pressure and low flow.

[0030] Further, in order to achieve the purpose of pushing the overpressure release device 3 to move when the pressure in the container rises, and releasing the medium through the first outlet port 2, refer to Figure 4 and Figure 5 The overpressure release device 3 includes a screw plug 31, which is threadedly connected to the middle side of the upper left end of the housing 1. A sliding hole 34 is opened in the middle of the left end of the housing 1. A sealing mechanism 33 is slidably connected to the middle of the inner cavity of the sliding hole 34. Through holes 32 are opened at the upper and lower parts of the left wall of the sliding hole 34.

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

[0032] Further, the sealing mechanism 33 includes a connecting rod 332, the connecting rod 332 is slidably connected to the middle of the sliding hole 34, the right end of the connecting rod 332 is fixedly connected to the auxiliary valve disc 331, the left part of the outer surface of the connecting rod 332 is sleeved with a spring 333, the left edge of the outer surface of the connecting rod 332 is slidably connected with a retaining ring 334, the left part of the retaining ring 334 is provided with a nut 335, and the nut 335 is threadedly connected to the connecting rod 332;

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

[0034] In the above device, when the pressure of the medium in the container rises, the medium will push the through hole 32 to push the auxiliary valve flap 331 to move to the side close to the middle of the inner cavity of the first outlet end 2. When the auxiliary valve flap 331 moves, the flow between the through hole 32 and the first outlet end 2 will be opened, so that the medium flows from the through hole 32 to the first outlet end 2 to release the pressure.

[0035] In the above device, when the auxiliary valve flap 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 to its original position. The retaining ring 334 drives the nut 335 and the connecting rod 332 to move together. When the connecting rod 332 moves, it will drive the auxiliary valve flap 331 to move back to its original position, so that the auxiliary valve flap 331 closes the through hole 32, disconnects the flow between the through hole 32 and the first outlet port 2, and realizes the pressure release of the medium.

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

[0037] Further, in order to achieve the purpose of reflux of the medium through the valve assembly 6, refer to Figure 6 The valve assembly 6 includes a pin 64, which is fixedly connected to the middle side of the right part of the front wall and the rear wall of the housing 1, and the outer surface of the pin 64 is rotatably connected to a force arm block 63, and the right part of the force arm block 63 is fixedly connected to a counterweight block 65, and the left end of the force arm block 63 is fixedly connected to a main valve flap 62, and the upper end of the main valve flap 62 is fixedly connected to a sealing sheet 61;

[0038] Furthermore, the sealing sheet 61 is in contact with the lower portion of the inner cavity of the first outlet port 2 .

[0039] In the above device, a center of gravity balance is formed between the main valve flap 62 and the counterweight block 65 under normal conditions. When the overpressure release device 3 is closed, part of the medium will remain in the first outlet end 2. At this time, the medium will accumulate on the sealing plate 61, causing the center of gravity balance between the main valve flap 62 and the counterweight block 65 to disappear, so that the main valve flap 62 is swung downward with the pin shaft 64 as the center of the circle through the arm block 63, so that the medium flows to the second outlet end 5, and then flows back from the second outlet end 5 to the container to realize the backflow of the medium. When the backflow of the medium in the first outlet end 2 is completed, the center of gravity balance will be restored between the counterweight block 65 and the main valve flap 62 through the arm block 63, so that the main valve flap 62 covers the first outlet end 2 again to prevent the medium from flowing back.

[0040] In the above device, since the force arms of the main valve flap 62 and the counterweight block 65 are quite different, the counterweight block 65 needs to use 90W-7N I i-3Fe with a relatively large density as the counterweight material.

[0041] In the above device, the main valve flap 62 can better seal the first outlet end 2 through the sealing sheet 61 , thereby improving the sealing performance of the valve assembly 6 .

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A balanced check valve, comprising a housing (1), characterized in that: The upper end of the shell (1) is provided with a first outlet end (2), the lower part of the shell (1) is provided with a second outlet end (5), the lower right end of the shell (1) is fixedly connected to a cabin (4), the middle sides of the upper left and right ends of the shell (1) are symmetrically threadedly connected to an overpressure release device (3), and a valve assembly (6) is installed between the shell (1) and the cabin (4).

2. A balanced check valve according to claim 1, characterized in that: The first outlet port (2) and the second outlet port (5) are communicated with each other.

3. A balanced check valve according to claim 1, characterized in that: The overpressure release device (3) comprises a screw plug (31), the screw plug (31) being threadedly connected to the middle side of the upper left end of the housing (1), a sliding hole (34) being provided in the middle of the left end of the housing (1), a sealing mechanism (33) being slidably connected to the middle of the inner cavity of the sliding hole (34), and through holes (32) being provided at the upper and lower parts of the left wall of the sliding hole (34).

4. A balanced check valve according to claim 3, characterized in that: The two through holes (32) are both communicated with the first outlet end (2).

5. A balanced check valve according to claim 3, characterized in that: The sealing mechanism (33) comprises a connecting rod (332), the connecting rod (332) being slidably connected to the middle of the sliding hole (34), the right end of the connecting rod (332) being fixedly connected to an auxiliary valve flap (331), a spring (333) being sleeved on the left portion of the outer surface of the connecting rod (332), a retaining ring (334) being slidably connected at the left edge of the outer surface of the connecting rod (332), a nut (335) being provided on the left portion of the retaining ring (334), and the nut (335) being threadedly connected to the connecting rod (332).

6. A balanced check valve according to claim 5, characterized in that: The left portion of the spring (333) is connected to the left wall of the sliding hole (34).

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

8. A balanced check valve according to claim 7, characterized in that: The sealing sheet (61) is in contact with the lower part of the inner cavity of the first outlet end (2).

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