Check valve with adjustable opening degree

Abstract

The check valve comprises a valve body, an input port is formed in the left portion of the valve body, an output port is formed in the right end of the valve body, a cavity is formed in the middle of the valve body, a valve deck is connected to the upper end of the valve body through a bolt, and an adjusting assembly is slidably connected to the upper portion of an inner cavity of the valve deck. The lower portion of an inner cavity of the valve deck is slidably connected with a non-return device, the lower portion of the adjusting assembly and the upper portion of the non-return device are jointly and fixedly connected with a tension spring, the upper portion of the inner cavity of the valve deck is slidably connected with a gland, and an inner cavity of the gland is rotatably connected with a valve rod nut. According to the check valve with the adjustable opening degree, through the designed check device, fluid backflow can be effectively prevented, equipment can be protected against damage caused by backflow, the safety and stability of the equipment are improved, under the action of the tension spring, the check device is passively closed, and the opening degree of the check valve can be adjusted. The non-return device can be quickly closed to prevent fluid from flowing back.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a check valve with adjustable opening. Background Art

[0002] A check valve, also known as a non-return valve, one-way valve, reflux valve or isolation valve, is a valve whose opening and closing part (valve disc) is round and which relies on its own weight and medium pressure to produce a movement to block the backflow of the medium.

[0003] At present, most of the check valves used in the market are switch type valves. When the valve inlet flow is small, the weight of the valve disc itself may cause it to be unable to open. Or when the inlet flow is constant, the valve disc opening height is small or large, so a check valve with adjustable opening is needed. Summary of the invention

[0004] The main purpose of the present invention is to provide a check valve with adjustable opening, 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 check valve with adjustable opening comprises a valve body, an input port is provided on the left side of the valve body, an output port is provided on the right end of the valve body, a hollow chamber is provided in the middle part of the valve body, a valve cover is bolted to the upper end of the valve body, an adjusting component is slidably connected to the upper part of the inner cavity of the valve cover, a check device is slidably connected to the lower part of the inner cavity of the valve cover, a tension spring is fixedly connected to the lower part of the adjusting component and the upper part of the check device, a pressure cover is slidably connected to the upper part of the inner cavity of the valve cover, a valve stem nut is rotatably connected to the inner cavity of the pressure cover, a locking nut is threadedly connected to the upper part of the outer surface of the valve stem nut, and a bearing is arranged between the outer ring of the lower end of the valve stem nut and the bottom wall of the valve cover.

[0007] Preferably, the valve stem nut is threadedly connected to the adjusting assembly.

[0008] Preferably, the input port is communicated with the hollow chamber, and the hollow chamber is communicated with the output port.

[0009] Preferably, the check device includes a valve flap and an O-ring 1, the valve flap slides in the lower part of the inner cavity of the valve cover, the lower end of the valve flap is slidably connected to a sealing ring, the lower end of the sealing ring is slidably connected to a pressure ring, the middle part of the pressure ring is threaded with a bolt, the lower part of the outer surface of the pressure cover is slidably connected to a stop washer, and the O-ring 1 is located at the upper end of the sealing ring and connected to the valve flap.

[0010] Preferably, the bolt passes through the middle portion of the lower end of the sealing ring and extends into the interior of the valve disc, and the bolt is threadedly connected to the valve disc.

[0011] Preferably, the outer ring at the upper end of the valve disc is fixedly connected to the tension spring.

[0012] Preferably, the adjusting assembly includes an adjusting valve stem, which is threadedly connected to the inner cavity of the valve stem nut, the upper part of the outer surface of the adjusting valve stem is plated with scale lines, the lower part of the outer surface of the adjusting valve stem is fixedly connected to a sliding sleeve, and the upper and lower parts of the outer surface of the sliding sleeve are fixedly connected to O-ring 2.

[0013] Preferably, the sliding sleeve is slidably connected to the upper part of the inner cavity of the valve cover, and the outer ring of the lower end of the regulating valve stem is fixedly connected to the tension spring.

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

[0015] 1. The device can adjust the size of the opening of the check device through the designed adjustment component, thereby controlling the flow rate of the fluid passing through, so that the user can adjust the opening of the check device according to actual conditions to meet specific flow and pressure requirements.

[0016] 2. The device is designed with a check device that can effectively prevent fluid backflow, help protect the equipment from damage caused by backflow, and improve the safety and stability of the equipment. Under the action of the tension spring, the check device can be closed passively, and the check device can be quickly closed to prevent fluid backflow, further improving the safety and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 It is a plan view of the overall structure of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the non-return device of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the regulating component of the present invention.

[0022] The markings in the figure are: 1. valve body; 2. input port; 3. cavity chamber; 4. valve cover; 5. pressure cover; 6. locking nut; 7. adjusting assembly; 8. output port; 9. check device; 10. valve stem nut; 11. tension spring; 12. bearing; 91. valve disc; 92. O-ring one; 93. sealing ring; 94. pressure ring; 95. bolt; 96. stop washer; 71. scale line; 72. adjusting valve stem; 73. sliding sleeve; 74. O-ring two. 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] Embodiment 1

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, a check valve with adjustable opening comprises a valve body 1, an input port 2 is provided at the left part of the valve body 1, an output port 8 is provided at the right end of the valve body 1, a hollow chamber 3 is provided at the middle part of the valve body 1, a valve cover 4 is bolted to the upper end of the valve body 1, an adjusting component 7 is slidably connected to the upper part of the inner cavity of the valve cover 4, a check device 9 is slidably connected to the lower part of the inner cavity of the valve cover 4, a tension spring 11 is fixedly connected to the lower part of the adjusting component 7 and the upper part of the check device 9, a pressure cap 5 is slidably connected to the upper part of the inner cavity of the valve cover 4, a valve stem nut 10 is rotatably connected to the inner cavity of the pressure cap 5, a locking nut 6 is threadedly connected to the upper part of the outer surface of the valve stem nut 10, and a bearing 12 is arranged between the outer ring of the lower end of the valve stem nut 10 and the bottom wall of the valve cover 4;

[0026] Further, the valve stem nut 10 is threadedly connected to the adjustment assembly 7;

[0027] Furthermore, the input port 2 is communicated with the hollow chamber 3 , and the hollow chamber 3 is communicated with the output port 8 .

[0028] This device is mainly used in nuclear power plants to prevent the backflow of medium in nuclear power plant pipelines and reduce the impact caused by water hammer effect.

[0029] Before the implementation of this device, the installation steps are as follows:

[0030] First, place the check device 9, the tension spring 11 and the adjusting component 7 in the inner cavity of the valve cover 4, and then combine the valve cover 4, the check device 9, the tension spring 11 and the adjusting component 7 and place them on the upper end of the valve body 1. After placement, connect them with bolts, and then place the bearing 12 into the inside of the valve cover 4. Then, screw the valve stem nut 10 into the inner cavity of the valve cover 4 through the threaded connection with the adjusting component 7, and the lower end of the valve stem nut 10 fits with the bearing 12. Then place the pressure cover 5 into the inner cavity of the valve cover 4, and the inner cavity of the pressure cover 5 fits with the valve stem nut 10. After placement, connect the contact surfaces of the valve cover 4 and the pressure cover 5 with screws, fix the valve cover 4 and the pressure cover 5 together, and finally connect the locking nut 6 to the outer surface of the valve stem nut 10, and the installation is completed.

[0031] In the above device, the left and right ends of the valve body 1 are connected to the nuclear power plant pipeline, and the installation position is that the medium enters from the input port 2. After installation, if the flow rate of the medium is to be adjusted, the locking nut 6 can be removed first, and then the valve stem nut 10 can be rotated by a wrench. The upper part of the valve stem nut 10 is a square head, so that the valve stem nut 10 can be driven to rotate by rotating the wrench. When the valve stem nut 10 rotates, the adjusting component 7 is driven to move upward through the threaded connection with the adjusting component 7. When the adjusting component 7 moves upward, the check device 9 is driven to move upward through the tension spring 11. When the check device 9 moves upward, the outer ring of the check device 9 cannot contact the lower end of the valve cover 4;

[0032] It should be noted that the tension of the tension spring 11 must be greater than the sum of the gravity of the check device 9 and the friction generated by the check device 9 and the valve cover 4. When the adjustment component 7 moves upward, the check device 9 is driven upward by the tension spring 11, otherwise the check device 9 will remain stationary.

[0033] The specific implementation is as follows:

[0034] When the medium enters from the input port 2, it will enter the cavity 3 through the downward inclined hole design of the valve body 1, and then flow from the cavity 3 into the output port 8, and then flow out from the output port 8;

[0035] When the medium flows back, it will flow into the upper part of the inner cavity of the cavity 3 through the upward inclined hole design of the output port 8, and then accumulate on the upper part of the non-return device 9. The pressure of the medium plus the gravity of the non-return device 9 will drive the non-return device 9 to move downward, so that the non-return device 9 closes the cavity 3, so that the medium will not flow back into the input port 2, thereby playing a non-return role.

[0036] In the above device, when the medium presses the check device 9 to move downward, the tension spring 11 will generate a pulling force. When the medium refluxes, the pressure applied by the medium to the check device 9 will disappear, and the tension spring 11 will release the pressure. At the same time as the medium enters from the input port 2, the check device 9 will move upward to its original position, allowing the medium to flow from the cavity 3 to the output port 8 and then flow out from the output port 8.

[0037] In the above device, the bearing 12 is used to facilitate the rotation of the valve stem nut 10, thereby achieving easy operation.

[0038] In the above device, a gasket is provided between the valve cover 4 and the valve body 1, and the gasket is used to seal the matching seal between the valve body 1 and the valve cover 4 to prevent the medium from leaking out.

[0039] In the above device, the locking nut 6 is used to lock the valve stem nut 10 to prevent the original valve opening from changing due to vibration or misoperation when the valve is switched to a desired opening.

[0040] Embodiment 2

[0041] Further, in order to achieve the purpose of the non-return device 9 to play a non-return role, refer to Figure 4 The check device 9 includes a valve flap 91 and an O-ring 92. The valve flap 91 slides on the lower part of the inner cavity of the valve cover 4. The lower end of the valve flap 91 is slidably connected to a sealing ring 93. The lower end of the sealing ring 93 is slidably connected to a pressure ring 94. The middle part of the pressure ring 94 is threadedly connected to a bolt 95. The lower part of the outer surface of the pressure cover 5 is slidably connected to a stop washer 96. The O-ring 92 is located at the upper end of the sealing ring 93 and is connected to the valve flap 91.

[0042] Furthermore, the bolt 95 passes through the middle of the lower end of the sealing ring 93 and extends into the valve disc 91, and the bolt 95 is threadedly connected to the valve disc 91;

[0043] Furthermore, the outer ring of the upper end of the valve flap 91 is fixedly connected to the tension spring 11 .

[0044] In the above device, the installation steps of the non-return device 9 are as follows:

[0045] Place the sealing ring 93 in the inner cavity at the lower end of the valve disc 91, then place the pressure ring 94 in the inner cavity of the sealing ring 93, and then screw the bolt 95 into the pressure ring 94 and the valve disc 91 to fix the sealing ring 93 in the inner cavity at the lower end of the valve disc 91 through the pressure ring 94 and the bolt 95.

[0046] In the above device, the locking washer 96 is used to prevent loosening.

[0047] In the above device, the O-ring 92 is used for sealing the ring 93 and the valve disc 91 to prevent the medium from leaking inside.

[0048] In the above device, when the medium flows back, the medium will press the valve flap 91 to move downward, so that the valve flap 91 closes the flow between the output port 8 and the cavity 3, thereby achieving a check function.

[0049] Further, in order to realize the purpose of rotating the valve stem nut 10, the adjusting assembly 7 moves upward, and the check device 9 moves upward by the tension spring 11, refer to Figure 5 The regulating assembly 7 includes a regulating valve stem 72, which is threadedly connected to the inner cavity of the valve stem nut 10, and a scale line 71 is plated on the upper part of the outer surface of the regulating valve stem 72, and a sliding sleeve 73 is fixedly connected to the lower part of the outer surface of the regulating valve stem 72, and an O-ring 74 is fixedly connected to the upper and lower parts of the outer surface of the sliding sleeve 73;

[0050] Furthermore, the sliding sleeve 73 is slidably connected to the upper part of the inner cavity of the valve cover 4 , and the outer ring of the lower end of the regulating valve stem 72 is fixedly connected to the tension spring 11 .

[0051] In the above device, before rotating the valve stem nut 10, the locking nut 6 must be removed first, and then the valve stem nut 10 is rotated. The valve stem nut 10 is threadedly connected with the regulating valve stem 72, and the regulating valve stem 72 will move upward, sliding upward in the inner cavity of the valve cover 4 through the sliding sleeve 73. When the regulating valve stem 72 moves upward, the check device 9 is driven upward by the tension spring 11, thereby achieving the purpose of adjusting the flow size of the medium.

[0052] In the above device, the O-ring 2 74 is used to adjust the sealing between the valve stem 72 and the valve cover 4 to prevent the medium from leaking to the outside.

[0053] In the above device, the opening and closing status of the valve can be observed by observing the scale line 71, so that the number of turns of the valve stem nut 10 can be determined according to the scale line 71 according to the required adjustment height.

[0054] 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 check valve with adjustable opening, comprising a valve body (1), characterized in that: The valve body (1) is provided with an input port (2) at the left side, and an output port (8) at the right side. The valve body (1) is provided with a hollow chamber (3) in the middle. The upper end of the valve body (1) is bolted to a valve cover (4). The upper part of the inner cavity of the valve cover (4) is slidably connected to an adjusting component (7). The lower part of the inner cavity of the valve cover (4) is slidably connected to a check device (9). The lower part of the adjusting component (7) and the upper part of the check device (9) are fixedly connected to a tension spring (11). The upper part of the inner cavity of the valve cover (4) is slidably connected to a pressure cover (5). The inner cavity of the pressure cover (5) is rotatably connected to a valve stem nut (10). The upper part of the outer surface of the valve stem nut (10) is threadedly connected to a locking nut (6). A bearing (12) is provided between the outer ring of the lower end of the valve stem nut (10) and the bottom wall of the valve cover (4).

2. The check valve with adjustable opening according to claim 1, characterized in that: The valve stem nut (10) is threadedly connected to the adjustment assembly (7).

3. The check valve with adjustable opening according to claim 1, characterized in that: The input port (2) is in communication with the hollow chamber (3), and the hollow chamber (3) is in communication with the output port (8).

4. The check valve with adjustable opening according to claim 1, characterized in that: The non-return device (9) comprises a valve flap (91) and an O-ring (92); the valve flap (91) slides on the lower part of the inner cavity of the valve cover (4); the lower end of the valve flap (91) is slidably connected to a sealing ring (93); the lower end of the sealing ring (93) is slidably connected to a pressure ring (94); a bolt (95) is threadedly connected to the middle part of the pressure ring (94); a stop washer (96) is slidably connected to the lower part of the outer surface of the pressure cover (5); the O-ring (92) is located at the upper end of the sealing ring (93) and is connected to the valve flap (91).

5. The check valve with adjustable opening according to claim 2, characterized in that: The bolt (95) passes through the middle of the lower end of the sealing ring (93) and extends into the interior of the valve flap (91), and the bolt (95) is threadedly connected to the valve flap (91).

6. The check valve with adjustable opening according to claim 2, characterized in that: The outer ring at the upper end of the valve flap (91) is fixedly connected to the tension spring (11).

7. The check valve with adjustable opening according to claim 1, characterized in that: The regulating assembly (7) comprises a regulating valve stem (72), wherein the regulating valve stem (72) is threadedly connected to the inner cavity of the valve stem nut (10), the upper portion of the outer surface of the regulating valve stem (72) is plated with a scale line (71), the lower portion of the outer surface of the regulating valve stem (72) is fixedly connected to a sliding sleeve (73), and the upper and lower portions of the outer surface of the sliding sleeve (73) are fixedly connected to an O-ring 2 (74).

8. The check valve with adjustable opening according to claim 7, characterized in that: The sliding sleeve (73) is slidably connected to the upper part of the inner cavity of the valve cover (4), and the outer ring of the lower end of the regulating valve stem (72) is fixedly connected to the tension spring (11).

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