Check valve with full open type disc
By designing a fully open valve disc structure and an airbag seal, the problems of insufficient medium flow and poor sealing performance in existing check valves have been solved, achieving full opening of the valve disc and improved sealing performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANHUI TUNXI HIGH PRESSURE VALVE
- Filing Date
- 2023-07-04
- Publication Date
- 2026-04-21
AI Technical Summary
Existing check valves have a small valve disc opening angle, resulting in insufficient medium flow. Furthermore, the valve disc is prone to wear and has poor sealing performance, which can easily lead to medium backflow after prolonged use.
A fully open valve disc structure was designed. Through the switching component and the anti-backflow component, the valve disc is driven to open completely by the water flow pressure, and the airbag seal is used to ensure the sealing when closed and prevent the medium from flowing back.
It enables the valve disc to open completely, increases the medium flow rate, reduces valve disc wear, enhances sealing performance, and prevents medium backflow.
Smart Images
Figure CN116816978B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of valve technology, specifically to a check valve with a fully open valve disc. Background Technology
[0002] A check valve is a type of valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow. It belongs to the category of automatic valves and is also known as a non-return valve, one-way valve, reflux valve, or isolation valve. The valve disc movement is divided into lift-type and swing-type. A lift-type check valve is structurally similar to a gate valve, except it lacks the valve stem that drives the valve disc. The medium flows in from the inlet end (bottom) and flows out from the outlet end (top). When the inlet pressure is greater than the sum of the valve disc's weight and its flow resistance, the valve is opened. Conversely, when the medium flows back, the valve closes. A swing-type check valve has an angled valve disc that can rotate around an axis, and its working principle is similar to that of a lift-type check valve. Check valves are commonly used as foot valves in water pumping devices to prevent backflow. Check valves, when used in combination with gate valves, can provide safety isolation. The disadvantages are high resistance and poor sealing when closed.
[0003] In existing check valves, the valve disc opens under its own weight and the pressure of the medium. Due to the structural limitations of the check valve, the valve disc opening angle is generally small, resulting in the valve disc not being able to open fully. This reduces the amount of medium flowing through the valve, limiting its production capacity. Furthermore, the valve disc collides with the valve body repeatedly when closing and opening under its own weight, which can easily cause wear. If the valve disc repeatedly hits the valve seat, the sealing surface of the valve disc can be damaged, reducing its sealing performance. After prolonged use, the internal parts of the check valve can loosen under the impact of water flow, causing errors when the valve disc closes, making it impossible to align precisely. This results in the valve disc not being able to completely seal after closing, which can easily lead to backflow of the medium. Summary of the Invention
[0004] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the purpose of this invention is to provide a check valve with a fully open valve disc, thereby solving the problem mentioned in the background technology where the valve disc opens under its own weight and medium pressure. Due to the structural limitations of the check valve itself, the valve disc opening angle is generally small, resulting in the valve disc not being able to fully open, thus reducing the amount of medium passing through the valve and limiting production capacity.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a check valve with a fully open valve disc, comprising a valve body, wherein a valve cavity is provided inside the valve body, and an inlet communicating with the valve cavity is provided inside one side of the valve body, and an outlet communicating with the valve cavity is provided inside the other side of the valve body, a sealing assembly is provided at the upper end of the valve cavity, a movable rod is provided inside the valve cavity, a valve disc block is fixedly connected to one end of the movable rod, the valve disc block is located inside one end of the inlet, a switching assembly for opening or closing the valve disc block is provided inside one side of the valve body, and an anti-backflow assembly for sealing the valve disc block is provided inside the valve cavity.
[0006] Preferably, the sealing assembly includes a sealing ring fixedly disposed at the upper end of the valve cavity, a graphite pad fixedly disposed at the top end of the sealing ring, and a valve cover disposed at the top end of the valve body above the graphite pad, and the valve body and the valve cover are fixedly installed by bolts.
[0007] Preferably, the switching assembly includes a water injection channel obliquely opened inside one side of the valve body. A first chamber communicating with the water injection channel is laterally opened inside one side of the valve body. A first piston block is slidably fitted inside the first chamber. A first piston rod penetrating into the valve chamber is fixedly connected to the outer wall of the first piston block. A first spring is sleeved on the outer wall of the first piston rod on one side of the first piston block. One end of the first spring is fixedly connected to the outer wall of the first piston block, and the other end of the first spring is fixedly connected to the inner wall of the first chamber. A connecting ring is fixedly connected to one end of the first piston rod. The connecting ring and the movable rod are slidably connected. A driving structure for driving the movable rod to move longitudinally is provided inside one side of the valve body above the first chamber. A sealing ring is fixedly provided on the outer wall of the first piston block.
[0008] Preferably, the drive structure includes a second chamber longitudinally formed inside the valve body, the second chamber communicating with the first chamber. A second piston block is slidably fitted inside the second chamber. A second piston rod is fixedly connected to the top of the second piston block. A second spring is sleeved on the outer wall of the second piston rod on one side of the second piston block. One end of the second spring is fixedly connected to the outer wall of the second piston block, and the other end is fixedly connected to the inner wall of the second chamber. A movable groove is formed inside the valve body on one side of the second chamber. One end of the second piston rod extends into the movable groove, and a connecting rod slidably fitted with the movable groove is fixedly connected to the outer wall of the second piston rod. The other end of the connecting rod extends into the movable rod, and the connecting rod and the movable rod slide laterally in a sliding fit. A sealing ring is fixedly provided on the outer wall of the second piston block.
[0009] Preferably, the anti-backflow assembly includes an air cylinder fixedly disposed on the inner wall of the valve chamber. Inside the air cylinder is a third piston block that slides within it. A third piston rod, penetrating the outer wall of the air cylinder, is fixedly connected to the outer wall of the third piston block. A third spring is fitted onto the outer wall of the third piston rod on one side of the third piston block. One end of the third spring is fixedly connected to the outer wall of the third piston block, and the other end is fixedly connected to the inner wall of the air cylinder. A push block is fixedly connected to one end of the third piston rod. A flexible hose communicating with the bottom outer wall of the air cylinder is fixedly disposed therewith. An air bladder is fixedly disposed on the outer wall of the valve block. A connecting groove communicating with the air bladder is opened inside the valve block. The other end of the connecting groove communicates with one end of the flexible hose. A sealing ring is fixedly disposed on the outer wall of the third piston block.
[0010] Preferably, the airbag is configured as a ring structure, and the inner wall of the airbag is fixedly attached to the outer wall of the valve block.
[0011] Compared with the prior art, the beneficial effects of the present invention are:
[0012] By setting a switching assembly, the valve disc is fully opened under the action of water flow, increasing the medium throughput. When water flows out to the inlet, it enters the first chamber through the injection channel. Under the pressure of the water, the first piston block drives the first piston rod to move to the right. The first piston rod then drives the connecting ring to move, and the connecting ring drives the movable rod to move, causing the valve disc to move out of the inlet. When the first piston block slides to one side of the second chamber, water flows into the second chamber. Under the pressure of the water, the second piston block drives the second piston rod to move upward. While the connecting rod slides upward in the movable groove, it can also drive the movable rod to slide upward in the connecting ring, causing the valve disc to move upward. When the water flow stops entering the inlet, the valve disc is reset and locked in the inlet under the action of the first and second springs. This avoids the resistance and angle limitation when the valve disc is rotated open, allowing the valve disc to be fully opened. This opening and closing method also reduces the loss generated by the valve disc when opening or closing.
[0013] When the valve disc is closing, the movable rod moves to the left and pushes the push block. The push block then drives the third piston rod to push the third piston block to slide to the left inside the air cylinder. This compresses the gas inside the air cylinder and delivers it to the air bladder through the hose and connecting groove, causing the air bladder to expand and fit against the inner wall of the inlet. When the valve disc is opening, the movable rod moves to the right, and the third piston block returns to its original position and slides under the action of the third spring. This draws the gas inside the air bladder into the air cylinder through the hose and connecting groove, and the air bladder returns to its original shape, making it easier for the valve disc to move out of one end of the inlet, thereby improving the sealing performance when the valve disc is closed.
[0014] Under the impact of water flow, internal parts are prone to loosening, causing the valve disc to make errors when closing and failing to be precisely aligned. However, the expansion of the air bladder against the inner wall of the inlet can align and seal the loose valve disc with the inlet, preventing the backflow of the medium caused by the misalignment of the valve disc. Attached Figure Description
[0015] Figure 1 This is a cross-sectional structural diagram of the present invention;
[0016] Figure 2 This is a top view of the graphite pad of the present invention.
[0017] Figure 3 For the present invention Figure 1 Enlarged view of point A in the image;
[0018] Figure 4 This is a cross-sectional structural diagram of the air cylinder of the present invention;
[0019] Figure 5 This is a schematic cross-sectional view of the valve disc block of the present invention.
[0020] In the diagram: 1. Valve body; 2. Valve chamber; 3. Inlet; 4. Outlet; 5. Sealing ring; 51. Graphite gasket; 52. Valve cover; 6. Water injection channel; 61. First chamber; 62. First piston block; 63. First piston rod; 64. First spring; 65. Connecting ring; 7. Movable rod; 71. Valve disc block; 8. Second chamber; 81. Second piston block; 82. Second piston rod; 83. Second spring; 84. Movable groove; 85. Connecting rod; 9. Air cylinder; 91. Third piston block; 92. Third piston rod; 93. Third spring; 94. Push block; 95. Hose; 96. Airbag; 97. Connecting groove. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] Please see Figure 1-5The present invention provides a technical solution: a check valve with a fully open valve disc, comprising a valve body 1, a valve cavity 2 disposed inside the valve body 1, an inlet 3 communicating with the valve cavity 2 being disposed on one side of the valve body 1, and an outlet 4 communicating with the valve cavity 2 being disposed on the other side of the valve body 1, a sealing assembly being disposed at the upper end of the valve cavity 2, a movable rod 7 being disposed inside the valve cavity 2, a valve disc block 71 being fixedly connected to one end of the movable rod 7, the valve disc block 71 being located inside one end of the inlet 3, a switching assembly for opening or closing the valve disc block 71 being disposed inside one side of the valve body 1, and an anti-backflow assembly for sealing the valve disc block 71 being disposed inside the valve cavity 2.
[0023] The sealing assembly includes a sealing ring 5 fixedly disposed at the upper end of the valve cavity 2, a graphite gasket 51 fixedly disposed at the top end of the sealing ring 5, and a valve cover 52 disposed at the top end of the valve body 1 above the graphite gasket 51. The valve body 1 and the valve cover 52 are fixedly installed by bolts. The valve cover 52 of the check valve is fixedly installed to the valve body 1 by bolts, and the bottom of the valve cover 52 presses against the sealing ring 5 and the graphite gasket 51. The sealing ring 5 can seal the valve cover 52, while the graphite gasket 51 provides a secondary seal for the valve cover 52, which can improve the sealing performance of the check valve.
[0024] The switching assembly includes a water injection channel 6 inclinedly opened inside one side of the valve body 1. A first chamber 61, communicating with the water injection channel 6, is laterally opened inside one side of the valve body 1. A first piston block 62, slidably engaged with the first chamber 61, is disposed inside the first chamber 61. A first piston rod 63, penetrating into the valve cavity 2, is fixedly connected to the outer wall of the first piston block 62. A first spring 64 is sleeved on the outer wall of the first piston rod 63 on one side of the first piston block 62. One end of the first spring 64 is fixedly connected to the outer wall of the first piston block 62, and the other end is fixedly connected to the inner wall of the first chamber 61. A connecting ring 65 is fixedly connected to one end of the first piston rod 63. The connecting ring 65 and the movable rod 7 are slidably connected. A device for driving the movable rod 7 is disposed above the first chamber 61 inside one side of the valve body 1. The longitudinally moving drive structure has a sealing ring fixedly installed on the outer wall of the first piston block 62. Water flows through the water injection channel 6 and enters the first chamber 61. As the water pressure in the first chamber 61 increases, the first piston block 62 slides to the right inside the first chamber 61. Since the elastic force of the first spring 64 is less than the water pressure entering the first chamber 61, the first piston block 62 compresses the first spring 64. The first piston block 62 drives the first piston rod 63 to move to the right, and the first piston rod 63 drives the connecting ring 65 to move to the right. The connecting ring 65 then drives the movable rod 7 to move to the right. The movable rod 7 slides to the right on the outer wall of the connecting rod 85. The movable rod 7 drives the valve disc block 71 to move out of the water inlet 3 and drives the valve disc block 71 to move upward through the drive structure. Thus, the valve disc block 71 is opened and closed through the switch assembly.
[0025] The drive structure includes a second chamber 8 longitudinally formed inside the valve body 1, which communicates with the first chamber 61. A second piston block 81 is slidably fitted inside the second chamber 8. A second piston rod 82 is fixedly connected to the top of the second piston block 81. A second spring 83 is fitted onto the outer wall of the second piston rod 82 on one side of the second piston block 81. One end of the second spring 83 is fixedly connected to the outer wall of the second piston block 81, and the other end is fixedly connected to the inner wall of the second chamber 8. A movable groove 84 is formed inside the valve body 1 on one side of the second chamber 8. One end of the second piston rod 82 extends into the movable groove 84, and a connecting rod 85 is fixedly connected to the outer wall of the second piston rod 82, slidably fitting into the movable groove 84. The other end of the rod passes through the interior of the movable rod 7, and the connecting rod 85 slides laterally with the movable rod 7. A sealing ring is fixedly provided on the outer wall of the second piston block 81. When the first piston block 62 slides to one side of the port of the second chamber 8, water is delivered into the second chamber 8. As the water pressure in the second chamber 8 increases, the second piston block 81 slides upward in the second chamber 8. Since the elastic force of the second spring 83 is less than the water pressure input to the second chamber 8, the second piston block 81 drives the second piston rod 82 to move upward and squeeze the second spring 83. The second piston rod 82 then drives the connecting rod 85 to slide upward in the movable groove 84. The connecting rod 85 drives the movable rod 7 to slide upward inside the connecting ring 65. The movable rod 7 then drives the valve disc block 71 to move upward, that is, drives the valve disc block 71 to move upward.
[0026] The anti-backflow assembly includes an air cylinder 9 fixedly mounted on the inner wall of the valve chamber 2. Inside the air cylinder 9 is a third piston block 91 that slides within it. A third piston rod 92, penetrating the outer wall of the air cylinder 9, is fixedly connected to the outer wall of the third piston block 91. A third spring 93 is fitted onto the outer wall of the third piston rod 92 on one side of the third piston block 91. One end of the third spring 93 is fixedly connected to the outer wall of the third piston block 91, and the other end is fixedly connected to the inner wall of the air cylinder 9. One end of the plunger 92 is fixedly connected to a push block 94. A hose 95 communicating with the bottom outer wall of the air cylinder 9 is fixedly installed. An air bladder 96 is fixedly installed on the outer wall of the valve block 71. A connecting groove 97 communicating with the air bladder 96 is opened inside the valve block 71. The other end of the connecting groove 97 is connected to one end of the hose 95. A sealing ring is fixedly installed on the outer wall of the third piston block 91. When the valve block 71 is closed, the movable rod 7 moves to the left and pushes the push block 94, which in turn drives the third piston. As rod 92 slides to the left, the force of the third spring 93 is less than that of the first spring 64. The third piston rod 92 drives the third piston block 91 to slide to the left within the air cylinder 9, and the third piston block 91 pulls the third spring 93. The third piston block 91 compresses the air within the air cylinder 9 and delivers it through the hose 95 and connecting groove 97 to the air bladder 96. The air bladder 96 then expands and adheres to the inner wall of the water inlet 3, achieving a seal after the valve disc 71 closes. Simultaneously, under the impact of the water flow, internal parts are easily... Looseness causes the valve disc 71 to have errors when closing, making it impossible to align precisely. When the air bladder 96 inflates, it presses against the inner wall of the water inlet 3, which can align and seal the loose valve disc 71 with the water inlet 3, preventing backflow of the medium after the valve disc 71 is misaligned. When the valve disc 71 is opened, the movable rod 7 moves to the right, and the third spring 93 restores its deformation and pushes the third piston block 91 to slide to the right in the air cylinder 9, which can draw the air in the air bladder 96 into the air cylinder 9, thus facilitating the quick removal of the valve disc 71.
[0027] The airbag 96 is designed as a ring structure, and the inner wall of the airbag 96 is fixedly attached to the outer wall of the valve disc block 71, so that the airbag 96 can seal the valve disc block 71 stuck in the water inlet 3 after it is inflated.
[0028] Working principle: When using this check valve with a fully open valve disc, firstly, under constant water pressure, water flows into inlet 3. At this time, the water flows through the water injection channel 6 and into the first chamber 61. As the water pressure in the first chamber 61 increases, the first piston block 62 slides to the right inside the first chamber 61. Since the elastic force of the first spring 64 is less than the water pressure entering the first chamber 61, the first piston block 62 compresses the first spring 64. The first piston block 62 drives the first piston rod 63 to move to the right, and the first piston rod 63 drives the connecting ring 65 to move to the right. The connecting ring 65 then drives the movable rod. 7 moves to the right, and the movable rod 7 slides to the right on the outer wall of the connecting rod 85. The movable rod 7 drives the valve disc block 71 to move out of the inlet 3, and the water flow is delivered to the valve chamber 2 through the inlet 3 and output through the outlet 4. When the first piston block 62 slides to one side of the port of the second chamber 8, the water flow is delivered to the second chamber 8. As the water pressure in the second chamber 8 increases, the second piston block 81 slides upward in the second chamber 8. Since the elastic force of the second spring 83 is less than the water pressure input to the second chamber 8, the second piston block 81 drives the second piston rod 82 to move upward and squeeze the second spring 83. This causes the connecting rod 85 to slide upward within the movable groove 84. The connecting rod 85 then causes the movable rod 7 to slide upward within the connecting ring 65. The movable rod 7 then causes the valve disc block 71 to move upward. At this time, the valve disc block 71 moves above the inlet 3 and does not resist the water flow at the inlet 3, allowing the valve disc block 71 to fully open and increasing the medium throughput. When the output water flow at the inlet 3 is closed, since the elastic force of the first spring 64 is less than the elastic force of the second spring 83, the water pressure in the second chamber 8 is less than the elastic force of the second spring 83. The second spring 83 then resets and pushes the second piston block 81 in the second chamber. The first piston block 81 slides downward within chamber 8, while the second piston block 81 drives the movable rod 7 to slide downward within the connecting ring 65 via the connecting rod 85. At the same time, the first spring 64 resets and pushes the first piston block 62 to slide to the left within the first chamber 61. The first piston block 62 then pulls the connecting ring 65 to the right via the first piston rod 63. The connecting ring 65 drives the valve disc 71 to engage with the inlet 3 via the movable rod 7. Through the combined use of the first spring 64, the second spring 83, and water pressure, the valve disc 71 opens and closes quickly, preventing backflow of the medium when the valve disc 71 closes due to its own gravity.
[0029] Then, when valve disc 71 closes, movable rod 7 moves to the left, and movable rod 7 pushes push block 94. Push block 94 then drives third piston rod 92 to slide to the left. Since the elastic force of third spring 93 is less than that of first spring 64, third piston rod 92 drives third piston block 91 to slide to the left inside air cylinder 9. Third piston block 91 pulls third spring 93, and third piston block 91 compresses the air inside air cylinder 9 and delivers it to airbag 96 through hose 95 and connecting groove 97. Airbag 96 then expands and fits against the inner wall of water inlet 3, achieving a seal after valve disc 71 closes. At the same time, under the impact of water flow, internal parts... The valve disc 71 is prone to loosening, which can cause errors when it is closed and make it impossible to align precisely. When the air bladder 96 inflates, it presses against the inner wall of the inlet 3, which can align and seal the loose valve disc 71 with the inlet 3, preventing backflow of the medium after the valve disc 71 is misaligned. When the valve disc 71 is opened, the movable rod 7 moves to the right, and the third spring 93 restores its deformation and pushes the third piston block 91 to slide to the right in the air cylinder 9, which can draw the air in the air bladder 96 into the air cylinder 9, thus facilitating the quick removal of the valve disc 71. This structure can not only improve the closing and sealing performance of the valve disc 71, but also prevent backflow of the medium due to misalignment of the valve disc 71.
[0030] Finally, the valve cover 52 of the check valve is fixedly installed to the valve body 1 by bolts, and the bottom of the valve cover 52 is pressed to form a sealing ring 5 and a graphite gasket 51. The sealing ring 5 can seal the valve cover 52, while the graphite gasket 51 provides a secondary seal for the valve cover 52, which can improve the sealing performance of the check valve.
[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A check valve with a full-open type disc, comprising a valve body (1), characterized in that: The valve body (1) has a valve cavity (2) inside, and an inlet (3) communicating with the valve cavity (2) is opened on one side of the valve body (1), and an outlet (4) communicating with the valve cavity (2) is opened on the other side of the valve body (1). A sealing assembly is provided at the upper end of the valve cavity (2), and a movable rod (7) is provided inside the valve cavity (2). A valve disc block (71) is fixedly connected to one end of the movable rod (7). The valve disc block (71) is located inside one end of the inlet (3). A switch assembly for opening or closing the valve disc block (71) is provided inside one side of the valve body (1), and an anti-backflow assembly for sealing the valve disc block (71) is provided inside the valve cavity (2). The switching assembly includes a water injection channel (6) inclinedly opened inside one side of the valve body (1). A first chamber (61) communicating with the water injection channel (6) is laterally opened inside one side of the valve body (1). A first piston block (62) is provided inside the first chamber (61) and slides therewith. A first piston rod (63) penetrating into the valve cavity (2) is fixedly connected to the outer wall of the first piston block (62). A first spring (64) is sleeved on the outer wall of the first piston rod (63) on one side of the first piston block (62). One end of the first spring (64) is fixedly connected to the outer wall of the first piston block (62), and the other end of the first spring (64) is fixedly connected to the inner wall of the first chamber (61). One end of the first piston rod (63) is fixedly connected to a connecting ring (65). The connecting ring (65) and the movable rod (7) are configured to slide together. A driving structure for driving the movable rod (7) to move longitudinally is provided on one side of the valve body (1) above the first chamber (61). A sealing ring is fixedly provided on the outer wall of the first piston block (62). The drive structure includes a second chamber (8) longitudinally formed inside the valve body (1), which communicates with the first chamber (61). A second piston block (81) is slidably fitted inside the second chamber (8). A second piston rod (82) is fixedly connected to the top of the second piston block (81). A second spring (83) is sleeved on the outer wall of the second piston rod (82) on one side of the second piston block (81). One end of the second spring (83) is fixedly connected to the outer wall of the second piston block (81), and the second spring (83)... The other end of the valve body (1) is fixedly connected to the inner wall of the second chamber (8). The valve body (1) has a movable groove (84) on one side of the second chamber (8). One end of the second piston rod (82) passes through the interior of the movable groove (84), and the outer wall of the second piston rod (82) is fixedly connected to a connecting rod (85) that slides with the movable groove (84). The other end of the connecting rod (85) passes through the interior of the movable rod (7), and the connecting rod (85) slides laterally with the movable rod (7). A sealing ring is fixedly provided on the outer wall of the second piston block (81). The anti-backflow assembly includes an air cylinder (9) fixedly installed on the inner wall of the valve chamber (2). Inside the air cylinder (9) is a third piston block (91) that slides in cooperation with it. A third piston rod (92) that penetrates the outer wall of the air cylinder (9) is fixedly connected to the outer wall of the third piston block (91). A third spring (93) is sleeved on the outer wall of the third piston rod (92) on one side of the third piston block (91). One end of the third spring (93) is fixedly connected to the outer wall of the third piston block (91). The other end is fixedly connected to the inner wall of the air cylinder (9). One end of the third piston rod (92) is fixedly connected to a push block (94). The bottom outer wall of the air cylinder (9) is fixedly provided with a hose (95) communicating with it. The outer wall of the valve block (71) is fixedly provided with an airbag (96). The valve block (71) has a connecting groove (97) communicating with the airbag (96) inside. The other end of the connecting groove (97) is connected to one end of the hose (95). The outer wall of the third piston block (91) is fixedly provided with a sealing ring.
2. A check valve having a full-opening disc according to claim 1, characterized in that: The sealing assembly includes a sealing ring (5) fixedly disposed on the upper end of the valve cavity (2), a graphite pad (51) fixedly disposed on the top end of the sealing ring (5), and a valve cover (52) disposed on the top end of the valve body (1) above the graphite pad (51). The valve body (1) and the valve cover (52) are fixedly installed by bolts.
3. A check valve having a full-open type disc according to claim 1, characterized in that: The airbag (96) is configured as a ring structure, and the inner wall of the airbag (96) is fixedly attached to the outer wall of the valve block (71).
Citation Information
Patent Citations
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