Bypass check valve

Abstract

The utility model provides a bypass check valve which comprises a valve body, a valve port passive opening and closing assembly and a control port active opening and closing assembly. A valve cavity, a control cavity and a bypass channel are formed in the valve body, a valve port is formed in one end of the valve cavity, the bypass channel is communicated with the valve port and the control cavity, a control port is arranged at one end of the control cavity, and the control port is connected into the valve cavity from the downstream of the valve port; the valve port passive opening and closing assembly is connected to the valve body so as to open or close the valve port; the control port active opening and closing assembly is connected to the valve body and used for opening or closing the control port. The water hammer pressure is eliminated by adopting low-cost and high-integration parts, and a pipeline system is protected.

Description

Technical Field

[0001] The utility model relates to a check valve, in particular to a bypass check valve. Background Art

[0002] A check valve is a valve that automatically opens and closes the valve disc based on the flow of the medium itself to prevent the medium from flowing back.

[0003] Since the check valve and bypass valve are separate, when the water pump stops, the pressure upstream of the check valve suddenly increases, causing a water hammer effect. A bypass valve is required to relieve the pressure, which requires additional piping systems and valves, increasing the cost of the piping system and the complexity of the layout.

[0004] Or when the bypass valve is not used, the water hammer effect will damage the check valve, or in cold weather the medium in the pipeline cannot be discharged, causing the pipeline to freeze and damage the pipeline system.

[0005] Therefore, a bypass check valve with a simple structure and convenient pipeline layout is needed to eliminate water hammer pressure and protect the pipeline system. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the technical solution adopted by the utility model is: a bypass check valve, comprising

[0007] A valve body, wherein a valve cavity, a control cavity and a bypass channel are provided in the valve body, a valve port is provided at one end of the valve cavity, the bypass channel is connected to the valve port and the control cavity respectively, and one end of the control cavity is configured as a control port, and the control port is connected to the valve cavity downstream of the valve port;

[0008] The valve port passive opening and closing component is connected to the valve body to realize the opening or closing of the valve port;

[0009] The control port active opening and closing component is connected to the valve body and is used to open or close the control port.

[0010] Furthermore, the valve port passive opening and closing assembly includes a valve plate, a valve stem, and a torsion spring. Both ends of the valve stem are fixedly connected to the valve body. The valve plate is rotatably arranged on the valve stem. The torsion spring elastically connects the valve plate and the valve stem.

[0011] When the medium pressure acts on the valve plate, the valve plate rotates around the valve stem to open the valve port, and the elastic force of the torsion spring increases;

[0012] When the medium pressure does not act on the valve plate, the valve plate is pressed against the valve seat of the valve body under the elastic force of the torsion spring, so that the valve port is closed.

[0013] Furthermore, the valve plates and torsion springs are provided in pairs, the two valve plates are respectively sleeved on the valve stem and can rotate towards each other, and the two torsion springs are respectively sleeved on the valve stem;

[0014] A positioning column is provided on the valve cavity parallel to the valve stem. One leg of the torsion spring hooks the positioning column, and the other leg of the torsion spring abuts against the surface of the valve plate.

[0015] Furthermore, the control port active opening and closing component includes a compression sleeve, a valve shaft, and a connecting sleeve. The connecting sleeve is arranged on the side of the valve body, and the valve shaft is threadedly connected to the connecting sleeve. One end of the valve shaft extends into the control cavity and is connected to the compression sleeve. The compression sleeve can approach or move away from the control port as the valve shaft rotates to realize the opening or closing of the control port.

[0016] Furthermore, a sealing ring is provided on one side of the pressing sleeve close to the control port, and the sealing ring is fixed to the pressing sleeve through a pressing sleeve nut, and the sealing ring is used to seal the control port.

[0017] Furthermore, a gasket is provided between the shaft shoulder of the connecting sleeve and the side surface of the valve body.

[0018] Furthermore, one end of the compression sleeve away from the valve body is threadedly connected to the nut, the valve shaft passes through the nut, a packing is provided in the compression sleeve on one side close to the nut, and a packing gland is provided between the packing and the nut.

[0019] Furthermore, a handwheel is fixedly provided on one end of the valve shaft away from the compression sleeve via a handwheel nut, and an indicator sign is provided on the surface of the handwheel.

[0020] The advantages of the utility model are: a bypass channel is added, the structure of the switch valve is combined with the structure of the check valve to realize the bypass function of the check valve. The two valves share a valve body, and the water hammer pressure generated upstream of the check valve is unloaded without increasing the number of new valves and changing the layout of the piping system, thereby avoiding freezing of the medium upstream of the check valve, and using low-cost, highly integrated components to protect the piping system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a planar sectional view of the present utility model.

[0022] Figure 2 It is a top view of the utility model.

[0023] In the figure: 1-valve body, 101-valve chamber, 102-valve port, 103-control chamber, 104-bypass channel, 105-control port, 106-valve seat, 2-valve plate, 3-valve stem, 4-torsion spring, 5-pressing nut, 6-pressing sleeve, 7-sealing ring, 8-valve shaft, 9-washer, 10-connecting sleeve, 11-packing, 12-nut, 13-packing gland, 14-handwheel, 15-indicator plate, 16-handwheel nut, a-first axis, b-second axis, c-third axis. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Please see the attached Figure 1-2 The utility model provides a bypass check valve, including a valve body 1, a valve port passive opening and closing component, and a control port active opening and closing component; the valve body 1 is provided with a valve cavity 101, a control cavity 103 and a bypass channel 104, one end of the valve cavity 101 is provided with a valve port 102, the bypass channel 104 is respectively connected to the valve port 102 and the control cavity 103, one end of the control cavity 103 is configured as a control port 105, and the control port 105 is connected to the valve cavity 101 downstream of the valve port 102; the valve port passive opening and closing component is connected to the valve body 1 to realize the opening or closing of the valve port 102; the control port active opening and closing component is connected to the valve body 1, and is used to open or close the control port 105.

[0026] Specifically, after the bypass check valve is installed on the pipeline, the front end face of the valve body 1 is connected to the upstream pipeline, and the rear end face of the valve body 1 is connected to the downstream pipeline. In the initial state, the valve port 102 is open and the control port 105 is closed; when the medium in the pipeline flows normally, the valve port passive opening and closing component is pushed open by the medium pressure, the valve port 102 opens, and the control port active opening and closing component actively closes the control port 105, and the medium flows from the upstream of the valve body 1 to the downstream of the valve body 1 through the valve cavity 101; when the water pump suddenly stops, the medium pressure suddenly drops, the valve port passive opening and closing component passively closes the valve port 102, and the control port active opening and closing component opens the control port 105, and the medium enters the valve cavity 101 from the bypass channel 104 and the control cavity 103, eliminating the water hammer effect and releasing the pressure to the downstream of the valve body 1.

[0027] In the present application, the valve port passive opening and closing assembly includes a valve plate 2, a valve stem 3, and a torsion spring 4. The two ends of the valve stem 3 are respectively fixedly connected to the valve body 1. The valve plate 2 is rotatably set on the valve stem 3, and the torsion spring 4 elastically connects the valve plate 2 and the valve stem 3; when the medium pressure acts on the valve plate 2, the valve plate 2 rotates around the valve stem 3 to open the valve port 102, and the elastic force of the torsion spring 4 increases; when the medium pressure does not act on the valve plate 2, the valve plate 2 is tightly attached to the valve seat 106 of the valve body 1 under the elastic force of the torsion spring 4, so that the valve port 102 is closed.

[0028] In a specific embodiment, the first axis a where the valve cavity 101 is located is along the front-to-back direction, and the second axis c where the valve stem 3 is located is along the up-down direction. By utilizing the characteristic that the medium pressure is greater than the torque of the torsion spring 4, the valve plate 2 is rotated and opened toward the downstream of the valve body 1, thereby realizing the passive opening of the passive opening and closing component of the valve port when the water pump is working; when the medium pressure suddenly drops when the water pump stops, the valve plate 2 rotates in the opposite direction and closes when the torque of the torsion spring 4 is greater than the medium pressure, and under the action of the torsion spring 4, the valve plate 2 is tightly attached to the valve port 102 to seal the valve port 102, thereby realizing the passive closing of the passive opening and closing component of the valve port when the water pump stops.

[0029] In a specific structure, two valve plates 2 and two torsion springs 4 are respectively provided, and the two valve plates 2 are respectively sleeved on the valve stem 3 and can rotate toward each other, and the two torsion springs 4 are respectively sleeved on the valve stem 3; a positioning column is provided on the valve cavity 101 parallel to the valve stem 3, one leg of the torsion spring 4 hooks the positioning column, and the other leg of the torsion spring 4 abuts against the surface of the valve plate 2; the valve plate 2 is a semicircular structure, and the side surfaces of the two valve plates 2 fit together to form a full circle structure. The two valve plates 2 are used to rotate independently on the valve stem 3 to divert the medium along both sides of the valve stem 3 and introduce it into the valve cavity 101.

[0030] In the present application, the control port active opening and closing component includes a pressing sleeve 6, a valve shaft 8, and a connecting sleeve 10. The connecting sleeve 10 is arranged on the side of the valve body 1. The valve shaft 8 is threadedly connected to the connecting sleeve 10. One end of the valve shaft 8 extends into the control chamber 103 and is connected to the pressing sleeve 6. The pressing sleeve 6 can approach or move away from the control port 105 as the valve shaft 8 rotates to realize the opening or closing of the control port 105.

[0031] In a specific embodiment, the second axis b where the valve shaft 8 is located is along the left-right direction, and the connecting sleeve 10 is tightly fitted or threadedly connected to the right side of the valve body 1. The valve shaft 8 is rotated to drive the pressing sleeve 6 to move closer to or away from the control port 105 to achieve the purpose of opening or closing the control port 105.

[0032] Furthermore, in order to achieve a better sealing effect, a sealing ring 7 is provided on the side of the pressing sleeve 6 close to the control port 105 . The sealing ring 7 is fixed to the pressing sleeve 6 by a pressing sleeve nut 5 . The sealing ring 7 is used to seal the control port 105 .

[0033] When the threaded rod section on the left side of the compression sleeve is threadedly connected to the compression sleeve nut 5, the sealing ring 7 is fixed on the compression sleeve 6. The diameter of the sealing ring 7 is greater than the diameter of the compression sleeve nut 5 and the diameter of the control port 105. When the sealing ring 7 seals and closes the control port 105, it will not affect the movement of the compression sleeve nut 5, thereby avoiding wear and collision of internal parts of the valve body 1 caused by movement interference;

[0034] In the initial state, the control port 105 needs to be kept closed. At this time, the valve shaft 8 is rotated to drive the compression sleeve 6 to approach the control port 105 until the sealing ring 7 seals the control port 105; when the water hammer pressure needs to be eliminated, the valve shaft 8 is rotated in the opposite direction to open the control port 105.

[0035] In order to improve the sealing performance of the connection between the connecting sleeve 10 and the valve body 1 , a gasket 9 is provided between the shaft shoulder of the connecting sleeve 10 and the side surface of the valve body 1 .

[0036] In order to improve the sealing effect of the end of the sleeve 10, the end of the compression sleeve 6 away from the valve body 1 is threadedly connected to the nut 12, and the valve shaft 8 passes through the nut 12. A packing 11 is provided in the compression sleeve 6 on the side close to the nut 12, and a packing gland 13 is provided between the packing 11 and the nut 12; a step is extended to the left at the right end of the sleeve 10, and after the packing 11 is placed on the step, it is pressed with the packing gland 13 and finally sealed with the nut 12 to improve the sealing performance of the sleeve 10 at the right end and prevent leakage of the medium.

[0037] In order to facilitate the rotation of the valve shaft 8 and to facilitate the judgment of the rotation direction corresponding to the opening or closing of the control port, a handwheel 14 is fixed to the end of the valve shaft 8 away from the pressing sleeve 6 through a handwheel nut 16, and an indicator sign 15 is provided on the surface of the handwheel 14.

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A bypass check valve, characterized in that: include A valve body (1), wherein the valve body (1) is provided with a valve chamber (101), a control chamber (103) and a bypass channel (104); a valve port (102) is provided at one end of the valve chamber (101); the bypass channel (104) is connected to the valve port (102) and the control chamber (103); one end of the control chamber (103) is configured as a control port (105); the control port (105) is connected to the valve chamber (101) from the downstream of the valve port (102); A valve port passive opening and closing component connected to the valve body (1) to realize opening or closing of the valve port (102); The control port active opening and closing component is connected to the valve body (1) and is used to open or close the control port (105).

2. The bypass check valve according to claim 1, characterized in that: The valve port passive opening and closing assembly comprises a valve plate (2), a valve stem (3), and a torsion spring (4); both ends of the valve stem (3) are respectively fixedly connected to the valve body (1); the valve plate (2) is rotatably arranged on the valve stem (3); and the torsion spring (4) elastically connects the valve plate (2) and the valve stem (3); When the medium pressure acts on the valve plate (2), the valve plate (2) rotates around the valve stem (3) so that the valve port (102) is opened, and the elastic force of the torsion spring (4) increases; When the medium pressure does not act on the valve plate (2), the valve plate (2) is tightly attached to the valve seat (106) of the valve body (1) under the elastic force of the torsion spring (4), so that the valve port (102) is closed.

3. The bypass check valve according to claim 2, characterized in that: Two valve plates (2) and two torsion springs (4) are provided respectively, the two valve plates (2) are respectively sleeved on the valve stem (3) and are capable of rotating towards each other, and the two torsion springs (4) are respectively sleeved on the valve stem (3); A positioning column is provided on the valve cavity (101) parallel to the valve stem (3); one leg of the torsion spring (4) hooks onto the positioning column, and the other leg of the torsion spring (4) abuts against the surface of the valve plate (2).

4. The bypass check valve according to claim 1, characterized in that: The control port active opening and closing component comprises a compression sleeve (6), a valve shaft (8), and a connecting sleeve (10); the connecting sleeve (10) is arranged on the side of the valve body (1); the valve shaft (8) is threadedly connected to the connecting sleeve (10); one end of the valve shaft (8) extends into the control chamber (103) and is connected to the compression sleeve (6); the compression sleeve (6) can approach or move away from the control port (105) as the valve shaft (8) rotates, so as to realize the opening or closing of the control port (105).

5. The bypass check valve according to claim 4, characterized in that: A sealing ring (7) is provided on one side of the pressing sleeve (6) close to the control port (105); the sealing ring (7) is fixed to the pressing sleeve (6) via a pressing sleeve nut (5); and the sealing ring (7) is used to seal the control port (105).

6. The bypass check valve according to claim 4, characterized in that: A gasket (9) is provided between the shaft shoulder of the connecting sleeve (10) and the side surface of the valve body (1).

7. The bypass check valve according to claim 4, characterized in that: One end of the compression sleeve (6) away from the valve body (1) is threadedly connected to the nut (12), and the valve shaft (8) passes through the nut (12). A packing (11) is arranged inside the compression sleeve (6) on a side close to the nut (12), and a packing gland (13) is arranged between the packing (11) and the nut (12).

8. The bypass check valve according to claim 4, characterized in that: A handwheel (14) is fixedly provided at one end of the valve shaft (8) away from the compression sleeve (6) via a handwheel nut (16), and an indicator plate (15) is provided on the surface of the handwheel (14).

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