Check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a check valve which comprises a valve body, a butterfly plate is arranged in the valve body, a water inlet connecting flange and a water outlet connecting flange are arranged at the front end and the rear end of the valve body respectively, a pneumatic actuating mechanism set is arranged on the valve body, and a three-way valve is arranged on the pneumatic actuating mechanism set. A main air inlet pipe and a pneumatic air pipe are connected to the three-way valve, a water inlet flange sinking groove is formed in the water inlet connecting flange, a water inlet sinking groove sealing ring is arranged in the water inlet flange sinking groove, a water outlet flange sinking groove is formed in the water outlet connecting flange, and a water outlet sinking groove sealing ring is arranged in the water outlet flange sinking groove. And an upper inclined supporting plate and a lower inclined supporting plate are respectively arranged on the pneumatic air pipe. According to the double-clamp butterfly type check valve, the water leakage prevention sealing performance of the connecting portion of the double-clamp butterfly type check valve in the using process is integrally guaranteed, overall stable welding supporting of the pneumatic air pipe is achieved, the overall structure anti-shaking stability of the pneumatic air pipe is improved, and then normal using of the pneumatic air pipe is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve. Background Art

[0002] A check valve, also known as a one-way valve, is a valve that only allows fluid to flow in one direction to prevent backflow. Check valves are commonly used in various piping systems to ensure directional flow of fluid and avoid damage to equipment or pipelines due to back pressure.

[0003] There are many types of check valves, among which the double-clamp butterfly check valve is a commonly used one. During the opening and closing process of this check valve, the two butterfly valves will cooperate with each other to reduce the water hammer effect and ensure the safe operation of the pipeline.

[0004] The double-clamp butterfly check valve is generally composed of a valve body, a butterfly plate, a seal, an inlet connection flange, an outlet connection flange, a pneumatic actuator, etc. The pneumatic actuator is provided with a pneumatic air pipe. The pneumatic actuator and the pneumatic air pipe can pneumatically control the flipping effect of the butterfly plate, thereby realizing the normal operation of the double-clamp butterfly check valve. It is especially suitable for large-diameter pipelines and has been widely used in the fields of petroleum, chemical industry, electric power, etc.

[0005] At present, during installation, the water inlet connecting flange and the water outlet connecting flange are respectively installed on the water inlet pipe flange and the water outlet pipe flange by bolts. However, the existing double-clamp butterfly check valve has low sealing between the water inlet connecting flange and the water inlet pipe flange and between the water outlet connecting flange and the water outlet pipe flange. When in use, water leakage is prone to occur, which will affect the use effect of the double-clamp butterfly check valve.

[0006] In addition, the overall structural anti-sway stability of the two pneumatic air pipes of the pneumatic actuator of the double-clamp butterfly check valve is low.

[0007] The above problems are widespread and urgently need to be improved. Utility Model Content

[0008] The utility model aims to solve the above-mentioned shortcomings in the prior art and proposes a non-return valve.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A check valve is designed, comprising a valve body, wherein a butterfly plate is arranged in the valve body, and a water inlet connecting flange and a water outlet connecting flange are respectively arranged at the front and rear ends of the valve body, a pneumatic actuator group is arranged on the valve body, a three-way valve is arranged on the pneumatic actuator group, a main air inlet pipe and a pneumatic air pipe are connected to the three-way valve, a water inlet flange sink groove is provided on the water inlet connecting flange, a water inlet sink groove sealing ring is arranged in the water inlet flange sink groove, a water outlet flange sink groove is provided on the water outlet connecting flange, a water outlet sink groove is provided in the water outlet flange sink groove, and an upper diagonal support plate and a lower diagonal support plate are respectively arranged on the pneumatic air pipe.

[0011] Furthermore, the water inlet trough sealing ring and the water outlet trough sealing ring are both made of high-elastic FKM fluororubber, and the thickness of the water inlet trough sealing ring and the water outlet trough sealing ring is twenty to twenty-five centimeters.

[0012] Furthermore, the side cross-sections of the water inlet trough sealing ring and the water inlet flange trough are both ring-shaped structures, and the end surface of the water inlet trough sealing ring is higher than the water inlet flange trough.

[0013] Furthermore, the side cross-sections of the water outlet trough sealing ring and the water outlet flange trough are both ring-shaped structures, and the end surface of the water outlet trough sealing ring is higher than the water outlet flange trough.

[0014] Furthermore, the three-way valve is arranged at the top of the pneumatic actuator group, the main air intake pipe is connected to the top of the three-way valve, the pneumatic air pipe is two symmetrical groups on the left and right and connected to the three-way valve, the pneumatic air pipe is an L-bend structure pipe body as a whole, the upper diagonal support plate is two symmetrical groups on the left and right, each group is two obliquely symmetrically arranged, and the angle between the upper diagonal support plate and the horizontal plane is sixty degrees.

[0015] Furthermore, the lower diagonal bracing plates are divided into two groups that are symmetrical on the left and right, each group has two symmetrically arranged plates, and the lower diagonal bracing plates are arranged horizontally.

[0016] Furthermore, the upper diagonal support plate and the lower diagonal support plate are both made of hard alloy tungsten steel.

[0017] The utility model provides a check valve, which has the following beneficial effects:

[0018] 1. The utility model provides an inlet flange sink groove with an inlet sink groove sealing ring on the water inlet connecting flange, and provides an outlet flange sink groove with an outlet sink groove sealing ring on the water outlet connecting flange, thereby improving the sealing and water leakage prevention performance of the water inlet connecting flange after being connected to the external water inlet pipe flange, and improving the sealing and water leakage prevention performance of the water outlet connecting flange after being connected to the external water outlet pipe flange, thereby ensuring the overall water leakage prevention and sealing performance of the connection parts of the double-clamp butterfly check valve when in use.

[0019] 2. The utility model realizes the overall stable welding support of the pneumatic air pipe by setting up the inclined symmetrical upper diagonal support plate and the lower diagonal support plate structure, thereby improving the anti-sway stability of the overall structure of the pneumatic air pipe and ensuring the normal use of the pneumatic air pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a first-view stereoscopic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a stereoscopic diagram of the overall structure of the utility model from a second viewing angle;

[0022] Figure 3 It is a schematic side view of the overall structure of the utility model;

[0023] Figure 4 For the utility model Figure 3 A magnified view of the local section at point N;

[0024] Figure 5 It is a schematic top view of the overall structure of the utility model.

[0025] In the figure: 1 valve body; 11 butterfly plate; 2 water inlet connecting flange; 21 water inlet flange sink; 3 water outlet connecting flange; 31 water outlet flange sink; 4 water inlet sink sealing ring; 5 pneumatic actuator group; 51 three-way valve; 52 main air inlet pipe; 53 pneumatic air pipe; 6 upper diagonal support plate; 7 lower diagonal support plate; 8 water outlet sink sealing ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Reference Figure 1-5 A check valve comprises a valve body 1, wherein a butterfly plate 11 is arranged in the valve body 1, and a water inlet connecting flange 2 and a water outlet connecting flange 3 are respectively arranged at the front and rear ends of the valve body 1, a pneumatic actuator group 5 is arranged on the valve body 1, and a three-way valve 51 is arranged on the pneumatic actuator group 5, and a main air inlet pipe 52 and a pneumatic air pipe 53 are connected to the three-way valve 51, and a water inlet flange sink groove 21 is provided on the water inlet connecting flange 2, and a water inlet sink groove sealing ring 4 is arranged in the water inlet flange sink groove 21, a water outlet flange sink groove 31 is provided on the water outlet connecting flange 3, and a water outlet sink groove sealing ring 8 is arranged in the water outlet flange sink groove 31, and an upper diagonal support plate 6 and a lower diagonal support plate 7 are respectively arranged on the pneumatic air pipe 53.

[0028] The valve body 1, the butterfly plate 11, the water inlet connection flange 2, and the water outlet connection flange 3 are all related components on the double-clamp butterfly check valve, which are existing technologies. Some existing structures are not drawn and marked, and there is no need to repeat them.

[0029] The pneumatic actuator group 5, the three-way valve 51, the main air inlet pipe 52, and the pneumatic air pipe 53 are the related components on the double-clamp butterfly check valve, which are prior art. Some existing structures are not drawn and marked, and no further description is required. The butterfly plate 11 can be pneumatically rotated on the valve body 1 to achieve the effect.

[0030] In detail, the water inlet trough sealing ring 4 and the water outlet trough sealing ring 8 are both made of high-elastic FKM fluororubber material. The molecular structure of the high-elastic FKM fluororubber material contains fluorine atoms, and has excellent high temperature resistance, chemical corrosion resistance, oil resistance and solvent resistance. It can be used in harsh environments such as high temperature, high pressure, high speed, and high load. It has low gas permeability, good air tightness, and high tensile strength, tear strength and wear resistance.

[0031] The thickness of the water inlet trough sealing ring 4 and the water outlet trough sealing ring 8 is 20 to 25 centimeters. The thickened water inlet trough sealing ring 4 and the water outlet trough sealing ring 8 structure can greatly ensure the extrusion elastic sealing effect after installation.

[0032] Furthermore, the side cross-sections of the water inlet trough sealing ring 4 and the water inlet flange trough 21 are both ring-shaped structures, and the end surface of the water inlet trough sealing ring 4 is higher than the water inlet flange trough 21 .

[0033] Furthermore, the side cross-sections of the water outlet trough sealing ring 8 and the water outlet flange trough 31 are both ring-shaped structures. The end face of the water outlet trough sealing ring 8 is higher than the water outlet flange trough 31. Combined with the water inlet trough sealing ring 4 and the water outlet trough sealing ring 8 made of high-elastic FKM fluororubber material, an annular extrusion sealing effect is achieved to prevent water leakage.

[0034] In more detail, the three-way valve 51 is arranged at the top of the pneumatic actuator group 5, the main air intake pipe 52 is connected to the top of the three-way valve 51, the pneumatic air pipe 53 is two symmetrical groups connected to the three-way valve 51, the pneumatic air pipe 53 is an L-bend structure pipe body as a whole, the upper diagonal support plate 6 is two symmetrical groups, each group is two inclined and symmetrically arranged, the angle between the upper diagonal support plate 6 and the horizontal plane is sixty degrees, the inclined structure is highly stable, and the symmetrically inclined upper diagonal support plate 6 can improve the stability and anti-sway property of the upper part of the pipe body of the pneumatic air pipe 53.

[0035] In general, the lower diagonal support plates 7 are divided into two groups that are symmetrical on the left and right, and each group has two symmetrically arranged lower diagonal support plates 7. The lower diagonal support plates 7 are arranged horizontally and transversely. The symmetrical lower diagonal support plates 7 can improve the stability and anti-sway property of the lower part of the pneumatic air pipe 53.

[0036] Finally, the upper diagonal support plate 6 and the lower diagonal support plate 7 are both made of hard alloy tungsten steel, which has high strength, weather resistance and corrosion resistance, is easy to weld, and does not deform.

[0037] Working method: align the water inlet connecting flange 2 with the external water outlet pipe flange, and then install them through bolts. At this time, the water inlet trough sealing ring 4 will be squeezed and deformed, and the contact parts of the water inlet connecting flange 2, the external water outlet pipe flange and the water inlet flange trough 21 will be sealed as a whole. Similarly, align the water outlet connecting flange 3 with the external water outlet pipe flange, and then install them through bolts. At this time, the water outlet trough sealing ring 8 will be squeezed and deformed, and the contact parts of the water outlet connecting flange 3, the external water outlet pipe flange and the water outlet flange trough 31 will be sealed as a whole, thereby improving the sealing and water-proofing of the water inlet connecting flange 2 after being connected to the external water inlet pipe flange, and at the same time improving the sealing and water-proofing of the water outlet connecting flange 3 after being connected to the external water outlet pipe flange, thereby ensuring the overall water-proofing and water-proofing of the connection parts of the double-clamp butterfly check valve when in use.

[0038] In addition, by setting up the inclined symmetrical upper diagonal support plate 6 and the lower diagonal support plate 7 structure, the overall stable welding support of the pneumatic air pipe 53 is achieved, which improves the overall anti-sway stability of the pneumatic air pipe 53 and ensures the normal use of the pneumatic air pipe 53.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A check valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a butterfly plate (11), and the front and rear ends of the valve body (1) are respectively provided with a water inlet connection flange (2) and a water outlet connection flange (3). The valve body (1) is provided with a pneumatic actuator group (5), and the pneumatic actuator group (5) is provided with a three-way valve (51). The three-way valve (51) is connected to a main air inlet pipe (52) and a pneumatic air pipe (53). The water inlet connection flange (2) is provided with a water inlet flange sink groove (21), and a water inlet sink groove sealing ring (4) is provided in the water inlet flange sink groove (21). The water outlet connection flange (3) is provided with a water outlet flange sink groove (31), and a water outlet sink groove sealing ring (8) is provided in the water outlet flange sink groove (31). The pneumatic air pipe (53) is respectively provided with an upper diagonal support plate (6) and a lower diagonal support plate (7).

2. A check valve according to claim 1, characterized in that: The water inlet trough sealing ring (4) and the water outlet trough sealing ring (8) are both made of a high-elastic FKM fluororubber material, and the thickness of the water inlet trough sealing ring (4) and the water outlet trough sealing ring (8) is 20 to 25 centimeters.

3. A check valve according to claim 1, characterized in that: The side cross-sections of the water inlet trough sealing ring (4) and the water inlet flange trough (21) are both ring-shaped structures, and the end surface of the water inlet trough sealing ring (4) is higher than the water inlet flange trough (21).

4. A check valve according to claim 1, characterized in that: The side cross-sections of the water outlet trough sealing ring (8) and the water outlet flange trough (31) are both ring-shaped structures, and the end surface of the water outlet trough sealing ring (8) is higher than the water outlet flange trough (31).

5. A check valve according to claim 1, characterized in that: The three-way valve (51) is arranged at the top end of the pneumatic actuator group (5), the main air intake pipe (52) is connected to the top end of the three-way valve (51), the pneumatic air pipe (53) is two symmetrical groups connected to the three-way valve (51), the pneumatic air pipe (53) is an L-bend structure pipe body as a whole, the upper inclined support plates (6) are two symmetrical groups, each group is two inclined symmetrical groups, and the angle between the upper inclined support plates (6) and the horizontal plane is sixty degrees.

6. A check valve according to claim 1, characterized in that: The lower diagonal support plates (7) are provided in two groups that are symmetrical on the left and right, with two of each group being symmetrically arranged, and the lower diagonal support plates (7) are arranged horizontally.

7. A check valve according to claim 1, characterized in that: The upper diagonal support plate (6) and the lower diagonal support plate (7) are both made of hard alloy tungsten steel.

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