A clamp-on check valve

Abstract

The utility model belongs to valve technical field provides a kind of to clamp type check valve, including valve body, two symmetrical settings and detachable installation in the inside of the valve body mounting base, set in the two mounting base between pin shaft and limit rod, sleeve connection in the left valve clack of the pin shaft left side and right valve clack of right side, two immediately setting and sleeve connection on the torsional spring of the pin shaft, and with the valve body through fastening bolt connection and for covering the mounting base upper end face cover plate. Through above-mentioned setting, realize the assembly of to clamp type check valve, compared with the assembly mode of the existing technology on the valve body opening shaft hole, the valve body in the utility model need not opening hole to realize assembly, thus do not use sealing plug to seal shaft hole, to avoid the disadvantage of sealing plug failure due to pipeline vibration, water hammer phenomenon and other reasons.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically, it relates to a wafer-type check valve. Background Technology

[0002] Wafer check valves are used in fluid pipeline systems. They rely on the flow of the medium in the pipeline to generate power, automatically opening and closing. They can prevent backflow of the medium in the pipeline, prevent pumps and their drive motors from reversing, and prevent the release of the medium from containers. Wafer check valves are widely used in engineering systems due to their advantages such as short structural length, small size, light weight, simple and compact design, and sensitive operation. In existing technology, wafer check valves mainly include a valve body, valve disc, and pin. The valve body has symmetrical shaft holes on both sides. During assembly, the pin is first passed through the shaft hole at one end, then the valve disc, spring, and other structures are installed, and then the pin is inserted into the shaft hole at the other end. The outside of the shaft hole is sealed with a sealing plug. However, during long-term use, due to pipeline vibration, water hammer, and other factors, the sealing plug is prone to failure, leading to poor sealing and easy leakage of the medium from the shaft hole. Utility Model Content

[0003] The purpose of this utility model is to provide a wafer-type check valve to solve the technical problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A wafer-type check valve includes a valve body, two symmetrically arranged and detachably mounted mounting bases inside the valve body, a pin and a limiting rod disposed between the two mounting bases, a left valve disc and a right valve disc sleeved on the left and right sides of the pin, two adjacent torsion springs sleeved on the pin, and a cover plate connected to the valve body by fastening bolts and used to cover the upper surface of the mounting bases; the limiting rod is located directly above the pin, the two torsion springs are positioned on the pin between the left and right valve discs, and a first gasket and a second gasket are sleeved on the pin to separate adjacent components.

[0005] Preferably, two mounting grooves matching the mounting base are symmetrically arranged on the inner side of the valve body, and a cover plate groove communicating with the upper end of the mounting groove is provided. Mounting and fixing holes are also provided on both sides of the bottom of the cover plate groove. The mounting base is assembled into the mounting groove, and the cover plate is assembled into the cover plate groove.

[0006] Preferably, a protruding limiting strip is provided on the inner side of the rear end of the mounting groove, and a limiting groove matching the limiting strip is provided on the outer side of the rear end of the mounting base.

[0007] Preferably, the front end face of the mounting base is provided with a pin hole and a limit rod mounting hole, the pin hole and the limit rod mounting hole are coaxially arranged, and the limit rod mounting hole is located directly above the pin hole.

[0008] Preferably, both the left and right valve discs are symmetrically provided with sleeves for fitting onto the pin, and the sleeves located on the same side are arranged adjacent to each other.

[0009] Preferably, there are two first gaskets, which are respectively disposed at both ends of the pin, and one side of the first gasket is adjacent to the front end face of the mounting base.

[0010] Preferably, the second gasket is provided between adjacent sleeves, between the sleeve and the torsion spring, and between adjacent torsion springs.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention is based on a double-disc wafer check valve. An installation groove and a cover plate groove are provided on the inner side of the valve body. An installation base is detachably installed based on the installation groove. The installation base facilitates the assembly of the pin, limit rod, left valve disc, right valve disc, and torsion spring. The cover plate is then used to press and fix the installation base to prevent it from shifting. This design enables the assembly of the wafer check valve. Compared to existing technologies that require opening a shaft hole in the valve body, this invention allows for assembly without opening a hole in the valve body. Therefore, a sealing plug is not needed to seal the shaft hole, thus avoiding the drawback of seal failure due to pipeline vibration, water hammer, etc. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram showing the disassembled parts of this utility model.

[0014] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the diagram.

[0015] Figure 4 This is a schematic diagram of the back of the mounting base in this utility model.

[0016] The component names corresponding to the reference numerals in the attached drawings are as follows: 1-valve body, 2-mounting base, 3-pin, 4-left valve disc, 5-right valve disc, 6-torsion spring, 7-limiting rod, 8-fastening bolt, 9-cover plate, 10-first gasket, 11-second gasket, 12-mounting groove, 13-cover plate groove, 14-limiting strip, 15-limiting groove, 16-pin hole, 17-limiting rod mounting hole, 18-sleeve. Detailed Implementation

[0017] To enable those skilled in the art to have a clearer understanding of this utility model, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described below are merely illustrative of this utility model and facilitate understanding. The technical solutions provided by this utility model are not limited to those provided in the following embodiments, nor should they limit the scope of protection of this utility model.

[0018] Example like Figures 1-4 As shown, this embodiment provides a wafer check valve. Based on the double-disc wafer check valve, the device changes the assembly method of the check valve through a symmetrical and detachable mounting base, double torsion spring drive and optimized component layout. The valve body can be assembled without opening holes, so there is no need to seal the shaft hole with a sealing plug, thereby avoiding the disadvantage of sealing failure due to pipeline vibration, water hammer and other reasons.

[0019] In this embodiment, the wafer check valve mainly includes a valve body 1, a mounting base 2, a pin 3, a left valve disc 4, a right valve disc 5, a torsion spring 6, a limit rod 7, a fastening bolt 8, a cover plate 9, a first gasket 10, and a second gasket 11.

[0020] The valve body 1 has a clamp-type structure with two symmetrical mounting grooves 12 machined on the upper end of its inner side. The mounting grooves 12 are used to accommodate and position the mounting base 2. Above each mounting groove 12, a cover plate groove 13 is machined and communicates with it. On both sides of the bottom of the cover plate groove 13, there are threaded mounting holes. The cover plate 9 is installed in the cover plate groove and fixed with fastening bolts 9. The mounting base 2 is fixed in the mounting groove 12 and then the upper end is covered and fixed by the cover plate 9.

[0021] There are two mounting bases 2, arranged symmetrically in mirror image of each other. Their outer contours match the mounting groove 12 on the inner side of the valve body 1, allowing for precise assembly and fixation within the mounting groove 12. To ensure that the mounting base 2 does not move axially within the groove, a protruding limiting strip 14 is provided on the inner rear end of the mounting groove 12 (i.e., the side near the center of the valve body flow channel). Simultaneously, a matching limiting groove 15 is machined on the corresponding outer side of the mounting base 2. During assembly, the limiting strip 14 is embedded in the limiting groove 15, forming a limiting mechanism. Two coaxial through holes are machined on the front end face of the mounting base 2 (i.e., the side facing the valve body inlet / outlet): a pin hole 16 located below and a limiting rod mounting hole 17 located directly above.

[0022] The pin 3 and the limiting rod 7 pass through the corresponding pin holes 16 and limiting rod mounting holes 17 on the two mounting bases 2, connecting the two mounting bases 2 and fixing them inside the valve body 1. The limiting rod 7 is located directly above the pin 3, and its main function is to limit the opening angle of the left valve disc 4 and the right valve disc 5.

[0023] The left valve disc 4 and the right valve disc 5 are connected to the pin 3 by symmetrically arranged sleeves 18 on their upper parts, and can rotate around the pin 3. The left valve disc 4 is located on the left side of the pin 3, and the right valve disc 5 is located on the right side of the pin 3. When closed, the two together seal the valve body flow channel. The sleeves 18 of the left valve disc 4 and the right valve disc 5 are arranged adjacent to each other on the pin 3.

[0024] Two torsion springs 6 are also sleeved on the pin 3, and their installation position is between the sleeve 18 of the left valve disc 4 and the right valve disc 5. The two ends of the torsion springs 6 act on the left valve disc 4 and the right valve disc 5 respectively, providing a continuous closing torque for the valve discs, ensuring that the valve discs can close quickly when the fluid reverses.

[0025] The first shim 10 and the second shim 11 are used to isolate and position the various components on the pin 3, reducing wear and ensuring smooth movement. Specifically, there are two first shims 10, which are respectively fitted onto both ends of the pin 3, with one side tightly against the front end face of the mounting base 2. The second shims 11 are disposed between adjacent moving parts that need to be isolated, specifically between the adjacent sleeves 18 of the left valve disc 4 and the right valve disc 5, between the sleeves 18 and the torsion springs 6, and between two adjacent torsion springs 6.

[0026] The cover plate 9 is screwed into the mounting hole by the fastening bolts 8 and fixed in the cover plate groove 13 of the valve body 1. The main function of the cover plate 9 is to cover the upper end face of the mounting base 2 to prevent internal components from shifting.

[0027] The assembly process of this utility model is as follows: The first gasket 10, left valve disc 4 (via sleeve 18), second gasket 11, two torsion springs 6 (separated by the second gasket 11), another second gasket 11, right valve disc 5 (via sleeve 18), and another first gasket 10 are sequentially fitted onto the pin 3. One end of the assembled pin 3 is inserted into the pin hole 16 of one mounting base 2, and then the limiting rod 7 is inserted into the corresponding limiting rod mounting hole 17. The other ends of the pin 3 and the limiting rod 7 are then inserted into the corresponding holes of the other mounting base 2. The two mounting bases 2 are aligned with the mounting groove 12 from inside the valve body 1, and slid in and positioned by the cooperation of the limiting groove 15 and the limiting strip 14. Finally, the cover plate 9 is placed into the cover plate groove 13 and tightened with the fastening bolts 8, completing the assembly of the entire valve.

[0028] When fluid flows in the forward direction, the fluid pressure pushes the left and right valve discs to rotate around pin 3 and open. When the fluid stops or reverses, the left and right valve discs quickly close under the restoring force of torsion spring 6 and come into contact with the valve seat sealing surface to prevent backflow of the medium. Limit rod 7 limits the maximum opening of the valve discs to prevent excessive rotation.

[0029] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A wafer-type check valve, characterized in that, The device includes a valve body (1), two symmetrically arranged and detachably mounted mounting bases (2) inside the valve body (1), a pin (3) and a limiting rod (7) disposed between the two mounting bases (2), a left valve disc (4) and a right valve disc (5) sleeved on the left side of the pin (3), two torsion springs (6) disposed adjacently and sleeved on the pin (3), and a cover plate (9) connected to the valve body (1) by fastening bolts (8) and used to cover the upper end face of the mounting base (2); the limiting rod (7) is located directly above the pin (3), the two torsion springs (6) are positioned on the pin (3) between the left valve disc (4) and the right valve disc (5), and a first gasket (10) and a second gasket (11) for separating adjacent components are also sleeved on the pin (3).

2. The wafer-type check valve according to claim 1, characterized in that: Two mounting grooves (12) matching the mounting base (2) are symmetrically arranged on the inner side of the valve body (1). A cover plate groove (13) communicating with the upper end of the mounting groove (12) is provided. Mounting and fixing holes are also provided on both sides of the bottom of the cover plate groove (13). The mounting base (2) is assembled into the mounting groove (12), and the cover plate (9) is assembled into the cover plate groove (13).

3. The wafer-type check valve according to claim 2, characterized in that: A protruding limiting strip (14) is provided on the inner rear end of the mounting groove (12), and a limiting groove (15) matching the limiting strip (14) is provided on the outer rear end of the mounting base (2).

4. The wafer-type check valve according to claim 3, characterized in that: The front end face of the mounting base (2) is provided with a pin hole (16) and a limit rod mounting hole (17). The pin hole (16) and the limit rod mounting hole (17) are coaxially arranged and the limit rod mounting hole (17) is located directly above the pin hole (16).

5. The wafer-type check valve according to claim 4, characterized in that: Both the left valve disc (4) and the right valve disc (5) are symmetrically provided with sleeves (18) for sleeved on the pin (3), and the sleeves (18) located on the same side are arranged adjacent to each other.

6. The wafer-type check valve according to claim 5, characterized in that: There are two first gaskets (10) respectively located at both ends of the pin (3), and one side of the first gasket (10) is adjacent to the front end face of the mounting base (2).

7. The wafer-type check valve according to claim 6, characterized in that: The second gasket (11) is provided between adjacent sockets (18), between the sockets (18) and the torsion springs (6), and between adjacent torsion springs (6).

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