Dual check valve

Abstract

The utility model provides a double check valve, and belongs to the technical field of valves. The check valve solves the problem that an existing valve with a single check function still can stop backflow in the long-time use process. The double check valve comprises a valve body, the valve body is divided into a left valve body and a right valve body, a first check assembly is arranged in the left valve body, a second check assembly is arranged in the right valve body, a first fixing part is arranged in the left valve body, the first check assembly is composed of a first supporting part, a first check piece and a first reset spring, and a second fixing part is arranged on the inner wall of the right valve body. The second non-return assembly is composed of a second supporting part, a second non-return part and a second reset spring. The rear end of the first non-return part and the front end of the second non-return part are both arranged on the first supporting part, and the second non-return part can be jacked by the first non-return part. The non-return valve has the advantage of having a double non-return function.

Description

Technical Field

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

[0002] In industrial pipelines, in order to prevent the backflow of the medium in the pipeline from causing damage to the power pump, a check valve is often designed and installed at the outlet of the power pump. A check valve refers to a valve whose opening and closing part is a circular valve disc and which relies on its own weight and medium pressure to produce a movement to block the backflow of the medium.

[0003] At present, a valve with a single check function may still experience a shut-off backflow phenomenon during long-term use, thereby causing great inconvenience to the user and reducing the practicality of the existing valve. Summary of the invention

[0004] The utility model aims to provide a valve with a double check function in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a double check valve, comprising a valve body, the valve body is divided into a left valve body and a right valve body, characterized in that a check component 1 is arranged in the left valve body, a check component 2 is arranged in the right valve body, a fixed part 1 is arranged in the left valve body, the check component 1 is composed of a support part 1, a check piece 1 and a return spring 1, the check piece 1 can be moved on the support part 1 by the action of the return spring 1 to control the opening and closing of the fixed part 1 flow channel, a fixed part 2 is arranged on the inner wall of the right valve body, the check component 2 is composed of a support part 2, a check piece 2 and a return spring 2, the check piece 2 can be moved on the support part 2 by the action of the return spring 2 to control the opening and closing of the fixed part 2 flow channel, the rear end portion of the check piece 1 and the front end portion of the check piece 2 are both arranged on the support part 1 and the check piece 2 can be pushed by the check piece 1.

[0006] In the above-mentioned double check valve, a plurality of water holes are provided on the first fixing part, a plurality of water holes are provided on the first supporting part, and a water hole is provided on the second fixing part.

[0007] In the above-mentioned double check valve, the check piece 1 is arranged in a T-shaped structure, and the fixed part 1 is also provided with a positioning rod for the check piece 1 to perform directional movement, one end of the positioning rod extends into the check piece 1, and the check piece 2 is arranged in a cross-shaped structure, and the front end of the check piece 2 is against the rear end of the fixed part 2.

[0008] In the above-mentioned double check valve, the first return spring is arranged between the first return piece and the first support portion, and the second return spring is arranged between the second return piece and the second support portion.

[0009] In the above-mentioned double check valve, the left valve body and the right valve body are detachably fixedly connected by bolts, and the check assembly 1 is detachably fixedly connected to the left valve body by bolts.

[0010] In the above-mentioned double check valve, flanges for connection are provided on both the left and right sides of the left valve body and the right valve body.

[0011] Compared with the prior art, the double check valve has a double check effect on the flow channel inside the valve body through the check component 1 and the check component 2, further improving the check ability of the valve body during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure, 1. left valve body; 2. right valve body; 3. check assembly 1; 4. check assembly 2; 5. fixing part 1; 6. supporting part 1; 7. check piece 1; 8. return spring 1; 9. fixing part 2; 10. supporting part 2; 11. check piece 2; 12. return spring 2; 13. positioning rod; 14. flange. DETAILED DESCRIPTION

[0014] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0015] like Figure 1 As shown, the double check valve comprises a valve body, and the valve body is divided into a left valve body 1 and a right valve body 2. A check assembly 3 is arranged in the left valve body 1, and a check assembly 2 4 is arranged in the right valve body 2. A fixed portion 5 is arranged in the left valve body 1. The check assembly 3 is composed of a support portion 6, a check piece 7 and a reset spring 8. The check piece 7 can be moved on the support portion 6 by the action of the reset spring 8 to control the opening and closing of the fixed portion 5 flow channel. A fixed portion 2 9 is arranged on the inner wall of the right valve body 2. The check assembly 2 4 is composed of a support portion 2 10, a check piece 2 11 and a reset spring 2 12. The check piece 2 11 can be moved on the support portion 2 10 by the action of the reset spring 2 12 to control the opening and closing of the fixed portion 2 flow channel. The rear end portion of the check piece 7 and the front end portion of the check piece 2 11 are both arranged on the support portion 6 and the check piece 2 11 can be pushed by the check piece 7.

[0016] To explain in further detail, the liquid enters the interior of the valve body from one end of the left valve body 1, and the check piece 7 moves backward on the support part under the action of water pressure, the return spring 8 is in a compressed state, and the fixed part 5 is in a flow state, and the liquid flows from the fixed part 5 into the fixed part 2 9, and the check piece 7 moves backward, and at the same time, the check piece 2 11 is pushed backward, and at the same time, the check piece 2 11 is also moved backward under the action of pressure, the return spring 2 12 is in a compressed state, and the fixed part 2 9 is in a flow state, and the liquid flows out from the right valve body 2, and when the liquid stops flowing, the return spring 18 and the return spring 2 12 rebound, and the check piece 7 and the check piece 2 11 move forward to close the water holes at the fixed part 15 and the fixed part 29 to prevent the liquid from flowing back, which has a cutting effect on the liquid.

[0017] To be more specific, the fixing part 5 is provided with a plurality of water holes, the supporting part 6 is provided with a plurality of water holes, and the fixing part 2 9 is provided with a water hole.

[0018] To elaborate further, the check member 7 is arranged in a T-shaped structure, and a positioning rod 13 is also arranged on the fixing portion 5 for the check member 7 to perform directional movement, one end of the positioning rod 13 extends into the check member 7, and the check member 11 is arranged in a cross-shaped structure, and the front end of the check member 11 is against the rear end of the fixing portion 9.

[0019] To be more specific, the return spring 8 is disposed between the check piece 7 and the support portion 6 , and the return spring 12 is disposed between the check piece 11 and the support portion 10 .

[0020] To elaborate further, the left valve body 1 and the right valve body 2 are detachably fixedly connected by bolts, and the check assembly 3 is detachably fixedly connected to the left valve body 1 by bolts.

[0021] In further detail, flanges 14 for connection are provided on both the left and right sides of the left valve body 1 and the right valve body 2. The flanges 14 are provided for connecting the left valve body 1 to an external pipeline or the right valve body 2 to an external pipeline.

[0022] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0023] Although this article uses more terms such as left valve body 1, right valve body 2, check assembly 1 3, check assembly 2 4, fixing part 1 5, supporting part 1 6, check piece 1 7, return spring 1 8, fixing part 2 9, supporting part 2 10, check piece 2 11, return spring 2 12, positioning rod 13, flange 14, etc. in the figure, it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A double check valve, comprising a valve body, wherein the valve body is divided into a left valve body (1) and a right valve body (2), characterized in that: The left valve body (1) is provided with a check assembly 1 (3), the right valve body (2) is provided with a check assembly 2 (4), the left valve body (1) is provided with a fixing portion 1 (5), the check assembly 1 (3) is composed of a supporting portion 1 (6), a check piece 1 (7) and a return spring 1 (8), the check piece 1 (7) can move on the supporting portion 1 (6) through the action of the return spring 1 (8) to control the opening and closing of the flow channel of the fixing portion 1 (5), the right valve body (2) is provided with a fixing portion 1 (5), and the check piece 1 (3) is composed of a supporting portion 1 (6), a check piece 1 (7) and a return spring 1 (8), the check piece 1 (7) can move on the supporting portion 1 (6) through the action of the return spring 1 (8) to control the opening and closing of the flow channel of the fixing portion 1 (5), and the right valve body (2) is provided with a fixing portion 1 (5). A second fixing portion (9) is provided on the wall, and the second non-return assembly (4) is composed of a second supporting portion (10), a second non-return piece (11) and a second return spring (12). The second non-return piece (11) can be moved on the second supporting portion (10) by the action of the second return spring (12) to control the opening and closing of the second fixed flow channel. The rear end of the first non-return piece (7) and the front end of the second non-return piece (11) are both provided on the first supporting portion (6), and the second non-return piece (11) can be pushed by the first non-return piece (7).

2. A double check valve according to claim 1, characterized in that: The fixing part 1 (5) is provided with a plurality of water holes, the supporting part 1 (6) is provided with a plurality of water holes, and the fixing part 2 (9) is provided with a water hole.

3. A double check valve according to claim 1, characterized in that: The first stop member (7) is arranged in a T-shaped structure. The first fixed portion (5) is also provided with a positioning rod (13) for the first stop member (7) to perform directional movement. One end of the positioning rod (13) extends into the first stop member (7). The second stop member (11) is arranged in a cross-shaped structure. The front end of the second stop member (11) abuts against the rear end of the second fixed portion (9).

4. A double check valve according to claim 1, characterized in that: The return spring 1 (8) is arranged between the stop member 1 (7) and the support portion 1 (6), and the return spring 2 (12) is arranged between the stop member 2 (11) and the support portion 2 (10).

5. A double check valve according to claim 1, characterized in that: The left valve body (1) and the right valve body (2) are detachably fixedly connected via bolts, and the check assembly 1 (3) is detachably fixedly connected to the left valve body (1) via bolts.

6. A double check valve according to claim 1, characterized in that: Flange plates (14) for connection are provided on the left and right sides of the left valve body (1) and the right valve body (2).

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