Non-return loose joint gate valve

Abstract

The utility model provides a check loose joint gate valve, and belongs to the technical field of valves. The non-return gate valve solves the problems that an existing gate valve does not have a non-return function, and when the gate valve is in an open state, fluid in an outlet cavity possibly flows back and easily enters the upstream of a pipeline to cause pollution. The check loose joint gate valve comprises a gate valve body, a water inlet pipeline and a water outlet pipeline are arranged in the gate valve body, a gate valve plate is arranged in the gate valve body, the water inlet pipeline is movably connected with a connecting pipeline through a loose joint cap, the water outlet pipeline is connected with a connector, a check valve assembly is arranged in the water inlet pipeline, and the check valve assembly is composed of a fixed valve body and a check piece. The front end and the rear end of the fixed valve body are respectively provided with a water passing hole for water to pass through, a fixed part is fixedly arranged on the fixed valve body, a plurality of open holes for water to pass through are formed in the fixed part, and the front end part and the rear end part of the non-return piece are respectively provided with a non-return part I and a non-return part II. The non-return valve has the advantage of double non-return functions.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a gate valve, in particular to a non-return flexible joint gate valve. Background Art

[0002] A gate valve is a disc that opens and closes the flow. The disc's movement is perpendicular to the flow direction. A gate valve can only be fully opened or closed, and cannot be adjusted or throttled. A gate valve seals through contact between the valve seat and the disc. The sealing surface is typically welded with metal materials such as 1Cr13, STL6, or stainless steel to increase wear resistance. There are two types of discs: rigid and flexible. Depending on the type of disc, gate valves are classified as either rigid or flexible.

[0003] During the installation of ordinary gate valves, the pipe threads at one end of the pipe and the gate valve body are tightened first, and then the pipe at the other end is tightened with the pipe threads at the other end of the gate valve body. This is extremely inconvenient for installation and can easily cause damage to the gate valve body, thus affecting the service life of the product.

[0004] Existing gate valves do not have a check function. When the gate valve is in the open state, the fluid in the outlet cavity may flow back and easily enter the upstream pipeline to cause pollution. Summary of the Invention

[0005] The purpose of the utility model is to provide a flexible gate valve with a double check function in order to solve the above problems in the prior art.

[0006] The objectives of the utility model can be achieved through the following technical solutions: a non-return flexible joint gate valve, comprising a gate valve body, an inlet pipe and an outlet pipe are arranged in the gate valve body, a gate valve plate for controlling liquid circulation is arranged in the gate valve body, and the characteristic is that the water inlet pipe is flexibly connected to a connecting pipe through a flexible cap, the water outlet pipe is connected to a joint through an octagonal cap, a check valve assembly with a double non-return function is arranged in the water inlet pipe, the check valve assembly consists of a fixed valve body and a check piece, water flow holes are provided at the front and rear ends of the fixed valve body, a fixing part is fixedly arranged on the fixed valve body, a plurality of openings for water flow are provided on the fixed part, a check part one and a check part two are provided at the front and rear ends of the check piece, the check piece slides on the fixing part, so that the water flow holes at the front and rear ends are closed and circulate.

[0007] In the above-mentioned non-return flexible gate valve, a fixing ring is provided on the water-passing part, and a connecting spring is provided between the fixing ring and the fixing part. The connecting spring enables the first and second non-return parts to cooperate with the water-passing holes provided at the front and rear ends respectively, thereby preventing the liquid from returning.

[0008] In the above-mentioned non-return movable-joint gate valve, a connecting portion is protruded from the rear end portion of the fixed valve body, and a filter screen for filtering is provided on the connecting portion.

[0009] In the above-mentioned non-return flexible joint gate valve, an O-ring is provided between the flexible joint cap and the water inlet pipe, and an O-ring is provided between the octagonal cap and the water outlet pipe.

[0010] Compared with the existing technology, this non-return flexible joint gate valve has the following advantages:

[0011] 1. The external connecting pipe is connected to the valve body and the water inlet pipe through a union cap to form a union structure, which facilitates the connection between the gate valve body and the pipe and ensures the strength and sealing effect of the connection between the union and the valve body.

[0012] 2. The valve body is equipped with a double check function to enhance the check effect of the valve body and prevent the fluid from flowing back and easily entering the upstream pipeline to cause pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure 2 It is a schematic cross-sectional structural diagram of the present utility model.

[0015] In the figure, 1. gate valve body; 2. water inlet pipe; 3. water outlet pipe; 4. gate valve plate; 5. union cap; 6. check valve assembly; 7. fixed valve body; 8. check piece; 9. fixed part; 10. check part 1; 11. check part 2; 12. fixing ring; 13. connecting spring; 14. connecting part; 15. filter screen; 16. octagonal cap; 17. connector. DETAILED DESCRIPTION

[0016] 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.

[0017] like Figure 1 、 Figure 2As shown, the non-return flexible joint gate valve comprises a gate valve body 1, wherein the gate valve body 1 is provided with an inlet pipe 2 and an outlet pipe 3, and the gate valve body 1 is provided with a gate valve plate 4 for controlling liquid circulation, and is characterized in that the inlet pipe 2 is flexibly connected to a connecting pipe through a flexible cap 5, and the outlet pipe 3 is connected to a joint 17 through an octagonal cap 16, and a check valve assembly 6 with a double non-return function is provided in the water inlet pipe 2, and the check valve assembly 6 is composed of a fixed valve body 7 and a check piece 8, and water holes for passing water are provided at the front and rear ends of the fixed valve body 7, and a fixing part 9 is fixedly provided on the fixed valve body 7, and a plurality of openings for passing water are provided on the fixed part 9, and a check part 10 and a check part 2 11 are provided at the front and rear ends of the check piece 8, and the check piece 8 slides on the fixed part 9, so that the water holes at the front and rear ends are closed and circulate.

[0018] To be more specific, when the gate valve body 1 is in the open state, liquid enters from the water inlet pipe 2 of the gate valve body 1 and is filtered through the check valve assembly 6 and the filter screen 15 at the water inlet pipe 2, pushing the check part 10 and the check part 2 11, so that the check valve assembly 6 is in the flow state, and finally flows out from the water outlet pipe 3. When the gate valve body 1 is closed, the return spring in the compressed state rebounds, and the check part 10 and the check part 2 11 are pressed against the fixed valve body 7 again, thereby preventing liquid backflow.

[0019] To be more specific, a fixing ring 12 is provided on the water flow part, and a connecting spring 13 is provided between the fixing ring 12 and the fixing part 9. Through the connecting spring 13, the check member 81 and the check member 82 are respectively matched with the water flow holes provided at the front and rear ends, thereby preventing the liquid from returning.

[0020] In further detail, a connecting portion 14 is protruded from the rear end portion of the fixed valve body 7 , and a filter screen 15 for filtering is provided on the connecting portion 14 .

[0021] To be more specific, an O-ring is provided between the union cap 5 and the water inlet pipe 2 , and an O-ring is provided between the octagonal cap 16 and the water outlet pipe 3 .

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0023] Although this document frequently uses terms such as gate valve body 1, water inlet pipe 2, water outlet pipe 3, gate valve plate 4, union cap 5, check valve assembly 6, fixed valve body 7, check member 8, fixed portion 9, check portion 1 10, check portion 2 11, fixed ring 12, connecting spring 13, connecting portion 14, filter screen 15, octagonal cap 16, and joint 17, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A non-return flexible gate valve, comprising a gate valve body (1), wherein a water inlet pipe (2) and a water outlet pipe (3) are provided in the gate valve body (1), and a gate valve plate (4) for controlling liquid flow is provided in the gate valve body (1), characterized in that: The water inlet pipe (2) is flexibly connected to a connecting pipe through a flexible cap (5), and the water outlet pipe (3) is connected to a joint (17) through an octagonal cap (16). A check valve assembly (6) with a double check function is provided in the water inlet pipe (2). The check valve assembly (6) is composed of a fixed valve body (7) and a check member (8). Water holes for passing water are provided at both the front and rear ends of the fixed valve body (7). A fixed portion (9) is fixedly provided on the fixed valve body (7). A plurality of openings for passing water are provided on the fixed portion (9). A check portion 1 (10) and a check portion 2 (11) are provided at both the front and rear ends of the check member (8). The check member (8) slides on the fixed portion (9), thereby closing and allowing the water holes at the front and rear ends to flow.

2. A non-return flexible joint gate valve according to claim 1, characterized in that: A fixing ring (12) is provided on the water-passing member, and a connecting spring (13) is provided between the fixing ring (12) and the fixing portion (9). The connecting spring (13) enables the first and second check members (8) to respectively cooperate with the water-passing holes provided at the front and rear ends, thereby preventing the liquid from returning.

3. A non-return movable gate valve according to claim 1, characterized in that: A connecting portion (14) is protruding from the rear end portion of the fixed valve body (7), and a filter screen (15) for filtering is provided on the connecting portion (14).

4. A non-return flexible joint gate valve according to claim 1, characterized in that: An O-ring is provided between the flexible joint cap (5) and the water inlet pipe (2), and an O-ring is provided between the octagonal cap (16) and the water outlet pipe (3).

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