Front sealing tank bottom valve without retention valve

Abstract

The utility model discloses a front sealing tank bottom valve without a retention valve, which relates to the technical field of sealing tank bottom valves and comprises a valve body, the left side of the valve body is fixedly connected with a left flange, the right side of the valve body is provided with a right flange, the top of the valve body is fixedly connected with a valve cover, and the inner side of the valve cover is movably connected with a valve rod. The ball valve is characterized in that the top of the valve rod is fixedly connected with a rotating handle, the bottom end of the valve rod is fixedly connected with a connecting column, and the bottom of the connecting column is movably connected with a valve element. When the valve is closed, the direction of the ball groove is changed to be horizontal with the flowing direction of the ball body, when the valve is closed, the direction of the ball groove is perpendicular to the flow channel of the valve body, the ball body is further fixed, the medium cannot enter the isolation cavity, and in addition, due to fixation of the ball body, under the combined action of spring force and medium pressure, front-valve sealing can be achieved like a fixed ball valve.

Description

Technical Field

[0001] The utility model relates to the technical field of sealed tank bottom valves, in particular to a bottom valve of a sealed tank without retention before the valve. Background Art

[0002] A bottom valve is a check valve, which means a valve whose opening and closing part is a circular valve flap and blocks the reverse flow of the medium by its own weight and the pressure of the medium. It belongs to the category of automatic valves and is also called a check valve, one-way valve, reflux valve or isolation valve. The movement mode of the valve flap is divided into lift type and swing type. The lift check valve is similar in structure to the globe valve, only lacking the valve stem that drives the valve flap. The medium enters from the inlet end (the swing check valve has an inclined valve flap that can rotate around the axis, and its working principle is similar to that of the lift check valve). The check valve is commonly used as the bottom valve of the pumping device to prevent the backflow of water. When the check valve is used in combination with the globe valve, it can play a role in safety isolation. However, its disadvantages are large resistance and poor sealing performance when closed.

[0003] In the traditional floating ball tank bottom valve, a medium isolation cavity is formed between the outer edge of the ball and the inner cavity of the valve body. After the valve is closed, the medium remains in the isolation cavity and the flow channel of the ball, resulting in pollution during the subsequent pipeline operation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a bottom valve of a sealed tank without retention before the valve, so as to solve the problem that in the existing traditional floating ball tank bottom valve, a medium isolation cavity is formed between the outer circle of the ball and the inner cavity of the valve body, and the medium remains in the isolation cavity and the flow channel of the ball after the valve is closed, resulting in pollution during the subsequent pipeline operation.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a bottom valve of a sealed tank without retention before the valve, including a valve body. A left flange is fixedly connected to the left side of the valve body, and a right flange is provided on the right side of the valve body. A valve cover is fixedly connected to the top of the valve body. A valve stem is movably connected to the inside of the valve cover. A turning handle is fixedly connected to the top of the valve stem, and a connecting column is fixedly connected to the bottom end of the valve stem. A valve core is movably connected to the bottom of the connecting column, and a convex rod is fixedly connected to the bottom of the connecting column. For the bottom valve of a sealed tank without retention before the valve, the conventional valve seat sealing ring is replaced with a full - package sealing ring. The valve seat in front of the valve uses PTFE material for soft sealing, and the valve seat behind the valve uses PEEK hard plastic for sealing. The ball is supported and fixed by the pre - tightening force of the valve seat. Then, the direction of the ball groove is changed so that the direction of the ball groove is horizontal with the flow direction of the ball. When the valve is closed, the direction of the ball groove is perpendicular to the flow channel of the valve body to further fix the ball, so that the medium will not enter the isolation cavity. In addition, due to the fixation of the ball, the front of the valve can achieve pre - valve sealing under the combined action of the spring force and the medium pressure, just like a fixed - type ball valve.

[0006] As a preferred technical solution of the utility model, the side surface of the left flange is fixedly connected to the right flange through a connecting screw.

[0007] As a preferred technical solution of the present utility model, the side surface of the connecting column is movably connected to the inner side of the valve cover through a bearing ring.

[0008] As a preferred technical solution of the present utility model, a ball groove is formed at the top of the valve core, and the inner side of the ball groove is clamped with the side surface of the convex rod.

[0009] As a preferred technical solution of the present utility model, two channels are formed on the side surface of the valve core; the valve realizes pre-valve sealing, so an opening can be made in the direction of the sphere outlet, so that the medium remaining in the sphere flow channel during the closing process of the valve can flow away without internal leakage. The problem of medium residue in the isolation cavity and the sphere flow channel is solved, thus realizing no retention.

[0010] As a preferred technical solution of the present utility model, PEEK rigid plastic is provided on the side surface of the valve core and located inside the valve body.

[0011] As a preferred technical solution of the present utility model, disc springs are provided on the inner side of the valve body and located on the side surface of the PEEK rigid plastic, and the number of the disc springs is two.

[0012] As a preferred technical solution of the present utility model, a second sealing ring and a first sealing ring are respectively provided on the inner side and the outer side of the PEEK rigid plastic.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model uses a bottom valve with pre-valve sealing without retention, replaces the conventional valve seat sealing ring with a full-coverage sealing ring, the pre-valve seat uses PTFE material for soft sealing, the post-valve seat uses PEEK rigid plastic for sealing, and the sphere is pressed and fixed by the pre-tightening force of the valve seat. Then, the direction of the ball groove is changed so that the direction of the ball groove is horizontal with the flow direction of the sphere. When the valve is closed, the direction of the ball groove is perpendicular to the flow channel of the valve body to further fix the sphere, so that the medium will not enter the isolation cavity. In addition, due to the fixation of the sphere, the pre-valve can achieve pre-valve sealing like a fixed ball valve under the combined action of the spring force and the medium pressure.

[0015] 2. The present utility model realizes pre-valve sealing through the valve, so an opening can be made in the direction of the sphere outlet, so that the medium remaining in the sphere flow channel during the closing process of the valve can flow away without internal leakage, and the problem of medium residue in the isolation cavity and the sphere flow channel is solved, thus realizing no retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the main structural view of the present utility model;

[0017] Figure 2 is the partial enlarged view of part A of the structure of the present utility model;

[0018] Figure 3 This is the structural spool valve diagram of the present utility model.

[0019] In the figure: 1. Valve body; 2. Left flange; 3. Connecting screw; 4. Right flange; 5. Valve cover; 6. Valve stem; 7. Rotating handle; 8. Connecting column; 9. Bearing ring; 10. Convex rod; 11. Spool valve; 12. Ball groove; 13. PEEK hard plastic; 14. Channel; 15. Seal ring one; 16. Seal ring two; 17. Disc spring. Specific implementation mode

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-3 , the present utility model provides a bottom valve for a non-retention valve front seal tank, including a valve body 1. A left flange 2 is fixedly connected to the left side of the valve body 1, and a right flange 4 is provided on the right side of the valve body 1. A valve cover 5 is fixedly connected to the top of the valve body 1. A valve stem 6 is movably connected to the inside of the valve cover 5. A rotating handle 7 is fixedly connected to the top of the valve stem 6, and a connecting column 8 is fixedly connected to the bottom end of the valve stem 6. A spool valve 11 is movably connected to the bottom of the connecting column 8, and a convex rod 10 is fixedly connected to the bottom of the connecting column 8. For the bottom valve of the non-retention valve front seal tank, the conventional valve seat seal ring is replaced with a full-wrap seal ring. The valve front valve seat uses PTFE material for soft seal, and the valve rear valve seat uses PEEK hard plastic 13 for seal. The sphere is supported and fixed by the pre-tightening force of the valve seat. Then, the direction of the ball groove 12 is changed so that the direction of the ball groove 12 is horizontal with the flow direction of the sphere. When the valve is closed, the direction of the ball groove 12 is perpendicular to the flow channel of the valve body 1 to further fix the sphere, so that the medium will not enter the isolation chamber. In addition, due to the fixation of the sphere, under the combined action of the spring force and the medium pressure in front of the valve, valve front seal can be achieved as in a fixed ball valve.

[0022] In summary, by using a bottom valve of a front-sealed tank without a retention valve, replacing the conventional valve seat sealing ring with a full-encapsulation sealing ring, using PTFE material for soft sealing of the valve seat in front of the valve, and using PEEK hard plastic for sealing of the valve seat behind the valve, the sphere is held firmly in place by the pre-tightening force of the valve seat. Then, by changing the direction of the ball groove 12 so that the direction of the ball groove 12 is horizontal to the flow direction of the sphere, when the valve is closed, the direction of the ball groove 12 is perpendicular to the flow channel of the valve body 1 to further fix the sphere, preventing the medium from entering the isolation chamber. Additionally, due to the fixation of the sphere, the valve can achieve front-seat sealing under the combined action of the spring force and the medium pressure in front of the valve, similar to a fixed ball valve. Since the valve has achieved front-seat sealing, an opening can be made in the direction of the sphere outlet, allowing the medium remaining in the sphere flow channel during the valve closing process to flow away without internal leakage, solving the problem of medium residue in the isolation chamber and the sphere flow channel, thus achieving no retention. This solves the problem of medium residue in the medium isolation chamber formed between the outer circle of the sphere and the inner cavity of the valve body 1 in the existing traditional floating ball bottom valve, and the pollution generated during the subsequent pipeline operation due to the medium residue in the isolation chamber and the sphere flow channel after the valve is closed.

[0023] The side of the left flange 2 is fixedly connected to the right flange 4 through the connecting screw 3. The side of the connecting column 8 is movably connected to the inside of the valve cover 5 through the bearing ring 9. The top of the valve core 11 is provided with a ball groove 12, and the inside of the ball groove 12 is clamped with the side of the convex rod 10. The side of the valve core 11 is provided with two channels 14. Since the valve has achieved front-seat sealing, an opening can be made in the direction of the sphere outlet, allowing the medium remaining in the sphere flow channel during the valve closing process to flow away without internal leakage, solving the problem of medium residue in the isolation chamber and the sphere flow channel, thus achieving no retention.

[0024] The side of the valve core 11 is provided with PEEK hard plastic 13 inside the valve body 1. The inside of the valve body 1 is provided with two disc springs 17 on the side of the PEEK hard plastic 13. Sealing rings two 16 and sealing rings one 15 are respectively provided on the inside and outside of the PEEK hard plastic 13.

[0025] During specific use, first, for the bottom valve of the front seal tank without a retention valve, replace the conventional valve seat sealing ring with a full-wrap sealing ring. The valve seat in front of the valve uses PTFE material for soft sealing, and the valve seat behind the valve uses PEEK hard plastic for sealing. The sphere is held firmly in place by the pre-tightening force of the valve seat. Then, change the direction of the ball groove 12 so that the direction of the ball groove 12 is horizontal to the flow direction of the sphere. When the valve is closed, the direction of the ball groove 12 is perpendicular to the flow channel of the valve body 1 to further fix the sphere, preventing the medium from entering the isolation chamber. Additionally, due to the fixation of the sphere, the valve can achieve front-seat sealing under the combined action of the spring force and the medium pressure in front of the valve, similar to a fixed ball valve. Since the valve achieves front-seat sealing, an opening can be made in the direction of the sphere outlet, allowing the medium retained in the sphere flow channel to flow away during the valve closing process without internal leakage, solving the problem of medium residue in the isolation chamber and the sphere flow channel, thus achieving no retention.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-retention front-sealed tank bottom valve, comprising a valve body (1), characterized in that: The left side of the valve body (1) is fixedly connected to a left flange (2), and the right side of the valve body (1) is provided with a right flange (4), and the top of the valve body (1) is fixedly connected to a valve cover (5), the inner side of the valve cover (5) is movably connected to a valve stem (6), the top of the valve stem (6) is fixedly connected to a turning handle (7), and the bottom end of the valve stem (6) is fixedly connected to a connecting column (8), the bottom of the connecting column (8) is movably connected to a valve core (11), and the bottom of the connecting column (8) is fixedly connected to a convex rod (10).

2. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: The side surface of the left flange (2) is fixedly connected to the right flange (4) via a connecting screw (3).

3. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: The side surface of the connecting column (8) is movably connected to the inner side of the valve cover (5) via a bearing ring (9).

4. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: A ball groove (12) is provided on the top of the valve core (11), and the inner side of the ball groove (12) is clamped with the side surface of the protruding rod (10).

5. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: The side surface of the valve core (11) is provided with channels (14), and there are two channels (14).

6. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: The side surface of the valve core (11) is provided with a PEEK hard plastic (13) located inside the valve body (1).

7. The tank bottom valve without a retention valve front seal according to claim 1, characterized in that: The inner side of the valve body (1) is provided with a disc spring (17) located on the side of the PEEK hard plastic (13), and the number of the disc springs (17) is two.

8. The tank bottom valve without a retention valve front seal according to claim 6, characterized in that: The inner side and outer side of the PEEK hard plastic (13) are respectively provided with a second sealing ring (16) and a first sealing ring (15).

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