Self-tasting bidirectional double-sealing ball valve

Abstract

The utility model provides a self-compensation bidirectional double-sealing ball valve which comprises a valve body and a ball body, valve seats are fixedly installed at an inlet and an outlet in the valve body respectively, and a valve rod is rotatably installed on the valve body; the ball body is rotationally mounted in the valve body, is positioned between the two valve seats, and is rotationally connected with the two valve seats; the ball body is fixedly connected with the bottom end of the valve rod; a valve seat gland is fixedly mounted at an inlet of the valve body; by means of the integral arrangement, when abrasion occurs between the inner valve seat and the ball body, the middle seat and the outer valve seat can force the outer valve seat to make contact with the ball body automatically under the pressure of a conveying medium, and therefore compensation sealing is carried out, the integral sealing performance is effectively improved, and the service life is effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of ball valves, and in particular relates to a self-compensating bidirectional double-sealed ball valve. Background Art

[0002] Ball valve, the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. The hard-sealed V-type ball valve has a strong shear force between its V-type ball core and the metal valve seat with hard alloy surfacing, which is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium on the pipeline, but also close any channel to connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. Ball valves are divided into: pneumatic ball valves, electric ball valves, and manual ball valves according to the driving method.

[0003] However, in the process of opening and closing, friction will occur between the ball and the ball seat of the existing ball valve, which is prone to wear over time, thereby affecting the overall sealing and service life.

[0004] Therefore, it is very necessary to invent a self-compensating two-way double-sealed ball valve. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a self-compensating bidirectional double-sealed ball valve adopts the following technical solution: a self-compensating bidirectional double-sealed ball valve, comprising a valve body and a ball, wherein: a valve seat is fixedly installed at the inlet and outlet of the valve body, and a valve stem is rotatably installed on the valve body; the ball is rotatably installed inside the valve body, and the ball is located between the two valve seats, and the ball is rotatably connected to the two valve seats; the ball is fixedly connected to the bottom end of the valve stem; a valve seat gland is fixedly installed at the inlet of the valve body;

[0006] Preferably, the valve seat comprises an inner valve seat, an intermediate seat and an outer valve seat, and the outer side of the inner valve seat is fixedly mounted with an outer valve seat via the intermediate seat, and the inner valve seat, the intermediate seat and the outer valve seat are coaxial; the inner side of the inner valve seat is in rotational contact with the ball; the diameter of the inner valve seat is larger than the diameters of the intermediate seat and the outer valve seat, and the inner diameter of the inner valve seat at the smallest point matches the inner diameter of the intermediate seat; the diameter of the outer valve seat is larger than the diameter of the intermediate seat, and the inner diameter of the outer valve seat is smaller than the inner diameter of the intermediate seat; the inner valve seat, the intermediate seat and the outer valve seat are slidably mounted between the valve seat cover and the ball.

[0007] Preferably, a sealing packing and a packing gland are provided between the valve body and the valve stem.

[0008] Preferably, a handle is fixedly mounted on the top end of the valve stem, and the handle is rotatably connected to the valve body.

[0009] Preferably, the valve seat pressure cover includes an externally threaded ring seat, and an inner locating ring is fixedly installed on the inner side of the externally threaded ring seat, and the inner locating ring is coaxial with the externally threaded ring seat; the diameter of the externally threaded ring seat is larger than the diameter of the inner locating ring, and the inner diameter of the externally threaded ring seat is smaller than the inner diameter of the inner locating ring; the inner diameter of the inner locating ring matches the diameter of the inner valve seat; the inner diameter of the externally threaded ring seat matches the diameter of the outer valve seat; the inner valve seat is slidably installed in the inner locating ring; the intermediate seat and the outer valve seat are slidably installed in the externally threaded ring seat; the inner locating ring is fixedly installed at the inlet of the valve body through the externally threaded ring seat.

[0010] Preferably, a sealing ring is provided between the inner valve seat and the inner positioning ring.

[0011] Compared with the prior art, the advantages of the utility model are:

[0012] The overall arrangement of the utility model, when wear occurs between the inner valve seat and the ball, the middle seat and the outer valve seat can force the outer valve seat to automatically contact the ball under the pressure of the conveying medium, thereby performing compensatory sealing, thereby effectively improving the overall sealing and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a half-section structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the explosion structure of the valve seat and the valve seat gland of the utility model.

[0015] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure:

[0017] Valve body 1, valve stem 2, valve seat 3, inner valve seat 31, middle seat 32, outer valve seat 33, ball 4, valve seat gland 5, external threaded ring seat 51, inner positioning ring 52, handle 6. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0019] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Embodiment 1

[0022] Reference Figure 1-3 A self-compensating bidirectional double-sealed ball valve comprises a valve body 1 and a ball 4, wherein: a valve seat 3 is fixedly installed at the inlet and outlet of the valve body 1, and the arrangement of the valve seat 3 can ensure the smoothness and stability of the ball 4 during rotation, and at the same time ensure the sealing between the ball 4 and the valve body 1, and a valve stem 2 is rotatably installed on the valve body 1; the ball 4 is rotatably installed inside the valve body 1, and the ball 4 is between two valve seats 3, and the ball 4 is rotatably connected to the two valve seats 3; the ball 4 is fixedly connected to the bottom end of the valve stem 2; a valve seat gland 5 is fixedly installed at the inlet of the valve body 1;

[0023] The valve seat 3 includes an inner valve seat 31, an intermediate seat 32 and an outer valve seat 33, and the outer side of the inner valve seat 31 is fixedly mounted with the outer valve seat 33 through the intermediate seat 32. The inner valve seat 31 can always fit with the ball 4 to ensure the sealing between the ball 4. The inner valve seat 31, the intermediate seat 32 and the outer valve seat 33 are coaxial. When wear occurs between the inner valve seat 31 and the ball 4, the intermediate seat 32 and the outer valve seat 33 can contact with the ball 4 under the pressure of the conveying medium, thereby 4 for compensating sealing; the inner side of the inner valve seat 31 is in rotational contact with the ball 4; the diameter of the inner valve seat 31 is larger than the diameters of the middle seat 32 and the outer valve seat 33, and the inner diameter of the smallest part of the inner valve seat 31 matches the inner diameter of the middle seat 32; the diameter of the outer valve seat 33 is larger than the diameter of the middle seat 32, and the inner diameter of the outer valve seat 33 is smaller than the inner diameter of the middle seat 32; the inner valve seat 31, the middle seat 32 and the outer valve seat 33 are slidably mounted between the valve seat gland 5 and the ball 4; the inner diameter of the outer valve seat 33 matches the inner diameter of the through hole on the ball 4;

[0024] It should be noted that when there is no wear on the contact portion between the inner valve seat 31 and the ball 4, the middle seat 32 and the outer valve seat 33 do not contact the ball 4. In this way, during the opening or closing process of the ball 4, the ball 4 will not wear against the middle seat 32 and the outer valve seat 33, thereby improving the overall service life.

[0025] A sealing packing and a packing gland are provided between the valve body 1 and the valve stem 2. The setting of the sealing packing and the packing gland can ensure the sealing between the valve body 1 and the valve stem 2. A handle 6 is fixedly installed on the top of the valve stem 2, and the handle 6 is rotatably connected to the valve body 1. Through the setting of the handle 6, a force point can be provided for the operator when opening or closing the ball 4.

[0026] The valve seat gland 5 includes an externally threaded ring seat 51, through which the valve seat gland 5 and the valve body 1 can be easily disassembled and assembled, so as to maintain and repair the ball 4 and the valve seat 3 at a later time, and an inner positioning ring 52 is fixedly installed on the inner side of the externally threaded ring seat 51. The stability between the valve seat 3 and the ball 4 can be ensured by the setting of the inner positioning ring 52, and the inner positioning ring 52 is coaxial with the externally threaded ring seat 51; the diameter of the externally threaded ring seat 51 is larger than the diameter of the inner positioning ring 52, and the inner diameter of the externally threaded ring seat 51 is smaller than the inner diameter of the inner positioning ring 52; the inner diameter of the inner positioning ring 52 matches the diameter of the inner valve seat 31; the inner diameter of the externally threaded ring seat 51 matches the diameter of the outer valve seat 33; the inner valve seat 31 is slidably installed in the inner positioning ring 52; the intermediate seat 32 and the outer valve seat 33 are slidably installed in the externally threaded ring seat 51; the inner positioning ring 52 is fixedly installed at the inlet of the valve body 1 through the externally threaded ring seat 51.

[0027] A sealing ring is provided between the inner valve seat 31 and the inner positioning ring 52 . The sealing ring ensures the sealing between the inner valve seat 31 and the inner positioning ring 52 .

[0028] In this embodiment, when in use, the self-compensating bidirectional double-sealed ball valve is fixedly installed on the required pipeline through the valve body 1. When the ball 4 needs to be opened, the valve stem 2 only needs to be rotated clockwise through the handle 6 until the through hole on the ball 4 coincides with the inlet and outlet on the valve body 1.

[0029] When the ball 4 needs to be closed, the valve stem 2 is simply rotated counterclockwise by the handle 6 until the through hole on the ball 4 is completely offset from the inlet and outlet on the valve body 1;

[0030] In the early stage, there is no wear between the ball 4 and the inner valve seat 31, and there is good sealing between them. Whether the ball 4 is opened or closed, the ball 4 will not contact the middle seat 32 and the outer valve seat 33, so that the middle seat 32 and the outer valve seat 33 can be prevented from being worn, thereby ensuring the service life of the middle seat 32 and the outer valve seat 33;

[0031] In the later stage, when wear occurs between the ball 4 and the inner valve seat 31, the pressure of the conveying medium can drive the middle seat 32 and the outer valve seat 33 to move to one side of the ball 4, forcing the inner valve seat 31 to contact the ball 4, thereby continuing to ensure the sealing between the ball 4 and the inner valve seat 31;

[0032] When the ball 4 and the inner valve seat 31 continue to wear and can no longer be sealed, the pressure of the conveying medium can drive the middle seat 32 and the outer valve seat 33 to move to one side of the ball 4, forcing the middle seat 32 and the outer valve seat 33 to contact the ball 4, thereby continuing to ensure the sealing between the ball 4. In this way, the overall service life and sealing effect are greatly improved, making the whole safer and more reliable.

[0033] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A self-compensating bidirectional double-sealed ball valve, characterized in that: The invention comprises a valve body (1) and a ball (4), wherein: a valve seat (3) is fixedly installed at the inlet and outlet of the valve body (1), and a valve stem (2) is rotatably installed on the valve body (1); the ball (4) is rotatably installed inside the valve body (1), and the ball (4) is located between two valve seats (3), and the ball (4) is rotatably connected to the two valve seats (3); the ball (4) is fixedly connected to the bottom end of the valve stem (2); a valve seat gland (5) is fixedly installed at the inlet of the valve body (1); The valve seat (3) comprises an inner valve seat (31), an intermediate seat (32) and an outer valve seat (33), and the outer side of the inner valve seat (31) is fixedly mounted with the outer valve seat (33) via the intermediate seat (32); the inner side of the inner valve seat (31) is in rotational contact with the ball (4); the inner valve seat (31), the intermediate seat (32) and the outer valve seat (33) are slidably mounted between the valve seat cover (5) and the ball (4).

2. A self-compensating bidirectional double-sealed ball valve as claimed in claim 1, characterized in that: A sealing packing and a packing gland are provided between the valve body (1) and the valve stem (2).

3. A self-compensating bidirectional double-sealed ball valve as claimed in claim 2, characterized in that: A handle (6) is fixedly mounted on the top end of the valve stem (2), and the handle (6) is rotatably connected to the valve body (1).

4. A self-compensating bidirectional double-sealed ball valve as claimed in claim 3, characterized in that: The valve seat gland (5) comprises an externally threaded ring seat (51), and an inner positioning ring (52) is fixedly installed on the inner side of the externally threaded ring seat (51); the inner valve seat (31) is slidably installed in the inner positioning ring (52); the intermediate seat (32) and the outer valve seat (33) are slidably installed in the externally threaded ring seat (51); the inner positioning ring (52) is fixedly installed at the inlet of the valve body (1) through the externally threaded ring seat (51).

5. A self-compensating bidirectional double-sealed ball valve as claimed in claim 4, characterized in that: A sealing ring is provided between the inner valve seat (31) and the inner positioning ring (52).

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