Wafer type ball valve

Abstract

The utility model relates to the technical field of valves, and discloses a wafer type ball valve which comprises a valve body, a ball core and a split type valve rod. The ball core is arranged in a ball cavity of the valve body in a press-fitting mode. The split type valve rod comprises a connecting block and a valve rod body, one end of the valve rod body extends into the ball cavity of the valve body and is connected with the ball core through the connecting block, and the other end of the valve rod body penetrates through the packing hole of the valve body and is fixed through a packing gland. According to the wafer type ball valve, through the design of the split type valve rod, the problem of built-in installation of the valve rod of the wafer type ball valve with the small drift diameter specification is solved, the wafer type ball valve can be suitable for wafer type ball valves with different specifications, and the wafer type ball valve has wide market prospects; and through internal installation of the connecting block and the sealing gasket, when fluid passes through the valve body, the self-locking sealing effect is achieved through fluid pressure, and the problem of leakage caused by high internal pressure of the valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a wafer-type ball valve. Background Art

[0002] Ball valves are mainly used for regulating and controlling fluid medium pipelines in industries such as petroleum, chemical, electric power, papermaking, medicine, and food. Ball valves are easy to operate, and only need to rotate the valve stem 90 degrees to open and close the valve. They are widely used in all aspects of national economic life.

[0003] Ball valves are mainly divided into flanged ball valves and wafer-type ball valves according to the installation form. There are usually two ways to install the valve stem of wafer-type ball valves, one is to install it in the ball cavity, called internal installation, and the other is to install it through the packing hole, called external installation.

[0004] The external valve stem has a simple structure and is relatively easy to assemble. It is generally used in low-pressure and medium-pressure working scenarios. Since the fluid in the valve chamber has outward pressure, there is a risk that the valve stem will be ejected. In order to deal with this risk, the commonly used technical solution is to use a packing gland to press the valve handle and packing onto the valve body, while applying a pre-locking force to the valve handle. With the passage of time and changes in the working conditions of the valve parts, the pre-locking force of the packing gland will change and weaken, and manual adjustment is required; if the pre-locking force is too light, medium leakage will occur, and if the pre-locking force is too large, the valve stem will be locked and difficult to rotate.

[0005] The built-in valve stem is installed inside the ball cavity. The pressure generated by the fluid in the valve cavity presses the valve stem against the thrust surface in the valve body. This not only solves the positioning problem of the valve stem, so that the valve stem will not be pushed out by the internal pressure, but also produces a self-locking seal effect through the pressure of the fluid, which is suitable for high-pressure working scenarios. However, due to its compact structure, when the diameter of the ball valve is less than DN25, the valve stem is limited by material strength and process cost, and it is impossible to make the valve stem small enough to pass through the ball cavity for internal installation while ensuring its strength. Utility Model Content

[0006] In order to solve the technical problems existing in the background technology, the utility model provides a wafer-type ball valve.

[0007] The utility model provides a wafer-type ball valve, comprising a valve body, a ball core and a split valve stem;

[0008] The ball core is press-fitted into the ball cavity of the valve body;

[0009] The split valve stem includes a connecting block and a valve stem body. One end of the valve stem body extends into the ball cavity of the valve body and is connected to the ball core through the connecting block. The other end of the valve stem body passes through the packing hole of the valve body and is fixed by a packing gland.

[0010] As a further optimized solution of the utility model, one side of the connecting block is connected to the valve stem body key, and the other side of the connecting block is connected to the ball core key.

[0011] As a further optimized solution of the utility model, an extension rod is installed at one end of the valve stem body away from the connecting block, the outer diameter of the extension rod is smaller than the outer diameter of the valve stem body, one end of the extension rod extends into the packing hole and forms a step with the end face of the valve stem body, the packing gland is threadedly mounted on the opening of the packing hole, the packing gland is mounted on the periphery of the extension rod and is aligned with the extension rod and has a gap.

[0012] As a further optimized solution of the utility model, the inner diameter of the packing gland is smaller than the outer diameter of the valve stem body, and there is a gap between the end surface of the packing gland located in the packing hole and the step surface of the valve stem body.

[0013] As a further optimized solution of the utility model, the outer wall of the extension rod has a thread, and a handle is sleeved on the extension rod and locked by a nut.

[0014] As a further optimized solution of the utility model, the outer wall thread of the extension rod has a rectangular cross-section, the handle has a sleeve hole adapted to the extension rod, the handle is sleeved with the extension rod through the sleeve hole and circumferentially limited, and the nut thread is sleeved on the extension rod and abuts against the handle.

[0015] As a further optimized solution of the utility model, a packing is arranged in the packing hole of the valve body, and one end of the packing gland located in the packing hole abuts against the packing.

[0016] As a further optimized solution of the utility model, a side of the connecting block away from the ball core is sealed and connected to the top wall of the ball cavity of the valve body through a sealing gasket.

[0017] As a further optimized solution of the utility model, it also includes a valve seat and a valve cover. There are two valve seats, which are respectively arranged at the openings on both sides of the ball core. The valve cover abuts against one of the valve seats and is fixed to the valve body by fasteners.

[0018] The wafer-type ball valve proposed by the utility model has the following beneficial effects:

[0019] (1) The split valve stem design solves the problem of valve stem internal installation of small-diameter wafer-type ball valves, and can be applied to wafer-type ball valves of different specifications, with broad market prospects;

[0020] (ii) By installing the connecting block and the sealing gasket, when the fluid passes through the valve body, the fluid pressure is used to produce a self-locking sealing effect, thereby avoiding the problem of valve leakage due to high internal pressure;

[0021] (iii) The keyway connection between the valve stem body and the connecting block ensures that the locking and fixing of the valve stem body will not lock the connecting block and the ball core, thereby reducing the adverse effects on the opening and closing of the valve;

[0022] (iv) The split valve stem design allows the valve stem to be free from the restrictions of the valve body installation cavity, and the valve stem strength can be enhanced by increasing the valve stem diameter;

[0023] (V) Through the design of the split valve stem, when the valve stem fails and needs to be replaced, only the corresponding valve stem body or connecting block needs to be replaced, without the need for overall replacement, which can reduce material waste, save costs, and have greater economic benefits.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0027] Description of the drawings: 10, valve body; 20, ball core; 21, valve seat; 22, valve cover; 31, connecting block; 32, valve stem body; 33, sealing gasket; 40, packing; 41, packing gland; 51, handle; 52, nut. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] See also Figure 1 and Figure 2 , a wafer-type ball valve, comprising a valve body 10, a ball core 20 and a split valve stem;

[0034] The ball core 20 is press-fitted into the ball cavity of the valve body 10;

[0035] The split valve stem includes a connecting block 31 and a valve stem body 32. One end of the valve stem body 32 extends into the ball cavity of the valve body 10 and is connected to the ball core 20 through the connecting block 31. The other end of the valve stem body 32 passes through the packing hole of the valve body 10 and is fixed by a packing gland 41.

[0036] Specifically, one side of the connection block 31 is key-connected to the valve stem body 32, and the other side of the connection block 31 is key-connected to the ball core 20;

[0037] like Figure 2As shown, the upper end surfaces of the connecting block 31 and the ball core 20 are provided with key slots, and the lower end surfaces of the valve stem body 32 and the connecting block 31 are provided with matching keys. Through the plugging of the key and the key slot, the split valve stem can be quickly assembled, and the valve stem and the ball core 20 can be docked.

[0038] Furthermore, the keyway between the connecting block 31 and the valve stem body 32 is a quadrangular keyway, and correspondingly, the lower end surface of the valve stem body 32 has a quadrangular key;

[0039] Furthermore, the keyway between the connecting block 31 and the ball core 20 is a triangular keyway, and correspondingly, the lower end surface of the connecting block 31 has a triangular key;

[0040] Specifically, an extension rod is installed at one end of the valve stem body 32 away from the connecting block 31, and the outer diameter of the extension rod is smaller than the outer diameter of the valve stem body 32. One end of the extension rod extends into the packing hole and forms a step with the end surface of the valve stem body 32. The packing gland 41 is threadedly sleeved on the opening of the packing hole. The packing gland 41 is sleeved on the periphery of the extension rod and is aligned with the extension rod with a gap. With such a design, the extension rod can drive the valve stem body 32, the connecting block 31 and the ball core 20 to rotate synchronously, so as to adjust the opening and closing of the valve.

[0041] Furthermore, a packing 40 is arranged in the packing hole of the valve body 10, and one end of the packing gland 41 located in the packing hole abuts against the packing 40. By rotating the packing gland 41, the packing gland 41 squeezes the packing 40 in the packing hole, thereby improving the tightness of the packing 40, which is beneficial to improving the sealing performance;

[0042] Furthermore, the filler 40 is formed by stacking a plurality of polytetrafluoroethylene gaskets and flexible graphite;

[0043] Furthermore, the inner diameter of the packing gland 41 is smaller than the outer diameter of the valve stem body 32, and there is a gap between the end surface of the packing gland 41 located in the packing hole and the step surface of the valve stem body 32. Such a design can provide a certain axial limit to the valve stem body 32 to prevent the valve stem body 32 from coming out of the packing hole. It should be noted that due to the slight gap between the packing gland 41 and the step surface, the valve stem body 32 is not affected by the packing gland 41 when rotating, but the valve stem body 32 may undergo slight axial displacement, but the impact on the normal use of the valve can be ignored.

[0044] Furthermore, the outer wall of the extension rod has threads, and a handle 51 is mounted on the extension rod and is locked by a nut 52;

[0045] Furthermore, the outer wall thread of the extension rod has a rectangular section, the handle 51 has a sleeve hole adapted to the extension rod, the handle 51 is sleeved with the extension rod through the sleeve hole and circumferentially limited, and the nut 52 is threadedly sleeved on the extension rod and abuts against the handle 51;

[0046] The inner wall of the sleeve hole has a plane corresponding to the rectangular section, so that the handle 51 can be sleeved on the extension rod and it is difficult for the two to rotate relative to each other, so that the handle 51 can drive the extension rod and the valve stem body 32 to rotate synchronously;

[0047] Further, there is a gap between the bottom end of the rectangular section and the upper end surface of the packing gland 41, so that the handle 51 can rotate without being affected by the packing gland 41;

[0048] Specifically, the side of the connecting block 31 away from the ball core 20 is sealed and connected to the top wall of the ball cavity of the valve body 10 through the sealing gasket 33;

[0049] Furthermore, the top wall of the ball cavity of the valve body 10 has a groove adapted to the connection block 31, the upper end of the connection block 31 is inserted into the groove, and the end faces of both sides of the sealing gasket 33 are respectively in close contact with the upper end face of the connection block 31 and the top wall of the ball cavity, which can improve the actual sealing performance;

[0050] When the pressure of the fluid in the valve is high, the connection block 31 will be pushed up, thereby squeezing the sealing gasket 33. The sealing gasket 33 is made of elastic materials such as rubber or silicone. The elastic deformation of the sealing gasket 33 can improve the actual sealing performance and prevent fluid leakage.

[0051] Specifically, it also includes a valve seat 21 and a valve cover 22. There are two valve seats 21, which are respectively arranged at the openings on both sides of the ball core 20. The valve cover 22 abuts against one of the valve seats 21 and is fixed to the valve body 10 through fasteners.

[0052] Furthermore, the valve body 10, the ball core 20, the valve cover 22, the connecting block 31, the valve stem body 32, and the packing gland 41 are all made of carbon steel or stainless steel;

[0053] Furthermore, the valve seat 21 and the sealing gasket 33 are both made of polytetrafluoroethylene;

[0054] In summary, the wafer-type ball valve proposed in the utility model solves the problem of stem internal installation of wafer-type ball valves with small diameter specifications through the design of a split valve stem, and can be applied to wafer-type ball valves of different specifications, with broad market prospects; through the internal installation of the connecting block 31 and the sealing gasket 33, when the fluid passes through the valve body 10, the fluid pressure is used to produce a self-locking sealing effect, thereby avoiding the problem of valve leakage due to high internal pressure; through the keyway connection between the valve stem body 32 and the connecting block 31, the locking and fixing of the valve stem body 32 will not lock the connecting block 31 and the ball core 20, thereby reducing the adverse effect on the opening and closing of the valve; through the design of the split valve stem, the valve stem is not restricted by the installation cavity of the valve body 10, and the valve stem strength can be enhanced by increasing the valve stem diameter; through the design of the split valve stem, when the valve stem fails and needs to be replaced, only the corresponding valve stem body 32 or the connecting block 31 needs to be replaced, without the need for overall replacement, which can reduce material waste, save costs, and have greater economic benefits.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wafer-type ball valve, characterized in that: It comprises a valve body (10), a ball core (20) and a split valve stem; The ball core (20) is press-fitted into the ball cavity of the valve body (10); The split valve stem comprises a connecting block (31) and a valve stem body (32), one end of the valve stem body (32) extends into the ball cavity of the valve body (10) and is connected to the ball core (20) through the connecting block (31), and the other end of the valve stem body (32) passes through the packing hole of the valve body (10) and is fixed by a packing gland (41).

2. A wafer-type ball valve according to claim 1, characterized in that: One side of the connection block (31) is key-connected to the valve stem body (32), and the other side of the connection block (31) is key-connected to the ball core (20).

3. A wafer-type ball valve according to claim 1, characterized in that: An extension rod is installed at one end of the valve stem body (32) away from the connecting block (31), the outer diameter of the extension rod is smaller than the outer diameter of the valve stem body (32), one end of the extension rod extends into the packing hole and forms a step with the end surface of the valve stem body (32), the packing gland (41) is threadedly mounted on the opening of the packing hole, the packing gland (41) is sleeved on the periphery of the extension rod and is aligned with the extension rod and has a gap.

4. A wafer-type ball valve according to claim 3, characterized in that: The inner diameter of the packing gland (41) is smaller than the outer diameter of the valve stem body (32), and there is a gap between the end surface of the packing gland (41) located in the packing hole and the step surface of the valve stem body (32).

5. The wafer-type ball valve according to claim 3, characterized in that: The outer wall of the extension rod is provided with threads, and a handle (51) is sleeved on the extension rod and is locked by a nut (52).

6. A wafer-type ball valve according to claim 5, characterized in that: The outer wall thread of the extension rod has a rectangular section, the handle (51) has a sleeve hole matched with the extension rod, the handle (51) is sleeved with the extension rod through the sleeve hole and circumferentially limited, and the nut (52) is threadedly sleeved on the extension rod and abuts against the handle (51).

7. The wafer-type ball valve according to claim 1, characterized in that: A packing (40) is arranged in the packing hole of the valve body (10), and one end of the packing gland (41) located in the packing hole abuts against the packing (40).

8. The wafer-type ball valve according to claim 1, characterized in that: The side of the connection block (31) away from the ball core (20) is sealed and connected to the top wall of the ball cavity of the valve body (10) via a sealing gasket (33).

9. The wafer-type ball valve according to claim 1, characterized in that: It also includes a valve seat (21) and a valve cover (22). There are two valve seats (21) and they are respectively arranged at the openings on both sides of the ball core (20). The valve cover (22) abuts against one of the valve seats (21) and is fixed to the valve body (10) via a fastener.

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