High-precision long-service-life fluorine-lined adjusting plug valve

Abstract

The utility model belongs to the technical field of plug valves, and particularly relates to a high-precision long-service-life fluorine lining adjusting type plug valve which comprises a valve body, a plug cock, a valve rod, a valve cover and an executing mechanism. A cavity is arranged in the middle of the valve body, the cock is arranged in the cavity in the valve body, flow channels for medium circulation are arranged in front of and behind the cavity, the middle of the cock is of a solid structure, a flow channel open groove of an involute structure is arranged on one side of the cock, and a fluorine lining structure layer is arranged on the surface of the cock. A hollow structure in the middle of a conventional plug cock is replaced by the flow channel open groove of the gradually-opened structure on one side edge of the plug cock, when the valve is opened, fluid conveyed in a pipeline can enter the flow channel open groove of the gradually-opened structure on the side edge of the plug cock, the medium conveying speed can be reduced along with the increase of the size of the flow channel in the valve body, and therefore the valve body is protected. The problem of strong impact of media in the opening and closing process of the plug valve is solved, and the service life of the fluorine-lined plug valve is effectively prolonged. And the characteristic flow curve of the plug valve can meet the linear function form, and high-precision flow adjustment is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plug valves, and in particular relates to a high-precision, long-life, fluorine-lined regulating plug valve. Background Art

[0002] The plug valve is an optimized structural form developed on the basis of the structure of the ball valve. It has the advantages of quick opening and closing, light weight, simple structure, easy maintenance, light weight and small fluid resistance. Therefore, it is widely used in pipeline transmission systems.

[0003] However, this structure has its inherent problems. On the one hand, the characteristic flow curve of the plug valve deviates from the linear range, so the flow control performance of the plug valve is not very good.

[0004] On the other hand, the middle part of the existing conventional plug valve adopts a hollow structure, and the strong medium impact force when the plug valve is opened and closed seriously affects its life. Summary of the invention

[0005] To solve the problems raised in the above background technology. The utility model provides a high-precision, long-life, fluorine-lined regulating plug valve, which replaces the hollow structure in the middle of a conventional plug with a flow channel groove with a gradually opening structure on one side of the plug. When the valve is opened, the fluid in the pipeline transmission will enter the flow channel groove with a gradually opening structure on the side of the plug. As the flow channel size inside the valve body increases, the transmission rate of the medium will decrease, so as to alleviate the strong impact of the medium faced by conventional plug valves during opening and closing, and effectively extend the life of the fluorine-lined plug valve. By optimizing the gradually opening structure design of the flow channel groove on the plug, the characteristic flow curve of the plug valve can meet the linear function form, realizing high-precision flow regulation.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-precision, long-life, fluorine-lined regulating plug valve, comprising a valve body, a plug, a valve stem, a valve cover and an actuator; a cavity is provided in the middle of the valve body, the plug is placed in the cavity inside the valve body, the front and rear of the cavity are flow channels for the flow of the medium, the middle of the plug is a solid structure, one side of the plug is provided with a flow channel groove of a gradually opening structure, and the surface of the plug is provided with a fluorine-lined structural layer;

[0007] The top of the plug is connected to the valve stem, a valve cover is installed on the top of the valve body, the valve stem passes through the valve cover and extends to the top of the valve body and is connected to an actuator installed above the valve cover; the actuator controls the opening and closing of the plug by twisting the valve stem.

[0008] As a preferred embodiment, the actuator includes a bracket, a transmission gear and a driving gear. The transmission gear is fixedly mounted on the upper end of the valve stem, the driving gear is mounted on the bracket and meshed with the transmission gear. An actuator for driving the driving gear to rotate is mounted on the top of the bracket.

[0009] As a preferred solution, flow channels for medium circulation are provided at both ends of the internal cavity of the valve body, a fluorine-lined structural layer is provided on the inner surface of the valve body, and connecting parts connected to the flow channels are provided at the left and right ends of the valve body. The valve body is connected to external pipe fittings through the connecting parts via a connecting mechanism.

[0010] As a preferred solution, the fluorine-lined structural layer material is PTFE, FEP, PFA, ETFE, PVDF, PCTFE and their modified and copolymerized products.

[0011] As a preferred solution, the connection mechanism is one of a flange connection, a ferrule connection, a welding connection, a clamp connection, a threaded connection and a clamp connection.

[0012] As a preferred solution, a valve seat is provided at the bottom of the internal cavity of the valve body, the bottom of the plug rests on the valve seat, a thrust washer is sleeved on the bottom end of the valve stem, the bottom of the thrust washer is tightly against the upper surface of the plug, a pressure cap is installed at the bottom end of the inside of the valve cover, and a sealing gasket is provided at the bottom end of the pressure cap, and a sealing packing pressure cap is provided at the connection between the middle part of the valve cover and the valve stem.

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

[0014] The utility model utilizes an actuator to drive the valve stem to drive the plug to rotate in the internal cavity of the valve body to realize the opening and closing of the plug valve; the hollow structure in the middle of the conventional plug is replaced by a flow channel groove with a gradually opening structure on one side of the plug. When the valve is opened, the fluid in the pipeline transmission will enter the internal cavity of the valve body from the connecting part, and then enter the flow channel groove with the gradually opening structure on the side of the plug. As the flow channel size of the medium flowing inside the valve body increases, the transmission rate of the medium will decrease, so as to alleviate the problem of strong impact of the medium faced by the conventional plug valve during the opening and closing process, and effectively prolong the service life of the fluorine-lined plug valve.

[0015] At the same time, by designing and optimizing the gradually opening structure of the flow channel groove on the plug, the characteristic flow curve of the plug valve can meet the linear function form, thereby achieving high-precision flow regulation.

[0016] By providing a fluorine lining structure layer on the surface of the plug and the inner surface of the valve body, all positions in contact with the material are provided with a fluorine lining structure layer, which plays a role in corrosion resistance and improves the service life of the plug valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a front view structural schematic diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the top view structure of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the connection between the plug and the valve stem in the utility model;

[0021] Figure 5 for Figure 4 A schematic diagram of the front view structure of

[0022] Figure 6 for Figure 4 Schematic diagram of the left view structure;

[0023] Figure 7 for Figure 3 Schematic diagram of the cross-sectional structure of the isometric view of the AA surface;

[0024] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point B in the middle.

[0025] Description of Figure Numbers:

[0026] 1. Plug;

[0027] 2. Valve stem; 21. Thrust washer;

[0028] 3. Runner slotting;

[0029] 4. Fluorine-lined structural layer;

[0030] 5. Valve body; 51. Valve seat; 52. Gland; 53. Sealing gasket;

[0031] 6. Valve cover; 61. Sealing packing gland;

[0032] 7. Actuator; 71. Bracket; 72. Transmission gear; 73. Drive gear; 74. Actuator;

[0033] 8. Connecting part; 81. Connecting mechanism. DETAILED DESCRIPTION

[0034] 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 reference numerals throughout represent the same or similar elements or elements having 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.

[0035] Example 1

[0036] See also Figure 1-8The utility model provides the following technical solutions: a high-precision, long-life, fluorine-lined regulating plug valve, including a valve body 5, a plug 1, a valve stem 2, a valve cover 6 and an actuator 7; a cavity is provided in the middle of the valve body 5, the plug 1 is placed in the cavity inside the valve body 5, the front and back of the cavity are flow channels for medium circulation, the middle of the plug 1 is a solid structure without a flow channel opening, a flow channel groove 3 of a gradually opening structure is provided on one side of the plug 1, and a fluorine-lined structural layer 4 is provided on the surface of the plug 1; the top of the plug 1 is connected to the valve stem 2, a valve cover 6 is installed on the top of the valve body 5, the valve stem 2 passes through the valve cover 6 and extends to the top of the valve body 5. The actuator installed above the valve cover 6 The actuator 7 controls the opening and closing of the plug 1 by twisting the valve stem 2. In this embodiment, the valve stem 2 is driven by the actuator 7 to drive the plug 1 to rotate in the internal cavity of the valve body 5. When the valve is opened, a flow channel slot 3 with a gradually opening structure is provided on one side of the plug 1. The fluid in the pipeline transmission will enter the internal cavity of the valve body 5 from the connecting portion 8, and then enter the flow channel slot 3 with a gradually opening structure on the side of the plug 1. As the size of the flow channel inside the valve body 5 increases, the transmission rate of the medium will decrease, so as to alleviate the strong impact of the medium faced by the conventional plug valve during the opening and closing process, and effectively extend the life of the fluorine-lined plug valve. At the same time, by designing and optimizing the gradually opening structure of the flow channel slot 3 on the plug 1, the characteristic flow curve of the plug valve can meet the linear function form, and high-precision flow regulation can be achieved; so as to realize the opening and closing of the plug valve.

[0037] In this embodiment, the actuator 7 includes a bracket 71, a transmission gear 72 and a driving gear 73. The transmission gear 72 is fixedly mounted on the upper end of the valve stem 2. The driving gear 73 is mounted on the bracket 71 and meshed with the transmission gear 72. An actuator 74 for driving the driving gear 73 to rotate is mounted on the top of the bracket 71. The actuator 74 is a pneumatic, hydraulic and manual actuator, and the actuator can ensure precise control of the opening and closing angles. The actuator 74 on the actuator 7 drives the driving gear 73 to rotate, thereby meshing and driving the transmission gear 73 to rotate. The transmission gear 73 rotates and simultaneously rotates the valve stem 2, and the valve stem 2 is used to drive the plug 1 to rotate in the internal cavity of the valve body 5.

[0038] In this embodiment, flow channels for medium circulation are provided at both ends of the internal cavity of the valve body 5, and the medium circulation channels are circular or square; a fluorine-lined structural layer is provided on the inner surface of the valve body 5, and a fluorine-lined structural layer is provided at all positions in contact with the material to play a role in corrosion resistance; connecting parts 8 connected to the flow channels are provided at the left and right ends of the valve body 5, and the valve body 5 is connected to the external pipe fittings through the connecting part 8 via the connecting mechanism 81.

[0039] In this embodiment, the material of the fluorine-lined structural layer 4 is PTFE, FEP, PFA, ETFE, PVDF, PCTFE, and their modified and copolymerized products.

[0040] In this embodiment, the connection mechanism 81 is one of flange connection, ferrule connection, welding connection, clamp connection, threaded connection and clamp connection.

[0041] In this embodiment, a valve seat 51 is provided at the bottom of the internal cavity of the valve body 5, the bottom of the plug 1 rests on the valve seat 51, and a thrust washer 21 is sleeved on the bottom end of the valve stem 2. The bottom of the thrust washer 21 is tightly against the upper surface of the plug 1. The thrust washer 21 can reduce the friction between the valve stem 2 and the valve body 5 under high pressure, thereby reducing the valve torque and facilitating operation; a pressure cap 52 is installed at the bottom end of the inside of the valve cover 6, and a sealing gasket 53 is provided at the bottom end of the pressure cap 52, and a sealing packing pressure cap 61 is provided at the connection between the middle part of the valve cover 6 and the valve stem 2; double sealing is achieved by the sealing gasket 53 and the sealing packing pressure cap 61, and the sealing effect of the valve stem 2 can be effectively guaranteed under high pressure environment.

[0042] In addition, the valve body has a nominal size between DN50 and DN1200.

[0043] Working principle and use process of the utility model: When the utility model is in use, the staff drives the driving gear 73 to rotate through the actuator 74 on the actuator 7, so that the meshing drives the transmission gear 73 to rotate, and the transmission gear 73 rotates and rotates the valve stem 2 at the same time, and the valve stem 2 drives the plug 1 to rotate in the internal cavity of the valve body 5. When the valve is opened, a flow channel slot 3 with a gradually opening structure is provided on one side of the plug 1. The fluid in the pipeline transmission will enter the internal cavity of the valve body 5 from the connecting part 8, and then enter the flow channel slot 3 with a gradually opening structure on the side of the plug 1. As the size of the flow channel inside the valve body 5 increases, the transmission rate of the medium will decrease, so as to alleviate the strong impact of the medium faced by the conventional plug valve during the opening and closing process, and effectively extend the life of the fluorine-lined plug valve. At the same time, by designing and optimizing the gradually opening structure of the flow channel slot 3 on the plug 1, the characteristic flow curve of the plug valve can meet the linear function form, and high-precision flow regulation can be achieved; so as to realize the opening and closing of the plug valve.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-precision, long-life, fluorine-lined regulating plug valve, comprising a valve body (5), characterized in that: It also includes a plug (1), a valve stem (2), a valve cover (6) and an actuator (7); a cavity is provided in the middle of the valve body (5), the plug (1) is placed in the cavity inside the valve body (5), a flow channel for medium flow is provided in front and behind the cavity, the middle of the plug (1) is a solid structure, a flow channel groove (3) of a gradually opening structure is provided on one side of the plug (1), and a fluorine-lined structural layer (4) is provided on the surface of the plug (1); The top of the plug (1) is connected to the valve stem (2), a valve cover (6) is installed on the top of the valve body (5), the valve stem (2) passes through the valve cover (6) and extends to the top of the valve body (5) and is connected to an actuator (7) installed above the valve cover (6); the actuator (7) controls the opening and closing of the plug (1) by twisting the valve stem (2).

2. The high-precision, long-life, fluorine-lined regulating plug valve according to claim 1 is characterized by: The actuator (7) comprises a bracket (71), a transmission gear (72) and a driving gear (73); the transmission gear (72) is fixedly mounted on the upper end of the valve stem (2); the driving gear (73) is mounted on the bracket (71) and meshedly connected with the transmission gear (72); an actuator (74) for driving the driving gear (73) to rotate is mounted on the top of the bracket (71).

3. The high-precision, long-life, fluorine-lined regulating plug valve according to claim 1 is characterized in that: The inner surface of the valve body (5) is provided with a fluorine-lined structural layer, and the left and right ends of the valve body (5) are provided with connecting parts (8) connected to the flow channel. The valve body (5) is connected to an external pipe fitting via the connecting part (8) through a connecting mechanism (81).

4. The high-precision, long-life, fluorine-lined regulating plug valve according to claim 3 is characterized by: The connection mechanism (81) is one of a flange connection, a ferrule connection, a welding connection, a clamp connection, a threaded connection and a clamp connection.

5. The high-precision, long-life, fluorine-lined regulating plug valve according to claim 1 is characterized by: A valve seat (51) is provided at the bottom of the internal cavity of the valve body (5), the bottom of the plug (1) abuts against the valve seat (51), a thrust washer (21) is sleeved on the bottom end of the valve stem (2), the bottom of the thrust washer (21) is in close contact with the upper surface of the plug (1), a gland (52) is installed at the bottom end of the valve cover (6), and a sealing gasket (53) is provided at the bottom end of the gland (52), and a sealing packing gland (61) is provided at the connection between the middle part of the valve cover (6) and the valve stem (2).

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