Oil-sealed plug valve

Abstract

The invention discloses an oil-sealed plug valve, comprising a valve body, a plug, a valve stem, a bottom cover, an adjusting screw, an oil filling valve, a packing pad, a packing, a packing hole, a triangular pad, a diaphragm pad, a pressure cap, an adjusting bolt, a valve cover, a bolt, a top block, graphite and a gasket. The invention has a reasonable structure, and the tightness of the valve cover seal and the packing seal is adjusted by adjusting the downward force of the bolt. The double sealing structure ensures that the sealing grease does not leak from the valve cover, thereby ensuring the sealing performance of the valve. Graphite is arranged through the gasket, a diaphragm pad is arranged above the graphite, and a top block is arranged on the diaphragm pad. An adjusting hole is arranged on the bottom cover, and the tightness of the lower seal can be adjusted by adjusting the screw, thereby adopting a double adjustment structure design, adjusting the tightness of the valve cavity according to the needs, reducing the torque, balancing the pressure inside the cavity, and being able to oil seal the gap at the connection, while achieving the effect of lubrication, facilitating the rotation of the valve stem, and avoiding rust.

Description

Technical Field

[0001] The present application relates to a plug valve, in particular to an oil-sealed plug valve. Background Art

[0002] A valve is a pressure pipeline component. It is a device used to change the cross-section of the pipeline and the flow direction of the medium, and to control the pressure, flow, temperature, etc. of the conveying medium. It has the functions of diversion, interception, regulation, diversion, or overflow pressure relief, and is widely used in various major areas of the national economy. In recent years, China's valve industry has developed more and more rapidly, with increasing product exports and market share, becoming the main production base and main sales market for the valve industry. As one of the general valves for industrial and civil engineering, the plug valve has the characteristics of simple structure and rapid switching and is widely used in various industries such as petrochemicals.

[0003] Long-term use of the plug valve will cause leakage due to reduced sealing between the valve body and the valve stem, and will also accelerate the rust and corrosion of the corresponding parts. In addition, the tightness of the internal structure cannot be adjusted, the torque is large, and it cannot better balance the pressure inside the cavity. Therefore, an oil-sealed plug valve is proposed to address the above problems. Summary of the invention

[0004] An oil-sealed plug valve comprises a valve body, a plug is arranged inside the valve body, a valve stem is arranged on the plug, a driving actuator is installed at the bottom end of the valve stem, a plurality of oil sealing grooves are equidistantly arranged above and below the annular surface part of the plug located inside the valve body, the plurality of oil sealing grooves are interconnected, and one of the oil sealing grooves is connected to the surface of the valve body through an oil filling hole, and an oil filling valve is installed on the outer port of the oil filling hole.

[0005] Furthermore, the valve cover is located on the valve body, a pressure cover is provided inside the valve cover, a diaphragm pad is provided below the pressure cover, a triangular pad is provided below the diaphragm pad, and the pressure cover, diaphragm pad and triangular pad form a sealing structure on the valve cover.

[0006] Furthermore, the adjusting bolt passes through the valve cover and contacts the pressure cover.

[0007] Furthermore, the packing is located in an annular space structure formed by the packing pad, the valve body and the plug, and the formed annular space structure is connected with the outside of the valve body through the packing hole.

[0008] Furthermore, the bottom cover is located at the bottom of the valve body, and the middle inner side of the bottom cover is connected to the corresponding end of the plug, and the bottom cover is provided with an inclined adjustment hole structure.

[0009] Furthermore, the bottom cover and the valve cover are connected to each other at corresponding upper and lower positions of the valve body by bolts.

[0010] Furthermore, a lower sealing structure is provided inside the bottom cover, and the lower sealing structure includes a gasket, graphite is provided on the gasket, a diaphragm pad is provided above the graphite, and the diaphragm pad is provided with a top block.

[0011] Furthermore, the annular notch of the oil sealing groove is in sliding sealing contact with the inner ring wall of the annular column hole structure inside the valve body, and the oil sealing grooves are connected to each other through fine channels.

[0012] Furthermore, a spring-pressing sheet is installed on the end surface of one end of the adjusting bolt, and the spring-pressing sheet and the edge of the top cover surface of the pressure cover are pressed against each other.

[0013] Furthermore, the packing enters the annular space structure formed by the packing pad, the valve body and the plug through the packing hole.

[0014] The beneficial effect of the present application is that the present application provides an oil-sealed plug valve with a double sealing structure and a double adjustment structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A front view of the overall structure of an embodiment of the present application;

[0017] Figure 2 A rear view of the overall structure of an embodiment of the present application;

[0018] Figure 3 This is a partial enlarged view of point A of an embodiment of the present application;

[0019] Figure 4 This is a partial enlarged view of point B of an embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the overall structure of location A of an embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of the connection structure between the plug and the valve stem according to an embodiment of the present application.

[0022] In the figure: 1, valve body, 2, plug, 201, oil sealing groove, 202, oil filling hole, 3, valve stem, 4, bottom cover, 5, drive actuator, 6, oil filling valve, 7, packing pad, 8, packing, 9, packing hole, 10, triangular pad, 11, diaphragm pad, 12, pressure cover, 13, adjusting bolt, 14, valve cover, 15, bolt, 16, top block, 17, graphite, 18, gasket. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] See also Figure 1-6 As shown, an oil-sealed plug valve comprises a valve body 1, a plug 2 is arranged inside the valve body 1, a valve stem 3 is arranged on the plug 2, a driving actuator is installed at the bottom end of the valve stem 3, a plurality of oil sealing grooves 201 are equidistantly arranged above and below the annular surface portion of the plug 2 located inside the valve body 1, the plurality of oil sealing grooves 201 are interconnected, and one of the oil sealing grooves 201 is connected to the surface of the valve body 1 through an oil filling hole 202, and an oil filling valve 6 is installed on the outer port of the oil filling hole 202.

[0030] The valve cover 14 is located on the valve body 1, a gland 12 is provided inside the valve cover 14, a diaphragm pad 11 is provided below the gland 12, a triangular pad 10 is provided below the diaphragm pad 11, and the gland 12, the diaphragm pad 11 and the triangular pad 10 form a sealing structure on the valve cover 14;

[0031] The adjusting bolt 13 passes through the valve cover 14 and contacts the gland 12; the packing 8 is located in the annular space structure formed by the packing pad 7, the valve body 1 and the plug 2, and the formed annular space structure is connected to the outside of the valve body 1 through the packing hole 9; the bottom cover 4 is located at the bottom of the valve body 1, and the middle part of the inner side of the bottom cover 4 is connected to the corresponding end of the plug 2, and the bottom cover 4 is provided with an inclined adjusting hole structure; the bottom cover 4 and the valve cover 14 are connected to each other at the corresponding upper and lower positions of the valve body 1 through bolts 15; a lower sealing structure is provided inside the bottom cover 4, and the lower sealing structure includes A gasket 18 is provided with graphite 17, a diaphragm pad 11 is provided above the graphite 17, and the diaphragm pad 11 is provided with a top block 16; the annular notch of the oil sealing groove 201 is in sliding sealing contact with the inner ring wall of the annular column hole structure inside the valve body 1, and the oil sealing grooves 201 are interconnected through fine channels; a spring-pressing sheet is installed on the end face of one end of the adjusting bolt 13, and the spring-pressing sheet and the edge of the top cover surface of the pressure cover 12 are pressed together; the packing 8 enters the annular space structure formed by the packing pad 7, the valve body 1 and the plug 2 through the packing hole 9.

[0032] When the present application is in use, an adjusting bolt 13 is provided above the valve cover 14, and the adjusting bolt 13 passes through the valve cover 14 and connects with the pressure cover 12. When working, the tightness of the valve cover 14 seal and the packing 8 seal is adjusted by adjusting the downward force of the bolt 13 as needed. The double sealing structure ensures that the sealing grease does not leak from the valve cover, thereby ensuring the sealing performance of the valve; a lower seal is provided inside the bottom cover 1, and a graphite 17 is provided through a gasket 18. A diaphragm pad 11 is provided above the graphite 17, and a top block 16 is provided on the diaphragm pad. An adjusting hole is provided on the bottom cover 4, and the tightness of the lower seal can be adjusted by adjusting the screw. By opening a plurality of interconnected oil sealing grooves 201 on the annular surface of the plug 2 and injecting grease into the annular space formed by the oil sealing groove 201 and the annular wall of the column hole structure in the valve body 1 through the oil filling valve 6 installed on the oil filling hole 202, the gap at the connection can be oil-sealed, and at the same time, the lubrication effect is achieved, which is convenient for rotating the valve stem 3 and avoiding rust.

[0033] The benefits of this application are:

[0034] 1. The structure of the present application is reasonable. By adjusting the downward force of the bolt 13, the tightness of the valve cover 14 seal and the packing 8 seal is adjusted. The double sealing structure ensures that the sealing grease does not leak from the valve cover, thereby ensuring the sealing performance of the valve;

[0035] 2. The present application has a reasonable structure. A graphite 17 is provided through a gasket 18. A diaphragm pad 11 is provided above the graphite 17. The diaphragm pad is provided with a top block 16. An adjustment hole is provided on the bottom cover 4. The tightness of the lower seal can be adjusted by adjusting the screw. Thus, a double adjustment structure design is adopted to adjust the tightness of the valve cavity as needed, reduce the torque, and balance the pressure inside the cavity.

[0036] 3. The present application has a reasonable structure. By opening a plurality of oil sealing grooves 201 interconnected with each other on the annular surface of the plug 2 and injecting grease into the annular space formed by the oil sealing groove 201 and the annular wall of the column hole structure in the valve body 1 through the oil filling valve 6 installed on the oil filling hole 202, the gap at the connection can be oil-sealed and the lubrication effect can be achieved at the same time, which facilitates the rotation of the valve stem 3 and avoids rust.

[0037] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An oil-sealed plug valve, characterized in that: The valve body (1) comprises a valve plug (2) disposed inside the valve body (1), a valve stem (3) disposed on the valve plug (2), a driving actuator (5) mounted on the bottom end of the valve stem (3), a plurality of oil sealing grooves (201) equidistantly disposed above and below the annular surface of the valve plug (2) located inside the valve body (1), the plurality of oil sealing grooves (201) being interconnected, and one of the oil sealing grooves (201) being connected to the surface of the valve body (1) via an oil injection hole (202), and an oil injection valve (6) being mounted on the outer port of the oil injection hole (202); A valve cover (14), wherein the valve cover (14) is located on the valve body (1), a gland (12) is provided inside the valve cover (14), a diaphragm pad (11) is provided below the gland (12), a triangular pad (10) is provided below the diaphragm pad (11), and the gland (12), the diaphragm pad (11) and the triangular pad (10) form a sealing structure on the valve cover (14); An adjusting bolt (13), wherein the adjusting bolt (13) passes through the valve cover (14) and contacts the gland (12); A packing (8), wherein the packing (8) is located in an annular space structure formed by the packing pad (7), the valve body (1) and the plug (2), and the formed annular space structure is connected to the outside of the valve body (1) through a packing hole (9); A bottom cover (4), the bottom cover (4) is located at the bottom of the valve body (1), and the middle part of the inner side of the bottom cover (4) is connected to the corresponding end of the plug (2), and the bottom cover (4) is provided with an inclined adjustment hole structure; The annular notch of the oil sealing groove (201) and the inner ring wall of the annular column hole structure inside the valve body (1) are in sliding sealing contact with each other, and the oil sealing grooves (201) are connected to each other through fine channels; A lower sealing structure is provided inside the bottom cover (4), the lower sealing structure comprising a gasket (18), graphite (17) being provided on the gasket (18), a diaphragm pad (11) being provided above the graphite (17), and a top block (16) being provided on the diaphragm pad.

2. The oil-sealed plug valve according to claim 1, characterized in that: The bottom cover (4) and the valve cover (14) are connected to each other at corresponding upper and lower positions of the valve body (1) via bolts (15).

3. The oil-sealed plug valve according to claim 1, characterized in that: A spring-pressing sheet is installed on the end surface of one end of the adjusting bolt (13), and the spring-pressing sheet and the edge of the top cover surface of the pressure cover (12) are pressed against each other.

4. The oil-sealed plug valve according to claim 1, characterized in that: The packing (8) enters the annular space structure formed by the packing pad (7), the valve body (1) and the plug (2) through the packing hole (9).

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