Rising stem gate valve

Abstract

A rising stem gate valve is characterized in that a lifting block is arranged at the upper end of a valve rod, a support is arranged on a valve cover, a lifting rod is rotatably installed on the support, and the lifting rod is in threaded connection with the lifting block. When the valve is opened, the lifting rod is rotated to drive the lifting block to ascend, and the lifting block drives the valve rod to ascend, so that the flashboard is driven to ascend to open the valve. Compared with a single valve rod structure in an existing conventional rising stem gate valve, the length of the valve rod can be greatly reduced, and the lifting action of the valve rod cannot influence the overall height change of the valve; therefore, the installation space requirement is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a rising stem gate valve. Background Art

[0002] At present, gate valves are widely used in pipelines in the petroleum, chemical, pharmaceutical, metallurgy, coal, electric power, urban water supply and drainage industries to control the flow and cutoff of pipeline media. They are one of the most widely used valves in various fluid transportation projects.

[0003] Rising stem gate valve is a type of gate valve. According to the different valve stem structures, gate valves can be divided into rising stem gate valves and concealed stem gate valves. The valve stem of the rising stem gate valve drives the gate to rise and fall together, and the transmission thread on the valve stem is outside the valve body. Therefore, the opening and closing and position of the gate can be intuitively judged according to the movement direction and position of the valve stem, and the transmission thread is easy to lubricate and is not corroded by the fluid.

[0004] like Figure 3 As shown in the figure, it is an existing conventional rising stem gate valve, the lower half of the valve stem extends into the valve body and is connected to the gate plate, the upper half of the valve stem is formed with a threaded structure and connected to a nut, the hand wheel is connected to the nut, and rotating the hand wheel can drive the nut to rotate, thereby driving the valve stem to rise and fall. With the above structure, when the valve is opened, the valve stem will rise and be higher than the valve height, especially when the valve is fully opened, the extended height is very high, and the valve stem will be significantly higher than the original height of the valve. Therefore, rising stem gate valves often require a larger installation space, which makes the use of rising stem gate valves easily limited by the installation space. Utility Model Content

[0005] In order to overcome the shortcomings of the background technology, the utility model provides a rising stem gate valve.

[0006] The technical solution adopted by the utility model is: a rising-stem gate valve, comprising a valve body, a valve cover, a gate plate, and a valve stem, wherein the valve cover is mounted on the upper end of the valve body, the gate plate is arranged in the valve body, and the valve stem passes through the valve cover and is connected to the gate plate; a lifting block is provided at the upper end of the valve stem, a bracket is provided on the valve cover, a lifting rod is rotatably mounted on the bracket, and the lifting rod is threadedly connected to the lifting block.

[0007] A positioning seat is provided at the upper end of the bracket, a positioning groove is formed on the positioning seat, an annular boss is formed on the outer ring of the lifting rod, the lifting rod passes through the positioning seat from top to bottom, and the annular boss is embedded in the positioning groove, and a clamping block that cooperates with the annular boss to limit the position is also installed at the positioning groove.

[0008] An operating hand wheel is installed on the upper end of the lifting rod.

[0009] The lifting block is threadedly connected to the upper end of the valve stem

[0010] A packing seal assembly is provided between the valve stem and the valve cover.

[0011] The beneficial effect of the utility model is that when the above scheme is adopted, when the valve is opened, the lifting rod is rotated, the lifting rod will drive the lifting block to rise, and the lifting block will drive the valve stem to rise, thereby driving the gate plate to rise and open the valve. Compared with the single valve stem structure in the existing conventional rising stem gate valve, the valve stem length can be greatly reduced, and the lifting and lowering action of the valve stem will not affect the overall height change of the valve, thereby greatly reducing the installation space requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the rising stem gate valve when it is closed according to an embodiment of the utility model.

[0013] Figure 2 It is a structural schematic diagram of the rising stem gate valve of the utility model embodiment when it is fully opened.

[0014] Figure 3 It is a structural schematic diagram of an existing conventional rising stem gate valve when it is fully opened. DETAILED DESCRIPTION

[0015] The embodiments of the utility model are further described below in conjunction with the accompanying drawings.

[0016] like Figure 1-2 As shown, a rising stem gate valve includes a valve body 1, a valve cover 2, a gate plate 3, a valve stem 4, a lifting block 5, a bracket 6, a lifting rod 7, and an operating hand wheel 10.

[0017] The valve cover 2 is fixedly mounted on the upper end of the valve body 1 . A medium flow channel is formed on the valve body 1 . A middle cavity is formed between the valve cover 2 and the valve body 1 . A valve seat sealing surface is formed at a position of the valve body 1 corresponding to the middle cavity.

[0018] The gate plate 3 is arranged in the middle cavity of the valve body 1, and the lower end of the valve stem 4 passes through the valve cover 2 and is connected to the gate plate 3. A packing sealing assembly 11 is arranged between the valve stem 4 and the valve cover 2 to ensure reliable sealing. The gate plate 3 can be driven to rise and fall by the lifting action of the valve stem 4, thereby realizing the opening and closing action of the valve. When the valve is closed, the gate plate 3 can fit tightly with the sealing surface of the valve seat to achieve sealing.

[0019] A lifting block 5 is provided at the upper end of the valve stem 4, and the bracket 6 is installed at the upper end of the valve cover 2. A positioning seat 8 is provided at the upper end of the bracket 6, and a positioning groove 81 is formed on the positioning seat 8. An annular boss 71 is formed on the outer ring of the lifting rod 7. The lifting rod 7 passes through the positioning seat 8 from top to bottom, and the annular boss 71 is embedded in the positioning groove 81. A clamping block 9 that cooperates with the annular boss 71 is also installed at the positioning groove 81. Under the restriction of the clamping block 9, the lifting rod 7 cannot be raised or lowered and can only be rotated.

[0020] The upper end of the lifting rod 7 is fixedly connected to the operating hand wheel 10, and the lower half of the lifting rod 7 is formed with an external thread and is threadedly connected to the lifting block 5. Rotating the operating hand wheel 10 can drive the lifting rod 7 to rotate synchronously. Since the lifting block 5 cannot rotate due to the restriction of the valve stem, the rotation of the lifting rod 7 can drive the lifting block 5 to move up and down. The lifting and lowering movement of the lifting block 5 can drive the valve stem 4 to move up and down synchronously, thereby realizing the opening and closing action of the valve.

[0021] By adopting the above scheme, the lifting rod and lifting block are used to drive the valve stem to rise and fall. Compared with the single valve stem structure in the existing conventional rising stem gate valve, the valve stem length can be greatly reduced, and the lifting action of the valve stem will not affect the overall height change of the valve, thereby greatly reducing the installation space requirements.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 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 present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0024] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A rising stem gate valve, comprising a valve body (1), a valve cover (2), a gate plate (3), and a valve stem (4), wherein the valve cover (2) is mounted on the upper end of the valve body (1), the gate plate (3) is arranged in the valve body (1), and the valve stem (4) passes through the valve cover (2) and is connected to the gate plate (3); Features: A lifting block (5) is provided at the upper end of the valve stem (4), a bracket (6) is provided on the valve cover (2), a lifting rod (7) is rotatably mounted on the bracket (6), and the lifting rod (7) is threadedly connected to the lifting block (5).

2. The rising stem gate valve according to claim 1, characterized in that: A positioning seat (8) is provided at the upper end of the bracket (6), a positioning groove (81) is formed on the positioning seat (8), an annular boss (71) is formed on the outer ring of the lifting rod (7), the lifting rod (7) passes through the positioning seat (8) from top to bottom, and the annular boss (71) is embedded in the positioning groove (81), and a clamping block (9) that cooperates with the annular boss (71) to limit the position is also installed at the positioning groove (81).

3. The rising stem gate valve according to claim 1, characterized in that: An operating hand wheel (10) is mounted on the upper end of the lifting rod (7).

4. The rising stem gate valve according to claim 1, characterized in that: The lifting block (5) is threadedly connected to the upper end of the valve stem (4).

5. The rising stem gate valve according to claim 1, characterized in that: A packing seal assembly (11) is provided between the valve stem (4) and the valve cover (2).

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