A gate assembly for a resilient seated gate valve

Abstract

The utility model relates to a gate assembly of a telescopic flat gate valve and belongs to the technical field of valves, which comprises a main gate and a secondary gate, the main gate and the secondary gate are matched with each other through inclined surfaces, and a valve rod mounting hole is arranged at the upper end of the main gate, characterized in that: a positioning device and a limiting device are arranged between the inclined surfaces matched with each other of the main gate and the secondary gate to realize the mutual connection and limiting between the two, effectively solve the problem of volume increase and installation space caused by the connection of the gate frame in the prior art, and have the advantages of simple structure, small volume, low cost and the like.

Description

Technical Field

[0001] This utility model belongs to the field of valves, and in particular relates to the gate of a retractable flat gate valve. Background Technology

[0002] The gate of a retractable flat gate valve typically consists of a main gate and an auxiliary gate, connected by an inclined plane. The upper end of the main gate is connected to the valve stem, and the rise or fall of the valve stem moves the main gate up and down, opening or closing the gate. When the valve stem rises, the main gate rises and the auxiliary gate retracts to open; when the valve stem falls, the main gate and auxiliary gate fall together and then retract to close, achieving frictionless opening and closing of the sealing surfaces of the main and auxiliary gates. However, in existing technologies, to prevent radial displacement between the main and auxiliary gates, a gate frame is generally used to position them. This involves mounting the main and auxiliary gates on a gate frame to form a retractable gate assembly, which is then installed as a whole within the valve body. This design is complex, bulky, and costly to manufacture, significantly increasing the installation space within the valve body and resulting in a large and expensive valve body. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a gate assembly for a retractable flat gate valve that is simple in structure, small in size, and low in manufacturing cost.

[0004] The technical solution for realizing this utility model is as follows: A gate assembly for a retractable flat gate valve includes a main gate and an auxiliary gate, which are engaged by inclined surfaces. The upper end of the main gate has a valve stem mounting hole. The valve is characterized by a positioning device and a limiting device located between the engaged inclined surfaces of the main and auxiliary gates. The positioning device consists of a dovetail-shaped guide block in the middle of the inclined surface of the main gate and a dovetail-shaped guide groove in the middle of the inclined surface of the auxiliary gate. The limiting device includes an upper limiting device and a lower limiting device. The upper limiting device consists of an upper limiting stop fixedly installed on the upper side of the dovetail-shaped guide groove of the auxiliary gate and engaged with the upper surface of the dovetail-shaped guide block of the main gate. The lower limiting device consists of a lower limiting stop fixedly installed on the lower side of the dovetail-shaped guide groove of the auxiliary gate and engaged with the lower surface of the dovetail-shaped guide block of the main gate.

[0005] A preferred solution is to install a spring between the lower limit stop and the lower plane of the dovetail guide block of the main gate.

[0006] Compared with the prior art, the advantages of this utility model are that the main gate and the auxiliary gate are connected by a positioning device and a limiting device between their inclined surfaces, which greatly reduces the installation space of the gate assembly in the valve cavity and reduces the volume of the valve body. Its structure is simple, small in size and low in cost. Attached Figure Description

[0007] Figure 1 This is a structural schematic diagram of the utility model.

[0008] Figure 2 This is an exploded structural diagram of the present invention.

[0009] In the diagram: 1. Secondary gate, 2. Main gate, 3. Lower limit stop, 4. Spring, 5. Upper limit stop, 6. Screw, 7. Dovetail guide groove, 8. Dovetail guide block, 9. Valve stem mounting hole, 10. Inclined surface. Detailed Implementation

[0010] like Figure 1 , Figure 2 The gate assembly of the expansion-type flat gate valve shown includes a main gate 2 and an auxiliary gate 1. The main gate 2 and the auxiliary gate 1 are engaged by inclined surfaces 10. The upper end of the main gate 2 is provided with a valve stem mounting hole 9 for connecting with the valve stem. The inclined surfaces 10 of the main gate 2 and the auxiliary gate 1 slope downwards towards the sealing surface of the main gate 2. When the valve stem drives the main gate 2 to rise, the auxiliary gate 1 and the main gate 2 axially contract and then rise with the main gate 2. Conversely, when the valve stem pushes the main gate 2 downwards, it drives the auxiliary gate 1 to move downwards as a whole and then axially expands it, achieving frictionless contact between the sealing surfaces of the main gate 2 and the auxiliary gate 1 and the valve seat sealing surface. Opening and closing; characterized in that: a positioning device and a limiting device are provided between the inclined surfaces of the main gate plate 2 and the auxiliary gate plate 1 that cooperate with each other; the positioning device is composed of a dovetail-shaped guide block 8 in the middle of the inclined surface of the main gate plate 2 and a dovetail-shaped guide groove 7 in the middle of the inclined surface of the auxiliary gate plate 1, which cooperate with each other. The dovetail-shaped guide block 8 and the dovetail-shaped guide groove 7 are connected by a movable fit to prevent the main gate plate 2 and the auxiliary gate plate 1 from axially separating and laterally displacing. The axial separation refers to the separation of the main gate plate 2 and the auxiliary gate plate 1 along the center line direction. The lateral displacement refers to the displacement in the direction perpendicular to the plane where the center line of the valve stem mounting hole 9 and the center line of the gate plate are located, that is, perpendicular to the auxiliary gate plate 1. Figure 1 The displacement in the paper direction achieves axial and lateral positioning between the main gate 2 and the auxiliary gate 1. The limiting device includes an upper limit device and a lower limit device. The upper limit device is composed of an upper limit stop 5 fixedly installed on the upper side of the dovetail guide groove 7 of the auxiliary gate 1 and the upper surface of the dovetail guide block 8 of the main gate 2, which cooperate with each other to limit the displacement of the main gate 2 and the auxiliary gate 1 in the direction of the center line of the valve stem mounting hole 9. When the upper surface of the dovetail guide block 8 contacts the upper limit stop 5, the main gate 2 drives the auxiliary gate 1 to rise together, thereby limiting the upward movement of the main gate 2. The lower limit device is composed of a lower limit stop 3 fixedly installed on the lower side of the dovetail guide groove 7 of the auxiliary gate 1 and the lower surface of the dovetail guide block 8 of the main gate 2, which cooperate with each other. When the lower surface of the dovetail guide block 8 contacts the lower limit stop 3, it prevents the auxiliary gate 1 from continuing to move upward and prevents the auxiliary gate 1 from moving upward and separating from the main gate 2.

[0011] This technical solution utilizes the positioning and limiting devices set between the main gate 2 and the auxiliary gate 1 to achieve the connection between the two, thus solving the problem of the existing technology using gate frame connection, which increases the volume of gate assembly and installation space, and increases the overall volume and manufacturing cost of the gate valve.

[0012] A spring 4 is installed between the lower limit stop block 3 and the lower plane of the dovetail guide block 8 of the main gate plate 2 to form a flexible connection between the main gate plate 2 and the auxiliary gate plate 1 in the vertical direction, and to increase the elastic force between the main gate plate 2 and the auxiliary gate plate 1 along the center line of the valve stem mounting hole 9, thereby improving the contraction performance between the auxiliary gate plate 1 and the main gate plate 2 when the main gate plate 2 rises.

[0013] The upper limit stop 5 and the lower limit stop 3 are respectively fixedly installed on the auxiliary gate plate 1 by screws 6. The spring 4 is composed of multiple cylindrical springs, which are installed in the spring holes on the upper surface of the lower limit stop 3 and the lower surface of the dovetail guide block 8.

[0014] The installation sequence of this utility model is as follows: after the upper limit stop block 5 is fixedly installed on the auxiliary gate plate 1 by screws 6, the dovetail guide block 8 of the main gate plate 2 is embedded into the dovetail guide groove 7 from bottom to top, and then the lower limit stop block 3 is fixedly installed on the platform below the dovetail guide groove 7 of the auxiliary gate plate 1 by screws 6, and the main gate plate 2 and the auxiliary gate plate 1 are combined to form an integral gate plate assembly.

[0015] In this utility model, directional terms such as "upper," "lower," and "horizontal" refer to the directions shown in the accompanying drawings. They are used for ease of description and should not be construed as limiting the scope of this utility model.

Claims

1. A gate assembly for a retractable flat gate valve, comprising a main gate (2) and a secondary gate (1), wherein the main gate (2) and the secondary gate (1) are engaged by an inclined plane (10), and the upper end of the main gate (2) is provided with a valve stem mounting hole (9); characterized in that: A positioning device and a limiting device are provided between the inclined surfaces of the main gate (2) and the auxiliary gate (1). The positioning device is composed of a dovetail guide block (8) in the middle of the inclined surface of the main gate (2) and a dovetail guide groove (7) in the middle of the inclined surface (10) of the auxiliary gate (1). The limiting device includes an upper limiting device and a lower limiting device. The upper limiting device is composed of an upper limiting block (5) fixedly installed on the upper side of the dovetail guide groove (7) of the auxiliary gate (1) and the upper plane of the dovetail guide block (8) of the main gate (2). The lower limiting device is composed of a lower limiting block (3) fixedly installed on the lower side of the dovetail guide groove (7) of the auxiliary gate (1) and the lower plane of the dovetail guide block (8) of the main gate (2).

2. The gate assembly of the retractable flat gate valve according to claim 1, characterized in that: in A spring (4) is installed between the lower limit stop (3) and the lower plane of the dovetail guide block (8) of the main gate (2).

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