Switch type flat gate valve

Abstract

Provided is a switch type flat gate valve. The gate valve mainly solves the problem that a sealing surface is easily scratched when a conventional gate valve is used. The gate plate assembly (4) comprises a middle plate (41) and gate plates (5) arranged on the two sides of the middle plate, and the middle plate is driven by the valve rod to ascend and descend; the middle plate is used for driving the two gate plates to move in the horizontal direction through the slope structure to be in sealing fit with the first valve seat and the second valve seat correspondingly during descending. The utility model provides a switch type flat gate valve which effectively avoids mutual friction between a gate plate and a sealing surface of a valve seat and protects the sealing surface from being scratched.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to an on-off type flat gate valve. Background Art

[0002] Traditional parallel gate valves typically feature two parallel seats with parallel sealing surfaces. The gate discs are single or double flat plates. The seat rings are welded or spring-loaded to the valve body. The seat sealing surfaces are welded, while the gate disc sealing surfaces can be welded, thermally sprayed, or clad using other methods. Parallel gate valves offer advantages such as simple manufacturing and easy maintenance. However, they cannot force the valve shut and rely solely on medium pressure to achieve a seal. This can lead to leakage during initial pressure buildup in the pipeline system or during low-pressure conditions. Some parallel gate valves incorporate one or more coil springs between the left and right discs to achieve an initial seal. However, the spring force constantly presses the discs against the body seat sealing surface. Even when the discs are nearly fully open and tilted, the spring force persists, creating uneven stress on the sealing surfaces and causing them to easily scratch. This has been a major issue with conventional parallel double-disc gate valves, a problem that has plagued valve users for many years. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model provides an on-off flat gate valve, which mainly solves the problem that the conventional gate valve is easy to scratch the sealing surface during use.

[0004] The technical solution of the utility model is:

[0005] A switch-type flat gate valve comprises a valve body and a valve stem, wherein the valve body is provided with a first valve seat and a second valve seat, and further comprises a gate assembly, comprising an intermediate plate and gate plates provided on both sides of the intermediate plate, wherein the intermediate plate is driven to rise and fall by the valve stem; the intermediate plate is used to drive the two gate plates to move in a horizontal direction through an inclined surface structure when descending, and respectively cooperate with the first valve seat and the second valve seat in a sealing manner.

[0006] A first inclined surface is provided on a side of the intermediate plate opposite to the gate plate, and a second inclined surface matching the first inclined surface is provided on the gate plate.

[0007] The middle plate is provided with a platform, and the gate plate is provided with a convex block arranged opposite to the platform. When the middle plate rises, the platform contacts the convex block and thereby drives the gate plate to rise.

[0008] It also includes a base, which is arranged at the bottom of the inner wall of the valve body and is opposite to the gate plate.

[0009] The gate plate includes an outer plate and a wedge block that are detachably connected, and the second inclined surface is provided on the wedge block.

[0010] The outer plate is provided with a sinking groove, and part of the wedge blocks are installed in the sinking groove and fixed by fasteners.

[0011] The outer plate is provided with an arc-shaped boss, which covers a portion of the sink groove, and the wedge block is provided with a second boss that is matched with the boss.

[0012] The beneficial effects of the utility model are as follows: the utility model provides an on-off flat gate valve, which effectively avoids mutual friction between the gate plate and the sealing surface of the valve seat, and protects the sealing surface from being scratched. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0014] Figure 2 This is a partial cross-sectional schematic diagram of an embodiment of the present invention (when the valve is open).

[0015] Figure 3 This is a partial cross-sectional schematic diagram of an embodiment of the present invention (when the valve is closed).

[0016] Figure 4 This is a schematic diagram of an outer panel according to an embodiment of the present invention.

[0017] Figure 5 This is a schematic diagram of a wedge block according to an embodiment of the present invention.

[0018] Figure 6 This is a schematic diagram of an intermediate plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings: As shown in the figure, a switch-type flat gate valve includes a valve body 1 and a valve stem 2, wherein the valve body is provided with a first valve seat 31 and a second valve seat 32, and further includes a gate assembly 4, including an intermediate plate 41 and gate plates 5 provided on both sides of the intermediate plate, wherein the intermediate plate is driven to rise and fall by the valve stem; the intermediate plate is used to drive the two gate plates to move in the horizontal direction through the inclined surface structure when descending, and respectively cooperate with the first valve seat and the second valve seat in a sealed manner.

[0020] When the valve stem drives the middle plate downward, the two gates are stretched outward within a limited range of movement, gradually approaching the valve seat, so that the sealing surfaces of the gates and the valve seat are pressed and sealed. When the valve stem drives the middle plate upward, a gap is created between the middle plate and the gate (in the horizontal direction). Under the action of the medium pressure in the channels at both ends of the valve body, the gate gradually moves inward, separating the sealing surfaces of the gate and the valve seat. This effectively prevents friction between the sealing surfaces of the gate and the valve seat, protecting the sealing surfaces from being scratched. The middle plate continues to rise, driving the gate as a whole to rise.

[0021] In this embodiment, as shown in the figure, the middle plate has a first inclined surface 411 on the side opposite to the gate plate, and the gate plate has a second inclined surface 51 that matches the first inclined surface. When the middle plate moves, the first inclined surface pushes the second inclined surface to move the gate plate closer to the valve seat.

[0022] In this embodiment, as shown in the figure, the intermediate plate is provided with a platform 412, and the gate plate is provided with a protrusion 52 positioned opposite the platform. When the intermediate plate rises, the platform contacts the protrusion, thereby driving the gate plate upward. When the gate is closed, there is a gap between the protrusion and the platform, and when the gate is opened, the two gradually move closer.

[0023] In this embodiment, as shown in the figure, a base 11 is further included, which is arranged at the bottom of the inner wall of the valve body and is opposite to the gate plate.

[0024] In this embodiment, as shown in the figure, the gate plate includes an outer plate 6 and a wedge block 7 that are detachably connected, and the second inclined surface is provided on the wedge block.

[0025] In this embodiment, as shown in the figure, a recessed groove 61 is provided on the outer plate, and part of the wedge block is installed in the recessed groove and fixed by a fastener 62.

[0026] In this embodiment, as shown in the figure, the outer plate is provided with an arcuate boss 63, which partially covers the recessed groove. The wedge block is provided with a second boss 73 that matches the boss. Two symmetrically distributed sector-shaped retaining plates (i.e., first bosses) are provided on the back of the outer plate, and two symmetrically distributed sector-shaped retaining plates (i.e., second bosses) are also provided on the back of the wedge block. When the wedge block is installed in the recessed groove of the gate plate, the wedge block is rotated 90° so that the sector-shaped retaining plates of the wedge block and the sector-shaped retaining plates of the gate plate overlap in a one-to-one correspondence. The wedge block is then tightened with a hexagon socket screw to secure the wedge block within the sector-shaped retaining plates of the gate plate.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0029] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be construed as limiting the present invention, but any improvements based on the spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. An on-off flat gate valve, comprising a valve body (1) and a valve stem (2), wherein a first valve seat (31) and a second valve seat (32) are provided in the valve body, characterized in that: Also includes The gate assembly (4) comprises an intermediate plate (41) and gate plates (5) provided on both sides of the intermediate plate, wherein the intermediate plate is driven to rise and fall by the valve stem; the intermediate plate is used to drive the two gate plates to move in a horizontal direction through an inclined surface structure when descending, and respectively cooperate with the first valve seat and the second valve seat in a sealing manner.

2. The on-off flat gate valve according to claim 1, characterized in that: A first inclined surface (411) is provided on a side of the intermediate plate opposite to the gate plate, and a second inclined surface (51) matching the first inclined surface is provided on the gate plate.

3. The on-off flat gate valve according to claim 1, characterized in that: The middle plate is provided with a platform (412), and the gate plate is provided with a protrusion (52) arranged opposite to the platform. When the middle plate rises, the platform contacts the protrusion and thereby drives the gate plate to rise.

4. The on-off flat gate valve according to any one of claims 1 to 3, characterized in that: It also includes a base (11), which is arranged at the bottom of the inner wall of the valve body and is arranged opposite to the gate plate.

5. The on-off flat gate valve according to claim 2, characterized in that: The gate plate comprises a detachably connected outer plate (6) and a wedge block (7), and the second inclined surface is provided on the wedge block.

6. The on-off flat gate valve according to claim 5, characterized in that: A sink groove (61) is provided on the outer plate, and part of the wedge blocks are installed in the sink groove and fixed by fasteners (62).

7. The on-off flat gate valve according to claim 6, characterized in that: An arc-shaped boss (63) is provided on the outer plate, the boss covering part of the sink groove, and a second boss (73) adapted to the boss is provided on the wedge block.

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