A gate valve with a built-in check function

Abstract

The present invention discloses a gate valve with a self-contained check function, comprising a valve body, a gate, a small check spring, a small check valve core, a pin spring, a gate pin 1, a gate pin 2, and a valve stem. The valve body is connected to the valve stem, the lower section of the valve stem is provided with a pin spring and a gate pin 2, the gate pin 2 is provided with a locking control channel, the valve stem is connected to the gate, the downstream side of the gate is provided with a disengagement control channel, the upstream side of the gate is provided with a pin spring and a gate pin 1, the gate pin 1 is provided with a small check spring and a small check valve core, and the gate pin 1, the gate pin 2 and the disengagement control channel are aligned. The device of the present invention realizes the check function of the valve by providing a slidable gate, a small check spring, a small check valve core, a pin spring, a gate pin 1, and a gate pin 2, in conjunction with the locking control channel and the disengagement control channel. The device has a compact structure and no additional resistance when conducting, thereby reducing the pressure loss of the medium when passing through the gate valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a gate valve with a self-check function. Background Art

[0002] A gate valve is a disc that opens and closes the flow, moving perpendicularly to the direction of the fluid. It can only fully open and close, and cannot be used for flow regulation or throttling. Because it lacks a check valve, when it's open, the fluid in the outlet chamber can backflow, potentially entering the upstream pipeline and causing contamination. Therefore, both a gate valve and a check valve are often used to control the flow direction of the fluid in the pipeline. However, this installation method is cumbersome, requiring numerous assembly steps, and occupies a large space. Researchers have sought to combine the two and have developed various gate valves with a check function. For example, patent CN212775762U, "A Gate Valve with a Check Function," discloses a check gate valve that combines a check valve and a gate valve into a single valve. However, this gate valve structure is equivalent to integrating a gate valve and a check valve in series within a single valve body. This results in a large and complex valve body, high manufacturing costs, and a large overall space requirement. The patent "A Gate Valve with a Check Function" with authorization announcement number CN 216789280 U also discloses a check gate valve with a more compact valve body structure design. The check valve and gate valve are directly connected in series to form a single valve, eliminating the need to install both the gate valve and the check valve at the same time, reducing costs and occupying less space. However, both of the above devices have the following disadvantages: their check structure is equivalent to connecting a check valve in series downstream of the gate valve to achieve a check valve for the entire valve. When the check structure of the valve is in effect, the reverse medium pressure causes the valve core to block the valve seat; and when the valve is open, the inflowing medium needs to push the valve core to compress the spring to a certain extent to achieve maximum flux, and the medium needs to constantly apply pressure to the valve core to maintain the compression state of the spring. Therefore, when the valve is open, the medium needs to overcome the elastic force of the spring to do work, which increases resistance and causes pressure loss in the medium. Summary of the Invention

[0003] In response to the problems raised in the above background technology, the present invention provides a gate valve with a self-contained check function, which has a compact structure and reduces pressure loss when a medium passes through it.

[0004] The present invention is achieved through the following technical solutions:

[0005] When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior of the valve stem and sealing load chamber, and closure material is sealed to stop up and down of valve body, and closure material is sealed to stop up and down of valve body.

[0006] Furthermore, the disengagement control channel is provided with a stepped hole at one end close to the valve stem, which is matched with the gate plate pin 2.

[0007] Furthermore, the gate plate pin is restricted within the upstream portion of the gate using a mounting cover, and a through hole is provided in the middle of the mounting cover for cooperating with the gate plate pin.

[0008] Furthermore, the gate plate pin 2 is restricted in the valve stem by using a mounting cover plate 2, and a through hole cooperating with the gate plate pin 2 is provided in the middle of the mounting cover plate 2.

[0009] Furthermore, a small sealing ring is provided on the gate plate pin.

[0010] Furthermore, a small sealing ring is provided on the gate plate pin 2.

[0011] Furthermore, a large sealing ring is provided on the connection between the valve stem and the gate plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The device of the present invention realizes the check function of the valve by arranging a slidable gate, a small check spring, a small check valve core, a pin spring, a gate pin one and a gate pin two, and cooperating with a locking control channel and a disengagement control channel. In addition, the device has a compact structure design, has no additional resistance when it is turned on, and reduces the pressure loss of the medium when it passes through the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a gate valve with a self-check function provided by the present invention when it is shut off;

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0016] Figure 3 This is a schematic structural diagram of a gate valve with a self-check function provided by the present invention when it is turned on;

[0017] Figure 4 A schematic diagram of the structure of a gate valve with a self-check function provided by the present invention when it is activated and checked;

[0018] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0019] Figure 6 This is a schematic structural diagram of a gate valve with a self-check function provided by the present invention when realizing check;

[0020] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0021] Figure 8 for Figure 6 A partial enlarged view of point D in the middle.

[0022] Reference numerals:

[0023] 1. Valve body; 2. Gate; 3. Upstream inflow end; 4. Small check spring; 5. Small check valve core; 6. Pin spring; 7. Gate pin 1; 8. Gate pin 2; 9. Valve stem; 10. Locking control channel; 11. Disengagement control channel; 12. Downstream outflow end; 13. Small sealing ring; 14. Large sealing ring; 15. Install cover plate 1; 16. Install cover plate 2.

[0024] The direction of the arrow in the figure is the direction of medium flow. DETAILED DESCRIPTION

[0025] In order to make the technical features of the present invention more clearly understood, the structure of the present invention is described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 and Figure 2As shown, a gate valve with a self-contained check function includes a valve body 1, a gate 2, a small check spring 4, a small check valve core 5, a first pin spring 6-1, a second pin spring 6-2, a gate pin 1 7, a gate pin 2 8 and a valve stem 9; the valve body 1 is connected to the valve stem 9, the lower section of the valve stem 9 is provided with the first pin spring 6-1 and the gate pin 2 8, the first pin spring 6-1 is sleeved with the gate pin 2 8, the gate pin 2 8 is provided with a locking control channel 10, the valve stem 9 is connected to the gate 2, the gate 2 The downstream portion is provided with a disengagement control channel 11, which communicates with the downstream outflow end 12 of the valve body 1. The upstream portion of the gate 2 is provided with the second pin spring 6-2 and the gate pin 1 7. The second pin spring 6-2 is sleeved with the gate pin 1 7. The gate pin 1 7 is internally provided with the small check spring 4 and the small check valve core 5. The small check spring 4 is sleeved with the small check valve core 5. The locking control channel 10 extends into the gate pin 1 7. The small check valve core 5 is used to block the locking control channel 10. The gate pin 1 7 and the gate pin 2 8 are aligned with the disengagement control channel 11. The end of the gate pin 7 is processed into a flat-top cone, the height of which is not less than the length of the gate pin 7 extending into the valve stem 9, so as to facilitate the separation of the gate 2 and the valve stem 9 caused by backflow. After the normal pressure on both sides of the gate valve is restored, the gate pin 7 can be squeezed back into the gate 2 when the valve stem 9 moves downward.

[0027] Furthermore, if Figure 2 As shown, the end of the disengagement control channel 11 close to the valve stem 9 is provided with a stepped hole that cooperates with the gate plate pin 2 8.

[0028] Furthermore, if Figure 2 As shown, the gate plate pin 7 is restricted in the upstream part of the gate plate 2 by using a mounting cover plate 15, and a through hole is provided in the middle of the mounting cover plate 15 to cooperate with the gate plate pin 7.

[0029] Furthermore, if Figure 2 As shown, the gate plate pin 2 8 is restricted in the valve stem 9 by using a mounting cover plate 2 16 , and a through hole is provided in the middle of the mounting cover plate 2 16 to cooperate with the gate plate pin 2 8 .

[0030] Furthermore, if Figure 5 As shown, a small sealing ring 13 is provided on the gate pin 7.

[0031] Furthermore, if Figure 5 As shown, a small sealing ring 13 is provided on the gate pin 2 8 .

[0032] Furthermore, if Figure 5 As shown, a large sealing ring 14 is provided at the connection between the valve stem 9 and the gate plate 2.

[0033] Working principle of the present invention:

[0034] In the unstressed state or when the medium pressures at the upstream inflow end 3 and the downstream outflow end 12 are the same, the two pin springs 6 are in a compressed state. The gate pin 1 7 and the gate pin 2 8 are acted upon by the first pin spring 6-1 and the second pin spring 6-2 sleeved thereon. The gate pin 1 7 is located inside the gate 2, and the right end of the gate pin 1 7 does not extend out of the gate 2. The gate pin 2 8 is located inside the valve stem 9, and the right end of the gate pin 2 8 does not extend out of the valve stem 9. The small check spring 4 is also in a compressed state, and the small check valve core 5 is acted upon by the small check spring 4 to block the locking control channel 10. The positions of the small check valve core 5, gate pin 1 7, and gate pin 2 8 are consistent with the above. Figure 5 The unstressed state refers to the state where the gate valve is not in use.

[0035] like Figure 1-Figure 3 As shown, in normal operation, the medium pressure at the upstream inflow end 3 of the valve is higher than the medium pressure at the downstream outflow end 12. The medium pressure acts on the small check valve core 5, causing it to move to the right while compressing the small check spring 4, thereby connecting the upstream inflow end 3 with the locking control channel 10. The disengagement control channel 11 connects to the downstream outflow end 12. The medium pressure in the upstream inflow end 3 and the locking control channel 10 is higher than the medium pressure in the disengagement control channel 11, causing the gate pin 1 7 and the gate pin 2 8 to compress the second pin spring 6-2 and the first pin spring 6-1 to the right. The gate pin 1 7 extends into the valve stem 9, and the gate pin 2 extends into the disengagement control channel 11, thereby fixing the relative position of the valve stem 9 and the gate 2, causing the gate 2 to rise and fall with the valve stem 9, achieving the shutoff and conduction of the valve.

[0036] like Figure 4 、 Figure 5 As shown, when the valve is in the on state and the system medium backflow occurs, the medium pressure at the downstream outflow end 12 of the valve is higher than the medium pressure at the upstream inflow end 3. Under the combined effect of the medium pressure and the elastic force of the second pin spring 6-2 and the first pin spring 6-1, the gate pin 1 7 and the gate pin 2 8 both move to the left. The second pin spring 6-2 and the first pin spring 6-1 extend, the gate pin 1 7 leaves the valve stem 9, and the gate pin 2 8 leaves the control channel 11. Figure 6-Figure 8 As shown, relative sliding occurs between the valve stem 9 and the gate plate 2. Under the combined effect of its own weight and the high pressure of the backflow medium, the gate plate 2 quickly checks and closes the valve.

[0037] After the gate 2 is separated from the valve stem 9 and falls, the valve stem 9 moves downward to the lowest end under manual or automatic control. When the system medium pressure is normal, that is, the medium pressure at the upstream inflow end 3 is higher than the medium pressure at the downstream outflow end 12, the gate pin 1 7 extends into the valve stem 9, and the gate pin 2 8 extends into the disengagement control channel 11, and the system returns to normal state. Figure 1 shown.

[0038] In this embodiment, the gate plate 2 and the valve stem 9 are connected under the action of the gate plate pin 1 7 and the gate plate pin 2 8 only when the medium pressure at the upstream inflow end 3 of the valve is higher than the medium pressure at the downstream outflow end 12. When the medium pressure at the upstream inflow end 3 of the valve is lower than or equal to the medium pressure at the downstream outflow end 12, the gate plate pin 1 7 and the gate plate pin 2 8 will "retract" respectively. The gate plate 2 and the valve stem 9 are separated. Since the gate plate 2 and the valve stem 9 are in a separated state when the medium pressure at the upstream inflow end 3 and the downstream outflow end 12 is the same, once the system medium has a backflow phenomenon, or even a tendency to flow backward, the gate plate 2 and the valve stem 9 can be separated in time to play a check function.

[0039] The present invention has been described in detail above through the embodiments, but the contents described are only exemplary embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. The scope of protection of the present invention is defined by the claims. Any use of the technical solution described in the present invention, or any person skilled in the art who, inspired by the technical solution of the present invention, designs a similar technical solution within the essence and scope of protection of the present invention to achieve the above-mentioned technical effects, or any equivalent changes and improvements made to the scope of application, shall still fall within the scope of protection covered by the patent of the present invention.

Claims

1. A gate valve with a self-contained check function, characterized in that: The invention comprises a valve body (1), a gate (2), a small check spring (4), a small check valve core (5), a first pin spring (6-1), a second pin spring (6-2), a gate pin one (7), a gate pin two (8) and a valve stem (9); the valve body (1) is connected to the valve stem (9); the lower section of the valve stem (9) is provided with the first pin spring (6-1) and the gate pin two (8); the first pin spring (6-1) is sleeved with the gate pin two (8); the gate pin two (8) is provided with a locking control channel (10); the valve stem (9) is connected to the gate (2); the gate ( 2) is provided with a disengagement control channel (11) on the downstream side thereof, the disengagement control channel (11) being connected to the downstream outflow end (12) of the valve body (1), the upstream side of the gate plate (2) is provided with the second pin spring (6-2) and the gate plate pin one (7), the second pin spring (6-2) is sleeved on the gate plate pin one (7), the gate plate pin one (7) is provided with the small check spring (4) and the small check valve core (5), the small check spring (4) is sleeved on the small check valve core (5), the gate plate pin one (7), the gate plate pin two (8) and the disengagement control channel (11) are aligned; In normal operation, the disengagement control channel (11) is connected to the downstream outflow end (12), and the medium pressure in the upstream inflow end (3) and the locking control channel (10) is higher than the medium pressure in the disengagement control channel (11), so that the gate plate pin 1 (7) and the gate plate pin 2 (8) both compress the second pin spring (6-2) and the first pin spring (6-1) to the right, and the gate plate pin 1 (7) extends into the valve stem (9), and the gate plate pin 2 (8) extends into the disengagement control channel (11), thereby fixing the relative position of the valve stem (9) and the gate plate (2), so that the gate plate (2) rises and falls with the valve stem (9), thereby realizing the shutoff and conduction of the valve; When the valve is in the on state and the system medium flows back, the medium pressure at the downstream outflow end (12) of the valve is higher than the medium pressure at the upstream inflow end (3). Under the combined action of the medium pressure and the elastic force of the second pin spring (6-2) and the first pin spring (6-1), the gate pin 1 (7) and the gate pin 2 (8) both move to the left, the second pin spring (6-2) and the first pin spring (6-1) extend, the gate pin 1 (7) leaves the valve stem (9), and the gate pin 2 (8) leaves the control channel (11).

2. A gate valve with a self-check function according to claim 1, characterized in that: The disengagement control channel (11) is provided with a stepped hole at one end close to the valve stem (9) for cooperating with the gate plate pin 2 (8).

3. The gate valve with a self-check function according to claim 1, characterized in that: The gate plate pin 1 (7) is restricted within the upstream side portion of the gate plate (2) using a mounting cover plate 1 (15), and a through hole is provided in the middle of the mounting cover plate 1 (15) to cooperate with the gate plate pin 1 (7).

4. The gate valve with a self-check function according to claim 1, characterized in that: The gate plate pin 2 (8) is restricted in the valve stem (9) by using a mounting cover plate 2 (16), and a through hole is provided in the middle of the mounting cover plate 2 (16) to cooperate with the gate plate pin 2 (8).

5. The gate valve with a self-check function according to claim 1, characterized in that: A small sealing ring (13) is provided on the gate plate pin 1 (7).

6. The gate valve with a self-check function according to claim 1, characterized in that: A small sealing ring (13) is provided on the gate plate pin 2 (8).

7. The gate valve with a self-check function according to claim 1, characterized in that: A large sealing ring (14) is provided at the connection between the valve stem (9) and the gate plate (2).

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