A seal-stable stop valve

Abstract

The utility model provides a kind of sealing stable stop valve, belong to valve technical field.It solves the problem of poor sealing reliability of stop valve in prior art.The sealing stable stop valve, including valve body and the valve core that can be set in valve body and move up and down, the inner wall of valve body has the valve seat for communicating the both ends of valve body and with the upper and lower opposite settings of valve core, the lower end of the valve core has the accommodating groove that is concave to set upwards, the inner wall of the accommodating groove has limit protrusion, the sealing gasket is embedded in the accommodating groove with interference, and the limit protrusion can form the movement limit of sealing gasket along the axial and radial of valve core, the lower end of the sealing gasket protrudes the accommodating groove and can form sealing abutment with the valve seat to cut off the both ends of the valve body.The utility model has the advantages of improving the sealing reliability of stop valve and improving the sealing reliability of stop valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to a gate valve with stable sealing. Background Technology

[0002] A gate valve is a type of pipeline valve that enables the rapid shut-off or connection of fluids in a pipeline system. A gate valve generally includes a valve body and a valve core that is movable up and down inside the valve body. The inner wall of the valve body has a valve seat for connecting the two ends of the valve body. The valve core and the valve seat are arranged vertically opposite each other. A sealing gasket is also fitted on the lower end of the valve core. The sealing gasket can seal against the valve seat from top to bottom to isolate the two ends of the valve body.

[0003] During operation, as the shut-off valve gradually opens and closes, the reduced flow space at the valve seat causes the fluid to accelerate at this location, resulting in high-speed motion and a significantly increased shear rate. This leads to a substantial increase in friction on the sealing gasket. This friction also generates a radial force on the sealing gasket along the fluid flow direction, away from the valve core center. Simultaneously, the shut-off valve interrupts the water flow, causing water hammer due to inertia, which impacts the sealing gasket. The friction generated by the high-speed fluid flowing over the sealing gasket also impacts it. These combined impacts cause relative movement of the sealing gasket, creating a gap at the connection between the gasket and the valve core. As the fluid continues to flow, it enters this gap, pushing the sealing gasket out of the valve core along the fluid flow direction, causing the shut-off valve to lose its sealing function. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a gate valve with stable sealing. The technical problem this invention aims to solve is how to improve the sealing reliability of the gate valve.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A sealing and stable shut-off valve includes a valve body and a valve core that is movably disposed within the valve body. The inner wall of the valve body has a valve seat for communicating between the two ends of the valve body and disposed vertically opposite to the valve core. The valve core has a recessed receiving groove at its lower end, a limiting protrusion on the inner wall of the receiving groove, a sealing gasket that is interference-fitted into the receiving groove, and the limiting protrusion can limit the movement of the sealing gasket along the axial and radial directions of the valve core. The lower end of the sealing gasket protrudes from the receiving groove and can form a sealing abutment with the valve seat to isolate the two ends of the valve body.

[0007] The limiting protrusion of the receiving groove of this sealed and stable gate valve can limit the axial and radial movement of the sealing gasket. In addition, the sealing gasket is interference-fitted into the receiving groove, which can better prevent the sealing gasket from falling off, thereby improving the stability of the connection between the valve core and the sealing gasket. It also prevents the sealing gasket from deforming or shifting relative to the valve core when it is impacted by the high-speed fluid in the gate valve, ensuring the sealing effect of the sealing gasket and the valve seat, thereby improving the sealing reliability of the gate valve.

[0008] In the aforementioned type of sealed and stable shut-off valve, the limiting protrusion is integrally formed on the bottom wall of the receiving groove and has an inverted T-shaped longitudinal section. The sealing gasket covers and fixes the outer periphery of the protrusion. The inverted T-shaped protrusion and the sealing gasket located in the receiving groove are interlocked, allowing the protrusion to better limit the axial and radial movement of the sealing gasket, thus better preventing the sealing gasket from falling off.

[0009] In the aforementioned type of sealing and stable shut-off valve, the limiting protrusion is an annular protrusion integrally formed on the inner wall of the receiving groove and protruding radially along the valve core. The sealing gasket has an I-shaped longitudinal section and covers and fixes itself on the annular protrusion. The I-shaped sealing gasket and the annular protrusion are interlocked, allowing the annular protrusion to better limit the axial and radial movement of the sealing gasket, thus better preventing the sealing gasket from falling off.

[0010] In the aforementioned type of sealing and stable shut-off valve, the bottom wall of the receiving groove has an upwardly recessed groove, and the sealing gasket has an insert fixed to the inner wall of the groove. By providing the groove, the contact area at the connection between the valve core and the sealing gasket is increased, further improving the stability of the connection between the valve core and the sealing gasket.

[0011] In the aforementioned type of sealing and stable shut-off valve, the surface of the annular protrusion is conical, the upper longitudinal section of the sealing gasket is inverted trapezoidal and abuts and is fixed to the inner wall of the receiving groove, and the lower longitudinal section of the sealing gasket is rectangular and abuts and is fixed to the edge of the receiving groove. The conical surface of the annular protrusion provides a limiting structure that is larger at the top and smaller at the bottom, which can better prevent the sealing gasket from falling off.

[0012] In the aforementioned type of sealing and stable shut-off valve, the bottom wall edge of the receiving groove has a rounded corner. The rounded corner increases the contact area at the connection between the valve core and the sealing gasket, further improving the stability of the connection between the valve core and the sealing gasket.

[0013] In the aforementioned type of sealed and stable gate valve, the outer wall of the sealing gasket has an auxiliary sealing section with an L-shaped cross-section, which is fixed and covered by the outer wall of the receiving groove. The auxiliary sealing section, fixed and covered by the outer wall of the receiving groove, further forms a labyrinthine waterproof structure, which can better prevent high-speed fluid inside the sealed and stable gate valve from seeping in from the connection between the sealing gasket body and the inner wall of the receiving groove, thereby improving the stability of the connection between the valve core and the sealing gasket.

[0014] In the aforementioned type of sealing and stable shut-off valve, the valve core has an annular step located above the receiving groove, and the upper end of the auxiliary sealing section is flush with the annular step. This improves the stability of the connection between the valve core and the sealing gasket while facilitating manufacturing.

[0015] In the aforementioned type of sealed and stable gate valve, the valve core includes a columnar valve stem and a block-shaped valve disc connected to the lower end of the valve stem, with the receiving groove located on the valve disc. This allows the valve stem and valve disc of the valve core to be manufactured separately, facilitating the processing and manufacturing of the valve core.

[0016] Compared with the prior art, the advantages of this stable sealing gate valve are: this stable sealing gate valve can improve the stability of the connection between the valve core and the sealing gasket, avoid the sealing gasket from deforming or shifting relative to the valve core when impacted by the high-speed fluid in the gate valve, ensure the sealing effect of the sealing gasket and the valve seat, thereby improving the sealing reliability of the gate valve. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the sealed and stable gate valve.

[0018] Figure 2 This is a cross-sectional view of the sealed and stable shut-off valve in Embodiment 1.

[0019] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 This is an exploded view of the valve core and sealing gasket of the gate valve with stable sealing in Example 1.

[0021] Figure 5 This is a cross-sectional view of the valve disc and sealing gasket of the valve core of the sealed and stable shut-off valve in Embodiment 2.

[0022] Figure 6 This is a cross-sectional view of the valve disc and sealing gasket of the valve core of the sealed and stable shut-off valve in Embodiment 3.

[0023] Figure 7 This is a cross-sectional view of the valve disc and sealing gasket of the valve core of the sealed and stable shut-off valve in Embodiment 4.

[0024] Figure 8 This is a cross-sectional view of the valve disc and sealing gasket of the valve core of the sealed and stable shut-off valve in Embodiment 5.

[0025] In the diagram, 1 is the valve body; 1a is the valve seat; 2 is the valve core; 2a is the receiving groove; 2b is the protrusion; 2c is the annular protrusion; 2d is the groove; 2e is the rounded corner; 2f is the annular step; 3 is the sealing gasket; 3a is the auxiliary sealing section; 3b is the insert; 4 is the valve stem; and 5 is the valve disc. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] Example 1

[0028] A shut-off valve with stable sealing, as described above. Figure 1-4 The valve body includes a valve body 1 and a valve core 2 that is movably disposed within the valve body 1. The inner wall of the valve body 1 has a valve seat 1a for connecting the two ends of the valve body 1 and is vertically opposite to the valve core 2. The lower end of the valve core 2 has an upwardly recessed receiving groove 2a. The inner wall of the receiving groove 2a has a limiting protrusion. A sealing gasket 3 is interference-fitted into the receiving groove 2a, and the limiting protrusion can limit the movement of the sealing gasket 3 along the axial and radial directions of the valve core 2. The lower end of the sealing gasket 3 protrudes from the receiving groove 2a and can form a sealing abutment with the valve seat 1a to isolate the two ends of the valve body 1. Specifically, the limiting protrusion is an integrally formed protrusion 2b with an inverted T-shaped longitudinal section on the bottom wall of the receiving groove 2a, and the sealing gasket 3 covers and fixes the outer periphery of the protrusion 2b.

[0029] Reference Figure 2 , Figure 3 and Figure 4 Furthermore, the valve core 2 includes a columnar valve stem 4 and a block-shaped valve disc 5 connected to the lower end of the valve stem 4, and the receiving groove 2a is located on the valve disc 5.

[0030] In this embodiment, the outer wall of the sealing gasket 3 preferably has an auxiliary sealing section 3a with an L-shaped cross-section. The auxiliary sealing section 3a covers and is fixed to the outer wall of the receiving groove 2a. The valve core 2 has an annular step 2f located above the receiving groove 2a. The upper end of the auxiliary sealing section 3a is flush with the annular step 2f. Preferably, the valve core 2 is made of metal material, the sealing gasket 3 is made of rubber material, and the valve core 2 and the sealing gasket 3 are fixed by heat vulcanization.

[0031] Example 2

[0032] This embodiment is basically the same in structure and principle as Embodiment 1, the difference being: (Refer to...) Figure 5 The limiting protrusion is an annular protrusion 2c integrally formed on the inner wall of the accommodating groove 2a and protruding radially along the valve core 2. The longitudinal section of the sealing gasket 3 is I-shaped and covers and is fixed on the annular protrusion 2c.

[0033] Example 3

[0034] The structure and principle of this embodiment are basically the same as those of Embodiment 2, the difference being: (Refer to...) Figure 6 The bottom wall of the receiving groove 2a has an upwardly recessed groove 2d, and the sealing gasket 3 has an insert 3b that is abutted and fixed to the inner wall of the groove 2d.

[0035] Example 4

[0036] The structure and principle of this embodiment are basically the same as those of Embodiment 2, the difference being: (Refer to...) Figure 7 The surface of the annular protrusion 2c is conical, the upper longitudinal section of the sealing gasket 3 is inverted trapezoidal and is fixed against the inner wall of the receiving groove 2a, and the lower longitudinal section of the sealing gasket 3 is rectangular and is fixed against the edge of the groove of the receiving groove 2a.

[0037] Example 5

[0038] This embodiment and embodiment four have basically the same structure and principle, the difference being: (Refer to...) Figure 8 The bottom wall edge of the receiving groove 2a has a rounded corner 2e.

[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sealing and stable shut-off valve, comprising a valve body (1) and a valve core (2) movably disposed within the valve body (1), wherein the inner wall of the valve body (1) has a valve seat (1a) for communicating between the two ends of the valve body (1) and disposed vertically opposite to the valve core (2), characterized in that, The lower end of the valve core (2) has an upwardly recessed receiving groove (2a). The inner wall of the receiving groove (2a) has a limiting protrusion. The sealing gasket (3) is interference-fitted into the receiving groove (2a), and the limiting protrusion can limit the movement of the sealing gasket (3) along the axial and radial directions of the valve core (2). The lower end of the sealing gasket (3) protrudes from the receiving groove (2a) and can form a sealing abutment with the valve seat (1a) to separate the two ends of the valve body (1).

2. The sealing and stable shut-off valve according to claim 1, characterized in that, The limiting protrusion is an integrally formed protrusion (2b) on the bottom wall of the receiving groove (2a) with an inverted T-shaped longitudinal section, and the sealing gasket (3) covers and fixes the outer periphery of the protrusion (2b).

3. The sealing and stable shut-off valve according to claim 1, characterized in that, The limiting protrusion is an annular protrusion (2c) integrally formed on the inner side wall of the accommodating groove (2a) and protruding radially along the valve core (2). The longitudinal section of the sealing gasket (3) is I-shaped and covers and is fixed on the annular protrusion (2c).

4. The sealing and stable shut-off valve according to claim 3, characterized in that, The bottom wall of the receiving groove (2a) has an upwardly recessed groove (2d), and the sealing gasket (3) has an insert (3b) that is abutted and fixed to the inner wall of the groove (2d).

5. A sealing and stable shut-off valve according to claim 3, characterized in that, The surface of the annular protrusion (2c) is conical, the upper longitudinal section of the sealing gasket (3) is inverted trapezoidal and is fixed against the inner wall of the receiving groove (2a), and the lower longitudinal section of the sealing gasket (3) is rectangular and is fixed against the edge of the groove of the receiving groove (2a).

6. A sealing and stable shut-off valve according to claim 5, characterized in that, The bottom wall edge of the receiving groove (2a) has a rounded corner (2e).

7. A sealing and stable shut-off valve according to any one of claims 1-6, characterized in that, The outer wall of the sealing gasket (3) has an auxiliary sealing section (3a) with an L-shaped cross-section, and the auxiliary sealing section (3a) covers and is fixed on the outer wall of the receiving groove (2a).

8. A sealing and stable shut-off valve according to claim 7, characterized in that, The valve core (2) has an annular step (2f) located above the receiving groove (2a), and the upper end of the auxiliary sealing section (3a) is flush with the annular step (2f).

9. A sealing and stable shut-off valve according to any one of claims 1-6, characterized in that, The valve core (2) includes a columnar valve stem (4) and a block-shaped valve disc (5) connected to the lower end of the valve stem (4), and the receiving groove (2a) is located on the valve disc (5).

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