Double-sealing gate valve

Abstract

The utility model discloses a double-seal gate valve which comprises a valve body with a valve cavity, a valve plate used for separating the valve cavity, a valve cover connected with the valve body and a valve rod in threaded connection with the valve plate, the valve rod penetrates through the valve cover and extends into the valve cavity, and the valve rod is provided with an O-shaped ring. A packing and a pressing ring are arranged between the valve rod and the valve cover, the top of the valve cover is connected with a pressing cap, a straining ring is arranged in the valve cover, and the O-shaped ring is located between the straining ring and the packing. The utility model provides a double-sealing gate valve. The double-sealing gate valve is remarkably improved in the aspects of sealing performance, operability and reliability. The valve can better meet the requirements of the industry and the pipeline control field for the valve, and a more reliable fluid control solution is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, and more specifically to a double-channel sealing gate valve. Background Art

[0002] The gate valve is a commonly used fluid control valve used to cut off or regulate the flow of fluid in a pipeline. It consists of a valve body, a valve cover, a valve stem and a gate. The gate valve works by controlling the flow of fluid by moving the gate up and down. When the gate moves upward, the fluid can flow through the passage of the valve body; when the gate moves downward, the gate is in close contact with the valve seat to prevent the fluid from passing. This design gives the gate valve good sealing performance, which can effectively cut off the flow of fluid and prevent leakage.

[0003] A lifting rod type stuffing gate valve is disclosed in the Chinese utility model patent with authorization announcement number CN202884235U, which is mainly composed of a valve body, a valve cover, a gate plate, a valve stem, a stuffing and a hand wheel, and the stuffing box between the valve stem and the valve cover adopts an open structure with an open top, and then the stuffing retaining ring and the stuffing are installed in turn, and the top of the stuffing is tightened by a pressure ring and a clamping nut.

[0004] The above patent has been improved to an open-top stuffing box structure, so the valve stem can be easily installed into the valve cover from the top, and the packing and packing retaining ring can be taken out by simply opening the compression nut and the compression ring. However, due to a certain mechanical error between the valve stem and the valve cover, leakage is likely to occur between the valve stem and the valve cover after long-term use, causing safety hazards. Summary of the invention

[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model proposes a double-way sealing gate valve.

[0006] The technical solution adopted by the utility model is to provide a double-way sealing gate valve, including a valve body with a valve cavity, a valve plate for isolating the valve cavity, a valve cover connected to the valve body and a valve stem threadedly connected to the valve plate, the valve stem passes through the valve cover and extends into the valve cavity, and the valve stem is provided with an O-ring, a packing and a pressure ring are provided between the valve stem and the valve cover, a pressure cap is connected to the top of the valve cover, a tight ring is provided in the valve cover, and the O-ring is located between the tight ring and the packing.

[0007] The double-channel sealing valve of the utility model has the following advantages:

[0008] 1. The double-channel sealing structure is adopted. Through the combination of O-ring, packing and pressure ring, double sealing between valve stem and valve cover is realized, which improves the sealing performance of the valve and effectively prevents leakage.

[0009] 2. The valve stem is rotatably mounted on the valve cover through the axial constraints of the pressure cap and the tightening ring, making the operation of the valve stem more flexible and convenient.

[0010] 3. By rotating the valve stem, the valve stem can drive the valve plate to move vertically up and down to open and close the valve cavity. The operation is simple and the control is precise.

[0011] 4. The tight ring design is adopted to enhance the bearing capacity and stability of the valve cover, and improve the service life and reliability of the valve.

[0012] Compared with the traditional technology, the double-way sealing valve of the utility model has significant improvements in sealing, operability and reliability. It can better meet the requirements of valves in the fields of industry and pipeline control and provide a more reliable fluid control solution.

[0013] According to one embodiment of the utility model, the valve stem is provided with a second boss, and the tightening ring is pressed against the second boss to assemble the valve stem on the valve cover; the second boss is seated on the tightening ring, and the tightening ring is installed in the valve cover to fix the valve stem on the valve cover.

[0014] According to an embodiment of the utility model, the valve stem is provided with a first boss, and the first boss is spaced apart from the second boss to form an annular groove for installing an O-ring.

[0015] According to an embodiment of the utility model, a mouth ring is provided between the valve body and the valve cover; the valve body and the valve cover are threadedly connected, and the mouth ring is provided to increase the sealing between the two.

[0016] According to one embodiment of the utility model, the tightening ring is a sheet metal structure roughly in the shape of a truncated cone, and its upper end has a circular tightening portion; the second boss is located on the tightening portion, and the valve stem passes through the through hole in the center of the tightening portion and extends into the valve body to be threadedly connected to the raft plate.

[0017] According to one embodiment of the utility model, a plurality of notches are provided on the lower edge of the side of the tightening ring, and the notches are evenly distributed around the circumference of the tightening ring; the notches are provided to provide gaps for deformation in the circumference of the tightening ring, and the tightening ring is assembled on the valve cover by utilizing the elastic deformation of its side portion.

[0018] According to an embodiment of the present invention, the tightening ring is made of stainless steel.

[0019] According to an embodiment of the utility model, the tightening ring is a stainless steel stamping part. The use of the stainless steel stamping part can save processing costs and improve processing efficiency.

[0020] According to an embodiment of the utility model, the upper end of the valve stem is connected to a hand wheel via a nut.

[0021] According to an embodiment of the utility model, a label is provided between the nut and the hand wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A cross-sectional view of a valve in an embodiment of the utility model;

[0024] Figure 2 A three-dimensional diagram of a valve in an embodiment of the utility model;

[0025] Figure 3 A half-section view of a valve in an embodiment of the utility model;

[0026] Figure 4 An exploded view of a valve in an embodiment of the utility model;

[0027] Figure 5 A three-dimensional diagram of a filler in an embodiment of the utility model;

[0028] Figure 6 A three-dimensional diagram of a tightening ring in an embodiment of the utility model;

[0029] Figure 7 A three-dimensional diagram of a valve plate in an embodiment of the utility model;

[0030] Figure 8 It is a three-dimensional diagram of the valve stem in the embodiment of the utility model.

[0031] Description of the numbers in the figure:

[0032] 1. Valve plate; 2. Valve body; 3. Valve stem; 4. Mouth ring; 5. Tightening ring; 6. Valve cover; 7. Packing; 8. Pressing ring; 9. Pressing cap; 10. Hand wheel; 11. Label; 12. Nut; 13. O-ring;

[0033] 1a, first connection end; 1b, second connection end; 1c, valve chamber;

[0034] 31. first shoulder; 32. second shoulder; 33. annular groove;

[0035] 51. Tightening portion; 52. Notch. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] like Figure 1-8 As shown, in this embodiment, a double-way sealing gate valve is disclosed, including a valve body 2 with a valve cavity 1c, a valve plate 1 for isolating the valve cavity 1c, a valve cover 6 connected to the valve body 2, and a valve stem 3 threadedly connected to the valve plate 1, the valve stem 3 passes through the valve cover 6 and extends into the valve cavity 1c, and the valve stem 3 is provided with an O-ring 13, a packing 7 and a pressing ring 8 are provided between the valve stem 3 and the valve cover 6, a pressing cap 9 is connected to the top of the valve cover 6, a tight ring 5 is provided in the valve cover 6, and the O-ring 13 is located between the tight ring 5 and the packing 7.

[0038] Furthermore, combined with Figure 1-4 As shown, the valve cavity 1c in the valve body 2 is roughly in the shape of an inverted T, and the valve body 2 adopts a three-way structure. The opening at its upper end is threadedly connected to a valve cover 6, and a mouth ring 4 is provided between the valve cover 6 and the valve body 2. The mouth ring 4 is a rubber sealing ring with a rectangular cross section. The valve body 2 has a first connecting end 1a and a second connecting end 1b connected to the valve cavity 1c. Both the first connecting end 1a and the second connecting end 1b have selected internal threads. In other embodiments, the first connecting end 1a is an internal thread interface, and the second connecting end 1b is an external thread joint. Or both the first connecting end 1a and the second connecting end 1b are external thread joints, or the first connecting end 1a is a movable joint, and the second connecting end 1b is an external thread joint.

[0039] Furthermore, combined with Figure 7 As shown, the valve plate 1 has a certain taper, which is used to separate the valve cavity 1c and to intercept the flow channel formed by the first connecting end 1a, the valve cavity 1c and the second connecting end 1b.

[0040] Furthermore, combined with Figure 4As shown, the assembly method of the valve in this embodiment is as follows: first, an O-ring 13 is installed on the outer periphery of the valve cover 6. Then, the valve stem 3 is assembled on the valve cover 6 from bottom to top, and the upper end of the valve stem 3 extends out of the valve cover 6. The tight ring 5 is installed in the valve cover 6, and the elastic deformation of the tight ring 5 is used to firmly fix it on the inner top of the valve cover 6, and the tight ring 5 performs axial support on the valve stem 3. Then, the packing 7 and the pressure ring 8 are sequentially installed in the upper end of the valve cover 6, and finally, the pressure cap 9 is threadedly connected to the upper end of the valve cover 6, so as to compress and seal the packing 7 through the pressure ring 8. Then, the raft plate is threadedly connected to the bottom of the valve stem 3, and the upper end of the valve stem 3 is assembled with the hand wheel 10, the label 11 and the nut 12 in sequence. Finally, the mouth ring 4 is assembled on the valve body 2, and the valve cover 6 with the valve stem 3 is threadedly connected to the valve body 2 as a whole, so as to complete the assembly of the double-channel sealing valve.

[0041] Specifically, combined Figure 8 As shown, the valve stem 3 is provided with a second boss 32, and the tightening ring 5 is pressed against the second boss 32 to assemble the valve stem 3 on the valve cover 6. The valve stem 3 is provided with a first boss 31, and the first boss 31 and the second boss 32 are spaced apart to form an annular groove 33 for installing the O-ring 13.

[0042] Furthermore, in this embodiment, the annular groove 33 is adapted to the O-ring 13 , and the first boss 31 is tightly pressed against the inner boss in the through hole of the valve cover 6 .

[0043] Specifically, combined Figure 6 As shown, the tightening ring 5 is a sheet metal structure in a roughly truncated cone shape, with a circular abutting portion 51 at its upper end, four notches 52 are provided at the lower edge of the side of the tightening ring 5, and the notches 52 are evenly distributed around the circumference of the tightening ring 5, and the tightening ring 5 is made of stainless steel. Specifically, the tightening ring 5 is a stainless steel stamping part, and the use of stainless steel stamping parts can save processing costs and improve processing efficiency.

[0044] Furthermore, in this embodiment, the upper portion of the tightening ring 5 is annular, and four elastic legs are obliquely extended downward from the outer edge of the annular ring, and there are gaps 52 between the elastic legs. The elastic legs made of stainless steel are elastically deformed to install the pressing ring 8 in the valve cover 6.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A double-way sealing gate valve, comprising a valve body having a valve cavity, a valve plate for isolating the valve cavity, a valve cover connected to the valve body, and a valve stem threadedly connected to the valve plate, characterized in that: The valve stem passes through the valve cover and extends into the valve cavity, and the valve stem is provided with an O-ring, a packing and a pressure ring are provided between the valve stem and the valve cover, a pressure cap is connected to the top of the valve cover, a tight ring is provided in the valve cover, and the O-ring is located between the tight ring and the packing.

2. A double-pass sealing gate valve according to claim 1, characterized in that: The valve stem is provided with a second convex shoulder, and the tightening ring is pressed against the second convex shoulder to assemble the valve stem on the valve cover.

3. A double-pass sealing gate valve according to claim 2, characterized in that: The valve stem is provided with a first boss, and the first boss is spaced apart from the second boss to form an annular groove for installing an O-ring.

4. A double-pass sealing gate valve according to claim 1, characterized in that: A mouth ring is arranged between the valve body and the valve cover.

5. A double-pass sealing gate valve according to claim 1, characterized in that: The tightening ring is a sheet metal structure that is roughly truncated cone-shaped, and has a circular ring-shaped tightening portion at its upper end.

6. A double-pass sealing gate valve according to claim 5, characterized in that: A plurality of notches are arranged on the lower edge of the side surface of the tightening ring, and the notches are evenly distributed around the circumference of the tightening ring.

7. A double-pass sealing gate valve according to claim 1, characterized in that: The tightening ring is made of stainless steel.

8. A double-pass sealing gate valve according to claim 7, characterized in that: The tightening ring is a stainless steel stamping part.

9. A double-pass sealing gate valve according to claim 1, characterized in that: The upper end of the valve stem is connected with a hand wheel through a nut.

10. A double-pass sealing gate valve according to claim 1, characterized in that: The valve body has a first connection end and a second connection end communicated with the valve cavity, and at least one of the first connection end and the second connection end has a connection structure selected from an internal thread, an external thread, and a flexible joint.

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