Dual seal clean shut-off valve

Abstract

The utility model provides a kind of double sealing clean type stop valve, belong to stop valve technical field, including valve body, valve rod, valve core, valve seat and bonnet, the throttle opening is provided in the valve body, the valve seat is set in throttle opening, it includes outer conical sealing part and inner conical sealing part, the outside of valve core is provided with the soft sealing element of sealing cooperation with outer conical sealing part and the hard sealing element of sealing cooperation with inner conical sealing part, and the lower side of hard sealing element on it is provided with elastic scraper ring, the section of elastic scraper ring is U shape, when it moves towards valve seat with valve core, and its arc end wipes inner conical sealing part;The utility model forms soft and hard double sealing structure, improves the sealing reliability of valve;Meanwhile in the process of valve closing, the arc end of elastic scraper ring can automatically wipe inner conical sealing surface, effectively remove adhered solid particles, avoid particle pinch injury sealing surface, prolong the service life of valve.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a double-sealed cleaning gate valve. Background Technology

[0002] Gate valves, as one of the most commonly used shut-off valves in pipeline systems, are widely used in industries such as petroleum, chemical, power, metallurgy, and wastewater treatment. They are primarily used to control the flow and control of fluids. The general structure of existing gate valves mainly includes a valve body, valve stem, valve core, valve seat, and valve cover. Turning the handwheel drives the valve stem to move up and down, causing the valve core and valve seat sealing surfaces to engage or disengage, thus closing or opening the valve. Their simple structure and convenient operation make them important in medium and low-pressure pipeline systems.

[0003] However, when conveying media containing solid particles, existing gate valves suffer from a high risk of particle adhesion to the valve seat sealing surface. When the valve is closed, these particles become trapped between the valve core and the valve seat sealing surface, causing scratches and wear, leading to seal failure. Furthermore, most gate valves employ a single sealing structure, making them prone to leakage under high-pressure conditions. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a double-sealed cleaning shut-off valve.

[0005] The technical solution adopted by this utility model is as follows: This application provides a double-sealed cleaning type gate valve, including a valve body, a valve stem, a valve core, a valve seat, and a valve cover. The valve body is provided with a throttling orifice, and the valve seat is provided at the throttling orifice. It includes an outer conical sealing part and an inner conical sealing part. The outer side of the valve core is provided with a soft sealing element that seals with the outer conical sealing part and a hard sealing element that seals with the inner conical sealing part. An elastic scraper ring is provided on the lower side of the hard sealing element. The cross-section of the elastic scraper ring is U-shaped. When it moves with the valve core toward the valve seat, its arc-shaped end wipes the inner conical sealing part.

[0006] In some embodiments, the outer wall of the arc-shaped end of the elastic scraper ring is provided with a plurality of scraper blades at intervals, and the cross-section of the scraper blades is triangular.

[0007] In some embodiments, an arc-shaped transition portion and an avoidance cone portion with the opposite slope to the inner conical sealing portion are sequentially provided on the valve seat below the inner conical sealing portion.

[0008] In some embodiments, the inner ring of the elastic scraper ring is provided with a fixing ring, and the two are integrally formed. The fixing ring is threadedly connected to the valve core, and the hard seal abuts between the fixing ring and the valve core.

[0009] In some embodiments, the bottom of the valve core is provided with a flow guide cone, the taper of which is greater than the taper of the hard seal.

[0010] In some embodiments, the outer surface of the guide cone is provided with a plurality of spiral guide grooves.

[0011] In some embodiments, the valve cover is connected to the valve body by bolts, the stuffing box is disposed in the center hole of the valve cover, and the valve stem passes through the stuffing box and is connected to a handwheel.

[0012] In some embodiments, a packing gland is provided on the top of the stuffing box, the packing gland is connected to the valve cover by adjusting bolts, a plurality of packings are provided inside the stuffing box, a pressure sleeve is provided between the packing gland and the stuffing box, a first pressing part is provided at one end of the pressure sleeve near the packing gland, and a second pressing part is provided on the packing gland corresponding to the first pressing part, both the first pressing part and the second pressing part are conical surfaces that are smaller at the top and larger at the bottom.

[0013] The beneficial effects of this utility model are as follows: By setting an outer conical sealing part and an inner conical sealing part on the valve seat, and combining them with the soft sealing part and the hard sealing part on the valve core to form a double sealing structure, the sealing reliability of the valve is improved; at the same time, a U-shaped elastic scraper ring is set on the valve core. During the valve closing process, the arc-shaped end of the elastic scraper ring can automatically wipe the inner conical sealing surface, effectively removing the attached solid particles, avoiding particles from damaging the sealing surface, and extending the service life of the valve. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of a double-sealed cleaning shut-off valve according to the present invention; Figure 2 This is a partial schematic diagram of a double-sealed cleaning shut-off valve according to the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the valve core and valve seat in this utility model; Figure 5 This is an exploded view of the valve core and valve seat in this utility model; Figure 6 This is a partial cross-sectional view of the stuffing box in this utility model; In the diagram: 1-Valve body, 2-Valve stem, 3-Valve core, 4-Valve seat, 5-Valve cover, 6-Throttle port, 7-Outer conical seal, 8-Inner conical seal, 9-Soft seal, 10-Hard seal, 11-Elastic scraper ring, 12-Scraper, 13-Arc-shaped transition, 14-Avoiding cone, 15-Fixing ring, 16-Guide cone, 17-Spiral guide groove, 18-Stuffing gland, 19-Handwheel, 20-Stuffing gland, 21-Adjusting bolt, 22-Stuffing, 23-Pressure sleeve, 24-First pressure part, 25-Second pressure part. Detailed Implementation

[0016] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0018] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0019] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0020] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of this application.

[0021] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0023] Most existing gate valves have a single sealing structure, which is insufficient in sealing performance. At the same time, during use, the sealing surface is easily adhered by particles, especially when conveying media containing solid particles, which seriously affects the sealing performance of the valve.

[0024] Based on the above issues, such as Figures 1 to 6 As shown, this utility model proposes a double-sealed cleaning shut-off valve, including a valve body 1, a valve stem 2, a valve core 3, a valve seat 4, and a valve cover 5. The valve body 1 has a throttling orifice 6 for fluid passage. The valve seat 4 is installed on the upper end face of the throttling orifice 6. The valve seat 4 adopts an integral structure, and its upper part is provided with a coaxial outer conical sealing part 7 and an inner conical sealing part 8. The valve core 3 is fixedly connected to the lower end of the valve stem 2. A soft sealing element 9 is embedded in the upper outer side of the valve core 3. The soft sealing element 9 can be made of polytetrafluoroethylene or nitrile rubber, which forms a first-level soft seal with the outer conical sealing part 7. A hard sealing element 10 is provided in the middle outer side of the valve core 3. The hard sealing element 10 can be made of hard alloy by overlay welding, which forms a second-level hard seal with the inner conical sealing part 8.

[0025] An elastic scraper ring 11 is provided on the valve core 3 below the hard seal 10. The cross-section of the elastic scraper ring 11 is U-shaped, with its arc-shaped end facing the valve seat 4. When the valve stem 2 moves the valve core 3 downward to close the valve, the arc-shaped end of the elastic scraper ring 11 first contacts the inner conical sealing part 8, using its own elasticity to tightly adhere to the sealing surface and wipe away the attached solid particles. Subsequently, the hard seal 10 and the soft seal 9 sequentially adhere to the corresponding sealing parts to complete the double seal.

[0026] Preferably, the outer conical sealing portion 7 contacts the soft sealing element 9 before the inner conical sealing portion 8 contacts the hard sealing element 10. Specifically, when the valve core closes downwards, the outer conical sealing portion 7 first contacts and adheres to the soft sealing element 9, forming a first-stage soft seal, which blocks most of the medium flow in advance and reduces the medium pressure difference when the subsequent hard sealing surface contacts. As the valve core continues to descend, the inner conical sealing portion 8 contacts the hard sealing element 10, forming a second-stage hard seal to withstand high-pressure sealing.

[0027] In some embodiments, the outer wall of the arc-shaped end of the elastic scraper ring 11 is provided with a plurality of scraper blades 12 spaced circumferentially. The cross-section of the scraper blades 12 is triangular, and its tip faces the inner conical sealing part 8, which can enhance the scraping ability of stubborn particles and ensure that the sealing surface is thoroughly cleaned.

[0028] In some embodiments, an arc-shaped transition portion 13 and a clearance cone portion 14 are sequentially arranged on the valve seat 4 below the inner conical sealing portion 8, wherein the slope direction of the clearance cone portion 14 is opposite to that of the inner conical sealing portion 8. The arc-shaped transition portion 13 and the clearance cone portion 14 not only prevent the elastic scraper ring 11 from getting stuck during movement, but also provide a falling channel for the scraped particles, preventing particles from accumulating below the sealing surface.

[0029] In some embodiments, the inner ring of the elastic scraper ring 11 is provided with a fixing ring 15. The fixing ring 15 and the elastic scraper ring 11 are integrally formed. The inner wall of the fixing ring 15 is provided with an internal thread, and the corresponding position of the valve core 3 is provided with an external thread. The fixing ring 15 is threadedly connected to the valve core 3. The lower end face of the hard seal 10 abuts against the upper end face of the fixing ring 15, and the upper end face of the hard seal 10 abuts against the stepped surface of the valve core 3. The fixing ring 15 enables the hard seal 10 and the elastic scraper ring 11 to be synchronously fixed, facilitating subsequent disassembly and replacement.

[0030] It is understood that a corresponding sealing structure is provided at the connection between the hard seal 10, the fixing ring 15 and the valve core 3.

[0031] In some embodiments, a flow guide cone 16 is provided at the bottom of the valve core 3. The taper of the flow guide cone 16 is greater than that of the hard seal 10. The flow guide cone 16 can guide the fluid smoothly into the throttle port 6 when the valve is opened, reduce the scouring of the bottom of the valve core 3 by the fluid, and reduce the fluid resistance.

[0032] In some embodiments, the outer surface of the guide cone 16 is provided with a plurality of spiral guide grooves 17, which extend spirally along the generatrix direction of the guide cone 16. The spiral guide grooves 17 can further optimize the fluid flow pattern, eliminate turbulence, and reduce the pressure loss of the valve.

[0033] In some embodiments, the valve cover 5 is connected to the upper flange of the valve body 1 by several bolts. A stuffing box 18 is provided in the central hole of the valve cover 5. The valve stem 2 passes through the stuffing box 18 and extends upward. A handwheel 19 is connected to the top of the valve stem 2 by a key. Rotating the handwheel 19 can drive the valve stem 2 to move up and down, thereby realizing the opening and closing operation of the valve.

[0034] In some embodiments, a packing gland 20 is provided at the top of the stuffing box 18, and the packing gland 20 is connected to the valve cover 5 by symmetrically arranged adjusting bolts 21. The stuffing box 18 is filled with several layers of packing 22. A pressure sleeve 23 is provided between the packing gland 20 and the stuffing box 18. A first pressing part 24 is provided at the upper end of the pressure sleeve 23, and a second pressing part 25 is provided at the lower end of the packing gland 20. Both the first pressing part 24 and the second pressing part 25 are tapered surfaces, smaller at the top and larger at the bottom. When the adjusting bolts 21 are tightened, the second pressing part 25 compresses the first pressing part 24, causing the pressure sleeve 23 to radially contract, uniformly transmitting the clamping force to the packing 22, improving the sealing effect at the valve stem 2, and preventing medium leakage along the valve stem.

[0035] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

[0036] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0037] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0038] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A double-sealed cleaning type shut-off valve, characterized in that, The valve includes a valve body, valve stem, valve core, valve seat, and valve cover. The valve body is provided with a throttling orifice, and the valve seat is located at the throttling orifice. It includes an outer conical sealing part and an inner conical sealing part. The outer side of the valve core is provided with a soft sealing element that seals with the outer conical sealing part and a hard sealing element that seals with the inner conical sealing part. An elastic scraper ring is provided on the lower side of the hard sealing element. The cross-section of the elastic scraper ring is U-shaped. When it moves with the valve core toward the valve seat, its arc-shaped end wipes the inner conical sealing part.

2. The double-sealed cleaning type shut-off valve according to claim 1, characterized in that, The outer wall of the arc-shaped end of the elastic scraper ring is provided with several scraper blades at intervals, and the cross-section of the scraper blades is triangular.

3. The double-sealed cleaning type shut-off valve according to claim 1, characterized in that, The valve seat is provided with an arc-shaped transition section and an avoidance cone section with the opposite slope to the inner conical sealing section, located below the inner conical sealing section.

4. The double-sealed cleaning type shut-off valve according to claim 1, characterized in that, The inner ring of the elastic scraper ring is provided with a fixing ring, and the two are integrally formed. The fixing ring is threadedly connected to the valve core, and the hard seal abuts between the fixing ring and the valve core.

5. A double-sealed cleaning-type shut-off valve according to claim 1, characterized in that, The bottom of the valve core is provided with a flow guide cone, the taper of which is greater than that of the hard seal.

6. A double-sealed cleaning-type shut-off valve according to claim 5, characterized in that, The outer surface of the guide cone is provided with several spiral guide grooves.

7. A double-sealed cleaning-type shut-off valve according to claim 1, characterized in that, The valve cover is connected to the valve body by bolts. A stuffing box is provided in the center hole of the valve cover, and the valve stem passes through the stuffing box and is connected to a handwheel.

8. A double-sealed cleaning-type shut-off valve according to claim 7, characterized in that, The top of the stuffing box is provided with a stuffing gland, which is connected to the valve cover by adjusting bolts. The stuffing box contains a number of packings. A pressure sleeve is provided between the stuffing gland and the stuffing box. A first pressing part is provided at one end of the pressure sleeve near the stuffing gland. A second pressing part is provided on the stuffing gland corresponding to the first pressing part. Both the first pressing part and the second pressing part are conical surfaces that are smaller at the top and larger at the bottom.

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