Cage type single-seat regulating valve with good sealing performance

Abstract

The utility model belongs to the field of valves, and particularly relates to a cage type single-seat regulating valve with good sealing performance, which comprises a valve body, a valve cover, a pneumatic actuating mechanism and a valve core component, the valve core component comprises a valve rod, a valve core, a valve seat and a sleeve, and a metal sealing ring and a guide sealing ring are sequentially stacked in the sleeve. An elastic expansion ring is arranged in the metal sealing ring, the metal sealing ring is in sealing fit with the sleeve, the valve seat and the valve element, and the guide sealing ring is in sealing fit with the sleeve and the valve element. The structure stability of the metal sealing ring can be kept in a high-temperature environment, the metal sealing ring effectively compensates gap changes caused by thermal expansion and cold contraction through continuous pressing force, the built-in elastic expansion ring can provide continuous elastic force compensation for the metal sealing ring to adapt to different pressure changes, and the dynamic sealing performance under the high-temperature working condition is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a cage-type single-seat regulating valve with good sealing performance. Background Technology

[0002] Cage-type single-seat control valves are widely used in applications requiring high reliability and shut-off performance, such as high-temperature and high-pressure process pipelines in chemical, power, papermaking, food, metallurgy, and mining industries. Due to their compact structure, large output force, and compatibility with various actuators, including pneumatic and electric actuators, they are widely used in various industrial sectors.

[0003] The existing cage-type single-seat control valve uses a sealing ring (soft seal) between the valve core, valve seat, and sleeve to achieve sealing. When used in high-temperature environments, the gap change of the sealing ring due to thermal expansion and contraction causes the dynamic sealing performance of the cage-type single-seat control valve to be unreliable under high-temperature conditions, resulting in a low leakage level. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a cage-type single-seat regulating valve with good sealing performance, which can effectively improve the dynamic sealing performance under high temperature conditions.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A cage-type single-seat regulating valve with good sealing performance includes a valve body, a valve cover disposed on the valve body, a pneumatic actuator and a valve core assembly disposed on the valve cover, the valve core assembly including a valve stem that is linked to the pneumatic actuator, a valve core disposed on the valve stem, a valve seat disposed in the valve body, and a sleeve disposed on the valve seat, wherein a metal sealing ring and a guide sealing ring are sequentially stacked inside the sleeve, an elastic expansion ring is disposed inside the metal sealing ring, the metal sealing ring is sealed with the sleeve, the valve seat and the valve core, and the guide sealing ring is sealed with the sleeve and the valve core.

[0006] In some embodiments, the metal sealing ring has a cavity for accommodating an elastic expansion ring, and the outer wall of the metal sealing ring is provided with an annular opening communicating with the cavity.

[0007] In some embodiments, the annular opening of the metal sealing ring is oriented toward the valve seat.

[0008] In some embodiments, the cross-sectional shape of the metal sealing ring is U-shaped or C-shaped.

[0009] In some embodiments, the inner wall of the sleeve is provided with positioning grooves that match the metal sealing ring and the guide sealing ring, and the metal sealing ring and the guide sealing ring are engaged in the positioning grooves.

[0010] In some embodiments, a sealing gasket is provided between the valve body and the valve seat.

[0011] In some embodiments, the valve cover is provided with a convex ring that cooperates with the sleeve and the valve body, and a sealing groove that cooperates with the convex ring is formed between the sleeve and the valve body, and the convex ring is engaged in the sealing groove.

[0012] In some embodiments, a sealing ring is provided in the sealing groove to seal with the sleeve, valve body, and convex ring.

[0013] In some embodiments, a double-ended bolt is connected between the valve cover and the valve body, and a nut for tightening the valve cover is provided on the double-ended bolt.

[0014] In some embodiments, a sealing gasket is provided between the valve cover and the valve body at the location corresponding to the double-ended bolt, thereby forming a sealing fit between the sealing gasket and the valve cover, valve body, and double-ended bolt.

[0015] The beneficial effects of this utility model are as follows: the metal sealing ring can maintain structural stability in high-temperature environments. Through continuous clamping force, the metal sealing ring effectively compensates for gap changes caused by thermal expansion and contraction. The built-in elastic tightening ring can provide continuous elasticity compensation for the metal sealing ring to adapt to different pressure changes, ensuring dynamic sealing performance under high-temperature conditions. Especially in liquid and gas sealing, the metal sealing ring, made of metal material, has a stronger ability to maintain its shape under high pressure. Furthermore, the guide sealing ring (soft seal) and the metal sealing ring (hard seal) form a composite sealing structure. Through the synergistic effect of soft and hard seals, the leakage risk of this single-seat regulating valve is further reduced. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a structural diagram of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0019] Figure 3 This is a front view of the metal sealing ring according to an embodiment of the present invention. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0024] like Figure 1-3As shown, a cage-type single-seat regulating valve with good sealing performance includes a valve body 1, a valve cover 2 disposed on the valve body 1, a pneumatic actuator 3 disposed on the valve cover 2, and a valve core assembly 4. The valve core assembly 4 includes a valve stem 41 that is linked to the pneumatic actuator 3, a valve core 42 that is linked to the valve stem 41, a valve seat 43 disposed in the valve body 1, and a sleeve 44 disposed on the valve seat 43. A metal sealing ring 45 and a guide sealing ring 46 are stacked sequentially inside the sleeve 44. An elastic expansion ring 47 is disposed inside the metal sealing ring 45. The metal sealing ring 47 is sealed in cooperation with the sleeve 44, the valve seat 43, and the valve core 42. The guide sealing ring 46 is sealed in cooperation with the sleeve 44 and the valve core 42. The metal sealing ring maintains structural stability at high temperatures. Through continuous clamping force, it effectively compensates for gap changes caused by thermal expansion and contraction. The built-in elastic expansion ring provides continuous elasticity to adapt to different pressure changes, ensuring dynamic sealing performance under high-temperature conditions. Especially in liquid and gas seals, the metal sealing ring, made of metal, has a stronger ability to maintain its shape under high pressure. Furthermore, the guide sealing ring (soft seal) and the metal sealing ring (hard seal) form a composite sealing structure. Through the synergistic effect of soft and hard seals, the leakage risk of this single-seat control valve is further reduced. The metal sealing ring 45 has a cavity 451 that accommodates the elastic expansion ring 47. An annular opening 452 communicating with the cavity 451 is provided on the outer wall of the metal sealing ring 45. The annular opening 452 of the metal sealing ring 45 faces towards the valve seat. The cross-sectional shape of the metal sealing ring 45 is U-shaped or C-shaped. An annular opening is provided on the metal sealing ring. Under high-temperature conditions, the metal sealing ring can effectively compensate for gap changes caused by thermal expansion and contraction, thereby improving the sealing performance of the single-seat regulating valve. Positioning grooves 441, matching the metal sealing ring 45 and the guide sealing ring 46, are respectively provided on the inner wall of the sleeve 44. The metal sealing ring 45 and the guide sealing ring 46 are engaged within the positioning grooves 441. The positioning grooves serve to position the metal sealing ring and the guide sealing ring, facilitating the assembly of the metal sealing ring and the guide sealing ring with the sleeve and ensuring the sealing performance of the metal sealing ring and the guide sealing ring.

[0025] like Figure 1As shown, a sealing gasket 48 is provided between the valve body 1 and the valve seat 43. The sealing gasket enhances the sealing performance between the valve body and the valve seat. A convex ring 21 is provided on the valve cover 2 to mate with the sleeve 44 and the valve body 1. A sealing groove 11 is formed between the sleeve 44 and the valve body 1 to mate with the convex ring 21, and the convex ring 21 is engaged within the sealing groove 11. The valve cover is engaged within the sealing groove between the sleeve and the valve body by the convex ring, thus facilitating the assembly of the valve cover with the sleeve and the valve body, resulting in higher assembly efficiency. A sealing ring 12 is provided within the sealing groove 11 to seal with the sleeve 44, the valve body 1, and the convex ring 21. The sealing ring enhances the sealing performance between the valve cover and the valve body and the sleeve. A double-ended bolt 13 connects the valve cover 2 and the valve body 1, and a nut 14 is provided on the double-ended bolt 13 for tightening the valve cover 2. A sealing washer 15 is provided between the valve cover 2 and the valve body 1 at the location corresponding to the double-ended bolt 13, forming a sealing fit between the sealing washer 15 and the valve cover 2, the valve body 1, and the double-ended bolt 13.

[0026] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A cage-type single-seat regulating valve with good sealing performance, comprising a valve body, a valve cover disposed on the valve body, and a pneumatic actuator and valve core assembly disposed on the valve cover, characterized in that: The valve core assembly includes a valve stem that is linked to the pneumatic actuator, a valve core that is linked to the valve stem, a valve seat that is disposed in the valve body, and a sleeve that is disposed in the valve seat. A metal sealing ring and a guide sealing ring are stacked in sequence inside the sleeve. An elastic expansion ring is disposed inside the metal sealing ring. The metal sealing ring is in sealing cooperation with the sleeve, the valve seat, and the valve core. The guide sealing ring is in sealing cooperation with the sleeve and the valve core.

2. The cage-type single-seat regulating valve with good sealing performance according to claim 1, characterized in that: The metal sealing ring has a cavity for accommodating an elastic expansion ring, and an annular opening communicating with the cavity is provided on the outer wall of the metal sealing ring.

3. The cage-type single-seat regulating valve with good sealing performance according to claim 2, characterized in that: The annular opening of the metal sealing ring is oriented towards the valve seat.

4. The cage-type single-seat regulating valve with good sealing performance according to claim 1 or 2, characterized in that: The cross-sectional shape of the metal sealing ring is U-shaped or C-shaped.

5. The cage-type single-seat regulating valve with good sealing performance according to claim 1 or 2, characterized in that: The inner wall of the sleeve is provided with positioning grooves that match the metal sealing ring and the guide sealing ring, and the metal sealing ring and the guide sealing ring are engaged in the positioning grooves.

6. The cage-type single-seat regulating valve with good sealing performance according to claim 1 or 2, characterized in that: A sealing gasket is provided between the valve body and the valve seat.

7. The cage-type single-seat regulating valve with good sealing performance according to claim 1, characterized in that: The valve cover is provided with a convex ring that mates with the sleeve and the valve body. A sealing groove is formed between the sleeve and the valve body that mates with the convex ring, and the convex ring is engaged in the sealing groove.

8. The cage-type single-seat regulating valve with good sealing performance according to claim 7, characterized in that: The sealing groove is provided with a sealing ring that cooperates with the sleeve, valve body, and convex ring.

9. The cage-type single-seat regulating valve with good sealing performance according to claim 1, characterized in that: The valve cover and the valve body are connected by a double-ended bolt, and the double-ended bolt is provided with a nut for tightening the valve cover.

10. The cage-type single-seat regulating valve with good sealing performance according to claim 9, characterized in that: A sealing gasket is provided between the valve cover and the valve body at the corresponding double-ended bolt, forming a sealing fit between the sealing gasket and the valve cover, valve body, and double-ended bolt.

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