CN-224229288-U - 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 assembly, wherein the valve core assembly comprises a valve rod, a valve core, a valve seat and a sleeve, a metal sealing ring and a guide sealing ring are sequentially arranged in the sleeve in a lamination manner, 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 core, the guide sealing ring is in sealing fit with the sleeve and the valve core, the metal sealing ring can keep structural stability in a high-temperature environment, the metal sealing ring effectively compensates gap change caused by thermal expansion and contraction through continuous pressing force, and the built-in elastic expansion ring can provide continuous elastic compensation for the metal sealing ring to adapt to different pressure changes, so that the dynamic sealing performance under the high-temperature working condition is ensured.

Inventors

• CHEN JIAN
• CHEN HAIHAN
• MA JIANSHE
• LIAO JIACHENG
• LI WENDI

Assignees

• 高特自控阀门有限公司

Dates

Publication Date

20260512

Application Date

20250523

Claims (10)

1. 1. A cage type single-seat regulating valve with good sealing performance comprises a valve body, a valve cover arranged on the valve body, a pneumatic actuating mechanism arranged on the valve cover and a valve core assembly, and is characterized in that the valve core assembly comprises a valve rod in linkage fit with the pneumatic actuating mechanism, a valve core arranged on the valve rod in linkage, a valve seat arranged in the valve body and a sleeve arranged on the valve seat, a metal sealing ring and a guide sealing ring are sequentially arranged in the sleeve in a stacked mode, 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 core, and the guide sealing ring is in sealing fit with the sleeve and the valve core.
2. 2. The single-seat cage-type regulating valve with good sealing performance according to claim 1, wherein the metal sealing ring is provided with a cavity for accommodating the elastic expansion ring, and an annular opening communicated with the cavity is arranged on the outer wall of the metal sealing ring.
3. 3. The single-seat cage-type regulating valve with good sealing performance according to claim 2, wherein the annular opening of the metal sealing ring is arranged towards the valve seat.
4. 4. The cage type single-seat regulating valve with good sealing performance according to claim 1 or 2, wherein the cross section of the metal sealing ring is U-shaped or C-shaped.
5. 5. The cage type single-seat regulating valve with good sealing performance according to claim 1 or 2 is characterized in that positioning grooves matched with the metal sealing rings and the guide sealing rings are respectively arranged on the inner wall of the sleeve, and the metal sealing rings and the guide sealing rings are clamped in the positioning grooves.
6. 6. The cage type single-seat regulating valve with good sealing performance according to claim 1 or 2, wherein a sealing gasket is arranged between the valve body and the valve seat.
7. 7. The single-seat cage-type regulating valve with good sealing performance according to claim 1, wherein the valve cover is provided with a convex ring matched with the sleeve and the valve body, a sealing groove matched with the convex ring is formed between the sleeve and the valve body, and the convex ring is clamped in the sealing groove.
8. 8. The cage type single-seat regulating valve with good sealing performance according to claim 7, wherein a sealing ring in sealing fit with the sleeve, the valve body and the convex ring is arranged in the sealing groove.
9. 9. The cage type single-seat regulating valve with good sealing performance according to claim 1, wherein a stud is connected between the valve cover and the valve body, and a nut for pressing the valve cover is arranged on the stud.
10. 10. The cage type single-seat regulating valve with good sealing performance according to claim 9, wherein a sealing gasket is arranged between the valve cover and the valve body corresponding to the stud bolts, and the sealing gasket is in sealing fit with the valve cover, the valve body and the stud bolts.

Description

Cage type single-seat regulating valve with good sealing performance Technical Field The utility model belongs to the technical field of valves, and particularly relates to a cage type single-seat regulating valve with good sealing performance. Background The cage type single seat regulating valve is widely applied to occasions requiring high reliability and closing performance, such as high-temperature and high-pressure process pipelines in the fields of chemical industry, electric power, papermaking, food, metallurgy, mining and the like. The device has compact structure and large output force, and can be matched with various actuating mechanisms such as pneumatic and electric actuators, so that the device has wide application in various industrial fields. Sealing rings (soft sealing) are adopted between the valve core, the valve seat and the sleeve of the existing cage type single-seat regulating valve to realize sealing, when the cage type single-seat regulating valve is used in a high-temperature environment, the dynamic sealing performance of the cage type single-seat regulating valve under the high-temperature working condition is unreliable due to the gap change caused by expansion caused by contraction caused by heat of the sealing rings, and the defect of low leakage level exists. Disclosure of Invention The utility model aims to overcome the defects and the shortcomings of the prior art, and provides a cage type single-seat regulating valve with good sealing performance, which can effectively improve the dynamic sealing performance under a high-temperature working condition. The cage type single-seat regulating valve comprises a valve body, a valve cover arranged on the valve body, a pneumatic actuating mechanism arranged on the valve cover and a valve core assembly, wherein the valve core assembly comprises a valve rod in linkage fit with the pneumatic actuating mechanism, a valve core arranged on the valve rod in linkage mode, a valve seat arranged in the valve body and a sleeve arranged on the valve seat, a metal sealing ring and a guide sealing ring are sequentially arranged in the sleeve in a laminated mode, 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 core, and the guide sealing ring is in sealing fit with the sleeve and the valve core. In some embodiments, the metal sealing ring is provided with a cavity for accommodating the elastic expansion ring, and the outer wall of the metal sealing ring is provided with an annular opening communicated with the cavity. In some embodiments, the annular opening of the metal seal ring is disposed toward the valve seat. In some embodiments, the cross-sectional shape of the metal seal ring is U-shaped or C-shaped. In some embodiments, positioning grooves matched with the metal sealing ring and the guide sealing ring are respectively formed in the inner wall of the sleeve, and the metal sealing ring and the guide sealing ring are clamped in the positioning grooves. In some embodiments, a sealing gasket is disposed between the valve body and the valve seat. In some embodiments, the valve cover is provided with a convex ring matched with the sleeve and the valve body, a sealing groove matched with the convex ring is formed between the sleeve and the valve body, and the convex ring is clamped in the sealing groove. In some embodiments, a sealing ring in sealing fit with the sleeve, the valve body and the convex ring is arranged in the sealing groove. In some embodiments, a stud is connected between the valve cover and the valve body, and a nut for pressing the valve cover is arranged on the stud. In some embodiments, a sealing gasket is arranged between the valve cover and the valve body corresponding to the stud, and the sealing gasket is in sealing fit with the valve cover, the valve body and the stud. The utility model has the advantages that the metal sealing ring can maintain structural stability in a high-temperature environment, the metal sealing ring effectively compensates gap change caused by thermal expansion and cold contraction through continuous pressing force, the built-in elastic expansion ring can provide continuous elastic force for the metal sealing ring to compensate and adapt to different pressure changes, the dynamic sealing performance under high-temperature working conditions is ensured, particularly in liquid and gas sealing, the metal sealing ring has stronger capability of keeping the shape under high pressure by adopting metal materials, and the guide sealing ring (soft sealing piece) and the metal sealing ring (hard sealing) form a composite sealing structure, and the leakage risk of the single-seat regulating valve is further reduced through the synergistic effect of soft sealing and hard sealing. Drawings In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, th