CN-224229282-U - Pneumatic needle type regulating valve

Abstract

The utility model belongs to the field of valves, and particularly relates to a pneumatic needle type regulating valve 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 and a valve core, a valve seat is arranged in the valve body, a valve cage is arranged on the valve seat, the valve core is in linkage fit with the valve rod, the valve core penetrates through the valve cage and extends in the valve seat, an arc surface contact part matched with the valve seat is arranged at the lower end of the valve core, the valve seat is provided with a convex ring part contacted with the arc surface contact part, the valve core adopts a needle type structural design, the valve core is contacted with the convex ring part of the valve seat through the arc surface contact part, the contact area of the valve core and the valve seat can be effectively reduced, the flow resistance can be effectively reduced, the sensitivity and the stability of micro flow control can be improved, and the flow cross section can be obviously changed due to small contact area, and the micro movement of the valve core is suitable for the accurate control of the micro flow.

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 pneumatic needle type 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, and is characterized in that the valve core assembly comprises a valve rod and a valve core which are in linkage fit with the pneumatic actuating mechanism, a valve seat is arranged in the valve body, a valve cage is arranged on the valve seat, the valve core is in linkage fit with the valve rod, the valve core penetrates through the valve cage and extends in the valve seat, the lower end of the valve core is provided with an arc surface contact part matched with the valve seat, and the valve seat is provided with a convex ring part contacted with the arc surface contact part.
2. 2. The pneumatic needle type regulating valve of claim 1, wherein a sealing assembly is arranged between the valve core and the valve seat, the sealing assembly comprises a sealing ring and a pressing ring for pressing the sealing ring, a positioning groove for placing the sealing ring is arranged in the valve seat, and the sealing ring is arranged in the positioning groove and forms sealing fit with the valve seat and the valve core.
3. 3. The pneumatic needle type regulating valve of claim 2, wherein the compression ring is in threaded connection with the valve seat, and the compression ring compresses the sealing ring in the positioning groove.
4. 4. A pneumatic needle type regulating valve as set forth in claim 1 or 2, wherein the lower end of the valve rod is provided with a connecting part extending in the valve cage, the connecting part is provided with a round table part matched with a valve seat, the valve seat is provided with a step part matched with the round table part, and the step part is provided with a limit inclined plane contacted with the round table part.
5. 5. The pneumatic needle type regulating valve of claim 4, wherein the connecting portion is provided with a threaded hole, the upper end of the valve core is provided with a screw portion, and the screw portion is connected in the threaded hole.
6. 6. The pneumatic needle type regulating valve of claim 1, wherein the upper end of the valve rod extends out of the valve cover and is connected with the pneumatic actuating mechanism, a packing assembly is arranged between the valve cover and the valve rod, the packing assembly comprises a packing gland and packing which are connected with the valve cover in a threaded manner, and the packing is arranged between the valve cover and the valve rod and between the packing gland.
7. 7. The pneumatic needle type regulating valve of claim 1, wherein the valve cover is in threaded connection with the valve body, and a sealing gasket is arranged between the valve cover and the valve body.
8. 8. The pneumatic needle type regulating valve of claim 1, wherein the valve cover is internally provided with a positioning groove matched with the valve cage, and the upper end of the valve cage is clamped in the positioning groove and forms limit fit of the valve cage and the valve cover.
9. 9. The pneumatic needle type regulating valve of claim 1, wherein the valve body is provided with an air inlet and an air outlet respectively, an air inlet channel communicated between the valve cavity and the air inlet is arranged in the valve body, and an air outlet channel communicated between the valve cavity and the air outlet is arranged in the valve body.
10. 10. The pneumatic needle type regulating valve of claim 9, wherein a plurality of air holes communicated with the exhaust passage are respectively arranged on the peripheral wall of the valve cage.

Description

Pneumatic needle type regulating valve Technical Field The utility model belongs to the technical field of valves, and particularly relates to a pneumatic needle type regulating valve. Background The pneumatic regulating valve is one kind of industrial automatic control instrument and has the core function of precisely regulating the flow, pressure, temperature, liquid level and other technological parameters of medium inside pipeline via receiving control system signal. The power source is compressed air, and the actuating mechanism (such as a cylinder or a diaphragm) converts air pressure into mechanical thrust to drive the valve core to move so as to change the opening of the valve, thereby realizing flow control. The valve core and the valve seat of the existing pneumatic regulating valve are large in contact area and large in flow resistance, so that the pneumatic regulating valve is low in sensitivity to micro flow control and has the defect of unreliable performance. Disclosure of Invention The utility model aims to overcome the defects and shortcomings in the prior art and provide a pneumatic needle type regulating valve which can effectively reduce flow resistance and improve sensitivity and stability of micro flow control. The pneumatic needle type 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 and a valve core which are in linkage fit with the pneumatic actuating mechanism, a valve seat is arranged in the valve body, a valve cage is arranged on the valve seat, the valve core is in linkage fit with the valve rod, the valve core penetrates through the valve cage and extends into the valve seat, the lower end of the valve core is provided with a cambered surface contact part matched with the valve seat, and the valve seat is provided with a convex ring part contacted with the cambered surface contact part. In some embodiments, a sealing component is arranged between the valve core and the valve seat, the sealing component comprises a sealing ring and a pressing ring used for pressing the sealing ring, a positioning groove used for placing the sealing ring is arranged in the valve seat, and the sealing ring is arranged in the positioning groove and forms sealing fit with the valve seat and the valve core. In some embodiments, the pressing ring is in threaded connection with the valve seat, and the pressing ring presses the sealing ring in the positioning groove. In some embodiments, the lower end of the valve rod is provided with a connecting part extending in the valve cage, the connecting part is provided with a round platform part matched with the valve seat, the valve seat is provided with a step part matched with the round platform part, and the step part is provided with a limiting inclined plane contacted with the round platform part. In some embodiments, the connecting portion is provided with a threaded hole, the upper end of the valve core is provided with a screw portion, and the screw portion is connected in the threaded hole. In some embodiments, the upper end of the valve rod extends outside the valve cover and is connected with the pneumatic actuating mechanism, a packing assembly is arranged between the valve cover and the valve rod, the packing assembly comprises a packing gland and packing which are connected with the valve cover in a threaded manner, and the packing is arranged between the valve cover and the valve rod as well as between the valve cover and the packing gland. In some embodiments, the valve cover is in threaded connection with the valve body, and a gasket is arranged between the valve cover and the valve body. In some embodiments, a positioning groove matched with the valve cage is formed in the valve cover, and the upper end of the valve cage is clamped in the positioning groove and forms limit fit of the valve cage and the valve cover. In some embodiments, the valve body is provided with an air inlet and an air outlet respectively, the valve body is internally provided with an air inlet channel communicated between the valve cavity and the air inlet, and the valve body is internally provided with an air outlet channel communicated between the valve cavity and the air outlet. In some embodiments, a plurality of air holes communicated with the exhaust passage are respectively arranged on the peripheral wall of the valve cage. The valve core has the beneficial effects that the valve core adopts a needle-shaped structure design, and the valve core is contacted with the convex ring part of the valve seat through the cambered surface contact part, so that the contact area of the valve core and the valve seat can be effectively reduced, the flow resistance can be effectively reduced, and the sensitivity and the stability of micro flow control are improved. Because the contact area is small, the fl