A needle valve
By designing the fixing bolts and seals, the leakage problem caused by loosening of existing needle valves is solved, resulting in a more reliable valve connection and reduced leakage risk.
Patent Information
- Application Number
- CN202522430625.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-17
AI Technical Summary
Existing needle valves are prone to loosening due to changes in the internal medium and ambient temperature, which can cause the thread tightening force to fail and lead to media leakage.
The valve is connected to a fixed bolt. The first seal is made to fit tightly by pressing the gland and the pressure ring with a nut. A metal spiral wrapping sheet and a second seal are used to provide a reliable seal, preventing leakage caused by loosening.
This improves the reliability of needle valve and valve connection, reduces leakage risk, and increases the safety factor of the valve.
Smart Images
Figure CN224944301U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a needle valve. Background Technology
[0002] The structure of needle valves in the prior art is generally as shown in the attached diagram of the instruction manual. Figure 2 As shown, the needle valve body is directly screwed onto the valve, and the metal spiral wound gasket is pressed by the thread preload to prevent leakage. Although the needle valve with the above structure has the advantage of low cost, the needle valve with the above structure is prone to thread tightening failure and loosening due to changes in the medium inside the valve and the ambient temperature, which in turn causes medium leakage. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a needle valve that is more reliable in connection with valves and less prone to leakage.
[0004] The technical solution of this utility model is: a needle valve, including a needle valve body and a valve stem, wherein a pressure ring is provided above the needle valve body, a pressure cap is provided above the pressure ring, and the needle valve body is fixed to the valve by fixing bolts; It also includes a long bolt, the bolt of which passes upward through the needle valve body and the gland, and a nut is screwed onto the bolt above the gland; The valve stem passes sequentially through the gland, the pressure ring, and the needle valve body to connect with the valve disc located at the valve's passage opening. A first sealing element is also fitted on the valve stem between the pressure ring and the needle valve body.
[0005] Furthermore, the needle valve body is fitted with the valve through a stepped structure, and a metal winding plate and a second sealing element are provided at the connection between the needle valve body and the valve.
[0006] Furthermore, the valve stem consists of an upper valve stem and a lower valve stem.
[0007] Furthermore, a third sealing element is provided at the connection between the fixing bolt and the needle valve body.
[0008] Furthermore, a handle is also fixed to the top of the upper valve stem.
[0009] Furthermore, the handle is fixed to the upper valve stem by an internal hex screw.
[0010] Furthermore, the bottom of the needle valve body is provided with a countersunk hole corresponding to the nut of the long rod bolt, and the nut of the long rod bolt is located in the countersunk hole.
[0011] The beneficial effects of this utility model are as follows: The needle valve in this utility model is connected to the valve by a fixing bolt, which ensures a reliable connection. The nut compresses the gland and pressure ring to ensure the first sealing element is tightly fitted to the sealing surface. Simultaneously, the fixing bolt also compresses the needle valve body, reliably fixing it to the valve. The metal winding strip and the second sealing element reliably seal the connection between the needle valve body and the valve. The bolt connection method is less prone to loosening. Even if some loosening occurs, the first and second sealing elements prevent immediate leakage, significantly reducing the possibility of leakage at the connection between the valve and the needle valve, thus increasing the valve's safety factor. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of a needle valve in the prior art.
[0013] In the diagram: 1. Needle valve body; 2. Pressure ring; 3. Pressure cap; 4. Fixing bolt; 5. Valve; 6. Long rod bolt; 7. Nut; 8. Valve disc; 9. First seal; 10. Metal spiral wound plate; 11. Second seal; 12. Upper valve stem; 13. Lower valve stem; 14. Handle; 15. Hex socket screw. Detailed Implementation
[0014] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0015] like Figure 1 As shown, a needle valve includes a needle valve body 1 and a valve stem. A pressure ring 2 is provided above the needle valve body 1, and a pressure cap 3 is provided above the pressure ring 2. The needle valve body 1 is fixed to a valve 5 by a fixing bolt 4. It also includes a long bolt 6, the screw of which passes upward through the needle valve body 1 and the pressure cap 3, and a nut 7 is screwed onto the screw above the pressure cap 3; The valve stem passes sequentially through the pressure cap 3, pressure ring 2, and needle valve body 1 to connect with the valve disc 8 located at the passage opening of valve 5. A first sealing element 9 is also fitted on the valve stem between the pressure ring 2 and the needle valve body 1.
[0016] In another embodiment, such as Figure 1 As shown, the needle valve body 1 is fitted with the valve 5 through a stepped structure, and a metal winding plate 10 and a second sealing element 11 are also provided at the connection between the needle valve body 1 and the valve 5.
[0017] The needle valve with the above structure is connected to the valve 5 by fixing bolts 4, ensuring a reliable connection. Nut 7 compresses the gland 3 and pressure ring 2 to ensure the first sealing element 9 fits tightly against the sealing surface. Simultaneously, the fixing bolts 4 also compress the needle valve body 1, reliably fixing it to the valve 5. The metal spiral wound plate 10 and the second sealing element 11 reliably seal the connection between the needle valve body 1 and the valve 5. The bolted connection is less prone to loosening, and even if some loosening occurs, the first and second sealing elements 9 and 11 prevent immediate leakage, significantly reducing the possibility of leakage at the connection between the valve 5 and the needle valve, thus increasing the safety factor of the valve 5.
[0018] In another embodiment, such as Figure 1 As shown, the valve stem consists of an upper valve stem 12 and a lower valve stem 13 to facilitate assembly.
[0019] In another embodiment, such as Figure 1 As shown, a third sealing element is also provided at the connection between the fixing bolt 4 and the needle valve body 1.
[0020] In another embodiment, such as Figure 1 As shown, a handle 14 is also fixed to the top of the upper valve stem 12 to facilitate rotating the valve stem.
[0021] In another embodiment, such as Figure 1 As shown, the handle 14 is fixed to the upper valve stem 12 by an internal hex screw 15.
[0022] In another embodiment, such as Figure 1 As shown, the bottom of the needle valve body is also provided with a countersunk hole corresponding to the nut of the long rod bolt 6. The nut of the long rod bolt 6 is located in the countersunk hole to avoid affecting the fit between the needle valve body 1 and the valve 5.
Claims
1. A needle valve, comprising a needle valve body (1) and a valve stem, characterized in that, The needle valve body (1) is provided with a pressure ring (2) above it, and a pressure cap (3) is provided above the pressure ring (2). The needle valve body (1) is fixed to the valve (5) by fixing bolts (4). It also includes a long rod bolt (6), the screw of which passes upward through the needle valve body (1) and the gland (3), and a nut (7) is screwed onto the screw above the gland (3); The valve stem passes through the pressure cap (3), pressure ring (2), and needle valve body (1) in sequence and is connected to the valve disc (8) located at the passage opening of the valve (5). A first sealing element (9) is also fitted on the valve stem between the pressure ring (2) and the needle valve body (1).
2. A needle valve as described in claim 1, characterized in that, The needle valve body (1) is fitted with the valve (5) through a stepped structure. The connection between the needle valve body (1) and the valve (5) is also provided with a metal winding plate (10) and a second sealing element (11).
3. A needle valve as described in claim 2, characterized in that, The valve stem consists of an upper valve stem (12) and a lower valve stem (13).
4. A needle valve as described in claim 3, characterized in that, A third sealing element is also provided at the connection between the fixing bolt (4) and the needle valve body (1).
5. A needle valve as described in claim 4, characterized in that, A handle (14) is also fixed to the top of the upper valve stem (12).
6. A needle valve as described in claim 5, characterized in that, The handle (14) is fixed to the upper valve stem (12) by an internal hex screw (15).
7. A needle valve as described in claim 6, characterized in that, The bottom of the needle valve body is also provided with a countersunk hole corresponding to the nut of the long rod bolt (6), and the nut of the long rod bolt (6) is located in the countersunk hole.