High-precision leakage-free plunger regulating valve

Abstract

A high-precision non-leakage plunger regulating valve, including valve body, the valve body inside installs valve core, elastic valve sleeve, disc spring group, sealing pressure cap, the valve body bottom is connected with water inlet flange body, the valve body one side is equipped with water outlet flane body;Through clockwise rotation hand wheel makes valve core move down, when valve core adjusting section inserts valve core gley circle, will cut off water inlet, realizes high pressure full seal, elastic valve sleeve is close to valve core, eliminates leak interval, realizes non-leakage regulation;The present application has the advantages of good sealing performance, simple operation, good reliability, high safety and high adjustment precision.

Description

Technical Field

[0001] This invention relates to the field of regulating valves and fluid pipeline flow regulation technology, specifically to a high-precision, leak-free plunger regulating valve. Background Technology

[0002] In various ground pipelines, regulating valves are often used to adjust the flow and pressure of the pipeline. Currently, the commonly used valve types are mainly sleeve valves and grinding wheel regulating valves, but they all have some problems in actual use.

[0003] The grinding wheel regulating valve mainly relies on the tight fit between two valve plates for sealing, which is a hard seal type with a large preload. Due to the lack of a pressure balancing structure, the regulating torque is large under high pressure differentials; because it uses a metal hard seal, it requires high precision in machining and installation, and the valve plates wear significantly over long-term use; at the same time, since the valve core rotation angle from fully open to fully closed is generally no more than 90°, the regulating accuracy of this structure is poor at small flow rates.

[0004] The sleeve regulating valve is mainly composed of a valve core and a sleeve. The valve core is moved up and down to change the exposed area of ​​the opening on the sleeve, thereby achieving regulation. This structure has a small regulating torque and high precision. However, due to the unavoidable fit gap between the valve core and the sleeve, even if the valve core completely covers the opening, there will still be a fixed amount of leakage, and the amount of leakage will increase as the valve diameter increases.

[0005] Patent CN202222657720.8 discloses a flow and pressure regulating valve, including a valve seat with an upper valve chamber and a lower valve chamber inside, and a medium inlet and a medium outlet respectively communicating with the upper and lower valve chambers on its outer side; a valve cylinder with a valve core chamber inside, located in the upper valve chamber, and having a medium through hole communicating with the medium inlet; a valve core located in the valve core chamber, having a valve stem chamber communicating with the valve core chamber inside, and a flow regulating groove communicating with the lower valve chamber at the lower end of the valve stem chamber; a valve stem located in the valve stem chamber, rotatably connected to the valve cover by a valve stem nut, and its upper end connected to the valve seat by the valve cover; a tapered tip at the lower end of the valve stem, which moves up and down in the flow regulating groove as the valve stem rotates; and an orifice plate located in the lower valve chamber, having several through holes. However, due to the gap between the valve core and the valve cylinder, liquid leakage is unavoidable during adjustment, and high-precision adjustment of small flow rates cannot be achieved. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention aims to provide a high-precision, leak-free plunger regulating valve. By setting an adjustable gap elimination element around the valve core inside the valve body, the gap between the valve core and the valve body is eliminated, reducing water flow leakage. The valve core is controlled by a handwheel for high-precision adjustment. At the same time, a pressure balancing structure is also set inside the valve body to minimize the torque during switching and adjustment. The present invention has the advantages of good sealing performance, simple operation, high reliability, high safety, and high adjustment accuracy.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A high-precision, leak-free plunger regulating valve includes a valve body 104, a valve core 218 inside the valve body 104, the lower end of the valve body 104 being connected to the upper end of an inlet flange 106, an outlet flange 105 on the side surface of the valve body 104, a sealing cap 103 installed at the upper end of the valve body 104, the valve core 218 including a valve core adjusting section 401, a pressure guiding hole 217 at the center of the valve core adjusting section 401, a transmission thread section 402 above the valve core adjusting section 401, a valve core sealing section 403 above the transmission thread section 402, a handwheel square 404 above the valve core sealing section 403, and a handwheel 101 fixed on the handwheel square 404.

[0009] The valve core 218 is fitted with an elastic valve sleeve 208 on its outer side. A support pad 207 that matches the shape of the upper conical mating surface 211 of the elastic valve sleeve 208 is provided above it. The lower conical mating surface 212 of the elastic valve sleeve 208 matches the conical surface shape machined inside the valve body 104. A valve core large sealing ring 202 is fitted on the upper outer side of the valve core 218. Multiple disc spring assemblies 206 are provided between the valve core large sealing ring 202 and the support pad 207. A valve core glyph 203 is fitted on the lower outer side of the valve core 218.

[0010] The elastic valve sleeve 208 has a valve sleeve adjustment port 213 with a slender triangular shape on one side, and a slit 301 is provided at the center line of the valve sleeve adjustment port 213. The elastic valve sleeve 208 has an anti-rotation groove 302 on the other side.

[0011] An anti-rotation pin 209 is installed on one side inside the valve body 104. One end of the anti-rotation pin 209 passes through the anti-rotation groove 302, and a pin sealing ring 210 is fitted on the anti-rotation pin 209.

[0012] The upper end of the water inlet flange body 106 is provided with a water inlet flange body sealing ring 205.

[0013] The lower end of the sealing cap 103 is provided with a cap sealing ring 204.

[0014] The width of the slit 301 does not exceed 0.2 mm.

[0015] The handwheel square 404 has a nut thread 405 on its upper part that matches the nut 102.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By setting the sealing cap 103, the cap sealing ring 204, the valve core large sealing ring 202, the valve core Glyd ring 203, and the inlet flange sealing ring 205, all connection points are sealed when the valve is closed, thus achieving complete high-pressure sealing of the valve.

[0018] 2. The valve core 218 can be adjusted by using the handwheel 101, which is easy to operate.

[0019] 3. By setting the anti-rotation slot 302 and the anti-rotation pin 209, the elastic valve sleeve 208 will not rotate during adjustment, thereby improving the sealing performance and the reliability of the invention.

[0020] 4. By setting the pressure guide hole 217, the pressure on the upper and lower sides of the valve core 401 is balanced and connected, reducing the adjustment torque and improving the safety of the present invention.

[0021] 5. By compressing the elastic valve sleeve 208, the elastic valve sleeve 208 is tightened inward under the force of the upper conical mating surface 211 and the lower conical mating surface 212, eliminating the annular gap between it and the valve core 218, eliminating the amount of leakage during regulation, and further improving the sealing performance.

[0022] 6. By rotating the sealing cap 103, the preload of the spring assembly 206 can be changed, thereby adjusting the tightness of the elastic valve sleeve 208 to prevent the valve core 218 from seizing. At the same time, the amount of retraction can be manually increased when parts are worn to prevent increased leakage and improve the safety of the invention.

[0023] 7. Because the valve sleeve adjustment port 213 is shaped as a slender inverted triangle, the area of ​​the beginning end changes little and the area of ​​the end end changes much under the same stroke, thereby achieving high-precision adjustment of small flow and large flow in proportion.

[0024] 8. By appropriately loosening the sealing cap 103, the preload of the disc spring assembly 206 is appropriately reduced, thereby preventing the valve core 218 from being seized by the elastic valve sleeve 208 due to excessive friction, thus improving the reliability of the present invention.

[0025] In summary, the present invention has the advantages of good sealing performance, simple operation, high reliability, high safety and high adjustment accuracy. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0028] Figure 3 for Figure 2 Enlarged diagram of point A.

[0029] Figure 4 This is a schematic diagram of the valve core structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the elastic valve sleeve of the present invention, wherein, Figure 5 -a is a schematic diagram of the elastic valve sleeve from the perspective of the cut. Figure 5 -b is a schematic diagram of the elastic valve sleeve from the perspective of the anti-rotation slot.

[0031] In the diagram, 101 is the handwheel, 102 is the nut, 103 is the sealing cap, 104 is the valve body, 105 is the outlet flange body, 106 is the inlet flange body, 201 is the small sealing ring of the valve core, 202 is the large sealing ring of the valve core, 204 is the cap sealing ring, 205 is the inlet flange body sealing ring, 206 is the disc spring assembly, 207 is the support pad, 208 is the elastic valve sleeve, 209 is the anti-rotation pin, 210 is the pin sealing ring, 211 is the upper conical mating surface, 212 is the lower conical mating surface, 213 is the valve sleeve adjustment port, 214 is the flange outlet, 215 is the flange inlet, 216 is the pressure balancing chamber, 217 is the pressure guide hole, 218 is the valve core, 301 is the slit, and 302 is the anti-rotation groove. Detailed Implementation

[0032] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2As shown, a high-precision, leak-free plunger regulating valve includes a valve body 104. A valve core 218 is disposed inside the valve body 104. The lower end of the valve body 104 is connected to the upper end of an inlet flange 106. An outlet flange 105 is disposed on the side surface of the valve body 104. A sealing cap 103 is installed on the upper end of the valve body 104. The valve core 218 includes a valve core adjusting section 401, and a pressure guiding hole 217 is disposed at the center of the valve core adjusting section 401. The pressure guide hole 217 enables the pressure balance and conduction on both sides of the valve core 401, reducing the adjustment torque and improving the safety of the invention. The valve core adjustment section 401 is provided with a transmission thread section 402 above it, the valve core sealing section 403 is provided above it, and a handwheel square 404 is provided above it. A handwheel 101 is fixed on the handwheel square 404. The valve core 218 is adjusted by using the handwheel 101, which makes the operation simple.

[0034] The valve core 218 is fitted with an elastic valve sleeve 208. A support pad 207, matching the shape of the upper conical mating surface 211 of the elastic valve sleeve 208, is provided above it. The lower conical mating surface 212 of the elastic valve sleeve 208 matches the conical surface shape machined inside the valve body 104. A large valve core sealing ring 202 is fitted on the upper outer side of the valve core 218. Multiple disc spring assemblies 206 are provided between the large valve core sealing ring 202 and the support pad 207. By rotating the sealing cap 103, the preload of the spring assemblies 206 can be changed, thereby affecting the elastic valve sleeve 208. The tightness of the valve core 218 is adjusted to prevent it from seizing. At the same time, the amount of retraction can be manually increased when the parts are worn to prevent increased leakage, further improving the safety of the invention. The lower outer side of the valve core 218 is fitted with a valve core glyph 203. By setting multiple sealing rings, the valve can completely seal against high pressure when it is closed. The preload of the disc spring assembly 206 and the action of the upper conical mating surface 211 and the lower conical mating surface 212 ensure that the elastic valve sleeve 208 is always tightly fitted against the valve core adjustment section 401, eliminating gaps and achieving zero leakage.

[0035] like Figure 3 As shown, one side of the elastic valve sleeve 208 has a valve sleeve adjustment port 213 in the shape of a slender triangle. Since the valve sleeve adjustment port 213 is in the shape of a slender inverted triangle, the area of ​​the beginning end changes little and the area of ​​the end end changes much under the same stroke, thereby realizing the proportional precision adjustment of small flow and large flow. At the same time, a slit 301 is provided at the center line of the valve sleeve adjustment port 213, and the other side of the elastic valve sleeve 208 has an anti-rotation groove 302.

[0036] An anti-rotation pin 209 is installed on one side inside the valve body 104. One end of the anti-rotation pin 209 passes through the anti-rotation groove 302. By setting the anti-rotation groove 302 and the anti-rotation pin 209, it is ensured that the elastic valve sleeve 208 will not rotate during adjustment, thereby improving the sealing performance and the reliability of the present invention. A pin sealing ring 210 is fitted on the anti-rotation pin 209.

[0037] The upper end of the water inlet flange body 106 is provided with a water inlet flange body sealing ring 205, which further improves the sealing performance of the present invention.

[0038] The lower end of the sealing cap 103 is provided with a cap sealing ring 204.

[0039] The width of the slit 301 does not exceed 0.2 mm.

[0040] The handwheel square 404 has a nut thread 405 on its upper part that matches the nut 102.

[0041] The working principle of this invention is:

[0042] The present invention is installed in a pipeline that requires flow or pressure regulation. The inlet flange 106 is connected to the inlet pipeline, and the outlet flange 105 is connected to the outlet pipeline.

[0043] When it is necessary to completely shut off the water supply, turn the handwheel 101 clockwise to move the valve core 218 downward. When the lower end of the valve core adjusting section 401 on the valve core 218 is inserted into the valve core Glyd ring 203, the valve core 218 is completely sealed. At this time, the water supply is completely cut off. Depending on the pressure rating of the mounting flange, the sealing differential pressure of the valve core 218 at this time can reach a maximum of 60MPa.

[0044] When the valve needs to be fully opened, rotate the handwheel 101 counterclockwise to move the valve core 218 upward. At this time, the pressure guide hole 217 connects the pressures of the upper and lower seals of the valve core 218, allowing the valve core 218 to be adjusted up and down with almost no influence from the pressure difference between the incoming and outgoing water. The adjustment torque is very small. When the lower end of the valve core adjustment section 401 moves up to the large end plane position of the valve sleeve adjustment port 213, the valve is fully open.

[0045] When flow regulation is required, start by rotating the handwheel from the fully closed position to move the valve core 218 upwards. When the lower end of the valve core 218 disengages from the valve core glyph 203, the high-pressure seal fails. At this point, due to the preload of the elastic valve sleeve 208 under the action of the disc spring assembly 207, it retracts inwards and tightly adheres to the outer surface of the valve core adjusting section 401, making the entire adjustable part almost leak-free. Leak-free operation can still be achieved at this stage. Continue rotating the handwheel 101 to move the valve core 218 upwards until the bottom of the valve core 218... The valve sleeve adjustment port 213 is opened at the beginning, and the fluid flows out from the opening. The valve core 218 moves up and down to change the flow area of ​​the valve sleeve adjustment port 213, thereby adjusting the flow rate. The transmission thread section 402 of the valve core 218 uses a small pitch thread to achieve a small up and down movement of the valve core 218. At the same time, the valve sleeve adjustment port 213 is shaped as a slender inverted triangle, which allows for a small change in the area at the beginning and a large change at the end under the same stroke, thereby achieving proportional precision adjustment between small and large flow rates.

[0046] When it is found that the valve core 218 is seized by the elastic valve sleeve 208 due to excessive friction, the sealing cap 103 should be loosened appropriately to reduce the preload of the disc spring assembly 206. When it is found that there is flow leakage between the elastic valve sleeve 208 and the valve core 218, the sealing cap 103 should be tightened appropriately to increase the preload of the disc spring assembly 206, so that the elastic valve sleeve 208 and the valve core 218 fit more tightly and prevent fluid leakage.

Claims

1. A high-precision, leak-free plunger regulating valve, comprising a valve body (104), wherein a valve core (218) is provided inside the valve body (104), the lower end of the valve body (104) is connected to the upper end of an inlet flange (106), an outlet flange (105) is provided on the side surface of the valve body (104), and a sealing cap (103) is installed on the upper end of the valve body (104), characterized in that, The valve core (218) includes a valve core adjusting section (401), a pressure guiding hole (217) is provided at the center of the valve core adjusting section (401), a transmission thread section (402) is provided above the valve core adjusting section (401), a valve core sealing section (403) is provided above the transmission thread section (402), a handwheel square (404) is provided above the valve core sealing section (403), and a handwheel (101) is fixed on the handwheel square (404). The valve core (218) is fitted with an elastic valve sleeve (208) on its outer side. A support pad (207) matching the shape of the upper conical mating surface (211) of the elastic valve sleeve (208) is provided above it. The lower conical mating surface (212) of the elastic valve sleeve (208) matches the conical surface shape machined inside the valve body (104). A valve core large sealing ring (202) is fitted on the upper outer side of the valve core (218). Multiple disc spring assemblies (206) are provided between the valve core large sealing ring (202) and the support pad (207). A valve core glyph (203) is fitted on the lower outer side of the valve core (218). The elastic valve sleeve (208) has a valve sleeve adjustment port (213) in the shape of a slender triangle on one side. When flow regulation is required, start by rotating the handwheel from the fully closed position to move the valve core (218) upward. When the lower end of the valve core (218) comes off the valve core glyph (203), the high pressure seal fails. At this time, the elastic valve sleeve (208) shrinks inward under the pre-pressure of the disc spring assembly (206) and closely adheres to the outer surface of the valve core adjustment section (401).

2. The high-precision, leak-free plunger regulating valve according to claim 1, characterized in that, A slit (301) is provided at the center line of the valve sleeve adjustment port (213), and an anti-rotation groove (302) is provided on the other side of the elastic valve sleeve (208).

3. A high-precision, leak-free plunger regulating valve according to claim 1 or 2, characterized in that, An anti-rotation pin (209) is installed on one side inside the valve body (104). One end of the anti-rotation pin (209) passes through the anti-rotation groove (302), and a pin sealing ring (210) is fitted on the anti-rotation pin (209).

4. The high-precision, leak-free plunger regulating valve according to claim 1, characterized in that, The upper end of the inlet flange body (106) is provided with an inlet flange body sealing ring (205).

5. A high-precision, leak-free plunger regulating valve according to claim 1, characterized in that, The lower end of the sealing cap (103) is provided with a cap sealing ring (204).

6. A high-precision, leak-free plunger regulating valve according to claim 2, characterized in that, The width of the cut (301) shall not exceed 0.2 mm.

7. A high-precision, leak-free plunger regulating valve according to claim 1, characterized in that, The handwheel square (404) is provided with a nut thread (405) that matches the nut (102) on its upper part.

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