High pressure pressure regulating valve with stable output pressure

Abstract

The present application relates to pressure regulating valve technical field, disclose a kind of high-pressure pressure regulating valve of stable output pressure.The present application includes: valve body and the electric actuator of being arranged at the top of valve body, the valve seat, valve stem, sealing sleeve and intermediate strut are arranged in the valve body, the first seal, second seal and third seal are respectively arranged on the sealing sleeve, pressure balance cavity is arranged between the first seal and second seal, the pressure balance hole of pressure balance cavity is arranged in the bottom of valve stem, so that when the lower end of valve stem is pressed, pressure medium will enter pressure balance cavity through pressure balance hole and form pressure balance, shunt cavity is arranged between the second seal and third seal, drainage hole is arranged on the sealing sleeve, which is connected with pressure balance cavity and shunt cavity.The present application improves the anti-seepage capacity by improving the anti-seepage structure, so as to reduce the influence of medium leakage on the stability of pressure regulating valve.

Description

Technical Field

[0001] This invention relates to the field of pressure regulating valve technology, and in particular to a high-pressure pressure regulating valve that stabilizes output pressure. Background Technology

[0002] A pressure regulating valve is a device commonly used to control the pressure of gas or liquid. It controls the flow rate by changing the cross-sectional area of ​​the medium, thereby achieving pressure control. Pressure regulating valves generally include mechanical, electric, and pneumatic types. Taking a common mechanical pressure regulating valve as an example, it mainly consists of a valve body, valve stem, valve core, spring, and adjusting device. The valve body is the main part of the pressure regulating valve, containing channels and chambers for liquid flow and pressure regulation. The valve core is the key adjusting component; it moves up and down under the action of the spring, thereby changing the valve's flow area and pressure. The spring's main function is to provide a restoring force, ensuring the valve core returns to its initial position after adjustment. The adjusting device operates the valve core to regulate flow and stabilize pressure.

[0003] The valve body and valve stem are equipped with a sealing structure to prevent leakage in the pressure regulating valve. If leakage occurs, it will affect the overall stability. Most existing pressure regulating valves have a single sealing ring, which is generally only suitable for conventional media transportation and pressure regulation. Under high pressure, the probability of leakage will increase. Therefore, it is necessary to propose a high-pressure pressure regulating valve with stable output pressure. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a high-pressure regulating valve with stable output pressure.

[0005] This invention is achieved using the following technical solution: a valve body and an electric actuator disposed on the top of the valve body. The valve body is provided with a valve seat, a valve stem, a sealing sleeve, and an intermediate support. The sealing sleeve is respectively provided with a first seal, a second seal, and a third seal. A pressure balance chamber is provided between the first seal and the second seal. The bottom end of the valve stem is provided with a pressure balance hole that connects to the pressure balance chamber. This allows the pressure medium to enter the pressure balance chamber through the pressure balance hole when the lower end of the valve stem is pressurized, thus forming a pressure balance. A flow divider chamber is provided between the second seal and the third seal. The sealing sleeve is provided with a drainage hole that connects the pressure balance chamber and the flow divider chamber, which can guide a small amount of leaked medium after the failure of the first seal and the second seal to the pressure balance chamber.

[0006] As a further improvement to the above solution, the first seal consists of two Glyd rings, the second seal consists of a Glyd ring and a U-ring, and the third seal is a single packing ring.

[0007] As a further improvement to the above solution, the packing ring is composed of multiple overlapping V-rings, and the multiple V-rings are connected vertically.

[0008] As a further improvement to the above solution, the valve stem consists of two parts: a top stem body and a bottom valve core. The contact position between the top of the valve seat and the valve core is funnel-shaped, and the bottom end of the valve core is a cone shape that fits the valve seat, thereby increasing the contact area between the two.

[0009] As a further improvement to the above solution, a first spring is provided inside the valve seat, and the top of the first spring abuts against the valve core at the bottom of the valve stem.

[0010] As a further improvement to the above solution, a groove is provided at the connection between the drainage hole and the pressure balance chamber, and a one-way valve plate is provided in the groove, so that the medium that seeps into the diversion chamber can normally enter the pressure balance chamber through the drainage hole, while the medium in the pressure balance chamber will not flow back into the drainage hole.

[0011] As a further improvement to the above solution, a buffer tube is provided inside the pressure balance hole, and a flow-blocking block is provided inside the buffer tube, so as to reduce the pressure applied by the medium to the pressure balance chamber.

[0012] As a further improvement to the above solution, a plug is provided inside the valve seat, and the bottom end of the buffer tube is in contact with the plug. When the valve stem completely closes the inlet on the valve seat, the plug can prevent the medium from continuing to enter the pressure balance chamber.

[0013] As a further improvement to the above solution, the blockage is a telescopic reset structure, which consists of a sleeve, a plug cap telescopically installed in the sleeve, and a second spring, so that when the valve stem rises and squeezes the medium in the pressure balance chamber, the medium can smoothly push open the blockage and be discharged.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] By setting a pressure balancing chamber and a pressure balancing hole between the first seal and the second seal, the pressure balancing chamber can improve the anti-permeability effect of the first seal. This design allows the medium to be introduced into the pressure balancing chamber to offset the permeation pressure originally applied to the first seal, thereby reducing the permeability of the medium to the first seal and improving the anti-permeability effect of the first seal. For example, if the pressure of the medium in the intermediate support permeating the first seal is 10 Pa, and the pressure applied to the second seal after the first seal collapses is 8 Pa, after introducing part of the medium into the pressure balancing chamber through the pressure balancing hole, the permeation pressure of the medium in the pressure balancing chamber on the first seal and the second seal is 3 Pa respectively. Therefore, under the current condition, the permeation force of the medium on the first seal is reduced from 10 Pa to 7 Pa, which is less than the original permeation pressure of the medium on the first seal, while the permeation pressure of the medium in the pressure balancing chamber is small and will not affect the second seal.

[0016] Furthermore, the pressure medium acts on the valve stem step section at the lower end of the pressure balance chamber, and is basically balanced with the pressure at the lower end of the valve stem. This makes the valve stem almost unaffected by pressure when it moves up and down for adjustment. At the same time, the pressure balance chamber can also reduce the starting torque of the valve stem.

[0017] By setting a flow divider between the second and third seals and a drainage hole between the flow divider and the pressure balance chamber, a fourth seal can be formed to intercept the second and third seals. Even if the first and second seals permeate, causing a small amount of medium to diffuse into the third seal, the permeated medium will first enter the flow divider and then enter the pressure balance chamber through the drainage hole.

[0018] By installing a one-way valve between the drainage hole and the pressure balance chamber, the medium in the pressure balance chamber cannot reverse through the drainage hole to the diversion chamber, while the medium in the diversion chamber can enter the pressure balance chamber normally. As the valve stem is adjusted by raising and lowering, when the valve stem rises, its stepped part will squeeze the medium in the pressure balance chamber, causing the medium to be discharged through the pressure balance hole. When it falls, the negative pressure formed will guide the one-way valve to open, allowing the medium in the drainage hole to smoothly enter the pressure balance chamber.

[0019] By installing a buffer tube inside the valve seat, the excessive pressure exerted by the medium on the pressure balance chamber can be avoided, which would have a counterproductive effect. When the valve stem blocks the inlet on the valve seat, the originally dispersed medium pressure is concentrated at the bottom of the valve core on the valve stem. The pressure balance hole and the pressure balance chamber, as venting holes, are subjected to even greater pressure. To prevent the medium from using the pressure balance chamber as a seepage point, a plug needs to be installed inside the valve seat to seal the buffer tube when the valve core is closed. Attached Figure Description

[0020] Figure 1A schematic diagram illustrating the overall structure of the high-pressure regulating valve for stabilizing output pressure according to the present invention;

[0021] Figure 2 A cross-sectional view of the high-pressure regulating valve for stabilizing output pressure according to the present invention;

[0022] Figure 3 A front plan sectional view of the high-pressure regulating valve for stabilizing output pressure according to the present invention;

[0023] Figure 4 This is a disassembled planar cross-sectional view of the high-pressure regulating valve for stabilizing output pressure according to the present invention.

[0024] Figure 5 A cross-sectional plan view of the internal structure of the high-pressure regulating valve for stabilizing output pressure according to the present invention.

[0025] Figure 6 A diagram illustrating the valve seat, buffer tube, and blockage;

[0026] Figure 7 A cross-sectional view of the buffer tube and the blockage;

[0027] Figure 8 This is a cross-sectional view of the third sealing packing ring.

[0028] Explanation of key symbols:

[0029] 1. Valve body; 2. Threaded gland; 3. Actuator connecting plate; 4. Valve cover; 5. Valve stem; 6. Valve seat; 7. Sealing sleeve; 8. Intermediate support; 9. First seal; 10. Second seal; 11. Third seal; 12. Packing gland; 13. Pressure balance chamber; 14. Pressure balance hole; 15. Diverting chamber; 16. Drain hole; 17. One-way valve plate; 18. First spring; 19. Buffer tube; 20. Plug; 21. Electric actuator. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] Please combine Figures 1 to 8A high-pressure regulating valve for stable output pressure includes: a valve body consisting of a valve housing 1, a threaded cover 2 on the valve housing 1, an actuator connecting plate 3 on the threaded cover 2, a valve cover 4 inside the valve housing 1, an inlet flange at the bottom of the valve housing 1, and an outlet flange on one side of the valve housing 1. An electric actuator 21 is mounted on the actuator connecting plate 3. A valve seat 6 is located inside the valve body. A sealing ring is located at the bottom of the valve seat 6. An intermediate support 8 is located at the top of the valve seat 6. The intermediate support 8 has a through hole and a sealing sleeve 7 is located on the intermediate support 8. Two sealing rings are fitted on the sealing sleeve 7. A valve stem 5 is located inside the sealing sleeve 7. The top of the valve stem 5 is connected to the control rod of the electric actuator 21. The valve stem 5 is threadedly connected to the threaded cover 2. When the valve stem 5 rotates, it can rise and fall under the action of the thread. A first seal 9 and a second seal 9 are respectively provided on the sealing sleeve 7. The first seal 9 consists of two Glyd rings, the second seal 10 consists of a Glyd ring and a U-ring, and the third seal 11 is a single packing ring. A packing gland 12 is provided on the sealing sleeve 7 to tighten and limit the third seal 11. A pressure balancing chamber 13 is provided between the first seal 9 and the second seal 10. A pressure balancing hole 14 is provided at the bottom end of the valve stem 5 to connect with the pressure balancing chamber 13, so that when the lower end of the valve stem 5 is pressurized, the pressure medium will enter the pressure balancing chamber 13 through the pressure balancing hole 14 to form a pressure balance. A flow divider 15 is provided between the second seal 10 and the third seal 11. A drainage hole 16 is provided on the sealing sleeve 7 to connect the pressure balancing chamber 13 and the flow divider 15, which can guide a small amount of leaked medium after the failure of the first seal 9 and the second seal 10 to the pressure balancing chamber 13.

[0032] Through the above technical solution, by setting a pressure balancing chamber 13 and a pressure balancing hole 14 between the first seal 9 and the second seal 10, the pressure balancing chamber 13 can improve the anti-permeability effect of the first seal 9. This design allows the medium to be introduced into the pressure balancing chamber 13 to offset the permeation pressure originally applied to the first seal 9, thereby reducing the permeability of the medium to the first seal 9 and improving the anti-permeability effect of the first seal 9. Furthermore, the pressure medium acts on the stepped cross-section of the valve stem 5 at the lower end of the pressure balancing chamber 13, and is basically balanced with the pressure at the lower end of the valve stem 5, so that when the valve stem 5 moves up and down for adjustment... Almost unaffected by pressure, and at the same time, under the action of the pressure balance chamber 13, the starting torque of the valve stem 5 can be reduced. By setting a flow divider chamber 15 between the second seal 10 and the third seal 11, and setting a drainage hole 16 between the flow divider chamber 15 and the pressure balance chamber 13, a fourth seal can be formed to intercept between the second seal 10 and the third seal 11. Even if the first seal 9 and the second seal 10 permeate, causing a small amount of medium to diffuse into the third seal 11, the permeated medium will first enter the flow divider chamber 15, and then enter the pressure balance chamber 13 through the drainage hole 16.

[0033] Please combine Figure 8 The packing ring is composed of multiple overlapping V-rings connected vertically.

[0034] Through the above technical solution, this structure causes the V-ring to expand when the medium permeates from bottom to top, thereby further increasing the contact between the V-ring and the valve stem 5 and the sealing sleeve 7, and further improving the anti-permeability effect. Furthermore, when the medium between the two V-rings permeates and pressurizes, the upper V-ring will expand to increase the anti-permeability effect, while the lower V-ring will be forced to contract, thereby allowing the medium to flow back and ensuring a good anti-permeability effect.

[0035] Please combine Figure 5 The valve stem 5 consists of two parts: a top stem and a bottom valve core. The top of the valve seat 6 contacts the valve core in a funnel shape, and the bottom of the valve core is a cone shape that fits the valve seat 6.

[0036] The above technical solution increases the contact area between the two, ensuring their sealing performance. At the same time, due to the large adjustment pressure, the friction between the valve seat 6 and the valve core is large, and the wear problem cannot be ignored. A layer of wear-resistant alloy is welded at the joint between the valve seat 6 and the valve core, making the valve seat 6 and the valve core run more smoothly and increasing their service life by more than twice that of conventional valve seat 6 and valve core.

[0037] Please combine Figure 5 A first spring 18 is provided inside the valve seat 6, and the top of the first spring 18 abuts against the valve core at the bottom of the valve stem 5.

[0038] Through the above technical solution, since the upper end of the valve stem 5 is connected to the threaded cover 2 by a threaded connection, and the internal thread is connected to the external thread, the size of the gap directly affects the accuracy and stability of this pressure regulating valve. In order to reduce the thread gap, a first spring 18 is set between the valve seat 6 and the valve stem 5. The reaction force of the first spring 18 eliminates the thread gap, stabilizes the position of the valve stem 5, and ensures the stability of the outlet pressure.

[0039] Please combine Figure 5 A groove is provided at the connection between the drainage hole 16 and the pressure balance chamber 13, and a one-way valve plate 17 is provided in the groove. This allows the medium that seeps into the diversion chamber 15 to enter the pressure balance chamber 13 normally through the drainage hole 16, while the medium in the pressure balance chamber 13 will not flow back into the drainage hole 16.

[0040] Please combine Figures 5 to 7A buffer tube 19 is installed inside the pressure balance hole 14, and a flow-blocking block is installed inside the buffer tube 19 to reduce the pressure applied by the medium to the pressure balance chamber 13. A plug 20 is installed inside the valve seat 6, and the bottom end of the buffer tube 19 is in contact with the plug 20. When the valve stem 5 completely closes the inlet on the valve seat 6, the plug 20 can prevent the medium from continuing to enter the pressure balance chamber 13. The plug 20 is a telescopic reset structure, which consists of a sleeve, a plug cap telescopically installed inside the sleeve, and a second spring. This allows the medium to smoothly push open the plug 20 and be discharged when the valve stem 5 rises and squeezes the medium in the pressure balance chamber 13, thus preventing the medium in the pressure balance chamber 13 from being unable to be discharged smoothly and causing damage or seepage to the first seal 9 and the second seal 10.

[0041] Through the above technical solution, the buffer tube 19 is set in the valve seat 6 to avoid the medium from applying too much pressure to the pressure balance chamber 13 and having a counterproductive effect. When the valve stem 5 blocks the inlet on the valve seat 6, the originally dispersed medium pressure is concentrated at the bottom of the valve core of the valve stem 5. The pressure balance hole 14 and the pressure balance chamber 13, as venting holes, are subjected to greater pressure. In order to prevent the medium from using the pressure balance chamber 13 as a seepage point, a plug 20 needs to be set in the valve seat 6 to seal the buffer tube 19 when the valve core is closed.

[0042] The implementation principle of a high-pressure regulating valve with stable output pressure in this application embodiment is as follows:

[0043] A pressure transmitter is installed at the outlet of the pressure regulating valve, which can transmit the pressure value to the central control system. When the pressure is higher or lower than the set pressure, the central control system transmits the signal to the electric actuator 21. The electric actuator 21 performs forward or reverse rotation according to the electrical signal. The electric actuator 21 drives the valve stem 5 to rotate forward or reverse, thereby realizing the rotation and rise of the valve core, thereby realizing the opening between the valve core and the valve seat 6. After the medium enters the intermediate support 8 through the inlet on the valve seat 6, it enters the flow cavity between the intermediate support 8 and the valve body 1 through the through hole on the intermediate support 8, and finally exits through the discharge flange.

[0044] When the pressure regulating valve is in the open state, the valve core on the valve stem 5 separates from the valve seat 6, and the buffer tube 19 is also blocked 20 and in a separated state. At this time, some medium will enter the pressure balance chamber 13 through the buffer tube 19 and the pressure balance hole 14. By keeping the pressure balance chamber 13 pressurized, the medium in the pressure balance chamber 13 applies pressure to the first seal 9 and the second seal 10, thereby offsetting the pressure from below to a certain extent (for example, if the pressure of the medium in the intermediate support 8 penetrating the first seal 9 is 10 Pa, the pressure applied to the second seal 10 after the first seal 9 collapses is 8 Pa, and some medium is introduced into the pressure balance through the pressure balance hole 14). After entering the pressure balance chamber 13, the medium in the pressure balance chamber 13 has a permeation pressure of 3 Pa on the first seal 9 and the second seal 10. Therefore, under the current conditions, the permeation force of the medium on the first seal 9 is reduced from 10 Pa to 7 Pa, which is less than the original permeation pressure of the medium on the first seal 9. The permeation pressure of the medium in the pressure balance chamber 13 is small and will not affect the second seal 10. Furthermore, the pressure medium will act on the stepped section of the valve stem 5 at the lower end of the pressure balance chamber 13, and is basically balanced with the pressure at the lower end of the valve stem 5. This makes the valve stem 5 almost unaffected by pressure when it moves up and down for adjustment. At the same time, under the action of the pressure balance chamber 13, the starting torque of the valve stem 5 can also be reduced.

[0045] At the same time, even if the first seal 9 and the second seal 10 permeate, causing a small amount of medium to diffuse into the third seal 11, the permeated medium will first enter the diversion chamber 15 and then enter the pressure balance chamber 13 through the drainage hole 16. Due to the action of the one-way valve plate 17, the medium in the pressure balance chamber 13 cannot be reversed to the diversion chamber 15 through the drainage hole 16.

[0046] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A high-pressure regulating valve for stable output pressure, comprising a valve body and an electric actuator (21) disposed on the top of the valve body, wherein the valve body is provided with a valve seat (6), a valve stem (5), a sealing sleeve (7), and an intermediate support (8), characterized in that: The sealing sleeve (7) is provided with a first seal (9), a second seal (10) and a third seal (11). A pressure balance chamber (13) is provided between the first seal (9) and the second seal (10). A pressure balance hole (14) communicating with the pressure balance chamber (13) is provided at the bottom end of the valve stem (5). This allows the pressure medium to enter the pressure balance chamber (13) through the pressure balance hole (14) when the lower end of the valve stem (5) is pressurized, thus forming a pressure balance. A flow divider (15) is provided between the second seal (10) and the third seal (11). The sealing sleeve (7) is provided with a drainage hole (16) that connects the pressure balance chamber (13) and the flow divider (15), which can guide a small amount of leaked medium after the failure of the first seal (9) and the second seal (10) into the pressure balance chamber (13). A groove is provided at the connection between the drainage hole (16) and the pressure balance chamber (13), and a one-way valve plate (17) is provided in the groove, so that the medium that seeps into the diversion chamber (15) can normally enter the pressure balance chamber (13) through the drainage hole (16), and the medium in the pressure balance chamber (13) will not flow back into the drainage hole (16).

2. The high-pressure regulating valve with stable output pressure as described in claim 1, characterized in that, The first seal (9) consists of two Glyd rings, the second seal (10) consists of a Glyd ring and a U-ring, and the third seal (11) is a single packing ring.

3. The high-pressure regulating valve with stable output pressure as described in claim 2, characterized in that, The packing ring is composed of multiple overlapping V-shaped rings connected vertically.

4. The high-pressure regulating valve with stable output pressure as described in claim 1, characterized in that, The valve stem (5) consists of two parts: a top rod and a bottom valve core. The top of the valve seat (6) is in a funnel shape when it contacts the valve core, and the bottom of the valve core is a cone shape that fits the valve seat (6), thereby increasing the contact area between the two.

5. The high-pressure regulating valve with stable output pressure as described in claim 1, characterized in that, The valve seat (6) is provided with a first spring (18), the top of the first spring (18) abutting against the valve core at the bottom of the valve stem (5).

6. The high-pressure regulating valve with stable output pressure as described in claim 1, characterized in that, A buffer tube (19) is provided inside the pressure balance hole (14), and a flow-blocking block is provided inside the buffer tube (19), so as to reduce the pressure applied by the medium to the pressure balance chamber (13).

7. The high-pressure regulating valve with stable output pressure as described in claim 6, characterized in that, A plug (20) is provided inside the valve seat (6). The bottom end of the buffer tube (19) is in contact with the plug (20). When the valve stem (5) completely closes the inlet on the valve seat (6), the plug (20) can prevent the medium from continuing to enter the pressure balance chamber (13).

8. The high-pressure regulating valve with stable output pressure as described in claim 7, characterized in that, The blockage (20) is a telescopic reset structure, which consists of a sleeve, a plug cap telescopically installed in the sleeve, and a second spring, so that when the valve stem (5) rises and squeezes the medium in the pressure balance chamber (13), the medium can smoothly push open the blockage (20) and be discharged.

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