Anti-leakage self-operated pressure reducing valve

Abstract

The utility model discloses an anti-leakage self-operated pressure reducing valve which comprises a valve body, the valve body comprises a valve front inlet and a valve rear outlet, a communication port is arranged between the valve front inlet and the valve rear outlet, a valve rod is connected in the valve body in a sliding mode, the valve rod can abut against the communication port, and the anti-leakage self-operated pressure reducing valve further comprises a cavity. A diaphragm is connected to the end, away from the valve body, of the valve rod, the cavity is divided into a front cavity and a rear cavity by the diaphragm, the front cavity is communicated with the valve front inlet, a pressure guide pipe is communicated between the rear cavity and the valve rear outlet, and a stop valve is arranged on the pressure guide pipe. The utility model provides an anti-leakage self-operated pressure reducing valve, which can control the valve to be in a closed state when the pressure of an outlet behind the valve is increased, and also can cut off medium transmission in time when a diaphragm is damaged, so that the medium is prevented from leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure reducing valve technical field especially relates to a kind of self force type pressure reducing valve of preventing external leakage. BACKGROUND

[0002] For example, the publication number "CN211624326U", discloses "self force type pressure reducing valve", including valve body, valve cover is equipped on valve body, diaphragm is sealingly arranged between valve body and valve cover, valve disc is arranged in valve body, one end of valve disc is attached to diaphragm, valve seat is arranged in the other end of valve disc in valve body, valve seat cooperates with valve disc to block valve body, cavity is equipped in valve cover, valve rod is slidingly arranged in cavity, valve rod passes through diaphragm and is fixed with valve disc, pressure plate is sleeved on valve rod, diaphragm is fixed on valve disc by pressure plate, spring is sleeved on valve rod, both ends of spring are respectively abutted against pressure plate and inner top wall of valve cover, high-pressure control loop is arranged between valve inlet and cavity, low-pressure control loop is arranged between valve outlet and cavity. But in actual application, the pressure reducing valve of this kind cannot achieve the effect of closing valve in time when diaphragm is damaged, which can cause external leakage. SUMMARY

[0003] In view of the problem that the existing technology in the background art can cause external leakage of medium under special conditions, the utility model provides a self force type pressure reducing valve capable of preventing external leakage, which can control the valve to be in a closed state when the outlet pressure behind the valve increases, and can cut off the medium transmission in time when the diaphragm is damaged, thereby avoiding external leakage of medium.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions.

[0005] A self force type pressure reducing valve capable of preventing external leakage includes a valve body, the valve body includes a valve inlet and a valve outlet, a communication port is arranged between the valve inlet and the valve outlet, a valve rod is slidingly connected in the valve body, the valve rod can abut against the communication port, a cavity is further included, a diaphragm is connected to one end of the valve rod away from the valve body, the cavity is divided into a front cavity and a rear cavity by the diaphragm, the front cavity is communicated with the valve inlet, a pressure guide pipe is communicated between the rear cavity and the valve outlet, and a cut-off valve is arranged on the pressure guide pipe.

[0006] As an important pressure regulating device in fluid pipeline system, the basic working principle of pressure reducing valve is to dynamically balance the fluid pressure through mechanical structure. The typical structure includes four core components: valve body, valve stem, spring and diaphragm. When the fluid flows into the valve cavity through the inlet, the initial pressure acts on the lower end of the valve stem. At this time, the diaphragm is connected with the valve stem, and the adjustable spring provided on the upper part of the diaphragm provides a reverse force. In the normal working state, when the outlet pressure rises, the diaphragm is pushed upward by the pressure and moves the valve stem to reduce the flow area, thereby reducing the output pressure; on the contrary, when the outlet pressure decreases, the spring pushes the diaphragm downward to increase the opening degree of the valve core, so as to realize the pressure rise. This mechanical feedback mechanism makes the outlet pressure stable within the preset range.

[0007] The existing pressure reducing valve cannot meet the stringent pressure control requirements of modern industrial systems. The traditional pure mechanical structure adjustment method has been difficult to meet the requirements of precise control and rapid response. These problems will affect the working efficiency of the equipment itself, and also pose a threat to the safe operation of the overall system. Therefore, based on the traditional pressure reducing valve, the cavity is divided into front cavity and rear cavity by the diaphragm in the present application, wherein the front cavity is communicated with the valve front inlet, and the rear cavity is communicated with the valve rear outlet, so that the pressure changes on the valve front inlet and the valve rear outlet can be fed back to both sides of the diaphragm in real time, thereby driving the diaphragm to move through the pressure difference and controlling the opening and closing of the valve. Further, in the present application, the rear cavity and the valve rear outlet are communicated through a pressure guide pipe, and a shut-off valve is arranged on the pressure guide pipe. Since the diaphragm is a consumable part, it may be damaged during long-term operation, resulting in communication between the front cavity and the rear cavity, and thus causing the medium to directly flow into the valve rear outlet, causing production accidents; in the present application, when the diaphragm is damaged, the diaphragm is in a descending state due to the inability to generate a pressure difference on both sides of the diaphragm, so that the valve is closed, and the medium flows into the valve rear outlet through the pressure guide pipe. Since the shut-off valve is arranged on the pressure guide pipe, the pressure guide pipe can be directly controlled to be closed through the shut-off valve, so that the medium cannot form an external leakage state after the diaphragm is damaged, wherein the shut-off valve can be manually adjusted, or connected with an automatic sensing device to detect the flowing state of the medium and adaptively start and stop.

[0008] As a preferred embodiment, an adjusting unit is arranged on the cavity, and a spring is arranged between the adjusting unit and the diaphragm. The adjusting unit can move relative to the cavity, and the spring can generate a pushing force on the diaphragm to control the pressure point change of the diaphragm.

[0009] Preferably, the adjustment unit includes an adjustment screw threaded onto the cavity. The adjustment screw is connected to a mounting seat located inside the cavity, and a spring is connected to the side of the mounting seat away from the adjustment screw. By rotating the adjustment screw, the mounting seat can be moved up and down relative to the cavity, thereby changing the compressed state of the spring and adjusting the pressure point.

[0010] Preferably, the cavity includes a mounting wall, the mounting seat is slidably connected to the mounting wall, and a sealing ring is provided between the mounting wall and the mounting seat. The mounting wall on the cavity and the sealing ring between the mounting wall and the mounting seat ensure the sealing of the mounting seat during movement, thereby ensuring the smooth operation of the entire pressure reducing valve.

[0011] Preferably, a positioning post is connected to the diaphragm, and the spring is sleeved on the positioning post. By providing a positioning post on the diaphragm and allowing the spring to be sleeved on it, the spring is prevented from shifting during diaphragm movement, ensuring radial stability between the spring and the diaphragm.

[0012] Preferably, the pressure guiding tube includes a cavity end connection port communicating with the rear cavity, and the cavity end connection port is located on the upper side of the rear cavity. By positioning the cavity end connection port of the pressure guiding tube on the upper side of the rear cavity, it is possible to prevent the medium in the rear cavity from flowing back through the pressure guiding tube under normal conditions during operation.

[0013] Preferably, the pressure-conducting pipe includes a valve end connection port communicating with the downstream outlet of the valve, and the valve end connection port is located on the upper side of the downstream outlet of the valve. By positioning the valve end connection port on the upper side of the valve outlet, it is ensured that the medium will flow into the downstream chamber through the pressure-conducting pipe only when the downstream outlet of the valve is pressurized.

[0014] Preferably, the shut-off valve is equipped with an adjustment handle, which controls the opening and closing of the shut-off valve. The adjustment handle allows for manual intervention under special conditions, preventing malfunctions of the electronic automatic sensing components and improving control reliability.

[0015] Preferably, the valve stem includes a sealing head disposed near the connection port, the sealing head having a conical structure. The sealing head, disposed near the connection port, abuts against the connection port, thereby achieving a sealing effect.

[0016] Preferably, the valve inlet is connected to the upper part of the connecting port, and the valve outlet is connected to the lower part of the connecting port. Setting the valve inlet and outlet in a high-inlet, low-outlet configuration avoids media blockage and ensures smooth media flow.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) It can control the valve to be closed when the outlet pressure after the valve increases, and can also cut off the medium transmission in time when the diaphragm is damaged to avoid medium leakage;

[0019] (2) It can improve the stability of the device and ensure that the pressure can be reached through the pressure guide tube only under the pressurization state, thus avoiding backflow. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention.

[0021] Figure 2 This is a partial sectional view of the present invention.

[0022] In the picture:

[0023] 1 Valve body, 11 Valve inlet, 12 Valve outlet, 13 Connecting port;

[0024] 2 valve stems, 21 sealing heads;

[0025] 3 chambers, 31 front chamber, 32 rear chamber, 33 adjustment unit, 331 adjustment screw, 332 mounting base, 34 spring, 35 mounting wall, 351 sealing ring;

[0026] 4 diaphragms, 41 positioning posts;

[0027] 5. Pressure guide tube, 51. Shut-off valve, 52. Cavity end connection port, 53. Valve end connection port, 54. Adjustment handle. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1:

[0030] like Figure 1 As shown, a self-regulating pressure reducing valve with anti-external leakage includes a valve body 1, which includes a valve inlet 11 and a valve outlet 12. A connecting port 13 is provided between the valve inlet 11 and the valve outlet 12. A valve stem 2 is slidably connected inside the valve body 1 and can abut against the connecting port 13. The valve body 1 also includes a cavity 3. A diaphragm 4 is connected to the end of the valve stem 2 away from the valve body 1. The cavity 3 is divided into a front cavity 31 and a rear cavity 32 by the diaphragm 4. The front cavity 31 is connected to the valve inlet 11, and a pressure guiding pipe 5 is connected between the rear cavity 32 and the valve outlet 12. A shut-off valve 51 is provided on the pressure guiding pipe 5.

[0031] As an important pressure regulating device in fluid pipeline systems, the pressure reducing valve works by dynamically balancing fluid pressure through a mechanical structure. A typical structure comprises four core components: valve body 1, valve stem 2, spring 34, and diaphragm 4. When fluid flows into the valve chamber through the inlet, the initial pressure acts on the lower end of the valve stem 2. At this time, the diaphragm 4, connected to the valve stem 2, has an adjustable spring 34 on its upper part providing a counterforce. Under normal operating conditions, when the outlet pressure increases, the diaphragm 4 is pushed upwards by the pressure, causing the valve stem 2 to move and reduce the flow cross-sectional area, thereby lowering the output pressure. Conversely, when the outlet pressure decreases, the spring 34 pushes the diaphragm 4 downwards, increasing the valve core opening and achieving a pressure recovery. This mechanical feedback mechanism stabilizes the outlet pressure within a preset range.

[0032] Existing pressure-reducing valves have significant limitations in handling abnormally high downstream pressures. When downstream pressure rises sharply due to equipment malfunction (such as sudden closure of the end valve) or abnormal conditions, the passive regulation mechanism of traditional pressure-reducing valves struggles to achieve rapid shut-off. Although the diaphragm 4 can sense the pressure anomaly and transmit an action signal through the linkage mechanism, the valve core's movement is limited by the combined effects of the spring 34's preload and the fluid dynamic pressure, often allowing only limited stroke adjustment. This is especially problematic under high pressure differentials, creating a continuous internal leakage path. This phenomenon is particularly dangerous in chemical pipelines or fire-fighting water supply systems, potentially leading to pipeline rupture or equipment overpressure damage. More importantly, traditional structures lack independent pressure surge detection modules and emergency shut-off mechanisms; relying solely on mechanical linkage systems results in response delays, failing to meet the real-time requirements of modern industrial pressure safety protection.

[0033] As the core sensing component of the entire control system, the structural reliability of diaphragm 4 directly affects the operational safety of the equipment. Existing pressure reducing valves generally use single-layer elastic metal or rubber composite diaphragms 4, which are prone to fatigue cracking under long-term alternating loads. When diaphragm 4 experiences partial damage, it first leads to inaccurate pressure sensing. At this point, the balance between the preload of spring 34 and the fluid pressure is disrupted, and the valve core may remain fully open, losing its pressure-reducing function. More seriously, a damaged diaphragm 4 may cause the control mechanism to completely jam, resulting in the outlet pressure directly matching the inlet pressure, creating a dangerous high-pressure direct-flow state. Because traditional designs do not include diaphragm 4 condition monitoring devices, operators often need to periodically disassemble and inspect to detect potential problems. This passive maintenance method cannot provide timely warnings when diaphragm 4 experiences progressive damage. Sudden failure of diaphragm 4 can directly trigger a major safety accident.

[0034] The aforementioned technical bottlenecks prevent existing pressure-reducing valves from meeting the stringent pressure control requirements of modern industrial systems. Traditional purely mechanical adjustment methods are insufficient to meet requirements for precise control and rapid response. These issues affect the equipment's performance and threaten the safe operation of the entire system. Therefore, this application, based on a traditional pressure-reducing valve, divides the interior of the cavity 3 into a front cavity 31 and a rear cavity 32 using a diaphragm 4. The front cavity 31 is connected to the valve inlet 11, while the rear cavity 32 is connected to the valve outlet 12. This allows pressure changes at the valve inlet 11 and outlet 12 to be fed back to both sides of the diaphragm 4 in real time, thereby driving the diaphragm 4 to move and control the valve's opening and closing through the pressure difference. Furthermore, in this application, the rear cavity 32 is connected to the valve outlet 12 via a pressure-conducting pipe 5, which is equipped with a shut-off valve 51. Since the diaphragm 4 is a consumable component, it may break during long-term operation, causing communication between the front chamber 31 and the rear chamber 32, resulting in the medium flowing directly into the outlet 12 after the valve, causing a production accident. In this application, when the diaphragm 4 breaks, since no pressure difference can be generated on both sides of the diaphragm 4, the diaphragm 4 is in a descending state, causing the valve to close. At the same time, the medium flows to the outlet 12 after the valve through the pressure guide pipe 5. Since a shut-off valve 51 is provided on the pressure guide pipe 5, the shut-off valve 51 can directly control the closure of the pressure guide pipe 5, so that the medium cannot leak after the diaphragm 4 breaks. The shut-off valve 51 can be manually adjusted or connected to an automatic sensing device to detect the flow state of the medium and perform adaptive closure and start-up.

[0035] like Figure 1 As shown, the pressure guiding pipe 5 includes a cavity end connection port 52 communicating with the rear cavity 32, and the cavity end connection port 52 is located on the upper side of the rear cavity 32. By positioning the cavity end connection port 52 on the upper side of the rear cavity 32, it is possible to prevent the medium in the rear cavity 32 from flowing back through the pressure guiding pipe 5 under normal conditions during operation.

[0036] like Figure 1 As shown, the pressure guiding pipe 5 includes a valve end connection port 53 that communicates with the downstream outlet 12 of the valve. The valve end connection port 53 is located on the upper side of the downstream outlet 12 of the valve. By positioning the valve end connection port 53 on the upper side of the valve outlet, it is ensured that the medium will flow into the downstream chamber 32 through the pressure guiding pipe 5 when the downstream outlet 12 is pressurized.

[0037] like Figure 1 As shown, the shut-off valve 51 is equipped with an adjusting handle 54, which can control the opening and closing of the shut-off valve 51. The adjusting handle 54 on the shut-off valve 51 allows for manual intervention under special conditions, preventing malfunctions of the electronic automatic sensing components and improving the reliability of the control.

[0038] like Figure 1As shown, the valve stem 2 includes a sealing head 21 disposed near the connecting port 13. The sealing head 21 has a conical structure. The sealing head 21 is disposed on the side of the valve stem 2 near the connecting port 13. The conical sealing head 21 can abut against the connecting port 13, thereby achieving a sealing effect on the connecting port 13.

[0039] like Figure 1 As shown, the valve inlet 11 is connected to the upper part of the connecting port 13, and the valve outlet 12 is connected to the lower part of the connecting port 13. Setting the valve inlet 11 and the valve outlet 12 in a high-in, low-out configuration avoids media blockage and ensures smooth media flow.

[0040] Example 2:

[0041] like Figure 2 As shown, in this embodiment, an adjustment unit 33 is provided on the cavity 3, and a spring 34 is provided between the adjustment unit 33 and the diaphragm 4. The adjustment unit 33 can move relative to the cavity 3. The adjustment unit 33 is provided on the cavity 3, and the spring 34 is provided between the adjustment unit 33 and the diaphragm 4. The spring 34 can generate a pushing force on the diaphragm 4, thereby controlling the change of the pressure point of the diaphragm 4.

[0042] like Figure 2 As shown, the adjustment unit 33 includes an adjustment screw 331, which is threaded onto the cavity 3. The adjustment screw 331 is connected to a mounting seat 332 disposed inside the cavity 3. A spring 34 is connected to the side of the mounting seat 332 away from the adjustment screw 331. By rotating the adjustment screw 331, the mounting seat 332 can be moved up and down relative to the cavity 3, thereby changing the compressed state of the spring 34 and thus adjusting the pressure point.

[0043] like Figure 2 As shown, the cavity 3 includes a mounting wall 35, and a mounting seat 332 is slidably connected to the mounting wall 35. A sealing ring 351 is provided between the mounting wall 35 and the mounting seat 332. The mounting wall 35 is provided on the cavity 3, and the sealing ring 351 is provided between the mounting wall 35 and the mounting seat 332. The sealing ring 351 can ensure the sealing of the mounting seat 332 during the movement process, thereby ensuring that the entire pressure reducing valve can work smoothly.

[0044] like Figure 2 As shown, a positioning post 41 is connected to the diaphragm 4, and a spring 34 is sleeved on the positioning post 41. The positioning post 41 is provided on the diaphragm 4, and the spring 34 can be sleeved on the positioning post 41, thereby preventing the spring 34 from shifting during the movement of the diaphragm 4 and ensuring the radial stability between the spring 34 and the diaphragm 4.

[0045] In addition to the above structure, this embodiment also includes a valve body 1, which includes a valve inlet 11 and a valve outlet 12. A communication port 13 is provided between the valve inlet 11 and the valve outlet 12. A valve stem 2 is slidably connected inside the valve body 1. The valve stem 2 can abut against the communication port 13. It also includes a cavity 3. A diaphragm 4 is connected to the end of the valve stem 2 away from the valve body 1. The cavity 3 is divided into a front cavity 31 and a rear cavity 32 by the diaphragm 4. The front cavity 31 is connected to the valve inlet 11. A pressure guide pipe 5 is connected between the rear cavity 32 and the valve outlet 12. A shut-off valve 51 is provided on the pressure guide pipe 5.

[0046] Existing pressure-reducing valves cannot meet the stringent pressure control requirements of modern industrial systems. Traditional purely mechanical adjustment methods are no longer sufficient to meet requirements for precise control and rapid response. These problems affect the working efficiency of the equipment itself and also pose a threat to the safe operation of the overall system. Therefore, this application, based on the traditional pressure-reducing valve, divides the interior of the cavity 3 into a front cavity 31 and a rear cavity 32 through a diaphragm 4. The front cavity 31 is connected to the valve inlet 11, while the rear cavity 32 is connected to the valve outlet 12. This allows pressure changes at the valve inlet 11 and the valve outlet 12 to be fed back to both sides of the diaphragm 4 in real time, thereby driving the diaphragm 4 to move through the pressure difference and controlling the opening and closing of the valve. Furthermore, in this application, the rear cavity 32 and the valve outlet 12 are connected by a pressure-conducting pipe 5, on which a shut-off valve 51 is installed. Since the diaphragm 4 is a consumable component, it may break during long-term operation, causing communication between the front chamber 31 and the rear chamber 32, resulting in the medium flowing directly into the outlet 12 after the valve, causing a production accident. In this application, when the diaphragm 4 breaks, since no pressure difference can be generated on both sides of the diaphragm 4, the diaphragm 4 is in a descending state, causing the valve to close. At the same time, the medium flows to the outlet 12 after the valve through the pressure guide pipe 5. Since a shut-off valve 51 is provided on the pressure guide pipe 5, the shut-off valve 51 can directly control the closure of the pressure guide pipe 5, so that the medium cannot leak after the diaphragm 4 breaks. The shut-off valve 51 can be manually adjusted or connected to an automatic sensing device to detect the flow state of the medium and perform adaptive closure and start-up.

[0047] The pressure guiding pipe 5 includes a cavity end connection port 52 that communicates with the rear cavity 32, and the cavity end connection port 52 is located on the upper side of the rear cavity 32. By positioning the cavity end connection port 52 on the upper side of the rear cavity 32, it is possible to prevent the medium in the rear cavity 32 from flowing back through the pressure guiding pipe 5 under normal conditions during operation.

[0048] The pressure-conducting pipe 5 includes a valve end connection port 53 that communicates with the downstream outlet 12 of the valve. The valve end connection port 53 is located on the upper side of the downstream outlet 12 of the valve. By positioning the valve end connection port 53 on the upper side of the valve outlet, it is ensured that the medium will flow into the downstream chamber 32 through the pressure-conducting pipe 5 when the downstream outlet 12 is pressurized.

[0049] The shut-off valve 51 is equipped with an adjusting handle 54, which can control the opening and closing of the shut-off valve 51. The adjusting handle 54 on the shut-off valve 51 allows for manual intervention under special conditions, preventing malfunctions of the electronic automatic sensing components and improving the reliability of the control.

[0050] The valve stem 2 includes a sealing head 21 disposed near the connecting port 13. The sealing head 21 has a conical structure. The sealing head 21 is disposed near the connecting port 13 on the side of the valve stem 2. The conical sealing head 21 can abut against the connecting port 13, thereby achieving a sealing effect on the connecting port 13.

[0051] The valve inlet 11 is connected to the upper part of the connecting port 13, and the valve outlet 12 is connected to the lower part of the connecting port 13. The valve inlet 11 and the valve outlet 12 are set in a high-inlet, low-outlet configuration to avoid media blockage and ensure smooth media flow.

Claims

1. A self-operated pressure reducing valve for preventing external leakage, comprising a valve body, the valve body including a pre-valve inlet and a post-valve outlet, a communication port being provided between the pre-valve inlet and the post-valve outlet, and a valve stem slidably connected within the valve body, the valve stem being capable of abutting against the communication port, characterized in that, It also includes a cavity, and a diaphragm is connected to the end of the valve stem away from the valve body. The cavity is divided into a front cavity and a rear cavity by the diaphragm. The front cavity is connected to the valve inlet, and a pressure guide tube is connected between the rear cavity and the valve outlet. A shut-off valve is provided on the pressure guide tube.

2. The self-regulating pressure reducing valve for preventing external leakage as described in claim 1, characterized in that, An adjustment unit is provided on the cavity, and a spring is provided between the adjustment unit and the diaphragm. The adjustment unit is capable of moving relative to the cavity.

3. The self-regulating pressure reducing valve for preventing external leakage as described in claim 2, characterized in that, The adjustment unit includes an adjustment screw, which is threaded onto the cavity. The adjustment screw is connected to a mounting base located inside the cavity, and a spring is connected to the side of the mounting base away from the adjustment screw.

4. The self-regulating pressure reducing valve for preventing external leakage as described in claim 3, characterized in that, The cavity includes a mounting wall, the mounting seat is slidably connected to the mounting wall, and a sealing ring is provided between the mounting wall and the mounting seat.

5. A self-operated pressure reducing valve for preventing external leakage as described in claim 2, characterized in that, The diaphragm is connected to a positioning post, and the spring is sleeved on the positioning post.

6. The self-operated pressure reducing valve for preventing external leakage as described in claim 1, characterized in that, The pressure guiding tube includes a cavity end connection port that communicates with the rear cavity, and the cavity end connection port is located on the upper side of the rear cavity.

7. A self-operated pressure reducing valve for preventing external leakage as described in claim 1, characterized in that, The pressure guiding pipe includes a valve end connection port that communicates with the outlet after the valve, and the valve end connection port is located on the upper side of the outlet after the valve.

8. A self-operated pressure reducing valve for preventing external leakage according to any one of claims 1-7, characterized in that, The shut-off valve is equipped with an adjustment handle, which can control the opening and closing of the shut-off valve.

9. A self-operated pressure reducing valve for preventing external leakage according to any one of claims 1-7, characterized in that, The valve stem includes a sealing head disposed near the communication port, and the sealing head has a conical structure.

10. A self-operated pressure reducing valve for preventing external leakage according to any one of claims 1-7, characterized in that, The valve inlet is connected to the upper part of the connecting port, and the valve outlet is connected to the lower part of the connecting port.

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