Pilot operated pressure reducing valve

Abstract

The present application relates to pressure relief valve technical field, specifically to a kind of pilot pressure reducing valve, comprising: a kind of pilot pressure reducing valve, comprising: pressure reducing valve body, pressure reducing valve body includes main valve body, main valve piston and main valve port;Input port;Output port;Pilot valve, set in the inside of pressure reducing valve body, pressure reducing valve body still be provided with for when the fluid pressure inside input pressure reducing valve occurs transient mutation stabilizing the opening and closing size of pressure reducing valve main valve port Stabilizing device. Through the energy-absorbing module of piston one and piston two cooperation in stabilizing device, when the fluid of input pressure reducing valve body suddenly pressure is higher, but not enough to exceed the energy-absorbing limit of energy-absorbing device, the pressure inside pilot valve does not change, main valve spring does not produce action, guarantees the stability of output fluid pressure, effectively improves the use stability and service life of downstream equipment, while also can improve the service life of main valve spring, to improve the service life of pressure reducing valve.

Description

A pilot-operated pressure reducing valve Technical Field

[0001] This invention relates to the field of pressure relief valve technology, specifically a pilot-operated pressure reducing valve. Background Technology

[0002] Existing pilot-operated pressure reducing valves regulate the valve opening degree through pressure feedback at the output port, thereby ensuring a stable output pressure at the set level. The valve opening degree of these valves is related to both the input and output fluid pressures, existing in a dynamic balance. The valve adjusts its opening degree in response to changes in the input fluid pressure. If the input fluid pressure suddenly changes, the pressure will inevitably cause the pressure reducing valve to open abruptly. This sudden increase in valve opening leads to greater fluctuations in the output fluid pressure. Although the pressure reducing valve will eventually self-regulate and restore dynamic balance between the output and input pressures, the pressure fluctuations can cause instability in the input pressure of equipment connected to the output port, potentially damaging downstream equipment.

[0003] To address this, a pilot-operated pressure reducing valve is proposed. By incorporating a buffer device, the valve port of the pilot-operated pressure reducing valve is prevented from experiencing large fluctuations in the output fluid pressure due to a sudden increase in the inlet pressure. Furthermore, the self-regulation of the pressure reducing valve is not affected when the inlet pressure continues to increase. Summary of the Invention

[0004] The purpose of this invention is to provide a pilot-operated pressure reducing valve that uses a stabilizing device to assist in controlling the opening and closing of the valve port on the valve body. This prevents abrupt changes in the opening and closing of the valve port when the fluid pressure at the inlet changes suddenly and briefly, thus avoiding abrupt changes in the output fluid pressure. This also prevents the output fluid pressure of the pressure reducing valve from fluctuating too much and the pressure reducing stability from deteriorating. At the same time, it also helps to reduce the deformation of the main valve spring of the pressure reducing valve and improve the service life of the main valve spring.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pilot-operated pressure reducing valve, comprising:

[0007] The pressure reducing valve body includes a main valve body, a main valve piston, and a main valve port.

[0008] The inlet is an opening on the body of the pressure reducing valve for introducing fluid into the interior of the pressure reducing valve body.

[0009] The pressure reducing valve body includes an output port, an opening on the valve body for outputting fluid after pressure reduction to other equipment; a pilot valve, an auxiliary valve located inside the pressure reducing valve body for operating the control mechanism of the valve body; a pilot pipe, a pipe located on the valve body connecting the input port of the pressure reducing valve body to the pilot valve; and a stabilizing device on the valve body for stabilizing the opening of the main valve port when the fluid pressure inside the valve body experiences a brief sudden change. This stabilizing device can be a damper mounted on the main valve piston to reduce the degree of main valve port opening, or other devices or components capable of controlling the degree of main valve port opening.

[0010] By incorporating a stabilizing device, the opening and closing stability of the main valve port is reduced when subjected to unnecessary pressure fluctuations. This minimizes fluctuations in the output fluid pressure, improves the pressure reduction stability of the pressure reducing valve, and consequently enhances the operational stability and service life of downstream equipment, thereby improving production stability. Simultaneously, reducing unnecessary movement of the main valve spring effectively extends its lifespan, thus increasing the overall service life of the pressure reducing valve.

[0011] Preferably, the stabilizing device includes a cavity formed in the pilot channel. The cavity can be located at the end of the pilot channel near the inlet or near the pilot valve. The cavity communicates with the inlet of the pilot valve. A piston one and a piston two are disposed inside the cavity. Piston one is located in the cavity near the inlet, and piston two is located in the cavity near the pilot valve. Piston one and piston two are arranged parallel to each other, isolating the pilot valve from the inlet. Both piston one and piston two can slide within the cavity. An energy-absorbing module for absorbing sudden pressure changes in the fluid is disposed inside the cavity between piston one and piston two. The energy-absorbing module can be a sponge, soft silicone, or other materials, devices, or components capable of absorbing the kinetic energy of the piston movement. It is worth noting that the space communicating with the pilot valve is filled with the same fluid flowing through the pressure reducing valve body. Furthermore, when piston one and piston two move towards the inlet, the cavity can hold all the fluid discharged from the pilot valve. When the pressure reducing valve is working normally, the pressure at the input port of the pressure reducing valve pushes piston one towards piston two. If the pressure still exists after the energy absorption module absorbs energy, it will be transmitted to piston two by the energy absorption module. Piston two compresses the space inside the cavity, squeezing all the fluid inside the cavity towards the pilot valve. The fluid starts the pilot valve to control the main valve to open. When the output pressure exceeds the set pressure, the feedback system at the output port will send feedback to the pilot valve, cutting off the pressure of the pilot valve. Under the action of the main valve spring, the main valve opening decreases, and the fluid at the pilot valve is discharged from the pilot valve and enters the cavity. The fluid inside the cavity squeezes piston two, piston two squeezes the energy absorption module, and finally the energy absorption module squeezes piston one, which then moves towards the input port. When the fluid pressure at the inlet suddenly and briefly increases, piston one moves towards piston two. After the energy absorption module absorbs the kinetic energy of piston one, the pressure fluctuation at the inlet disappears. The energy absorption module, having absorbed the kinetic energy of piston one, no longer transmits the motion to piston two. Piston two then stops squeezing the fluid towards the pilot valve. The main valve spring does not press down in response to this pressure change, the main valve port does not expand, and the fluctuation of the output fluid pressure does not increase. In other words, the output fluid pressure is more stable, improving the service life of downstream equipment. Furthermore, the service life of the main valve spring is improved by reducing unnecessary movements of the main valve spring.

[0012] Preferably, a sealed cavity is provided between piston one and piston two. The sealed cavity is fixedly installed inside the cavity and is made of corrosion-resistant metal or corrosion-resistant non-metallic material. Corrosion-resistant metals include stainless steel 304, 316L, duplex steel 2205, etc., while corrosion-resistant non-metals include plastics such as PTFE, PP, PVC, etc. A piston rod is fixedly connected between piston one and piston two, and the piston rod passes through the sealed cavity. A partition is fixedly installed in the middle of the piston rod. The partition is located inside the sealed cavity where the energy-absorbing module is located and can slide with the piston rod inside the sealed cavity. The sealed cavity and the partition cooperate to restrict the movement distance of piston one and piston two, preventing piston one or piston two from running out of the cavity during movement under fluid pressure, which would cause the stabilizing device to fail. Placing the energy-absorbing module inside the sealed cavity also prevents fluid from seeping into the energy-absorbing module after piston one and piston two wear, thus affecting the energy absorption effect. Moreover, combining the energy-absorbing module, piston one, and piston two into a whole makes it easier to install, disassemble, and replace the equipment, improving the ease of assembly and disassembly.

[0013] Preferably, the energy-absorbing module is a gas. The gas can be selected based on the fluid being depressurized by the pressure-reducing valve. A gas that does not readily react with the depressurizing fluid is selected as the filling gas for the energy-absorbing module. The gas fills the sealed cavity, and the partition divides the sealed cavity into two chambers that are not interconnected. The gas pressure inside each chamber is 1.2 to 2 standard atmospheres. During the movement of piston one and piston two, the piston plate compresses the space of one of the chambers, while the space of the other chamber expands. The gas inside the compressed chamber is also compressed accordingly, achieving the effect of energy absorption and buffering.

[0014] Furthermore, the partition plate has 4-6 small holes evenly spaced around the piston rod as its axis to facilitate gas passage. The diameter of the holes is 1mm-1.5mm. When one cavity is compressed, the holes allow gas to escape into another cavity. This facilitates the normal movement of pistons 1 and 2 during normal operation of the pressure reducing valve without affecting its pressure reducing sensitivity. However, when piston 1 is suddenly impacted by a pressure surge from the fluid, the limited airflow through the holes prevents the partition plate from moving quickly towards piston 2. If the pressure surge is brief, piston 1 will stop moving towards piston 2, the pilot valve will not respond to the pressure change, and the main valve will not open. If the pressure surge is continuous, piston 1 will continuously move towards piston 2, and gas will continuously move from the cavity near piston 2 through the holes towards the cavity near piston 1. Piston 2 will then continuously move towards the pilot valve, pressurizing it. Eventually, the main valve will open in response. When the pressure at the output port increases, the feedback system at the output port will provide normal feedback regulation. The vent design ensures the functional stability of the pressure reducing valve when the input fluid pressure does not change abruptly and it operates normally.

[0015] Optionally, the energy-absorbing module consists of two springs located at both ends of the partition, with both springs evenly wound around the piston rod. When the piston is suddenly impacted by a change in fluid pressure, the two springs first absorb the piston's kinetic energy before transmitting the pressure to the pilot valve, thus achieving the energy-absorbing effect. Compared to using gas as an energy-absorbing module, springs have lower requirements for the sealing performance of the sealed cavity, and lower maintenance and installation costs. However, their ability to absorb the impact of sudden changes in fluid pressure on the piston is not as good as that of gas.

[0016] Optionally, the energy-absorbing module uses a non-Newtonian fluid that fills the entire sealed cavity, and the area of ​​the baffle is 1 / 2 to 2 / 3 of the cross-section of the sealed cavity. The higher the pressure on the non-Newtonian fluid, the higher its viscosity; conversely, the lower the pressure, the lower the viscosity. When the fluid pressure at the inlet suddenly increases, squeezing piston one, piston one pushes the baffle towards piston two. At this time, the sudden impact increases the pressure between the baffle and the non-Newtonian fluid, preventing the baffle from moving towards piston two. Therefore, the pilot valve does not respond. When the pressure stabilizes, the movement of piston one and piston two becomes smooth, the squeezing pressure between the baffle and the non-Newtonian fluid decreases, the viscosity of the non-Newtonian fluid decreases, and the baffle can move normally between the non-Newtonian fluids. The pressure-reducing valve body functions normally, thus preventing large fluctuations in the fluid pressure at the outlet. The area ratio between the partition plate and the sealing section is 1 / 2 to 2 / 3. This is to reduce the resistance of the non-Newtonian fluid to the partition plate during its smooth movement, allowing the partition plate to move normally within the sealed cavity. However, under sudden pressure changes, the partition plate's area provides sufficient pressure to the non-Newtonian fluid, increasing its viscosity to prevent further movement. Compared to springs used as energy-absorbing modules, non-Newtonian fluids require higher sealing performance, but their energy absorption and blocking effects against sudden impacts are superior. Similarly, for gases, non-Newtonian fluids offer better impact blocking than gases. Due to their viscosity, the sealing requirements for non-Newtonian fluids are lower than those for gases. However, non-Newtonian fluids are prone to deterioration and performance degradation after prolonged storage, requiring frequent inspection and replacement.

[0017] Preferably, the pressure reducing valve body has an exchange pipe for exchanging fluids at both ends of piston one and piston two. A switch screw is installed in the middle of the exchange pipe to connect or disconnect it. After prolonged use, the fluid at the pressure reducing valve may deteriorate due to prolonged retention there, and its density may differ from the density of the fluid entering the pressure reducing valve body, potentially leading to a decrease in the pressure reducing effect. In this case, the switch screw can be opened to connect the exchange pipe, and the fluid will automatically exchange during normal operation of the pressure reducing valve. If the stabilizing device fails at this time, the fluid at the pilot valve is replaced, and then the switch screw is turned to close the exchange pipe, reactivating the stabilizing device. The exchange pipe only needs to be sealed so that the pressure supplied to the pilot valve at the exchange pipe is less than 10% lower than the pressure supplied to the pilot valve at piston two; a complete seal is not required. The exchange pipe improves the stability of the stabilizing device and the entire pressure reducing valve.

[0018] Preferably, a protective sleeve 1 for protecting the inner wall of the cavity is installed between piston 1 and one end of the cavity near piston 1, and a protective sleeve 2 for protecting the inner wall of the cavity is installed between piston 2 and one end of the cavity near piston 2. Both protective sleeves 1 and 2 are made of soft material and can be folded or unfolded with the movement of pistons 1 and 2. Protective sleeves 1 and 2 can be made of corrosion-resistant soft plastic or soft rubber and can be made into telescopic hoses. During the movement of pistons 1 and 2, protective sleeves 1 and 2 separate the fluid from the inner wall of the cavity without hindering the movement of pistons 1 and 2. Separating the fluid from the inner wall of the cavity prevents oxidation and corrosion of the inner wall of the cavity, avoids the modified inner wall of the cavity from infecting the movement of pistons 1 and 2, and also prevents impurities inside the fluid from entering the gap between pistons 1 and 2 and the inner wall of the cavity during the movement of pistons 1 and 2, thus accelerating the wear of pistons 1 and 2. This improves the stability and service life of the equipment.

[0019] Preferably, both piston one and piston two have arc-shaped grooves on their end faces, and magnets for attracting rust are installed inside the grooves. During use, the magnets attract rust and other metallic impurities in the fluid and trap them inside the grooves. Because rust and metallic impurities are generally sharp, they can easily scratch protective sleeves one and two, as well as the mating surfaces between pistons one and two and the cavity, further improving the stability and service life of the equipment.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The pilot-operated pressure reducing valve of the present invention, compared with the existing pilot-operated pressure reducing valve, is equipped with a stabilizing device. The stabilizing device isolates the fluid flowing through the pressure reducing valve body from the fluid inside the pilot valve. Through the cooperation of piston one and piston two in the stabilizing device with the energy absorption module, when the pressure of the fluid input to the pressure reducing valve body suddenly increases, but is not enough to exceed the energy absorption limit of the energy absorption device, the pressure inside the pilot valve will not change, that is, the main valve spring will not act, and the opening of the main valve port will not increase. This avoids the impact of sudden and short-term pressure increase on the stability of the output fluid pressure of the pressure reducing valve, effectively improving the operational stability and service life of downstream equipment, and also improving the service life of the main valve spring, thereby improving the service life of the pressure reducing valve.

[0022] 2. The pilot-operated pressure reducing valve of the present invention is provided with an exchange pipeline. The opening and closing of the exchange pipeline is controlled by a control switch screw, thereby controlling the exchange of fluid inside the pilot valve with the fluid inside the pressure reducing valve body. This prevents the fluid inside the pilot valve from deteriorating due to long-term lack of replacement, which would cause changes in fluid density and affect the performance of the pressure reducing valve due to the different fluid density inside the pressure reducing valve body. This improves the stability of the pressure reducing valve in use.

[0023] 3. The pilot-operated pressure reducing valve of this invention includes protective sleeves one and two, respectively, fixedly connected to piston one, piston two, and the cavity port. Protective sleeves one and two unfold or fold as pistons one and two move, isolating the fluid from the inner wall of the cavity and preventing impurities in the fluid from entering the gaps between pistons one and two and the inner wall of the cavity, thus accelerating wear on the inner wall of the cavity during piston movement. Furthermore, grooves are provided on the end faces of pistons one and two, and magnets are installed inside these grooves. The magnets attract rust that falls off the pipes and pressure reducing valve, preventing rust from puncturing the protective sleeves and extending their service life. Attached Figure Description

[0024] Figure 1 is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 is a cross-sectional view AA in Figure 1 of this invention;

[0026] Figure 3 is an enlarged view of point B in Figure 2 of this invention;

[0027] Figure 4 is an enlarged view of point C in Figure 3 of this invention;

[0028] Figure 5 is a three-dimensional structural schematic diagram of the stabilization device of the present invention;

[0029] Figure 6 is a schematic diagram of the operation between the switching screw and the exchange pipe of the present invention;

[0030] Figure 7 is a schematic diagram of the stabilizing device in Embodiment 2 of the present invention;

[0031] Figure 8 is a schematic diagram of the structure of three stabilizing devices according to embodiments of the present invention;

[0032] Figure 9 is a schematic diagram of the structure of four stabilizing devices according to embodiments of the present invention.

[0033] In the diagram: 1. Pressure reducing valve body; 2. Inlet; 3. Outlet; 4. Pilot valve; 5. Pilot pipe; 6. Cavity; 7. Piston 1; 8. Piston 2; 9. Energy absorption module; 901. Gas; 902. Spring; 903. Non-Newtonian fluid; 10. Sealing cavity; 11. Piston rod; 12. Baffle; 13. Orifice; 14. Exchange pipe; 15. Switch screw; 16. Protective sleeve 1; 17. Protective sleeve 2; 18. Groove; 19. Magnet; 20. Main valve spring. Detailed Implementation

[0034] Example 1: The pilot-operated pressure reducing valve is used for tap water pressure reduction, and the energy absorption module 9 uses gas 901.

[0035] Referring to Figures 1 to 6, a pilot-operated pressure reducing valve includes: 1. a pressure reducing valve body; 2. an inlet; 3. an outlet; 4. a pilot valve; 5. a pilot pipe; 6. a cavity; 7. a first piston; 8. a second piston; 9. an energy absorption module; 10. a sealing cavity; 11. a piston rod; 12. a partition; 13. a small hole; 14. an exchange pipe; 15. a switching screw; 16. a first protective sleeve; 17. a second protective sleeve; 18. a groove; 19. a magnet; and 20. a main valve spring.

[0036] The inlet 2 of the pressure reducing valve body 1 is connected to high-pressure tap water, and the outlet 3 is connected to downstream equipment to deliver the pressure-reduced tap water to the downstream equipment. A pilot valve 4 is located inside the pressure reducing valve body 1. A pilot channel 5 is opened above the inlet 2 and connects to the installation space of the pilot valve 4. A cylindrical cavity 6 is opened at the upper end of the pilot channel 5 of the pressure reducing valve body 1. Piston 1 7 is slidably installed on the side of the cavity 6 near the inlet 2, and piston 2 8 is slidably installed on the side of the cavity 6 near the pilot valve 4. Piston 1 7 and... Each end face of piston 2 8 has an arc-shaped groove 18, and a magnet 19 is embedded in the bottom of each groove 18. The end face of piston 1 7 is connected to one end of cavity 6 near input port 2 by a protective sleeve 16. The protective sleeve 16 is a flexible plastic tube that can be folded and unfolded as piston 1 7 moves. A protective sleeve 2 17 is connected between the end face of piston 2 8 and the end face of cavity 6 near pilot valve 4. The protective sleeve 2 17, like the protective sleeve 1 16, is a flexible plastic tube. A sealed cavity 10 is fixedly installed inside cavity 6. The sealed cavity 10 is made of PVC material and, like cavity 6, is cylindrical. The interior of the sealed cavity 10 is hollow. Piston 7 and piston 8 are fixedly connected by a piston rod 11, which passes through the center of the sealed cavity 10. A partition 12 is fixedly installed in the middle of the piston rod 11. The partition 12 is completely fitted to the inner wall of the sealed cavity 10 and can slide inside the sealed cavity 10. The partition 12 has a circumference of approximately [missing information - likely related to the piston rod 11]. The valve body 1 has six small holes 13 with a diameter of 1.5 mm. The sealed cavity 10 is filled with gas 901, which is nitrogen. The gas pressure of gas 901 inside the sealed cavity 10 is 1.2 standard atmospheres. The pressure reducing valve body 1 has an exchange pipe 14. The exchange pipe 14 connects the installation space of the pilot valve 4 and the space of the inlet 2. A switch screw 15 is installed in the middle of the exchange pipe 14. The switch screw 15 extends out of the pressure reducing valve body 1 for easy rotation by the user. The switch screw 15 will cut off the exchange pipe 14 after being tightened.

[0037] The specific workflow is as follows:

[0038] Before operation: Connect the pressure relief valve to the input and output pipes, and check the exterior of the pressure reducing valve body 1 for signs of liquid leakage. If there are signs of leakage, check the cause and repair it in time. If there are no signs of leakage, it can be used normally.

[0039] During operation: Use a wrench to adjust the adjusting bolt on the top of the pressure reducing valve body 1 to control the output pressure of the pressure reducing valve. Then, use a wrench to rotate the switch screw 15 counterclockwise to connect the two ends of the exchange pipe 14. Water enters the pilot valve 4 from the exchange pipe 14 to activate the pilot valve 4, and the water will fill the entire installation space of the pilot valve 4. Then, rotate the switch screw 15 clockwise and tighten it to disconnect the exchange pipe 14. The stabilizing device starts to start and work. As long as the pressure of the water inside the pressure reducing valve body 1 does not change abruptly, the pressure reducing valve works normally. The opening and closing of the main valve port is jointly regulated by the pressure of the input port 2 and the pressure of the output port 3. The output pressure and input pressure of the pressure reducing valve are in a dynamic balance state. Piston 1 7 and Piston 2 8 will also move back and forth in the cavity 6 with the self-adjustment of the pressure reducing valve. The gas 901 and the partition 12 inside the sealing cavity 10 will not hinder the normal operation of the pressure reducing valve. When piston 7 and piston 8 reciprocate, protective sleeve 16 and protective sleeve 27 also unfold and fold accordingly. Protective sleeve 16 and protective sleeve 217 isolate water from the inner wall of cavity 6, preventing the inner wall of cavity 6 from contacting water and rusting. At the same time, they also prevent impurities in the water from entering the gap between piston 7, piston 28 and cavity 6 and accelerating the wear between piston 7, piston 28 and the inner wall of cavity 6. Meanwhile, the magnet 19 inside the groove 18 at the end face of piston 7 and piston 28 will also attract metal impurities in the water, such as rust. Since rust is generally sharp and flaky, the magnet 19 will attract and store it inside the groove 18, preventing rust from scratching protective sleeve 16 and protective sleeve 217.

[0040] When the pressure of the water entering the pressure reducing valve body 1 suddenly increases briefly, the pressure of the water entering from the pilot channel 5 also suddenly increases. The piston 7 is suddenly lifted by the water pressure and will move quickly towards the piston 8, causing the partition 12 and the piston 8 to move quickly in the same direction. However, when the partition 12 moves towards the piston 8, the gas 901 inside the sealing cavity 10 needs to be discharged from the space enclosed by the partition 12 and the sealing cavity 10 near the piston 8 through the small hole 13 to the space on the other side of the partition 12. Although the piston 7 moves very fast, the exhaust speed of the small hole 13 is limited. Since the partition 12 is fixedly connected to the piston 7, it will absorb the kinetic energy of the piston 7, and the speed of the piston 7 will decrease. If the pressure of the water at the inlet 2 decreases, the piston 8 will not squeeze the water towards the pilot valve 4, the pilot valve 4 will not control the main valve to continue to open, and the pressure of the output water will not fluctuate greatly, resulting in a more stable output water pressure. If the increase in water pressure is continuous, the baffle 12 will continue to move towards the piston 2 8. The piston 2 8 will continue to squeeze the water towards the pilot valve 4. The pilot valve 4 will respond and first control the main valve port to open wider. When the water pressure at the output port 3 rises, the feedback system at the output port 3 will then feed back to the pilot valve 4. The pressure at the pilot valve 4 will be interrupted, and under the action of the main valve spring 20, the opening degree of the main valve port will be reduced again.

[0041] After work: Check the condition of the pressure reducing valve from time to time, and open the switch screw 15 from time to time to connect the exchange pipe 14 to replace the water inside the pilot valve 4.

[0042] Example 2:

[0043] Referring to Figure 7, unlike Embodiment 1, the cavity 6 is T-shaped, with the end near the pilot valve 4 being larger than the end near the inlet 2. The sealing cavity 10 is also T-shaped. The sealing cavity 10 is fixedly installed inside the cavity 6 and tightly fitted to the cavity 6. The piston 1 7 is smaller than the piston 2 8. The size of the partition 12 is the same as the inner wall diameter of the small end of the T-shaped sealing cavity 10 and fits tightly.

[0044] When subjected to a sudden increase in water pressure, piston 7 will also drive the baffle 12 to move rapidly toward piston 8. The gas 901 inside the sealed cavity 10 will also hinder the movement of the baffle 12 due to the small hole 13, thereby slowing down the speed of the baffle 12 and absorbing the kinetic energy of the baffle 12, piston 7, and piston 8. When the pressure continues to increase, piston 7 will continue to drive piston 8 to move toward the pilot valve 4. Piston 8 squeezes the water inside the cavity 6 toward the pilot valve 4. The pilot valve 4 causes the main valve port to open wider, increasing the pressure of the water at the output port 3. This pressure is then fed back to the pilot valve 4, where the pressure of the water inside the pilot valve 4 is cut off. Under the action of the main valve spring 20, the water inside the pilot valve 4 is squeezed toward the cavity 6 where piston 8 is located. Piston 8 drives the baffle 12 to move toward piston 7. It is worth noting that because the diameter of the sealing cavity 10 where the partition 12 is currently located is larger than the diameter of the partition 12, the gas 901 will not hinder the movement of the partition 12, piston 1 7, and piston 2 8 due to the exhaust speed of the small hole 13 before the partition 12 enters the sealing cavity 10 with the same diameter as the partition 12. The feedback adjustment of the pressure reducing valve is faster than that of Embodiment 1.

[0045] The functions and implementation processes not described in this embodiment are the same as in Embodiment 1.

[0046] Both Embodiment 1 and Embodiment 2 can achieve the effect of making the main valve port of the pressure reducing valve not respond when the fluid in the input pressure reducing valve suddenly and briefly increases in pressure, thereby improving the stability of the pressure of the output fluid of the pressure reducing valve. Compared with Embodiment 1, Embodiment 2 can quickly adjust its balance through the feedback mechanism of the pressure reducing valve even when the input pressure changes continuously. However, the processing of the "T"-shaped cavity 6 and the "T"-shaped sealing cavity 10 is more difficult, and the protective sleeve 16 at the small end of the "T"-shaped cavity 6 is more difficult to install.

[0047] Example 3:

[0048] Referring to Figure 8, unlike Embodiment 1 and Embodiment 2, the energy absorption module 9 consists of two springs 902 evenly wound around the piston rod 11. Both springs 902 are located inside the sealing cavity 10 and on the left and right sides of the partition plate 12.

[0049] Compared to Embodiments 1 and 2, using spring 902 as the energy absorption module 9 reduces the sealing requirements for the sealing cavity 10, resulting in lower assembly and maintenance costs. However, the greater the deformation of spring 902 within its elastic limit, the greater its elastic force. Therefore, its ability to absorb the impact of sudden increases in water pressure is less than in Embodiment 1, and its effect on stabilizing the water pressure output of the pressure reducing valve is not as good as in Embodiments 1 and 2. Furthermore, because spring 902 occupies a certain volume, the required volume of the sealing cavity 10 is larger.

[0050] The functions and implementation processes not described in this embodiment are the same as in Embodiment 1.

[0051] Example 4:

[0052] Referring to Figure 9, unlike the above embodiment, the energy absorption module 9 uses a non-Newtonian fluid 903, and the volume of the non-Newtonian fluid 903 is greater than 90% of the volume of the sealed cavity 10. The area of ​​the partition 12 is half of the cross-sectional area of ​​the sealed cavity 10, and no small holes 13 are made on the partition 12.

[0053] Compared to Embodiments 1 and 2, due to the viscosity of the non-Newtonian fluid 903, the sealing requirement of the sealing cavity 10 is lower than that when gas 901 is used in Embodiments 1 and 2. However, the sealing requirement of the sealing cavity 10 is higher than that when spring 902 is used as the energy absorption module 9 in Embodiment 3. Compared to Embodiments 1 and 2, using non-Newtonian fluid 903 as the energy absorption module 9 provides better energy absorption and blocking effects against the impact of sudden water pressure increases, and the stabilization effect on water pressure output is better than in Embodiment 3. However, also due to the viscosity of non-Newtonian fluid 903, the resistance of the feedback system at the output port 3 when adjusting the pilot valve 4 during normal operation of the pressure reducing valve is greater, and the sensitivity of the feedback adjustment is lower.

[0054] The functions and implementation processes not described in this embodiment are the same as in Embodiment 1.

[0055] The above embodiments are merely illustrative examples of the numerous embodiments of the present invention. Many variations can be made without departing from the principles of the present invention. Embodiments made by those skilled in the art without creative effort are also within the protection scope of the present invention.

Claims

1. A pilot-operated pressure reducing valve, comprising: Pressure reducing valve body (1); inlet (2), an opening on the pressure reducing valve body (1) for inputting fluid into the pressure reducing valve body (1); outlet (3), an opening on the pressure reducing valve body (1) for outputting fluid after pressure reduction by the pressure reducing valve body (1) to other equipment; pilot valve (4), an auxiliary valve located inside the pressure reducing valve body (1) for operating the control mechanism of the pressure reducing valve body (1); pilot pipe (5), a pipe located on the pressure reducing valve body (1) for connecting the inlet (2) of the pressure reducing valve body (1) and the pilot valve (4); characterized in that: the pressure reducing valve body (1) is provided with a stabilizing device for stabilizing the opening and closing size of the main valve port of the pressure reducing valve when the fluid pressure inside the pressure reducing valve undergoes a brief change; the stabilizing device includes a cavity (6) opened on the pilot pipe (5), the cavity (6) and the pilot valve (4) are connected to the main valve port of the pressure reducing valve. The inlet is connected, and the cavity (6) is provided with piston one (7) and piston two (8). Piston one (7) and piston two (8) isolate the pilot valve (4) from the inlet (2). Both piston one (7) and piston two (8) can slide inside the cavity (6). The cavity (6) between piston one (7) and piston two (8) is provided with an energy absorption module (9) for absorbing sudden pressure changes in the fluid. A sealed cavity (10) is provided between piston one (7) and piston two (8). A piston rod (11) is fixedly connected between piston one (7) and piston two (8) and the piston rod (11) passes through the sealed cavity (10). A partition plate (12) is fixedly installed in the middle of the piston rod (11). The partition plate (12) is located inside the sealed cavity (10) where the energy absorption module (9) is located and can slide with the piston rod (11) inside the sealed cavity (10).

2. The pilot-operated pressure reducing valve according to claim 1, characterized in that: The energy-absorbing module (9) is a gas (901), which fills the interior of the sealed cavity (10). The partition (12) divides the interior of the sealed cavity (10) into two chambers.

3. The pilot-operated pressure reducing valve according to claim 1, characterized in that: The energy absorption module (9) consists of two springs (902) located at both ends of the partition (12), and both springs (902) are evenly wound around the piston rod (11).

4. A pilot-operated pressure reducing valve according to claim 1, characterized in that: The energy-absorbing module (9) is a non-Newtonian fluid (903), which fills the entire sealed cavity (10). The area of ​​the partition (12) is 1 / 2 to 2 / 3 of the cross-section of the sealed cavity (10).

5. A pilot-operated pressure reducing valve according to claim 2, characterized in that: The partition (12) is provided with a plurality of small holes (13) that facilitate the passage of gas (901).

6. A pilot-operated pressure reducing valve according to claim 1, characterized in that: The pressure reducing valve body (1) is provided with an exchange pipe (14) for exchanging fluid between the two ends of piston one (7) and piston two (8), and a switch screw (15) for connecting or disconnecting the exchange pipe (14) is provided in the middle of the exchange pipe (14).

7. A pilot-operated pressure reducing valve according to claim 6, characterized in that: A protective sleeve (16) for protecting the inner wall of the cavity (6) is installed between the piston (7) and one end of the cavity (6) near the piston (7), and a protective sleeve (17) for protecting the inner wall of the cavity (6) is installed between the piston (8) and one end of the cavity (6) near the piston (8).

8. A pilot-operated pressure reducing valve according to claim 7, characterized in that: Both piston one (7) and piston two (8) have arc-shaped grooves (18) on their end faces, and magnets (19) for adsorbing rust are provided inside the grooves (18).

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