Pilot valve assembly and electromagnetic valve

Abstract

The invention relates to the technical field of pilot valves, in particular to a pilot valve assembly and an electromagnetic valve. The pilot valve assembly comprises a valve body, a pilot valve head, a pressure relief pipe, a pressure tapping pipe, a filtering pressure measuring assembly and a heat preservation assembly, the first end of the pressure relief pipe is connected with the top of the valve body, the second end of the pressure relief pipe is connected with the first end of the pilot valve head, the first end of the pressure tapping pipe is connected with the bottom of the valve body, and the second end of the pressure tapping pipe is connected with the second end of the pilot valve head. The filtering pressure measuring assembly is arranged on at least one of the pressure relief pipe and the pressure tapping pipe and used for filtering media entering the pilot valve head, and the heat preservation assembly is arranged on the periphery of the pilot valve head and used for heating the pilot valve head. According to the pilot valve assembly, the performance of the pilot valve assembly can be improved, it is ensured that the main valve is opened in time for pressure relief, and then the reaction efficiency of a reactor is improved.

Description

Technical Field

[0001] This invention relates to the field of pilot valve technology, and more specifically to a pilot valve assembly and a solenoid valve. Background Technology

[0002] In nuclear power plant operation, pilot-operated safety valves are core equipment for ensuring unit pressure safety. Their function revolves around three core aspects: precise pressure control, safety protection, and stable operation. They are adapted to the special operating conditions of nuclear power systems, such as high temperature and high pressure, and the presence of radioactive media. Through the staged sealing structure of the pilot valve and the main valve, pilot-operated safety valves can achieve high-precision pressure sealing, effectively preventing leakage of critical media such as primary coolant and secondary steam, avoiding media loss and system pressure fluctuations, maintaining stable operating conditions for core equipment such as the reactor coolant system and steam generator, and reducing the risk of unplanned shutdowns.

[0003] When an overpressure occurs, the pilot valve can quickly sense the pressure signal and open first. By relieving pressure, it drives the main valve to act quickly and safely discharge the overpressure medium to the containment or pressure relief box according to the preset path. This accurately controls the system pressure within the safety limit and prevents the reactor core from overheating and overpressure and damage to the equipment shell.

[0004] However, in related technologies, the pilot valve is prone to damage, affecting the normal opening and closing of the entire pilot-operated safety valve, preventing the main valve from opening in time to relieve pressure, resulting in a decrease in reactor power or an emergency shutdown. Summary of the Invention

[0005] This invention is based on the inventor's discoveries and understanding of the following facts and problems: Through research and practice, the inventors discovered that the heating system of the pilot valve assembly has a heating blind zone and large temperature fluctuations, which easily leads to local temperatures falling below the crystallization point, resulting in medium crystallization. When medium crystallization occurs, the damage to the valve head of the pilot valve assembly is cascading. First, the hard crystal particles can scratch the sealing surface of the valve head, destroying the seal integrity and causing internal or external leakage in the pilot valve assembly. Second, crystals can deposit in the gap between the valve core and the valve sleeve, forming mechanical resistance, causing the valve core to jam or even become stuck, preventing the pilot valve from opening and closing accurately. This, in turn, causes the main valve to lose pressure control, resulting in failure to operate or malfunction, and inability to open and release pressure in time. At the same time, the crystals also accelerate the wear and corrosion of the valve head components, shortening their service life. In high-risk scenarios such as nuclear power plants, this may lead to equipment damage, personnel safety risks, or systemic production accidents.

[0006] This invention aims to at least partially address one of the technical problems in related art. To this end, embodiments of this invention provide a pilot valve assembly that can improve the performance of the pilot valve assembly, ensuring timely opening of the main valve for pressure relief, thereby improving the reactor's reaction efficiency.

[0007] This invention also proposes an electromagnetic valve.

[0008] The pilot valve assembly of this invention includes: a valve body and a pilot valve head; a pressure relief pipe and a pressure tapping pipe, wherein a first end of the pressure relief pipe is connected to the top of the valve body, a second end of the pressure relief pipe is connected to the first end of the pilot valve head, a first end of the pressure tapping pipe is connected to the bottom of the valve body, and a second end of the pressure tapping pipe is connected to the second end of the pilot valve head; a filter pressure measuring assembly, which is disposed on at least one of the pressure relief pipe and the pressure tapping pipe, and is used to filter the medium entering the pilot valve head; and a heat insulation assembly, which is disposed on the outer periphery of the pilot valve head and is used to heat the pilot valve head.

[0009] The pilot valve assembly of this invention incorporates a filter pressure testing component on at least one of the pressure relief pipe and pressure tapping pipe between the valve body and the pilot valve head. This filter pressure testing component filters the medium, preventing impurities in the medium from flowing into the pilot valve head and thus avoiding crystallization of impurities within the pilot valve head. Furthermore, by insulating the outer periphery of the pilot valve head, the heat insulation component heats the outer periphery of the pilot valve head, improving the heating uniformity of the pilot valve head and preventing local temperatures below the medium's crystallization point within the pilot valve head. This also prevents crystallization within the pilot valve head, improves the performance of the pilot valve assembly, ensures timely opening of the main valve for pressure relief, and thereby improves the reactor's reaction efficiency.

[0010] In some embodiments, the filter pressure measurement assembly includes a housing and a filter element. The housing has a chamber that communicates with the pressure relief pipe or the pressure tapping pipe. The filter element is disposed in the chamber and is detachably connected to the housing.

[0011] In this embodiment, the housing is connected to the pressure relief pipe or pressure tapping pipe, which facilitates the connection of the filter pressure measuring component to the pressure relief pipe or pressure tapping pipe. By setting a filter element inside the housing, the filter element can filter the medium flowing between the valve body and the pilot valve body, thereby intercepting impurities in the medium and preventing impurities in the medium from entering the pilot valve head. This prevents impurities in the medium from crystallizing in the pilot valve head and improves the performance of the pilot valve component.

[0012] In some embodiments, the filter pressure measuring assembly further includes a conduit and a pressure gauge, one end of the conduit being connected to the housing and the other end of the conduit being connected to the pressure gauge.

[0013] This embodiment uses a pressure gauge to detect the pressure of the medium flowing between the valve body and the pilot valve head, thereby determining whether the pilot valve head needs maintenance and whether the filter needs cleaning, ensuring the filtration performance of the filter pressure measurement assembly.

[0014] In some embodiments, the filter pressure testing assembly further includes a sealing ring, and both ends of the housing are provided with connecting flanges, which are connected to the pressure relief pipe or the pressure tapping pipe, and the sealing ring is disposed between the filter element and the connecting flange.

[0015] This embodiment facilitates the connection between the housing and the pressure relief pipe or pressure tapping pipe by providing connecting flanges at both ends of the housing, and the flange connection has high reliability. By providing a sealing ring between the filter element and the connecting flange, the media is prevented from flowing out from the gap between the filter element and the connecting flange, thus improving the sealing performance of the chamber.

[0016] In some embodiments, there are two filter pressure measuring components, one of which is located on the pressure relief pipe and the other is located on the pressure tapping pipe.

[0017] This embodiment improves the filtration performance of the filter pressure measuring components by installing filter pressure measuring components on both the pressure relief pipe and the pressure tapping pipe, which facilitates the filtration of the medium flowing between the valve body and the pilot valve head.

[0018] In some embodiments, the insulation assembly includes an insulation shell and an insulation element. A portion of the pilot valve head is disposed within the insulation shell, and the insulation element is disposed within the insulation shell and is used to heat the portion of the pilot valve head located within the insulation shell. The insulation shell facilitates the fixing of the insulation element to the outer surface of the pilot valve head, allowing the insulation element to heat the pilot valve head and preventing crystallization of the medium within the pilot valve head.

[0019] In some embodiments, the heat insulation component includes a first heating cable, a second heating cable, a first heat dissipation pad, and a second heat dissipation pad. A portion of the pilot valve head is disposed between the first heat dissipation pad and the second heat dissipation pad. The first heating cable is disposed on the side of the first heat dissipation pad away from the second heat dissipation pad, and the second heating cable is disposed on the side of the second heat dissipation pad away from the first heat dissipation pad.

[0020] In this embodiment, by placing a portion of the pilot valve head between the first heat dissipation pad and the second heat dissipation pad, the heating temperature of the first heating cable is conducted to the first heat dissipation pad, and the heating temperature of the second heating cable is conducted to the second heat dissipation pad. This can improve the uniformity of temperature distribution within the insulation shell, thereby improving the uniformity of temperature within the pilot valve head.

[0021] In some embodiments, the bottom of the first heating cable is provided with a terminal block, a portion of which extends out of the insulation shell, and the bottom of the second heat dissipation pad is provided with a temperature sensor for detecting the temperature inside the insulation shell.

[0022] This embodiment, through the setting of wiring terminals and temperature sensors, facilitates the control of the heating temperature of the heating cable while supplying power to it, and through the setting of temperature sensors, facilitates the acquisition of the real-time temperature inside the insulation shell.

[0023] In some embodiments, a waterproof box is provided on the outside of the heat insulation shell, and a temperature control component is provided inside the waterproof box. The temperature control component includes a display panel, an adjustment button and a buzzer. The display panel is connected to the temperature sensor and the wiring terminal. The adjustment button is connected to the heat insulation component to adjust the heating temperature of the heat insulation component. The buzzer is used to emit a buzzing sound when the temperature detected by the temperature sensor exceeds a preset threshold.

[0024] In this embodiment, the wiring terminals extend out of the insulation shell and are electrically connected to the display panel, and the temperature sensor is electrically connected to the display panel, which facilitates the adjustment of the heating temperature of the heating cable according to the temperature inside the insulation shell, thereby improving the heating accuracy of the insulation component.

[0025] The solenoid valve of this invention includes a pilot valve assembly as described in any of the above embodiments.

[0026] The solenoid valve of this invention, by including the pilot valve assembly of the above embodiments, can improve the performance of the solenoid valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the pilot valve assembly according to an embodiment of the present invention.

[0028] Figure 2 This is a side view of the pilot valve assembly according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the filter pressure measurement component of the pilot valve assembly according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the insulation component of the pilot valve assembly according to an embodiment of the present invention.

[0031] Figure label: Valve body 1, Pilot valve head 2, Pressure relief pipe 3, Pressure tap 4, Filter pressure testing assembly 5, housing 51, chamber 511, filter element 52, conduit 53, pressure gauge 54, sealing ring 55, connecting flange 56, annular protrusion 561, support block 57. Thermal insulation component 6, thermal insulation outer shell 61, first outer shell 611, second outer shell 612, thermal insulation element 62, first heating cable 621, second heating cable 622, first heat dissipation pad 623, second heat dissipation pad 624. Terminal block 63, temperature sensor 64, Waterproof box 7, Temperature control component 8, display panel 81, adjustment buttons 82, buzzer 83. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following is in conjunction with the appendix Figures 1-4 The pilot valve assembly of the present invention will be described in detail.

[0034] The pilot valve assembly of this invention includes a valve body 1, a pilot valve head 2, a pressure relief pipe 3, a pressure tapping pipe 4, a filter pressure measuring component 5, and a heat insulation component 6. The first end of the pressure relief pipe 3 is connected to the top of the valve body 1, and the second end of the pressure relief pipe 3 is connected to the first end of the pilot valve head 2. The first end of the pressure tapping pipe 4 is connected to the bottom of the valve body 1, and the second end of the pressure tapping pipe 4 is connected to the second end of the pilot valve head 2. The filter pressure measuring component 5 is disposed on at least one of the pressure relief pipe 3 and the pressure tapping pipe 4, and is used to filter the medium entering the pilot valve head 2. The heat insulation component 6 is disposed on the outer periphery of the pilot valve head 2, and is used to heat the pilot valve head 2.

[0035] The pilot valve assembly of this invention incorporates a filter pressure testing component 5 on at least one of the pressure relief pipe 3 and pressure tapping pipe 4 between the valve body 1 and the pilot valve head 2. This filter pressure testing component 5 filters the medium, preventing impurities in the medium from flowing into the pilot valve head 2, thus avoiding crystallization of impurities within the pilot valve head 2. Furthermore, by providing a heat insulation component 6 around the pilot valve head 2, the heat insulation component 6 heats the outer periphery of the pilot valve head 2, improving the heating uniformity of the pilot valve head 2 and preventing local temperatures below the medium's crystallization point within the pilot valve head 2. This also prevents crystallization within the pilot valve head 2, improving the performance of the pilot valve assembly, ensuring timely opening of the main valve for pressure relief, and thereby improving the reactor's reaction efficiency.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, a pressure relief pipe 3 is fixedly connected to the top of the valve body 1, and a pressure tapping pipe 4 is fixedly connected to one side of the bottom of the valve body 1. One end of the pressure relief pipe 3 is fixedly connected to the pilot valve head 2, and one end of the pressure tapping pipe 4 is fixedly connected to the bottom of the pilot valve head 2. In other words, the top of the valve body 1 is connected to the side of the pilot valve head 2 through the pressure relief pipe 3, and the bottom of the valve body 1 is connected to the bottom of the pilot valve head 2 through the pressure tapping pipe 4, so as to realize the flow of the medium between the valve body 1 and the pilot valve head 2.

[0037] The filter pressure measuring component 5 is located on at least one of the pressure relief pipe 3 and the pressure tapping pipe 4. This can be understood as the filter pressure measuring component 5 being located on the pressure relief pipe 3, or the filter pressure measuring component 5 being located on the pressure tapping pipe 4, or there are two filter pressure measuring components 5, one on the pressure relief pipe 3 and the other on the pressure tapping pipe 4.

[0038] The heat insulation component 6 covers the outer periphery of the pilot valve head 2, which facilitates the heating of the surface of the pilot valve head 2, improves the temperature uniformity inside the pilot valve head 2, avoids crystallization due to excessively low temperature inside the pilot valve head 2, and enables the pilot valve head 2 to work in a suitable working environment, thereby improving the performance and service life of the pilot valve head 2.

[0039] In some embodiments, such as Figures 1-3 As shown, the filter pressure measuring assembly 5 includes a housing 51 and a filter element 52. The housing 51 has a chamber 511, which is connected to the pressure relief pipe 3 or the pressure tapping pipe 4. The filter element 52 is disposed in the chamber 511 and is detachably connected to the housing 51.

[0040] In this embodiment, the housing 51 is connected to the pressure relief pipe 3 or the pressure tapping pipe 4, which facilitates the connection between the filter pressure measuring component 5 and the pressure relief pipe 3 or the pressure tapping pipe 4. By setting a filter element 52 inside the housing 51, the filter element 52 can filter the medium flowing between the valve body 1 and the pilot valve body 1, thereby intercepting impurities in the medium and preventing impurities in the medium from entering the pilot valve head 2. This prevents impurities in the medium from crystallizing in the pilot valve head 2 and improves the performance of the pilot valve component.

[0041] In some embodiments, the filter pressure measuring assembly 5 further includes a conduit 53 and a pressure gauge 54, one end of the conduit 53 being connected to the housing 51 and the other end of the conduit 53 being connected to the pressure gauge 54.

[0042] Specifically, such as Figures 1-3 As shown, a conduit 53 is fixedly connected to one side of the housing 51. A pressure gauge 54 is installed on the side of the conduit 53 away from the housing 51. The pressure gauge 54 is used to detect the pressure of the medium flowing between the valve body 1 and the pilot valve head 2, thereby determining whether the pilot valve head 2 needs maintenance and whether the filter element 52 needs cleaning, ensuring the filtration performance of the filter pressure testing assembly 5. Understandably, if the pressure gauge 54 shows abnormal pressure, the filter pressure testing assembly 5 can be removed from between the valve body 1 and the pilot valve head 2, the filter element 52 can be cleaned or replaced, and then it can be reinstalled between the valve body 1 and the pilot valve head 2. If the pressure gauge 54 still shows abnormal pressure, then the pilot valve head 2 needs maintenance.

[0043] Optionally, the pressure gauge 54 and the conduit 53 are connected by a thread. Threaded connections are simple, reliable, and easy to replace.

[0044] In some embodiments, such as Figures 1-3 As shown, the filter pressure measuring assembly 5 also includes a sealing ring 55. Both ends of the housing 51 are provided with connecting flanges 56, which are connected to the pressure relief pipe 3 or the pressure tapping pipe 4. The sealing ring 55 is located between the filter element 52 and the connecting flange 56.

[0045] In this embodiment, connecting flanges 56 are provided at both ends of the housing 51, which facilitates the connection between the housing 51 and the pressure relief pipe 3 or the pressure tapping pipe 4, and the flange connection has high reliability. By providing a sealing ring 55 between the filter element 52 and the connecting flange 56, the medium is prevented from flowing out from the gap between the filter element 52 and the connecting flange 56, thereby improving the sealing performance of the chamber 511.

[0046] Optionally, a support block 57 is provided on the inner wall surface of the housing 51. The support block 57 is used to fix the position of the filter element 52. By setting the support block 57, the connection convenience and installation accuracy of the filter element 52 are improved.

[0047] Optionally, the filter element 52 is a barrel-type filter screen, and the sealing ring 55 is a soft gasket. The soft gasket is located between the filter element 52 and the connecting flange 56. One end of the connecting flange 56 has an annular protrusion 561, which abuts against the soft gasket to fix the position of the filter element 52 and prevent the filter element 52 from shifting. For example, the annular protrusion 561 is threaded to the housing 51, and the connecting flange 56 is flanged to the pressure relief pipe 3 or the pressure tapping pipe 4.

[0048] In some embodiments, such as Figures 1-3 As shown, there are two filter pressure testing components 5, one of which is located on the pressure relief pipe 3, and the other is located on the pressure tapping pipe 4.

[0049] In this embodiment, by setting filter pressure measuring components 5 on both the pressure relief pipe 3 and the pressure tapping pipe 4, it is convenient to filter the medium flowing between the valve body 1 and the pilot valve head 2, thereby improving the filtration performance of the filter pressure measuring components 5.

[0050] When using the pilot valve assembly, first install the filter pressure testing assembly 5 on the pressure relief pipe 3 and the pressure tapping pipe 4. Use the pressure gauge 54 to determine whether the pilot valve head 2 needs maintenance and whether the filter element 52 of the filter pressure testing assembly 5 needs cleaning. If the filter element 52 needs cleaning, first remove the filter pressure testing assembly 5, separate the connecting flange 56 from the housing 51, remove the sealing ring 55, then remove the filter element 52 for cleaning. After cleaning, reinstall it into the housing 51 and then install the filter pressure testing assembly 5 on the pressure relief pipe 3 and the pressure tapping pipe 4. By installing the filter pressure testing assembly 5 on the pressure relief pipe 3 and the pressure tapping pipe 4, impurities in the medium can be prevented from flowing into the pilot valve head, thus avoiding crystallization of impurities in the pilot valve head. Furthermore, the two pressure gauges 54 can determine whether the pilot valve head needs cleaning and issue an early warning.

[0051] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the insulation component 6 includes an insulation shell 61 and an insulation element 62. A portion of the pilot valve head 2 is located within the insulation shell 61, and the insulation element 62 is located within the insulation shell 61 and is used to heat the portion of the pilot valve head 2 located within the insulation shell 61. The insulation shell 61 facilitates the fixing of the insulation element 62 to the outer surface of the pilot valve head 2, allowing the insulation element 62 to heat the pilot valve head 2 and preventing crystallization of the medium inside the pilot valve head 2.

[0052] Optionally, the insulation housing 61 includes a first housing 611 and a second housing 612, which are detachably connected to facilitate the installation of the insulation component 62 inside the insulation housing 61 and the covering of the outer surface of the pilot valve head 2.

[0053] In some embodiments, the heat insulation component 62 includes a first heating cable 621, a second heating cable 622, a first heat dissipation pad 623, and a second heat dissipation pad 624. A portion of the pilot valve head 2 is disposed between the first heat dissipation pad 623 and the second heat dissipation pad 624. The first heating cable 621 is disposed on the side of the first heat dissipation pad 623 away from the second heat dissipation pad 624, and the second heating cable 622 is disposed on the side of the second heat dissipation pad 624 away from the first heat dissipation pad 623.

[0054] In this embodiment, by placing a portion of the pilot valve head 2 between the first heat dissipation pad 623 and the second heat dissipation pad 624, the heating temperature of the first heating cable 621 is conducted to the first heat dissipation pad 623, and the heating temperature of the second heating cable 622 is conducted to the second heat dissipation pad 624. This can improve the uniformity of temperature distribution within the insulation shell 61, thereby improving the uniformity of temperature within the pilot valve head 2.

[0055] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the first heating cable 621 is installed inside the first housing 611, the second heating cable 622 is fixed inside the second housing 612, the first heat dissipation pad 623 and the second heat dissipation pad 624 are disposed between the first heating cable 621 and the second heating cable 622, the first side of the first heat dissipation pad 623 abuts against the first heating cable 621, the first side of the second heat dissipation pad 624 abuts against the second heating cable 622, and a portion of the pilot valve head 2 is disposed between the second side of the first heat dissipation pad 623 and the second side of the second heat dissipation pad 624, so that the first heat dissipation pad 623 and the second heat dissipation pad 624 can cover the pilot valve head 2 located inside the heat insulation housing 61.

[0056] Optionally, at least one of the first heating cable 621 and the second heating cable 622 is an MI cable. At least one of the first heat dissipation pad 623 and the second heat dissipation pad 624 is a thick silicone pad. The thick silicone pad can evenly conduct the temperature of the first heating cable 621 and the second heating cable 622 to the thick silicone pad, improve the temperature uniformity inside the insulation shell 61, and thus ensure the temperature uniformity inside the pilot valve head 2.

[0057] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the bottom of the first heating cable 621 is provided with a terminal 63, and part of the terminal 63 extends out of the heat insulation shell 61. The bottom of the second heat dissipation pad 624 is provided with a temperature sensor 64, which is used to detect the temperature inside the heat insulation shell 61.

[0058] In this embodiment, the use of terminal block 63 and temperature sensor 64 facilitates the control of the heating temperature of the heating cable while supplying power to it. The use of temperature sensor 64 also facilitates the acquisition of the real-time temperature inside the insulation shell 61.

[0059] Optionally, the first heating cable 621 and the second heating cable 622 are electrically connected.

[0060] In some embodiments, a waterproof box 7 is provided on the outside of the heat insulation shell 61, and a temperature control component 8 is provided inside the waterproof box 7. The temperature control component 8 includes a display panel 81, an adjustment button 82, and a buzzer 83. The display panel 81 is connected to the temperature sensor 64 and the wiring terminal 63. The adjustment button 82 is connected to the heat insulation component 62 to adjust the heating temperature of the heat insulation component 62. The buzzer 83 is used to emit a buzzing sound when the temperature detected by the temperature sensor 64 exceeds a preset threshold.

[0061] Specifically, such as Figure 1 , Figure 2 and Figure 4As shown, terminal 63 extends through insulation housing 61 and is electrically connected to display panel 81, and temperature sensor 64 is electrically connected to display panel 81, facilitating adjustment of heating cable temperature based on temperature inside insulation housing 61, thereby improving heating accuracy of insulation component 6. Furthermore, waterproof box 7 can cover display panel 81 to prevent accidental contact and water inflow, improving operational safety.

[0062] In this embodiment, the insulation component 6 is first installed on the pilot valve head 2. The heating temperature of the insulation component 6 can be adjusted by pressing the adjustment button 82 according to the actual medium in the pilot valve head 2. During daily use, if the temperature deviation inside the insulation shell 61 reaches a certain value, the buzzer 83 will sound an alarm to remind maintenance personnel to perform maintenance.

[0063] When installing the insulation component 6, first align the first outer shell 611 and the second outer shell 612, then check whether there is any misalignment between the first heating cable 621 and the second heating cable 622, and the first heat dissipation pad 623 and the second heat dissipation pad 624. After ensuring that the first heat dissipation pad 623 and the second heat dissipation pad 624 are tightly attached to the pilot valve head 2, and after observing that there is no misalignment, connect the first outer shell 611 and the second outer shell 612, for example, by using bolts for fixing. Connect the power supply through the terminal block, then open the waterproof box 7 and adjust the temperature to a suitable level using the display panel 81 and adjustment buttons 82. The temperature sensor 64 transmits the temperature to the display panel 81 and the remote control terminal in real time. Heating will automatically stop when the heating temperature of the first heating cable 621 and the second heating cable 622 exceeds the preset threshold. At the same time, the alarm threshold of the pressure gauge 54 is set. When the pressure gauge 54 shows a pressure drop exceeding the alarm threshold, or when the operation has been running for a certain period of time, the filter element 52 needs to be cleaned. First, close the shut-off valves of the pressure tapping pipe 4 and the pressure relief pipe 3 to cut off the medium passage. Then, disassemble and open the filter pressure measuring assembly 5, remove the filter element 52, and then blow the filter element 52 to remove the impurities trapped on it. Finally, reset the barrel filter screen and install the connecting flange 56 on the housing 51 to complete the cleaning and maintenance.

[0064] This embodiment integrates the filter pressure measuring component 5 onto the pressure tapping pipe 4 and the pressure relief pipe 3, achieving integrated filtration and monitoring. This removes impurities and reduces crystallization, and is accompanied by a pressure gauge 54 for real-time early warning. The filter element 52 is removable for quick cleaning, solving the problem of excessive crystallization and difficulty in detecting blockages in related technologies. By incorporating the insulation component 6 and the temperature control component 8, precise temperature control and protection are achieved, making crystal suppression more reliable. Double-layer insulation is provided using the first heating cable 621, the second heating cable 622, the first heat dissipation pad 623, and the second heat dissipation pad 624, reducing heating blind spots. The temperature control component 8 is further protected by a waterproof box 7.

[0065] The solenoid valve of this invention includes a pilot valve assembly employing any of the above embodiments.

[0066] The solenoid valve of this invention, by including the pilot valve assembly of the above embodiments, can improve the performance of the solenoid valve.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pilot valve assembly characterized by, The application relates to a pilot valve assembly. The pilot valve assembly comprises: a valve body and a pilot valve head; a pressure relief pipe and a pressure taking pipe, a first end of the pressure relief pipe being connected to a top of the valve body, a second end of the pressure relief pipe being connected to a first end of the pilot valve head, a first end of the pressure taking pipe being connected to a bottom of the valve body, and a second end of the pressure taking pipe being connected to a second end of the pilot valve head; a filter pressure measuring assembly arranged on at least one of the pressure relief pipe and the pressure taking pipe, the filter pressure measuring assembly being used for filtering medium entering the pilot valve head; 2. The pilot valve assembly of claim 1, wherein, a heat preservation assembly arranged on an outer periphery of the pilot valve head, the heat preservation assembly being used for heating the pilot valve head.

3. The pilot valve assembly of claim 2, wherein, The filter pressure measuring assembly comprises a shell and a filter, the shell having a cavity in communication with the pressure relief pipe or the pressure taking pipe, and the filter being arranged in the cavity and detachably connected to the shell.

4. The pilot valve assembly of claim 3, wherein, The filter pressure measuring assembly further comprises a conduit and a pressure gauge, one end of the conduit being connected to the shell, and the other end of the conduit being connected to the pressure gauge.

5. The pilot valve assembly of any one of claims 1-4, wherein, The filter pressure measuring assembly further comprises a sealing ring, both ends of the shell are provided with connecting flanges connected to the pressure relief pipe or the pressure taking pipe, and the sealing ring is arranged between the filter and the connecting flange.

6. The pilot valve assembly of claim 1, wherein, The filter pressure measuring assembly is two, one of the filter pressure measuring assemblies is arranged on the pressure relief pipe, and the other filter pressure measuring assembly is arranged on the pressure taking pipe.

7. The pilot valve assembly of claim 6, wherein, The heat preservation assembly comprises a heat preservation shell and a heat preservation element, part of the pilot valve head is arranged in the heat preservation shell, and the heat preservation element is arranged in the heat preservation shell and used for heating the part of the pilot valve head in the heat preservation shell.

8. The pilot valve assembly of claim 7, wherein, The heat preservation element comprises a first heating cable, a second heating cable, a first heat dissipation pad and a second heat dissipation pad, part of the pilot valve head is arranged between the first heat dissipation pad and the second heat dissipation pad, the first heating cable is arranged on a side of the first heat dissipation pad away from the second heat dissipation pad, and the second heating cable is arranged on a side of the second heat dissipation pad away from the first heat dissipation pad.

9. The pilot valve assembly of claim 8, wherein, A bottom of the first heating cable is provided with a wiring terminal, part of the wiring terminal extends out of the heat preservation shell, and a bottom of the second heat dissipation pad is provided with a temperature sensor used for detecting the temperature in the heat preservation shell.

10. An electromagnetic valve characterized by comprising: An outer side of the heat preservation shell is provided with a waterproof box, the waterproof box is provided with a temperature control assembly, the temperature control assembly comprises a display panel, an adjusting button and a buzzer, the display panel is connected to the temperature sensor and the wiring terminal, the adjusting button is connected to the heat preservation element to adjust the heating temperature of the heat preservation element, and the buzzer is used for emitting a buzzing sound when the temperature detected by the temperature sensor exceeds a preset threshold. The application further relates to a pilot valve assembly comprising any one of the pilot valve assemblies according to claims 1-9.

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