Medium size ssv self-protecting diaphragm solenoid valve

Abstract

The utility model discloses a medium -sized SSV self -protection diaphragm type electromagnetic valve, including valve body, the both sides of valve body are fixedly connected with the pipe body, one side of valve body is equipped with indicating mechanism, and indicating mechanism includes support plate, and support plate fixedly connected in one side of valve body, and one side fixedly connected with fixed plate at support plate top, and the groove is opened to one side of fixed plate, and the groove is slidably connected with slide, and one side fixedly connected with connecting plate at slide, and one side of connecting plate is equipped with mounting plate, and the temperature -sensitive paint layer is brushed to one side away from connecting plate of mounting plate, when the valve body appears abnormal heating and reaches certain temperature value through setting indicating mechanism, and the staff can visually and rapidly judge that the valve body appears the trouble, thereby facilitating the staff to overhaul electromagnetic valve, prevents electromagnetic valve abnormal heating from causing to avoid burning equipment or causes the security hidden danger.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, and in particular to a medium-sized SSV self-protecting diaphragm solenoid valve. Background Technology

[0002] A diaphragm solenoid valve is an automated actuator that uses electromagnetic force to control the flow of fluid. It is a two-position, two-normally closed structure and is mainly used in the hydraulic or pneumatic systems of industrial equipment. Its core working principle is: when the solenoid coil is energized, it generates magnetic force to drive the valve body to move and open the fluid passage. After the power is cut off, the spring resets and closes the valve, thus achieving precise control of the medium flow.

[0003] When operators encounter abnormal overheating malfunctions while using solenoid valves, they mostly rely on using a temperature gun to measure the temperature of the solenoid valve surface. However, it is difficult for operators to measure the temperature of the solenoid valve at all times while on-site. When the abnormal overheating caused by the malfunction reaches a certain temperature, it is difficult for operators to detect it in time, which can easily lead to the solenoid valve burning out the equipment or causing safety hazards. Therefore, medium-sized SSV self-protecting diaphragm solenoid valves are needed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a medium-sized SSV self-protecting diaphragm solenoid valve.

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

[0006] A medium-sized SSV self-protecting diaphragm solenoid valve includes a valve body, with pipes fixedly connected to both sides of the valve body, and an indicating mechanism provided on one side of the valve body;

[0007] The indicating mechanism includes a support plate, which is fixedly connected to one side of the valve body. A fixing plate is fixedly connected to the top side of the support plate. A slot is opened through one side of the fixing plate, and a sliding plate is slidably connected in the slot. A connecting plate is fixedly connected to one side of the sliding plate. An mounting plate is provided on one side of the connecting plate, and a temperature-sensitive paint layer is applied to the side of the mounting plate away from the connecting plate.

[0008] By adopting the above technical solution and setting an indicator mechanism, when the valve body overheats abnormally and reaches a certain temperature value, the staff can intuitively and quickly determine that the valve body is malfunctioning. This facilitates the staff to repair the solenoid valve and prevents the equipment from burning out or causing safety hazards due to abnormal overheating of the solenoid valve.

[0009] Preferably, both the connecting plate and the mounting plate are made of transparent material.

[0010] By adopting the above technical solution, when the temperature-sensitive paint layer changes color, the staff can quickly detect the change in the temperature-sensitive paint layer through the connecting plate and the mounting plate.

[0011] Preferably, the size of the fixing plate is smaller than the size of the connecting plate and the mounting plate.

[0012] By adopting the above technical solution, when the temperature-sensitive paint layer changes color, the fixing plate will not completely cover the connecting plate and the mounting plate, making it easier for staff to detect the change in time.

[0013] Preferably, the top of the slide plate has multiple insertion holes, a mounting sleeve is fixedly connected to one side of the fixing plate, and a plug rod for cooperating with the insertion holes is slidably connected to the inner side of the mounting sleeve.

[0014] By adopting the above technical solution, after the connecting plate and the mounting plate are moved to the designated position, the staff can insert the plug into the corresponding plug hole to position the sliding plate, connecting plate and mounting plate, and prevent the sliding plate, connecting plate and mounting plate from moving at will.

[0015] Preferably, a pull plate is fixedly connected to the top end of the insertion rod, and the size of the pull plate is larger than the size of the top end of the insertion rod.

[0016] By adopting the above technical solution, it is convenient for staff to pull the pull plate to drive the insertion rod to move upward and release the positioning of the slide plate, thereby making it convenient for staff to move the installation plate and the connecting plate.

[0017] Preferably, an installation ring is fixedly sleeved on the outer side of the insertion rod, and a first spring is fixedly connected to the top of the installation ring, with the top of the first spring fixedly connected to the bottom of the installation sleeve.

[0018] By adopting the above technical solution, when the staff pulls the insertion rod to move upward, it will cause the mounting ring to squeeze the first spring, resulting in greater resistance to the upward movement of the insertion rod. Therefore, when releasing the positioning of the slide plate, the staff needs to use a certain amount of force to prevent the insertion rod from moving out of the insertion hole at will.

[0019] Preferably, the connecting plate has a slot on the side near the mounting plate, and the mounting plate has a plug plate fixedly connected to the side near the connecting plate, with the plug plate slidably connected in the slot.

[0020] By adopting the above technical solution, when the temperature-sensitive paint layer is damaged, the staff can move the insert plate out of the slot, thereby removing and replacing the mounting plate and the temperature-sensitive paint layer, improving the convenience of use.

[0021] Preferably, a main valve port is provided on the inner side of the valve body, and a gas distribution plate is installed at the main valve port. A diaphragm assembly is provided on the top of the gas distribution plate. The diaphragm assembly includes a rivet, a rivet copper gasket, a diaphragm body, and a stainless steel plate. The rivet copper gasket, the diaphragm body, and the stainless steel plate are riveted together by the rivet. The stainless steel plate is elastically connected to the valve body by a second spring. A diaphragm balance hole is provided through one side of the top of the diaphragm body.

[0022] By adopting the above technical solution, the top layer is a large stainless steel plate, the middle core is the diaphragm body, and the bottom layer is a riveted copper gasket. The penetrating element is a rivet. The three layers of the large stainless steel plate, the diaphragm body, and the riveted copper gasket are firmly pressed together by the rivet to form an inseparable whole component. The diaphragm body itself is soft, and the large stainless steel plate allows the diaphragm body to move up and down evenly, rather than twisting randomly.

[0023] Preferably, the valve body has a pilot flow channel inside, a steel ball support net is fixedly connected to the inside of the pilot flow channel, a one-way steel ball is provided on the top of the steel ball support net, a steel ball seat is provided on the outside of the one-way steel ball, the steel ball seat is sealed and installed inside the valve body by a sealing gasket, a pilot small valve port is provided inside the valve body, and the pilot small valve port is connected to the pilot flow channel, a moving iron is provided on the top of the pilot small valve port, and an electromagnetic coil for cooperating with the moving iron is installed inside the valve body.

[0024] By adopting the above technical solution, in the forward direction: when the valve is closed, the medium enters the valve body inlet cavity at the lower end of the high-pressure medium diaphragm body through the balance hole on the diaphragm body, and the medium enters the upper end of the diaphragm body, so that the pressure at the upper and lower ends of the diaphragm body is balanced and the pressure difference is zero. The diaphragm body and the stainless steel plate open and close the main valve port under the action of the second spring, cutting off the main flow channel; when opening, the electromagnetic coil is energized, attracting the moving iron, opening the pilot small valve port, connecting the pilot flow channel, and the one-way steel ball leaves the plug under the action of gravity and falls on the steel ball support net. The pilot flow channel is connected to the valve outlet cavity, and the high-pressure medium at the upper end of the diaphragm body flows out through the pilot flow channel, so that an upward pressure difference is formed between the upper and lower ends of the diaphragm body, which overcomes the pressure of the second spring. The pressure difference lifts the diaphragm body upwards, connecting the main flow channel of the inlet cavity and the outlet cavity of the main valve port, so that the high-pressure medium flows out from the valve outlet end through the main flow channel from the valve inlet end.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] 1. By setting an indicator mechanism, when the valve body overheats abnormally and reaches a certain temperature value, the staff can intuitively and quickly judge that the valve body has malfunctioned, which facilitates the staff to repair the solenoid valve and prevents the equipment from burning out or causing safety hazards due to abnormal overheating of the solenoid valve.

[0027] 2. By setting up mounting sleeves, insert rods, and sockets, once the connecting plate and mounting plate are moved to the designated position, the operator can insert the insert rod into the corresponding socket to position the slide plate, connecting plate, and mounting plate, preventing them from moving arbitrarily.

[0028] 3. By setting up insert plates and slots, when the temperature-sensitive paint layer is damaged, the staff can move the insert plate out of the slot, thereby removing and replacing the mounting plate and the temperature-sensitive paint layer, improving the convenience of use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model;

[0030] Figure 2 This is a first-view schematic diagram of the indicating mechanism of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0031] Figure 3 This is a second-view schematic diagram of the indicating mechanism of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0032] Figure 4 This is a schematic diagram of the connection structure between the mounting sleeve and the insertion rod of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0033] Figure 5 This is an enlarged schematic diagram of the structure of region A of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0034] Figure 6 This is a schematic diagram showing the disassembled structure of the stainless steel plate and diaphragm body of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0035] Figure 7 This is a schematic diagram showing the disassembled structure of the one-way steel ball and the steel ball seat of the medium-sized SSV self-protecting diaphragm solenoid valve proposed in this utility model.

[0036] In the diagram: 1. Valve body; 2. Pipe body; 3. Indicating mechanism; 31. Support plate; 32. Fixing plate; 33. Slide plate; 34. Connecting plate; 35. Mounting plate; 36. Temperature-sensitive paint layer; 37. Mounting sleeve; 38. Insert rod; 39. Pull plate; 4. Mounting ring; 5. First spring; 6. Insert plate; 7. Main valve port; 8. Diaphragm assembly; 9. Rivet; 10. Riveted copper gasket; 11. Diaphragm body; 12. Stainless steel plate; 13. Second spring; 14. Diaphragm balance orifice; 15. Moving iron; 16. Pilot flow channel; 17. Steel ball support net; 18. One-way steel ball; 19. Steel ball seat sleeve; 20. Washer; 21. Gas distribution plate; 22. Electromagnetic coil; 23. Pilot valve port. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0038] Reference Figure 1 and Figure 2 A medium-sized SSV self-protecting diaphragm solenoid valve includes a valve body 1, with pipes 2 fixedly connected to both sides of the valve body 1, and an indicator mechanism 3 provided on one side of the valve body 1.

[0039] The indicating mechanism 3 includes a support plate 31, which is fixedly connected to one side of the valve body 1. A fixing plate 32 is fixedly connected to the top side of the support plate 31. A slot is opened through one side of the fixing plate 32, and a sliding plate 33 is slidably connected in the slot. A connecting plate 34 is fixedly connected to one side of the sliding plate 33. An installation plate 35 is provided on one side of the connecting plate 34. A temperature-sensitive paint layer 36 is coated on the side of the installation plate 35 away from the connecting plate 34. The specific raw materials and proportions of the temperature-sensitive paint layer 36 can be referred to the raw materials and proportions of model WS1610. This allows the operator to quickly detect when the solenoid valve heats up to more than 60 degrees Celsius, thus facilitating the operator to quickly repair the valve body 1 and prevent damage to the valve body 1.

[0040] Furthermore, refer to Figure 2 and Figure 3 It can be determined that the temperature sensing values ​​of the temperature-sensitive paint layer 36 are 35 degrees Celsius, 40 degrees Celsius, and 60 degrees Celsius. Therefore, the temperature-sensitive paint will show the first color at 35 degrees Celsius, the second color in the 40-degree Celsius range, and the third color at 60 degrees Celsius. 35 degrees Celsius and 40 degrees Celsius are within the normal state of the solenoid valve. When the temperature-sensitive paint layer 36 shows the third color, it indicates that the temperature of the solenoid valve exceeds 60 degrees Celsius, which is an abnormally hot state. The staff can cut off the power supply first to avoid burning out the equipment or causing safety hazards.

[0041] Furthermore, refer to Figure 2 and Figure 3 It can be seen that both the connecting plate 34 and the mounting plate 35 are made of transparent material, so that staff can promptly detect when the temperature-sensitive paint layer 36 changes color.

[0042] Furthermore, refer to Figure 2 and Figure 4 It can be seen that the size of the fixing plate 32 is smaller than that of the connecting plate 34 and the mounting plate 35, so that the fixing plate 32 will not obstruct the connecting plate 34 and the mounting plate 35, making it convenient for staff to observe.

[0043] Furthermore, refer to Figure 2and Figure 4 It can be seen that a push plate is fixedly connected to the side of the skateboard 33 away from the connecting plate 34, which makes it convenient for staff to push and pull the skateboard 33.

[0044] Furthermore, refer to Figure 2 and Figure 4 It can be seen that the top of the skateboard 33 has multiple insertion holes, and the mounting sleeve 37 is fixedly connected to one side of the fixing plate 32. The inner side of the mounting sleeve 37 is slidably connected to the insertion rod 38 for cooperating with the insertion holes, so as to facilitate the positioning of the skateboard 33 and prevent the skateboard 33 from moving at will.

[0045] Furthermore, refer to Figure 2 and Figure 4 It can be seen that a pull plate 39 is fixedly connected to the top of the insertion rod 38. The size of the pull plate 39 is larger than the size of the top of the insertion rod 38, so that the staff can pull the pull plate 39 to move the insertion rod 38.

[0046] Furthermore, refer to Figure 2 and Figure 4 It can be seen that the outer side of the insertion rod 38 is fixedly fitted with an installation ring 4, and the top of the installation ring 4 is fixedly connected with a first spring 5. The top of the first spring 5 is fixedly connected with the bottom of the installation sleeve 37, so as to prevent the insertion rod 38 from moving at will.

[0047] Furthermore, refer to Figure 2 and Figure 4 It can be seen that the connecting plate 34 has a slot on the side near the mounting plate 35, and the mounting plate 35 is fixedly connected to the insert plate 6 on the side near the connecting plate 34. The insert plate 6 is slidably connected in the slot, which makes it convenient for staff to quickly remove the mounting plate 35 and the temperature-sensitive paint layer 36 for replacement.

[0048] Furthermore, refer to Figure 2 and Figure 4 It can be seen that both the slot and the insert plate 6 have a T-shaped cross section, which helps to prevent the insert plate 6 from falling out of the slot at will.

[0049] Furthermore, refer to Figures 5-7 It can be seen that a main valve port 7 is opened on the inner side of the valve body 1, and a gas distribution plate 21 is installed at the main valve port 7. A diaphragm assembly 8 is provided on the top of the gas distribution plate 21. The diaphragm assembly 8 includes a rivet 9, a rivet copper gasket 10, a diaphragm body 11 and a stainless steel plate 12. The rivet copper gasket 10, the diaphragm body 11 and the stainless steel plate 12 are riveted together by the rivet 9. The stainless steel plate 12 is elastically connected to the valve body 1 by the second spring 13. A diaphragm balance hole 14 is opened through one side of the top of the diaphragm body 11.

[0050] A pilot flow channel 16 is provided on the inner side of the valve body 1. A steel ball support net 17 is fixedly connected to the inner side of the pilot flow channel 16. A one-way steel ball 18 is provided on the top of the steel ball support net 17. A steel ball seat 19 is provided on the outer side of the one-way steel ball 18. The steel ball seat 19 is sealed and installed on the inner side of the valve body 1 by a sealing gasket 20. A pilot small valve port 23 is provided on the inner side of the valve body 1, and the pilot small valve port 23 is connected to the pilot flow channel 16. A moving iron 15 is provided on the top of the pilot small valve port 23. An electromagnetic coil 22 for cooperating with the moving iron 15 is installed on the inner side of the valve body 1. The electromagnetic coil 22 is existing technology and will not be described in detail here.

[0051] In the forward direction: When the valve is closed, the medium enters the valve body 1 at the lower end of the high-pressure medium diaphragm body 11 through the diaphragm balance hole 14 on the diaphragm body 11, balancing the pressure at the upper and lower ends of the diaphragm body 11, resulting in a pressure difference of "0". Under the action of the second spring 13, the diaphragm body 11 and the stainless steel plate 12 open and close the main valve port 7, cutting off the main flow path. When opening, the electromagnetic coil 22 is energized, attracting the moving iron 15 and opening the pilot small valve port 23. When the pilot flow channel 16 is connected, the one-way steel ball 18 leaves the plug under the action of gravity and falls on the steel ball support net 17. The pilot flow channel 16 is connected to the valve outlet cavity. The high pressure medium at the upper end of the diaphragm body 11 flows out through the pilot flow channel 16, so that an upward pressure difference is formed between the upper and lower parts of the diaphragm body 11, which overcomes the pressure of the second spring 13. The pressure difference lifts the diaphragm body 11 upward, connecting the main flow channel of the inlet cavity and the outlet cavity to the main valve port 7, so that the high pressure medium flows out from the valve inlet end through the main flow channel from the valve outlet end.

[0052] When the inlet pressure P is greater than the outlet pressure, and the outlet pressure momentarily becomes greater than the inlet pressure, the medium flows from high pressure to low pressure. The backflow of the medium lifts the one-way steel ball 18, which moves upward within the pilot channel 16. This causes the one-way steel ball 18 to close the inlet above the pilot channel 16, cutting off the pilot channel 16 and preventing the high-pressure medium from entering the upper cavity of the diaphragm body 11. This avoids the diaphragm body 11 being deformed and wrinkled by the high-pressure medium pressing it against the gas distribution plate 21. At this time, the reverse high-pressure medium P can only lift the diaphragm body 11 upward in the lower cavity of the outlet of the diaphragm body 11 in the main channel, overcoming the restoring force of the second spring 13 of the diaphragm (Preverse>Ppositive, 0.002MPa), causing the diaphragm body 11 to float up and connect the main channel of the valve. The high-pressure medium flows out of the valve body 1 through the valve inlet channel, thus protecting the diaphragm body 11 at the main valve port 7.

[0053] Conversely, when the pressure at the valve outlet decreases, causing Ppositive > Preverse, the one-way steel ball 18 falls back onto the feed net under the force of gravity, connecting the pilot flow channel 16 and restoring the valve's original performance.

[0054] In this utility model, when the valve body 1 is working, the operator can insert the insert plate 6 into the slot so that the mounting plate 35 is connected to the connecting plate 34. At this time, the operator can pull the pull plate 39 to drive the insert rod 38 to rise and move. The rising and moving of the insert rod 38 can drive the mounting ring 4 to rise and move to squeeze the first spring 5 until the insert rod 38 moves out from one of the insertion holes, releasing the positioning of the mounting plate 35.

[0055] Then, the staff can push the push plate away from the support plate 31 to move the slide plate 33. The movement of the slide plate 33 can move the connecting plate 34 towards the valve body 1. The movement of the connecting plate 34 can move the insert plate 6 and the mounting plate 35, so that the temperature-sensitive paint layer 36 on one side of the mounting plate 35 comes into contact with the valve body 1.

[0056] Next, the staff can release the pull plate 39, causing the squeezed first spring 5 to rebound, which will drive the mounting ring 4 and the insertion rod 38 to move down quickly until the insertion rod 38 is quickly inserted into another insertion hole, positioning the slide plate 33 so that the slide plate 33, the connecting plate 34 and the mounting plate 35 will not move randomly.

[0057] Finally, when the valve body 1 reaches a stable temperature of 35 degrees Celsius, the temperature-sensitive paint layer 36 changes to the first color. When the temperature of the valve body 1 reaches 40 degrees Celsius, the temperature-sensitive paint layer 36 changes to the second color. When the temperature of the valve body 1 reaches 60 degrees Celsius, the temperature-sensitive paint layer 36 changes to the third color. This allows the staff to quickly determine whether the valve body 1 is overheating abnormally, making it convenient for the staff to repair the solenoid valve in a timely manner.

[0058] In this utility model, the installation, connection or setting methods of all the components mentioned above are common mechanical methods, and the specific structure, model and coefficient index of all the components are their own technologies, which can be implemented by "those skilled in the art". As long as the beneficial effect can be achieved, it can be implemented, so it will not be elaborated further.

[0059] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0060] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are only used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A medium-sized SSV self-protecting diaphragm solenoid valve, comprising a valve body (1), characterized in that, The valve body (1) is fixedly connected to pipes (2) on both sides, and an indicator mechanism (3) is provided on one side of the valve body (1); The indicating mechanism (3) includes a support plate (31), which is fixedly connected to one side of the valve body (1). A fixing plate (32) is fixedly connected to one side of the top of the support plate (31). A slot is opened through one side of the fixing plate (32), and a sliding plate (33) is slidably connected in the slot. A connecting plate (34) is fixedly connected to one side of the sliding plate (33). An mounting plate (35) is provided on one side of the connecting plate (34), and a temperature-sensitive paint layer (36) is applied to the side of the mounting plate (35) away from the connecting plate (34).

2. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 1, characterized in that, Both the connecting plate (34) and the mounting plate (35) are made of transparent material.

3. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 2, characterized in that, The size of the fixing plate (32) is smaller than that of the connecting plate (34) and the mounting plate (35).

4. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 3, characterized in that, The top of the slide plate (33) has multiple insertion holes, and a mounting sleeve (37) is fixedly connected to one side of the fixing plate (32). A plug rod (38) for cooperating with the insertion holes is slidably connected inside the mounting sleeve (37).

5. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 4, characterized in that, A pull plate (39) is fixedly connected to the top of the insertion rod (38), and the size of the pull plate (39) is larger than the size of the top of the insertion rod (38).

6. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 5, characterized in that, An installation ring (4) is fixedly sleeved on the outside of the insertion rod (38). A first spring (5) is fixedly connected to the top of the installation ring (4). The top of the first spring (5) is fixedly connected to the bottom of the installation sleeve (37).

7. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 1, characterized in that, The connecting plate (34) has a slot on the side near the mounting plate (35), and the mounting plate (35) is fixedly connected to the side near the connecting plate (34), and the insert plate (6) is slidably connected in the slot.

8. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 1, characterized in that, The valve body (1) has a main valve port (7) on its inner side. A gas distribution plate (21) is installed at the main valve port (7). A diaphragm assembly (8) is provided on the top of the gas distribution plate (21). The diaphragm assembly (8) includes a rivet (9), a rivet copper gasket (10), a diaphragm body (11), and a stainless steel plate (12). The rivet copper gasket (10), the diaphragm body (11), and the stainless steel plate (12) are riveted together by the rivet (9). The stainless steel plate (12) is elastically connected to the valve body (1) by a second spring (13). A diaphragm balance hole (14) is provided through one side of the top of the diaphragm body (11).

9. The medium-sized SSV self-protecting diaphragm solenoid valve according to claim 8, characterized in that, The valve body (1) has a pilot flow channel (16) on its inner side. A steel ball support net (17) is fixedly connected to the inner side of the pilot flow channel (16). A one-way steel ball (18) is provided on the top of the steel ball support net (17). A steel ball seat (19) is provided on the outer side of the one-way steel ball (18). The steel ball seat (19) is sealed and installed on the inner side of the valve body (1) by a sealing gasket (20). A pilot small valve port (23) is provided on the inner side of the valve body (1), and the pilot small valve port (23) is connected to the pilot flow channel (16). A moving iron (15) is provided on the top of the pilot small valve port (23). An electromagnetic coil (22) for cooperating with the moving iron (15) is installed on the inner side of the valve body (1).

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