Slow flow pressure regulating valve

Abstract

The invention belongs to the technical field of factory automatic control, and particularly relates to a slow flow pressure regulating valve. The pressure relief valve comprises a valve shell, a valve rod, a pressure relief channel, a flow slowing plate and an electromagnetic plate, an inlet is formed in the right side of a cylindrical section of the valve shell, an outlet is formed in the left side of the cylindrical section, the pressure relief channel is installed at the bottom of the cylindrical section, and the valve rod is inserted into the cylindrical section from the top of the valve shell to divide the interior of the valve shell into an inlet cavity and an outlet cavity; the valve shell and the valve rod are sealed and fixed through a fluororubber gasket; a flow slowing plate is arranged outside a rod body, located in the cylindrical section, of the valve rod, a fluororubber gasket is arranged between the flow slowing plate and the rod body, the outer side of the upper end of the valve rod is sleeved with a spring, and the bottom of the spring is fixed to the valve shell in a welded mode. The valve rod and the spring are isolated in a cast iron welding mode. The top of the valve rod is provided with an electromagnetic plate. The pipeline pressure control device is used for stably controlling the pipeline pressure during online instrument verification and protecting a main process pipeline to a certain extent.

Description

Technical Field

[0001] The invention belongs to the technical field of factory automatic control, and in particular relates to a slow-flow pressure regulating valve. Background Art

[0002] A factory adopts a closed-loop production mode, and the materials in the pipeline are in an absolute pressure environment. When conducting online calibration of pipeline instruments, it is necessary to cut off the pressure-supply pipeline, material flow, and pressure adjustment. However, manual control valves are currently mainly used for opening adjustment and pipeline cutoff operations, which causes problems such as unstable pipeline pressure control and material blockage. In order to reduce manual operations and further improve the stability of pressure control, a slow-flow pressure regulating valve was designed and developed to steadily control pipeline pressure during online instrument calibration and provide certain protection for the main process pipeline. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a slow-flow pressure regulating valve, which is used to stably control the pipeline pressure during online instrument calibration and to provide certain protection for the main process pipeline.

[0004] The technical solution adopted by the present invention is:

[0005] A slow-flow pressure regulating valve comprises a valve housing, a valve stem, a pressure relief channel, a slow-flow plate and an electromagnetic plate. The right side of the cylindrical section of the valve housing is an inlet, and the left side is an outlet. A pressure relief channel is installed at the bottom of the cylindrical section. The valve stem is inserted into the interior of the cylindrical section from the top of the valve housing, and the interior of the valve housing is divided into an inlet cavity and an outlet cavity. A fluororubber gasket is used to seal and fix the valve housing and the valve stem. A slow-flow plate is provided outside the stem body of the valve stem located inside the cylindrical section, and a fluororubber gasket is provided between the slow-flow plate and the stem body. A spring is sleeved on the outer side of the upper end of the valve stem, and the bottom of the spring is fixed to the valve housing by welding. The valve stem and the spring are isolated by cast iron welding. An electromagnetic plate is installed on the top of the valve stem.

[0006] The inlet is installed with a KF16 outlet valve by welding, and the outlet is installed with a KF16 outlet valve by welding. The material of the KF16 outlet valve is 316L.

[0007] The pressure relief channel is provided with a pressure relief inlet switch near the inlet end, and a pressure relief outlet switch near the outlet end.

[0008] A pressure regulator is passed through the top of the valve housing on one side close to the inlet, a slow flow cavity is formed between the pressure regulator and the valve stem, and the top of the pressure regulator is connected to a motor located outside the valve housing.

[0009] The valve housing upper cover is provided with a pressure transmitter pressure lead pipe, in which a slow flow chamber pressure transmitter is arranged, and the slow flow chamber pressure transmitter is connected with the slow flow chamber. Pressure transmitter pressure lead pipes are respectively provided at the upper left corner and the upper right corner of the cylindrical section of the valve housing, in which an outlet chamber pressure transmitter and an inlet chamber pressure transmitter are respectively arranged, and the outlet chamber pressure transmitter is connected with the outlet chamber, and the inlet chamber pressure transmitter is connected with the inlet chamber.

[0010] The slow flow plate is respectively provided with a slow flow plate outlet and a slow flow plate inlet, and the lower end of the rod body is provided with an inclined slow flow channel, the slow flow plate inlet is located on one side of the inlet, and the slow flow plate outlet is located on one side of the outlet, the position of the slow flow plate inlet is higher than the slow flow plate outlet, the inclination direction of the slow flow channel is inclined from the direction of the slow flow plate inlet to the direction of the slow flow plate outlet, and the position of the slow flow plate outlet is higher than the highest position of the slow flow channel.

[0011] An electromagnet is fixed on the electromagnetic plate and the spring by welding; the electromagnetic plate is connected to the valve housing on the outside of the spring by a slot, and the electromagnetic plate drives the spring and the valve stem to slide freely; when the electromagnet at the top is energized, it acquires magnetism, attracts the lower electromagnetic plate, the valve stem and the spring together, and maintains a closed state, at this time, the slow flow channel at the bottom of the valve stem is connected with the inlet and outlet of the slow flow plate, and the fluid inside the valve circulates.

[0012] The slow flow channel is set with a DN15 round hole at the bottom of the valve stem to ensure that the valve stem moves to the highest position, can connect the inlet and outlet positions of the slow flow plate, and finally conduct the entire valve cavity.

[0013] The voltage regulator includes a flow switch plate, a flow bottom plate, an adjustment shaft, and a motor gear. The flow switch plate and the flow bottom plate are overlapped with the adjustment shaft as the center, wherein the flow bottom plate is located on the left side, and a cross-shaped adjustment shaft is fixed on the center thereof by welding, and protrudes to the right side by a certain length; a cross hollow design is performed at the center of the flow switch plate corresponding to the position of the adjustment shaft, so as to provide support when the flow switch plate and the flow bottom plate are overlapped with the adjustment shaft as the center, and enable the flow switch plate to have the ability to rotate 360° around the flow bottom plate; the motor gear of the motor is tightly fitted with the switch plate gear distributed on the edge of the flow switch plate.

[0014] When the motor rotates, it drives the flow switch plate to make circular motion around the adjusting shaft, so that the four flow switches of different sizes on the flow switch plate coincide with the bottom plate pressure regulating holes on the right side of the flow bottom plate, thereby achieving the purpose of controlling the flow size passing through the flow switch plate and the flow bottom plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) A slow-flow pressure regulating valve provided by the present invention has a slow-flow plate and a pressure regulating plate arranged inside the valve body, dividing the internal space of the valve body into three independent chambers;

[0017] (2) A slow-flow pressure regulating valve provided by the present invention has three cavities inside the valve body provided with independent pressure transmitters, which are associated with the pressure regulating plate and the slow-flow plate switch of the cavity;

[0018] (3) A slow-flow pressure regulating valve provided by the present invention is provided with a discharge channel for bypassing a large flow of materials under abnormal conditions;

[0019] (4) The slow-flow pressure regulating valve provided by the present invention has a bottom plate pressure regulating hole, a flow bottom plate, and a flow switch, and the motor drives the gear to rotate to control the size of the flow switch and adjust the flow of the material;

[0020] (5) The present invention provides a slow-flow pressure regulating valve, in which a fluororubber gasket is punched between the valve stem and the valve housing to ensure sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a slow-flow pressure regulating valve provided by the present invention;

[0022] Figure 2 This is a breakdown diagram of the voltage regulator structure;

[0023] Figure 3 Front view of the voltage regulator structure

[0024] Among them, 1-valve housing; 2-outlet; 3-pressure relief outlet switch; 4-outlet chamber pressure transmitter; 5-spring; 6-motor; 7-slow flow chamber pressure transmitter; 8-inlet chamber pressure transmitter; 9-inlet; 10-pressure relief channel; 11-pressure relief inlet switch; 12-electromagnet; 13-valve stem; 14-fluororubber gasket; 15-fluororubber gasket; 16-slow flow plate; 17-slow flow plate outlet; 18-slow flow channel; 19-slow flow plate inlet; 20-pressure regulator; 21-electromagnetic plate; 22-outlet chamber; 23-slow flow chamber; 24-inlet chamber; 25-flow switch plate; 26-flow bottom plate; 27-adjusting shaft; 28-fluororubber gasket; 29-bottom plate pressure regulating hole; 30-flow switch; 31-switch plate gear; 32-motor gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1 As shown, a slow-flow pressure regulating valve provided by the present invention comprises a valve housing 1, a valve stem 13, a pressure relief channel 10, a slow-flow plate 16, and an electromagnetic plate 21.

[0029] The valve housing 1 is mainly made of cast iron and is installed in a right-in and left-out manner. The right side of the cylindrical section of the valve housing 1 is the inlet 9, and the left side is the outlet 2. The outlet 2 and the inlet 9 are made of 316L and welded to the left and right sides of the valve housing 1, and are designed in a KF16 quick connection manner. The inlet 9 is welded with a KF16 outlet valve, and the left side is the outlet 2. The outlet 2 is welded with a KF16 outlet valve, and the material of the KF16 outlet valve is 316L. A pressure relief channel 10 made of 316L is installed at the bottom of the cylindrical section. The channel is DN20 and 20CM long. The pressure relief channel 10 is connected to the valve housing 1 by welding. A pressure relief inlet switch 11 is provided on the pressure relief channel 10 near the inlet 9 end, and a pressure relief outlet switch 3 is provided near the outlet 2 end. The valve stem 13 is inserted into the interior of the cylindrical section from the top of the valve housing 1, and the interior of the valve housing 1 is divided into an inlet cavity 24 and an outlet cavity 22. The valve housing 1 is penetrated from the top on the side near the inlet 9. A slow flow cavity 23 is formed between the pressure regulator 20 and the valve stem 13. The top of the pressure regulator 20 is connected to the motor 6 located outside the valve housing 1. A fluororubber gasket 14 is used to seal and fix the valve housing 1 and the valve stem 13.

[0030] The upper cover of the valve housing 1 is provided with a pressure transmitter lead pipe, and a slow flow chamber pressure transmitter 7 is provided in the pressure transmitter lead pipe, and the slow flow chamber pressure transmitter 7 is communicated with the slow flow chamber 23. Pressure transmitter lead pipes are respectively provided at the upper left corner and the upper right corner of the cylindrical section of the valve housing 1, and an outlet chamber pressure transmitter 4 and an inlet chamber pressure transmitter 8 are respectively provided in the pressure transmitter lead pipe, and the outlet chamber pressure transmitter 4 is communicated with the outlet chamber 22, and the inlet chamber pressure transmitter 8 is communicated with the inlet chamber 24;

[0031] The valve stem 13 is provided with a slow flow plate 16 outside the rod body located inside the cylindrical section, and a fluororubber gasket 15 is provided between the slow flow plate 16 and the rod body, and the slow flow plate 16 is respectively provided with a slow flow plate outlet 17 and a slow flow plate inlet 19, and the lower end of the rod body is provided with an inclined slow flow channel 18, the slow flow plate inlet 19 is located on one side of the inlet 9, and the slow flow plate outlet 17 is located on one side of the outlet 2, the position of the slow flow plate inlet 19 is higher than the slow flow plate outlet 17, and the inclination direction of the slow flow channel 18 is inclined from the direction of the slow flow plate inlet 19 to the direction of the slow flow plate outlet 17, and the position of the slow flow plate outlet 17 is higher than the highest position of the slow flow channel 18;

[0032] A fluororubber gasket 14 is provided at the connection between the valve stem 13 and the top of the valve housing 1 to ensure sealing; a spring 5 is sleeved on the outer side of the upper end of the valve stem 13, and the bottom of the spring 5 is fixed to the valve housing 1 by welding; the valve stem 13 and the spring 5 are isolated by cast iron welding; an electromagnetic plate 21 is installed on the top of the valve stem 13. The top electromagnetic switch is composed of the electromagnet 12, the spring 5, the valve stem 13, the electromagnetic plate 21, and the gasket. The electromagnetic plate 21 is fixed on the top of the valve stem 13 by welding. An electromagnet 12 is fixed on the electromagnetic plate 21 and the spring 5 by welding; the electromagnetic plate 21 is connected to the valve housing 1 outside the spring 5 by a slot, and the electromagnetic plate 21 can drive the spring 5 and the valve stem 13 to slide freely; when the electromagnet 12 at the top is energized, it obtains magnetism, attracts the lower electromagnetic plate 21, the valve stem 13, and the spring 5 together, and maintains a closed state, at this time, the slow flow channel 18 at the bottom of the valve stem 13 is connected with the slow flow plate 16 inlet and the slow flow plate outlet 17, and the fluid inside the valve circulates;

[0033] The slow flow channel 18 is provided with a DN15 circular hole at the bottom of the valve stem 13 to ensure that the valve stem 13 moves to the highest position, can connect the inlet and outlet positions of the slow flow plate 16, and finally conduct the entire valve cavity.

[0034] The slow flow plate 16 is fixed to the inner housing of the valve by welding; its inlet is opened at the right side of the slow flow plate 16, near the top one-third position;

[0035] The slow flow plate outlet 17 is opened on the left side of the slow flow plate 16, close to the bottom one third position;

[0036] like Figure 2 , 3 As shown, the present invention provides a voltage regulator structure, which is Figure 1 The middle pressure regulator 20 includes a flow switch plate 25, a flow bottom plate 26, an adjustment shaft 27, and a motor gear 32.

[0037] Figure 2 The structure of the components of the voltage regulator after being disassembled. When working normally, the flow switch plate 25 and the flow bottom plate 26 are placed overlappingly with the adjustment shaft 27 as the center, wherein the flow bottom plate 26 is located on the left side, and the cross-shaped adjustment shaft 27 is fixed by welding at the center thereof, and protrudes to the right by a certain length. Furthermore, the protruding part on the right side of the cross adjustment shaft can rotate 360°. On the other hand, a cross hollow design is made at the center of the flow switch plate 25 corresponding to the position of the adjustment shaft 27, so as to provide support when the flow switch plate 25 and the flow bottom plate 26 are placed overlappingly with the adjustment shaft 27 as the center, and enable the flow switch plate 25 to have the ability to rotate 360° around the flow bottom plate 26. Furthermore, in Figure 1 A motor 6 is arranged in the middle, and the motor gear is closely fitted with the switch plate gear 31 distributed on the edge of the flow switch plate 25. When the motor rotates, it drives the flow switch plate 25 to make a circular motion around the adjustment shaft 27, so that the four flow switches 30 of different sizes on the flow switch plate 25 overlap with the bottom plate pressure regulating hole 29 located on the right side of the flow bottom plate 26, so as to achieve the purpose of controlling the flow size through the flow switch plate 25 and the flow bottom plate 26.

[0038] The flow bottom plate 26 is made of 316L material and is fixed to the valve inner cavity housing by welding. Figure 1 On the right side of the slow flow cavity 23. In the middle of the flow bottom plate 26, an outward convex cross adjustment shaft 27 is set by welding to fix the flow switch plate 25; on the right side of the flow bottom plate 26, a 20mm circular hole is opened to conduct the flow; in the form of stamping connection, the entire flow bottom plate 26 is covered and a layer of fluororubber gasket 28 is installed to increase the sealing performance between the bottom plate pressure regulating hole 29 in the flow bottom plate 26 and the flow switch 30 of the flow switch plate 25.

[0039] The flow switch plate 25 is made of 316L material and is set as a disc. The center is designed in a concave cross shape, which is used to snap the adjustment shaft 27 of the flow bottom plate 26; the flow switch plate 25 is provided with flow switches 30 in the form of holes around it, and the holes are 5mm, 10mm, 15mm, and 20mm respectively; the flow switch plate 25 is provided with switch plate gears 31 around the outside, and the total number of steps per rotation is 1000;

[0040] The switch plate gear 31 in the flow switch plate 25 is connected to the motor gear 32 on the right side of the valve housing 1 by a snap connection. The rotation of the motor drives the flow switch plate 25 to rotate, thereby adjusting the closed aperture of the flow switch plate 25 and the flow bottom plate 26 to adjust the flow.

[0041] The working principle of the present invention is:

[0042] The valve body is constructed of cast iron, and the inside of the valve body is divided into three cavities by the slow flow plate and the pressure regulator: the inlet cavity, the slow flow cavity, and the outlet cavity. The pressure regulator consists of a flow bottom plate, a flow switch, and a pressure regulating hole. The flow through the pressure regulator is controlled by adjusting different pressure regulating holes. The position of the valve stem is adjusted to connect the outlet and inlet of the slow flow plate and the slow flow channel on the valve stem, and the flow is further adjusted. Pressure transmitters are set in the three cavities to detect the parameter control situation. A pressure relief channel is set at the bottom of the valve body for protective pressure relief when the parameters of the cavity in the valve are out of control, and the electromagnetic switch is used as its control switch. An electromagnetic switch is set at the top of the valve stem. When energized, the valve stem moves upward to control the connection of the slow flow channel.

[0043] Valve flow direction: left out and right in, with 1 outlet 2 on the left and 1 inlet on the right; the entire valve is sealed with cast iron as the shell, and electromagnetic switches are set at the top, left side and right side of the valve, and the size of the bottom electromagnetic switch is half of the top one. The top electromagnetic switch has the same structure as the two bottom electromagnetic switches, with only differences in size and position.

[0044] When the fluid enters from the right side of the valve, the inlet pressure transmitter 8 detects the pressure in the cavity to determine the required aperture of the pressure regulator 20, and the stepper motor 6 drives the gear to operate to adjust the amount of fluid entering the slow flow cavity 23. The slow flow cavity 23 and the outlet pressure transmitter 4 detect and compare the pressure difference before and after the slow flow plate 16 to determine whether the outlet cavity pressure needs to be adjusted. If adjustment is required, the electromagnetic switch power supply is disconnected to make the slow flow plate 16 in the cut-off state to ensure that the outlet cavity pressure is stable. When the inlet cavity 24, the slow flow cavity 23, and the outlet cavity pressure are all abnormal, it is determined that the valve pressure control fails. This is an abnormal working condition, and the pressure relief channel 10 needs to be opened for special treatment.

[0045] The pressure relief channel 10 is used to directly release the pressure in the inlet chamber 24 to the valve outlet chamber 22 when the pressure in the inlet chamber 24 exceeds the limit and cannot be relieved by the slow flow plate 16 and the pressure regulator 20. When it is detected that the pressure in the inlet chamber 24 exceeds the limit for a certain period of time, the pressure relief inlet switch 11 is first opened, and then the pressure relief outlet switch 3 is opened to quickly reduce the pressure in the inlet chamber 24.

[0046] After the electromagnetic switch, the pressure relief inlet switch 11, and the pressure relief outlet switch 3 are powered on, according to the electromagnetic principle, the electromagnet 12 acquires magnetism, thereby attracting the electromagnetic plate 21 to close and changing the valve state. When the power is turned off, the electromagnet 12 loses its magnetism, and since the spring 5 is connected under the electromagnetic plate 21, the electromagnet 12 is separated from the electromagnetic plate 21 by elastic force, thereby changing the position of the valve stem 13.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A slow flow pressure regulating valve, characterized in that: The invention comprises a valve housing (1), a valve stem (13), a pressure relief passage (10), a slow flow plate (16), and an electromagnetic plate (21). The right side of the cylindrical section of the valve housing (1) is an inlet (9), the left side is an outlet (2), a pressure relief passage (10) is installed at the bottom of the cylindrical section, the valve stem (13) is inserted into the inside of the cylindrical section from the top of the valve housing (1), and the inside of the valve housing (1) is divided into an inlet chamber (24) and an outlet chamber (22), and a fluororubber is used between the valve housing (1) and the valve stem (13). The valve stem (13) is sealed and fixed by a rubber gasket (14); a slow flow plate (16) is provided outside the stem body of the valve stem (13) located inside the cylindrical section, a fluororubber gasket (15) is provided between the slow flow plate (16) and the stem body, a spring (5) is sleeved on the outer side of the upper end of the valve stem (13), and the bottom of the spring (5) is fixed to the valve housing (1) by welding; the valve stem (13) and the spring (5) are isolated by cast iron welding; an electromagnetic plate (21) is installed on the top of the valve stem (13).

2. The slow-flow pressure regulating valve according to claim 1, characterized in that: The inlet (9) is installed with a KF16 outlet valve by welding, and the outlet (2) is installed with a KF16 outlet valve by welding. The material of the KF16 outlet valve is 316L.

3. The slow-flow pressure regulating valve according to claim 1, characterized in that: The pressure relief channel (10) is provided with a pressure relief inlet switch (11) near the inlet (9) end, and a pressure relief outlet switch (3) near the outlet (2) end.

4. The slow-flow pressure regulating valve according to claim 1, characterized in that: A pressure regulator (20) is passed through the top of the valve housing (1) on a side close to the inlet (9), a slow flow chamber (23) is formed between the pressure regulator (20) and the valve stem (13), and the top of the pressure regulator (20) is connected to a motor (6) located outside the valve housing (1).

5. The slow-flow pressure regulating valve according to claim 4, characterized in that: The upper cover of the valve housing (1) is provided with a pressure transmitter pressure pipe, and a slow flow chamber pressure transmitter (7) is arranged inside the pressure transmitter pressure pipe, and the slow flow chamber pressure transmitter (7) is connected to the slow flow chamber (23). Pressure transmitter pressure pipes are respectively installed at the upper left corner and the upper right corner of the cylindrical section of the valve housing (1), and an outlet chamber pressure transmitter (4) and an inlet chamber pressure transmitter (8) are respectively arranged inside the pressure transmitter pressure pipe, and the outlet chamber pressure transmitter (4) is connected to the outlet chamber (22), and the inlet chamber pressure transmitter (8) is connected to the inlet chamber (24).

6. The slow-flow pressure regulating valve according to claim 1, characterized in that: The slow flow plate (16) is respectively provided with a slow flow plate outlet (17) and a slow flow plate inlet (19); the lower end of the rod body is provided with an inclined slow flow channel (18); the slow flow plate inlet (19) is located on one side of the inlet (9); the slow flow plate outlet (17) is located on one side of the outlet (2); the position of the slow flow plate inlet (19) is higher than the slow flow plate outlet (17); the inclination direction of the slow flow channel (18) is from the direction of the slow flow plate inlet (19) to the direction of the slow flow plate outlet (17); and the position of the slow flow plate outlet (17) is higher than the highest position of the slow flow channel (18).

7. The slow-flow pressure regulating valve according to claim 6, characterized in that: An electromagnet (12) is fixed on the electromagnetic plate (21) and the spring (5) by welding; the electromagnetic plate (21) is connected to the valve housing (1) outside the spring (5) by a slot, and the electromagnetic plate (21) drives the spring (5) and the valve stem (13) to slide freely; when the electromagnet (12) located at the top is energized, it acquires magnetism, attracts the lower electromagnetic plate (21), the valve stem (13), and the spring (5) together, and maintains a closed state, at which time the slow flow channel (18) at the bottom of the valve stem (13) is connected to the slow flow plate (16) inlet and the slow flow plate outlet (17), and the fluid inside the valve circulates.

8. The slow-flow pressure regulating valve according to claim 7, characterized in that: The slow flow channel (18) is provided with a DN15 circular hole at the bottom of the valve stem (13) to ensure that the valve stem (13) moves to the highest position, can connect the inlet and outlet positions of the slow flow plate (16), and finally conduct the entire valve cavity.

9. The slow-flow pressure regulating valve according to claim 4, characterized in that: The pressure regulator (20) comprises a flow switch plate (25), a flow bottom plate (26), an adjustment shaft (27), and a motor gear (32). The flow switch plate (25) and the flow bottom plate (26) are placed in an overlapping manner with the adjustment shaft (27) as the center, wherein the flow bottom plate (26) is located on the left side, and a cross-shaped adjustment shaft (27) is fixed in the center thereof by welding, and protrudes to the right side by a certain length; a cross-shaped hollow design is made at the center of the flow switch plate (25) corresponding to the position of the adjustment shaft (27), so as to provide support when the flow switch plate (25) and the flow bottom plate (26) are placed in an overlapping manner with the adjustment shaft (27) as the center, and enable the flow switch plate (25) to have the ability to rotate 360 ​​degrees around the flow bottom plate (26); the motor gear of the motor (6) is tightly fitted with the switch plate gear (31) distributed on the edge of the flow switch plate (25).

10. The slow-flow pressure regulating valve according to claim 4, characterized in that: When the motor rotates, it drives the flow switch plate (25) to make a circular motion around the adjustment shaft (27), so that the four flow switches (30) of different sizes located on the flow switch plate (25) overlap with the bottom plate pressure regulating hole (29) located on the right side of the flow bottom plate (26), thereby achieving the purpose of controlling the flow size passing through the flow switch plate (25) and the flow bottom plate (26).

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