Pressure reducing valve with pressure relief device

Abstract

The utility model relates to the technical field of valves, in particular to a pressure reducing valve with a pressure relief device, which comprises a valve body, a valve body component, a valve front cavity and a valve rear cavity are arranged in the valve body, the valve front cavity is communicated with the valve rear cavity, the valve body component is arranged at the communicated position of the valve front cavity and the valve rear cavity, and the valve rear cavity is communicated with a pressure reducing guide valve and the pressure relief device. The pressure relief device is provided with a pressure relief opening communicated with the outside, and a detection device is further arranged on the valve body and connected with the pressure relief device. According to the utility model, automatic drainage and pressure relief can be realized when the pressure of the pipeline is too large, and data such as overpressure duration, overpressure frequency and overpressure generation time period can be automatically recorded by transmitting a signal to a pipe network control room through the detection switch.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field more particularly, relate to a pressure reducing valve with pressure relief device. BACKGROUND

[0002] The pressure reducing valve is through adjusting, and the import pressure is reduced to certain export pressure needed, and relies on the energy of medium itself, makes the export pressure automatic and keeps stable The valve. Mainly through the resistance of the spring on the pressure reducing valve guide valve, change the throttling area of main channel, make the kinetic energy of medium change, cause the medium to have different pressure loss, and then reach the purpose of reducing pressure. Rely on the control and the regulation of pressure reducing guide valve, make the fluctuation of valve after pressure and spring force balance, make the valve after pressure keep constant in certain error range. Mainly used in water supply and fire water project, play the protection effect to the pipeline.

[0003] At present, the pipeline maintenance of water supply and fire fighting system in domestic usually relies on artificial patrol mode, when the valve after pipeline overpressure condition appears, cannot find and handle in time, thereby causing the service life of pipeline system to reduce, increasing the maintenance management cost of pipeline, the rubber of the diaphragm and valve flap in the pressure reducing valve is damaged after long time use, thereby causing the pressure reducing abnormality, the pressure increase after the valve, if the pipeline bursts due to the excessive pressure in the pipeline, also can cause a large amount of water resource waste, the water use of water unit has safety hidden danger. At the same time, lack of overpressure time, frequency and time period measurement and recording means, so that the working personnel is difficult to analyze the working state of pipeline according to the overpressure condition. UTILITARIAN CONTENT

[0004] In order to solve the problems of easy overpressure and unable to record overpressure data in the prior art, the utility model provides a pressure reducing valve with pressure relief device, which drains and relieves pressure when the pipeline pressure is too large, and transmits signals to the pipe network control room through the detection switch to automatically record data such as overpressure duration, frequency and overpressure time period.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a pressure reducing valve with pressure relief device, which comprises a valve body, a valve body assembly, a valve front cavity and a valve rear cavity are arranged in the valve body, the valve front cavity is communicated with the valve rear cavity, the valve body assembly is arranged at the communication position of the valve front cavity and the valve rear cavity, the valve rear cavity is communicated with a pressure reducing guide valve and a pressure relief device, the pressure relief device has a pressure relief port communicated with the outside, and a detection device is further arranged on the valve body, and the detection device is connected with the pressure relief device.

[0006] In this technical solution, water flows from the pre-valve chamber to the post-valve chamber. The valve body assembly controls the water flow through the valve body by controlling the channel between the pre-valve and post-valve chambers. A pressure-reducing pilot valve is connected to the post-valve chamber. This pilot valve is a key component for pressure reduction, using an adjusting bolt to stabilize the downstream pressure at a constant level. The pressure-reducing pilot valve is a mechanical structure composed of springs, gaskets, and diaphragms, among other components. The diaphragm is prone to aging. When components of the pressure-reducing pilot valve malfunction, overpressure can easily occur downstream of the valve, potentially damaging downstream pipelines or pressure components. Therefore, a pressure relief device with an alarm signal is required to promptly notify control room personnel. The pressure relief device has a relief port. When the pressure in the post-valve chamber exceeds a preset value, overpressure occurs, and the water forcefully opens the device, allowing the overpressurized water to escape, thus reducing the pressure in the post-valve chamber and restoring it to normal levels. This ensures the safety of the downstream pipeline and prevents it from bursting due to excessive internal pressure. Once the water pressure returns to normal, the pressure relief device re-closes, preventing further water leakage and waste. A detection device on the valve body is connected to the pressure relief device. When the device starts operating, the detection device records various data related to the overpressure status of the water, such as duration, frequency, and time period. This data is easily analyzed by staff for subsequent pipeline system maintenance and adjustments. Furthermore, it eliminates the need for on-site personnel to monitor the valve in real time, reducing their workload.

[0007] Preferably, the pressure relief device includes an outer cylinder, the pressure relief port is disposed on the cylinder wall of the outer cylinder, the lower end face of the outer cylinder is provided with a communication port, the communication port is connected to the valve rear cavity, the upper end face of the outer cylinder is provided with a mounting hole, a slide rod is slidably connected to the mounting hole, the slide rod is inserted into the interior of the outer cylinder through the mounting hole, a sealing plate is provided at one end of the slide rod inserted into the outer cylinder, the sealing plate closes the communication port during normal operation, and an elastic element is also provided inside the outer cylinder, the two ends of the elastic element abut against the sealing plate and the inner wall surface of the outer cylinder respectively.

[0008] Preferably, the upper end of the slide rod protrudes beyond the upper end of the outer cylinder, and the portion of the slide rod protruding beyond the outer cylinder is slidably connected to the detection device.

[0009] Preferably, the detection device includes a mounting bracket, a detection switch, and a contact member. The mounting bracket is fixedly mounted on the valve body, the detection switch is mounted on the mounting bracket, and the contact member is fixedly mounted on the detection switch on the side near the pressure relief device. The contact member is slidably connected to the slide rod.

[0010] Preferably, the abutting element is a roller.

[0011] Preferably, the bottom end of the outer cylinder is provided with a socket pipe in communication with the communication port, and an outer wall surface of the socket pipe is a first threaded surface.

[0012] Preferably, an adjusting cylinder is arranged in the mounting hole, a through hole is arranged in the center of the adjusting cylinder, the slide rod is inserted into the through hole and is in sliding connection with the through hole, a bottom foot is arranged at the bottom end of the adjusting cylinder, the bottom foot is in abutment with the elastic member, and an adjusting structure for adjusting the depth of the adjusting cylinder inserted into the outer cylinder is arranged on an inner wall surface of the mounting hole.

[0013] Preferably, the adjusting structure is a third threaded surface, the third threaded surface is a hole wall surface of the mounting hole, and an outer wall surface of the adjusting cylinder is a fourth threaded surface, the third threaded surface is in threaded connection with the fourth threaded surface.

[0014] Preferably, a front valve pressure gauge and a rear valve pressure gauge are arranged on the valve body, the front valve pressure gauge is in communication with the front valve cavity, and the rear valve pressure gauge is in communication with the rear valve cavity.

[0015] Preferably, the front valve pressure gauge and the rear valve pressure gauge are detachably connected with the valve body, a first ball valve is arranged between the front valve pressure gauge and the valve body, and a second ball valve is arranged between the rear valve pressure gauge and the valve body.

[0016] Compared with the prior art, the beneficial effects of the utility model are that the rear valve pressure relief device is arranged on the valve body, overpressure water in the valve can be discharged outward to relieve pressure when the overpressure water, and the downstream pipeline is prevented from being burst due to excessive internal pressure. The detection device detects the working state of the pressure relief device and then detects various data such as time length, frequency and time period when the water is overpressure, facilitates analysis by the staff, and at the same time, the staff does not need to stay to monitor the valve, and the labor load of the staff is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of a pressure reducing valve with a pressure relief device of the utility model;

[0018] Figure 2 is a half sectional view of a valve body in the pressure reducing valve with the pressure relief device of the utility model;

[0019] Figure 3 is a half sectional view of a pressure relief device in the pressure reducing valve with the pressure relief device of the utility model.

[0020] In the drawings: 1, valve body; 2, pressure reducing pilot valve; 3, pressure relief device; 4, detection device; 11, valve body assembly; 12, valve front cavity; 13, valve rear cavity; 14, socket pipe; 15, valve front pressure gauge; 16, valve rear pressure gauge; 17, first ball valve; 18, second ball valve; 31, pressure relief port; 32, outer cylinder; 33, communication port; 34, mounting hole; 35, sliding rod; 36, sealing plate; 37, elastic member; 38, spigot pipe; 39, adjusting cylinder; 41, mounting bracket; 42, detection switch; 43, abutting member; 391, through hole; 392, foot. DETAILED DESCRIPTION

[0021] The drawings are only used for illustrative description, and should not be understood as limiting the patent; in order to better illustrate the embodiments, some components in the drawings can be omitted, enlarged or reduced, and do not represent the actual product size; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted. The positional relationship described in the drawings is only used for illustrative description, and should not be understood as limiting the patent.

[0022] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, structure and operation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description, and should not be understood as limiting the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] The technical scheme of the present application will be further described in detail below through specific embodiments, and in conjunction with the drawings:

[0024] Embodiment 1

[0025] As Figure 1 , 2As shown, a pressure reducing valve with pressure relief device, comprising a valve body 1, a valve body assembly 11, a valve front cavity 12 and a valve rear cavity 13 are arranged in the valve body 1, the valve front cavity 12 is communicated with the valve rear cavity 13, the valve body assembly 11 is arranged at the communication position of the valve front cavity 12 and the valve rear cavity 13, the valve rear cavity 13 is communicated with a pressure reducing pilot valve 2 and a pressure relief device 3, the pressure relief device 3 has a pressure relief port 31 communicated with the outside, a detection device 4 is further arranged on the valve body 1, and the detection device 4 is connected with the pressure relief device 3. Water flows from the valve front cavity 12 to the valve rear cavity 13, and the valve body assembly 11 controls the size of the water flow passing through the valve body 1 by controlling the passage between the valve front cavity 12 and the valve rear cavity 13. The valve rear cavity 13 is communicated with the pressure reducing pilot valve 2, the pressure reducing pilot valve 2 is a key component of the pressure reducing function, and the downstream pressure is adjusted to a certain constant pressure by adjusting the bolt. The pressure reducing pilot valve 2 is a mechanical structure composed of springs, gaskets and diaphragms, etc., among which the diaphragm is prone to aging defects. When the pressure reducing pilot valve 2 fails, the downstream of the valve is prone to overpressure, and the downstream pipeline system or pressure element is prone to damage, so the pressure relief device needs to be set. The pressure relief device has a pressure relief port 31, when the pressure in the valve rear cavity 13 exceeds the preset value, the high pressure will cause the water body to rush out of the pressure relief device, so that the overpressure water body rushes out of the pressure relief device, thereby reducing the pressure of the water body in the valve rear cavity 13 to return to the normal value, thereby ensuring the safety of the downstream pipeline and preventing the pipeline from bursting due to high internal pressure. When the water pressure returns to normal, the pressure relief device is resealed, avoiding more water leakage and causing waste. The detection device 4 arranged on the valve body 1 is connected with the pressure relief device 3, when the pressure relief device 3 starts to work, the detection device 4 can detect the working state of the pressure relief device 3 and transmit relevant information to the external controller, so as to record various data of the overpressure condition of the water body such as time length, frequency and time period, etc., for subsequent workers to analyze and maintain and adjust the pipeline system, and at the same time, the workers do not need to stay and monitor the valve body 1 in real time, reducing the labor load of the workers.

[0026] As Figure 3As shown, the pressure relief device 3 comprises an outer cylinder 32, the pressure relief port 31 is arranged on the cylinder wall of the outer cylinder 32, the lower end surface of the outer cylinder 32 is provided with a communication port 33, the communication port 33 is communicated with the valve rear cavity 13, the upper end surface of the outer cylinder 32 is provided with a mounting hole 34, the sliding rod 35 is slidingly connected with the mounting hole 34, the sliding rod 35 is inserted into the inner part of the outer cylinder 32 from the mounting hole 34, the end of the sliding rod 35 inserted into the outer cylinder 32 is provided with a sealing plate 36, the sealing plate 36 closes the communication port 33, the outer cylinder 32 is further provided with an elastic element 37, the two ends of the elastic element 37 are respectively abutted with the sealing plate 36 and the inner wall surface of the outer cylinder 32. The water body in the valve rear cavity 13 can enter the outer cylinder 32 through the communication port 33 communicated therewith. The sealing plate 36 closes the communication port 33, the water pressure in the valve rear cavity 13 is applied to the sealing plate 36 through the water body. The elastic element 37 arranged behind the sealing plate 36 provides a pressure to the sealing plate 36 to press towards the communication port 33. When the water pressure in the valve rear cavity 13 is within the normal range, the water pressure is insufficient to overcome the pressure provided by the elastic element 37 to the sealing plate, thereby ensuring that the sealing plate 35 can completely close the communication port 33, and the water body will not leak due to the accidental opening of the communication port 33, resulting in the waste of water. When the water body in the valve rear cavity 13 appears overpressure, the elastic element 37 will not be able to completely offset the pressure borne by the sealing plate 36, the sealing plate 36 moves backward under the push of the water pressure, when the sealing plate 36 moves to the rear of the pressure relief port 31, the pressure relief port 31 and the communication port 33 are communicated, and the overpressure water body can be discharged through the pressure relief port 31, thereby reducing the pressure of the valve rear cavity 13 and the downstream pipeline, and protecting the downstream pipeline. When the water pressure in the valve rear cavity 13 returns to the normal value, the pressure of the water body on the sealing plate 36 decreases, the sealing plate 36 is pressed towards the communication port 33 again under the action of the elastic element 37, the communication port 33 is closed again, so that the communication port 33 and the pressure relief port 31 are separated, and the water body cannot flow out through the pressure relief port 31, thereby ensuring that the normal water pressure can be maintained in the pipeline, realizing the automatic opening and closing of the pressure relief port 31, and avoiding the waste caused by excessive water outflow. The sealing plate 36 is connected with the sliding rod 35, the sliding rod 35 is slidingly connected with the mounting hole 34 located at the top of the outer cylinder 32, the mounting hole 34 limits the movement direction of the sliding rod 35 and then limits the movement direction of the sealing plate 36, thereby ensuring that the sealing plate 36 will not be deflected.

[0027] As shown in the figure, Figure 3 The upper end of the sliding rod 35 protrudes from the outer cylinder 32, the part of the sliding rod 35 protruding from the outer cylinder 32 is slidingly connected with the detection device 4. When the water body in the valve rear cavity 13 is overpressure, it will push the sealing plate 36 and then push the sliding rod 35 to move, different water pressure pushes the sliding rod 35 to move different distances, the part of the sliding rod 35 protruding from the outer cylinder 32 is slidingly connected with the detection device 4, the detection device 4 can obtain various data such as time length, frequency and time period when the water body is overpressure through the movement distance and movement time of the sliding rod 35, and record them.

[0028] As shown in the figure, Figure 1As shown, the detection device 4 comprises a mounting bracket 41, a detection switch 42 and an abutting piece 43. The mounting bracket 41 is fixedly installed on the valve body 1. The detection switch 42 is installed on the mounting bracket 41. The abutting piece 43 is fixedly installed on one side of the detection switch 42 close to the pressure relief device 3 and is in sliding connection with the slide rod 35. The mounting bracket 41 is used for fixedly installing the detection switch 42. The detection switch 42 is provided with an information processing device and a communication device. When the water pressure in the valve rear cavity 13 is in a normal state, the slide rod 35 is retracted into the outer cylinder 32. At this time, the slide rod 35 is out of contact with the abutting piece 43. At this time, the information processing device and the communication device in the detection switch 42 do not work and do not send signals to the outside world. When the valve rear cavity 13 and the downstream pipeline are over-pressured, the slide rod 35 moves upward under the action of water pressure. The slide rod 35 is in contact with the abutting piece 43. At this time, the abutting piece 43 is moved under the pushing of the slide rod 35 and drives the detection switch 42 to close. After closing, the information processing device and the communication device work. The information processing device sends a signal to an external controller through the communication device. The controller records the time at this time. When the pressure of the valve rear cavity 13 returns to normal, the slide rod 35 moves downward. When the slide rod 35 is out of contact with the abutting piece 43, the detection switch 33 is disconnected. The information processing device and the communication device stop working at the same time. When the controller cannot receive a signal, it records the time when the signal receiving stops. The time difference between the two times can obtain the information such as the time point and the time length of the over-pressurization of the valve rear cavity 13. The information processing device can obtain the over-pressurized water pressure information by detecting the relative sliding distance between the abutting piece 43 and the slide rod 35 and transmit the information to the controller through the communication device, so as to analyze the state of the pipeline and facilitate the maintenance of the pipeline system.

[0029] As shown in Figure 1 , the abutting piece 43 is a roller. The roller is beneficial to reduce the friction between the abutting piece 43 and the slide rod 35 and avoid wear between the two.

[0030] As shown in Figure 1 , 3 , the bottom end of the outer cylinder 32 is provided with a socket pipe 38. The socket pipe 38 is in communication with the communication port 33. The outer wall surface of the socket pipe 38 is a first threaded surface. The valve body 1 is fixedly provided with a socket pipe 14. The socket pipe 14 is in communication with the valve rear cavity 13. The inner wall surface of the socket pipe 14 is a second threaded surface. The second threaded surface is in threaded connection with the first threaded surface. The first threaded surface located on the socket pipe 38 and the second threaded surface located on the socket pipe 14 are in threaded connection. The pressure relief device 3 is easy to install or dismount on the valve body 1 and is stable in installation, which is convenient for replacing the pressure relief device 3.

[0031] Embodiment 2

[0032] This embodiment is similar to the above-mentioned embodiment 1. The difference lies in that Figure 3As shown, the adjusting cylinder 39 is arranged in the mounting hole 34, the adjusting cylinder 39 is centrally provided with a through hole 391, the slide rod 35 is inserted into the through hole 391 and is in sliding connection with the through hole 391, the bottom end of the adjusting cylinder 39 is provided with a bottom foot 392, the bottom foot 392 is in abutment with the elastic member 37, and the inner wall surface of the mounting hole 34 is provided with an adjusting structure for adjusting the depth of the adjusting cylinder 39 inserted into the outer cylinder 32. The bottom foot 392 arranged at the bottom end of the adjusting cylinder 39 increases the contact area between the adjusting cylinder 39 and the elastic member 37, so that the elastic member 37 is not easy to be separated from the adjusting cylinder 39. By controlling the adjusting structure, the depth of the adjusting cylinder 39 inserted into the outer cylinder 32 is different, the distance between the bottom foot 392 and the bottom of the outer cylinder 32 is also different, and the compression amount of the elastic member 37 compressed by the bottom foot 392 is also different, so that the elastic member 37 provides different pressures for the sealing plate 36, so that different water pressures can push the sealing plate 36 to move, thereby realizing the adjustment of the pressure in the valve rear cavity 13.

[0033] As shown in Figure 3 The adjusting structure is a third threaded surface, the third threaded surface is the hole wall surface of the mounting hole 34, the outer wall surface of the adjusting cylinder 39 is a fourth threaded surface, and the third threaded surface is in threaded connection with the fourth threaded surface. The third threaded surface and the fourth threaded surface make the adjusting cylinder 39 form a bolt hole structure similar to the adjusting cylinder 39 inserted into the outer cylinder 32, and only need to rotate the adjusting cylinder 39 when adjusting the depth of the adjusting cylinder 39 inserted into the outer cylinder 32. Under the action of the thread, the threaded transmission of the adjusting cylinder 39 can be realized, and the compression amount of the elastic member 37 is adjusted.

[0034] Embodiment 3

[0035] This embodiment is similar to the above-mentioned embodiment 1, and the difference is that, as shown in Figure 1 The valve body 1 is provided with a valve front pressure gauge 15 and a valve rear pressure gauge 16, the valve front pressure gauge 15 is in communication with the valve front cavity 12, and the valve rear pressure gauge 16 is in communication with the valve rear cavity 13. The workers can obtain the pressure information in the valve front cavity 12 and the valve rear cavity 13 by directly observing the valve front pressure gauge 15 and the valve rear pressure gauge 16, so as to facilitate the workers to judge the working state of the pipeline and the pressure reducing valve for maintenance.

[0036] As shown in Figure 1As shown, the pre-valve pressure gauge 15 and the post-valve pressure gauge 16 are detachably connected with the valve body 1, the first ball valve 17 is arranged between the pre-valve pressure gauge 15 and the valve body 1, and the second ball valve 18 is arranged between the post-valve pressure gauge 16 and the valve body 1. The pre-valve pressure gauge 15 and the post-valve pressure gauge 16 are measuring instruments which are prone to damage, and need to be replaced regularly to ensure measurement accuracy. Therefore, the pre-valve pressure gauge 15 and the post-valve pressure gauge 16 need to be detachably connected with the valve body 1. When the pre-valve pressure gauge 15 or the post-valve pressure gauge 16 is replaced, only the corresponding first ball valve 17 and second ball valve 18 need to be closed, so that water cannot flow out from the connection between the pre-valve pressure gauge 15 or the post-valve pressure gauge 16 and the valve body 1, and the normal operation of the pressure reducing valve is not affected. When the pre-valve pressure gauge 15 or the post-valve pressure gauge 16 is installed, the corresponding first ball valve 17 or second ball valve 18 is opened.

[0037] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A pressure reducing valve having a pressure relief device, characterized by comprising: The valve body (1) is provided with a valve body assembly (11), a valve front cavity (12) and a valve rear cavity (13), the valve front cavity (12) is communicated with the valve rear cavity (13), the valve body assembly (11) is arranged at the communication position of the valve front cavity (12) and the valve rear cavity (13), the valve rear cavity (13) is communicated with a pressure relief pilot valve (2) and a pressure relief device (3), the pressure relief device (3) has a pressure relief port (31) communicated with the outside, and the valve body (1) is further provided with a detection device (4) connected with the pressure relief device (3).

2. The pressure reducing valve having a pressure relief device according to claim 1, wherein The pressure relief device (3) comprises an outer cylinder (32), the pressure relief port (31) is arranged on the cylinder wall of the outer cylinder (32), the lower end surface of the outer cylinder (32) is provided with a communication port (33) communicated with the valve rear cavity (13), the upper end surface of the outer cylinder (32) is provided with a mounting hole (34), the sliding rod (35) is slidably connected with the mounting hole (34), the sliding rod (35) is inserted into the outer cylinder (32) from the mounting hole (34), one end of the sliding rod (35) inserted into the outer cylinder (32) is provided with a sealing plate (36), the sealing plate (36) closes the communication port (33), and the outer cylinder (32) is further provided with an elastic member (37), the two ends of the elastic member (37) are respectively abutted with the sealing plate (36) and the inner wall surface of the outer cylinder (32).

3. The pressure reducing valve having a pressure relief device according to claim 2, wherein The upper end of the sliding rod (35) protrudes from the upper end of the outer cylinder (32), and the part of the sliding rod (35) protruding from the outer cylinder (32) is slidably connected with the detection device (4).

4. The pressure reducing valve having a pressure relief device according to claim 3, wherein The detection device (4) comprises a mounting bracket (41), a detection switch (42) and an abutting member (43), the mounting bracket (41) is fixedly mounted on the valve body (1), the detection switch (42) is mounted on the mounting bracket (41), the abutting member (43) is fixedly mounted on one side of the detection switch (42) close to the pressure relief device (3), and the abutting member (43) is slidably connected with the sliding rod (35).

5. The pressure reducing valve having a pressure relief device according to claim 4, wherein The abutting member (43) is a roller.

6. The pressure reducing valve having a pressure relief device according to claim 2, wherein The bottom end of the outer cylinder (32) is provided with a socket pipe (38) communicated with the communication port (33), the outer wall surface of the socket pipe (38) is a first threaded surface, the valve body (1) is fixedly provided with a socket pipe (14) communicated with the valve rear cavity (13), the inner wall surface of the socket pipe (14) is a second threaded surface, and the second threaded surface is threadedly connected with the first threaded surface.

7. The pressure reducing valve having a pressure relief device according to claim 2, wherein An adjusting cylinder (39) is arranged in the mounting hole (34), the adjusting cylinder (39) is centrally provided with a through hole (391), the slide rod (35) is inserted into the through hole (391) and is in sliding connection with the through hole (391), the bottom end of the adjusting cylinder (39) is provided with a bottom foot (392), the bottom foot (392) abuts against the elastic member (37), and an adjusting structure for adjusting the depth of the adjusting cylinder (39) inserted into the outer cylinder (32) is arranged on the inner wall surface of the mounting hole (34).

8. The pressure reducing valve having a pressure relief device according to claim 7, wherein The adjusting structure is a third threaded surface, the third threaded surface is the hole wall surface of the mounting hole (34), the outer wall surface of the adjusting cylinder (39) is a fourth threaded surface, and the third threaded surface is in threaded connection with the fourth threaded surface.

9. The pressure reducing valve having a pressure relief device according to claim 1, wherein The valve body (1) is provided with a front valve pressure gauge (15) and a rear valve pressure gauge (16), the front valve pressure gauge (15) is in communication with the front valve cavity (12), and the rear valve pressure gauge (16) is in communication with the rear valve cavity (13).

10. The pressure reducing valve having a pressure relief device according to claim 9, wherein The front valve pressure gauge (15) and the rear valve pressure gauge (16) are detachably connected with the valve body (1), a first ball valve (17) is arranged between the front valve pressure gauge (15) and the valve body (1), and a second ball valve (18) is arranged between the rear valve pressure gauge (16) and the valve body (1).

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