Stress Regulator

Abstract

To provide a pressure regulating device that can suppress the occurrence of malfunctions in the adjustment governor. [Solution] The pressure regulating device includes: a governor provided in a pipe that reduces the primary pressure of the gas flowing through the pipe to a secondary pressure; a pressure sensing line whose upstream end is connected to the upstream side of the pipe relative to the governor and whose downstream end is connected to the downstream side of the pipe relative to the governor; an adjustment governor provided in the pressure sensing line that adjusts the opening degree of the governor so that the secondary pressure of the pipe becomes a preset adjustment pressure; an on-off valve provided downstream of the adjustment governor in the pressure sensing line that, when closed, closes the flow path of the pressure sensing line from the adjustment governor to itself; and an opening mechanism that opens the flow path when the pressure in the flow path reaches a preset pressure.

Description

Technical Field

[0001] The present disclosure relates to a sizing device.

Background Art

[0002] Patent Document 1 discloses a sizing device. In this sizing device, an electric valve that variably adjusts the communication opening degree between an orifice ball and a downstream pipe is provided in a pilot passage so as to be capable of opening and closing. When the electric valve closes and the pilot passage is blocked, the main governor is closed and the operation stops. When the electric valve opens, the pilot passage communicates and the main governor operates. When a start operation signal for starting the main governor is output by remote operation, the control means regulates the speed of the electric valve to operate it at a low speed, and gradually increases the communication opening degree of the pilot passage within a range of a buffer opening degree smaller than the communication opening degree during operation over a predetermined time. Then, when the predetermined time has elapsed, the electric valve is fully opened to make the communication opening degree of the pilot passage the communication opening degree during operation.

[0003] Patent Document 2 discloses a sizing device. The sizing device includes a first main governor, a first regulating governor that adjusts the opening degree of the first main governor so that the secondary pressure of the main pipe becomes the first regulated pressure, and a first sub-regulating governor that adjusts the opening degree of the first main governor so that the secondary pressure of the main pipe becomes a first sub-regulated pressure lower than the first regulated pressure. Further, a second main governor that is provided in parallel with the first main governor with respect to the main pipe and reduces the main pipe gas pressure from the primary pressure to the secondary pressure, and a second regulating governor that adjusts the opening degree of the second main governor so that the secondary pressure of the main pipe becomes the second regulated pressure are provided. The control device closes a first on-off valve provided downstream of the first regulating governor when a predetermined closing condition is satisfied, and opens the first on-off valve when the closing condition is not satisfied.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2014-53047 [Patent Document 2] Japanese Patent Publication No. 2023-88480 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In the pressure regulating devices described in Patent Documents 1 and 2, when the on-off valve located downstream of the regulating governor (pilot governor) is closed, the flow path from the regulating governor to the on-off valve is blocked. This can cause an abnormal increase in internal pressure in the flow path due to leaking gas and rising ambient temperature, potentially leading to malfunctions in the regulating governor. Such malfunctions include failure, damage, malfunction, operational failure, and performance degradation.

[0006] This disclosure aims to provide a pressure regulating device that can suppress the occurrence of malfunctions in a regulating governor. [Means for solving the problem]

[0007] A pressure regulating device according to the first embodiment includes: a governor provided in a pipe that reduces the primary pressure of the gas flowing through the pipe to a secondary pressure; a pressure sensing line whose upstream end is connected to the upstream side of the pipe relative to the governor and whose downstream end is connected to the downstream side of the pipe relative to the governor; an adjustment governor provided in the pressure sensing line that adjusts the opening degree of the governor so that the secondary pressure of the pipe becomes a preset adjustment pressure; an on-off valve provided on the downstream side of the pressure sensing line relative to the adjustment governor and, when closed, closes the flow path of the pressure sensing line from the adjustment governor to itself; and an opening mechanism that opens the flow path when the pressure in the flow path reaches a preset pressure.

[0008] According to the configuration described in the first embodiment, even if the flow path from the regulating governor to the on-off valve is blocked when the on-off valve is closed, the opening mechanism can open the flow path and release the pressure when the pressure in the flow path reaches the set pressure. This prevents the pressure in the blocked flow path from rising abnormally due to leaks (internal leakage) or rising ambient temperature, and prevents malfunctions in the regulating governor.

[0009] In the pressure regulating device according to the second embodiment, in the first embodiment, the opening mechanism includes a relief line whose upstream end is connected to the flow path and whose downstream end is connected to the downstream side of the pressure sensing line relative to the on / off valve, and a relief valve provided on the relief line for opening the relief line.

[0010] According to the configuration described in the second embodiment, the downstream end of the relief line is connected to the downstream side of the on-off valve of the pressure sensing line, making it possible to return the released gas to the flow path within the pressure regulating device without releasing it into the atmosphere (in-line relief). This eliminates the need for a mechanism to release the gas into the atmosphere and suppresses the occurrence of malfunctions in the regulating governor.

[0011] In the third embodiment of the pressure regulating device, in the second embodiment, another on-off valve is provided downstream of the on-off valve in the pressure sensing line, and the downstream end of the relief line is connected downstream of the on-off valve in the pressure sensing line and upstream of the other on-off valve.

[0012] According to the configuration described in the third aspect, even if another on-off valve is provided downstream of the on-off valve in the pressure sensing line, by connecting the downstream end of the relief line to the downstream side of the on-off valve in the pressure sensing line and upstream of the other on-off valve, a configuration that returns the released gas to the pressure sensing line side (in-line relief) can be realized. This makes it possible to suppress the occurrence of malfunctions in the regulating governor while eliminating the need for a mechanism to release the gas to the atmosphere, even when other on-off valves are arranged.

[0013] In the pressure regulating device according to the fourth embodiment, the upstream end of the relief line is connected to a space that constitutes a part of the flow path inside the regulating governor, as in the second embodiment.

[0014] According to the configuration described in the fourth aspect, the upstream end of the relief line is connected to a space that constitutes part of the flow path inside the regulating governor, making it possible to directly release the pressure rise generated inside the regulating governor without going through external piping. This makes it possible to suppress the pressure increase generated inside the regulating governor with high sensitivity.

[0015] In the pressure regulating device according to the fifth embodiment, in the second embodiment, the upstream end of the relief line is connected to the flow path downstream of the pressure sensing line relative to the adjustment governor.

[0016] According to the configuration described in the fifth aspect, the upstream end of the relief line is connected to the flow path downstream of the pressure sensing line's regulating governor, making it possible to branch off from a portion located outside the regulating governor and open up the flow path. This facilitates application to existing equipment configurations and piping arrangements, ensuring design flexibility.

[0017] In the pressure regulating device according to the sixth embodiment, in the first embodiment, the regulating governor includes a venturi restrictor that limits the gas pressure upstream of the governor and supplies it to a primary pilot governor, a primary pilot governor that receives the pressure limited by the venturi restrictor and reduces it to an intermediate pressure, and a secondary pilot governor that adjusts the amount of the intermediate pressure released from the primary pilot governor based on the secondary pressure detected via the pressure detection line, thereby adjusting the pressure downstream of the venturi restrictor as a control pressure for adjusting the opening degree of the governor.

[0018] According to the configuration described in the sixth aspect, the supply pressure of the regulating governor is gradually reduced and its upper limit is also limited by the venturi restrictor, primary pilot governor, and secondary pilot governor. Therefore, even if the flow path of the pressure sensing line is blocked downstream of the regulating governor, it is easier to suppress the pressure rise, and as a result, the occurrence of malfunctions in the regulating governor can be suppressed.

[0019] In the pressure regulating device according to the seventh embodiment, in the first embodiment, the adjusting governor, the on-off valve, the flow path, the opening mechanism, and the regulated pressure are the main adjusting governor, the main on-off valve, the main flow path, the main opening mechanism, and the main regulated pressure, respectively. A sub-adjusting governor, a sub-on-off valve, and a sub-opening mechanism are provided in parallel with the main adjusting governor, the main on-off valve, and the main opening mechanism to the pressure detection line. The sub-adjusting governor adjusts the opening of the governor so that the secondary pressure of the piping becomes a preset sub-adjusting pressure different from the main regulated pressure. The sub-on-off valve is provided downstream of the sub-adjusting governor on the pressure detection line. When closed, it blocks the sub-flow path from the sub-adjusting governor to itself on the pressure detection line. The sub-opening mechanism opens the sub-flow path when the pressure in the sub-flow path reaches a preset pressure.

[0020] According to the configuration described in the seventh aspect, a sub-adjustment governor, a sub-off-off valve, and a sub-opening mechanism are provided in parallel with the main adjustment governor, main on-off valve, and main opening mechanism in the pressure sensing line. Furthermore, the sub-adjustment governor adjusts its opening so that the secondary pressure of the piping becomes a preset sub-adjustment pressure that is different from the main adjustment pressure. This makes it possible to switch between operation using the main adjustment pressure and operation using the sub-adjustment pressure, and even if the sub-flow path is blocked when the sub-off-off valve is closed, the sub-opening mechanism can open the sub-flow path and release the pressure, thereby suppressing the occurrence of malfunctions in the main adjustment governor and the sub-adjustment governor.

[0021] In the pressure regulating device according to the eighth aspect, in the seventh aspect, the sub-opening mechanism includes a sub-relief line having an upstream end connected to the sub-channel and a downstream end connected to the downstream side of the sub-opening / closing valve in the pressure detection line, and a sub-relief valve provided in the sub-relief line for opening the sub-relief line.

[0022] According to the configuration described in the eighth aspect, since the downstream end of the sub-relief line is connected to the downstream side of the sub-opening / closing valve in the pressure detection line, it is possible to return the released gas to the flow path in the pressure regulating device (in-line relief) without discharging it to the atmosphere. As a result, it is possible to suppress the occurrence of problems in the sub-regulating governor while eliminating the need for a mechanism for discharging gas to the atmosphere.

[0023] In the pressure regulating device according to the ninth aspect, in the eighth aspect, another opening / closing valve is provided on the downstream side of the sub-opening / closing valve in the pressure detection line, and the downstream end of the sub-relief line is connected to the downstream side of the sub-opening / closing valve in the pressure detection line and upstream of the other opening / closing valve.

[0024] According to the configuration described in the ninth aspect, even if another opening / closing valve is provided on the downstream side of the sub-opening / closing valve in the pressure detection line, by connecting the downstream end of the sub-relief line to the downstream side of the sub-opening / closing valve in the pressure detection line and upstream of the other opening / closing valve, a configuration (in-line relief) for returning the released gas to the pressure detection line side can be realized. As a result, it is possible to suppress the occurrence of problems in the sub-regulating governor while eliminating the need for a mechanism for discharging gas to the atmosphere even when the arrangement of the other opening / closing valve is taken into account.

[0025] In the pressure regulating device according to the tenth aspect, in the eighth aspect, the upstream end of the sub-relief line is connected to a space that forms a part of the sub-channel inside the sub-regulating governor.

[0026] According to the configuration described in the tenth aspect, since the upstream end of the sub-relief line is connected to the space that forms part of the sub-flow path inside the sub-adjustment governor, it becomes possible to directly release the pressure increase generated inside the sub-adjustment governor without passing through the external piping. As a result, the pressure increase generated inside the sub-adjustment governor can be suppressed sensitively.

[0027] In the pressure regulating device according to the eleventh aspect, in the eighth aspect, the upstream end of the sub-relief line is connected to the sub-flow path on the downstream side of the sub-adjustment governor of the pressure detection line.

[0028] According to the configuration described in the eleventh aspect, since the upstream end of the sub-relief line is connected to the sub-flow path on the downstream side of the sub-adjustment governor of the pressure detection line, it becomes possible to branch from the portion located outside the sub-adjustment governor and release the flow path. As a result, it becomes easy to apply to the existing equipment configuration and piping arrangement, and the flexibility in design can be ensured.

Advantages of the Invention

[0029] According to the present disclosure, with the above configuration, it is possible to suppress the occurrence of problems in the adjustment governor.

Brief Description of the Drawings

[0030] [Figure 1] It is a schematic diagram showing an example of the pressure regulating device according to the first embodiment. [Figure 2] In the configuration shown in FIG. 1, it is a schematic diagram showing an example of a conventional configuration without an opening mechanism. [Figure 3] It is a schematic diagram showing an example of the pressure regulating device according to the second embodiment. [Figure 4] In the configuration shown in FIG. 3, it is a schematic diagram showing an example of a conventional configuration without a main opening mechanism and a sub-opening mechanism.

Modes for Carrying Out the Invention

[0031] An example of an embodiment relating to this disclosure will be described below with reference to the drawings. However, this embodiment is merely an example to illustrate the technical idea of ​​this disclosure, and this disclosure is not limited to the following embodiments. In the following embodiments, the components are not essential unless otherwise specified. Also, unless otherwise specified in this disclosure, the number of each component of this disclosure is not limited to one, but may be multiple.

[0032] When embodiments are described in this disclosure with reference to the drawings, the configuration of such embodiments is not limited to the configuration shown in the drawings. Furthermore, the sizes of the components in each figure are conceptual. Therefore, the front-to-back, left-to-right, and up-to-down dimensional ratios of each component, and the front-to-back, left-to-right, and up-to-down dimensional ratios between components, are not limited to the illustrated dimensional ratios. Also, the front-to-back, left-to-right, and up-to-down dimensional ratios of each component may differ from those in reality.

[0033] In embodiments of this disclosure, components and processes that perform the same function, operation, or function are given the same reference numerals throughout the drawings, and redundant descriptions may be omitted as appropriate. Furthermore, descriptions of configurations not directly related to this disclosure or well-known configurations may be omitted.

[0034] <First Embodiment> A pressure regulating device 10 according to the first embodiment will now be described. Figure 1 is a schematic diagram showing an example of the pressure regulating device 10.

[0035] The pressure regulating device 10 is a device that reduces the primary pressure from the upstream side to the secondary pressure required by consumers or other parties downstream, for example, in a gas supply system (for example, a supply pipeline for city gas, etc.).

[0036] In this embodiment, the pressure regulating device 10 includes a main pipe 14, a main governor 16, a first on-off valve 11, a second on-off valve 12, a pressure sensing line 20, an adjustment governor 30, a solenoid valve 22, an opening mechanism 40, and a downstream on-off valve 24. The parts of the pressure regulating device 10 will be described below.

[0037] <Main piping 14> The main pipe 14 is a pipe for transporting gas as a fluid. The upstream end of this main pipe 14 is connected to the upstream pipe on the supply source side (not shown), and the downstream end is connected to the downstream pipe on the consumer side. The main pipe 14 carries the gas supplied from the supply source side (for example, city gas) towards the consumer side. Note that the main pipe 14 is just one example of a pipe.

[0038] <Main Governor 16> The main governor 16 is installed in the main piping 14. This main governor 16 has the function of reducing the primary pressure of the gas flowing through the main piping 14 to the secondary pressure.

[0039] In this embodiment, the main governor 16 is configured as a pilot-operated governor that adjusts the pressure of the internal fluid by mechanical drive, for example. The opening degree of this main governor 16 is adjusted according to the control pressure (loading pressure) supplied from the adjustment governor 30.

[0040] Here, the control pressure (loading pressure) refers to the fluid pressure generated by the adjustment governor 30 and used to drive the valve body of the main governor 16 to open and close. The main governor 16 receives this loading pressure in its internal drive unit (e.g., diaphragm chamber) and mechanically changes the valve opening degree according to the magnitude of that pressure. Note that the main governor 16 is just one example of a governor.

[0041] <First on-off valve 11 and second on-off valve 12> The first on-off valve 11 and the second on-off valve 12 are valves that open and close the main piping 14. The first on-off valve 11 is located upstream of the main piping 14 relative to the main governor 16. The second on-off valve 12 is located downstream of the main piping 14 relative to the main governor 16.

[0042] The first on-off valve 11 and the second on-off valve 12 are used, for example, to shut off the flow path of the main piping 14 during parts replacement and maintenance inspection of the equipment. In this embodiment, the first on-off valve 11 and the second on-off valve 12 are composed of, for example, manual valves or automatic valves.

[0043] <Pressure detection line 20> The pressure sensing line 20 functions as a channel that detects pressure fluctuations downstream of the main piping 14 and transmits that pressure to the regulating governor 30. Therefore, when the pressure sensing line 20 detects a pressure drop downstream of the main piping 14, that pressure is fed back to the regulating governor 30.

[0044] The upstream end of the pressure sensing line 20 is connected to the upstream side of the main piping 14 relative to the main governor 16. Specifically, the upstream end of the pressure sensing line 20 is connected to the upstream side of the main piping 14 relative to the main governor 16 and to the downstream side of the first on-off valve 11.

[0045] The downstream end of the pressure sensing line 20 is connected to the downstream side of the main piping 14 relative to the main governor 16. Specifically, the downstream end of the pressure sensing line 20 is connected to the downstream side of the main piping 14 relative to the second on-off valve 12. Therefore, the pressure sensing line 20 is capable of detecting the gas pressure downstream of the second on-off valve 12 in the main piping 14.

[0046] <Adjustment Governor 30> The adjustment governor 30 is located on the pressure sensing line 20. The adjustment governor 30 adjusts the opening of the governor so that the secondary pressure of the main pipe 14 reaches a preset adjustment pressure (i.e., target pressure).

[0047] In this embodiment, the regulating governor 30 has a mechanism for gradually reducing the pressure of the fluid passing through it. Specifically, the regulating governor 30 includes a venturi restrictor 33, a primary pilot governor 31, and a secondary pilot governor 32.

[0048] The venturi restrictor 33 limits the gas pressure upstream of the main governor 16 and supplies it to the primary pilot governor 31.

[0049] The primary pilot governor 31 receives the pressure restricted by the venturi restrictor 33 and reduces it to an intermediate pressure. The secondary pilot governor 32 further reduces the intermediate pressure reduced by the primary pilot governor 31. In this way, the primary pilot governor 31 functions as a primary-side control valve for gradually releasing pressure in the regulating governor 30, and the secondary pilot governor 32 functions as a secondary-side control valve.

[0050] The secondary pilot governor 32 adjusts the amount of intermediate pressure released from the primary pilot governor 31 based on the secondary pressure detected via the pressure sensing line 20, thereby adjusting the control pressure (loading pressure) in the loading line 38 to the desired pressure.

[0051] In the adjustment governor 30, a loading line 38 branches off from the venturi restrictor 33 and communicates with the drive unit (e.g., the diaphragm chamber) of the main governor 16. The loading line 38 is a pressure transmission path that transmits the generated control pressure to the drive unit of the main governor 16.

[0052] The adjustment governor 30 controls the operation of the main governor 16 by increasing or decreasing the loading pressure delivered through the loading line 38, thereby adjusting the amount of gas released by the primary pilot governor 31 and the secondary pilot governor 32 based on fluctuations in the secondary pressure fed back from the pressure sensing line 20.

[0053] <Solenoid valve 22> The solenoid valve 22 is located downstream of the pressure sensing line 20 from the regulating governor 30 (specifically, the secondary pilot governor 32). In this embodiment, the solenoid valve 22 opens and closes based on a signal, for example, from remote control, and by closing the line, it forcibly stops the operation of the regulating governor 30, leading the main governor 16 to a fully closed state.

[0054] When closed, the solenoid valve 22 blocks the flow path 23 from the regulating governor 30 of the pressure sensing line 20 to itself. The internal volume of the flow path 23, which becomes a blocked space at this time, is generally relatively small, about the sum of the internal volume of the equipment and the volume of the piping. The solenoid valve 22 is an example of an on / off valve.

[0055] <Opening mechanism 40> The opening mechanism 40 is a mechanism that opens the flow path 23 when the pressure in the flow path 23 reaches a preset pressure. Specifically, the opening mechanism 40 is a mechanism that opens the flow path 23 to release pressure when the internal pressure of the flow path 23, which is closed by the closing of the solenoid valve 22, rises abnormally due to a rise in ambient temperature or leak gas (internal leakage) from the regulating governor 30.

[0056] Furthermore, "overflow gas" refers to the phenomenon where a small amount of gas leaks to the secondary side (downstream side) through tiny gaps between the valve body of the regulating governor 30 (specifically, the secondary pilot governor 32, etc.) and the valve seat, even when the valve body is in a fully closed position.

[0057] In this embodiment, the release mechanism 40 includes a relief line 42 and a relief valve 44.

[0058] The upstream end of the relief line 42 is connected to the flow path 23. Specifically, the upstream end of the relief line 42 is connected to a space (hereinafter referred to as the "configuration space") that constitutes a part of the flow path 23 inside the regulating governor 30. In this way, the upstream end of the relief line 42 branches off from the configuration space inside the regulating governor 30 (specifically, the secondary pilot governor 32). This configuration space is, for example, an internal space in the secondary pilot governor 32 where secondary pressure is introduced and a control pressure is generated to adjust the opening degree of the main governor 16 based on this secondary pressure.

[0059] The downstream end of the relief line 42 is connected to the downstream side of the pressure sensing line 20 relative to the solenoid valve 22. Specifically, the downstream end of the relief line 42 is connected to the downstream side of the pressure sensing line 20 relative to the solenoid valve 22 and to the upstream side of the downstream on-off valve 24.

[0060] As described above, the downstream end of the relief line 42 is connected to the downstream side of the solenoid valve 22 in the pressure sensing line 20. In other words, in this embodiment, an "in-line relief" method is adopted as an example, in which the relief line 42 is connected downstream of the solenoid valve 22. With this method, the gas can be returned to the flow path without being released into the atmosphere, so a flexible design that takes into account the impact on the surrounding environment is possible, for example, when there are restrictions on ventilation conditions at the installation site or when a specific type of gas is used.

[0061] The relief valve 44 is located in the relief line 42. The relief valve 44 opens the relief line 42. Specifically, the relief valve 44 opens the relief line 42 when the pressure in the flow path 23 reaches a preset pressure. This preset pressure is set, for example, within a range between the set pressure of the regulating governor 30 and the upper limit of the pilot governor's operating pressure (service pressure).

[0062] <Example of release mechanism 40> In this embodiment, the upstream end of the relief line 42 is connected to the internal space of the adjustment governor 30, but is not limited to this. As an example of the relief line of this disclosure, the upstream end may be connected to the flow path 23 downstream of the pressure sensing line 20 relative to the adjustment governor 30. That is, the relief line 42 may branch off from the equipment itself or from piping, as long as it is between the internal space of the adjustment governor 30 and the primary side of the solenoid valve 22.

[0063] Furthermore, in this embodiment, the downstream end of the relief line 42 is connected to the downstream side of the pressure sensing line 20 relative to the solenoid valve 22, but this is not limited to this. For example, the downstream end of the relief line 42 may be open to the atmosphere without being connected to the pressure sensing line 20. In this case, when the relief valve 44 is opened, the gas released from the flow path 23 through the relief line 42 is released into the atmosphere. With this configuration, piping work for connecting the downstream side of the relief line 42 is unnecessary, and the device configuration can be simplified.

[0064] <Downstream on / off valve 24> The downstream on-off valve 24 is located downstream of the solenoid valve 22 in the pressure sensing line 20. The downstream on-off valve 24 is used, for example, to shut off the flow path of the pressure sensing line 20 during parts replacement and maintenance inspection of the equipment. In this embodiment, the downstream on-off valve 24 is composed of, for example, a manual valve or an automatic valve. Note that the downstream on-off valve 24 is just one example of another on-off valve.

[0065] <Effects and Effects According to the First Embodiment> In the pressure regulating device 10 according to this embodiment, when the solenoid valve 22 is closed, the flow path 23 from the regulating governor 30 to the solenoid valve 22 is blocked. In this blocked state, if gas leaks (internal leakage) from the regulating governor 30 or the ambient temperature rises, the pressure in the flow path 23 may increase.

[0066] As shown in Figure 2, in the conventional configuration without the opening mechanism 40, if the pressure in the flow path 23 increases, the internal pressure in the closed flow path 23 rises rapidly due to its small volume, potentially exceeding the operating pressure of the regulating governor 30. As a result, the regulating governor 30 may malfunction.

[0067] The defects include malfunctions, damage, failure, operational problems, and performance degradation. Specifically, these defects include, for example, fracture, damage, or deformation of components (e.g., diaphragms, valve bodies, valve seats, and sealing members), operational problems due to component sticking, and performance degradation such as increased gas leakage (internal leakage) and reduced pressure regulation accuracy.

[0068] In contrast, according to the pressure regulating device 10 of this embodiment, even if the flow path 23 from the adjusting governor 30 to the solenoid valve 22 is blocked when the solenoid valve 22 is closed, the opening mechanism 40 can open the flow path 23 and release the pressure when the pressure in the flow path 23 reaches the set pressure.

[0069] This prevents the pressure in the blocked flow path 23 from rising abnormally due to leaks (internal leakage) or rising ambient temperature, thereby suppressing malfunctions in the regulating governor 30.

[0070] Furthermore, in this embodiment, since the downstream end of the relief line 42 is connected to the downstream side of the solenoid valve 22 of the pressure detection line 20, it becomes possible to return the released gas to the flow path within the pressure regulating device 10 without releasing it into the atmosphere (in-line relief).

[0071] This eliminates the need for a mechanism to release the gas to the atmosphere while suppressing the occurrence of malfunctions in the adjustment governor 30.

[0072] Furthermore, in this embodiment, even if a downstream on-off valve 24 is provided downstream of the solenoid valve 22 in the pressure detection line 20, by connecting the downstream end of the relief line 42 to the downstream side of the solenoid valve 22 and the upstream side of the downstream on-off valve 24 in the pressure detection line 20, a configuration that returns the released gas to the pressure detection line 20 side (in-line relief) can be realized.

[0073] This eliminates the need for a mechanism to release the gas to the atmosphere, even when the downstream on-off valve 24 is positioned, while suppressing the occurrence of malfunctions in the regulating governor 30.

[0074] Furthermore, in this embodiment, since the upstream end of the relief line 42 is connected to the internal space of the regulating governor 30, the pressure rise generated inside the regulating governor 30 can be directly released without going through external piping. This allows for sensitive suppression of the pressure increase generated inside the internal space of the regulating governor 30.

[0075] In this embodiment, the supply pressure of the regulating governor 30 is gradually reduced and its upper limit is also restricted by the venturi restrictor 33, the primary pilot governor 31, and the secondary pilot governor 32. Therefore, even if the flow path 23 is blocked downstream of the regulating governor 30 in the pressure sensing line 20, it is easier to suppress the pressure rise, and as a result, the occurrence of malfunctions in the regulating governor 30 can be suppressed.

[0076] Furthermore, as shown in the modified example of the opening mechanism 40, when the upstream end of the relief line 42 is connected to the flow path 23 downstream of the pressure sensing line 20 relative to the regulating governor 30, it becomes possible to open the flow path 23 by branching off from a portion located outside the regulating governor 30. This facilitates application to existing equipment configurations and piping arrangements, ensuring design flexibility.

[0077] <Second Embodiment> A pressure regulating device 200 according to the second embodiment will now be described. Figure 3 is a schematic diagram showing an example of the pressure regulating device 200. Parts configured identically to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

[0078] The pressure regulating device 200, like the pressure regulating device 10, is a device that reduces the primary pressure from the upstream side to the secondary pressure required by consumers and the like on the downstream side, for example, in a gas supply system (e.g., a supply pipeline for city gas, etc.).

[0079] In this embodiment, the pressure regulating device 200, like the pressure regulating device 10, includes a main pipe 14, a main governor 16, a first on-off valve 11, and a second on-off valve 12.

[0080] Furthermore, the pressure regulating device 200 includes a main system and a sub-system arranged in parallel with each other as a system for adjusting the opening degree of the main governor 16. The main system includes a main pressure sensing line 120, a main adjustment governor 130, a main solenoid valve 122, a main opening mechanism 140, and a downstream on-off valve 124. When closed, the main solenoid valve 122 blocks the main flow path 123 from the main adjustment governor 130 to itself in the main pressure sensing line 120.

[0081] The main pressure sensing line 120, main adjustment governor 130, main solenoid valve 122, main opening mechanism 140, downstream on-off valve 124, main flow path 123, main relief line 142, main relief valve 144, and main loading line 138 correspond to the pressure sensing line 20, adjustment governor 30, solenoid valve 22, opening mechanism 40, downstream on-off valve 24, flow path 23, relief line 42, relief valve 44, and loading line 38 in the first embodiment, respectively. Therefore, the descriptions of the main pressure sensing line 120, main adjustment governor 130, main solenoid valve 122, main opening mechanism 140, downstream on-off valve 124, main flow path 123, main relief line 142, main relief valve 144, and main loading line 138 are omitted. Note that the main solenoid valve 122 is an example of a main on-off valve. Also, the downstream on-off valve 124 is an example of another on-off valve.

[0082] The sub-system includes a sub-pressure sensing line 220, a sub-regulating governor 230, a sub-solenoid valve 222, and a sub-opening mechanism 240. The sub-system is connected in parallel to the main system and is operated by switching to it or together with the main system under specific operating conditions (for example, when the main system is shut off or under low load). The sub-solenoid valve 222 is an example of a sub-on-off valve. The parts of the pressure regulating device 200 will be described below.

[0083] <Sub-pressure detection line 220> The sub-pressure detection line 220, like the main pressure detection line 120, functions as a channel that detects pressure fluctuations downstream of the main piping 14 and transmits that pressure to the sub-regulating governor 230. Therefore, when the sub-pressure detection line 220 detects a pressure drop downstream of the main piping 14, that pressure is fed back to the sub-regulating governor 230.

[0084] This sub-pressure detection line 220 is provided in parallel with the main pressure detection line 120. In this embodiment, the sub-pressure detection line 220 shares a portion of its primary side (upstream side) and a portion of its secondary side (downstream side) with the main pressure detection line 120. Specifically, the sub-pressure detection line 220 branches off from the main pressure detection line 120 at branching point 220A between the primary pilot governor 131 and the secondary pilot governor 132 on the upstream side. The sub-pressure detection line 220 merges with the main pressure detection line 120 at confluence point 220B between the main solenoid valve 122 and the downstream on-off valve 124 on the downstream side.

[0085] Therefore, it can be understood that the sub-pressure detection line 220, like the main pressure detection line 120, has its upstream and downstream ends connected as follows: The upstream end of the sub-pressure detection line 220 is connected to the upstream side of the main piping 14 relative to the main governor 16. Specifically, the upstream end of the sub-pressure detection line 220 is connected to the upstream side of the main piping 14 relative to the main governor 16 and to the downstream side of the first on-off valve 11.

[0086] Furthermore, the downstream end of the sub-pressure detection line 220 is connected to the downstream side of the main piping 14 relative to the main governor 16. Specifically, the downstream end of the sub-pressure detection line 220 is connected to the downstream side of the main piping 14 relative to the second on-off valve 12. Therefore, the sub-pressure detection line 220 is capable of detecting the gas pressure downstream of the second on-off valve 12 in the main piping 14.

[0087] <Sub-adjustment governor 230> The sub-adjustment governor 230 is located on the sub-pressure detection line 220. In this embodiment, the sub-adjustment governor 230 shares the venturi restrictor 133 and primary pilot governor 131 of the main adjustment governor 130, and also has a secondary pilot governor 232. The secondary pilot governor 232 adjusts the intermediate pressure reduced by the primary pilot governor 131 to a control pressure for adjusting the opening of the main governor 16 by adjusting the amount released based on the secondary pressure detected via the sub-pressure detection line 220. The sub-adjustment governor 230 adjusts the opening of the main governor 16 so that the detected secondary pressure becomes the sub-adjustment pressure (for example, a pressure lower than the main adjustment pressure).

[0088] <Sub-solenoid valve 222> The sub-solenoid valve 222 is located downstream of the sub-regulating governor 230 (specifically, the secondary pilot governor 232) in the sub-pressure sensing line 220.

[0089] In this embodiment, for example, by opening the main solenoid valve 122 and closing the sub-solenoid valve 222, it is possible to perform pressure regulation based on the main regulated pressure (activating the main regulated governor 130). On the other hand, by closing the main solenoid valve 122 and opening the sub-solenoid valve 222, it is possible to perform pressure regulation based on the sub-regulated pressure (activating the sub-regulated governor 230).

[0090] When closed, the sub-solenoid valve 222 blocks the sub-flow channel 223 from the sub-adjustment governor 230 of the sub-pressure detection line 220 to itself. The internal volume of the sub-flow channel 223, which forms the blocked space at this time, is generally relatively small, roughly equivalent to the sum of the internal volume of the equipment and the volume of the piping.

[0091] <Sub-opening mechanism 240> The sub-opening mechanism 240 is a mechanism that opens the sub-flow channel 223 when the pressure in the sub-flow channel 223 reaches a preset pressure. Specifically, when the internal pressure of the sub-flow channel 223, which is closed by the closing of the sub-solenoid valve 222, rises abnormally due to a rise in ambient temperature or leak gas (internal leakage) from the sub-regulating governor 230, this mechanism opens the sub-flow channel 223 to release the pressure.

[0092] In this embodiment, the sub-opening mechanism 240 includes a sub-relief line 242 and a sub-relief valve 244.

[0093] The upstream end of the sub-relief line 242 is connected to the sub-channel 223. Specifically, the upstream end of the sub-relief line 242 is connected to a space (hereinafter referred to as the constituent space) that constitutes a part of the sub-channel 223 inside the sub-regulating governor 230. In this way, the upstream end of the sub-relief line 242 branches off from the constituent space inside the sub-regulating governor 230.

[0094] The downstream end of the sub-relief line 242 is connected to the downstream side of the sub-pressure sensing line 220 relative to the sub-solenoid valve 222. Specifically, the downstream end of the sub-relief line 242 is connected to the downstream side of the sub-pressure sensing line 220 relative to the sub-solenoid valve 222 and to the upstream side of the downstream on-off valve 124.

[0095] Thus, the downstream end of the sub-relief line 242 is connected to merge with the downstream side of the sub-solenoid valve 222 in the sub-pressure detection line 220. In other words, in this embodiment, an "in-line relief" method is adopted as an example, in which the sub-relief line 242 is merged downstream of the sub-solenoid valve 222. With this method, the gas can be returned into the flow path without being released into the atmosphere, so a flexible design that takes into account the impact on the surrounding environment is possible, for example, when there are restrictions on ventilation conditions at the installation site or when a specific type of gas is used.

[0096] The sub-relief valve 244 is located in the sub-relief line 242. The sub-relief valve 244 opens the sub-relief line 242. Specifically, the sub-relief valve 244 opens the sub-relief line 242 when the pressure in the sub-flow path 223 reaches a preset pressure. This preset pressure is set, for example, within a range between the set pressure of the sub-adjustment governor 230 and the upper limit of the pilot governor's operating pressure (service pressure).

[0097] <Modified example of sub-opening mechanism 240> In this embodiment, the upstream end of the sub-relief line 242 is connected to the internal configuration space of the sub-regulating governor 230, but is not limited to this. As an example of the relief line of this disclosure, the upstream end may be connected to the sub-flow channel 223 downstream of the sub-pressure sensing line 220 relative to the sub-regulating governor 230. That is, the sub-relief line 242 may branch off from the equipment itself or from piping, as long as it is between the internal configuration space of the sub-regulating governor 230 and the primary side of the sub-solenoid valve 222.

[0098] Furthermore, in this embodiment, the downstream end of the sub-relief line 242 is connected to the downstream side of the sub-pressure detection line 220 relative to the sub-solenoid valve 222, but this is not limited to this. For example, the downstream end of the sub-relief line 242 may be open to the atmosphere without being connected to the sub-pressure detection line 220. In this case, when the sub-relief valve 244 is opened, the gas released from the sub-flow channel 223 through the sub-relief line 242 is released into the atmosphere. With this configuration, piping work for connecting the downstream side of the sub-relief line 242 is unnecessary, and the device configuration can be simplified.

[0099] <Effects and Effects According to the Second Embodiment> In the pressure regulating device 200 according to this embodiment, when the main solenoid valve 122 is closed, the main flow path 123 from the main adjustment governor 130 to the main solenoid valve 122 is blocked. In this blocked state, if gas leaks (internal leakage) from the main adjustment governor 130 or the ambient temperature rises, the pressure in the main flow path 123 may increase.

[0100] As shown in Figure 4, in the conventional configuration without the main opening mechanism 140, if the pressure in the main flow path 123 increases, the internal pressure in the closed main flow path 123 rises rapidly due to its small volume, potentially exceeding the operating pressure of the main adjustment governor 130. As a result, the main adjustment governor 130 may malfunction.

[0101] In contrast, according to the pressure regulating device 200 of this embodiment, even if the main flow path 123 from the main adjustment governor 130 to the main solenoid valve 122 is blocked when the main solenoid valve 122 is closed, the main opening mechanism 140 can open the main flow path 123 and release the pressure when the pressure in the main flow path 123 reaches the set pressure.

[0102] This prevents the pressure in the blocked main flow path 123 from rising abnormally due to leaks (internal leakage) or rising ambient temperature, thereby suppressing malfunctions in the main adjustment governor 130.

[0103] Furthermore, in the pressure regulating device 200 according to this embodiment, when the sub-solenoid valve 222 is closed, the sub-flow channel 223 from the sub-regulating governor 230 to the sub-solenoid valve 222 is blocked. In this blocked state, if gas leaks (internal leakage) from the sub-regulating governor 230 or the ambient temperature rises, the pressure in the sub-flow channel 223 may increase.

[0104] As shown in Figure 4, in the conventional configuration without the sub-opening mechanism 240, if the pressure in the sub-flow channel 223 increases, the internal pressure in the closed sub-flow channel 223 rises rapidly due to its small volume, potentially exceeding the operating pressure of the sub-regulating governor 230. As a result, the sub-regulating governor 230 may malfunction.

[0105] In contrast, according to the pressure regulating device 200 of this embodiment, even if the sub-flow channel 223 from the sub-adjustment governor 230 to the sub-solenoid valve 222 is blocked when the sub-solenoid valve 222 is closed, the sub-opening mechanism 240 can open the sub-flow channel 223 and release the pressure when the pressure in the sub-flow channel 223 reaches the set pressure.

[0106] This prevents the pressure in the blocked sub-channel 223 from rising abnormally due to leaks (internal leakage) or rising ambient temperature, thereby suppressing malfunctions in the sub-regulating governor 230.

[0107] Furthermore, in this embodiment, a sub-adjustment governor 230, a sub-solenoid valve 222, and a sub-opening mechanism 240 are provided in parallel with the main adjustment governor 130, the main solenoid valve 122, and the main opening mechanism 140 in the pressure sensing line. The sub-adjustment governor 230 adjusts the opening degree of the governor so that the secondary pressure of the piping becomes a preset sub-adjustment pressure that is different from the main adjustment pressure.

[0108] This allows switching between operation using the main regulating pressure and operation using the sub-regulating pressure, while in either operation mode, the pressure rise in the potentially blocked flow paths (main flow path 123, sub-flow path 223) can be suppressed by the opening mechanism (main opening mechanism 140, sub-opening mechanism 240), thereby suppressing the occurrence of malfunctions in the regulating governors (main regulating governor 130, sub-regulating governor 230).

[0109] Furthermore, in this embodiment, since the downstream end of the sub-relief line 242 is connected to the downstream side of the sub-solenoid valve 222 in the sub-pressure detection line 220, it becomes possible to return the released gas to the flow path within the pressure regulating device 200 without releasing it into the atmosphere (in-line relief). This eliminates the need for a mechanism to release the gas into the atmosphere and suppresses the occurrence of malfunctions in the sub-regulating governor 230.

[0110] Furthermore, in this embodiment, even if a downstream on-off valve 124 is provided downstream of the sub-solenoid valve 222 in the sub-pressure detection line 220, a configuration can be achieved in which the released gas is returned to the pressure detection line by connecting the downstream end of the sub-relief line 242 downstream of the sub-solenoid valve 222 and upstream of the downstream on-off valve 124 in the sub-pressure detection line 220.

[0111] This eliminates the need for a mechanism to release the gas to the atmosphere, even when the downstream on-off valve 124 is positioned, while suppressing the occurrence of malfunctions in the sub-adjustment governor 230.

[0112] Furthermore, in this embodiment, since the upstream end of the sub-relief line 242 is connected to the internal space of the sub-adjustment governor 230, the pressure rise generated inside the sub-adjustment governor 230 can be directly released without going through external piping. This allows for sensitive suppression of the pressure increase generated in the internal space of the sub-adjustment governor 230.

[0113] Furthermore, as shown in the modified example of the sub-opening mechanism 240, when the upstream end of the sub-relief line 242 is connected to the sub-flow channel 223 downstream of the sub-pressure sensing line 220 relative to the sub-adjustment governor 230, it becomes possible to open the sub-flow channel 223 by branching off from a portion located outside the sub-adjustment governor 230. This facilitates application to existing equipment configurations and piping arrangements, ensuring design flexibility.

[0114] The present invention is not limited to the embodiments described above, and various modifications, changes, and improvements are possible without departing from the spirit of the invention. For example, the modified forms shown above may be combined in any way.

[0115] <Note> [Aspect 1] A governor is installed in the piping and reduces the primary pressure of the gas flowing through the piping to a secondary pressure, A pressure sensing line whose upstream end is connected to the upstream side of the piping relative to the governor, and whose downstream end is connected to the downstream side of the piping relative to the governor, An adjustment governor is provided in the pressure sensing line and adjusts the opening degree of the governor so that the secondary pressure of the piping becomes a preset adjustment pressure. An on / off valve is provided downstream of the pressure sensing line from the adjustment governor, and when closed, it closes the flow path of the pressure sensing line from the adjustment governor to itself. An opening mechanism that opens the flow path when the pressure in the flow path reaches a preset pressure, Equipped with, Pressure regulating device. [Aspect 2] The aforementioned release mechanism is A relief line whose upstream end is connected to the flow path and whose downstream end is connected to the downstream side of the pressure sensing line relative to the on / off valve, A relief valve is provided in the relief line and opens the relief line, Having, A pressure regulating device as described in Embodiment 1. [Aspect 3] Another on-off valve is provided downstream of the on-off valve in the pressure sensing line. The downstream end of the relief line is connected to the pressure sensing line on the downstream side of the on-off valve and on the upstream side of the other on-off valve. A pressure regulating device as described in embodiment 2. [Aspect 4] The upstream end of the aforementioned relief line is It is connected to a space that constitutes a part of the flow path inside the aforementioned adjustment governor. A pressure regulating device as described in embodiment 2. [Aspect 5] The upstream end of the aforementioned relief line is The pressure sensing line is connected to the flow path downstream of the regulating governor, A pressure regulating device according to any one of embodiments 2 to 4. [Aspect 6] The aforementioned adjustment governor is A venturi restrictor that limits the pressure of the gas upstream of the governor and supplies it to the primary pilot governor, A primary pilot governor that receives the pressure limited by the venturi restrictor and reduces it to an intermediate pressure, A secondary pilot governor adjusts the amount of the intermediate pressure released from the primary pilot governor based on the secondary pressure detected via the pressure detection line, thereby adjusting the pressure downstream of the venturi restrictor as a control pressure for adjusting the opening degree of the governor. Having, A pressure regulating device according to any one of embodiments 1 to 5. [Aspect 7] The adjusting governor, the on-off valve, the flow path, the opening mechanism, and the adjusting pressure are, respectively, the main adjusting governor, the main on-off valve, the main flow path, the main opening mechanism, and the main adjusting pressure. In parallel with the main adjustment governor, the main on-off valve, and the main opening mechanism, a sub-adjustment governor, a sub-on-off valve, and a sub-opening mechanism are provided with respect to the pressure sensing line. The sub-adjustment governor adjusts its opening so that the secondary pressure in the piping becomes a preset sub-adjustment pressure that is different from the main adjustment pressure. The aforementioned sub-on-off valve is provided downstream of the sub-adjustment governor of the pressure sensing line, and when closed, it blocks the sub-flow path from the sub-adjustment governor of the pressure sensing line to itself. The sub-opening mechanism opens the sub-flow channel when the pressure in the sub-flow channel reaches a preset pressure. A pressure regulating device according to any one of embodiments 1 to 6. [Aspect 8] The aforementioned sub-opening mechanism is A sub-relief line whose upstream end is connected to the sub-flow channel and whose downstream end is connected to the downstream side of the pressure sensing line relative to the sub-on / off valve, A sub-relief valve is provided in the sub-relief line and opens the sub-relief line, Having, A pressure regulating device as described in Embodiment 7. [Aspect 9] Another on-off valve is provided downstream of the sub-on-off valve in the pressure sensing line. The downstream end of the sub-relief line is connected to the pressure sensing line on the downstream side of the sub-on-off valve and on the upstream side of the other on-off valve. A pressure regulating device as described in embodiment 8. [Aspect 10] The upstream end of the aforementioned sub-relief line is It is connected to a space that constitutes a part of the sub-flow channel inside the sub-adjustment governor, A pressure regulating device according to embodiment 8 or embodiment 9. [Aspect 11] The upstream end of the aforementioned sub-relief line is The pressure sensing line is connected to the sub-flow channel downstream of the sub-adjustment governor, A pressure regulating device according to embodiment 8 or embodiment 9. [Explanation of symbols]

[0116] 10 Pressure regulator 11 First shut-off valve 12 Second shut-off valve 14. Main piping (example of piping) 16. Main Governor (An example of a governor) 20 pressure sensing lines 22. Solenoid valve (an example of an on / off valve) 23 Flow channels 24. Downstream shut-off valve (an example of another shut-off valve) 30 Adjustment Governor 31 Primary Pilot Governor 32 Secondary Pilot Governor 33 Venturi restrictor 38 Loading Line 40 Opening mechanism 42 Relief lines 44 Relief valve 120 Main pressure sensing line 122 Main Solenoid Valve (An example of a main on / off valve) 123 Main channel 124 Downstream shut-off valve (an example of another shut-off valve) 130 Main Adjustment Governor 131 Primary Pilot Governor 132 Secondary Pilot Governor 133 Venturi restrictor 138 Main Loading Line 140 Main release mechanism 142 Main Relief Line 144 Main relief valve 200 Pressure regulator 220 Sub-pressure sensing lines 220A Junction 220B Confluence 222 Sub-solenoid valve (an example of a sub-on / off valve) 223 Subchannel 230 Sub-adjustment governor 232 Secondary Pilot Governor 240 Sub-opening mechanism 242 Sub-relief lines 244 Sub-relief valve

Claims

1. A governor is installed in the piping and reduces the primary pressure of the gas flowing through the piping to a secondary pressure, A pressure sensing line whose upstream end is connected to the upstream side of the piping relative to the governor, and whose downstream end is connected to the downstream side of the piping relative to the governor, An adjustment governor is provided in the pressure sensing line and adjusts the opening degree of the governor so that the secondary pressure of the piping becomes a preset adjustment pressure. An on / off valve is provided downstream of the pressure sensing line from the adjustment governor, and when closed, it closes the flow path of the pressure sensing line from the adjustment governor to itself. An opening mechanism that opens the flow path when the pressure in the flow path reaches a preset pressure, Equipped with, Pressure regulating device.

2. The aforementioned release mechanism is A relief line whose upstream end is connected to the flow path and whose downstream end is connected to the downstream side of the pressure sensing line relative to the on / off valve, A relief valve is provided in the relief line and opens the relief line, Having, The pressure regulating device according to claim 1.

3. Another on-off valve is provided downstream of the on-off valve in the pressure sensing line. The downstream end of the relief line is connected to the pressure sensing line on the downstream side of the on-off valve and on the upstream side of the other on-off valve. The pressure regulating device according to claim 2.

4. The upstream end of the aforementioned relief line is It is connected to a space that constitutes a part of the flow path inside the aforementioned adjustment governor. The pressure regulating device according to claim 2.

5. The upstream end of the aforementioned relief line is The pressure sensing line is connected to the flow path downstream of the regulating governor, The pressure regulating device according to claim 2.

6. The aforementioned adjustment governor is A venturi restrictor that limits the pressure of the gas upstream of the governor and supplies it to the primary pilot governor, A primary pilot governor that receives the pressure limited by the venturi restrictor and reduces it to an intermediate pressure, A secondary pilot governor adjusts the amount of the intermediate pressure released from the primary pilot governor based on the secondary pressure detected via the pressure detection line, thereby adjusting the pressure downstream of the venturi restrictor as a control pressure for adjusting the opening degree of the governor. Having, The pressure regulating device according to claim 1.

7. The adjusting governor, the on-off valve, the flow path, the opening mechanism, and the adjusting pressure are, respectively, the main adjusting governor, the main on-off valve, the main flow path, the main opening mechanism, and the main adjusting pressure. In parallel with the main adjustment governor, the main on-off valve, and the main opening mechanism, a sub-adjustment governor, a sub-on-off valve, and a sub-opening mechanism are provided with respect to the pressure sensing line. The sub-adjustment governor adjusts its opening so that the secondary pressure in the piping becomes a preset sub-adjustment pressure that is different from the main adjustment pressure. The aforementioned sub-on-off valve is provided downstream of the sub-adjustment governor of the pressure sensing line, and when closed, it blocks the sub-flow path from the sub-adjustment governor of the pressure sensing line to itself. The sub-opening mechanism opens the sub-flow channel when the pressure in the sub-flow channel reaches a preset pressure. The pressure regulating device according to claim 1.

8. The aforementioned sub-opening mechanism is A sub-relief line whose upstream end is connected to the sub-flow channel and whose downstream end is connected to the downstream side of the pressure sensing line relative to the sub-on / off valve, A sub-relief valve is provided in the sub-relief line and opens the sub-relief line, Having, The pressure regulating device according to claim 7.

9. Another on-off valve is provided downstream of the sub-on-off valve in the pressure sensing line. The downstream end of the sub-relief line is connected to the pressure sensing line on the downstream side of the sub-on-off valve and on the upstream side of the other on-off valve. The pressure regulating device according to claim 8.

10. The upstream end of the aforementioned sub-relief line is It is connected to a space that constitutes a part of the sub-flow channel inside the sub-adjustment governor, The pressure regulating device according to claim 8.

11. The upstream end of the aforementioned sub-relief line is The pressure sensing line is connected to the sub-flow channel downstream of the sub-adjustment governor, The pressure regulating device according to claim 8.

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