Pressure adjustment device

Abstract

To provide a pressure adjustment device which can avoid a situation where drainage is re-mixed into steam and allow a user to check failure in discharge of the drainage easily and reliably even if the failure in discharge of the drainage occurs.SOLUTION: Steam flowing from an inflow passage 32 is decompressed by a decompression mechanism 2a to be sent from an outflow passage 34. At the same time, drainage is separated from the steam by a drainage separation mechanism 2b and dropped into a trap valve chamber 28 to accumulate. During normal operation, a float 16 goes up as the drainage accumulates to open an orifice 21 of a trap valve seat 20 to discharge the drainage. When clogging occurs in the orifice 21, the system becomes unable to discharge the drainage. In this case, the float 16 is guided by a guide cylinder 5 and keeps going up to contact with a packing 4 fixed to a lower end of a separator 42 and blocks flow of steam.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The pressure regulating device of the present application is a device that adjusts pressure, such as by reducing the pressure of a target fluid such as steam, and relates to technology for a pressure regulating device that separates a liquid phase, such as drain, from the target fluid and automatically discharges this separated liquid phase. [Background technology]

[0002] In industrial plants where products are manufactured, high-pressure steam generated in a boiler is transported to a specific processing device and used to manufacture products. In such cases, since the generated steam is at high pressure, it is necessary to reduce the pressure of the steam so that it becomes suitable for the device that uses it.

[0003] In addition, in food manufacturing lines, high-temperature steam is sometimes sprayed directly onto food for processing. If drainage is mixed into this steam, it may cause a deterioration in the quality of the food, so it is necessary to separate the drainage from the steam and generate dry steam with a high degree of dryness before spraying it onto the food.

[0004] For this reason, some pressure reducing devices that reduce the pressure of steam have a gas-liquid separation mechanism. Pressure reducing devices with a gas-liquid separation mechanism are connected to the steam transport piping, reduce the pressure of the steam they take in, separate condensate from the steam, and send out dry steam. Some devices also have an automatic discharge mechanism to automatically discharge the condensate separated by the gas-liquid separation mechanism to the outside of the device.

[0005] An example of an apparatus equipped with such a pressure reducing mechanism, a gas-liquid separation mechanism, and an automatic discharge mechanism is a condensate separator and discharger disclosed in the below-mentioned Patent Document 1. This condensate separator and discharger reduces the pressure of steam at primary steam pressure that flows in from an inlet 4 using a pressure reducing valve unit 1, and sends out the reduced pressure steam at secondary steam pressure from an outlet 5.

[0006] This condensate separator / discharger also performs gas-liquid separation at the same time as reducing the pressure of the steam. That is, the steam flowing in from the inlet 4 is guided to the steam inlet passage 34, which acts as a separator formed around the cylindrical body 21, and swirled violently. This swirling separates the drainage (condensate) contained in the steam by centrifugal separation. The dry steam from which the drainage has been separated enters the cylinder 24 from the opening at the bottom end of the cylindrical body 21, and is sent out from the delivery port 5 in a reduced pressure state to be used for food processing, etc.

[0007] The condensate separated from the steam by the centrifugal separation drips down along the inner wall of the steam trap 2 located below the steam inlet passage 34, and accumulates at the bottom of the steam trap 2. A float 27 is provided in the steam trap 2 so that it can float, and rises as the condensate accumulates, and the float 27 separates from the trap valve seat 26 to open the discharge hole. This allows the accumulated condensate to be automatically discharged from the discharge hole. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 62-67397 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the technique disclosed in the above-mentioned Patent Document 1, if the discharge hole of the steam trap 2 becomes clogged and poor discharge of the condensate occurs, there is a risk that the condensate will re-mix with the steam.

[0010] That is, if foreign matter such as dirt and scale adheres to and accumulates in the discharge hole formed in the trap valve seat 26 of the steam trap 2, completely blocking the discharge hole, a discharge failure in which the condensate is not discharged may occur. If the condensate accumulates at the bottom of the steam trap 2 and the water level gradually rises until it reaches the lower end of the cylindrical body 21, the accumulated condensate may be caught up in the dry steam swirling along the steam introduction passage 34 formed around the cylindrical body 21 and remixed into the steam.

[0011] Furthermore, in the technique disclosed in Patent Document 1, it is difficult to easily recognize from the outside that drainage has been improperly performed and that drain has remixed into the steam.

[0012] Therefore, the pressure regulating device of the present application provides a pressure regulating device that prevents the drain from being mixed back into the steam even if the drain is not properly discharged, and that can easily and reliably confirm whether the drain is not properly discharged. [Means for solving the problem]

[0013] The pressure regulating device according to the present application is a pressure adjustment mechanism that takes in a target fluid having a gas phase and a liquid phase mixed therein and adjusts the pressure of the target fluid, a gas-liquid separation mechanism that separates the liquid phase from the target fluid, and an automatic discharge mechanism that is disposed below and communicates with the gas-liquid separation mechanism and discharges the separated liquid phase to the outside; A pressure regulating device comprising: The gas-liquid separation mechanism includes: an inlet portion through which the target fluid flows in, and an outlet portion through which the target fluid flows out; a passageway that communicates the inlet portion and the outlet portion and allows the target fluid to pass through; Equipped with The automatic discharge mechanism includes: A valve chamber where the separated liquid phase accumulates; a valve port portion that communicates the valve chamber portion with the outside; a floating opening / closing means that is disposed in the valve chamber and floats in response to the amount of liquid phase retained; Equipped with the floating opening / closing means closes the valve opening when the amount of liquid phase remaining in the valve chamber is a normal valve closing reference amount, the floating opening / closing means opens the valve opening when the amount of liquid phase remaining in the valve chamber reaches a normal opening reference amount that is greater than the normal closing reference amount, the floating opening / closing means closes the passage provided in the gas-liquid separation mechanism when the amount of liquid phase remaining in the valve chamber reaches an abnormal limit reference amount that is greater than the normal valve opening reference amount. It is characterized by: Effect of the Invention

[0014] In the pressure regulating device according to the present application, the floating opening / closing means closes the passageway of the gas-liquid separation mechanism when the amount of liquid phase remaining in the valve chamber reaches an abnormal limit reference amount that is greater than the normal valve opening reference amount. Therefore, when the valve opening is clogged and a discharge failure occurs in which the liquid phase cannot be discharged, and the amount of liquid phase remaining in the valve chamber reaches an abnormal limit reference amount that is greater than the normal valve opening reference amount, the floating opening / closing means closes the passageway of the gas-liquid separation mechanism.

[0015] In this way, the floating opening and closing means blocks the passageway of the gas-liquid separation mechanism, so the liquid phase remaining in the valve chamber does not mix with the target fluid passing through the passageway. Therefore, even if the liquid phase is not properly discharged, it is possible to prevent the liquid phase from remixing with the target fluid.

[0016] In addition, since the floating opening and closing means blocks the passage through the gas-liquid separation mechanism, the target fluid is prevented from flowing out from the outlet. Therefore, by detecting the cessation of outflow of the target fluid from the outlet, it is possible to easily and reliably confirm the failure of the liquid phase to be discharged. [Brief description of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing an overall configuration of a pilot type pressure reducing valve 2 illustrating a first embodiment of a pressure regulating device according to the present application. [Diagram 2]FIG. 2 is an enlarged cross-sectional view showing a drain separation mechanism 2b and a steam trap mechanism 2c in the pilot pressure reducing valve 2 shown in FIG. 1, in a normally closed state. [Diagram 3] FIG. 2 is an enlarged cross-sectional view showing a drain separation mechanism 2b and a steam trap mechanism 2c in the pilot pressure reducing valve 2 shown in FIG. 1, illustrating a normal open state. [Figure 4] FIG. 2 is an enlarged cross-sectional view showing the drain separation mechanism 2b and the steam trap mechanism 2c in the pilot pressure reducing valve 2 shown in FIG. 1, illustrating a shutoff state when clogging occurs. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] [Terminology used in the embodiments] The main terms used in the embodiments correspond to the following elements of the pressure regulating device according to the present application.

[0019] Pilot operated pressure reducing valve 2... Pressure regulating device Pressure reducing mechanism 2a: Pressure adjusting mechanism Drain separation mechanism 2b: Gas-liquid separation mechanism Steam trap mechanism 2c...Automatic discharge mechanism Packing 4: Blocking sealing means Guide tube 5: Guide means Wall cylinder 5a...Lower guide part Mesh cylinder 5b: Upper mesh guide section Float 16... Floating opening and closing means Orifice 21: Valve section Trap valve chamber 28 ··· Valve chamber section Inflow path 32...Inflow port Outflow channel 34... Outlet part Around and inside the separator 42, the gap between the main valve seat 55 and the main valve 51, and the passage Tapered surface 43...connecting part Drain retention volume at level 81: Normal valve closing reference volume Drain retention volume at level 82: Standard amount for normal valve opening Drain retention level of 83: Abnormal limit standard amount Dry steam...gas phase Water (drain)...liquid phase Steam...Target fluid

[0020] [First embodiment] A first embodiment of a pressure regulating device according to the present application will be described. In this embodiment, an example in which the pressure regulating device according to the present application is applied to a pilot type pressure reducing valve will be described. Fig. 1 is a cross-sectional view showing the overall configuration of a pilot type pressure reducing valve 2 in this embodiment.

[0021] (1) Description of the overall configuration of the pilot pressure reducing valve 2 Industrial plants are generally equipped with piping systems that transport steam generated in boilers at high temperature and pressure to the destination. Pilot pressure reducing valves are installed in the piping systems to reduce and adjust the pressure of this generated steam to a level that meets the operating conditions of the destination equipment.

[0022] The pilot type pressure reducing valve 2 in this embodiment is provided with a pressure reducing mechanism as a pressure adjustment mechanism, a drain separation mechanism as a gas-liquid separation mechanism, and a steam trap mechanism as an automatic discharge mechanism. Part 2a shown in Fig. 1 is mainly a configuration related to the pressure reducing mechanism, part 2b is mainly a configuration related to the drain separation mechanism, and part 2c is mainly a configuration related to the steam trap mechanism.

[0023] 1, a separator body 12 is fixed by bolts to the open lower end of a body 10 of the pilot type pressure reducing valve 2, and the open lower end of this separator body 12 is closed by a trap cover 14. In addition, a pilot body 60 is fixed by bolts to the open upper end of the body 10, and a spring case 75 is further fixed by bolts to the open upper end of this pilot body 60.

[0024] An inlet passage 32 that communicates with the internal space of the body 10 is formed on one side of the body 10, and this inlet passage 32 is connected to the primary side piping through which steam flows in. In addition, an outlet passage 34 that communicates with the internal space of the body 10 is formed on the other side of the body 10, and this outlet passage 34 is connected to the secondary side piping. The inlet passage 32 and the outlet passage 34 are arranged coaxially.

[0025] A separator 42 having a generally cylindrical shape and five rotating blades on its circumferential surface is disposed in the internal space of the body 10. Each of the five rotating blades of the separator 42 has a gently sloping wall on one side.

[0026] The opening at the bottom end of the separator 42 is formed as a tapered surface 43 whose inner diameter widens downward. A ring-shaped packing 4 is fixed to the upper part of this tapered surface 43. The inner surface of the packing 4 is formed as a packing tapered surface 4a (FIG. 2) whose inner diameter widens downward. A screen 40 is attached to the outside of the separator 42.

[0027] A trap valve seat 20 having an orifice 21 formed therein is attached to the trap cover 14 that closes the open lower end of the separator body 12. Furthermore, a drain port 22 is formed in the trap cover 14 facing downward, and a trap valve chamber 28, which is the internal space of the separator body 12, and the drain port 22 are in communication with each other via the orifice 21.

[0028] Furthermore, a hollow float 16 is housed in the trap valve chamber 28 so that it can float. Under normal circumstances, the float 16 is seated on the float support portion 26 and the trap valve seat 20 due to its own weight, thereby closing the orifice 21.

[0029] A cylindrical guide tube 5 is provided in the trap valve chamber 28 to cover the float 16, and the float 16 floats while being guided in the internal space of the guide tube 5. The guide tube 5 is composed of a lower wall cylinder 5a and an upper mesh cylinder 5b. The wall cylinder 5a is made of a metal plate, and the mesh cylinder 5b is made of a mesh material with many meshes. The wall cylinder 5a and the mesh cylinder 5b are fixed together and integrated, and the lower part of the wall cylinder 5a is fixed to the trap cover 14 by a bolt 9.

[0030] In this embodiment, the guide tube 5 is disposed so that the opening at the upper end of the mesh cylinder 5b is close to the tapered surface 43 at the lower end of the separator 42. The guide tube 5 may be disposed so that the opening at the upper end of the mesh cylinder 5b abuts against the tapered surface 43 at the lower end of the separator 42.

[0031] The body 10 is provided with a main valve seat 55. The main valve seat 55 has a through hole along the central axis L1 of the body 10, and communicates the internal space of the separator 42 with the outflow path 34. A main valve 51 is disposed below the main valve seat 55 so as to be movable in the direction of the central axis L1, and the main valve 51 is constantly pressurized in an upward direction so as to come into contact with the main valve seat 55 by the force of a small spring 52. With the valve mechanism formed by the main valve seat 55 and the main valve 51 as the base point, the separator 42 side is the primary side, and the outflow path 34 side is the secondary side.

[0032] A cylinder 59 formed in the body 10 is positioned above the main valve seat 55, and a piston 57 is disposed in this cylinder 59 along the central axis L1. The piston 57 crosses the outflow passage 34 and further passes through a through hole in the main valve seat 55, with the lower end of the piston 57 abutting against the main valve 51. The piston 57 is held in the cylinder 59 so as to be able to move up and down, and when the piston 57 moves down, the lower end of the piston 57 presses down the main valve 51 against the biasing force of the small spring 52. That is, the main valve 51 moves in response to the movement of the piston 57 up and down, and the opening of the main valve seat 55 is adjusted.

[0033] A pilot valve seat 67 is provided on the upper part of the pilot body 60, and a pilot valve 63 passes through the pilot valve seat 67 along a central axis L1. The pilot valve 63 is constantly pressurized in the upward direction by the bias of a pilot spring 65.

[0034] The space in which the pilot valve 63 is disposed communicates with the inflow passage 32 via a primary bypass 61. The steam that flows into the primary bypass 61 through the inflow passage 32 passes through a screen 66, and scale and the like mixed in the steam are captured by the screen 66. The space in which the pilot valve 63 is disposed also communicates with the space of the cylinder 59 formed on the upper surface side of the piston 57 via a pilot bypass 68.

[0035] A diaphragm 72 is provided at the upper opening of the pilot body 60, and the upper end surface of the pilot valve 63 abuts against the diaphragm 72. An adjustment spring 71 is housed in a spring case 75 and presses the diaphragm 72 downward.

[0036] An adjustment screw 77 is screwed into the upper part of the spring case 75, and the operation head protrudes from the spring case 75. By screwing in the adjustment screw 77, it is possible to adjust the pressing force of the adjustment spring 71 against the diaphragm 72. The protruding head of the adjustment screw 77 is covered by a cap 78 that is detachable from the spring case 75. The space below the diaphragm 72 communicates with the outflow path 34 via the secondary side bypass 62.

[0037] The cap 78, the adjustment screw 77, the adjustment spring 71, the pilot valve seat 67, the pilot valve 63, the pilot spring 65, the cylinder 59, the piston 57, the main valve seat 55, the main valve 51, the small spring 52, the separator 42, the gasket 4, and the guide tube 5 are each arranged so that their center lines coincide with the central axis L1.

[0038] (2) Explanation of normal operation of pilot pressure reducing valve 2 Next, a description will be given of normal operation of the pilot type pressure reducing valve 2. High pressure steam transferred through the primary side piping flows from the inflow passage 32 into the body 10 along the direction of the arrow 91, and passes through the screen 40. Since the screen 40 is made of a mesh member, foreign matter such as scale and dust mixed in the steam is captured as it passes through the screen 40.

[0039] (2-1) Vapor pressure reduction operation The steam that has permeated screen 40 swirls around the outer periphery of separator 42 along the cylindrical shape, is guided to the inclined walls formed on each rotary vane, and rotates around separator 42 in a spiral direction (the direction of arrow 92) at high speed several times. The steam that has swirled around separator 42 enters separator 42 from an opening at the lower end of separator 42 along the direction of arrow 93. The steam then passes through the gap between main valve seat 55 and main valve 51, which makes the steam pressure on the secondary side lower than the steam pressure on the primary side, and the reduced pressure steam flows out of outlet passage 34 along the direction of arrow 94.

[0040] The reduced secondary steam pressure can be freely adjusted and set. To adjust the reduced pressure, first remove the cap 78 and then screw in the adjustment screw 77 to change the biasing force of the adjustment spring 71 applied to the diaphragm 72 and adjust the opening of the pilot valve seat 67. This changes the primary steam pressure applied to the top surface of the piston 57 through the primary bypass 61 and pilot bypass 68, and the piston 57 moves up and down accordingly, controlling the opening of the main valve seat 55 and setting the secondary steam pressure to the desired pressure.

[0041] That is, by screwing in the adjusting screw 77 and adjusting the opening of the pilot valve seat 67 to be larger, the steam pressure applied to the top surface of the piston 57 increases, and accordingly the piston 57 moves down, the opening of the main valve seat 55 increases, and the secondary steam pressure is set high. Conversely, by screwing in the adjusting screw 77 and adjusting the opening of the pilot valve seat 67 to be smaller, the steam pressure applied to the top surface of the piston 57 decreases, and accordingly the piston 57 moves up under the biasing force of the small spring 52, the opening of the main valve seat 55 decreases, and the secondary steam pressure is set low.

[0042] Incidentally, the pressure fluctuation of the high pressure steam on the primary side is relatively large, but the secondary side steam pressure after pressure reduction must be kept as stable as possible before being sent out from the pilot pressure reducing valve 2. For this reason, the secondary side steam pressure is applied to the diaphragm 72 from the outlet path 34 through the secondary side bypass 62, and the set pressure is maintained by automatic pressure adjustment through feedback.

[0043] For example, if the secondary steam pressure falls below the set pressure, the reduced secondary pressure acts on diaphragm 72 through secondary bypass 62, and diaphragm 72 is pushed downward by the biasing force of adjustment spring 71. Accordingly, pilot valve 63 descends against the biasing force of pilot spring 65, and the opening of pilot valve seat 67 increases. This increases the flow rate of primary steam that wraps around the top surface of piston 57, and main valve 51 descends against the biasing force of small spring 52. In response to this descent of main valve 51, the opening of main valve seat 55 increases, and the secondary steam pressure rises to recover the set pressure.

[0044] Conversely, when the secondary steam pressure becomes higher than the set pressure, the diaphragm 72 is pushed up, the pilot valve 63 rises under the urging force of the pilot spring 65, and the opening of the pilot valve seat 67 becomes smaller. This reduces the flow rate of primary steam that wraps around the top surface of the piston 57, and the main valve 51 rises under the urging force of the small spring 52. In response to this rise of the main valve 51, the opening of the main valve seat 55 becomes smaller, causing the secondary steam pressure to drop and recover to the set pressure.

[0045] (2-2) Gas-liquid separation operation As described above, the steam that flows in from inflow channel 32 in the direction of arrow 91 rotates several times in a spiral direction (in the direction of arrow 92) around separator 42. This generates a centrifugal force on the flowing steam, and a larger centrifugal force acts on water, which has a high specific gravity.

[0046] As a result, the drain mixed in the steam is thrown outward by centrifugal force and separated from the steam. This separation of the drain removes water from the steam, and dry steam is sent out from the outlet 34. The drain thrown outward by centrifugal force turns into water droplets that adhere to the inner walls of the body 10 and the separator body 12 and flow down the inner walls to the bottom of the trap valve chamber 28.

[0047] (2-3) Automatic drain discharge operation In the initial state, the float 16 sits on the trap valve seat 20 due to its own weight, blocking the orifice 21 formed in the trap valve seat 20. Therefore, water droplets that are separated from the steam and flow down to the bottom of the separator body 12 accumulate as drain at the bottom of the trap valve chamber 28. Figure 2 shows the closed state of the steam trap mechanism 2c at this time, and when only a small amount of drain is accumulated and the water level is at level 81, the float 16 blocks the orifice 21 formed in the trap valve seat 20.

[0048] As steam passes through the pilot pressure reducing valve 2, the amount of condensate remaining in the trap valve chamber 28 gradually increases, and in response, the float 16 rises in the direction of the arrow 95. Then, as shown in the open valve state in Figure 3, when the condensate water level reaches level 82, the float 16 leaves the trap valve seat 20 and opens the orifice 21 formed in the trap valve seat 20.

[0049] As a result, the accumulated drain is forced by the force of the high pressure in the piping system to pass through the orifice 21 to the drain port 22 and is discharged in the direction of the arrow 96. After being discharged, the drain water level drops, and the float 16 also drops accordingly. When the water level reaches level 81, the float 16 returns to the closed valve position shown in FIG. 2 and closes the orifice 21 of the trap valve seat 20.

[0050] As described above, the float 16 rises or falls according to the drain water level, and reciprocates between the closed valve state in Fig. 2 and the open valve state in Fig. 3, repeatedly opening and closing the orifice 21 to appropriately discharge the drain. Note that since the orifice 21 is always submerged, there is no steam leakage from the orifice 21. As described above, the steam that flows into the pilot pressure reducing valve 2 from the inlet passage 32 is sent to the secondary side from the outlet passage 34 as reduced-pressure dry steam due to separation of the drain and reduction in pressure.

[0051] (3) Explanation of operation when the steam trap mechanism 2c is clogged Next, a description will be given of the operation when a blockage occurs in the steam trap mechanism 2c of the pilot pressure reducing valve 2. As described above, the steam flowing in from the inlet 32 ​​permeates the screen 40, and foreign matter such as scale and dirt mixed in the steam is captured by the screen 40, but fine foreign matter permeates the screen 40 and enters the pilot pressure reducing valve 2.

[0052] Such foreign matter is separated from the steam together with the condensate by the condensate separation mechanism 2b, drips together with water droplets to the bottom of the trap valve chamber 28, and adheres to and accumulates on the orifice 21 formed in the trap valve seat 20. This can cause clogging of the orifice 21 of the steam trap mechanism 2c, resulting in discharge failure in which the condensate cannot be discharged. In particular, clogging often occurs because the diameter of the orifice 21 is small so that it can be reliably blocked by the outer circumferential surface of the spherical float 16.

[0053] If the orifice 21 becomes clogged and drainage becomes poor, the drain cannot be discharged from the drain port 22 even if the float 16 rises to the surface. This causes an increase in the amount of drainage remaining in the trap valve chamber 28, and the drain water level shown in Figure 3 rises further from level 82, eventually reaching level 83 shown in Figure 4.

[0054] As the drain water level rises, the float 16 rises, guided by the internal space of the guide tube 5. Because the inner diameter of the guide tube is set slightly larger than the diameter of the float 16, the float 16 rises in an approximately straight line in the direction of arrow 95. The float 16 then enters the tapered surface 43 at the bottom end of the separator 42 and comes into contact with the ring-shaped packing 4 fixed to the tapered surface 43, stopping its rise. Figure 4 shows the limit of the float 16's rise.

[0055] In this way, the float 16 abuts against the packing 4 and closes the opening at the lower end of the separator 42, thereby blocking the flow of steam entering from the opening at the lower end of the separator 42 in the direction of the arrow 93 (FIG. 1), and the outflow of steam from the outlet 34 is stopped. In this embodiment, the float 16 abuts against the packing 4 also blocks communication between the steam flow path and the trap valve chamber 28. Therefore, if a blockage occurs in the steam trap mechanism 2c of the pilot pressure reducing valve 2, it is possible to prevent a situation in which steam with condensate re-mixed therein is sent to the secondary side from the outlet 34.

[0056] In addition, by stopping the outflow of steam from the outlet 34, it is possible to know from the outside that a blockage has occurred in the steam trap mechanism 2c of the pilot pressure reducing valve 2, and it is possible to easily and reliably confirm the failure of drain discharge. By recognizing the occurrence of a blockage, the orifice 21 of the trap valve seat 20 is cleaned and foreign matter adhering to the orifice 21 is removed.

[0057] As described above, the opening at the bottom end of the separator 42 is formed as a tapered surface 43 whose inner diameter increases downward. Therefore, if a blockage occurs in the steam trap mechanism 2c, the float 16 is guided by the tapered surface 43 and can smoothly enter the opening at the bottom end of the separator 42.

[0058] As described above, the inner surface of the ring-shaped packing 4 fixed to the tapered surface 43 is formed as the packing tapered surface 4a, the inner diameter of which increases downward. In other words, the packing tapered surface 4a is inclined in a direction along the outer circumferential spherical surface of the float 16, so that the outer circumferential spherical surface of the float 16 and the packing tapered surface 4a can be brought into closer contact with each other more reliably, thereby blocking the flow of steam.

[0059] As described above, the upper part of the guide cylinder 5 is configured by the mesh cylinder 5b made of a mesh material. Therefore, during normal operation of the pilot type pressure reducing valve 2 (FIGS. 2 and 3), the flow of steam entering from the opening at the lower end of the separator 42 in the direction of the arrow 93 (FIG. 1) can pass through the mesh part of the mesh cylinder 5b and does not impede the flow of steam in the direction of the arrow 93.

[0060] Furthermore, as described above, the wall cylinder 5a at the bottom of the guide cylinder 5 is made of a metal plate and not a mesh material, so that it can withstand the collisions caused by the rising and falling of the float 16 during normal operation, ensuring the strength of the guide cylinder 5. In another embodiment, the entire guide cylinder 5 can be made of a mesh material.

[0061] [Other embodiments] In the above-described embodiment, specific configurations are shown for each of the gas phase, liquid phase, target fluid, pressure adjustment mechanism, gas-liquid separation mechanism, automatic discharge mechanism, inlet section, outlet section, passage, valve chamber section, valve opening section, floating opening / closing means, normally closed valve reference amount, normally open valve reference amount, abnormal limit reference amount, guide means, lower guide section, and upper mesh guide section of the pressure adjustment device of the present application, but these are merely examples, and different configurations can also be adopted for each.

[0062] That is, in the above-described embodiment, a pilot type pressure reducing valve 2 is exemplified as a pressure adjusting device, but the pressure adjusting device of the present application can also be applied to other devices as long as they are equipped with a pressure adjusting mechanism (pressure reducing mechanism 2a, etc.), a gas-liquid separation mechanism (drain separation mechanism 2b, etc.), and an automatic discharge mechanism (steam trap mechanism 2c, etc.).

[0063] In the above embodiment, a pressure reducing mechanism that reduces the pressure of the target fluid (steam, etc.) is exemplified as the pressure adjusting mechanism, but a mechanism that increases the pressure of the target fluid or a mechanism that stabilizes the pressure of the target fluid may also be adopted. In addition, steam containing drain is exemplified as the target fluid containing a liquid phase, but a fluid other than steam may be the target.

[0064] In the above embodiment, the packing 4 having the packing tapered surface 4a is exemplified as the blocking seal means, but a blocking seal means having a different shape may be used. For example, a packing having a circular or nearly circular cross section or a nearly rectangular cross section may be used as the blocking seal means.

[0065] Furthermore, in the above-described embodiment, the float 16 is exemplified as the floating opening and closing means, but other shapes and structures may be used as long as they are disposed in the valve chamber (trap valve chamber 28, etc.) and float according to the amount of accumulated liquid phase (drain, etc.). For example, a disk-shaped valve body may be used as the floating opening and closing means.

[0066] In addition, in the above-described embodiment, a cylindrical guide tube 5 composed of a wall tube 5a and a mesh tube 5b was exemplified as a guide means, but a different shape and configuration may be adopted as long as it guides the floating of the floating opening / closing means (float 16, etc.) according to the amount of accumulated liquid phase (drain, etc.). [Explanation of symbols]

[0067] 2: Pilot pressure reducing valve 2a: Pressure reducing mechanism 2b: Drain separation mechanism 2c: Steam trap mechanism 4: Packing 5: Guide tube 5a: Wall tube 5b: Mesh cylinder 16: Float 21: Orifice 28: Trap valve chamber 32: inlet passage 34: outlet passage 42: separator 43: tapered surface 51: Gap to main valve 55: Main valve seat 81, 82, 83: Level

Claims

1. a pressure adjustment mechanism that takes in a target fluid having a gas phase and a liquid phase mixed therein and adjusts the pressure of the target fluid, a gas-liquid separation mechanism that separates the liquid phase from the target fluid, and an automatic discharge mechanism that is disposed below and communicates with the gas-liquid separation mechanism and discharges the separated liquid phase to the outside; A pressure regulating device comprising: The gas-liquid separation mechanism includes: an inlet portion through which the target fluid flows in, and an outlet portion through which the target fluid flows out; a passageway that communicates the inlet portion and the outlet portion and allows the target fluid to pass through; It is equipped with The automatic discharge mechanism includes: A valve chamber where the separated liquid phase accumulates; a valve port portion that communicates the valve chamber portion with the outside; a floating opening / closing means that is disposed in the valve chamber and floats in response to the amount of liquid phase retained; It is equipped with the floating opening / closing means closes the valve opening when the amount of liquid phase remaining in the valve chamber is a normal valve closing reference amount, the floating opening / closing means opens the valve opening when the amount of liquid phase remaining in the valve chamber reaches a normal opening reference amount that is greater than the normal closing reference amount, the floating opening / closing means closes the passage provided in the gas-liquid separation mechanism when the amount of liquid phase remaining in the valve chamber reaches an abnormal limit reference amount that is greater than the normal valve opening reference amount. A pressure regulating device characterized by:

2. 2. The pressure regulating device according to claim 1, when the amount of liquid phase remaining in the valve chamber reaches an abnormal limit reference amount, the floating opening / closing means abuts against a communicating portion between the liquid separation mechanism and the automatic discharge mechanism to block the passage provided in the gas-liquid separation mechanism, The communication portion is provided with a blocking seal means with which the floating opening / closing means abuts. A pressure regulating device characterized by:

3. In the pressure regulating device according to claim 1 or 2, The automatic discharge mechanism includes a guide means for guiding the floating of the floating opening / closing means in accordance with the amount of the liquid phase retained. A pressure regulating device characterized by:

4. In the pressure regulating device according to claim 3, The guide means includes a lower guide portion made of a non-mesh material, and an upper guide portion made of a mesh material and positioned contiguous to an upper portion of the lower guide portion. A pressure regulating device characterized by:

Images