Automatic valve device

Abstract

To provide an automatic valve device that allows for easy replacement and maintenance of the automatic valve mechanism, and that enables easy and reliable discharge of fluids such as drain during such work. [Solution] In the normal operation of the trap device 1, the drain that flows in from the inlet 41 is discharged from the outlet 42 along arrows 101, 102, 103, and 104. In contrast, when replacing or maintaining the trap section 8 while the trap device 1 remains connected to the piping system, the valve stem 20 is rotated to move the valve body 21 to the limit position in the direction of arrow 91, thereby closing the valve. At this time, the small diameter portion 23 of the valve stem 20 is located on the line connecting the axis of the first bypass passage 51 and the axis of the second bypass passage 52, allowing the drain to flow from the first bypass passage 51 to the second bypass passage 52. Therefore, even when the valve body 21 is in the closed position, the drain can be reliably discharged.

Description

Technical Field

[0001] The automatic valve device according to the present application relates to the configuration of an automatic valve device that automatically discharges fluids such as drain generated from steam.

Background Art

[0002] As an automatic valve device, there is a steam trap that automatically discharges drain generated in a steam transfer piping system. Patent Document 1 below describes a steam trap that, in addition to this drain discharge function, has a blowdown function of exhausting by ventilation under high pressure during steam transfer after regular maintenance. This trap 1 is composed of a main body 10, a trap section 30, a valve section 50, etc.

[0003] When the trap 1 executes the drain discharge function, the valve body 52 is positioned in the closed valve state, blocking the flow path from the first bypass flow path 17 to the second bypass flow path 18. As a result, a fluid such as steam flowing in from the inlet 11 passes through the first common passage 14, the first trap flow path 15, and flows into the valve chamber 36. Then, the drain in the valve chamber 36 is discharged from the discharge port 12 through the orifice 391, the discharge path 37, the second connection path 35, and the second trap flow path 16 according to the operation of the float 38.

[0004] Also, when the trap device 1 executes the blowdown function, the valve body 52 is positioned in the open valve state to open the flow path from the first bypass flow path 17 to the second bypass flow path 18, and most of the fluid such as steam flowing in from the inlet 11 is passed through the first common passage 14, the first bypass flow path 17, and the second bypass flow path 18 and discharged from the discharge port 12. When the valve body 52 is positioned in the open valve state, if it is adjusted to a minute opening degree, the flow of the fluid such as steam becomes faster than in the fully open case, and scale etc. adhering to the valve seat 53 can be removed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in the technology disclosed in Patent Document 1, it is not possible to remove and replace or maintain only the trap section 30 while the trap 1 is connected to the piping system. The trap section 30 operates by repeatedly opening and closing the float 38 in accordance with the amount of drain flowing in, so deterioration such as wear and damage often occurs over time. For this reason, it is necessary to replace or maintain only the trap section 30 while the trap 1 is connected to the piping system, but it is difficult to interrupt the flow of drain to the trap section 30 in the technology disclosed in Patent Document 1.

[0007] Therefore, a manual valve or the like, installed separately upstream of trap 1, must be operated to stop the flow of steam and drain to trap 1, and the trap section 30 must be replaced or maintained. However, in this case, while the replacement or maintenance work is being carried out, it becomes impossible to discharge initial air etc. by blowdown, which disrupts the operation of the piping system.

[0008] Therefore, the objective of the present invention is to provide an automatic valve device that allows for easy replacement and maintenance of the automatic valve mechanism, such as the trap section 30, and that can easily and reliably discharge initial air, drain, and other fluids during such work. [Means for solving the problem]

[0009] The automatic valve device relating to this application is A body through which a target fluid flows, having an inlet into which the target fluid enters, a communication channel communicating with the inlet, and an outlet outlet into which the target fluid exits. An automatic valve mechanism detachably provided to the main body, which operates in response to the target fluid flowing in through the communication channel and automatically discharges the target fluid. An on / off valve mechanism provided in the main body, wherein the on / off valve mechanism is provided so as to be displaceable between an open basic state in which communication between the inlet and the communication passage is opened, and a closed basic state in which communication between the inlet and the communication passage is closed. An automatic valve device equipped with, The main body is provided with an auxiliary channel that connects the inlet and outlet sections. The on / off valve mechanism closes the auxiliary passage when it is in the open basic state, and opens the auxiliary passage when it is in the closed basic state. It is characterized by the following: [Effects of the Invention]

[0010] In the automatic valve device according to the present invention, the opening and closing valve mechanism is displaceable between an open basic state, which opens the communication between the inlet and the communication passage, and a closed basic state, which closes the communication between the inlet and the communication passage. Therefore, by displacing the opening and closing mechanism to the closed basic state, the communication between the inlet and the communication passage can be closed, and the inflow of the target fluid into the automatic valve mechanism can be interrupted. For this reason, the automatic valve mechanism can be removed from the main body, making it easy to perform tasks such as replacing the automatic valve mechanism and maintenance.

[0011] Furthermore, the valve mechanism closes the auxiliary passage when it is in the open basic state and opens the auxiliary passage when it is in the closed basic state. Therefore, by opening the auxiliary passage when the automatic valve mechanism is in the closed basic state, even while work such as replacement or maintenance of the automatic valve mechanism is being performed in the closed basic state, the target fluid can be passed through the auxiliary passage from the inlet to the outlet, allowing for easy and reliable discharge of the target fluid. [Brief explanation of the drawing]

[0012] [Figure 1] This is an overall cross-sectional view showing a trap device 1, which is a first embodiment of the automatic valve device according to the present application. [Figure 2] Figure 1 is an enlarged cross-sectional view of the vicinity of the valve body 21, showing the valve in the open state. [Figure 3]An enlarged cross-sectional view near the valve body 21 shown in FIG. 1, which is an enlarged cross-sectional view showing the valve-closed state.

Mode for Carrying Out the Invention

[0013] [Term Explanation in the Embodiment] The main terms shown in the embodiment respectively correspond to the following elements of the automatic valve device according to the present application.

[0014] Trap device 1... Automatic valve device Valve part 2... Open / close valve mechanism Trap part 8... Automatic valve mechanism Valve body 21... Open / close part Valve body tip 22... Open / close inclined surface Small-diameter part 23... Auxiliary opening part Device main body 40... Main body Inlet 41 and main body first flow path 44... Inlet part Outlet 42... Outlet part First bypass flow path 51 and second bypass flow path 52... Auxiliary flow path Valve seat space 54... Open / close space Valve seat central flow path 55, main body central flow path 43 and connection central flow path 61... Communication flow path Tapered surface 55a... Inner wall inclined surface Drain... Target fluid Valve-open state (FIG. 2)... Open basic state Valve-closed state (FIG. 3)... Closed basic state

[0015] [First Embodiment] A first embodiment of the automatic valve device according to the present application will be described. In this embodiment, the trap device 1 is exemplified as the automatic valve device. The trap device 1 is connected to, for example, a piping system for steam transfer, and automatically discharges drain (condensate) generated by steam condensation to the outside of the piping system. The trap device 1 can be installed in a vertical pipe arranged in the vertical direction. In addition to such a normal drain discharge function, the trap device 1 also has a function of not interrupting the discharge of initial air and drain during the replacement or maintenance work of the trap section that automatically discharges the drain.

[0016] (Description of the configuration of the trap device 1) The trap device 1 mainly includes a device body 40, a trap section 8 connected to the front end side of the device body 40, and a valve section 2 connected to the rear end side of the device body 40. In the device body 40, an inlet 41 and an outlet 42 are formed coaxially in the vertical direction in the figure. Steam and drain flow into the trap device 1 from the inlet 41. The inlet 41 and the outlet 42 are cylindrical spaces. The inlet 41 is further communicated with a main body first flow path 44 formed as a cylindrical space coaxially.

[0017] A cylindrical main body valve seat 50 is attached to a recess provided in the device body 40 by screw connection from the lateral direction, and a valve seat space 54 is formed inside the main body valve seat 50. The valve seat space 54 is a cylindrical space, and its central axis is arranged to coincide with a reference line L1 which is a virtual line. The axes of the aforementioned inlet 41 and outlet 42 are orthogonal to the reference line L1. The rear end of the valve seat space 54 opens outward from the rear end surface 40b of the device body 40.

[0018] Furthermore, the main valve seat 50 has a valve seat passage 53 that connects the main body first passage 44 and the valve seat space 54, and the axis of this valve seat passage 53 is positioned perpendicular to the reference line L1. In addition, the main valve seat 50 has a valve seat central passage 55 formed along the reference line L1. Both the valve seat passage 53 and the valve seat central passage 55 are cylindrical spaces, and a tapered surface 55a is formed at the connection point between the two perpendicular passages, inclined in line with the inflow direction of steam and drain.

[0019] Furthermore, the main body 40 has a central channel 43 formed therein, such that its axis coincides with the reference line L1. One end of this central channel 43 communicates with the valve seat space 54 through the valve seat central channel 55, and the other end opens outward from the front surface 40a of the main body 40. The main body 40 also has a third channel 46 formed therein, which communicates with the outlet 42. The third channel 46 is also a cylindrical space, and its axis is positioned perpendicular to the reference line L1.

[0020] The main valve seat 50 has a cylindrical space, the first bypass channel 51, and the second bypass channel 52, formed coaxially in a direction perpendicular to the reference line L1. A valve seat space 54 is interposed between the first bypass channel 51 and the second bypass channel 52. The first bypass channel 51 connects the main channel 44 on the inlet 41 side to the valve seat space 54, and the second bypass channel 52 connects the main channel 36 on the outlet 42 side to the valve seat space 54. The first bypass channel 51 and the second bypass channel 52 are formed so as to be located on the rear end side of the valve seat channel 53 on the reference line L1.

[0021] Furthermore, a second main channel 45 is formed below the central channel 43 of the main body in Figure 1. One end of this second main channel 45 is in communication with the outlet 42, and the other end opens outward from the front surface 40a of the main body 40 of the device.

[0022] The trap section 8, which is connected to the front end surface 40a of the main body 40 of the device, is composed of a trap body 80 and a connecting joint 60. The trap body 80 and the connecting joint 60 are fixed together by welding. The trap body 80 has an internal space called a trap valve chamber 87.

[0023] Furthermore, the connecting joint 60 is integrally provided with a flange 65, and by fixing this flange 65 to the front end surface 40a of the device body 40 with bolts (not shown), the trap section 8 can be detachably attached to the device body 40. A gasket 69 is interposed between the front end surface 40a of the device body 40 and the connecting joint 60 to maintain airtightness within the trap device 1.

[0024] A cylindrical central connecting channel 61 is formed inside the connecting joint 60 such that its axis coincides with the reference line L1. One end of this central connecting channel 61 communicates with the central channel 43 of the main body of the device 40, and the other end opens towards and communicates with the trap valve chamber 87. A trap discharge passage 85 is formed at the bottom of the trap valve chamber 87. In addition, a trap valve seat 81 with an orifice 82 formed at its tip is provided near the bottom of the trap valve chamber 87, and the trap valve chamber 87 and the trap discharge passage 85 communicate through the internal space between the orifice 82 and the trap valve seat 81.

[0025] A float 89 is positioned within the trap valve chamber 87 so as to float freely. This float 89 has a hollow spherical shape and rises or falls according to the amount of drain flowing into the trap valve chamber 87. When the float 89 descends, its outer curved surface sits on the tip of the trap valve seat 81, closing the orifice 82. When the float 89 rises, its outer curved surface separates from the tip of the trap valve seat 81, opening the orifice 82. Two support pieces 83 are provided at the bottom of the trap valve chamber 87 to support the seating of the float 89 on the trap valve seat 81 and to guide the float 89's movement.

[0026] Furthermore, a bimetallic strip 84 is fixed to the bottom of the trap valve chamber 87 with bolts, and its tip contacts the bottom of the float 89. This bimetallic strip 84 is constructed by bonding together two materials with different expansion rates and curving them. By utilizing the difference in expansion rates of the materials, the bimetallic strip 84 deforms so that the opening of the curved portion increases when the temperature of the materials falls below a predetermined temperature, thereby lifting the float 89 from below. Figure 1 shows the state in which the bimetallic strip 84 has lifted the float 89. Conversely, when the temperature of the materials rises above the predetermined temperature from this state, the bimetallic strip 84 deforms so that the opening of the curved portion decreases, and it moves into a non-contact state that does not interfere with the float 89 (not shown).

[0027] The connecting connector 60 has a cylindrical connecting discharge passage 62 formed below the connecting central passage 61, parallel to the connecting central passage 61. One end of this connecting discharge passage 62 communicates with the main body second passage 45 formed in the device body 40, and the other end communicates with the trap discharge passage 85.

[0028] The valve section 2, which is connected to the rear end surface 40b of the device body 40, comprises a valve section body 30, which is fixed to the rear end surface 40b of the device body 40 by bolts. A gasket 39 is interposed between the valve section body 30 and the rear end surface 40b of the device body 40 to maintain airtightness within the trap device 1. The valve section body 30 has a cylindrical space formed therein, such that its axis coincides with the reference line L1, and both ends of this space are open toward the outside of the valve section body 30.

[0029] The valve stem 20 is positioned in the space of the valve body 30 such that its axis coincides with the reference line L1. The valve stem 20 has a substantially cylindrical shape, with a cross-section perpendicular to the reference line L1 being circular at all points in its main body. A threaded portion 25 is formed approximately in the center of the valve stem 20, and is screw-connected to a threaded portion formed on the inner circumferential surface of the space of the valve body 30. In other words, by rotating the valve stem 20, the valve stem 20 can be moved forward and backward along the reference line L1 in the directions of arrows 91 and 92.

[0030] Figures 1 and 2 show the valve stem 20 retracted to its limit position in the direction of arrow 92 (open valve state). The tip of the valve stem 20 is configured as the valve body 21. The circular outer diameter of this valve body 21 is approximately the same as the inner diameter of the valve seat space 54, and the tip 22 of the valve body 21 has a substantially conical shape that can contact the tapered surface 55a. The valve stem 20 also has a small-diameter portion 23 on the rear side of the valve body 21 that is continuous with the valve body 21. As shown in the figure, this small-diameter portion 23 is thinner than the valve body 21.

[0031] As shown in Figures 1 and 2, in the open state where the valve stem 20 is retracted to the limit position in the direction of arrow 92, the valve body 21 opens communication between the main body first passage 44 and the main body central passage 43, and at the same time, the valve body 21 interposes itself between the first bypass passage 51 and the second bypass passage 52, thereby blocking communication between the first bypass passage 51 and the second bypass passage 52.

[0032] Figure 3 shows the state in which the valve stem 20 has advanced to its limit position in the direction of arrow 91 (closed valve state). As shown in Figure 3, in the closed valve state in which the valve stem 20 has advanced to its limit position in the direction of arrow 91, the valve body 21 blocks communication between the main body first passage 44 and the main body central passage 43, and at the same time, the small-diameter portion 23 interposes between the first bypass passage 51 and the second bypass passage 52, thereby opening communication between the first bypass passage 51 and the second bypass passage 52.

[0033] The rear end of the valve stem 20 protrudes outward from the rear of the valve body 30. A packing 33 with a through hole is provided in the rear opening of the valve body 30, and the valve stem 20 is positioned to pass through this through hole in the packing 33. A retaining member 32 is screwed into the rear opening of the valve body 30, and tightening the retaining member 32 pressurizes the packing 33, maintaining airtightness within the trap device 1.

[0034] A fitting recess 29 is formed at the rear end of the valve stem 20 for rotating the valve stem 20. A cap 31 is attached to the rear of the valve body 30, covering the rear end of the valve stem 20. A wrench portion 34 is formed on the cap 31, and when the cap 31 is removed, this wrench portion 34 can be fitted into the fitting recess 29 of the valve stem 20, allowing the valve stem 20 to be rotated.

[0035] (Explanation of the normal operation of trap device 1) When the trap device 1 performs its normal operation to activate the trap section 8, it positions the valve body 21 of the valve stem 20 in the open position (Figures 1 and 2). That is, the wrench portion 34 of the cap 31 is fitted into the fitting recess 29 of the valve stem 20, and the valve stem 20 is rotated in the loosening direction to retract the valve stem 20 to its limit position in the direction of arrow 92. As a result, the valve body 21 opens the communication between the main body first passage 44 and the main body central passage 43, and at the same time closes the communication between the first bypass passage 51 and the second bypass passage 52.

[0036] When the piping system to which the trap device 1 is connected starts operating, the trap device 1 is filled with initial air, and the bimetal 84 provided in the trap valve chamber 87 of the trap section 8 reacts to the low temperature of the initial air by bending widely, lifting the float 89 and forcibly opening the orifice 82 of the trap valve seat 81 (Figure 1).

[0037] From this state, the piping system begins to pump steam, pushing out the initial air in the trap device 1. The air passes from the trap valve chamber 87 through the orifice 82, through the trap discharge passage 85, the connecting discharge passage 62, and the main body second flow path 45, and is discharged from the outlet 42 (in the directions of arrows 102, 103, and 104). After this, high-temperature steam and condensate flow in from the inlet 41 along the direction of arrow 102, and the temperature of the trap valve chamber 87 also rises. In response to this high temperature, the bimetal 84's curvature opens smaller, the contact between the bimetal 84 and the float 89 is released, and the bimetal 84 no longer interferes with the float 89 (not shown).

[0038] From this point onward, steam and condensate flow into the trap device 1, maintaining a high temperature. As a result, the bimetal 84 remains free from interference with the float 89 while the piping system is operating. With the bimetal 84 no longer interfering with the float 89, the float 89 settles down due to its own weight, blocking the orifice 82 of the trap valve seat 81. The trap device 1 then begins normal operation from this state.

[0039] As steam is pumped through the piping system, condensate is generated from the steam, and this condensate flows into the trap device 1 from the inlet 41 along the direction of arrow 101. In the open valve state shown in Figures 1 and 2, the communication between the main body first passage 44 and the main body central passage 43 is open, so the condensate flows from the main body first passage 44 through the valve seat passage 53, valve seat space 54 and valve seat central passage 55, and into the main body central passage 43. At this time, a tapered surface 55a is formed in the valve seat space 54 at the connection point between the valve seat passage 53 and the valve seat central passage 55, so the condensate flows smoothly along the tapered surface 55a.

[0040] The drain that flows into the central channel 43 of the main body passes through the central channel 61 of the connecting fitting 60 and flows into the trap valve chamber 87 of the trap section 8 along the direction of arrow 102. At this time, as described above, the float 89 is seated on the trap valve seat 81 and blocks the orifice 82, so the incoming drain remains in the trap valve chamber 87. This retention causes the drain water level in the trap valve chamber 87 to rise, causing the float 89 to float up and the orifice 82 to open.

[0041] As a result, the drain that had been accumulating in the trap valve chamber 87 flows rapidly in the direction of arrow 103 to the trap discharge passage 85, driven by the force of the high pressure in the piping. The drain that has flowed into the trap discharge passage 85 then passes through the connecting discharge passage 62 and the main body second flow path 45 in the direction of arrow 104, and is discharged from the outlet 42.

[0042] As the drain water is discharged, the water level of the condensate accumulating in the trap valve chamber 87 decreases, causing the float 89 to descend again and seat on the trap valve seat 81, closing the orifice 82 and shutting off the trap device 1. This shutting off prevents steam leakage. When condensate flows into the trap valve chamber 87 and accumulates, causing the water level of the condensate to rise again, the float 89 opens the orifice 82 and drains the condensate. Since the float 89 has a spherical shape, it can reliably close the orifice 82 with its outer surface regardless of how its orientation changes within the trap valve chamber 87.

[0043] As described above, the drain is intermittently discharged from the outlet 42 as the float 89 repeatedly rises or falls. During this operation, the water level of the drain accumulating in the trap valve chamber 87 fluctuates up and down, but since the orifice 82 is always submerged in the drain, leakage of steam being transported through the piping system is prevented, and steam loss can be avoided. Furthermore, when the valve is open, the valve body 21 blocks communication between the first bypass passage 51 and the second bypass passage 52, so no steam leakage occurs through the first bypass passage 51 and the second bypass passage 52.

[0044] (Explanation of operations when replacing the trap unit 8, etc.) The trap section 8 is a mechanism in which the float 89 floats according to the amount of drain flowing in, repeatedly opening and closing the orifice 82. Therefore, wear and tear or other deterioration due to aging often occurs on the float 89 and orifice 82. For this reason, it is necessary to replace or maintain only the trap section 8 while the trap device 1 is connected to the piping system.

[0045] As mentioned above, when the trap device 1 is operating normally, it is in the open valve state shown in Figure 2. However, when replacing or maintaining the trap section 8, the valve stem 20 is rotated to move the valve body 21 from the open valve state to the closed valve state shown in Figure 3. Specifically, the cap 31 is removed from the trap device 1, the wrench portion 34 of the cap 31 is fitted into the fitting recess 29 at the rear end of the valve stem 20, and the valve stem 20 is rotated in the tightening direction.

[0046] Rotation of the valve stem 20 causes it to move in the direction of arrow 91 according to the screw mechanism of the threaded portion 25. The tip 22 of the valve body 21 then contacts the tapered surface 55a formed on the inner wall of the valve seat space 54, reaching the limit position in the direction of arrow 91 and closing the valve (Figure 3). As a result, the tip 22 of the valve body 21 closes the central valve seat passage 55, and at the same time, the outer circumferential surface of the valve body 21 closes the valve seat passage 53, blocking the passage from the inlet 41 to the trap valve chamber 87.

[0047] In this way, the valve is closed, preventing drain from flowing into the flow path beyond the valve seat space 54, and the trap section 8 can be easily removed from the main body 40 for replacement or maintenance. The trap section 8 is removed by operating a bolt provided on the flange 65 of the connecting joint 60.

[0048] In the closed valve state shown in Figure 3, the small-diameter portion 23 of the valve stem 20 is located on the line connecting the axis of the first bypass passage 51 and the axis of the second bypass passage 52, allowing drain to flow from the first bypass passage 51 to the second bypass passage 52. Therefore, even in the closed valve state, the drain flowing in from the inlet 41 passes sequentially through the main body first passage 44, the first bypass passage 51, the valve seat space 54, and the second bypass passage 52, as indicated by the arrow 105, and is discharged from the main body third passage 46 and the outlet 42. Thus, even while performing work such as replacing or maintaining the trap section 8, the drain can be easily and reliably discharged by allowing it to pass through the first bypass passage 51 and the second bypass passage 52 from the inlet 41 to the outlet 42.

[0049] [Other embodiments] In the embodiments described above, examples were given for each of the automatic valve device, target fluid, main body, inlet, communication channel, outlet, automatic valve mechanism, on / off valve mechanism, open basic state, closed state, auxiliary channel, on / off space, on / off section, auxiliary open section, inner wall inclined surface, and on / off inclined surface. However, these are merely examples, and different configurations can be adopted for each of them.

[0050] In other words, for example, in the embodiment described above, the trap device 1 was given as an example of an automatic valve device, but it is not limited to this, and the automatic valve device according to the present invention can be applied to other devices as long as they are automatic valves that automatically discharge fluids such as inflowing drains.

[0051] Furthermore, in the above-described embodiment, a free-float type trap section 8 that automatically discharges drain according to the floating of the float 89 was exemplified as the automatic valve mechanism, but other types of automatic valves such as bimetallic traps, disc traps, bucket traps, or vapor pressure expansion traps can also be used.

[0052] Furthermore, in the above-described embodiment, a valve section 2 equipped with a valve stem 20 that moves linearly along the direction of the reference line L1 was exemplified as the on / off valve mechanism. However, other configurations may be adopted as long as they open and close the communication between the inlet (inlet 41, etc.) and the communication passage (valve seat central passage 55, main body central passage 43, and connecting central passage 61, etc.). For example, a configuration can be used in which the communication between the inlet and the communication passage is opened and closed by movement other than linear movement.

[0053] Furthermore, in the above-described embodiment, a first bypass channel 51 and a second bypass channel 52 were exemplified as auxiliary channels, but other shapes and arrangements can be adopted as long as they connect the inlet (inlet 41, etc.) and the outlet (outlet 42, etc.).

[0054] Furthermore, although the valve body 21 of the valve stem 20 was exemplified as the opening / closing part in the above-described embodiment, other shapes can be adopted as long as they can reciprocate within the opening / closing space (valve seat space 54, etc.) to open or close the communication between the inlet (inlet 41, etc.) and the communication passage (valve seat central passage 55, main body central passage 43, and connecting central passage 61, etc.). In addition, although the small-diameter portion 23 of the valve stem 20 was exemplified as the auxiliary opening part in the above-described embodiment, other shapes can be adopted as long as they can open the auxiliary passages (first bypass passage 51 and second bypass passage 52, etc.).

[0055] Furthermore, in the above-described embodiment, a tapered surface 55a formed on the inner wall of the valve seat space 54 was exemplified as the inner wall inclined surface, but different shapes and structures can be used as long as they are inclined along the flow direction of the target fluid (drain, etc.) and guide the flow of the target fluid. In addition, in the above-described embodiment, the valve body tip 22 formed at the tip of the valve stem 20 was exemplified as the opening and closing inclined surface, but different shapes and structures can be used as long as they can contact the inner wall inclined surface (tapered surface 55a, etc.).

[0056] Furthermore, in the above-described embodiment, an example was given in which the axis of the main body first flow path 44 and the axis of the valve seat central flow path 55 (reference line L1) are perpendicular. However, it is also possible to adopt a configuration in which the flow direction of the target fluid (drain, etc.) flowing through the inlet section (inlet 41 and main body first flow path 44, etc.) and the flow direction of the target fluid (drain, etc.) flowing through the connecting flow path (valve seat central flow path 55, main body central flow path 43 and connecting central flow path 61, etc.) intersect at an angle other than perpendicular. In addition, new embodiments can be created by arbitrarily combining each of the above-described embodiments. [Explanation of Symbols]

[0057] 1: Trap device 2: Valve section 8: Trap section 21: Valve body 22: Valve body tip 23: Small diameter section 40: Main body of the device 41: Inlet 42: Outlet 43: Central channel of the main body 44: Main body first channel 51: First bypass channel 52: Second bypass channel 54: Valve seat space 55: Valve seat central channel 55a: Tapered surface 61: Connecting central channel

Claims

1. A body through which a target fluid flows, having an inlet into which the target fluid enters, a communication channel communicating with the inlet, and an outlet outlet into which the target fluid exits. An automatic valve mechanism detachably provided to the main body, which operates in response to the target fluid flowing in through the communication channel and automatically discharges the target fluid. An on / off valve mechanism provided in the main body, wherein the on / off valve mechanism is provided so as to be displaceable between an open basic state in which communication between the inlet and the communication passage is opened, and a closed basic state in which communication between the inlet and the communication passage is closed. An automatic valve device equipped with, The main body is provided with an auxiliary channel that connects the inlet and outlet sections. The on / off valve mechanism closes the auxiliary passage when it is in the open basic state, and opens the auxiliary passage when it is in the closed basic state. An automatic valve device characterized by the following features.

2. In the automatic valve device according to claim 1, The main body is provided with an opening and closing space in the communication portion between the inlet and the communication channel. The on / off valve mechanism includes an on / off section that can reciprocate within the on / off space to open or close the communication between the inlet and the communication passage, and an auxiliary opening section that can open the auxiliary passage. An automatic valve device characterized by the following features.

3. In the automatic valve device according to claim 2, The flow direction of the target fluid flowing through the inlet and the flow direction of the target fluid flowing through the communication channel intersect. The inner wall of the opening / closing space is formed with an inclined inner wall surface that is inclined along the flow direction of the target fluid and guides the flow of the target fluid. The opening and closing section has an opening and closing inclined surface that can contact the inclined surface of the inner wall. An automatic valve device characterized by the following features.

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