Valve device

Abstract

To secure a flow rate of a fluid passing through a valve hole.SOLUTION: A valve seat 5 is a valve seat which a valve 4 is seated on or separated from and includes a valve seat body 50 in which a valve hole 51 is formed penetrating therethrough. A passage cross sectional area of the first valve hole 51 continuously expands from an inlet end 55 of the first valve hole 51 to an outlet end 56 of the first valve hole 51. The outlet end 56 is formed with a chamfered portion.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The technology disclosed herein relates to a valve seat and a valve device.

Background Art

[0002] Patent Document 1 discloses a valve seat on which a valve of a steam trap seats and disengages. A valve hole is formed in the valve seat. The valve hole is opened and closed by a valve.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the valve hole at the time of valve opening, a pressure loss occurs in the fluid passing through the valve hole. Therefore, it is difficult to ensure the flow rate of the fluid passing through the valve hole.

[0005] The technology disclosed herein has been made in view of such a point, and the object thereof is to ensure the flow rate of the fluid passing through the valve hole.

Means for Solving the Problems

[0006] The valve seat disclosed herein is a valve seat on which a valve seats and disengages, and includes a valve seat body having a valve hole formed therethrough. The cross-sectional area of the flow path of the valve hole continuously expands from the inlet end of the valve hole toward the outlet end of the valve hole, and a chamfer is formed at the outlet end.

[0007] The valve device disclosed herein comprises an inlet into which liquid and gas flow in; a storage chamber communicating with the inlet and storing the liquid flowing in from the inlet; a first valve hole provided in the storage chamber; a float valve housed in the storage chamber and opening and closing the first valve hole by rising and falling according to the liquid storage level in the storage chamber; a second valve hole provided in the storage chamber above the first valve hole; a temperature-sensitive valve provided in the storage chamber and opening and closing the second valve hole by deforming according to the temperature; and a valve seat, wherein the second valve hole is formed by the valve hole.

[0008] The valve device disclosed herein comprises an inlet into which liquid and gas flow in, a storage chamber communicating with the inlet and storing the liquid flowing in from the inlet, a valve seat provided in the storage chamber, and a float valve housed in the storage chamber that opens and closes the valve hole by rising and falling according to the liquid storage level in the storage chamber, wherein the inlet end is not chamfered. [Effects of the Invention]

[0009] The valve seat can ensure the flow rate of fluid passing through the valve opening.

[0010] The valve seat device can ensure the flow rate of fluid passing through the valve opening. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a cross-sectional view of the drain trap. [Figure 2] Figure 2 is a cross-sectional view of the second valve mechanism. [Figure 3] Figure 3 is a cross-sectional view of the first valve seat. [Figure 4] Figure 4 is an enlarged view of section A1 in Figure 3. [Figure 5] Figure 5 is an enlarged view of section A2 in Figure 3. [Figure 6] Figure 6 is a cross-sectional view of the second valve seat. [Figure 7] Figure 7 is an enlarged view of section A3 in Figure 6. [Figure 8] Figure 8 is an enlarged view of section A4 of Figure 6. [Figure 9] Figure 9 is a cross-sectional view showing the valve seat of a comparative example. [Modes for carrying out the invention]

[0012] The following describes exemplary embodiments with reference to the drawings. Figure 1 is a cross-sectional view of a drain trap 1. The drain trap 1 is installed, for example, in the steam piping of a steam system that utilizes steam. The drain trap 1 allows drain to flow out when drain flows in, while preventing steam from flowing out when steam flows in. The drain trap 1 is an example of a valve device. Drain is an example of a liquid. Steam is an example of a gas. The drain trap 1 comprises a casing 2 in which liquid and gas flow paths are formed, and a first valve mechanism 3 and a second valve mechanism 6 provided in the flow paths to open and close the flow paths. Drain that flows into the casing 2 basically flows out of the casing 2 via the first valve mechanism 3. The second valve mechanism 6 basically discharges air that flows into the casing 2. However, the second valve mechanism 6 may also discharge drain that flows into the casing 2.

[0013] Casing 2 has a liquid and gas inlet 21, a storage chamber 22 communicating with the inlet 21 and storing liquid, and a liquid and gas outlet 23. In this example, condensate, steam, and air can flow into casing 2 from the inlet 21. The storage chamber 22 stores condensate. The outlet 23 discharges the condensate and air to the outside of casing 2. Casing 2 further has a first discharge passage 24 connecting the storage chamber 22 and the outlet 23, and a second discharge passage 25 connecting the storage chamber 22 and the first discharge passage 24.

[0014] In the casing 2, a flow path is formed by the inlet 21, the storage chamber 22, the outlet 23, the first discharge passage 24, and the second discharge passage 25. Specifically, the flow path has a first flow path for discharging drain and a second flow path for discharging air and drain. The first flow path is formed by the inlet 21, the storage chamber 22, the first discharge passage 24, and the outlet 23. The second flow path is formed by the inlet 21, the storage chamber 22, the second discharge passage 25, the first discharge passage 24, and the outlet 23.

[0015] The inlet 21 and the outlet 23 are located on the same axis. The upper part of the storage chamber 22 communicates with the inlet 21. The upstream end of the first discharge passage 24 communicates with the lower part of the storage chamber 22. The downstream end of the first discharge passage 24 communicates with the outlet 23. The upstream end of the second discharge passage 25 communicates with the upper part of the storage chamber 22. The downstream end of the second discharge passage 25 communicates with the first discharge passage 24.

[0016] The first valve mechanism 3 opens and closes the first discharge passage 24, and thus the first flow path. The first valve mechanism 3 is a float-type valve mechanism that discharges liquid while preventing the discharge of gas. In this example, the first valve mechanism 3 discharges drain while preventing the discharge of vapor. The first valve mechanism 3 has a first valve 4 and a first valve seat 5. The first valve 4 is an example of a valve. The first valve seat 5 is an example of a valve seat.

[0017] The first valve 4 is a float valve. The first valve 4 is formed in a hollow spherical shape. The first valve 4 is freely accommodated in the storage chamber 22.

[0018] The first valve seat 5 is provided in the storage chamber 22. Specifically, the first valve seat 5 is provided at the connection portion between the storage chamber 22 and the first discharge passage 24. A first valve hole 51 for communicating the storage chamber 22 and the first discharge passage 24 is formed in the first valve seat 5. The first valve hole 51 is an example of a valve hole.

[0019] When the drain in the storage chamber 22 increases, the first valve 4 rises and separates from the first valve seat 5, opening the first valve hole 51. On the other hand, when the drain in the storage chamber 22 decreases, the first valve 4 descends and seats on the first valve seat 5, closing the first valve hole 51. That is, the first valve 4 opens and closes the first valve hole 51 by rising and falling according to the storage level (i.e., water level) of the drain in the storage chamber 22.

[0020] The second valve mechanism 6 opens and closes the second discharge passage 25, and thus the second flow path. The second valve mechanism 6 is a thermally actuated valve mechanism that discharges fluid below a predetermined temperature while preventing the discharge of fluid above the predetermined temperature. In this example, the second valve mechanism 6 discharges air and drain while preventing the discharge of steam. The second valve mechanism 6 has a second valve 7 and a second valve seat 8. The second valve 7 is an example of a valve. The second valve seat 8 is an example of a valve seat.

[0021] Figure 2 is a cross-sectional view of the second valve mechanism 6. The second valve 7 is a thermally actuated valve that deforms according to temperature. The second valve 7 is provided above the storage chamber 22. The second valve 7 is housed in a holding member 26 provided in the casing 2. The second valve 7 has a valve body 71 and a temperature-responsive portion 73.

[0022] The temperature-responsive portion 73 is formed in a substantially disk shape with an expansion medium enclosed therein. At least a part of the temperature-responsive portion 73 is formed by a diaphragm 74. The diaphragm 74 is formed of a plurality of or a single metal thin film. The valve body 71 is attached to the diaphragm 74. The expansion medium is a medium that expands and contracts according to temperature. The expansion medium is, for example, water, a liquid with a boiling point lower than water, or a mixture thereof. When the expansion medium expands and contracts, the diaphragm 74 deforms. Accordingly, the valve body 71 is displaced.

[0023] The second valve seat 8 is located in the storage chamber 22. Specifically, the second valve seat 8 is located at the connection point between the storage chamber 22 and the second discharge passage 25. The second valve seat 8 has a second valve hole 81 that connects the storage chamber 22 and the second discharge passage 25. The second valve hole 81 is an example of a valve hole. The second valve hole 81 is located above the first valve hole 51.

[0024] When the temperature of the temperature-sensitive section 73 rises, the expansion medium expands, the diaphragm 74 deforms, and the valve body 71 displaces and seats on the second valve seat 8. As a result, the second valve hole 81 is closed by the valve body 71. When the temperature of the temperature-sensitive section 73 falls, the expansion medium contracts, the diaphragm 74 deforms, and the valve body 71 displaces and moves away from the second valve seat 8. As a result, the second valve hole 81 is opened. In this example, an expansion medium is used such that the valve body 71 moves away from the second valve seat 8 at a temperature similar to that of drain, and the valve body 71 seats on the second valve seat 8 at a temperature similar to that of steam.

[0025] Next, the operation of the drain trap 1 will be described. Before the steam system is started, there is no drain in the casing 2, or there is only a small amount of drain in the casing 2, and the first valve body 31 is seated on the first valve seat 5. Also, the temperature of the temperature-sensitive part 73 is low, and the valve body 71 is separated from the second valve seat 8. In other words, the first valve mechanism 3 is closed, and the second valve mechanism 6 is open.

[0026] When the steam system is started from this state, condensate begins to flow from the inlet 21 into the storage chamber 22. At this time, the air that was present in the piping connected to the inlet 21 also flows into the storage chamber 22 along with the condensate. The condensate that flows into the storage chamber 22 accumulates at the bottom of the storage chamber 22. When the condensate level in the storage chamber 22 rises, the first valve body 31 rises and separates from the first valve seat 5. As a result, the first valve mechanism 3 opens, and the condensate from the storage chamber 22 flows out from the outlet 23 via the first valve hole 51 and the first discharge passage 24.

[0027] The air that flows into the storage chamber 22 remains in the upper part of the storage chamber 22. At this time, unless the air temperature is very high, the volume of the expansion medium in the temperature-sensitive part 73 is small. Therefore, the deformation of the diaphragm 74 is small, and the valve body 71 remains separated from the second valve seat 8. In other words, the second valve mechanism 6 remains open. As a result, the air flows into the second discharge passage 25 through the second valve hole 81 and flows out from the outlet 23 through the first discharge passage 24.

[0028] Furthermore, if the amount of drain flowing in from the inlet 21 is greater than the amount of drain discharged from the first valve mechanism 3, the drain storage level in the storage chamber 22 rises, and the drain accumulates up to the top of the storage chamber 22. In this case, the temperature of the temperature-sensitive section 73 approaches the temperature of the drain. In this example, when the temperature of the expansion medium in the temperature-sensitive section 73 is about the same as that of the drain, the volume of the expansion medium is small, and the deformation of the diaphragm 74 is small. Therefore, the valve body 71 remains separated from the second valve seat 8. Consequently, the drain flows into the second discharge passage 25 through the second valve hole 81 and flows out from the outlet 23 through the first discharge passage 24.

[0029] On the other hand, when steam flows into the storage chamber 22 from the inlet 21, the condensate in the storage chamber 22 is discharged from the first valve hole 51 and decreases, until the first valve body 31 seats on the first valve seat 5. In this way, the first valve mechanism 3 closes, and the discharge of steam from the first valve hole 51 is prevented.

[0030] Furthermore, when steam flows into the storage chamber 22, the temperature of the temperature-sensitive section 73 rises, causing the expansion medium to expand. The expansion of the expansion medium deforms the diaphragm 74, and consequently, the valve body 71 is displaced upward and seats on the second valve seat 8. In this way, the second valve mechanism 6 closes, preventing the discharge of steam from the second valve hole 81.

[0031] Next, the first valve seat 5 and the second valve seat 8 will be described in detail. Figure 3 is a cross-sectional view of the first valve seat 5. The first valve seat 5 comprises a valve seat body 50 through which a first valve hole 51 is formed. The valve seat body 50 is formed in a substantially cylindrical shape. One axial end of the valve seat body 50 is located in the storage chamber 22. The end of the valve seat body 50 opposite to the storage chamber 22 is located in the first discharge passage 24. A flange portion 53 is formed in the axial middle portion of the valve seat body 50, projecting radially outward from the valve seat body 50. A male screw 54 is formed on the outer circumferential surface of the portion of the valve seat body 50 closer to the storage chamber 22 than the flange portion 53. The male screw 54 is screwed into the casing 2.

[0032] The first valve hole 51 penetrates the valve seat body 50 along a predetermined axis X1. In this example, the axis X1 extends along the axis of the valve seat body 50. That is, the first valve hole 51 penetrates the valve seat body 50 in the axial direction. An annular seat surface 52 surrounding the first valve hole 51 is formed on the end face of the valve seat body 50 on the storage chamber 22 side. The first valve hole 51 is opened and closed by the seating and unseating of the first valve 4 on the seat surface 52.

[0033] The first valve hole 51 is a hole with a circular cross-section. The first valve hole 51 has an inlet end 55 through which fluid flows in and an outlet end 56 through which fluid flows out. The inlet end 55 is the upstream opening surface of the first valve hole 51. The outlet end 56 is the downstream opening surface of the first valve hole 51. The flow path cross-sectional area of ​​the first valve hole 51 expands continuously from the inlet end 55 to the outlet end 56. In this disclosure, "continuously expands" means that it expands gradually, not in steps. Specifically, the flow path cross-sectional area of ​​the first valve hole 51 expands continuously along the entire length of the first valve hole 51 in the direction of axis X1 (i.e., the direction in which axis X1 extends). The rate of change in the expansion of the flow path cross-sectional area of ​​the first valve hole 51 is constant along the entire length of the first valve hole 51 in the direction of axis X1. That is, the first valve hole 51 is tapered.

[0034] Figure 4 is an enlarged cross-sectional view of portion A1 in Figure 3. The inlet end 55 forms the corner between the first valve hole 51 and the seat surface 52. In other words, no chamfer is formed on the inlet end 55.

[0035] Figure 5 is an enlarged cross-sectional view of portion A2 in Figure 3. The outlet end 56 has a chamfer. That is, in the first valve hole 51, of the inlet end 55 and the outlet end 56, only the outlet end 56 has a chamfer. The chamfer at the outlet end 56 is an R-chamfer. More precisely, the flow path cross-sectional area at the outlet end 56 expands toward the downstream side.

[0036] Figure 6 is a cross-sectional view of the second valve seat 8. The second valve seat 8 comprises a valve seat body 80 through which a second valve bore 81 is formed. In this example, the valve seat body 80 is formed in a substantially cylindrical shape. One axial end of the valve seat body 80 is located in the storage chamber 22. The end of the valve seat body 80 opposite to the storage chamber 22 is located in the second discharge passage 25. A flange portion 83 is formed on the end of the valve seat body 80 that is on the storage chamber 22 side, projecting radially outward. A male screw 84 is formed on the outer circumferential surface of the portion of the valve seat body 80 opposite to the storage chamber 22 from the flange portion 83. The male screw 84 is screwed into the casing 2.

[0037] The second valve hole 81 penetrates the valve seat body 50 along a predetermined axis X2. In this example, the axis X2 is along the axis of the valve seat body 50. That is, the second valve hole 81 penetrates the valve seat body 80 in the axial direction. An annular seat surface 82 surrounding the second valve hole 81 is formed on the end face of the valve seat body 80 on the storage chamber 22 side. The second valve hole 81 is opened and closed by the valve body 71 seating on and off the seat surface 82.

[0038] The second valve hole 81 is a hole with a circular cross-section. The second valve hole 81 has an inlet end 85 through which fluid flows in and an outlet end 86 through which fluid flows out. The inlet end 85 is the upstream opening surface of the second valve hole 81. The outlet end 86 is the downstream opening surface of the second valve hole 81. The flow path cross-sectional area of ​​the second valve hole 81 expands continuously from the inlet end 85 to the outlet end 86. Specifically, the flow path cross-sectional area of ​​the second valve hole 81 expands continuously along the entire length of the second valve hole 81 in the direction of axis X2 (i.e., the direction in which axis X2 extends). The rate of change in the expansion of the flow path cross-sectional area of ​​the second valve hole 81 is constant along the entire length of the second valve hole 81 in the direction of axis X2. In other words, the second valve hole 81 is formed in a tapered shape.

[0039] Figure 7 is an enlarged view of section A3 in Figure 6. The inlet end 85 has a chamfer. More specifically, the chamfer at the inlet end 85 is an R-chamfer. More precisely, the cross-sectional area of ​​the flow path at the inlet end 85 expands towards the upstream side.

[0040] Figure 8 is an enlarged view of section A4 in Figure 6. The outlet end 86 has a chamfer. That is, in the second valve hole 81, chamfers are formed on both the inlet end 85 and the outlet end 86. The chamfer on the outlet end 86 is an R-chamfer. More precisely, the flow path cross-sectional area of ​​the outlet end 86 expands toward the downstream side.

[0041] As mentioned above, in the first valve seat 5, as shown in Figure 3, the flow path cross-sectional area of ​​the first valve hole 51 expands continuously from the inlet end 55 to the outlet end 56. Therefore, vortices are less likely to form in the fluid in the first valve hole 51. If, for example, a rapidly expanding section 92 of the flow path cross-sectional area exists in the valve hole 91, as in the comparative example valve seat 9 shown in Figure 9, vortices will be generated in the rapidly expanding section 92, increasing the fluid pressure loss. However, since such a rapidly expanding section 92 is not formed in the first valve hole 51, vortices are less likely to form in the fluid. Therefore, the fluid pressure loss in the first valve hole 51 can be reduced.

[0042] In addition, a chamfer is formed on the outlet end 56 of the valve hole 51. This makes the fluid flow at the outlet end 56 smoother. As a result, the fluid pressure loss at the outlet end 56 is reduced. In particular, in this example, the chamfer on the outlet end 56 is an R-chamfer. Therefore, compared to the case where the chamfer on the outlet end 56 is a C-chamfer, the fluid flow at the outlet end 56 becomes even smoother, and the fluid pressure loss at the outlet end 56 is even smaller.

[0043] Furthermore, by forming a chamfer at the outlet end 56, the flow path cross-sectional area immediately before the outlet end 56 in the first valve hole 51 can be reduced. As a result, the rate of change in the expansion of the flow path cross-sectional area of ​​the first valve hole 51, i.e., the angle of expansion of the first valve hole 51, can be reduced. Consequently, the generation of fluid vortices in the first valve hole 51 can be further reduced, and the fluid pressure loss in the first valve hole 51 can be further reduced. In other words, in the first valve hole 51, the flow path cross-sectional area of ​​the first valve hole 51 expands continuously, and the flow path cross-sectional area of ​​the first valve hole 51 is reduced by forming a chamfer at the outlet end 56. Therefore, the flow rate of the fluid passing through the first valve hole 51, i.e., the flow rate of the drain, can be sufficiently secured.

[0044] Furthermore, in this example, the rate of change in the expansion of the flow path cross-sectional area of ​​the first valve hole 51 is constant along the entire length of the first valve hole 51 in the direction of axis X1. Therefore, compared to the case where the rate of change in the expansion of the flow path cross-sectional area of ​​the first valve hole 51 gradually increases toward the outlet end 56, fluid vortices are even less likely to occur. Consequently, the fluid pressure loss in the first valve hole 51 can be further reduced.

[0045] Furthermore, no chamfer is formed on the inlet end 55 of the first valve hole 51. This reduces the flow path cross-sectional area at the inlet end 55, thereby reducing the force acting on the first valve 4 when it is closed, which is in the direction of closing the first valve hole 51. In other words, when the first valve 4 is closed, a force acts on the first valve 4 in the direction of closing the first valve hole 51 due to the difference between the fluid pressure in the storage chamber 22 and the fluid pressure in the first valve hole 51, but this force can be reduced. Therefore, even if the buoyancy generated on the first valve 4, which is a float valve, is small, the first valve 4 can be raised appropriately and the first valve hole 51 can be opened appropriately. Consequently, for example, the first valve hole 51 can be opened in the early stages when drain begins to accumulate in the storage chamber 22, and the drain can be quickly discharged from the first valve hole 51.

[0046] On the other hand, in the second valve seat 8, as shown in Figure 6, the flow path cross-sectional area of ​​the second valve hole 81 expands continuously from the inlet end 85 to the outlet end 86, and no sharply expanding portion 92 of the flow path cross-sectional area is formed in the second valve hole 81. Therefore, the fluid pressure loss in the second valve hole 81 can be reduced.

[0047] In addition, since a chamfer is formed on the outlet end 86 of the second valve hole 81, the fluid flow at the outlet end 86 becomes smoother. Therefore, the fluid pressure loss at the outlet end 86 is reduced. In particular, in this example, the chamfer on the outlet end 86 is an R-chamfer. Therefore, compared to the case where the chamfer on the outlet end 86 is a C-chamfer, the fluid flow at the outlet end 86 becomes even smoother, and the fluid pressure loss at the outlet end 86 becomes even smaller.

[0048] Furthermore, by forming a chamfer at the outlet end 86, the flow path cross-sectional area immediately before the outlet end 86 in the second valve hole 81 can be reduced. Therefore, the rate of change in the expansion of the flow path cross-sectional area of ​​the second valve hole 81 can be reduced. Consequently, the fluid pressure loss in the second valve hole 81 can be further reduced. Therefore, the flow rate of the fluid passing through the second valve hole 81, i.e., the flow rate of air and drain, can be sufficiently ensured.

[0049] Furthermore, the second valve seat 8 also has a chamfer formed on the inlet end 85. This makes the fluid flow at the inlet end 85 smoother and reduces the fluid pressure loss at the inlet end 85. In particular, the chamfer at the inlet end 85 is an R-chamfer. Therefore, compared to the case where the chamfer at the inlet end 85 is a C-chamfer, the fluid flow at the inlet end 85 can be made even smoother. Consequently, the fluid pressure loss at the inlet end 85 can be reduced, and the fluid pressure loss at the second valve hole 81 can be further reduced.

[0050] As described above, the first valve seat 5 is a valve seat on which the first valve 4 sits and dissipates, and comprises a valve seat body 50 through which the first valve hole 51 is formed. The flow path cross-sectional area of ​​the first valve hole 51 expands continuously from the inlet end 55 of the first valve hole 51 toward the outlet end 56 of the first valve hole 51, and the outlet end 56 has a chamfer formed thereon.

[0051] With this configuration, the flow path cross-sectional area of ​​the first valve hole 51 expands continuously from the inlet end 55 to the outlet end 56, thereby reducing the fluid pressure loss in the first valve hole 51. In addition, a chamfer is formed at the outlet end 56, which makes the fluid flow at the outlet end 56 smoother and also reduces the fluid pressure loss at the outlet end 56. Therefore, the fluid flow rate passing through the first valve hole 51 can be ensured.

[0052] Furthermore, the second valve seat 8 (valve seat) is a valve seat on which the second valve 7 (valve) sits and dissipates, and comprises a valve seat body 80 through which the second valve hole 81 (valve hole) is formed. The flow path cross-sectional area of ​​the second valve hole 81 expands continuously from the inlet end 85 of the second valve hole 81 toward the outlet end 86 of the second valve hole 81, and the outlet end 86 has a chamfer formed thereon.

[0053] With this configuration, the flow path cross-sectional area of ​​the second valve hole 81 expands continuously from the inlet end 85 to the outlet end 86, thereby reducing the fluid pressure loss in the second valve hole 81. In addition, a chamfer is formed at the outlet end 86, which makes the fluid flow at the outlet end 86 smoother and reduces the fluid pressure loss at the outlet end 86. Therefore, a sufficient fluid flow rate can be ensured when passing through the second valve hole 81.

[0054] Furthermore, the entrance end 85 has a chamfered edge.

[0055] This configuration allows for smoother fluid flow at the inlet end 85, reducing fluid pressure loss at the inlet end 85. Consequently, fluid pressure loss at the second valve hole 81 can be further reduced.

[0056] Furthermore, the chamfers on the exit end 56, the inlet end 85, and the exit end 86 are all rounded (R-chamfers).

[0057] With this configuration, the fluid flow at each of the outlet end 56, inlet end 85, and outlet end 86 becomes smoother, and the fluid pressure loss at the first valve hole 51 and the second valve hole 81 can be further reduced.

[0058] Furthermore, the drain trap 1 (valve device) comprises an inlet 21 into which liquid and gas flow in, a storage chamber 22 communicating with the inlet 21 and storing the liquid that flows in from the inlet 21, a first valve hole 51 provided in the storage chamber 22, a first valve 4 (float valve) housed in the storage chamber 22 and opening and closing the first valve hole 51 by rising and falling according to the liquid storage level in the storage chamber 22, a second valve hole 81 provided in the storage chamber 22 above the first valve hole 51, a second valve 7 (temperature-responsive valve) provided in the storage chamber 22 and opening and closing the second valve hole 81 by deforming according to the temperature, and a second valve seat 8 (valve seat), the second valve hole 81 being formed by the valve hole of the second valve seat 8.

[0059] With this configuration, the flow rate of liquid and gas passing through the second valve hole 81 can be ensured in the drain trap 1.

[0060] Furthermore, the drain trap 1 (valve device) comprises an inlet 21 into which liquid and gas flow in, a storage chamber 22 communicating with the inlet 21 and storing the liquid that flows in from the inlet 21, a first valve seat 5 (valve seat) provided in the storage chamber 22, and a first valve 4 (float valve) housed in the storage chamber 22 that opens and closes the first valve hole 51 by rising and falling according to the liquid storage level in the storage chamber 22, and the inlet end 55 does not have a chamfer formed on it.

[0061] With this configuration, since no chamfer is formed on the inlet end 55, the area of ​​the portion of the first valve 4 that blocks the first valve hole 51 when the valve is closed can be reduced. Therefore, the force acting on the first valve 4 in the direction of closing the first valve hole 51 when the valve is closed can be reduced. As a result, even when the buoyancy generated in the first valve 4, which is a float valve, is small, the first valve 4 can be raised appropriately and the first valve hole 51 can be opened appropriately. Consequently, the first valve hole 51 can be opened in the initial stages when fluid begins to accumulate in the storage chamber 22, and the fluid can be quickly discharged from the first valve hole 51.

[0062] Other embodiments As described above, the embodiments described herein have been presented as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted as appropriate. Furthermore, it is possible to combine the components described in the embodiments above to create new embodiments. In addition, the components described in the attached drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem, in order to illustrate the technology. Therefore, the mere presence of such non-essential components in the attached drawings and detailed description should not be immediately assumed to mean that those non-essential components are essential.

[0063] For example, the drain trap 1 is not limited to a steam trap that prevents the discharge of steam. The drain trap 1 may be an air trap that prevents the discharge of air or a gas trap that prevents the discharge of gas. The technology of this disclosure is not limited to the drain trap 1, but can be applied to any valve device that controls the flow of gas or liquid as a fluid. The valve device may consist of only the first valve mechanism 3 or only the second valve mechanism 6 of the first valve mechanism 3 and the second valve mechanism 6. Furthermore, the second valve mechanism 6 is not limited to a thermally responsive type. The second valve mechanism 6 may be, for example, a so-called disc-type valve mechanism in which the valve body 71 is formed in a disc shape.

[0064] If the portion of the first valve hole 51 extending from the inlet end 55 to the outlet end 56 is continuously enlarged, the first valve hole 51 may have a portion where the flow path cross-sectional area does not continuously enlarge toward the outlet end 56. In other words, the flow path cross-sectional area of ​​the first valve hole 51 only needs to be continuously enlarged in at least the portion of the first valve hole 51 extending from the inlet end 55 to the outlet end 56. A chamfer may be formed on the inlet end 55. A C-chamfer may be formed on the outlet end 56 instead of an R-chamfer.

[0065] If the portion of the second valve hole 81 extending from the inlet end 85 to the outlet end 86 is continuously enlarged, there may be a portion where the flow path cross-sectional area does not continuously enlarge toward the outlet end 86. In other words, the flow path cross-sectional area of ​​the second valve hole 81 only needs to be continuously enlarged in at least the portion of the second valve hole 81 extending from the inlet end 85 to the outlet end 86. A chamfer may be formed on the inlet end 85 instead of an R chamfer. A chamfer may not be formed on the inlet end 85. A chamfer may be formed on the outlet end 86 instead of an R chamfer. [Explanation of Symbols]

[0066] 1. Drain trap (valve device) 21 Inlet 22 Storage chamber 4. First valve (valve, float valve) 5. First valve seat (valve seat) 50 Valve seat body 51. First valve opening (valve opening) 55 Inlet end 56 Outlet end 7. Second valve (temperature-responsive valve) 8. Second valve seat (valve seat) 80 Valve seat body 81. Second valve opening (valve opening) 85 Inlet end 86 Outlet end

Claims

[Claim 1] An inlet into which liquid and gas flow in, A storage chamber that communicates with the inlet and stores the liquid that flows in from the inlet, The valve seat on which the valve sits and separates, The device comprises a float valve housed in the storage chamber, which opens and closes a valve hole by rising and falling according to the liquid level in the storage chamber, The valve seat has a valve seat body through which the valve hole is formed, The cross-sectional area of ​​the flow path of the valve hole expands continuously from the inlet end to the outlet end of the valve hole. The aforementioned entrance end does not have a chamfer formed on it. The aforementioned outlet end is a valve device with a chamfered edge.

Images