Valve and valve seat for use in valve

Abstract

To provide a valve capable of automatically removing foreign matter adhering to a valve port periphery of a valve seat, and a valve seat part used in the valve.SOLUTION: A circular first groove 31, second groove 32, and third groove 33 are formed on a valve seat tip surface 50a of a valve seat 50 provided in a valve chamber of a steam trap, and at a boundary portion of the respective grooves, a first crushing blade 11 and a second crushing blade 12 having a tip formed as a blade having a pointed shape toward the surface of the valve seat tip surface 50a are provided. Then, a float 70 is affected by drain flowing into a valve chamber 95, and frequently swings in a state of being seated on the valve seat 50, and foreign matter adhering to the valve seat tip surface 50a is repeatedly pressed against the first crushing blade 11 and the second crushing blade 12 by a float spherical surface 70a. Consequently, the foreign matter is crushed and removed by the first crushing blade 11 and the second crushing blade 12.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The valve and the valve seat portion used in the valve according to the present application relate to technology regarding the structure of a valve seat in which an orifice and the like are formed. [Background technology]

[0002] An example of a valve is a steam trap installed in an industrial plant. An industrial plant may have a piping system that transports steam generated in a boiler to its destination at high temperature and pressure. If the steam liquefies in this piping and drainage (steam condensation) occurs, it will impede the transport of the steam, so it is necessary to drain the drainage out of the piping as necessary.

[0003] For this reason, steam traps are installed throughout piping systems. For example, a float-type steam trap has a hollow spherical float built into the valve chamber so that it can float freely. A valve seat with a small orifice (valve port) is provided below the valve chamber, and this orifice is normally blocked by the float's spherical surface seating on it.

[0004] When condensate flows into the valve chamber of a steam trap and accumulates there, the float rises (unseats) and opens the orifice in the valve seat. This release allows the accumulated condensate to be automatically discharged outside the steam trap via the outlet passage that is connected to the orifice. After the condensate is discharged, the float descends and seats, blocking the orifice, so no steam leakage occurs.

[0005] One technology relating to an orifice formed in the valve seat of a steam trap is the valve seat disclosed in Patent Document 1, which will be described later. This valve seat is provided with a notched groove 20 in the flat end portion around a valve orifice 8 formed in a valve seat 7, and is configured by thinning the wall thickness around the valve orifice 8. This prevents malfunction of the float 6 attempting to open the valve orifice 8 due to capillary action, surface tension, etc. of the drain. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 48-40128 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the valve seat disclosed in the above-mentioned Patent Document 1, malfunctions may occur in the opening and closing operation of the valve port depending on the conditions of use. That is, foreign matter such as dirt and scale may be mixed with steam or drain and flow into a valve such as a steam trap, and such foreign matter may adhere to the periphery of the valve port, causing malfunctions.

[0008] Even in such a case, when the float completely opens the valve opening, the momentum of the condensate outflow may expel foreign matter at the same time, but if only a small amount of condensate is retained in the valve chamber, the float does not rise completely, causing the attached foreign matter to accumulate and become stuck. If foreign matter becomes stuck around the valve opening, a gap will form between the valve opening and the float, which can cause condensate or steam to leak.

[0009] As part of the maintenance of valves such as steam traps, the valves are sometimes disassembled and cleaned to remove foreign matter around the valve opening. However, cleaning is time-consuming and cannot be done frequently.

[0010] Therefore, an object of the present application is to provide a valve and a valve seat portion for use in a valve that can automatically remove foreign matter adhering to the periphery of the valve opening of the valve seat. [Means for solving the problem]

[0011] The valve according to the present application is Valve body, A flow passage provided in the valve body; a valve seat disposed in a valve body, the valve seat having a valve port communicating with the flow passage; a valve element disposed in a valve body for closing or opening the valve port; In a valve comprising: The valve seat end surface surrounding the valve port and facing the valve body includes a pointed portion having a pointed tip.

[0012] In addition, the valve seat portion used in the valve according to the present application is A valve seat portion is disposed in a valve body and has a valve port communicating with a flow path provided in the valve body, The valve seat end face surrounding the valve port and facing the valve element that is disposed within the valve body and closes or opens the valve port, includes a pointed portion having a pointed tip. Effect of the Invention

[0013] In the valve and the valve seat used in the valve according to the present application, the valve seat end face surrounding the valve orifice and facing the valve body includes a pointed portion having a sharp tip. Therefore, if a foreign object adheres to the periphery of the valve orifice, the foreign object is crushed and removed between the valve body and the pointed portion as the valve body sits on the seat. Therefore, the foreign object adhered to the periphery of the valve orifice can be automatically removed. [Brief description of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a steam trap 90 and a valve seat 50 illustrating a first embodiment of a valve and a valve seat portion used in the valve according to the present application. [Diagram 2] 2 is a partially enlarged cross-sectional view of a valve seat tip surface 50a of the valve seat 50 shown in FIG. 1, and is a cross-sectional view taken along the line II-II in FIG. [Diagram 3] 2 is a front view of a valve seat tip surface 50a of the valve seat 50 shown in FIG. 1, as viewed from the float 70 side. [Figure 4]FIG. 11 is a diagram showing a second embodiment of a valve and a valve seat portion used in the valve according to the present application, and is a front view of a valve seat tip surface 250a of a valve seat 250 as viewed from the float 70 side. [Diagram 5] FIG. 11 is a diagram showing a third embodiment of a valve and a valve seat portion used in the valve according to the present application, and is a front view of a valve seat tip surface 350a of a valve seat 350 as viewed from the float 70 side. [Figure 6] FIG. 11 is a diagram showing a fourth embodiment of a valve and a valve seat portion used in the valve according to the present application, and is a front view of a valve seat tip surface 450a of a valve seat 450 as viewed from the float 70 side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [Terminology used in the embodiments] The main terms used in the embodiments correspond to the following elements of the valve and the valve seat used in the valve according to the present application.

[0016] First crushing blade 11, 211, 311, 411, 511, 611, 711, second crushing blade 12, 212, 312, 412, 512, 612, 712... sharp part Valve seat 50, 250, 350, 450...Valve seat part Valve seat end face 50a, 250a, 350a, 450a... Valve seat end face Orifice 51, 251, 351, 451...Valve port Intermediate chamber 53, valve chamber 95, inlet 97, outlet 98, outlet 99...flow path Float 70...Valve body Upper body 91 and lower body 92: Valve body

[0017] [First embodiment] A first embodiment of a valve according to the present application and a valve seat portion used in the valve will be described. In this embodiment, an example in which the valve according to the present application and the valve seat portion used in the valve are applied to a steam trap will be given.

[0018] (Explanation of the structure and operation of a steam trap) Industrial plants are often equipped with piping systems that transport steam generated in boilers to its destination at high temperature and pressure. If the steam liquefies in this piping, drainage will accumulate and cause an obstruction to the transport of the steam.

[0019] To avoid such a situation, many steam traps are provided throughout the piping system. Figure 1 is a cross-sectional view of a steam trap 90 in this embodiment. An upper body 91 and a lower body 92 are fixed with bolts 94, forming an airtight valve chamber 95 inside.

[0020] A branch pipe 81 is provided in communication with a main pipe (not shown) of the piping, and an inlet 97 formed in the upper body 91 is connected to this branch pipe 81. Steam and drainage flow into the valve chamber 95 from the inlet 97 in the direction of arrow 101. A mesh strainer 80 is provided above the valve chamber 95, and the steam and drainage pass through this strainer 80 before flowing into the valve chamber 95. By passing through the strainer 80, foreign matter such as dirt and scale mixed in the steam and drainage are captured by the strainer 80.

[0021] A valve seat 50 is fixed below the valve chamber 95, and an orifice 51 is formed in this valve seat 50. This orifice 51 communicates with an intermediate chamber 53 formed in a cylindrical shape behind the valve seat 50, and the intermediate chamber 53 further communicates with an outflow passage 98 formed continuously in the upper body 91 and the lower body 92.

[0022] The outflow passage 98 is connected to a drain recovery pipe 82 connected to an outflow port 99 of the upper main body 91. This allows the drain 9 accumulated in the valve chamber 95 to be discharged in the direction of arrow 102 from the orifice 51 toward the drain recovery pipe 82. The valve chamber 95 side, based on the orifice 51, is the primary side, and the intermediate chamber 53 side is the secondary side.

[0023] A float 70 formed as a hollow spherical body is arranged so as to be able to float within the valve chamber 95. When the water level of the drain 9 retained within the valve chamber 95 is at a reference level L1, the float 70 is positioned as shown in FIG.

[0024] When drain flows into the valve chamber 95 and the water level of the drain 9 rises, the float 70 rises in the direction of arrow 103 and begins to leave the orifice 51, and when the water level of the drain 9 reaches the opening level L2, the orifice 51 is completely opened (not shown). As a result, the drain 9 that has accumulated in the valve chamber 95 flows out of the orifice 51 through the intermediate chamber 53 and the outflow passage 98 in the direction of arrow 102 due to the momentum based on the high pressure in the piping, and is discharged into the drain recovery pipe 82.

[0025] After the condensate is discharged, the water level of the drain 9 in the valve chamber 95 drops, causing the float 70 to drop accordingly, and when the water level of the drain 9 returns to the reference level L1, the float 70 returns to the position shown in Fig. 1 and seats on the valve seat 50, closing the orifice 51. In this way, the orifice 51 repeatedly opens and closes as the float 70 rises and falls, but because the orifice 51 is always submerged in the drain 9, no condensate or steam leaks from the orifice 51.

[0026] A bimetal 85 bent in a curved shape is provided at the bottom inside the valve chamber 95. The bimetal 85 is a temperature-sensitive member made by bonding together two thin alloy plates with different expansion coefficients, and when the ambient temperature is high, the end 85a drops and stays in the state shown in Fig. 1, but when the ambient temperature drops, the shape changes in response, and the end 85a rises, pushing up the float 70 and forcibly opening the orifice 51 regardless of the water level in the drain 9.

[0027] This bimetal 85 is provided to properly discharge low-temperature air and drain from the orifice 51. For example, in the initial stage after the equipment starts operating, the valve chamber 95 is filled with low-temperature air, so the bimetal 85 in its low-temperature state pushes up the float 70, forcing the orifice 51 into an open state. Therefore, when steam transfer starts, this initial air is properly discharged from the orifice 51, and air binding (air obstruction) is avoided. Similarly, the low-temperature drain 9 flowing into the valve chamber 95 is properly discharged from the orifice 51.

[0028] Then, when high-temperature steam subsequently flows into the valve chamber 95, the bimetal 85 reacts to the high temperature and deforms, causing the end 85a to drop and reach the state shown in Figure 1. As a result, thereafter, the float 70 repeats rising and falling according to the water level of the accumulated drain 9 as described above without interference from the bimetal 85, and appropriately discharges the drain in the valve chamber 95 through the orifice 51.

[0029] Incidentally, foreign matter such as dirt and scale mixed in the steam or drain is captured by the strainer 80 as described above, but small foreign matter may pass through the strainer 80 and flow into the valve chest 95. Such foreign matter may adhere to the orifice 51, causing clogging of the orifice 51. In particular, since the orifice 51 is formed with a small diameter so that it can be reliably closed by the spherical surface of the float 70, clogging is likely to occur.

[0030] In order to automatically clean such clogging of orifice 51, a cleaning bar 2 may be provided in intermediate chamber 53. Bar tip 25 of cleaning bar 2 is formed thin and is disposed facing orifice 51. The diameter of bar tip 25 is slightly smaller than the inner diameter of orifice 51. Note that cleaning bar 2 is positioned so as to be able to move back and forth along the directions of arrows 105 and 106, which are the central axial directions of orifice 51.

[0031] A bimetal 30 is fixed to the cleaning bar 2. When the ambient temperature falls below a predetermined low temperature standard, the winding diameter of the bimetal 30 decreases, causing the spiral to stretch and expand in the direction of arrow 106. Conversely, when the temperature of the member rises above the low temperature standard from this state, the winding diameter increases, causing the spiral to shrink and compress in the direction of arrow 105. In other words, the cleaning bar 2 moves in the direction of arrow 106 or arrow 105 as the bimetal 30 expands and contracts.

[0032] Under normal circumstances, high-temperature drainage flows into the intermediate chamber 53 in response to the opening and closing of the orifice 51, so the bimetal 30 is exposed to high temperatures and compressed. For this reason, the cleaning bar 2 is in a retracted state in the direction of arrow 105 as shown in FIG. 1. In contrast, when foreign matter adheres to the orifice 51 and causes a clogging state, the bimetal 30 is no longer exposed to high temperatures and expands. As a result, the cleaning bar 2 advances in the direction of arrow 106, and the bar tip 25 penetrates the orifice 51, peeling off and removing the adhered foreign matter from the orifice 51.

[0033] After the foreign matter is removed by the cleaning bar 2, the drain 9 in the valve chamber 95 flows into the intermediate chamber 53 through the orifice 51, so that the bimetal 30 is exposed to high temperature and compressed again. As a result, the cleaning bar 2 retreats in the direction of the arrow 105 and returns to the state shown in FIG.

[0034] (Explanation of the configuration and operation for removing foreign matter adhering to the valve seat tip surface) If foreign matter adheres to the orifice 51 and causes clogging, the cleaning bar 2 moves to automatically clean and remove the foreign matter as described above. However, foreign matter may adhere not to the orifice 51 but to the tip surface of the valve seat 50, which is the peripheral portion surrounding the orifice 51. In such a case, the orifice 51 will not be clogged, but if a gap occurs between the orifice 51 and the float 70 when the float 70 sits on the valve seat 50, a malfunction such as leakage of drain or steam may occur from this gap.

[0035] In this embodiment, in order to avoid such malfunction, as shown in Figures 2 and 3, a first crushing blade 11 and a second crushing blade 12 (all of which are pointed portions) are provided on a valve seat tip surface 50a formed as a flat surface on the valve seat 50, surrounding the orifice 51 and facing the float 70. That is, as shown in Figures 2 and 3, a first groove 31, a second groove 32, and a third groove 33 are formed in this order from the orifice 51 toward the outside on the valve seat tip surface 50a of the valve seat 50. The first groove 31, the second groove 32, and the third groove 33 each have an arc shape that follows the orifice 51, which has a circular shape.

[0036] The first crushing blade 11 and the second crushing blade 12 are provided at the boundary between the first groove 31, the second groove 32, and the third groove 33. The first crushing blade 11 and the second crushing blade 12 are formed as blades whose tips are pointed toward the surface of the valve seat tip surface 50a, and have an arc shape corresponding to the shapes of the first groove 31, the second groove 32, and the third groove 33, as shown in FIG.

[0037] Since the valve seat 50 in this embodiment has the above-mentioned configuration, it is possible to crush and remove foreign matter adhering to the valve seat tip surface 30a in accordance with the movement of the float 70. That is, the float 70 is affected by the drain flowing into the valve chamber 95, and frequently oscillates while seated on the valve seat 50.

[0038] Therefore, the foreign matter adhering to the valve seat tip surface 30a is repeatedly pressed against the first crushing blade 11 and the second crushing blade 12 by the float spherical surface 70a of the oscillating float 70. As a result, the foreign matter is crushed by the first crushing blade 11 and the second crushing blade 12, and peels off and falls from the valve seat tip surface 30a and is removed. When the float 70 completely opens the orifice 51, the removed foreign matter passes through the orifice 51 together with the retained drain 9 and is discharged.

[0039] In this embodiment, the first crushing blade 11 and the second crushing blade 12 are provided by forming the first groove 31, the second groove 32, and the third groove 33 in the valve seat tip surface 50a of the valve seat 50, but the first crushing blade 11 and the second crushing blade 12 can be provided so as to protrude from the valve seat tip surface 50a without forming the first groove 31, the second groove 32, and the third groove 33. Even in this case, since the first crushing blade 11 has a circular shape as described above, when the float 70 sits on the valve seat 50, the float spherical surface 70a comes into contact with the first crushing blade 11, thereby completely blocking the orifice 51.

[0040] [Second embodiment] Next, a valve seat 250 which is a second embodiment of the valve and the valve seat portion used in the valve according to the present application will be described with reference to Fig. 4. The valve seat 250 in this embodiment is attached to a steam trap 90 (Fig. 1) in place of the valve seat 50 in the first embodiment. As shown in Fig. 4, a semicircular first groove 231, a second groove 232 and a third groove 233 are formed in this order from an orifice 251 toward the outside in a valve seat tip surface 250a of the valve seat 250. The first groove 231, the second groove 232 and the third groove 233 each have an arc shape that follows the orifice 251 which has a circular shape.

[0041] The first crushing blade 211 and the second crushing blade 212 are provided at the boundary between the first groove 231, the second groove 232, and the third groove 233. The first crushing blade 211 and the second crushing blade 212 are formed as blades having a pointed tip toward the surface of the valve seat tip surface 250a, and have an arc shape corresponding to the shapes of the first groove 231, the second groove 232, and the third groove 233.

[0042] The operation of the first crushing blade 211 and the second crushing blade 212, which are subjected to the swinging of the float 70 to crush and remove foreign matter adhering to the valve seat tip surface 250a, is the same as in the first embodiment.

[0043] The first groove 231, the second groove 232, the third groove 233, the first crushing blade 211 and the second crushing blade 212 are formed only on the lower side in the vertical direction of the valve seat tip surface 250a. Therefore, compared to the case where a circular groove is formed around the entire circumference of the orifice, it is easier to perform groove processing and easier to manufacture the valve seat.

[0044] In this embodiment, the first crushing blade 211 and the second crushing blade 212 are formed only below the orifice 251, and foreign matter is likely to adhere to the lower part of the orifice 251 due to its own weight, so that the foreign matter can be efficiently removed. In addition, since the float 70 moves in the direction of the arrow 103 shown in Fig. 1, when the float 70 swings, the opening of the lower part of the orifice 251 becomes large, and the pressing force of the float spherical surface 70a against the first crushing blade 211 and the second crushing blade 212 becomes large. Therefore, the first crushing blade 211 and the second crushing blade 212 arranged below the orifice 251 can reliably crush and remove the foreign matter.

[0045] Both ends of the first groove 231, the second groove 232, and the third groove 233 are formed as gently inclined surfaces so as to continue to the valve seat tip surface 250a. This makes it possible to prevent foreign matter from accumulating and adhering to the boundaries between the first groove 231, the second groove 232, and the third groove 233 and the valve seat tip surface 250a.

[0046] [Third embodiment] Next, a third embodiment of a valve according to the present application and a valve seat portion used in the valve will be described with reference to Fig. 5. A valve seat 350 in this embodiment is attached to a steam trap 90 (Fig. 1) in place of the valve seat 50 in the first embodiment. As shown in Fig. 5, a first groove 331, a second groove 332, and a third groove 333, each of which is linear, are formed in this order from an orifice 351 toward the outside on a valve seat tip surface 350a of the valve seat 350.

[0047] The first groove 331, the second groove 332, and the third groove 333 are formed, so that the first crushing blade 311 and the second crushing blade 312 are provided at the boundary between the grooves. The first crushing blade 311 and the second crushing blade 312 are formed as blades having a pointed tip toward the surface of the valve seat tip surface 350a, and have a linear shape corresponding to the shapes of the first groove 331, the second groove 332, and the third groove 333.

[0048] The operation of the first crushing blade 311 and the second crushing blade 312, which are subjected to the swinging of the float 70 to crush and remove foreign matter adhering to the valve seat tip surface 350a, is the same as in the first embodiment.

[0049] The first groove 331, the second groove 332, the third groove 333, the first crushing blade 311, and the second crushing blade 312 are formed only below the valve seat tip surface 350a in the vertical direction, similar to the valve seat 250 in the second embodiment. Therefore, compared to forming a circular or arc-shaped groove around the entire circumference of the orifice, it is easier to perform groove processing and easier to manufacture the valve seat. Similarly to the valve seat 250 in the second embodiment, foreign matter that tends to adhere below the orifice 351 can be efficiently and reliably crushed and removed by the swinging of the float 70, which opens widely downward.

[0050] In this embodiment, the first groove 331, the second groove 332, and the third groove 333 have both ends open toward the side of the valve seat 350, as shown in Fig. 5. Therefore, when the float 70 is seated on the valve seat 350 (closed valve) and the float spherical surface 70a separates from the valve seat tip surface 350a to open the valve, it is possible to prevent the smooth movement of the float 70 in the direction of the arrow 103 from being hindered by the capillary phenomenon, surface tension, etc. of the drain below the orifice 351. This makes it possible to obtain a proper valve opening operation.

[0051] [Fourth embodiment] Next, a fourth embodiment of the valve and the valve seat portion used in the valve according to the present application will be described with reference to Fig. 6. A valve seat 450 in this embodiment is attached to a steam trap 90 in place of the valve seat 50 in the first embodiment (Fig. 1).

[0052] As shown in FIG. 6, on the valve seat tip surface 450a of the valve seat 450, linear first groove 431, second groove 432, and third groove 433, as well as linear first groove 531, second groove 532, and third groove 533, are formed in that order from the orifice 451 outward in the vertical direction.

[0053] The first groove 431, the second groove 432, and the third groove 433, as well as the first groove 531, the second groove 532, and the third groove 533, are formed, so that the first crushing blade 411 and the second crushing blade 412, as well as the first crushing blade 511 and the second crushing blade 512 are provided at the boundary portions of the grooves. The first crushing blade 411 and the second crushing blade 412, as well as the first crushing blade 511 and the second crushing blade 512 are formed as blades having a pointed tip toward the surface of the valve seat tip surface 450a, and have a linear shape corresponding to the shapes of the first groove 431, the second groove 432, and the third groove 433, as well as the first groove 531, the second groove 532, and the third groove 533.

[0054] Furthermore, in the valve seat tip surface 450a of the valve seat 450, semicircular first groove 631, second groove 632, and third groove 633, as well as arc-shaped first groove 731, second groove 732, and third groove 733 are formed in this order from the orifice 451 outward at both sides of the orifice 451 in the vertical direction. The first groove 631, second groove 632, and third groove 633, as well as the first groove 731, second groove 732, and third groove 733 each have an arc shape that follows the circular orifice 451.

[0055] The first groove 631, the second groove 632, and the third groove 633, as well as the first groove 731, the second groove 732, and the third groove 733, are formed, so that the first crushing blade 611 and the second crushing blade 612, as well as the first crushing blade 711 and the second crushing blade 712 are provided at the boundary portions of the grooves. The first crushing blade 611 and the second crushing blade 612, as well as the first crushing blade 711 and the second crushing blade 712 are formed as blades having a pointed tip toward the surface of the valve seat tip surface 450a, and have an arc shape corresponding to the shapes of the first groove 631, the second groove 632, and the third groove 633, as well as the first groove 731, the second groove 732, and the third groove 733.

[0056] The operation of the first crushing blade 411 and the second crushing blade 412, the first crushing blade 511 and the second crushing blade 512, the first crushing blade 611 and the second crushing blade 612, and the first crushing blade 711 and the second crushing blade 712 formed on the valve seat tip surface 450a to crush and remove material adhering to the valve seat tip surface 450a in response to the oscillation of the float 70 is the same as in the first embodiment.

[0057] Similar to the first groove 331, the second groove 332, and the third groove 333 in the third embodiment, the linear first groove 431, the second groove 432, and the third groove 433, as well as the linear first groove 531, the second groove 532, and the third groove 533, have both ends open toward the sides of the valve seat 450 as shown in Fig. 6. This makes it possible to prevent the smooth movement of the float 70 in the direction of the arrow 103 from being hindered by the capillary phenomenon, surface tension, and the like of the drain, and ensures proper valve opening operation.

[0058] In this embodiment, first groove 431 and first groove 531, and first groove 631 and first groove 731 are formed as grooves that communicate with each other and surround orifice 451, but like the other grooves, first groove 431 and first groove 531 may be configured not to communicate with each other and to open both ends toward the side of valve seat 450. Conversely, all grooves may be formed as grooves that communicate with each other and surround orifice 451, like first groove 431, first groove 531, first groove 631, and first groove 731.

[0059] [Other embodiments] In each of the above-described embodiments, an example has been given in which the valve and the valve seat portion used in the valve according to the present application are applied to a steam trap, but the present invention is not limited to this, and the present invention can be applied to other valves as long as the valve opening of the valve seat portion provided on the flow path is opened and closed by an opening and closing means such as a float.

[0060] In addition, in each of the above-described embodiments, the valve seats 50, 250, 350, and 450 are exemplified as the valve seat portion, but other shapes and structures can be adopted as long as they have a valve port that communicates with a flow path provided in the valve body.

[0061] The grooves and crushing blades provided on the valve seat tip surface are not limited to the shapes and structures shown in the above-mentioned embodiments, and other shapes and structures can be adopted. In addition, in the above-mentioned embodiments, an example in which two crushing blades (first crushing blade and second crushing blade) are provided from the inside to the outside of the orifice is given, but one or three or more can be provided. [Explanation of symbols]

[0062] 11, 211, 311, 411, 511, 611, 711: First crushing blade 12, 212, 312, 412, 512, 612, 712: Second crushing blade 50, 250, 350, 450: Valve seat 50a, 250a, 350a, 450a: Valve seat tip surface 51, 251, 351, 451: Orifice 53: Intermediate chamber 95: Valve chamber 97: Inlet 98: Outlet 99: Outlet 70: Float 91: Upper body 92: Lower body

Claims

1. Valve body, A flow passage provided in the valve body; a valve seat disposed in a valve body, the valve seat having a valve port communicating with the flow passage; a valve body having a spherical shape and arranged so as to be able to oscillate in response to the influence of the flow in the flow passage, the valve body closing or opening the valve port by the spherical surface being seated or lifted off from the valve seat end face; In a valve comprising: The valve seat end surface surrounding the valve port and facing the valve body is a flat surface, and the flat surface includes a pointed portion having a pointed tip, and the foreign matter adhering to the valve seat end surface is crushed by being pressed against the pointed portion by the swing of the valve body. A valve characterized by

2. 2. The valve according to claim 1, A valve characterized in that the pointed portion is formed at least below the valve opening in a vertical direction.

3. 2. The valve according to claim 1, The valve orifice is formed in a circular shape, The valve is characterized in that the pointed portion has an arc shape on the valve seat end surface that follows the circular shape of the valve port.

4. A valve seat portion is disposed in a valve body and has a valve port communicating with a flow path provided in the valve body, a valve body having a spherical shape and arranged so as to be able to oscillate in response to the influence of the flow in the flow path, the valve body having a spherical surface that seats on or releases from the valve seat end surface to close or open the valve port; a valve seat end surface that faces the valve body and surrounds the valve port is a flat surface, the flat surface including a pointed portion having a pointed tip, and the oscillation of the valve body causes foreign matter adhering to the valve seat end surface to be pressed against the pointed portion and pulverized; 1. A valve seat portion for use in a valve.

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