JP4158148B2 - valve - Google Patents

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Publication number
JP4158148B2
JP4158148B2 JP2003051419A JP2003051419A JP4158148B2 JP 4158148 B2 JP4158148 B2 JP 4158148B2 JP 2003051419 A JP2003051419 A JP 2003051419A JP 2003051419 A JP2003051419 A JP 2003051419A JP 4158148 B2 JP4158148 B2 JP 4158148B2
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Japan
Prior art keywords
valve
contact
formed
valve seat
seat
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JP2003051419A
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JP2004257521A (en
Inventor
知久 武田
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三浦工業株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve that allows fluid to flow only in one direction.
[0002]
[Prior art]
Prevents the backflow of fluid, the valve structure to flow only in one direction have been widely used as a check valve and vacuum breaker. There are various types of these valves depending on their structures, and appropriate valves are selected and used according to the conditions of the equipment and piping to be attached. Further, even in the valve seat and the valve body, there are those formed of an elastic material such as rubber called an elastic seal and those formed of an inelastic material such as metal called a metal seal.
[0003]
When the seal by the valve seat or the valve body is an elastic seal, the sealing performance is good, but the pressure resistance is low, and there is a problem that the durability is lacking. Durability is high, but small dust is caught between the valve seat and the valve body, so that the so-called dust biting easily impairs the sealing performance and easily causes back flow, and the impact when closing the valve is also large. There was also a problem of noise.
[0004]
Therefore, as a valve for solving these problems, a valve port is provided on the inflow passage side of the valve chamber of the valve housing in which the inflow passage is formed on one side of the valve chamber provided inside and the outflow passage is formed on the other side. An open valve seat is provided, and in the valve chamber, a guide supported by the inflow passage port and a shaft slidably supported by the guide supported by the outflow passage port are passed. A valve body composed of a first valve body portion made of an elastic material and a second valve body portion made of a hard material such as metal is fixed, and in the valve seat , the first valve body portion is fixed. The first valve seat portion is in contact with the body portion and the second valve seat portion is in contact with the second valve body portion. When the fluid flows backward from the outflow passage to the inflow passage, first , the valve body 1 is in contact with the first valve seat portion, one second valve body in the stomach was made to abut against the second valve seat valve Hisage Is (e.g., see Patent Document 1.).
[0005]
According to such a valve, the first valve body portion made of an elastic material such as rubber ensures the reliability of the seal even if there is a bite of dust, solves the problem of noise, and is made of a hard material such as metal. With the second valve body portion, pressure resistance and durability can be ensured.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-349454
[Problems to be solved by the invention]
However, a first valve body portion made of an elastic material such as rubber, and a second valve body portion made of a hard material such as metal, which are fixed to a shaft slidably supported by the guide as described above. According to the valve having a valve body constituted by the above , the guide that slidably supports the shaft on which the valve body is fixed becomes a resistance and obstructs the flow of fluid, and the valve body is fixed. The sliding resistance between the shaft that is slidably supported and the guide that slidably supports the shaft may hinder the movement of the valve body, and for example, when used as a vacuum breaking valve, the stability of the vacuum breaking pressure may be lost. There is a problem that there is.
[0008]
An object of the present invention is a valve capable of ensuring the reliability, pressure resistance, and durability of a seal, solving the problem of noise, facilitating manufacture by reducing the number of parts, and reducing the cost. Is to provide.
Another object of the present invention is to provide a valve that can improve flow with less fluid resistance.
Another object of the present invention is to provide a valve that can reduce the movement resistance of the valve body.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to an inflow of the valve chamber of a valve housing in which an inflow passage is formed on one side of the valve chamber provided therein and an outflow passage is formed on the other side. aisle, has a valve seat that opens the valve port, the valve in the chamber, when from the inlet passage receiving the fluid pressure to the outlet passage, and moves to the side away from the valve seat the valve port and an open, when subjected to fluid pressure to the inlet passage from the outlet passage, and moves to the valve seat direction, the valve seat and abuts with the valve member to close the valve port, the valve seat is constituted by a second valve seat portion formed of an inelastic material and first valve seat portion formed of an elastic material, when the valve body is moved to the valve seat direction, the valve body is first the first valve seat portion and the contact, and then while maintaining the contact between the first valve seat portion, with the elastic deformation of the first valve seat portion In the valve that is configured to serial and second valve seat portions abuts, the second valve seat portion, a valve port open to the center, the periphery of the valve opening and the second contact seat, said first The one valve seat portion has an annular protrusion that protrudes into the valve chamber on the outer periphery of the second contact seat surface so as to come into contact with the valve body before the second contact seat surface. A first abutment seat surface is formed at the tip of the annular protrusion, and the first abutment seat surface has a concave taper shape that gradually decreases in diameter in a direction in which the valve body moves toward the inflow passage. The second abutment seat surface is formed in a planar shape orthogonal to the direction in which the valve body moves toward the inflow passage, and the valve body is substantially in contact with the first abutment seat surface. A corresponding convex tapered shape is formed, a first contact surface that contacts the first valve seat portion, and a flat surface corresponding to the second contact seat surface. Characterized in that a second abutment surface that abuts the second valve seat portion.
[0010]
From this configuration, when reverse flow of fluid from the outlet passage to the inlet passage, when the valve body is moved to the valve seat direction, the valve element is firstly the first valve seat portion and a contact formed of an elastic material, one had at first since the second valve seat portion formed of an inelastic material to obtain an elastic deformation of the first valve seat portion while maintaining the contact state abuts the valve seat portion, a first valve seat formed of an elastic material With the contact with the part, the reliability of the seal is ensured even if there is a bite of dust, and the impact of the contact with the first valve seat part is buffered by the elastic deformation of the first valve seat part. since the second valve seat portion and the abutment post, generation of noise due to impact is prevented, in addition, by the contact between the second valve seat portion formed of an inelastic material, pressure resistance and durability can be ensured. In addition, since the configuration is simple and the number of parts is small, manufacturing is facilitated and costs can be reduced.
[0011]
Further, the second valve seat portion has a valve opening in the center, and the periphery of the valve mouth serves as a second contact seat surface, and the first valve seat portion is formed on an outer periphery of the second contact seat surface. And an annular protrusion protruding into the valve chamber so as to come into contact with the valve body prior to the second contact seat surface, and a first contact seat surface is formed at a tip of the annular protrusion. Therefore, when the valve body moves in the valve seat direction during the backflow of the fluid from the outflow passage to the inflow passage, the valve body is moved to the first valve seat portion before the second contact seat surface of the second valve seat portion. Since it contacts the first contact seat surface, it is possible to reliably obtain the elastic deformation of the first valve seat portion when the valve body contacts the first valve seat portion.
The first abutting seat surface is formed in a concave taper shape having a gradually decreasing diameter in a direction in which the valve body moves toward the inflow passage, and the second abutting seat surface is formed by the valve body. The valve body is formed in a planar shape orthogonal to the direction of movement toward the inflow passage side, and the valve body is formed in a convex taper shape substantially corresponding to the first contact seat surface, and the first valve seat A first abutting surface that abuts against the portion and a second abutting surface that is formed in a flat shape corresponding to the second abutting seat surface and abuts against the second valve seat portion. When the fluid flows back from the passage to the inflow passage, the valve body moves in the valve seat direction, and when the first contact surface formed in the convex taper shape of the valve body contacts the first contact seat surface, The first abutment seat surface is spread outwardly by the first abutment surface, and this restoring force increases the adhesion between the first abutment surface of the valve body and the first abutment seat surface. , To improve the sealing properties. The second contact seat surface is formed in a planar shape orthogonal to the direction in which the valve body moves toward the inflow passage, and the valve body is formed in a planar shape corresponding to the second contact seat surface. Since the second abutment surface is provided, the second abutment surface of the valve body to which the second abutment seat surface moves can be reliably received, and the first valve made of the elastic material is used. Since the seat portion can be prevented from being deformed more than necessary, pressure resistance and durability can be improved.
According to a second aspect of the invention, according to claim 1, wherein the valve body has a body portion, the side surface of the barrel, that are formed before and after the moving direction to the convex curved surface with small diameter It is characterized by.
[0012]
With this configuration, the body of the valve body that comes into contact with the inner wall of the valve chamber is in point contact, and there is little movement resistance of the valve body, and there is no catching in movement, so that smooth and stable movement of the valve body is obtained. .
[0013]
The invention according to claim 3, according to claim 1 or 2, in the valve chamber wall to prevent movement of more abut the valve body to move to the side away from the valve seat is formed, the valve body, fitting projections of the valve port and loosely if the opening is formed in the valve seat, the fitting projection, the movement to the valve body comes into contact with the wall Even if it exists, the part of the front-end | tip is formed in the length which stops in the said valve opening, It is characterized by the above-mentioned.
[0014]
Move from such a configuration, since the fitting projection formed on the valve body does not come off is in a valve port that opens to the valve seat, without supporting the valve body in the axial or the like in the valve chamber, the valve body to the valve seat direction when can the valve body closes the valve port reliably contacts the valve seat.
[0015]
Invention according to claim 4, characterized in that according to any one of claims 1, 2 or 3, the valve housing, a spring that urges the valve body to the valve seat direction is provided And
[0016]
From this configuration, when the fluid is not flowing from the inflow passage side to the outflow passage side, the valve body is urged by the spring and comes into contact with the valve seat, and the valve port that opens to the valve seat is closed. It can be used not only as a check valve but also as a vacuum breaking valve.
[0017]
According to a fifth aspect of the present invention, the outer periphery of the second valve seat portion according to any one of the first , second, third, or fourth aspect is screwed and attached to the inflow passage of the valve housing. It is characterized by being.
[0018]
With this configuration, the configuration is further simplified and the number of parts can be reduced, so that the manufacture is facilitated and the cost can be further reduced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an example of an embodiment of a valve according to the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a flow path of the valve is open, and FIGS. 2 and 3 are views from an outflow passage. It is a longitudinal cross-sectional view which shows the contact process of a valve body and a valve seat at the time of the backflow of the fluid to an inflow passage.
[0020]
In the valve of this example, an inflow passage 2 is formed on one side of a valve chamber 1 provided inside, and a tubular valve housing 4 in which an outflow passage 3 is formed on the other side, on the inflow passage 2 side of the valve chamber 1. , a valve seat 6 which opens a valve port 5, the valve chamber 1, when subjected to fluid pressure to the inflow passage 2 or et flow out passage 3, move to the side away from the valve seat 6 and opening the valve port 5, when subjected to fluid pressure to flow out passage 3 or et influx passage 2, to move the valve seat 6 direction to close the valve port 5 in contact with the valve seat 6 equivalents valve A body 7 is provided.
[0021]
A female screw 8 is formed on the inner peripheral surface of the inflow passage 2 of the valve housing 4 to be screwed to the inflow side piping. Further, the outer peripheral surface of the cylindrical portion forming the outflow passage 3 of the valve housing 4 is screwed to the outflow side piping. A mating male screw 9 is formed.
[0022]
The valve seat 6 comprises a first valve seat portion 10 and the second valve seat portion 11 for formed of an inelastic material such as metal which is formed of an elastic material such as rubber, the valve body 7 to the valve seat 6 direction when it moves, while maintaining the contact between the first valve seat portion 10 the valve body 7 is first the first valve seat portion 10 in contact, one had, the obtained elastic deformation of the first valve seat portion 10 a second valve seat portion 11 is configured to abut.
[0023]
In particular the further, second valve seat portion 11 of the valve seat 6, the flow path hole 13 which opens the valve port 5 in the center is formed, the periphery of the valve opening 5 and the second contact seat 12 the second contact seat 12 is formed in a planar shape perpendicular to the direction in which the valve body 7 moves to the inlet passage 2 side. The first valve seat 10, second on the outer circumference of the abutment seating surface 12, an annular projection which projects the second contact seat 12 from above into the valve chamber 1 to contact the valve body 7 has 14, first abutment seating surface 15 is formed at the tip of the annular projection 14. The first contact seat 15 This is formed in a concave tapered to be gradually small toward the direction in which the valve body 7 moves to the inlet passage 2 side.
[0024]
In this example, the second valve seat portion 11 of the valve seat 6 includes a base 17 which internal thread 8 and screwable male thread 16 formed in the inflow passage 2 inner circumferential surface of the valve housing 4 is formed, this It is constituted by the cylindrical portion 18 to form a valve port 5 projects into the valve chamber 1 side of the substrate 17. The first valve seat portion 10, on one side surface of the disc-shaped body 20 having a fittable hole 19 in the outer periphery of the cylindrical portion 18 in the center, has a configuration in which the ring-shaped projection 14 is formed . Then, the disk-shaped substrate 20 constituting the first valve seat portion 10, fitted to the outer periphery of the cylindrical portion 18 formed on the base body 17 that make up the second valve seat portion 11, the first valve a seat 10 and a second valve seat portion 11 are held together.
[0025]
In mounting the valve seat 6 configured in this way to the valve housing 4, the base body 17 constituting the second valve seat portion 11 with the first valve seat portion 10 facing the valve chamber 1 side is used as the valve housing. utilizing the fourth inlet channel 2 inside internal thread 8 engaged with the formed inlet pipe on the peripheral surface, it is mounted by screwing a female screw 8. At this time , the valve chamber 1 is formed to have a smaller diameter than the inflow passage 2, and the outer peripheral portion of the disc-shaped base 20 constituting the first valve seat portion 10 is formed between the inflow passage 2 and the valve chamber 1. The base portion 17 constituting the stepped portion 21 and the second valve seat portion 11 is tightened at the end face on the outflow passage 3 side . As a result , the disc-shaped base body 20 constituting the first valve seat portion 10 also functions as a seal member that seals between the valve seat 6 and the valve housing 4. In addition, the seal ring 22 is mounted between the valve seat 6 and the valve housing 4.
[0026]
Further, the valve body 7 that contacts the valve seat 6 configured as described above has a body portion 23 having a predetermined length in the moving direction, and this body portion 23 is in contact with the valve seat 6. A first contact surface 24 formed in a convex taper shape substantially corresponding to the first contact seat surface 15 formed in a concave taper shape of the first valve seat portion 10 on the contact surface side, and a second valve seat The second contact surface 25 is formed in a planar shape corresponding to the second contact seat surface 12 formed in the planar shape of the portion 11, and the first contact surface 24 is the first contact seat surface. 15 and the second contact surface 25 come into contact with the second contact seat surface 12.
[0027]
Further, body portion 23 of the valve body 7 is formed in a smaller diameter slightly than the inner diameter of the valve chamber 1 and the side surface 26 is formed before and after the moving direction to the convex curved surface with small diameter, A side surface 26 of the body portion 23 is supported on the inner wall of the valve chamber 1 by point contact. In addition, the body portion 23, communicating groove 27 for communicating with the inflow passage 2 side outflow passage 3 side within the valve chamber 1 is provided in a plurality of positions in the circumferential direction.
[0028]
Further, the valve chamber 1 which movably accommodates a valve body 7, the wall 28 to prevent movement of more abut the valve body 7 to move to the side away from the valve seat 6 is formed. The moving direction of the length of the body portion 23 of the valve body 7 is in relation to the valve chamber 1, when the valve body 7 is in contact with the wall 28 moves to the side away from the valve seat 6 equivalents, separated by a valve The length is set such that a space necessary for fluid flow can be secured between the body 7 and the valve seat 6.
[0029]
Furthermore, the valve body 7 provided in the valve chamber 1, the contact surface of the valve seat 6, the fitting projection 29 loosely fitting engagement with valve port 5 which opens into the valve seat 6 are formed, the fitting protrusion 29, the valve body 7 is also part of the tip there moved to abut the wall 28 of the valve chamber 1 is formed in a length that remains in the valve outlet 5. Further, fitting protrusions 29 is roughly the same diameter of the base portion and the inner diameter of the valve port 5, moves toward the distal end gradually have tapered guide surfaces 30 that a smaller diameter is formed, the valve body 7 to the valve seat 6 direction when, being guided in the valve port 5 on the guide surface 30 of the fitting protrusions 29 fitted you move to the inner part, the first abutment surface 24 of the valve body 7 is in the first valve seat portion 10 of the valve seat 6 a The first abutment seat surface 15 and the second abutment surface 25 are configured to reliably abut on the second abutment seat surface 12 of the second valve seat portion 11 of the valve seat 6.
[0030]
Also, the valve housing 4, between the outlet passage 3 and the valve chamber 1, a spring 31 for urging the valve body 7 to the valve seat 6 direction. The elastic force of the spring 31, may be a weak elastic force of enough to hold in contact with each other when the valve body 7 and the valve seat 6 equivalents, is not particularly limited and is appropriately selected depending on the application. The spring 31 is not necessarily required when, for example, the valve according to the present invention is used as a check valve, but is essential when used as a vacuum breaking valve.
[0031]
It is configured valve as described above, when a flow of fluid from the inflow passage 2 into the outflow passage 3, the valve port 5 moves in the direction of the valve body 7 separates from the valve seat 6 is pushed by the fluid The fluid flows from the inflow passage 2 to the outflow passage 3. Conversely, when the fluid flows backward from the outflow passage 3 into the inflow passage 2, the valve body 7 in the reverse flow fluid is pushed to move the valve seat 6 direction, the first abutment surface 24 of the valve body 7 is first elastic a first abutment seat surface 15 of the first valve seat portion 10 formed of a material in contact, one first stomach abutment surface 24 and the first while maintaining the contact between the first abutment seat surface 15 The second contact surface 25 of the valve body 7 comes into contact with the second contact seat surface 12 of the second valve seat portion 11 by obtaining elastic deformation of the valve seat portion 10. The first contact seat 15 first abutment surface 24 of the valve body 7 you abutment and is formed in the tip of the annular projection 14, the valve body 7 is the first valve seat portion 10 The elastic deformation of the first valve seat portion 10 when it comes into contact with can be obtained with certainty.
[0032]
Then, in the first abutment surface 24 of the valve body 7 in contact with the first contact seat 15, concave tapered first contact seat 15 is gradually decreasing diameter toward the inlet passage 2 side Further, the first contact surface 24 of the valve body 7 is formed in a convex taper shape substantially corresponding to the first contact seating surface 15, so that the first contact surface 24 is the first contact surface 24. when in contact with the abutment seat surface 15, the first contact seat 15 formed in a concave tapered is spread by a first abutment surface 24 formed on the convex taper shape toward the outer circumference, this restoration depending on the force and the first abutment surface 24 of the valve body 7 adhesion is increased between the first abutment seat surface 15, improved sealing properties, the first abutment surface 24 and the first abutment seat surface 15 Even if there is a dust bit between them, the sealing reliability is ensured and fluid leakage can be surely prevented.
[0033]
In the valve body 7, the impact caused by the contact of the first valve seat portion 10 is buffered by the elastic deformation of the first valve seat portion 10 and then contacts the second valve seat portion 11, so that noise is generated due to the impact. Is prevented.
[0034]
Further, in the contact of the second contact seat surface 12 of the second contact surface 25 and the second valve seat portion 11 of the valve body 7, the second contact seat surface 12 moves the valve body 7 is formed in a planar shape perpendicular to the direction, the second abutment surface 25 of the valve body 7 and is formed in a plane shape corresponding to the second contact seat 12, the second contact seat 12 There can receive reliably second abutment surface 25 of the valve body 7 comes to move, it is possible to prevent the excessive deformation of the first valve seat portion 10 formed by elastic material, pressure resistance and durability It is possible to improve the performance.
[0035]
Further, in this embodiment, in the valve body 7 has a body portion 23 having a predetermined length in the moving direction, the body portion 23 is slightly are formed smaller in diameter than the inner diameter of the valve chamber 1, The side surface 26 is formed in a convex curved surface having a small diameter in the front and rear in the moving direction, and this body portion 23 is supported by the point contact with the inner wall of the valve chamber 1. Since the movement resistance of the valve body 7 is small and the movement is not caught, a smooth and stable movement is obtained in the valve body 7, and particularly when used as a vacuum breaking valve, the vacuum breaking pressure is stabilized.
[0036]
Further, in this embodiment, the valve chamber 1 which movably accommodates a valve body 7, it is formed the wall 28 to prevent movement of more abut the valve body 7 to move to the side away from the valve seat 6 cage, the valve body 7 provided in the valve chamber 1, the contact surface of the valve seat 6, the fitting projection 29 to the valve port 5 and loosely you want to open the valve seat 6 is formed, the fitting fitting protrusions 29, even if there is movement to the valve body 7 contacts the wall 28 of the valve chamber 1, a part of the tip is formed to a length that stops in the valve opening 5, the valve body 7 since the fitting projection 29 formed does not come off it is in a valve port 5 which opens into the valve seat 6 always in, without supporting the valve body 7 in the axial or the like in the valve chamber 1, the valve body 7 valve when moved to the seat 6 direction, it is possible to valve body 7 closes the valve port 5 reliably contact with the valve seat 6. Also, as described above, it is not necessary such as a shaft for supporting the valve body 7, there is no transfer resistance due to that amount of friction, is possible to further stabilize the vacuum breaking pressure when used as a vacuum breaker valve In addition, it is possible to obtain a good flow with less fluid resistance.
[0037]
Further, the fitting projection 29 is roughly the same diameter of the base portion and the inner diameter of the valve port 5, gradually tapered guide surface 30 that is a smaller diameter is formed toward the distal end, the valve body 7 is moved to the valve seat 6 direction when, is guided through the valve port 5 on the guide surface 30 of that mating protrusions 29 move to the inner part, the first abutment surface 24 of the valve body 7 is in the first valve seat portion 10 of the valve seat 6 1 Since the abutment seat surface 15 and the second abutment surface 25 are surely abutted against the second abutment seat surface 12 of the second valve seat portion 11 of the valve seat 6, the valve body 7 can be smoothly moved. Movement and seal integrity are obtained.
[0038]
The further valve according to the present invention, as described above a small number of parts, and also the attachment to the valve housing 4 of the valve seat 6, the second valve the first valve seat portion 10 toward the valve chamber 1 side the substrate 17 constituting the seat portion 11, by utilizing the internal thread 8 to be screwed with the inflow side pipe formed in the inflow passage 2 inner circumferential surface of the valve housing 4, is attached by screwing a female screw 8 Therefore, the female screw 8 is used for both the connection of the inflow side piping and the screwing of the base body 17 constituting the second valve seat portion 11, thereby not only reducing the number of parts but also facilitating manufacturing and reducing the cost. I can plan.
[0039]
【The invention's effect】
According to the valve according to the present invention as described above, reliability of sealing, pressure resistance, to ensure durability, and to solve the noise problem, the further, easily cost production and reduce the number of parts Since it can be reduced and the movement resistance of the valve body can be reduced, a stable vacuum breaking pressure can be obtained particularly when used as a vacuum breaking valve.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which a flow path is open when a fluid is flowing in a forward direction in an example of an embodiment of a valve according to the present invention.
FIG. 2 is a longitudinal sectional view showing a contact process between a valve body and a valve seat when fluid flows backward from the outflow passage to the inflow passage.
FIG. 3 is a longitudinal sectional view showing a contact process between a valve body and a valve seat when a fluid flows backward from the outflow passage to the inflow passage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve chamber 2 Inflow passage 3 Outflow passage 4 Valve housing 5 Valve port 6 Valve seat 7 Valve body 10 1st valve seat part 11 2nd valve seat part 12 2nd contact seat surface 14 Annular protrusion 15 1st contact seat Surface 23 body 24 first contact surface 25 second contact surface 28 wall 29 fitting projection 31 spring

Claims (5)

  1. The valve housing outlet passage on the other side inflow passage is formed on one side of the valve chamber is formed with inside, the inlet passage side of said valve chamber, a valve seat that opens the valve port, said the valve chamber, when from the inlet passage receiving the fluid pressure to the outlet passage, and moves to the side away from the valve seat to open the valve port, the fluid pressure to the inlet passage from the outlet passage when received, it moves to the valve seat direction, comprising a valve body for closing the valve port contact the valve seat and the person, the valve seat, non-elastic material and the first valve seat portion formed of an elastic material in is composed of a second valve seat portion formed, the valve body when moving the valve seat direction, the valve body is first abuts the first valve seat portion, and then between the first valve seat portion while maintaining the contact state, the valve is configured to contact with the second valve seat portion to obtain an elastic deformation of the first valve seat portion Stomach,
    The second valve seat portion has a valve opening in the center, and the periphery of the valve port serves as a second contact seat surface, and the first valve seat portion is arranged on the outer periphery of the second contact seat surface, An annular protrusion protruding into the valve chamber so as to come into contact with the valve body prior to the second contact seat surface, and a first contact seat surface is formed at a tip of the annular protrusion; The first abutting seat surface is formed in a concave taper shape having a gradually decreasing diameter in the direction in which the valve body moves toward the inflow passage, and the second abutting seat surface is formed by the valve body being inflowed. The valve body is formed in a flat shape perpendicular to the direction of movement toward the passage side, and the valve body is formed in a convex taper shape substantially corresponding to the first abutting seat surface, and is in contact with the first valve seat portion. a first contact surface in contact, are formed in a planar shape corresponding to the second contact seat, to characterized in that it has a second valve seat portion and abutting the second abutment surface Valve.
  2. 2. The valve according to claim 1, wherein the valve body has a body portion, and a side surface of the body portion is formed in a convex curved surface having a small diameter in front and rear in the moving direction .
  3. The valve chamber is formed with a wall that abuts a valve body that moves away from the valve seat and prevents further movement. The valve body has a valve opening that is open to the valve seat and a free play. A fitting protrusion is formed, and the fitting protrusion is formed to have such a length that a part of the tip of the fitting protrusion stops in the valve opening even when the valve body moves until it comes into contact with the wall. The valve according to any one of claims 1 and 2 .
  4. The valve according to claim 1, wherein the valve housing is provided with a spring that urges the valve body in the valve seat direction .
  5. 5. The valve according to claim 1, wherein an outer periphery of the second valve seat portion is screwed into the inflow passage of the valve housing .
JP2003051419A 2003-02-27 2003-02-27 valve Active JP4158148B2 (en)

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DE102013220073A1 (en) 2013-10-02 2015-04-16 Parker Hannifin Manufacturing Germany GmbH & Co. KG Connecting element
JP6270544B2 (en) * 2014-02-28 2018-01-31 株式会社吉野工業所 Foam dispenser
WO2018169075A1 (en) * 2017-03-17 2018-09-20 株式会社キッツ Aeration valve and waste water pipe system

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