JP2016223624A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device capable of inhibiting occurrence of rumbling.SOLUTION: A valve device 1 comprises a body part 10 formed with an internal passage 11 in which compressed air passes, a valve element 40 which is housed in the body part 10, is contacted with a valve seat 14 provided in the internal passage 11 to close the internal passage 11 and is separated from the valve seat 14 to open the internal passage 11, a bias member 60 biasing the valve element 40 towards the valve seat 14, and a guide member 30 guiding the valve element 40 in the open and close direction of the valve element 40. The valve element 40 comprises a valve guide 42 which is guided by the body part 10. The valve guide 42 is provided with an internal space SA in which the bias member 60 is inserted. The valve device 1 comprises a recess 45 formed in the valve element 40 and an elastic member 50 installed in the recess 45 as a friction force imparting means which imparts friction force between the valve element 40 and the guide member 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a valve device.

  Conventionally, as an example of a valve device, a check valve that allows a fluid to flow in one direction and does not allow a fluid to flow in a direction opposite to the one direction is known. Such a check valve includes a main body portion in which an internal passage through which fluid flows is formed, and a valve body that is accommodated in the main body portion and is urged toward the valve seat of the main body portion by an urging member. The valve body is based on the relationship between the urging force of the urging member and the force (pressure) applied by the fluid to the valve body in a state where a part of the valve body is slidably inserted into the guide portion formed in the main body portion. By contacting and separating from the valve seat, the internal passage is opened and closed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 2-80819 (FIG. 2)

  By the way, according to the conventional check valve, when the check valve opens the internal passage, that is, when the valve body is separated from the valve seat, the urging force of the valve body by the urging member is applied to the valve body. And a force by which the fluid pushes the valve body. At this time, a ringing may occur when the valve body vibrates in contact with the guide portion. Such a problem is not limited to the check valve, and may occur similarly for the differential pressure valve.

  Then, the objective of this invention is providing the valve apparatus which can suppress generation | occurrence | production of a ringing.

  (1) One form of the valve device according to the present invention is such that a main body portion having an internal passage through which a fluid passes and a valve seat housed in the main body portion and provided in the main body portion are brought into contact with the inner portion. A valve body that closes the passage and opens the internal passage by separating from the valve seat; a biasing member that biases the valve body toward the valve seat; and the valve in the opening and closing direction of the valve body A valve device including a guide portion for guiding a body, wherein the valve body includes a valve guide guided by the guide portion, and the valve guide is provided with an internal space into which the biasing member is inserted. The valve device further includes a friction force applying means for applying a friction force between the valve body and the guide portion.

  According to the present valve device, the frictional force imparting means generates a frictional force between the guide portion and the valve guide when the valve body moves with respect to the guide portion. The valve body is less likely to vibrate in a state separated from the valve seat. Therefore, occurrence of ringing of the valve device can be suppressed.

  (2) According to one aspect dependent on the valve device, the valve body closes the internal passage by contacting the valve seat, and opens the internal passage by separating from the valve seat. And the valve guide guided by the guide portion in accordance with the opening / closing operation of the valve body are integrated so as not to be relatively movable.

  According to this valve device, since the valve guide and the valve move integrally with the opening and closing operation of the valve body, that is, the valve does not move with respect to the valve guide, vibration caused by the movement of the valve with respect to the valve guide is suppressed. can do.

  (3) According to an embodiment dependent on the valve device, the guide part includes an extension part extending toward the valve seat, and the extension part and the valve body are in a clearance fit relationship.

  According to the present valve device, the range in which the guide portion supports the valve body in the opening and closing direction of the valve body is widened, thereby further suppressing the valve body from being inclined with respect to the guide portion. Therefore, when the valve body performs the opening / closing operation, the valve body can smoothly move with respect to the guide portion.

  (4) According to one aspect dependent on the valve device, the valve guide is formed in a cylindrical shape including the internal space, and the valve guide is configured such that an outside of the valve guide and the internal space are in a radial direction. A valve side communication hole communicating with is formed.

The friction force applying means makes it difficult for fluid to flow into the internal space of the valve guide from between the valve body and the guide portion. For this reason, when the pressure in the internal space of the valve guide becomes lower than the pressure outside the valve body, the pressure outside the valve body acts as a drag against the movement of the valve body to the valve seat, and the valve body performs the valve closing operation. When doing so, the valve body may not move quickly to the valve seat.
Therefore, according to the present valve device, the internal space of the valve guide is communicated with the outside through the valve side communication hole of the valve guide, so that the pressure in the internal space of the valve guide is substantially equal to the external pressure. Therefore, when the valve body closes, the valve body easily moves to the valve seat quickly.

  (5) According to one mode dependent on the valve device, the extension portion is formed with a guide side communication hole communicating with the valve side communication hole.

  According to this valve device, the internal space of the valve guide and the outside of the guide portion can be communicated with each other through the guide side communication hole and the valve side communication hole in a state where the valve body is accommodated by the guide portion. For this reason, since the pressure in the internal space of the valve guide is approximately equal to the pressure outside the guide portion, the valve body is easily moved to the valve seat when the valve body is closed.

  (6) According to an embodiment dependent on the valve device, the outside of the guide portion and the valve side communication hole communicate with each other only through a gap between the valve body and the extension portion.

  According to this valve apparatus, the internal space of the valve guide and the outside (internal passage) of the guide portion are communicated with each other via the valve side communication hole of the valve body and the gap between the valve body and the extension portion. Therefore, by using a relatively small gap between the valve body and the extension portion, it is possible to easily suppress the generation of sound due to a rapid flow of fluid between the internal space of the valve guide and the outside of the guide portion. it can.

  (7) One form of the valve device according to the present invention is such that the internal portion is formed by contacting a main body portion formed with an internal passage through which a fluid passes, and a valve seat accommodated in the main body portion and provided in the main body portion. A valve body that closes the passage and opens the internal passage by separating from the valve seat; a biasing member that biases the valve body toward the valve seat; and the valve in the opening and closing direction of the valve body A valve device including a guide unit for guiding a body, wherein the valve body includes a valve guide guided by the guide unit, and the guide unit is configured to perform the valve operation in a direction orthogonal to an opening / closing direction of the valve body. The valve device further includes a frictional force applying means for supporting both a portion of the body facing the valve seat and the valve guide, and applying a frictional force between the valve body and the guide portion.

  According to the present valve device, the frictional force is applied between the guide portion and the valve body when the valve body moves with respect to the valve guide by the frictional force applying means. The valve body is less likely to vibrate in a state separated from the valve seat. Therefore, occurrence of ringing of the valve device can be suppressed.

  (8) According to one aspect dependent on the valve device, the frictional force applying means is formed on one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body. And the elastic member disposed in the concave portion and in contact with the guide portion. The depth dimension of the concave portion is determined by the frictional force generated when the elastic member contacts the guide portion. The value is within the range of.

When the frictional force between the guide portion and the valve body by the frictional force applying means is excessively large, the valve body is difficult to open and close with respect to the guide portion. On the other hand, the frictional force between the guide portion and the valve body increases as the amount of protrusion of the elastic member from the opening of the recess portion of the guide portion increases.
So, according to this valve apparatus, the protrusion amount of the elastic member with respect to the opening part of a recessed part is adjusted by changing the depth dimension of a recessed part. Thereby, the frictional force between the guide portion and the valve body is adjusted so that the frictional force does not become excessively large. For this reason, both suppression of vibration of the valve body and smooth opening / closing operation of the valve body can be achieved.

  (9) According to one aspect dependent on the valve device, the frictional force applying means is formed on one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body. And an elastic member disposed in the recess, the elastic member having a cross-sectional shape such that the frictional force is within a predetermined range.

When the frictional force between the guide portion and the valve body by the frictional force applying means is excessively large, the valve body is difficult to open and close with respect to the guide portion. On the other hand, the frictional force between the guide portion and the valve body increases as the amount of protrusion of the elastic member from the opening of the recess portion of the guide portion increases.
So, according to this valve apparatus, the protrusion amount of the elastic member with respect to the opening part of a recessed part is adjusted by changing the cross-sectional shape of an elastic member. Thereby, the frictional force between the guide portion and the valve body is adjusted so that the frictional force does not become excessively large. For this reason, both suppression of vibration of the valve body and smooth opening / closing operation of the valve body can be achieved. In addition, the frictional force between the guide portion and the valve body can be adjusted afterwards by replacing the elastic member during maintenance of the valve device or the like. Therefore, the frictional force between the guide portion and the valve body can be easily adjusted to an appropriate value.

  (10) According to one mode dependent on the valve device, the frictional force applying means is formed on one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body. A plurality of recesses and an elastic member disposed in at least one of the plurality of recesses, and the number of the elastic members is such that the frictional force is within a predetermined range.

When the frictional force between the guide portion and the valve body by the frictional force applying means is excessively large, the valve body is difficult to open and close with respect to the guide portion. On the other hand, the frictional force between the guide portion and the valve body increases as the number of elastic members increases.
So, according to this valve apparatus, the frictional force between a guide part and a valve body is adjusted by changing the number of elastic members. Thereby, the frictional force between the guide portion and the valve body is adjusted so that the frictional force does not become excessively large. For this reason, both suppression of vibration of the valve body and smooth opening / closing operation of the valve body can be achieved. In addition, the frictional force between the guide portion and the valve body can be adjusted afterwards by changing the number of elastic members during maintenance of the valve device. Therefore, the frictional force between the guide portion and the valve body can be easily adjusted to an appropriate value.

  (11) According to one aspect dependent on the valve device, the frictional force applying means is formed on one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body. And an elastic member disposed in the recess, and the elastic member is made of a material such that the frictional force is within a predetermined range.

When the frictional force between the guide portion and the valve body by the frictional force applying means is excessively large, the valve body is difficult to open and close with respect to the guide portion. On the other hand, the friction coefficient between one of the guide part and the valve body and the elastic member is changed depending on the material of the elastic member. For this reason, the frictional force between a guide part and a valve body is changed according to the material of an elastic member.
So, according to this valve apparatus, the frictional force between a guide part and a valve body is adjusted by changing the material of an elastic member. Thereby, the frictional force between the guide portion and the valve body is adjusted so that the frictional force does not become excessively large. For this reason, both suppression of vibration of the valve body and smooth opening / closing operation of the valve body can be achieved. In addition, at the time of maintenance of the valve device, the frictional force between the guide portion and the valve body can be adjusted afterwards by replacing the elastic member with a different material. Therefore, the frictional force between the guide portion and the valve body can be easily adjusted to an appropriate value.

  (12) According to one form dependent on the said valve apparatus, the said elastic member is an O-ring or MY packing.

  According to this valve device, the elastic member can be easily and inexpensively obtained by using an O-ring or MY packing that is standardized and has a large amount of product flow. For this reason, when exchanging an elastic member at the time of maintenance of a valve device, an elastic member can be easily prepared.

  (13) According to one aspect dependent on the valve device, a cushion is provided on one of a portion of the valve body facing the valve seat and a portion of the valve seat facing the valve body. Yes.

  According to this valve device, the impact applied to the valve body and the valve seat when the valve body is closed by the cushion is mitigated.

  (14) According to one aspect dependent on the valve device, the cushion is provided only in a portion of the valve body facing the valve seat.

  According to this valve device, since the cushion is provided only on the valve body, the valve body may be replaced when the cushion needs to be replaced during maintenance of the valve device. For this reason, as compared with the configuration in which the cushion is provided on the valve seat, the maintenance of the valve device can be easily performed, and the cost of parts replacement when the cushion is deteriorated can be reduced.

  (15) According to one aspect dependent on the valve device, the cushion is detachably attached to the valve body.

  According to this valve device, when it is necessary to replace the cushion, it is only necessary to remove the cushion from the valve body and replace only the cushion. The replacement cost can be reduced.

  (16) According to an embodiment dependent on the valve device, the valve body closes the internal passage by contacting the valve seat and opens the internal passage by separating from the valve seat. And the valve guide guided by the guide portion in accordance with the opening / closing operation of the valve body, and the valve guide and the valve operate integrally, and the opening / closing direction of the valve body In the above, a gap is formed between the valve body and the valve guide, and a cushion spacer is disposed in the gap.

  According to this valve device, the cushion spacer between the valve and the valve guide makes contact with the cushion spacer when the valve moves relative to the valve guide, thereby avoiding a direct collision between the valve and the valve guide. ing. For this reason, the vibration and noise resulting from the collision between the valve and the valve guide can be reduced.

  According to this valve device, the occurrence of ringing can be suppressed.

The top view of 1st Embodiment of a valve apparatus. It is sectional drawing of the DD line | wire of FIG. 1, and sectional drawing of the state which the valve unit and the main-body part isolate | separated. Sectional drawing which expanded the elastic member and its periphery in the valve unit of FIG. Sectional drawing of the DD line | wire of FIG. Sectional drawing which expanded the valve body and its periphery in a valve opening state of a valve apparatus. Sectional drawing of 2nd Embodiment of a valve apparatus. Sectional drawing of 3rd Embodiment of a valve apparatus. Sectional drawing of 4th Embodiment of a valve apparatus. Sectional drawing of 5th Embodiment of a valve apparatus. Sectional drawing which expanded the valve body and its periphery in a valve opening state of a valve apparatus. Sectional drawing which expanded the valve body and valve seat just before a valve apparatus will be in a valve closing state. Sectional drawing which shows the plug in the valve apparatus of the modification 1, and its periphery. Sectional drawing which expanded the elastic member in the valve apparatus of the modification 3, and its periphery. Sectional drawing of the valve body in the valve apparatus of the modification 5. FIG.

(First embodiment)
A valve device according to a first embodiment will be described with reference to the drawings. In addition, the valve apparatus of this embodiment is comprised with the non-return valve which accept | permits that the compressed air which is an example of a fluid distribute | circulates to one direction, and does not accept | permit the direction opposite to one direction. The fluid may be a liquid such as oil or water instead of a gas such as compressed air.

  As shown in FIG. 1, the valve device 1 includes a main body 10 in which an internal passage 11 that constitutes a flow path of compressed air is formed, and is detachably attached to the main body 10, and the internal passage 11 is opened (opened). And a valve unit 20 that switches between closing and closing (valve closing). The main body portion 10 is formed of a steel material such as stainless steel, and is separate from the first connection portion 12 for connecting to a pipe (not shown) on the upstream side of the internal passage 11 and the above-described pipe on the downstream side of the internal passage 11. And a second connecting portion 13 for connecting to a pipe (not shown).

  As shown in FIG. 2, a partition wall 10 </ b> A that partitions the internal passage 11 is formed in the main body 10. A through hole 10B that penetrates the partition wall 10A in the opening / closing direction of the valve unit 20 and forms a part of the internal passage 11 is formed in the partition wall 10A. A valve seat 14 is formed on the periphery of the partition wall 10A in which the through hole 10B is formed.

  A mounting opening 15 is formed in a portion of the outer wall of the main body 10 facing the opening of the valve seat 14. A screw portion 16 is formed on the inner peripheral portion of the mounting opening 15. The valve unit 20 is attached to the attachment opening 15.

  The valve unit 20 includes a covered cylindrical plug 21. A screw portion 23 and a flange 24 are formed on the outer peripheral portion of the cylindrical portion 22 of the plug 21. On the other hand, a stepped portion 26 is formed at the boundary between the cylindrical portion 22 and the lid portion 25 in the inner peripheral portion of the cylindrical portion 22 of the plug 21. A cylindrical support portion 27 protruding from the lid portion 25 is formed at the center of the lid portion 25. A cylindrical support pin 28 is fixed to the support portion 27 by, for example, press-fitting.

  A cylindrical guide member 30 made of brass, for example, is fixed to the inner peripheral portion of the cylindrical portion 22 of the plug 21. The position of the guide member 30 with respect to the plug 21 is determined by contacting the step portion 26 of the plug 21.

  A part of the valve body 40 that is accommodated in the main body 10 and opens (opens) and closes (closes) the internal passage 11 by being brought into contact with and away from the valve seat 14 in the guide member 30. Is inserted. Thereby, the guide member 30 guides the valve body 40 in the opening / closing direction of the valve body 40. The valve body 40 includes a valve 41 that faces the valve seat 14 and a cylindrical valve guide 42 that extends from the valve 41 toward the plug 21 and is guided by the guide member 30. The valve 41 and the valve guide 42 are integrally formed of, for example, a single brass member. The outer diameter of the valve 41 is larger than the outer diameter of the valve guide 42. The valve guide 42 is inserted into the guide member 30.

A rubber cushion 46 is inseparably fixed to the portion of the valve 41 facing the valve seat 14 by baking. That is, the cushion 46 is a part of the valve 41.
In the inner space SA of the valve guide 42, a reduced diameter portion 43 is formed in the inner peripheral portion on the valve 41 side. A communication hole 44, which is an example of a valve side communication hole, is formed in the reduced diameter portion 43 at a position 180 degrees away from the central axis of the valve guide 42. The communication hole 44 communicates the internal space SA and the outside of the valve body 40 in a radial direction that is a direction orthogonal to the opening / closing direction. Note that the number of the communication holes 44 may be one or three or more.

  A biasing member 60 is inserted into the internal space SA of the valve guide 42. An example of the urging member 60 is a coil spring. One end side of the urging member 60 is inserted into the support pin 28, and the other end side of the urging member 60 is inserted into the reduced diameter portion 43 and is in contact with the valve 41.

  An annular recess 45 is formed in a portion of the valve guide 42 inserted into the guide member 30. An elastic member 50 that is an O-ring is attached to the recess 45. In the present embodiment, the concave portion 45 of the valve body 40 and the elastic member 50 attached to the concave portion 45 constitute a frictional force applying means.

  As shown in FIG. 3, the depth dimension LH defined by the distance between the inner peripheral surface of the guide member 30 and the bottom surface 45A of the recess 45 is a standard (for example, JIS standard) based on the size of the O-ring. Greater than the depth dimension LR determined by JIS B2401) (LH> LR). The depth dimension LR indicates the distance from the inner peripheral surface of the guide member 30 to the two-dot chain line that is the bottom surface of the virtual recess. For this reason, the amount of protrusion of the elastic member 50 from the opening 45B (broken line) of the recess 45, that is, the amount of protrusion PL of the elastic member 50 from the outer peripheral surface 42A of the valve guide 42 is a recess (two-dot chain line) determined by the standard. The amount of protrusion of the elastic member 50 attached to the outer peripheral surface 42A of the valve guide 42 is smaller. The depth dimension LH of the present embodiment is such that the elastic member 50 ensures the sealing performance between the valve guide 42 and the guide member 30, but the frictional force between the guide member 30 and the valve guide 42 is within the reference range. It is set to become. Note that the reference range is larger than the upper limit value of the frictional force at which the valve body 40 vibrates and generates ringing, and the valve body 40 has the valve seat 14 (FIG. 2) by the urging force of the urging member 60 (see FIG. 2). It is less than or equal to the upper limit of the frictional force that can move quickly toward the reference), and is preset by a test or the like.

  As shown in FIG. 4, in a state where a part of the valve guide 42 of the valve body 40 is inserted into the guide member 30 fixed to the plug 21, the elastic member 50 is between the guide member 30 and the recess 45. It is compressed with. Thereby, since the elastic member 50 presses the guide member 30, a frictional force is generated between the guide member 30 and the valve guide 42. As described above, this frictional force has a magnitude within the reference range.

  In the valve unit 20 having such a configuration, the threaded portion 23 of the plug 21 is screwed into the threaded portion 16 of the main body 10 until the flange 24 of the plug 21 contacts the peripheral edge of the mounting opening 15 of the main body 10. Attached to the main body 10. In this state, the urging member 60 presses the cushion 46 of the valve 41 of the valve body 40 against the valve seat 14. Accordingly, the valve device 1 includes an upstream passage 11A on the first connection portion 12 side of the valve seat 14 in the internal passage 11 and a second connection portion 13 side of the valve seat 14 in the internal passage 11. A closed valve state is established in which communication with the downstream passage 11B is blocked, that is, the internal passage 11 is closed.

With reference to FIG. 5, operation | movement of the valve apparatus 1 is demonstrated with an effect.
When the valve device 1 is in the closed state, when compressed air flows into the upstream passage 11A from the first connecting portion 12 (see FIG. 4), the compressed air gives a force for separating the valve 41 from the valve seat 14. When the valve 41 is separated from the valve seat 14 against the urging force of the urging member 60 applied to the valve 41, the internal passage 11 is opened and the valve device 1 is opened. Accordingly, the upstream passage 11A and the downstream passage 11B communicate with each other, and the compressed air in the upstream passage 11A flows into the downstream passage 11B.

  When such a valve body 40 is maintained in a state of being separated from the valve seat 14, the compressed air forces the valve body 40 away from the valve seat 14, and the biasing member 60 directs the valve body 40 toward the valve seat 14. The pushing force and the sum of the pushing force of the compressed air in the downstream passage 11B pushing the valve body 40 toward the valve seat 14 are substantially balanced. In this state, the compressed air flows from the upstream passage 11A to the downstream passage 11B via the valve 41, so that the force applied to the valve 41 works to vibrate the valve body 40 in the opening and closing direction.

  However, when the valve body 40 is about to vibrate with respect to the guide member 30 due to the elastic member 50 attached to the concave portion 45 of the valve guide 42, there is friction between the valve body 40 (elastic member 50) and the guide member 30. Since a force is generated, this frictional force becomes a resistance against a force that vibrates the valve body 40. For this reason, generation | occurrence | production of a ringing can be suppressed by the vibration of the valve body 40 being suppressed.

  By the way, when it is assumed that the frictional force between the valve body 40 and the guide member 30 by the elastic member 50 is excessively large, the urging member 60 makes it difficult for the valve body 40 to move toward the valve seat 14. That is, the valve closing operation of the valve device 1 is delayed. For this reason, when the valve device 1 is closed, the compressed air may flow from the downstream side passage 11B to the upstream side passage 11A.

  In this respect, the valve device 1 of the present embodiment is configured so that the depth LH (see FIG. 3) between the recess 45 formed in the valve guide 42 of the valve body 40 and the guide member 30 is the same as the guide member 30 and the valve guide. Since the frictional force with respect to 42 is set to be within the reference range, it is possible to suppress the valve closing operation of the valve body 40 from being delayed. Therefore, both the suppression of the occurrence of vibration of the valve body 40 and the quick movement of the valve device 1 from the valve open state to the valve close state can be achieved.

According to the valve device 1 of the present embodiment, for example, the following effects can be obtained in addition to the above-described effects.
(1) Since an O-ring that is standardized and has a large amount of circulation is used as the elastic member 50, the elastic member 50 can be easily obtained at low cost. For this reason, when it is necessary to replace the elastic member 50 during the maintenance of the valve device 1, the elastic member 50 to be replaced can be easily prepared.

  (2) The valve guide 42 is formed with a communication hole 44 that communicates the internal space SA into which the urging member 60 of the valve guide 42 is inserted and the outside of the valve guide 42 in the radial direction. For this reason, the pressure of the internal passage 11 outside the valve body 40 and the pressure of the internal space SA are substantially equal. Therefore, the valve body 40 can quickly move to the valve seat 14 when the valve device 1 is switched from the open state to the closed state.

Further, a configuration in which the urging member 60 is not inserted into the internal space SA of the valve guide 42, that is, a configuration in which the urging member 60 and the valve guide 42 are disposed adjacent to each other in the opening / closing direction (hereinafter referred to as “comparison configuration”). If it is assumed, the plug 21 needs to be formed with a space for accommodating the valve guide 42 and a space for accommodating the biasing member 60 aligned in the opening and closing direction. For this reason, it is necessary to increase the size of the plug 21 in the opening and closing direction. For this reason, when the valve unit of the off-the-shelf valve device is replaced with a comparative configuration during maintenance of the off-the-shelf valve device, the size of the valve device after the valve unit is replaced increases. For this reason, there exists a possibility that the valve apparatus after the valve unit is replaced may interfere with surrounding members.
On the other hand, the valve unit 20 of the present embodiment has a configuration in which the biasing member 60 is inserted into the internal space SA of the valve guide 42, and therefore can suppress an increase in the size of the plug 21 in the opening / closing direction. An increase in the size of can be suppressed. For this reason, at the time of maintenance of the ready-made valve device, even if the ready-made valve unit is replaced with the valve unit 20 of the present embodiment, the valve device 1 can be prevented from interfering with the surrounding members.

(3) The cushion 46 is provided only on the valve body 40 of the valve body 40 and the valve seat 14. For this reason, since it is avoided that the metal valve 41 and the metal valve seat 14 contact directly, when the valve body 40 contacts the valve seat 14 with valve closing operation, the valve body 40 or The impact applied to the valve seat 14 is reduced. In addition, since the cushion 46 is not provided on either the valve body 40 or the valve seat 14, the valve 41 is compared with the configuration in which the metal valve 41 and the metal valve seat 14 are in direct contact with each other. The sealing performance with the valve seat 14 can be enhanced.
Further, when the cushion 46 needs to be replaced due to the deterioration of the cushion 46 during the maintenance of the valve device 1, the valve body 40 may be replaced, that is, the main body 10 including the valve seat 14. Therefore, it is possible to reduce the cost of parts replacement when the cushion 46 is deteriorated.

  (4) The valve 41 and the valve guide 42 are constituted by a single member. That is, the valve 41 and the valve guide 42 are integrated so that relative movement is impossible. Accordingly, the valve 41 and the valve guide 42 move together with the opening / closing operation of the valve body 40, and thus the valve 41 does not move relative to the valve guide 42. For this reason, generation | occurrence | production of the vibration resulting from the movement of the valve 41 with respect to the valve guide 42 can be prevented.

(Second Embodiment)
With reference to FIG. 6, the structure of the valve apparatus 1 of 2nd Embodiment is demonstrated. In addition, in the valve apparatus 1 of 2nd Embodiment, the same code | symbol is used for the component which is common in the structure of the valve apparatus 1 of 1st Embodiment, and the one part or all part of the description is abbreviate | omitted.

As shown in FIG. 6, the valve device 1 of the present embodiment has a shorter dimension of the valve guide 42 in the opening / closing direction of the valve body 40 than the valve guide 42 of the valve device 1 of the first embodiment.
Moreover, the valve apparatus 1 of this embodiment differs in the shape of the guide member which is an example of a guide part from the valve apparatus 1 of 1st Embodiment. The guide member 70 of this embodiment includes a cylindrical fixing portion 71 that is fixed to the cylindrical portion 22 of the plug 21. An annular flange 72 extending outward in the radial direction of the fixed portion 71 is formed at the end of the fixed portion 71 on the valve 41 side. A cylindrical extension 73 extending toward the valve 41 is formed on the outer peripheral edge of the flange 72. The inner peripheral surface 73 </ b> A of the extension portion 73 can contact the outer peripheral surface 41 </ b> A of the valve 41 of the valve body 40. Specifically, the extension 73 and the valve 41 are in a clearance fit relationship.

  When the flange 72 of the guide member 70 comes into contact with the tip of the cylindrical portion 22 of the plug 21, the position of the guide member 70 with respect to the plug 21 is determined. The distal end portion of the fixing portion 71 is located closer to the valve 41 than the step portion 26 of the plug 21. Thereby, it is suppressed that the dimension of the fixing | fixed part 71 in the opening / closing direction of the valve body 40 becomes long.

  A communication that is an example of a guide side communication hole that communicates the inside and the outside of the guide member 70 in the radial direction at a position 180 degrees apart around the central axis of the guide member 70 at the boundary portion between the flange 72 and the extension 73. A hole 74 is formed. The communication hole 74 communicates with the communication hole 44 of the valve body 40 through the internal space SB. As shown in FIG. 6, the communication hole 74 is located closer to the plug 21 than the opening 13 </ b> A of the second connection portion 13. Further, the communication hole 74 is formed closer to the plug 21 than the communication hole 44 of the valve body 40. Note that one or three or more communication holes 74 may be provided. Further, the communication hole 74 may be formed to face the communication hole 44 of the valve body 40.

According to this embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
(5) Since the valve 41 of the valve body 40 and the extension portion 73 of the guide member 70 are in a clearance fit relationship, the outer peripheral surface 41A of the valve 41 can contact the inner peripheral surface 73A of the extension portion 73. For this reason, the extension part 73 supports the valve 41 when the valve body 40 is inclined with respect to the guide member 70. Thereby, the inclination of the valve body 40 can be made small.

  (6) Since the dimension of the valve guide 42 and the dimension of the fixing portion 71 of the guide member 70 in the opening / closing direction of the valve body 40 are shortened, the flange 72 of the guide member 70 and the guide member 30 of the first embodiment Even if the extension 73 is added, an increase in the weight of the valve device 1 is suppressed.

  (7) A communication hole 74 that communicates with the communication hole 44 of the valve body 40 is formed in the guide member 70. According to this configuration, in a state where the valve body 40 is accommodated in the guide member 70 and the plug 21, the internal space SA of the valve guide 42 and the outside of the guide member 70 are communicated through the communication hole 74 and the communication hole 44. Can do. For this reason, since the pressure in the internal space SA of the valve guide 42 and the pressure outside the guide member 70 are substantially equal, the valve body 40 can easily move to the valve seat 14 quickly when the valve body 40 is closed. .

(Third embodiment)
With reference to FIG. 7, the structure of the valve apparatus 1 of 3rd Embodiment is demonstrated. In addition, in the valve apparatus 1 of 3rd Embodiment, the same code | symbol is used for the component which is common in the structure of the valve apparatus 1 of 1st Embodiment, and the one part or all part of the description is abbreviate | omitted.

  As shown in FIG. 7, in the valve device 1 of the present embodiment, the structure for fixing the valve 41 and the cushion is different from that of the valve device 1 of the first embodiment. In the valve 41 of the present embodiment, an annular housing recess 47 and a screw hole 48 that penetrates the valve 41 in the opening / closing direction of the valve body 40 inside the housing recess 47 are formed in a portion facing the valve seat 14. ing. An annular cushion 49 is fitted in the housing recess 47. The valve 41 is provided with a fixing mechanism 80 that detachably fixes the cushion 49.

  The fixing mechanism 80 includes a holder 81 that sandwiches the cushion 49 with the valve 41, a bolt 82 that is screwed into the screw hole 48, and a locking nut 83 that sandwiches the holder 81 with the cushion 49. At the center portion of the holder 81, a bolt 82 is inserted, and a cylindrical protrusion 81A that protrudes toward the valve 41 is formed. As shown in FIG. 7, when the holder 81 is attached to the valve body 40, the protrusion 81 </ b> A is in contact with the valve 41.

According to this embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
(8) The cushion 49 is detachably attached to the valve 41 by the fixing mechanism 80. For this reason, when it is necessary to replace the cushion 49 due to the deterioration of the cushion 49, it is only necessary to replace the cushion 49. That is, it is possible to cope with the minimum part replacement. For this reason, the cost of parts replacement when the cushion 49 deteriorates can be reduced.

(Fourth embodiment)
With reference to FIG. 8, the structure of the valve apparatus 1 of 4th Embodiment is demonstrated. In addition, in the valve apparatus 1 of 4th Embodiment, the same code | symbol is used for the component which is common in the structure of the valve apparatus 1 of 1st Embodiment, and a part or all of the description is abbreviate | omitted.

  As shown in FIG. 8, the valve device 1 of the present embodiment is different from the valve device 1 of the first embodiment in that the valve body is individually formed by two members of a valve and a valve guide. The valve body 90 of the present embodiment is configured such that the valve member 91 is accommodated in the valve guide 94. The valve guide 94 includes a cylindrical insertion portion 95 that is inserted into the guide member 30. The insertion portion 95 is formed with an annular recess 95A. The elastic member 50 is attached to the recess 95A. The depth dimension between the recess 95A and the guide member 30 is the same as the depth dimension LH (see FIG. 3) between the recess 45 of the valve body 40 and the guide member 30 of the first embodiment.

  A flange 96 extending toward the outer side in the radial direction of the insertion portion 95 is formed at the end of the insertion portion 95 on the valve seat 14 side. A cylindrical extension 97 extending toward the valve seat 14 is formed on the outer edge of the flange 96. A communication hole 96 </ b> A that communicates the inside and the outside of the valve guide 94 is formed in the flange 96 at a position 180 degrees apart about the central axis of the valve guide 94. Note that one or three or more communication holes 96A may be provided.

  The valve member 91 is accommodated in the extension 97. The valve member 91 has a configuration in which a rubber cushion 93 is integrated with a core material 92, which is a metal disk, by insert molding, for example. A gap G is formed between the valve member 91 and the flange 96 of the valve guide 94. In the gap G, a rubber cushion spacer 98 formed in an annular shape is arranged. Further, the valve member 91 is configured such that the valve member 91 is not dropped from the valve guide 94 by a retaining ring 99 attached to the extension 97 on the side opposite to the cushion spacer 98 with respect to the valve member 91. Thereby, when the valve body 40 opens and closes, the valve member 91 and the valve guide 94 move together.

According to this embodiment, in addition to the effects other than (4) of the first embodiment, the following effects can be obtained.
(9) Since the valve body 90 is constituted by the valve member 91 and the valve guide 94, when the cushion 93 needs to be replaced due to deterioration of the cushion 93 of the valve member 91, the valve member 91 is replaced with the valve guide 94. And the valve member 91 is replaced. For this reason, compared with the case where all the valve bodies 90 are replaced | exchanged, the cost of parts replacement | exchange when the cushion 93 deteriorates can be reduced.

By the way, when the valve body is constituted by two members of the valve member and the valve guide, the valve member may move relative to the valve guide with the opening and closing operation of the valve body, and the valve member may collide with the valve guide. is there. Thereby, the collision sound caused by the collision between the valve member and the valve guide may be noise.
Therefore, in the present embodiment, the cushion spacer 98 is disposed between the valve member 91 and the valve guide 94, so that the valve member 91 and the valve guide 94 are in direct contact with each other in the opening / closing direction of the valve body 90. Is avoided. For this reason, the vibration and noise of the valve body 90 resulting from the collision between the valve member 91 and the valve guide 94 can be reduced.

  (10) The cushion spacer 98 is made of rubber. For this reason, even if the valve member 91 moves and collides with the cushion spacer 98, the collision is mitigated by the cushion spacer 98. Therefore, the occurrence of vibration of the valve body 90 due to the collision of the valve member 91 with the valve guide 94 can be further suppressed.

(Fifth embodiment)
With reference to FIGS. 9-11, the structure of the valve apparatus 1 of 5th Embodiment is demonstrated. In addition, in the valve apparatus 1 of 5th Embodiment, the same code | symbol is used for the component which is common in the structure of the valve apparatus 1 of 2nd Embodiment, and a part or all of the description is abbreviate | omitted.

  As shown in FIG. 9, the valve device 1 of the present embodiment has the communication hole 74 of the guide member 70 omitted as compared with the valve device 1 of the second embodiment, and the valve body 40 sandwiches the shaft center. The difference is that one of the pair of communication holes 44 arranged to face each other is omitted. Further, the valve device 1 of the present embodiment has a plurality of communication grooves 75 formed at intervals in the circumferential direction of the flange 72 in the flange 72 of the guide member 70 as compared with the valve device 1 of the second embodiment. It differs in that it was added. In the present embodiment, the guide member 70 is formed on the flange 72 as a pair of communication grooves 75 that are opposed to each other with the axis interposed therebetween. The communication groove 75 extends between the inner peripheral surface of the fixed portion 71 and the inner peripheral surface of the extension portion 73. For this reason, as shown in FIG. 10, a gap is reliably formed between the flange 72 and the valve 41 even when the valve device 1 is in the valve open state.

  Moreover, in the valve apparatus 1 of this embodiment, the shape of the cushion 46 of the valve body 40 differs compared with the valve apparatus 1 of 2nd Embodiment. The cushion 46 includes a flat cushion body 46A that is fixed to the valve 41, and an annular projecting portion 46B that projects from the cushion body 46A in the closing direction. The cushion body 46A and the protrusion 46B are integrally formed. As shown in FIG. 9, when the valve body 40 is in the closed state, the protrusion 46 </ b> B is located on the inner peripheral side of the valve seat 14 and in the direction perpendicular to the opening / closing direction of the valve body 40, A slight gap is formed between the through hole 10B on the side. The cushion body 46A and the protrusion 46B may be formed separately, and the protrusion 46B may be fixed to the lower surface of the cushion body 46A. Further, the protrusion 46B may have a flat plate shape in addition to the annular shape.

Next, the function and effect of the valve device 1 will be described.
As indicated by the thick arrows in FIG. 10, in the valve device 1, the internal passage 11 (outside of the guide member 70) is interposed through a gap formed between the valve 41 and the extension 73 of the guide member 70. It communicates with the internal space SB between the guide member 70 and the valve body 40. The internal space SB communicates with the internal space SA in which the urging member 60 is disposed via the communication hole 44 of the valve body 40. That is, the outside of the guide member 70 and the communication hole (valve side communication hole) 44 communicate with each other only through a gap between the valve body 40 and the extension 73 of the guide member 70. According to this, due to the rapid flow of compressed air between the internal space SB of the valve body 40 and the outside of the guide member 70 using a relatively small gap between the valve body 40 and the extension 73. Generation of airflow noise can be easily suppressed. In addition, since the communication hole 44 of the valve body 40 is not provided at an opposing position across the axis of the valve body 40, the generation of airflow noise due to the compressed air passing straight through the plurality of communication holes 44 is prevented. Can be suppressed.

  Further, as shown in FIG. 11, for example, a state immediately before the valve closing state when the valve body 40 operates from the valve opening state to the valve closing state, that is, the differential pressure between the upstream side passage 11A and the downstream side passage 11B is When the valve body 40 is small, the valve body 40 is in an open state, but the gap between the valve body 40 and the valve seat 14 in the opening and closing direction is small. And since the state which the protrusion part 46B of the cushion 46 was located in the inner peripheral side of the valve seat 14 is maintained, there is a slight gap between the protrusion part 46B and the through hole 10B on the inner peripheral side of the valve seat 14. Is formed. Thereby, compared with the valve apparatus provided with the cushion 46 which does not have the protrusion part 46B, the distance of the slight clearance gap between the valve body 40, the valve seat 14, and the through-hole 10B becomes long. Thereby, generation | occurrence | production of the airflow sound of the compressed air which passes the slight clearance gap between the valve body 40 and the valve seat 14 can be suppressed. In addition, according to the valve apparatus 1 of this embodiment, the effect similar to the effect of (5) and (6) of 2nd Embodiment can be acquired.

(Modification)
The description regarding each said embodiment is an illustration of the form which the valve apparatus according to this invention can take, and it does not intend restrict | limiting the form. The valve device according to the present invention may take a form in which at least two embodiments that do not contradict each other among the above embodiments are combined. In addition, the valve device according to the present invention can take a form in which, in addition to the above-described embodiments, for example, the following modifications of the above-described embodiments and at least two modifications that do not contradict each other are combined.

(Modification 1)
In each of the above embodiments, a plurality of the recesses 45 and 95A of the valve bodies 40 and 90 may be formed. The elastic member 50 is attached to at least one of the plurality of recesses 45 and 95A. That is, the number of the recesses 45 and 95A and the number of the elastic members 50 may be different. In short, the number of elastic members 50 can be adjusted so that the frictional force between the guide members 30 and 70 and the valve bodies 40 and 90 is within the reference range.
As an example, as shown in FIG. 12, two recesses 45 are formed in the valve guide 42 of the valve body 40 so as to be separated from each other. An elastic member 50 is attached to each recess 45. Thereby, for example, with one elastic member 50, the frictional force between the guide member 30 and the valve body 40 is smaller than the lower limit value of the reference range, so that the vibration of the valve body 40 cannot be sufficiently suppressed. In this case, the frictional force between the guide member 30 and the valve body 40 is increased by the two elastic members 50 so that the frictional force is within the reference range.

  As described above, the frictional force between the guide member 30 and the valve body 40 is adjusted to be within the reference range by changing the number of the elastic members 50, so that the vibration of the valve body 40 is suppressed, and The valve element 40 can smoothly open and close. In addition, the frictional force between the guide member 30 and the valve body 40 can be adjusted afterwards by changing the number of the elastic members 50 when the valve device 1 is maintained. Therefore, the frictional force between the guide member 30 and the valve body 40 can be easily adjusted to an appropriate value.

(Modification 2)
In each of the above embodiments, the valve guides 42 and 94 are closer to the valve 41 (valve member 91) than the recesses 45 and 95A, and the valve guides 42 and 94 are closer to the valve 41 (valve member 91) than the recesses 45 and 95A. You may provide the recessed part or groove | channel for hold | maintaining lubricant, such as grease, in at least one of the part on the opposite side to the side. It is possible to adjust the frictional force between the valve bodies 40 and 90 and the guide members 30 and 70 to be within the reference range by adjusting the type and amount of lubricant filled in the recess or groove. it can.
In addition, this recessed part or groove | channel may be the same shape as the recessed parts 45 and 95A. In this case, in the first modification, when the number of the concave portions 45 and 95A is larger than the number of the elastic members 50, the concave portions 45 and 95A to which the elastic members 50 are not attached may be filled with a lubricant.

(Modification 3)
In each said embodiment, although the O-ring was used as the elastic member 50, the kind of elastic member 50 is not limited to this. For example, as shown in FIG. 13, MY packing may be used as the elastic member 100. In FIG. 13, the elastic member 100 is attached to the valve body 40. The elastic member 100 may be attached to the valve body 90.
As shown in FIG. 13, the cross-sectional shape of the elastic member 100 is different from the cross-sectional shape of the elastic member 50 of each of the above embodiments. In this way, by changing the type (cross-sectional shape) of the elastic member 100, the protrusion amount PL (see FIG. 3) of the elastic member 50 with respect to the opening 45B of the recess 45 is adjusted. In general, the friction force between the valve body 40 to which the MY packing is attached and the guide member 30 is smaller than the friction force between the valve body 40 to which the same size O-ring is attached and the guide member 30. . The elastic member may have a cross-sectional shape other than the cross-sectional shape of the O-ring or MY packing.

  According to this configuration, the frictional force between the guide member 30 and the valve body 40 is adjusted within the reference range by changing the type (cross-sectional shape) of the elastic member 50. For this reason, it is possible to achieve both suppression of vibration of the valve body 40 and smooth opening / closing operation of the valve body 40. In addition, the frictional force between the guide member 30 and the valve body 40 can be adjusted afterwards by replacing the elastic member 50 during maintenance of the valve device 1 or the like. Therefore, the frictional force between the guide member 30 and the valve body 40 can be easily adjusted to an appropriate value. Moreover, since MY packing which is standardized and has a large amount of circulation is used, the same effect as the effect (1) of the first embodiment can be obtained.

(Modification 4)
In the above embodiments, the material of the O-ring as the elastic member 50 may be changed. Thereby, the frictional force between the valve body 40 and the guide member 30 is changed. For this reason, the material of the elastic member 50 may be changed to a material in which the frictional force between the valve body 40 and the guide member 30 is within the reference range. Note that the material of the elastic member 100 may be similarly changed for the elastic member 100.

  According to this configuration, the material of the elastic member 50 is changed so that the frictional force between the valve body 40 and the guide member 30 is adjusted to be within the reference range, so that vibration of the valve body 40 is suppressed. And the valve body 40 can be opened and closed smoothly. In addition, the frictional force between the guide member 30 and the valve body 40 can be adjusted afterwards by replacing the elastic member 50 during maintenance of the valve device 1 or the like. Therefore, the frictional force between the guide member 30 and the valve body 40 can be easily adjusted to an appropriate value.

(Modification 5)
In the said 1st-3rd embodiment, although the valve body 40 was formed with the valve 41 and the valve guide 42 by the single member, the structure of the valve body 40 is not restricted to this. For example, as shown in FIG. 14, the valve body 110 has a configuration in which the valve member 111 and the valve guide 113 are integrated by fixing the individually formed valve member 111 and the valve guide 113 to each other. There may be. Specifically, a cylindrical screw portion 112 extending in the opening / closing direction of the valve body 110 is formed at the center of the valve member 111. In the cylindrical valve guide 113, a threaded portion 114 is formed on the inner peripheral portion on the valve member 111 side. Further, the valve body 110 is connected through the threaded portion 114 of the valve guide 113 and the threaded portion 112 of the valve member 111 in the radial direction so as to communicate the internal space SC of the valve guide 113 and the outside of the valve guide 113. A hole 115 is formed. The valve member 111 and the valve guide 113 having such a configuration are fixed to each other when the threaded portion 114 of the valve guide 113 and the threaded portion 112 of the valve member 111 are screwed together. Thereby, the effect according to the effect of (4) of 1st Embodiment can be acquired. In addition, the fixing method of the valve member 111 and the valve guide 113 is not restricted to the said screwing, Other methods, such as welding, adhesion | attachment, and press injection, may be sufficient.

(Modification 6)
In each of the above embodiments, the elastic member 50 is attached to the valve bodies 40, 90. However, a recess may be formed in the guide members 30, 70, and the elastic member 50 may be attached to the recess. According to this configuration, a frictional force can be applied between the guide members 30 and 70 and the valve bodies 40 and 90 as in the above embodiments.

(Modification 7)
In the first and second embodiments, a cushion may be provided on the valve seat 14 instead of or in addition to the cushion 46. As a result, direct contact between the valve 41 and the valve seat 14 can be avoided. Therefore, when the valve body 40 contacts the valve seat 14 during the valve closing operation, the impact applied to the valve body 40 is reduced. The In the third embodiment, a cushion may be provided on the valve seat 14 in addition to the cushion 49.
In the fourth embodiment, the valve seat 14 may be provided with a cushion. In this case, the valve member 91 may include a cushion 93, or may be configured as a metal disk instead of the cushion 93 and the core material 92.

(Modification 8)
In each of the above embodiments, the plug 21 and the guide members 30 and 70 are individually formed. However, the cylindrical portion 22 of the plug 21 may also function as the guide members 30 and 70. In this case, the cylindrical portion 22 of the plug 21 corresponds to a guide portion, and the guide members 30 and 70 are omitted.

(Modification 9)
In each said embodiment, the valve guides 42 and 94 of the valve bodies 40 and 90 may be formed in a column shape. That is, the internal space SA may be omitted from the valve guides 42 and 94. In such a configuration, the urging member 60 presses the end of the valve guides 42 and 94 opposite to the valve 41 and the valve member 91 toward the valve seat 14.

(Modification 10)
In the above embodiments, the valve bodies 40 and 90 are flat valves, but the valve bodies 40 and 90 may be poppet valves.

(Modification 11)
In the said 1st and 2nd embodiment, you may change the cushion 46 of the valve body 40 into the cushion 46 which has the protrusion part 46B like the valve body 40 of 5th Embodiment. Similarly, in the third embodiment, the protrusion 46 </ b> B may be provided on the cushion 46 of the valve body 40. Similarly, in the fourth embodiment, the protrusion 46 </ b> B may be provided on the cushion 93 of the valve body 90.

(Modification 12)
In each said embodiment, although the valve apparatus 1 was applied to the non-return valve, the structure of the valve apparatus 1 is not restricted to this, The valve apparatus 1 may be applied to a differential pressure valve.

DESCRIPTION OF SYMBOLS 1: Valve apparatus 10: Main-body part 11: Internal channel | path 14: Valve seat 30: Guide member (guide part)
40: Valve body 41: Valve 42: Valve guide 44: Communication hole (valve side communication hole)
45: Concave portion (friction force applying means)
45A: Opening 46: Cushion 50: Elastic member (friction force applying means)
60: Biasing member 70: Guide member (guide portion)
73: Extension part 74: Communication hole (guide side communication hole)
49: Cushion 90: Valve body 91: Valve member (valve)
93: Cushion 94: Valve guide 95A: Concave portion (friction force applying means)
96A: Communication hole 98: Cushion spacer 100: Elastic member 110: Valve body 111: Valve member (valve)
113: Valve guide 116: Communication hole SA: Internal space SB: Internal space SC: Internal space PL: Protrusion amount LH: Depth dimension

Claims (16)

A main body formed with an internal passage through which fluid passes;
A valve body housed in the main body, closing the internal passage by contacting a valve seat provided in the main body, and opening the internal passage by separating from the valve seat;
An urging member for urging the valve body toward the valve seat;
A valve device comprising: a guide portion that guides the valve body in an opening and closing direction of the valve body,
The valve body includes a valve guide guided by the guide portion,
The valve guide is provided with an internal space into which the biasing member is inserted,
The valve device further includes a frictional force applying unit that applies a frictional force between the valve body and the guide portion. The valve body closes the internal passage by contacting the valve seat, and opens the internal passage by being separated from the valve seat, and is guided by the guide portion when the valve body is opened and closed. The valve device according to claim 1, wherein the valve guide is integrated so that relative movement is impossible. The guide portion includes an extension portion that extends toward the valve seat,
The valve device according to claim 1, wherein the extension portion and the valve body have a clearance fitting relationship. The valve guide is formed in a cylindrical shape including the internal space,
The valve device according to any one of claims 1 to 3, wherein the valve guide is formed with a valve side communication hole that communicates the outside of the valve guide and the internal space in a radial direction. The valve device according to claim 4, wherein a guide side communication hole that communicates with the valve side communication hole is formed in the extension portion. The valve device according to claim 4, wherein the outside of the guide portion and the valve side communication hole communicate with each other only through a gap between the valve body and the extension portion. A main body formed with an internal passage through which fluid passes;
A valve body housed in the main body, closing the internal passage by contacting a valve seat provided in the main body, and opening the internal passage by separating from the valve seat;
An urging member for urging the valve body toward the valve seat;
A valve device comprising: a guide portion that guides the valve body in an opening and closing direction of the valve body,
The valve body includes a valve guide guided by the guide portion,
The guide portion supports both the valve guide and the portion of the valve body facing the valve seat in a direction orthogonal to the opening / closing direction of the valve body,
The valve device further includes a frictional force applying unit that applies a frictional force between the valve body and the guide portion. The frictional force applying means is disposed in one of a portion of the valve body that faces the guide portion and a portion of the guide portion that faces the valve body, and is disposed in the recess, An elastic member in contact with
The valve according to any one of claims 1 to 7, wherein the depth dimension of the concave portion is a value such that the frictional force generated when the elastic member contacts the guide portion is within a predetermined range. apparatus. The frictional force applying means includes a recess formed in one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body, and an elastic member disposed in the recess. With
The valve device according to any one of claims 1 to 7, wherein the elastic member has a cross-sectional shape such that the frictional force is within a predetermined range. The frictional force applying means includes a plurality of recesses formed in one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body, and at least one of the plurality of recesses An elastic member disposed in the recess,
The valve device according to any one of claims 1 to 7, wherein the number of the elastic members is a number such that the frictional force is within a predetermined range. The frictional force applying means includes a recess formed in one of a portion of the valve body facing the guide portion and a portion of the guide portion facing the valve body, and an elastic member disposed in the recess. With
The valve device according to any one of claims 1 to 7, wherein the elastic member is made of a material that allows the frictional force to be within a predetermined range. The valve device according to any one of claims 8 to 11, wherein the elastic member is an O-ring or an MY packing. The valve according to any one of claims 1 to 12, wherein a cushion is provided on one of a portion facing the valve seat in the valve body and a portion facing the valve body in the valve seat. apparatus. The valve device according to claim 13, wherein the cushion is provided only in a portion of the valve body that faces the valve seat. The valve device according to claim 14, wherein the cushion is detachably attached to the valve body. The valve body closes the internal passage by contacting the valve seat, and opens the internal passage by being separated from the valve seat, and is guided by the guide portion when the valve body is opened and closed. The valve guide is configured separately, and the valve guide and the valve operate integrally.
In the opening and closing direction of the valve body, a gap is formed between the valve body and the valve guide,
The valve device according to claim 1 or 7, wherein a cushion spacer is disposed in the gap.

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