JP2006139451A - Pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve capable of surely suppressing vibration occurring in a flapper due to a pressure fluid and the displacement of the flapper due to the vibration when the pressure fluid passes through a nozzle from a nozzle back pressure chamber to a diaphragm chamber. <P>SOLUTION: In the pressure reducing valve 10, a sphere 13 is supported in a point contact status by a pressure receiving member 94 arranged at a top end part 102 of a pressurizing member 78, and the side part of the sphere 13 is supported in a face contact status by a sphere supporting mechanism 90, and a first expanding part 100 of the sphere supporting mechanism 90 is supported in the face contact status by a third holding member 92. The third holding member 92 is supported so as to be fit into a second expanding part 104 and the top end part 102 of the pressurizing member 78. Thus, the sphere 13 is surely supported, thereby surely suppressingthe vibration toccurring in the flapper 12 due to the pressure fluid or the displacement of the flapper 12 due to the vibration. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressure reducing valve for reducing the pressure fluid supplied from the primary side to a desired pressure and leading it to the secondary side, and more specifically, separating the flapper disposed in the diaphragm chamber from the nozzle. By reducing the pressure fluid to a desired pressure and leading to the secondary side by controlling the flow of the pressure fluid introduced into the diaphragm chamber from the primary side through the nozzle by the closing operation. Regarding the valve.

  Conventionally, when pressure fluid is supplied from a fluid pressure supply source to a fluid pressure device at a desired set pressure, a pressure reducing valve is interposed between the fluid pressure supply source and the fluid pressure device. The pressure reducing valve reduces the primary pressure fluid supplied from the fluid pressure supply source to a desired pressure corresponding to the fluid pressure device connected to the secondary side, and supplies the pressure to the secondary side. It is.

  FIG. 4 is a pressure reducing valve 200 according to the prior art devised by the present applicant (see Patent Document 1), and includes a nozzle 204 and a flapper 206 including a sphere 207 without applying the elastic force of the spring member 202. In the separated state, the pressure fluid supplied from the primary side port 208 is introduced into the nozzle back pressure chamber 210 through a first passage (not shown), passes through the gap between the nozzle 204 and the sphere 207, and is first. It is introduced into the diaphragm chamber 212. The pressure fluid introduced into the first diaphragm chamber 212 is released into the atmosphere via the bleed port 214.

  When the handle 216 is rotated in such a bleed state, the flapper 206 is pressed downward by the elastic force of the spring member 202, and the nozzle hole of the nozzle 204 is closed by the sphere 207 of the flapper 206. As a result, the pressure in the nozzle back pressure chamber 210 (nozzle back pressure) increases. Under the action of the nozzle back pressure, the first diaphragm 218, the second diaphragm 220, and the second diaphragm 220 are connected to each other via the holding member 222. The engaged valve body 224 is integrally displaced downward, and the valve body 224 is separated from the seating portion 226, whereby the primary side port 208 and the secondary side port 228 communicate with each other. As a result, the pressure fluid introduced from the primary side port 208 is depressurized under the pressure regulating action of the second diaphragm 220, and the depressurized pressure fluid is transferred to the fluid pressure device connected to the secondary side port 228. Supplied.

  When the pressure of the depressurized pressure fluid rises above a set pressure, the pressure fluid whose pressure has increased pushes the second diaphragm 220 upward, and at the same time the second diaphragm chamber 230 via a second passage (not shown). The third diaphragm 232 is pressed upward against the elastic force of the spring member 202. As a result, the flapper 206 is released from the pressed state by the spring member 202, and the sphere 207 of the flapper 206 is separated from the nozzle 204.

  As a result, the pressure fluid in the nozzle back pressure chamber 210 passes through the gap between the nozzle 204 and the sphere 207 via the nozzle hole and is released into the atmosphere via the bleed port 214. The nozzle back pressure in the chamber 210 is instantaneously reduced, and the first diaphragm 218 and the second diaphragm 220 are raised. As a result, the holding member 222 is separated from the head of the valve body 224, and the valve body 224 is displaced upward by the elastic force of the damper member 234 with respect to the valve body 224 and is seated on the seat portion 226. Accordingly, the through hole 236 of the holding member 222 that has been blocked by the head of the valve body 224 opens, and the pressure fluid in the secondary side port 228 passes through the exhaust port 238 from the through hole 236 to the atmosphere. Released into.

  In the pressure reducing valve 200 according to the related art described above, as easily understood from FIG. 4, the sphere 207 is held in the first diaphragm chamber 212 via a leaf spring member 240 constituting the flapper 206.

JP-A-10-198433

  The present invention is a further improvement of the pressure reducing valve according to the prior art described above, and vibration generated in the flapper by the pressure fluid when the pressure fluid flows from the nozzle back pressure chamber to the diaphragm chamber via the nozzle. Another object of the present invention is to provide a pressure reducing valve that can reliably suppress displacement of the flapper due to the vibration.

  The pressure reducing valve according to the present invention includes a nozzle back pressure chamber into which a pressure fluid is introduced, a diaphragm chamber communicating with the nozzle back pressure chamber via a nozzle, and a separation and closing operation with respect to the nozzle disposed in the diaphragm chamber. And a flapper for controlling the flow of the pressure fluid introduced from the nozzle back pressure chamber to the diaphragm chamber via the nozzle, and reducing the pressure fluid supplied from the primary side to a desired pressure. In the pressure reducing valve led out to the secondary side, the flapper includes a sphere that separates and closes the nozzle, and a sphere support mechanism that supports a side portion of the sphere with respect to the operation direction of the sphere. In addition, the nozzle is displaceable with respect to the nozzle by a flapper support mechanism that supports the sphere and the sphere support mechanism. A protrusion that surrounds the sphere and the sphere support mechanism and that faces the nozzle is formed, and the protrusion of the flapper support mechanism supports the sphere support mechanism in a surface contact state, while the tip portion is the sphere The spherical body is separated from the support mechanism and is supported in a point contact state.

  The flapper support mechanism supports the sphere in a point contact state, the sphere support mechanism supports a side portion of the sphere, and the protrusion of the flapper support mechanism supports the sphere support mechanism in a surface contact state. is doing.

  Accordingly, the sphere is reliably supported by the frictional force on the contact surface between the sphere support mechanism and the protrusion and the contact point between the flapper support mechanism and the sphere. As a result, when the sphere is separated and closed with respect to the nozzle, when the pressure fluid is introduced from the nozzle back pressure chamber into the diaphragm chamber via the nozzle, the pressure fluid causes the Vibration generated in the flapper is suppressed by the support of the sphere by the flapper support mechanism and the support of the sphere support mechanism by the protrusion, and is also suppressed by the frictional force on the contact surface between the sphere support mechanism and the protrusion. Is done. Therefore, the displacement of the flapper due to the vibration can be reliably suppressed.

  The sphere is preferably rotatable while being supported by the sphere support mechanism and the flapper support mechanism, and the sphere support mechanism is preferably movable in a direction perpendicular to the displacement direction of the flapper.

  Accordingly, when the sphere is in contact with the end of the nozzle in a state where the flapper and the nozzle are not coaxial, the sphere is rotated on the end and the shaft of the nozzle is moved together with the sphere support mechanism. The sphere closes the nozzle in a state where the sphere and the sphere support mechanism and the nozzle are coaxial. Therefore, the sphere support mechanism and the sphere can be easily aligned with respect to the nozzle, and the sphere can be separated and closed with respect to the nozzle accurately.

  Further, since the sphere is rotatable, the contact surface of the pressure fluid in the sphere can be appropriately changed, and the life of the sphere can be extended.

  Furthermore, it is preferable that the contact surface with the sphere in the sphere support mechanism has a taper that decreases in diameter toward the nozzle.

  Thus, when the sphere closes the nozzle, the sphere rotates along the taper, so that the sphere support mechanism and the sphere can be easily aligned with the nozzle, and the sphere with respect to the nozzle can be easily aligned. The separation and closing operation can be performed more accurately. Further, by supporting the sphere through the taper, it is possible to prevent the sphere from jumping out of the sphere support mechanism to the nozzle side.

  Furthermore, a pressure receiving member having the same hardness as the sphere or higher hardness than the sphere is disposed at a portion of the tip of the flapper support mechanism that supports the sphere in a point contact state. preferable. Thus, when the pressure fluid comes into contact with the sphere, it is possible to prevent wear at the tip portion of the flapper support mechanism due to a pressing force against the sphere from the pressure fluid.

  Furthermore, it is preferable that an elastic member is interposed between the projecting portion and the wall portion on the nozzle side forming the diaphragm chamber along the operation direction of the sphere. Accordingly, when the sphere and the sphere support mechanism are advanced and retracted in the operation direction by the flapper support mechanism, the sphere can be separated and closed with respect to the nozzle by the elastic force of the elastic member. It becomes.

  According to the pressure reducing valve of the present invention, the flapper support mechanism supports the sphere in a point contact state, the sphere support mechanism supports the side of the sphere, and the protrusion of the flapper support mechanism supports the sphere support mechanism. Supports in surface contact.

  As a result, the sphere is reliably supported by the frictional force on the contact surface between the sphere support mechanism and the protrusion and the contact point between the flapper support mechanism and the sphere. As a result, when the pressure fluid is introduced from the nozzle back pressure chamber into the diaphragm chamber via the nozzle when the sphere is separated and closed with respect to the nozzle, the pressure fluid generates the flapper. The vibration to be suppressed is suppressed by the support of the sphere by the flapper support mechanism and the support of the sphere support mechanism by the protrusion, and is also suppressed by the frictional force on the contact surface between the sphere support mechanism and the protrusion. Therefore, the displacement of the flapper due to the vibration can be reliably suppressed.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a pressure reducing valve according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing a pressure reducing valve 10 according to an embodiment of the present invention (hereinafter referred to as pressure reducing valve 10 according to the present embodiment), and FIG. 2 shows a sphere 13 constituting a flapper 12. FIG. 3 is an enlarged longitudinal sectional view of the periphery of a diaphragm chamber (first diaphragm chamber) 16 showing a state where the nozzle 13 is separated from the nozzle 14, and FIG. 3 shows the first diaphragm showing a state where the sphere 13 closes the nozzle 14. FIG. 3 is an enlarged longitudinal sectional view around a chamber 16.

  As shown in FIG. 1, the pressure reducing valve 10 according to the present embodiment basically includes a body portion 18, a cover portion 20 that is airtightly connected to a lower portion of the body portion 18, and an upper portion of the body portion 18. The bonnet part 22 is integrally connected to the bonnet part 22, and the operation part 24 is provided on the bonnet part 22 so as to be rotatable.

  The cover portion 20 includes a closing member 28 that hermetically closes a hole formed in the lower portion of the body portion 18 via an O-ring 26, and a valve that is fitted and supported in a hole formed in the upper portion of the closing member 28. A body 30, a damper member 34 fitted and supported in a groove 32 formed in the upper part of the closing member 28, and externally fitted to the valve body 30, and an outer fit to the valve body 30 above the damper member 34. A washer 36 and an elastic seal 38 that is externally fitted to the valve body 30 above the washer 36. Here, the said valve body 30 can be displaced along an up-down direction (arrow A1 direction and A2 direction) with the elastic force of the said damper member 34 comprised with the rubber material.

  The body portion 18 includes a first body 40 that engages with the cover portion 20, a second body 42 that is disposed above the first body 40, and a third body 44 that is disposed above the second body 42. The first body 40, the second body 42, and the third body 44 are integrally assembled by screws (not shown). The second body 42 is formed with an exhaust port 46, and the third body 44 is formed with a bleed port 48 that communicates the first diaphragm chamber 16 with the outside.

  A primary side port 50 connected to a fluid pressure supply source (not shown) and a secondary side port 52 connected to a fluid pressure device (not shown) are spaced apart from each other on opposite side surfaces of the first body 40 by a predetermined distance. A communication passage 54 is formed between the primary side port 50 and the secondary side port 52 so as to communicate the primary side port 50 and the secondary side port 52.

  Here, when the valve body 30 is seated via the seal 38 on the seating portion 56 as the wall portion on the arrow A1 direction side that forms the communication passage 54, the communication between the primary side port 50 and the secondary side port 52 is established. The state is interrupted. On the other hand, when the valve body 30 is separated downward (in the direction of arrow A2) from the seating portion 56 via the seal 38, the primary side port 50 and the secondary side port 52 are in communication with each other.

  A first diaphragm 62 is interposed between the first body 40 and the second body 42 via a first spring member 58 and a first holding member 60. Further, a second diaphragm 64 is interposed between the second body 42 and the third body 44 via a second holding member 63.

  A second diaphragm chamber 66 that communicates with the secondary port 52 is provided below the first diaphragm 62, and a first diaphragm 62 that communicates with the exhaust port 46 is provided between the first diaphragm 62 and the second diaphragm 64. A three diaphragm chamber 68 is provided. In addition, the first holding member 60 that engages with the head of the valve body 30 is provided at the center of the first diaphragm 62. The first holding member 60 includes the second diaphragm chamber 66 and the first diaphragm 62. A through hole 70 for communicating with the three diaphragm chambers 68 is formed. Further, the second diaphragm chamber 66 is provided with the first spring member 58 described above, and the first diaphragm 62 is moved upward via the first holding member 60 by the elastic force of the first spring member 58. Pressed. Furthermore, a stopper portion 72 that restricts the displacement of the first holding member 60 is formed on the inner side of the first spring member 58 so as to protrude from the upper surface of the seating portion 56 in the direction of the arrow A1.

  Between the 3rd body 44 and the bonnet part 22, the 3rd diaphragm 80 and the 4th diaphragm 82 clamped by the diaphragm pressing member 74, the disc member 76, and the press member 78 by predetermined spacing are arrange | positioned. ing. In this case, a second spring member 84 is disposed on the upper surface of the disk member 76, and the third diaphragm 80 and the fourth diaphragm 82 are lowered (in the direction of arrow A2) by the elastic force of the second spring member 84. Is pressed toward.

  A nozzle back pressure chamber 86 is provided between the second body 42 and the third body 44 by the second diaphragm 64 and the third body 44. A single diaphragm chamber 16 is provided. A nozzle 14 having a nozzle hole 88 formed therein is disposed below the first diaphragm chamber 16, and a hole formed in the lower portion of the third body 44 and the nozzle hole 88 communicating with the hole are provided. The nozzle back pressure chamber 86 and the first diaphragm chamber 16 communicate with each other.

  Further, as shown in FIGS. 1 to 3, a flapper 12 and a flapper support mechanism 96 are respectively provided above the nozzles 14 in the first diaphragm chamber 16. The flapper 12 includes a sphere 13 and a sphere support mechanism 90 that supports a side portion of the sphere 13 in a direction perpendicular to the vertical direction (arrow A1 direction and arrow A2 direction). On the other hand, the flapper support mechanism 96 includes a pressing member 78, a third holding member 92, and a pressure receiving member 94, and supports the sphere support mechanism 90 and the sphere 13. The pressing member 78 has a large recess at its lower end, the third holding member 92 is accommodated and fixed in the recess, and the pressure receiving member 94 is embedded so as to face the recess. The pressure receiving member 94 and the sphere 13 are in point contact.

  The sphere support mechanism 90 made of a metal material such as brass or aluminum has a first bulging portion 100 that protrudes annularly outward from the side portion. Here, the third holding member 92 made of a metal material is fitted into the pressing member 78, and the first bulging portion 100 faces between the edge of the third holding member 92 protruding inward. Supported in contact. The sphere support mechanism 90 configured as described above surrounds the side portion of the sphere 13, and the contact surface of the sphere support mechanism 90 with the sphere 13 is directed in the direction toward the nozzle 14 (arrow A2 direction). The taper 98 is reduced in diameter. In this case, the sphere support mechanism 90 supports the sphere 13 in a surface contact state by the taper 98 and prevents the sphere 13 from dropping in the direction of the nozzle 14 (arrow A2 direction).

  The pressing member 78 has a second bulging portion 104 bulging from the tip portion 102 in the direction of the arrow A2, and the third holding member 92 includes the second bulging portion 104 and the tip. The portion 102 is fitted and supported. In the flapper support mechanism 96, the third holding member 92 and the second bulging portion 104 constitute a protruding portion 106 that surrounds the sphere 13 and the sphere support mechanism 90.

  The pressure receiving member 94 is made of a material (for example, steel) having the same hardness as the sphere 13 made of a steel ball or higher hardness than the sphere 13, while the sphere support mechanism 90 and the distal end portion 102 of the pressing member 78. Are separated from each other. In this case, the width of the space formed by the tip portion 102 and the third holding member 92 is larger than the width of the first bulging portion 100. Therefore, the sphere support mechanism 90 is movable in the direction orthogonal to the arrow A1 direction and the arrow A2 direction along the third holding member 92 in a state where the sphere 13 is supported in surface contact by the taper 98.

  A third spring member (elastic member) 110 is interposed between the tip of the second bulging portion 104 and the wall portion 108 of the third body 44 that forms the first diaphragm chamber 16. In this case, when the sphere 13 is supported by the sphere support mechanism 90 and the flapper support mechanism 96, when the pressing member 78 is moved downward (in the direction of arrow A2) by the elastic force of the second spring member 84, the sphere 13 is The nozzle hole 88 is closed by moving toward the nozzle 14. On the other hand, when the pressing state of the pressing member 78 by the second spring member 84 is released, the spherical body support mechanism 90 and the flapper support mechanism 96 are moved in the direction of arrow A1 by the upward elastic force of the third spring member 110. The sphere 13 is separated from the nozzle 14.

  A nozzle back pressure chamber 86 shown in FIG. 1 communicates with the primary port 50 via a first passage (not shown), while a fourth diaphragm chamber 112 formed between the third diaphragm 80 and the fourth diaphragm 82. Is in communication with the secondary port 52 via a second passage (not shown).

  The operation unit 24 includes a handle 114 that is rotatably provided on the upper portion of the bonnet portion 22, a lock nut 116 that fixes the handle 114, a nut 118 that holds a bracket (not shown), and a washer 120. A receiving member 122 that engages with the second spring member 84 and presses the second spring member 84 in the arrow A2 direction side is provided at one end of the handle 114.

  The pressure reducing valve 10 according to the present embodiment is basically configured as described above. Next, the operation of the pressure reducing valve 10 will be described with reference to FIGS.

  First, a pressure fluid supply source (not shown) is connected to the primary port 50 via a tube or the like (not shown), while a desired fluid pressure device such as a cylinder is connected to the secondary port 52.

  After completing such preparatory work, a state is set in which a gap is formed between the nozzle 14 and the sphere 13 constituting the flapper 12 without rotating the handle 114. That is, the elastic force of the third spring member 110 is not applied while the elastic force of the second spring member 84 is not applied, so that the nozzle 14 and the sphere 13 are separated from each other by a predetermined distance (see FIG. 2). ). In this case, the pressure fluid supplied from the primary port 50 is introduced into the nozzle back pressure chamber 86 through the first passage, passes through the gap between the nozzle 14 and the sphere 13, and then enters the first diaphragm chamber 16. To be introduced. The pressure fluid introduced into the first diaphragm chamber 16 is discharged from the bleed port 48 into the atmosphere.

  In such a bleed state, when the handle 114 is rotated in a predetermined direction and the pressing member 78 is pressed downward (arrow A2 direction side) via the disk member 76 by the elastic force of the second spring member 84. Then, the sphere 13 supported by the sphere support mechanism 90 and the flapper support mechanism 96 advances in the direction of the arrow A2, and closes the nozzle 14 (nozzle hole 88) (see FIG. 3).

  Here, when the sphere 13 and the nozzle 14 are not coaxial in a state where the sphere 13 and the nozzle 14 are spaced apart from each other (see FIG. 2), when the sphere 13 advances in the direction of the arrow A2, the sphere 13 The spherical body 13 moves on the upper end portion in the direction of the central axis of the nozzle 14 while rotating along the taper 98. In this case, since a clearance exists in the direction orthogonal to the arrow A2 direction between the spherical body support mechanism 90 including the first bulge portion 100 and the third holding member 92, the spherical body support mechanism 90 is Along with the contact surface between the third holding member 92 and the first bulging portion 100, it can move together with the sphere 13 within the clearance. In a state where the sphere 13 and the nozzle 14 are coaxial, the sphere 13 closes the nozzle hole 88.

  As a result, the pressure in the nozzle back pressure chamber 86 (nozzle back pressure) increases, and the second diaphragm 64 is pressed in the direction of the arrow A2 under the action of the nozzle back pressure, and the second diaphragm 64 and the first diaphragm 62 are pressed. Then, the valve body 30 is integrally displaced in the direction of the arrow A2, and the valve body 30 is separated from the seating portion 56.

  Thereby, the communication path 54 is opened, and the primary side port 50 and the secondary side port 52 communicate with each other. Therefore, in the second diaphragm chamber 66, the pressure fluid introduced through the communication passage 54 is reduced to a desired pressure under the pressure regulating action of the first diaphragm 62, and the reduced pressure fluid is supplied to the second diaphragm chamber 66. The fluid pressure device connected to the secondary port 52 can be stably supplied.

  On the other hand, when the pressure fluid pressure at the secondary side port 52 rises above the set pressure, the pressure fluid whose pressure has risen presses the first diaphragm 62 upward (in the direction of the arrow A1) and passes through the second passage. And introduced into the fourth diaphragm chamber 112 to press the fourth diaphragm 82 in the direction of the arrow A1 against the elastic force of the second spring member 84. As a result, the disk member 76 is displaced in the arrow A1 direction, and the pressing member 78 is displaced in the arrow A1 direction by the displacement of the disk member 76 in the arrow A1 direction and the elastic force of the third spring member 110.

  At that time, since the sphere 13 supported by the sphere support mechanism 90 and the flapper support mechanism 96 is also displaced in the direction of the arrow A1, the sphere 13 constituting the flapper 12 is separated from the nozzle 14 (see FIG. 2). As a result, the pressure fluid in the nozzle back pressure chamber 86 passes through the gap between the nozzle 14 and the sphere 13 and is released into the atmosphere via the bleed port 48. As a result, the nozzle back pressure in the nozzle back pressure chamber 86 is instantaneously reduced.

  When the nozzle back pressure is instantaneously reduced, the first diaphragm 62 and the second diaphragm 64 are raised in the direction of the arrow A1, and the head of the valve body 30 is separated from the first holding member 60. The valve body 30 is displaced in the direction of the arrow A1 by the elastic force of the damper member 34 and is seated on the seating portion 56. Accordingly, the through fluid 70 whose first holding member 60 has been closed by the head of the valve body 30 is opened, and the pressure fluid whose pressure has increased in the secondary side port 52 passes through the through hole 70. The gas is introduced into the three diaphragm chamber 68 and finally discharged from the exhaust port 46 into the atmosphere.

  Thus, in the pressure reducing valve 10 according to the present embodiment, the distal end portion 102 of the pressing member 78 constituting the flapper support mechanism 96 supports the sphere 13 constituting the flapper 12 in a point contact state, and the flapper 12 is supported. The sphere support mechanism 90 constituting the sphere 13 supports the side portion of the sphere 13 by surface contact, and the third holding member 92 constituting the protruding portion 106 of the flapper support mechanism 96 is the first bulging portion 100 of the sphere support mechanism 90. Are supported in surface contact.

  Accordingly, the sphere 13 is reliably supported by the frictional force on the contact surface between the first bulging portion 100 and the third holding member 92 and the contact point between the tip portion 102 and the sphere 13. As a result, when pressure fluid is introduced from the nozzle back pressure chamber 86 to the first diaphragm chamber 16 via the nozzle 14 when the sphere 13 is separated and closed with respect to the nozzle 14, The vibration generated in the flapper 12 by the fluid is suppressed by the support of the sphere 13 by the tip 102 and the support of the first bulge 100 by the third holding member 92, and the first bulge 100. And the third holding member 92 are suppressed by the frictional force on the contact surface. Therefore, the displacement of the flapper 12 due to the vibration can be reliably suppressed.

  Further, by making the sphere 13 rotatable while being supported by the sphere support mechanism 90 and the flapper support mechanism 96, the sphere 13 is positioned at the upper end of the nozzle 14 in a state where the flapper 12 and the nozzle 14 are not coaxial. When abutting, the sphere 13 moves in the central axis direction of the nozzle 14 together with the sphere support mechanism 90 while rotating on the upper end, and the sphere 13, the sphere support mechanism 90, and the nozzle 14 are moved. The sphere 13 closes the nozzle 14 in a coaxial state. Therefore, the spherical support mechanism 90 and the spherical body 13 can be easily aligned with the nozzle 14, and the separation and closing operation of the spherical body 13 with respect to the nozzle 14 can be performed accurately. Further, since the sphere 13 is rotatable, the contact surface of the sphere 13 with the pressure fluid can be appropriately changed, and the life of the sphere 13 can be extended.

  Further, if the flapper 12 includes the sphere 13 and the contact surface of the sphere support mechanism 90 with the sphere 13 is a taper 98 that decreases in diameter toward the nozzle 14, the sphere 13 closes the nozzle 14. At this time, since the sphere 13 rotates along the taper 98, the sphere support mechanism 90 and the sphere 13 can be more easily aligned with the nozzle 14, and the sphere 13 is separated and closed with respect to the nozzle 14. Can be performed more accurately. Further, by supporting the sphere 13 via the taper 98, it is possible to prevent the sphere 13 from jumping out from the sphere support mechanism 90 to the nozzle 14 side.

  Furthermore, since the spherical body 13 is supported in a point contact state by the pressure receiving member 94 having the same hardness as the spherical body 13 or higher hardness than the spherical body 13, the pressure fluid contacts the spherical body 13. In addition, it is possible to prevent wear at the tip portion 102 of the pressing member 78 due to the pressing force against the sphere 13 from the pressure fluid.

  Furthermore, the third spring member 110 is inserted by inserting a third spring member 110 between the second bulging portion 104 constituting the protruding portion 106 and the wall portion 108 forming the first diaphragm chamber 16. It becomes possible to more reliably perform the separation and closing operation of the sphere 13 with respect to the nozzle 14 by the elastic force of.

  In addition, the pressure reducing valve according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

It is a longitudinal cross-sectional view of the pressure reducing valve which concerns on this embodiment. FIG. 2 is a longitudinal sectional view of an essential part showing a state in which a sphere constituting a flapper is separated from a nozzle in the pressure reducing valve of FIG. 1. FIG. 2 is a longitudinal sectional view of an essential part showing a state where a sphere constituting a flapper closes a nozzle in the pressure reducing valve of FIG. 1. It is sectional drawing of the pressure-reduction valve which concerns on the prior art which the present applicant devised.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pressure reducing valve 12 ... Flapper 13 ... Sphere 14 ... Nozzle 16, 66, 68, 112 ... Diaphragm chamber 18 ... Body part 20 ... Cover part 22 ... Bonnet part 24 ... Operation part 28 ... Closure member 30 ... Valve body 34 ... Damper Member 40, 42, 44 ... Body 46 ... Exhaust port 48 ... Bleed port 50 ... Primary side port 52 ... Secondary side port 54 ... Communication path 56 ... Seating part 58, 84, 110 ... Spring member 60, 63, 92 ... Holding Members 62, 64, 80, 82 ... Diaphragm 74 ... Diaphragm pressing member 76 ... Disc member 78 ... Pressing member 86 ... Nozzle back pressure chamber 88 ... Nozzle hole 90 ... Spherical body support mechanism 94 ... Pressure receiving member 96 ... Flapper support mechanism 98 ... Taper DESCRIPTION OF SYMBOLS 100,104 ... Protruding part 102 ... Tip part 106 ... Protruding part 108 ... Wall part 114 ... Handle 122 ... Receiving member

Claims (5)

A nozzle back pressure chamber into which pressure fluid is introduced;
A diaphragm chamber communicating with the nozzle back pressure chamber via a nozzle;
A flapper which is disposed in the diaphragm chamber and controls the flow of pressure fluid introduced from the nozzle back pressure chamber into the diaphragm chamber via the nozzle by separation and closing operation with respect to the nozzle;
With
In the pressure reducing valve for reducing the pressure fluid supplied from the primary side to a desired pressure and leading it to the secondary side,
The flapper includes a sphere that separates and closes the nozzle, and a sphere support mechanism that supports a side portion of the sphere with respect to the operation direction of the sphere, and includes the sphere and the sphere support mechanism. Displaceable with respect to the nozzle by a supporting flapper support mechanism,
A projecting portion surrounding the sphere and the sphere support mechanism and facing the nozzle is formed at the tip of the flapper support mechanism.
The protrusion of the flapper support mechanism supports the sphere support mechanism in a surface contact state, while the tip portion is separated from the sphere support mechanism and supports the sphere in a point contact state. Pressure reducing valve. The pressure reducing valve according to claim 1,
The sphere is rotatable while being supported by the sphere support mechanism and the flapper support mechanism,
The pressure reducing valve, wherein the spherical body support mechanism is movable in a direction orthogonal to a displacement direction of the flapper. The pressure reducing valve according to claim 1 or 2,
The pressure reducing valve characterized in that a contact surface with the sphere in the sphere support mechanism is tapered toward the nozzle. The pressure reducing valve according to any one of claims 1 to 3,
A pressure receiving member having the same hardness as the sphere or a higher hardness than the sphere is disposed at a portion of the tip of the flapper support mechanism that supports the sphere in a point contact state. Pressure reducing valve. The pressure reducing valve according to any one of claims 1 to 4,
An elastic member is interposed between the protruding portion and the wall portion on the nozzle side forming the diaphragm chamber along the operation direction of the spherical body.

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