Reducing valve and valve device

Abstract

A pressure reducing valve is provided with: a housing in which a valve passage is formed; a valve body which is accommodated in the housing so as to be capable of moving in the axial direction and which adjusts the opening degree of the valve passage according to the secondary pressure; and a biasing member housed in the housing and biasing the valve body in one axial direction against a secondary pressure, the biasing member being a plate-shaped spring extending radially outward from the valve body and being compressed and deformed in the axial direction at least when the secondary pressure is equal to atmospheric pressure.

Description

Technical Field

[0001] The present disclosure relates to a pressure reducing valve for adjusting the opening degree of a valve passage, and a valve device. Background Art

[0002] As a pressure reducing valve related to compressed natural gas, hydrogen and other gases, for example, there is a known pressure reducing valve such as that disclosed in Patent Document 1. In the pressure reducing valve disclosed in Patent Document 1, the secondary pressure acts on the valve body in the closing direction. In addition, a leaf spring is provided on the valve body. The leaf spring applies force to the valve body in the form of resisting the secondary pressure.

[0003] Prior art literature: Patent Literature: Patent document 1: Japanese Patent Application Publication No. 2021-124130. Summary of the invention

[0004] Problems to be solved by the invention: In the pressure reducing valve of Patent Document 1, the outer edge of the leaf spring is fixed by the housing. Therefore, when the valve body reciprocates, a large load amplitude is generated near the outer edge. Therefore, in the pressure reducing valve, it is expected to improve the durability of the leaf spring as a force applying member by taking measures to reduce the load amplitude.

[0005] An object of the present disclosure is to provide a pressure reducing valve and a valve device capable of improving the durability of a biasing member.

[0006] Means of solving the problem: The first disclosed pressure reducing valve comprises: a housing in which a valve passage is formed; a valve body which is movably accommodated in the housing in the axial direction and adjusts the opening of the valve passage according to a secondary pressure; and a biasing member which is accommodated in the housing and biases the valve body in an axial direction against the secondary pressure, wherein the biasing member is a plate-shaped spring which extends radially outward from the valve body and is compressed and deformed in the axial direction at least when the secondary pressure is equal to the atmospheric pressure.

[0007] According to the first disclosure, the force member is compressed and deformed in the axial direction. That is, an initial load can be applied to the force member in the axial direction before the valve body works. Therefore, when the valve body reciprocates, the change in the load acting on the force member can be suppressed. That is, the load amplitude generated on the force member can be reduced. As a result, the durability of the force member can be improved.

[0008] The second disclosed valve device comprises: a shell forming a valve passage; a valve body accommodated in the shell so as to be movably in the axial direction, and changing the opening of the valve passage by changing its position according to the acting force; and a biasing member accommodated in the shell, resisting the acting force and biasing the valve body in one axial direction to open the valve passage, the biasing member being a plate-shaped spring extending laterally from the valve body and being compressed and deformed in the axial direction by the shell.

[0009] According to the second disclosure, the force member is compressed and deformed in the axial direction by the housing. That is, an initial load can be applied to the force member in the axial direction before the valve body works. Therefore, when the valve body reciprocates, the change in the load of the force member can be suppressed. That is, the load amplitude generated on the force member can be reduced. As a result, the durability of the force member can be improved.

[0010] Effect of the invention: According to the present disclosure, the durability of the urging member can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A cross-sectional view showing a pressure reducing valve according to an embodiment of the present disclosure; Figure 2 To show Figure 1 A cross-sectional view of a leaf spring provided with a pressure reducing valve; Figure 3 For the general Figure 1 An enlarged cross-sectional view showing a portion of area X in the pressure reducing valve of FIG. Figure 4 For the general Figure 1 An enlarged cross-sectional view showing a portion of area Y in the pressure reducing valve of FIG. Figure 5 To show Figure 1 A cross-sectional view of a state in which a valve body of the pressure reducing valve moves toward a seating portion; Figure 6 is a cross-sectional view showing a pressure reducing valve according to a second embodiment; Figure 7 is a cross-sectional view showing a pressure reducing valve according to a third embodiment; Figure 8 is a cross-sectional view showing a pressure reducing valve according to a fourth embodiment; Fig. 9 It is a cross-sectional view showing a pressure reducing valve according to another embodiment. DETAILED DESCRIPTION

[0012] Hereinafter, the pressure reducing valves 1, 1A to 1C of the first to fourth embodiments of the present disclosure will be described with reference to the aforementioned drawings. In addition, the concept of direction used in the following description is used for the convenience of description, and does not limit the orientation of the structure of the invention to the direction. Furthermore, the pressure reducing valves 1, 1A to 1C described below are only one embodiment of the present disclosure. Therefore, the present disclosure is not limited to the following embodiments, and additions, deletions, and changes can be made without departing from the scope of the main purpose of the invention.

[0013] <Pressure reducing valve> A pressure reducing valve 1 as a first embodiment and an example of a valve device is as follows: Figure 1 As shown, the pressure reducing valve 1 includes a casing 10, a valve body 11, and a leaf spring 12. The pressure reducing valve 1 reduces the pressure of a gas such as compressed natural gas and hydrogen to a working pressure or atmospheric pressure.

[0014] <Housing> The housing 10 is formed with a valve passage 13 and a valve space 14. In more detail, the housing 10 includes a housing block 10a and a cover 10b. The housing block 10a is provided with the valve passage 13. In addition, in the housing 10, the cover 10b covers the housing block 10a, thereby forming a valve space 14 in the housing 10.

[0015] The valve passage 13 has a primary passage 21, a valve chamber 22 and a secondary passage 23. In the valve passage 13, the gas flowing from the primary passage 21 is output to the secondary passage 23 through the valve chamber 22. To explain in more detail, the primary passage 21 and the valve chamber 22 are both formed along a specified axis L1. The valve chamber 22 is located on one side of the axial direction relative to the primary passage 21, and the primary passage 21 is connected to the valve chamber 22 via the valve port 21a. In addition, the axial direction is the direction along the axis L1. A seat portion 24 is formed on the housing 10 around the valve port 21a. The secondary passage 23 opens on the inner circumferential surface of the valve chamber 22 and is connected to the valve chamber 22. The secondary passage 23 extends from the inner circumferential surface of the valve chamber 22 in a direction intersecting the axis L1.

[0016] The valve space 14 is formed in the housing 10. More specifically, the valve space 14 is formed in the housing 10 on one axial side of the valve chamber 22. The valve space 14 is connected to the valve chamber 22. The valve space 14 is divided into an atmospheric chamber 25 and a secondary chamber 26 by a leaf spring 12 described in detail below.

[0017] <Valve body> The valve body 11 is accommodated in the housing 10. In more detail, the valve body 11 is inserted into the valve chamber 22 of the housing 10 so as to be movable in the axial direction. In addition, the valve body 11 is, for example, a cylindrical member and is molded from a synthetic resin. In addition, a sealing member 27 is arranged on the outer peripheral surface of the valve body 11. Moreover, the valve body 11 is inserted into the valve chamber 22 in a state sealed by the sealing member 27. Thus, the valve chamber 22 and the valve space 14 are sealed. In addition, one end portion of the valve body 11 in the axial direction protrudes from the valve space 14. Moreover, a leaf spring 12 described in detail later is installed on one axial end portion of the valve body 11. In addition, the valve body 11 is arranged so that the tip end portion 11a as the other axial end portion is opposite to the seat portion 24.

[0018] Furthermore, the valve body 11 adjusts the opening of the valve passage 13 according to the acting force (in this embodiment, the secondary pressure described later). To explain in more detail, the valve body 11 is inserted into the valve chamber 22 so as to be movable in the axial direction. An annular passage 22a is formed around the tip end 11a of the valve body 11. Therefore, the primary side passage 21 is connected to the secondary side passage 23 via the annular passage 22a. Furthermore, the valve body 11 moves in a form of approaching and moving away from the seat portion 24. Thus, the opening of the valve port 21a of the primary side passage 21 is adjusted by the valve body 11. That is, the opening of the passage 13 is adjusted by moving the valve body 11.

[0019] Furthermore, a communication passage 11b is formed on the valve body 11. The communication passage 11b is a passage that penetrates the valve body 11. In more detail, the communication passage 11b opens at the other axial end side of the outer peripheral surface of the valve body 11 and opens at one axial end. The communication passage 11b connects the annular passage 22a and the valve space 14 (in more detail, the secondary chamber 26 described in detail later).

[0020] <Leaf spring> The leaf spring 12 as a biasing member is accommodated in the housing 10. In more detail, the leaf spring 12 is accommodated in the valve space 14 of the housing 10. The leaf spring 12 is mounted on the valve body 11. Moreover, the leaf spring 12 extends from the valve body 11 to the radially outward direction of the valve body 11. In addition, the leaf spring 12 biases the valve body 11 in one axial direction (in this embodiment, the direction in which the valve body 11 is separated from the seat portion 24 and is the opening direction).

[0021] The structure of the leaf spring 12 is described in further detail below. The leaf spring 12 is, for example, a plate-shaped metal member (in this embodiment, a member made of SUS such as SUS304CSP or an alloy). The leaf spring 12 has the following shape. The leaf spring 12 is formed into a circular plate shape in a plan view. The leaf spring 12 is, for example, Figure 2As shown in the figure, the radial center portion (hereinafter referred to as the "center portion") 12a is formed into a convex cross-section that protrudes in one direction in the axial direction. In addition, the center portion 12a of the leaf spring 12 is formed to have a larger diameter than the outer shape of the valve body 11 and is flat. In addition, the outer edge portion 12b of the leaf spring 12 extends to the radially outer side than the valve space 14 in a plan view. Moreover, the outer edge portion 12b of the leaf spring 12 is formed to be flat. In the present embodiment, the outer edge portion 12b of the leaf spring 12 extends substantially straight in the radial direction.

[0022] Furthermore, the leaf spring 12 has a tapered portion 12c connecting the outer edge portion 12b and the central portion 12a. And, the tapered portion 12c is formed as follows. That is, the tapered portion 12c is formed in a tapered shape. Moreover, the tapered portion 12c is formed in a tapered shape at multiple angles, for example. The tapered portion 12c has different taper angles at the outer edge side portion 12d and the central side portion 12e. In the present embodiment, the taper angle of the central side portion 12e is sharper than the taper angle of the outer edge side portion 12d. Therefore, when the central portion 12a moves axially to the other side, the leaf spring 12 bends as follows. That is, the tapered portion 12c changes the relative angle between the outer edge side portion 12d and the central side portion 12e, and compresses and deforms at the same time (refer to Figure 2 Thus, the central portion 12a moves parallel to the other axial direction while the outer edge portion 12d maintains its shape. In addition, the tapered portion 12c does not necessarily have to be formed into a tapered shape with multiple angles. That is, the tapered portion 12c may also be formed with one taper angle.

[0023] As described above, the leaf spring 12 is mounted on one axial end of the valve body 11. In the present embodiment, the surface of the other axial side of the central portion 12a is joined to one axial end of the valve body 11. In addition, the leaf spring 12 has an insertion hole 12f formed in the central portion 12a. The insertion hole 12f is formed corresponding to the opening of the communication passage 11b located at one axial end of the valve body 11 (hereinafter referred to as the "secondary side opening"). In the present embodiment, the insertion hole 12f is formed to have a larger diameter than the secondary side opening.

[0024] In addition, as an installation method, for example, there is the following method. That is, a surface treatment is applied to the surface on the other axial side of the central part 12a. Examples of surface treatment include chemical treatment, physical treatment using laser irradiation, etc. After the surface treatment, a valve body 11 made of a synthetic resin such as PEEK, PPS, PI, and PAI is resin-molded and joined to the surface on the other axial side of the central part 12a. As other installation methods, installation using snap fit, adhesive materials, adhesive tape, and bushings, or installation by chemical bonding or outsert molding on a substrate can be considered. In addition, among these installation methods, it is preferred to use a sealing member or the like to ensure the sealing between the valve body 11 and the leaf spring 12.

[0025] Furthermore, when the valve body 11 is formed by resin molding, Figure 3 As shown in FIG. 1 , the valve body 11 is resin molded in a form in which a gate residue 11c is formed at one axial end portion thereof. More specifically, the insertion hole 12f of the leaf spring 12 is formed to have a larger diameter than the communication path 11b as described above. The gate residue 11c is formed on one axial end surface of the valve body 11 in a form located around the secondary side opening of the valve body 11 and inside the insertion hole 12f during resin molding. Moreover, the tip of the gate residue 11c is formed to be lower than the surface on one axial side of the leaf spring 12. In addition, in the present embodiment, a countersunk hole 11e is formed at one axial end portion (more specifically, one axial end) of the valve body 11, which is recessed toward the other axial direction around the secondary side opening. The gate residue 11c is formed in the countersunk hole 11e. In this way, even if the gate residue 11c is formed to be long in the axial direction, the tip of the gate residue 11c can be prevented from exceeding the surface on one axial side of the leaf spring 12. This prevents the gate residue 11 c from coming into contact with the top surface 14 a of the case 10 .

[0026] In addition, the leaf spring 12, such as Figure 4As shown, it is fixed to the housing 10. To explain in more detail, the outer edge portion 12b of the leaf spring 12 is fixed to the housing 10 throughout the entire circumference. To explain in more detail, the outer fixing portion 12g (i.e., the outer edge of the outer edge portion 12b) located outside the radial direction of the leaf spring 12 is fixed. In the present embodiment, the leaf spring 12 is fixed to the housing 10 by being clamped by the cover portion 10b and the housing block portion 10a throughout the entire circumference through the outer fixing portion 12g. To explain in more detail, the outer edge portion 12b of the leaf spring 12 is placed on the end face of the housing block portion 10a. Moreover, the cover portion 10b covers the housing block portion 10a in a manner that the respective end faces are butted against each other. Moreover, the cover portion 10b is screwed with the housing block portion 10a in the present embodiment. Thus, the outer edge of the leaf spring 12 is clamped by the end faces of the cover portion 10b and the housing block portion 10a. Alternatively, the cover 10b and the housing block 10a may be fastened by a plurality of fasteners (e.g., bolts). The outer edge of the leaf spring 12 is clamped by the cover 10b and the housing block 10a by fastening. The leaf spring 12 thus arranged resists the secondary pressure and urges the valve body 11 in the opening direction.

[0027] In addition, the leaf spring 12, such as Figure 1 As shown, the secondary chamber 26 and the atmospheric chamber 25 are formed in the housing 10. In more detail, the leaf spring 12 partitions the valve space 14 of the housing 10, thereby forming the atmospheric chamber 25 and the secondary chamber 26 in the housing 10.

[0028] The secondary chamber 26 is a chamber for introducing a secondary pressure, and the introduced secondary pressure acts on the valve body 11. The secondary chamber 26 is located on one side in the axial direction relative to the leaf spring 12. In the present embodiment, the secondary chamber 26 is mainly formed in the cover portion 10b. The secondary chamber 26, as described above, is isolated from the atmospheric chamber 25 by the leaf spring 12. On the other hand, the secondary chamber 26 is connected to the valve passage 13 (more specifically, the annular passage 22a) via the connecting passage 11b of the valve body 11. Therefore, the secondary pressure is introduced into the secondary chamber 26 via the connecting passage 11b. The leaf spring 12 receives the secondary pressure introduced into the secondary chamber 26. The secondary pressure acts on the valve body 11 in the other axial direction via the leaf spring 12. Moreover, the leaf spring 12 bends due to receiving the secondary pressure. In this way, the leaf spring 12 generates an elastic restoring force to apply force to the valve body 11 in one axial direction.

[0029] The atmospheric chamber 25 is a chamber maintained at atmospheric pressure in order to allow axial compression deformation of the leaf spring 12. The atmospheric chamber 25 is located on the opposite side of the secondary chamber 26 relative to the leaf spring 12, that is, on the other axial side. That is, the atmospheric chamber 25 is located on the valve chamber 22 side relative to the leaf spring 12. The atmospheric chamber 25 is open to the atmosphere. In more detail, an atmospheric opening passage 25a is formed on the housing 10. The atmospheric chamber 25 is open to the atmosphere via the atmospheric opening passage 25a. That is, the atmospheric chamber 25 is maintained at atmospheric pressure. Therefore, the atmospheric chamber 25 allows axial compression deformation of the leaf spring 12.

[0030] In addition, the leaf spring 12 is accommodated in the housing 10. Moreover, the leaf spring 12 is compressed and deformed in the axial direction at least when the secondary pressure is equal to the atmospheric pressure (i.e., in a non-pressurized state). In more detail, the housing 10 is formed as follows. That is, in the housing 10, the secondary chamber 26 is formed to have a smaller diameter than the atmospheric chamber 25. That is, the inner circumferential surface of the housing 10, such as Figure 4 As shown, there is a step 10c on the secondary chamber 26 side. To explain in more detail, the inner circumferential surface of the cover portion 10b protrudes radially inwardly more than the inner circumferential surface of the shell block portion 10a. Thus, in the housing 10, a step 10c is formed throughout the entire circumference between the cover portion 10b and the shell block portion 10a. The end surface on the other axial side of the step 10c is formed in a conical shape. To explain in more detail, the end surface on the other axial side of the step 10c is inclined in a form that protrudes in the other axial direction as it moves radially inward. Thus, the adjacent portion 12h adjacent to the outer fixing portion 12g in the outer edge portion 12b of the leaf spring 12 is pressed by the step 10c throughout the entire circumference. In this way, the leaf spring 12 is pressed in the other axial direction and is compressed and deformed in the axial direction.

[0031] Again, the leaf spring 12, such as Figure 3 As shown, the central portion 12a is pressed against the housing 10 and is compressed and deformed in the axial direction. In more detail, the surface of the central portion 12a of the leaf spring 12 on one side in the axial direction is pressed by the housing 10. In addition, the housing 10 is formed as follows in this embodiment. That is, in the housing 10, the central portion 12a of the leaf spring 12 abuts against the top surface 14a of the valve space 14. In more detail, in the housing 10, the height H from the outer fixing portion 12g to the top surface 14a (equivalent to the height of the secondary chamber 26, see Figure 1 ) is lower than the free height h of the leaf spring 12 (refer to Figure 2 Therefore, the central portion 12a of the leaf spring 12 abuts against the top surface 14a. In this way, the leaf spring 12 is compressed and deformed in the axial direction (refer to Figure 3 In addition, as an example, the top height H is set to 30% to 70% of the free height h.

[0032] <Operation of the pressure reducing valve> In the pressure reducing valve 1 thus constructed, Figure 1 As shown in FIG. 1 , the valve body 11 is forced in one axial direction by the leaf spring 12. Therefore, the valve passage 13 is opened. As a result, the gas is output from the primary passage 21 to the secondary passage 23 through the annular passage 22a of the valve chamber 22. In addition, the gas is also introduced from the annular passage 22a to the secondary chamber 26 via the connecting passage 11b. That is, the secondary pressure is introduced into the secondary chamber 26. Therefore, if the secondary pressure exceeds the specified pressure, as shown in FIG. Figure 5As shown, the valve body 11 moves to a position corresponding to the secondary pressure by the leaf spring 12. Thus, the opening of the valve passage 13 (more specifically, the opening of the valve port 21a) is adjusted according to the secondary pressure. In addition, the pressure reducing valve 1 maintains the secondary pressure at a predetermined pressure.

[0033] Furthermore, in the pressure reducing valve 1, in order to adjust the opening of the valve passage 13, the valve body 11 reciprocates in one axial direction and the other direction. When the valve body 11 reciprocates in one axial direction and the other direction, the leaf spring 12 repeatedly undergoes compression deformation and elastic reset. In this way, since the leaf spring 12 repeatedly oscillates in the axial direction, an amplitude load acts on the leaf spring 12 (more specifically, the adjacent portion 12h). In response to this, in the pressure reducing valve 1, the leaf spring 12 is pre-compressed and deformed in a non-pressurized state. That is, an initial load acts on the leaf spring 12. Therefore, the difference between the load acting on the leaf spring 12 in the pressurized state after the secondary pressure rises can be reduced. As a result, the load amplitude of the load acting on the leaf spring 12 during operation can be reduced.

[0034] In the pressure reducing valve 1 of the first embodiment, the leaf spring 12 is compressed and deformed in the axial direction. That is, an initial load can be applied to the leaf spring 12 in the axial direction before the valve body 11 operates. Therefore, when the valve body 11 reciprocates, the amount of change in the load applied to the leaf spring 12 can be suppressed. That is, the load amplitude generated on the leaf spring 12 can be reduced. As a result, the durability of the leaf spring 12 can be improved.

[0035] Furthermore, in the pressure reducing valve 1 of the first embodiment, the plate spring 12 is compressively deformed in the axial direction by the housing 10. Therefore, an increase in the number of components is suppressed.

[0036] Furthermore, in the pressure reducing valve 1 of the first embodiment, the adjacent portion 12h is pressed by the housing 10, whereby the leaf spring 12 is compressed and deformed in the axial direction. Therefore, a load can be applied in advance to the adjacent portion 12h where the load amplitude increases when the valve body 11 is in operation. As a result, the amount of change in the load when the valve body 11 reciprocates can be reduced. That is, the load amplitude can be reduced.

[0037] In the pressure reducing valve 1 of the first embodiment, the central portion 12a is pressed by the housing 10, whereby the plate spring 12 is compressed and deformed in the axial direction. Therefore, when the valve body 11 reciprocates, the load amplitude is suppressed from increasing.

[0038] Furthermore, in the pressure reducing valve 1 of the first embodiment, the valve body 11 is attached to the central portion 12a of the leaf spring 12. Therefore, it is easy to make the direction of pressing the leaf spring 12 coincide with the moving direction of the valve body 11. Therefore, partial contact or the like during the reciprocating motion of the valve body 11 can be suppressed, so that the valve body 11 can be moved smoothly.

[0039] In the pressure reducing valve 1 of the first embodiment, the valve body 11 has a gate residue 11c at one axial end portion. Therefore, the gate residue 11c is prevented from contacting the seat portion 24 when the valve body 11 is operated. Therefore, the valve seat performance of the seat portion 24 is prevented from being degraded due to the gate residue.

[0040] [Second embodiment] Figure 6 The pressure reducing valve 1A of the second embodiment shown in the figure is similar in structure to the pressure reducing valve 1 of the first embodiment. Regarding the structure of the pressure reducing valve 1A of the second embodiment, the points different from the pressure reducing valve 1 of the first embodiment are mainly described, and the same symbols are given to the same structures, and the description is omitted. The same is also true for the pressure reducing valves 1B and 1C of the third and fourth embodiments described later. In the pressure reducing valve 1A of the second embodiment, the connecting passage 11Ab of the valve body 11A has a throttling portion 11g. To explain in more detail, the connecting passage 11Ab has a first passage portion 11d and a plurality of second passage portions 11e (two second passage portions 11e in the present embodiment). The first passage portion 11d extends axially in the valve body 11. The first passage portion 11d opens at one axial end of the valve body 11 and is connected to the secondary chamber 26. The second passage portions 11e extend radially at the other axial end of the valve body 11. The second passage portions 11e open at the other axial end of the outer peripheral surface of the valve body 11 and are connected to the annular passage 22a. Moreover, the second passage portions 11e are connected to the first passage portion 11d via the throttling portion 11g on the radial inner side. In the present embodiment, the throttling portion 11g is formed into a tapered shape that gradually becomes thinner as it moves radially inward. Therefore, the communication passage 11Ab is narrowed at the throttle portion 11g, and the transmission of pressure fluctuations is suppressed when the secondary pressure is introduced into the secondary chamber 26. In the pressure reducing valve 1A of the second embodiment, the communication passage 11Ab has a throttle portion 11g. Therefore, it is possible to suppress the secondary pressure vibration and the surge pressure in the secondary pressure from being transmitted to the secondary chamber 26. As a result, it is possible to suppress the leaf spring 12 and the valve body 11 from being affected by the secondary pressure vibration and the surge pressure. Therefore, it is possible to suppress the valve body 11 from causing vibration. Otherwise, the pressure reducing valve 1A of the second embodiment has the same operational effects as those of the pressure reducing valve 1 of the first embodiment.

[0041] [Third embodiment] exist Figure 7In the pressure reducing valve 1B of the third embodiment shown, the communication passage 11Bb of the valve body 11B has a throttling portion 11g. To explain in more detail, the communication passage 11Bb has a first passage portion 11d and a plurality of second passage portions 11Be (four second passage portions 11Be in this embodiment). The second passage portions 11Be extend radially at the other axial end side of the valve body 11. The second passage portions 11Be are opened at the other axial end side of the outer peripheral surface of the valve body 11 and connected to the annular passage 22a. In addition, the second passage portions 11e are connected to the first passage portion 11d radially inward. In addition, a throttling member 11f is inserted into the second passage portion 11e. The throttling member 11f is formed in a cylindrical shape, and the inner hole is formed as the throttling portion 11g. Therefore, the throttling portion 11g is formed on the second passage portion 11e. The passage width is narrowed at the throttling portion 11g in the communication passage 11Bb. Therefore, the communication passage 11Bb also suppresses the transmission of pressure fluctuations when the secondary pressure is introduced into the secondary chamber 26 .

[0042] The pressure reducing valve 1B according to the third embodiment achieves the same operational effects as the pressure reducing valve 1A according to the second embodiment.

[0043] [Fourth embodiment] exist Figure 8 In the pressure reducing valve 1C of the fourth embodiment shown, the communicating passage 11Cb of the valve body 11C has a throttling portion 11g. To explain in more detail, the communicating passage 11Cb has a first passage portion 11d and a plurality of second passage portions 11Be (four second passage portions 11Be in this embodiment). A throttling member 11Cf is inserted into the first passage portion 11d. The throttling member 11Cf is formed in a cylindrical shape, and the inner hole is configured as the throttling portion 11g. Therefore, the throttling portion 11g is formed on the first passage portion 11d. The communicating passage 11Cb also narrows the passage width at the throttling portion 11g. Therefore, the communicating passage 11Cb also suppresses the transmission of pressure changes when the secondary pressure is introduced into the secondary chamber 26.

[0044] The pressure reducing valve 1C of the fourth embodiment also achieves the same operational effects as the pressure reducing valve 1B of the third embodiment.

[0045] [Other embodiments] In the present embodiment, the pressure reducing valve 1 is described as an example of a valve device, but the valve device is not limited to the pressure reducing valve 1. The valve device may be, for example, an on-off valve or a pressure relief valve, as long as it is a valve device that applies force to the valve body 11 in the axial direction against gas pressure such as primary pressure or secondary pressure. Such a valve device also has the same effect as the pressure reducing valve 1. That is, the leaf spring 12 is compressed and deformed in the axial direction by the housing 10. That is, an initial load can be applied to the leaf spring 12 in the axial direction before the valve body 11 works. Therefore, when the valve body 11 reciprocates, the change in the load acting on the leaf spring 12 can be suppressed. That is, the amplitude of the load acting on the leaf spring 12 can be reduced. Thus, the durability of the leaf spring 12 can be improved. In addition, in the valve device, one axial direction does not necessarily have to be limited to the opening direction, but can also be the closing direction. Furthermore, in the pressure reducing valve 1, the leaf spring 12 abuts against the top surface 14a, but it can also be, as Fig. 9 On the other hand, in the pressure reducing valve 1, the step 10c is formed on the housing 10 in order to compress and deform the leaf spring 12, but the step 10c may not be present. That is, it is sufficient as long as the leaf spring 12 is compressed and deformed by at least one of the top surface 14a and the step 10c. Furthermore, the portion of the adjacent portion 12h that presses the leaf spring 12 is not necessarily limited to the step 10c, but may be a protrusion. The step 10c may also be a component different from the cover portion 10b. Such a step 10c is included in the housing 10 even if it is the cover portion 10b.

[0046] In addition, the leaf spring 12 does not necessarily have to be installed on the end surface of the valve body 11, but may be installed on the side surface of the valve body 11. In addition, the leaf spring 12 is not limited to the aforementioned shape, as long as it is a plate (for example, a rectangle) extending radially outward from the valve body 11. In addition, the leaf spring 12 does not necessarily have to have a pressure-bearing function or a sealing function, but may be realized by the valve body 11 or other components. That is, a pressure-bearing portion may be formed on the valve body 11, or an O-ring or a diaphragm may be used to achieve sealing. In addition, the valve body 11 does not necessarily have to be limited to being made of synthetic resin, but may be made of metal.

[0047] Furthermore, the shape of the valve passage 13 is not limited to the above-mentioned shape. For example, the secondary side passage 23 may be connected to the secondary chamber 26. Furthermore, in order to introduce the secondary pressure into the secondary chamber 26, the valve body 11 does not necessarily have to be formed with a Figure 1 For example, a passage connecting the secondary passage 23 (or the annular passage 22a) and the secondary chamber 26 may be formed in the housing 10. In addition, the secondary passage 23 may be connected to the secondary chamber 26 via a passage and an external pipe.

[0048] In the pressure reducing valves 1B and 1C of the third and fourth embodiments, the throttle members 11f and 11Cf are inserted into the passages 11Be and 11d to form the throttle portion 11g, but the throttle portion may be directly formed on the passages 11Be and 11d. In addition, the throttle portion 11g of the pressure reducing valve 1C of the fourth embodiment may be formed in a tapered shape as in the pressure reducing valve 1A of the second embodiment.

[0049] <Exemplary Embodiment> The pressure reducing valve of the first aspect comprises: a housing in which a valve passage is formed; a valve body which is movably accommodated in the housing in the axial direction and adjusts the opening of the valve passage according to the secondary pressure; and a biasing member which is accommodated in the housing and biases the valve body in the axial direction against the secondary pressure, the biasing member being a plate-shaped spring which extends radially outward from the valve body and is compressed and deformed in the axial direction at least when the secondary pressure is equal to the atmospheric pressure.

[0050] According to the above aspect, the force-applying member is compressed and deformed in the axial direction. That is, an initial load can be applied to the force-applying member in the axial direction before the valve body works. Therefore, when the valve body reciprocates, the change in the load acting on the force-applying member can be suppressed. That is, the load amplitude generated on the force-applying member can be reduced. As a result, the durability of the force-applying member can be improved.

[0051] A pressure reducing valve according to a second aspect is the pressure reducing valve according to the first aspect, wherein the urging member is compressively deformed in the axial direction by the housing.

[0052] According to the above aspect, the urging member is compressively deformed in the axial direction by the housing. Therefore, it is possible to suppress an increase in the number of components.

[0053] The pressure reducing valve according to a third aspect is the pressure reducing valve according to the second aspect, wherein the urging member is fixed to an outer fixing portion located radially outward by the housing, and is pressed by the housing through an adjacent portion radially inward of the outer fixing portion to be compressed and deformed in the axial direction.

[0054] According to the above aspect, the adjacent portion is pressed by the housing, whereby the force-applying member is compressed and deformed in the axial direction. Therefore, the load can be applied in advance to the adjacent portion where the load amplitude increases when the valve body is working. As a result, the change in the load when the valve body reciprocates can be reduced. That is, the load amplitude can be reduced.

[0055] A pressure reducing valve according to a fourth aspect is the pressure reducing valve according to the second or third aspect, wherein the urging member is formed into a convex shape with a radial center portion protruding in one axial direction, and is compressed and deformed in the axial direction by being pressed by the housing at the radial center portion.

[0056] According to the above aspect, the radially central portion is pressed by the housing, whereby the urging member is compressed and deformed in the axial direction. Therefore, when the valve body reciprocates, the load amplitude can be reduced.

[0057] A pressure reducing valve according to a fifth aspect is the pressure reducing valve according to the fourth aspect, wherein the valve body is attached to a radially central portion of the urging member.

[0058] According to the above aspect, the valve body is mounted on the radial center of the force member. Therefore, it is easy to make the direction of pressing the force member consistent with the moving direction of the valve body. Therefore, partial contact during the reciprocating motion of the valve body can be suppressed, so that the valve body moves smoothly.

[0059] The pressure reducing valve of the sixth aspect is, in the pressure reducing valve of any one of the first to fifth aspects, the shell includes a seating portion on which the valve body seats, the valve body has a gate residue generated during molding at one axial end portion, and the valve passage is closed by seating the other axial end portion on the seating portion.

[0060] According to the above aspect, the adjacent portion is pressed by the housing, whereby the force-applying member is compressed and deformed in the axial direction. Therefore, the load can be applied in advance to the adjacent portion where the load amplitude increases when the valve body is working. As a result, the change in the load when the valve body reciprocates can be reduced. That is, the load amplitude can be reduced.

[0061] According to the valve device according to claim 1, the pressure reducing valve of the seventh aspect, in the pressure reducing valve of any one of the first to sixth aspects, the shell includes a secondary chamber, the valve body includes a connecting path for introducing secondary pressure into the secondary chamber, the force-applying member receives the secondary pressure introduced into the secondary chamber, and moves the valve body to a position corresponding to the secondary pressure received, and the connecting path has a throttling portion.

[0062] According to the above aspect, the connecting passage for introducing the secondary pressure into the secondary chamber has a throttling portion. Therefore, it is possible to suppress the secondary pressure vibration and the impact pressure in the secondary pressure from being transmitted to the secondary chamber. Thus, it is possible to suppress the influence of the secondary pressure vibration and the impact pressure on the force-applying member and the valve body. Therefore, the valve body is suppressed from causing vibration.

[0063] The valve device of the eighth aspect comprises: a shell forming a valve passage; a valve body accommodated in the shell so as to be movably in the axial direction, and changing the opening of the valve passage by changing its position according to the acting force; and a biasing member accommodated in the shell, resisting the acting force and biasing the valve body in one axial direction to open the valve passage, the biasing member being a plate-shaped spring extending laterally from the valve body and being compressed and deformed in the axial direction by the shell.

[0064] According to the above aspect, the force member is compressed and deformed in the axial direction by the housing. That is, an initial load can be applied to the force member in the axial direction when the valve body is working. Therefore, when the valve body reciprocates, the change in the load acting on the force member can be suppressed. That is, the amplitude of the load acting on the force member can be reduced. As a result, the durability of the force member can be improved.

[0065] According to the valve device according to claim 1, the pressure reducing valve of the ninth aspect, in the pressure reducing valve of the eighth aspect, the shell includes a secondary chamber, the valve body includes a connecting path for introducing secondary pressure into the secondary chamber, the force-applying member receives the secondary pressure introduced into the secondary chamber, moves the valve body to a position corresponding to the secondary pressure received, and the connecting path has a throttling portion.

[0066] According to the above aspect, the connecting passage for introducing the secondary pressure into the secondary chamber has a throttling portion. Therefore, it is possible to suppress the secondary pressure vibration and the impact pressure in the secondary pressure from being transmitted to the secondary chamber. Thus, it is possible to suppress the influence of the secondary pressure vibration and the impact pressure on the force-applying member and the valve body. Therefore, the valve body is suppressed from causing vibration.

[0067] Based on the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be interpreted as an example only and is provided to show the best mode for implementing the present invention to those skilled in the art. The details of its structure and / or function can actually be changed without departing from the spirit of the present invention.

[0068] Explanation of symbols: 1 Pressure reducing valve; 1A Pressure reducing valve; 10 housing; 11. Valve body; 11c Gate residue; 12 leaf spring (force applying member); 12a Central part; 12g lateral fixation; 12h adjacent part; 13 valve passage; 24 Seating area.

Claims

1. A pressure reducing valve, characterized in that: have: a housing forming a valve passage; a valve body which is accommodated in the housing so as to be movable in the axial direction and adjusts the opening degree of the valve passage according to the secondary pressure; and a biasing member accommodated in the housing and biasing the valve body in one axial direction against the secondary pressure, The urging member is a plate-shaped spring extending radially outward from the valve body, and is compressed and deformed in the axial direction at least when the secondary pressure is equal to the atmospheric pressure.

2. The pressure reducing valve according to claim 1, characterized in that: The urging member is compressively deformed in the axial direction by the housing.

3. The pressure reducing valve according to claim 2, characterized in that: The urging member has an outer fixing portion located radially outward fixed by the housing, and is pressed by the housing through an adjacent portion radially inward of the outer fixing portion to be compressively deformed in the axial direction.

4. The pressure reducing valve according to claim 2 or 3, characterized in that: The urging member is formed in a convex shape with a radially central portion protruding in one axial direction, and is compressed and deformed in the axial direction by the radially central portion being pressed by the housing.

5. The pressure reducing valve according to claim 4, characterized in that: The valve body is mounted on a radially central portion of the urging member.

6. The pressure reducing valve according to claim 1, characterized in that: The housing includes a seating portion on which the valve body is seated. The valve body has a gate residue formed during molding at one axial end portion, and the valve passage is closed by seating the other axial end portion on the seating portion.

7. The pressure reducing valve according to claim 1, characterized in that: The housing includes a secondary chamber, The valve body includes a communication path for introducing the secondary pressure into the secondary chamber. The biasing member receives the secondary pressure introduced into the secondary chamber, and moves the valve body to a position corresponding to the received secondary pressure. The communication passage has a throttle portion.

8. A valve device, characterized in that: have: a housing forming a valve passage; a valve body accommodated in the housing so as to be movable in the axial direction and which changes its position according to an acting force to change the opening of the valve passage; and a biasing member accommodated in the housing and biasing the valve body in one axial direction to open the valve passage against the acting force; The urging member is a plate-shaped spring extending laterally from the valve body, and is compressed and deformed in the axial direction by the housing.

9. The valve device according to claim 8, characterized in that The housing includes a secondary chamber, The valve body includes a communication path for introducing the secondary pressure into the secondary chamber. The biasing member receives the secondary pressure introduced into the secondary chamber, and moves the valve body to a position corresponding to the received secondary pressure. The communication passage has a throttle portion.

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