Pressure control valve

Abstract

To provide a pressure control valve capable of smoothly performing mounting work and removal work for a fluid path.SOLUTION: A pressure control valve 100a is inserted into a fluid path, and comprises a valve body 10 having a bottomed cylindrical shape and provided with a valve seat 12a, and a valve element 20 that moves in an axial direction L and seats on or unseats relative to the valve seat 12a. The valve body 10 is integrally provided with removal direction biasing means 80, and in a mounting state where the valve body 10 is inserted into the fluid path by fixing means C that is in contact with one end part of the valve body 10, the removal direction biasing means 80 has a biasing force that biases the valve body 10 in a removal direction of the fluid path. Consequently, it is possible for the pressure control valve 100a to be smoothly mounted and removed for the fluid path.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pressure regulating valve having a removal direction biasing means. [Background technology]

[0002] Depending on the user's application, there has been a demand for pressure regulating valves to be mounted in various piping paths, particularly in fluid paths formed in piping blocks in order to reduce weight and space.

[0003] Here, Patent Document 1 describes a check valve 1400 (hereinafter referred to as a "conventional pressure regulating valve") as shown in FIG. 14, which comprises a valve body 1410 having a valve seat 1412 and a valve body 1420 that seats on and releases from the valve seat 1412, and the check valve 1400 is inserted into an accommodation space As formed in the vertical direction of a piping block B14 and is fluidly connected to a primary side flow path Fp1 and a secondary side flow path Fp2.

[0004] Furthermore, Patent Document 1 describes a method in which a wave washer 1480 is disposed at the back of the accommodation space As before inserting the check valve 1400 into the accommodation space As in order to reduce the impact caused by the collision between the valve body 1420 and the valve seat 1412 and to prevent the check valve 1400 from rattling within the accommodation space As. As a result, in the attached state, the wave washer 1480 generates a biasing force on the check valve 1400 in the removal direction.

[0005] However, in Patent Document 1, a wave washer 1480 that is separate from the check valve 1400 is used as a biasing member in the removal direction, and this wave washer 1480 is installed on the bottom surface of the storage space As by falling vertically under its own weight (see particularly paragraphs

[0025] ,

[0028] -

[0032] and FIG. 1 of Patent Document 1), so mainly the following four problems were present:

[0006] First, in conventional pressure regulating valves, an appropriate wave washer 1480 is selected and inserted into the accommodation space As at the installation site, but there was a risk of human error resulting in the use of an incorrect wave washer 1480 (e.g., one with a smaller spring constant than the desired one) (hereinafter referred to as "Conventional Problem 1 (use of an incorrect biasing member at the installation site)").

[0007] Secondly, the conventional pressure regulating valve utilizes the vertical drop of the wave washer 1480 and is installed on the bottom surface of the accommodation space As, that is, it is assumed that the accommodation space As opens vertically upward. Therefore, it cannot be adopted when the accommodation space As opens horizontally to the side or vertically downward (hereinafter referred to as "Conventional problem 2 (restriction on installation direction)").

[0008] Thirdly, the conventional pressure regulating valve needs to be removed from the accommodation space As during maintenance. The wave washer 1480 used here has a relatively small axial length and a small biasing force in the removal direction, so if a foreign object or the like is caught between the outer circumferential surface of the valve body 1410 and the inner circumferential surface of the accommodation space As, it may be difficult to remove the conventional pressure regulating valve with only the biasing force of the wave washer 1480 (hereinafter referred to as "Conventional problem 3 (difficult to remove due to small biasing force)").

[0009] As a third measure, it is possible to use a biasing member, such as a coil spring, that has a relatively large axial length and a large biasing force in the removal direction, instead of the wave washer 1480; however, the greater the axial length of the biasing member, the more likely it is to be disposed in a state that is bent or tilted relative to the axial direction. Under such circumstances, when removing a conventional pressure regulating valve from the accommodation space As, the biasing force acts in a direction tilted relative to the axial direction, which may cause galling between the outer circumferential surface of the valve body 1410 and the inner wall of the accommodation space As, making removal even more difficult (hereinafter referred to as "Conventional problem 4 (difficulty in removal due to tilted biasing force)"). [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2012-184820 A Summary of the Invention [Problem to be solved by the invention]

[0011] An object of the present invention is to provide a pressure regulating valve that can be smoothly attached to and removed from a fluid path. [Means for solving the problem]

[0012] In order to solve the above problems, a pressure regulating valve that is inserted into a fluid pathway is a pressure regulating valve that is inserted into a fluid pathway, and has a bottomed cylindrical shape and comprises a valve body having a valve seat, and a valve disc that moves in an axial direction and seats on and releases from the valve seat, the valve body being integrally provided with a removal direction biasing means, and in an attachment state in which the valve body is inserted into the fluid pathway by a fixing means abutting one end of the valve body, the removal direction biasing means has a biasing force that biases the valve body in the removal direction of the fluid pathway.

[0013] In addition, in the above pressure regulating valve, the biasing force of the removal direction biasing means may be set to be greater than the force that the valve body receives from the fluid pressure, so that the valve body does not move in the installation direction due to fluid pressure in the installed state.

[0014] In addition, in the above pressure regulating valve, the valve body may include a stopper portion, and in the attached state, the stopper portion may abut against the fluid path, thereby regulating the amount of deformation generated in the removal direction biasing means.

[0015] In addition, in the above pressure regulating valve, in the installed state, a sealing member may be sandwiched between an outer peripheral surface of the valve body and an inner peripheral surface of the fluid path, and the deformation amount of the removal direction biasing means may be set to be greater than the distance that the sealing member moves in the axial direction in a compressed state when the valve body is inserted into the fluid path.

[0016] The above pressure regulating valve may further include a pressure-sensing bellows unit that urges the valve body toward the valve seat, the pressure-sensing bellows unit having a boss portion protruding from the other end, the boss portion having a crimp portion that is fitted and fixed into an opening provided in a bottom portion of the valve body and an opening provided in the removal direction urging means, respectively.

[0017] In addition, in the above pressure regulating valve, the valve body may include a main body and a valve seat portion having the valve seat, and may further include a position adjustment portion that can displace the relative axial positions of the main body and the valve seat portion, and the position adjustment portion may determine the overall axial length of the valve body.

[0018] In addition, in the above pressure regulating valve, the removal direction biasing means may have a fixing portion fixed directly or indirectly to the bottom of the valve body, a contact portion that contacts the fluid path in the attached state, and a connecting portion that connects the fixing portion and the contact portion.

[0019] In addition, in the above pressure regulating valve, the valve body may have a bottomed cylindrical shape that opens to one end, and a pressure equalizing path extending in the axial direction of the valve body may be provided in the valve body to equalize the pressure in the storage space defined between the other end of the valve body and the fluid path.

[0020] Moreover, in the above pressure regulating valve, a joint portion for fixing the main body and the valve seat portion may be formed on one end side of each of the main body and the valve seat portion, one end of the valve seat portion may have a pressing portion pressed against the fixing means, and the joint portion may be formed on the other end side of the pressing portion.

[0021] In addition, the connection structure may be such that the pressure regulating valve and the fixing means having a shape corresponding to the opening of the fluid path are inserted into the fluid path to connect the pressure regulating valve to the fluid path. Effect of the Invention

[0022] According to the present invention, it is possible to provide a pressure regulating valve that can be smoothly attached to and removed from a fluid path. [Brief description of the drawings]

[0023] [Figure 1] 1A and 1B are explanatory diagrams showing a pressure regulating valve according to a first embodiment of the present invention, in which (a) is a longitudinal sectional view of the pressure regulating valve, (b) is a longitudinal sectional view of a biasing member used in (a), and (c) is a top view of the biasing member shown in (b). [Diagram 2] 1A and 1B are explanatory views of the biasing member in biasing member modification examples 1 to 3 of the first embodiment, where (a) and (b) are a vertical cross-sectional view and a top view of biasing member modification example 1 of the first embodiment, (c) and (d) are a vertical cross-sectional view and a top view of biasing member modification example 2 of the first embodiment, and (e) and (f) are a vertical cross-sectional view and a top view of biasing member modification example 3 of the first embodiment, respectively. [Diagram 3] 3A to 3C are cross-sectional views showing the operation of attaching the pressure regulating valve shown in FIG. 1 to a piping block and the operation of removing the same. [Figure 4] 4A and 4B are cross-sectional views showing the pressure regulating valve shown in FIG. 3 attached to a piping block, where (a) is an overall view, and (b) is an enlarged view of the area surrounded by dashed line IVb shown in (a). [Diagram 5] 5 is an explanatory diagram of a modified pressure equalizing passage of the first embodiment, and is an enlarged view of a region surrounded by a dashed line V shown in FIG. 4. FIG. [Figure 6] FIG. 5 is an explanatory diagram of a modification of the position adjustment joint according to the first embodiment, and is an enlarged view of the area surrounded by the dashed line VI shown in FIG. [Figure 7]7A and 7B are explanatory diagrams of a modified sealing member of the first embodiment, in which (a) is an overall view (corresponding to FIG. 4A), and (b) is an enlarged view (corresponding to FIG. 4B) of the area surrounded by dashed line VIIb shown in (a). [Figure 8] FIG. 5 is an explanatory diagram (corresponding to FIG. 4(a)) of a stopper portion according to a first modification of the first embodiment. [Figure 9] 9A and 9B are explanatory diagrams of a second modified example of the stopper portion of the first embodiment, in which (a) is an enlarged view of the area surrounded by the dashed line IXa shown in FIG. 8, and (b) and (c) are a longitudinal sectional view and a top view, respectively, of the stopper member used in (a). [Figure 10] 9 is an explanatory diagram of a third modified example of a stopper portion of the first embodiment, and is an enlarged view of a region surrounded by a dashed line X shown in FIG. 8. [Figure 11] FIG. 5 is an explanatory diagram (corresponding to FIG. 4(a)) showing a pressure regulating valve according to a second embodiment of the present invention. [Figure 12] 4(a) and 4(b) and 4(c) are a vertical cross-sectional view and a top view of a stopper member used in (a); and (d) and 4(e) are a vertical cross-sectional view and a top view of a biasing member used in (a). [Figure 13] 13A and 13B are explanatory diagrams of a modified example of the biasing unit of the third embodiment, in which (a) is an overall view (corresponding to FIG. 4A), and (b) and (c) are a vertical cross-sectional view and a top view, respectively, of a stopper member used in (a). [Figure 14] FIG. 1 is a cross-sectional view showing a pressure regulating valve according to a conventional technique. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An embodiment of the present invention will be described in detail with reference to Figures 1 to 13. However, the present invention is not limited to this embodiment.

[0025] <Terminology> In the present specification and claims, the terms "left", "right", "upper" and "lower" refer to the directions shown in Figs. 1(a), (b), 2(a), (c), (e), 3 to 8, 9(a), (b), 10 to 11, 12(a), (b), (d), and 13(a), (b). In the present specification and claims, the terms "one end" and "other end" refer to the "lower end" and "upper end" in the drawings. In the present specification and claims, the term "effective pressure-receiving area of ​​the pressure-sensing bellows" refers to the pressure-receiving area as an approximation calculated based on the average diameter of the minimum inner diameter of the bellows shape (the inner diameter of the "valley" part of the bellows shape that protrudes toward the central axis of the pressure-sensing bellows) and the maximum outer diameter (the outer diameter of the "peak" part of the bellows shape that protrudes in a direction away from the central axis of the pressure-sensing bellows). In the present specification and claims, the term "position adjustment section" refers to a "configuration capable of displacing the relative axial positions of the main body and the valve seat section." In the present specification and claims, the terms "attachment direction" and "removal direction" refer to "directions of movement when the pressure regulating valve is attached to the fluid path and removed." In the present specification and claims, the term "removal direction biasing means" refers to "means having a biasing force for biasing the valve main body in the removal direction of the fluid path when the valve main body is attached to the fluid path (for example, a biasing member (one-legged leaf spring, two-legged leaf spring, three-legged leaf spring, four-legged leaf spring) or a biasing unit (a coil spring that biases via an abutting member))." In the present specification and claims, the term "sealing member sliding distance" refers to "the distance the seal member moves in a compressed state when the valve main body is inserted into the fluid path." In the present specification and claims, "the force that the valve body receives from the fluid pressure" refers to "the product of the pressure difference that one end side and the other end side of the valve body receive when the valve is closed and the cross-sectional area of ​​the valve body." In the present specification and claims, "fixing means" refers to "something that holds the valve body in the axial direction within the fluid path (for example, a connector having a shape corresponding to the opening of the fluid path, or a C-shaped ring that is provided in the inner circumferential groove of the fluid path and generates an elastic force in the radial direction, etc.)." In the present specification and claims, "connection structure" refers to "a structure that connects the pressure regulating valve to the fluid path."In the present specification and claims, the term "pressure regulating valve unit" refers to a unit consisting of a pressure regulating valve and a fixing means.

[0026] (First embodiment) <About the pressure regulating valve configuration> A pressure regulating valve 100a according to a first embodiment of the present invention will be described with reference to Fig. 1. The pressure regulating valve 100a is mainly composed of a valve body 10, a valve element 20, a slide unit 30, an adjusting spring unit 40, a pressure-sensing bellows unit 50, a sliding member 70, and a biasing member 80 (removal direction biasing means). Each component of the pressure regulating valve 100a will be described in order below. A high primary side pressure P1 is introduced to the primary side port 1A, while a low secondary side pressure P2 is introduced to the secondary side port 1B.

[0027] Here, although details will be described later, in the pressure regulating valve 100a of the first embodiment, the desired biasing member 80 is integrally provided on the valve body 10 before shipping, and in a state in which the valve body 10 is attached to the fluid path, the desired biasing member 80 has a biasing force that biases the valve body 10 in the removal direction of the fluid path. As a result, the pressure regulating valve 100a of the first embodiment solves all of the conventional problem 1 (use of an incorrect biasing member at the installation site), conventional problem 2 (restriction on the installation direction), conventional problem 3 (difficulty in removal due to small biasing force), and conventional problem 4 (difficulty in removal due to tilted biasing force), and can smoothly perform the installation work and removal work of the pressure regulating valve 100a to the fluid path.

[0028] The valve body 10 is made of a metal such as stainless steel or aluminum, and comprises a main body 11 having a cylindrical shape with a bottom, and a valve seat portion 12 that is formed separately from the main body 11 and has an approximately cylindrical shape.

[0029] The main body 11 defines an accommodation chamber A therein, and has a side wall with a plurality of (e.g., four) horizontal holes 11a that are evenly arranged in the circumferential direction as viewed from the direction of the axis L and define the secondary side port 1B. In addition, an opening 11o that is coaxial with the axis L is formed in the bottom portion 11u of the main body 11.

[0030] The valve seat portion 12 includes an annular valve seat 12a, an inner circumferential surface 12b that defines the primary side port 1A, a pair of rotary tool insertion portions 12c formed on one end face and arranged at symmetrical positions across the axis L, and an open end 12d provided on the one end side.

[0031] The valve body 20 is made of a metal such as stainless steel or phosphorus bronze and has a generally circular disk shape. The valve body 20 includes an annular valve portion 21 and a boss portion 22 that protrudes coaxially with the axis L from one end side.

[0032] The valve portion 21 has an outer diameter larger than the valve seat 12a, and is seated on or separated from the valve seat 12a by moving in the direction of the axis L. The boss portion 22 is fitted into an opening of the sliding contact member .

[0033] The slide unit 30 includes a cylindrical cylinder member 31 fixed to the valve body 20 at one end, a connecting member 32 abutted against a fixing metal fitting 52 at the other end by the biasing force of a valve spring 41, and a piston member 33 whose other end is fixed to the connecting member 32 by crimping and whose one end is supported by the cylinder member 31 so as to be movable forward and backward, and is provided inside the pressure-sensing bellows 51. Here, the valve spring 41 is sandwiched in a pressed state between the cylinder member 31 and the connecting member 32. Thus, the slide unit 30 transmits the biasing force of the valve spring 41 to the pressure-sensing bellows 51, thereby biasing the pressure-sensing bellows 51 in the extension direction along the axis L.

[0034] The adjustment spring unit 40 includes a valve spring 41, which is a compression spring, and an adjustment screw portion 42 (position adjustment portion) that can displace the relative positions of the main body 11 and the valve seat portion 12 in the axial L direction. The adjustment screw portion 42 expands and contracts the valve spring 41 and the pressure-sensing bellows 51 to adjust the biasing force against the valve body 20.

[0035] The adjustment screw portion 42 is composed of a body-side adjustment screw portion 42a formed on the inner peripheral surface of one end of the body 11 and a valve seat-side adjustment screw portion 42b formed on the outer peripheral surface of the other end of the valve seat portion 12, which are screwed together. Here, the position adjustment work of the valve seat portion 12 relative to the valve body 20 is performed before shipping by engaging an adjustment jig (not shown) with a pair of rotary tool insertion portions 12c, and rotating the valve seat portion 12 relative to the body 11 via the adjustment screw portion 42 and moving it in the direction of the axis L. This allows the expansion and contraction of the valve spring 41 and the pressure-sensing bellows 51, i.e., the biasing force against the valve body 20, to be adjusted so that the valve opens at a desired valve opening pressure setting value. Furthermore, after the biasing force against the valve body 20 is adjusted by the position adjustment work, a welded portion W is provided to continuously fix the open end 12d of the valve seat portion 12 and the open end 11d of the body 11 to each other in the circumferential direction by welding or the like while the valve body 20 is biased against the valve seat portion 12. Therefore, before shipping, the adjustment screw portion 42 (position adjustment portion) determines the overall length La (see FIG. 4(a)) of the valve body 10 in the axial L direction.

[0036] The pressure-sensing bellows unit 50 is made of a metal such as stainless steel or phosphorus bronze, and includes a pressure-sensing bellows 51 formed by press molding into a bellows shape extending in the axial direction L, and a fixing bracket 52 having an approximately circular plate shape.

[0037] One end of the pressure-sensing bellows 51 is welded to the other end surface of the outer periphery of the valve body 20, and the other end is welded to one end surface of the outer periphery of the fixing metal fitting 52, so that the inside is sealed.

[0038] Here, the effective pressure-receiving area of ​​the pressure-sensing bellows 51 is set to be equal to the pressure-receiving area of ​​the valve element 20 surrounded by the valve seat portion 12. As a result, the upward force acting on the pressure-sensing bellows 51 and the downward force acting on the valve element 20 due to the secondary pressure P2 cancel each other out. Therefore, the valve element 20 is not affected by the secondary pressure P2, and the opening degree of the valve element 20 can be variably controlled in response to fluctuations in the primary pressure P1. Note that the dimensions of each part of the pressure regulating valve 100a can be set using the actual pressure-receiving area obtained through experiments, not limited to the pressure-receiving area (effective pressure-receiving area) as an approximation calculated based on the average inner diameter of the minimum and maximum inner diameters of the bellows shape.

[0039] The fixing metal fitting 52 also has a boss portion 52a that protrudes from the other end side coaxially with the axis L. The fixing metal fitting 52 is fitted and fixed to the main body 11 and the biasing member 80 via the crimped portion Ri of the boss portion 52a.

[0040] The sliding contact member 70 is made of a metal such as stainless steel or phosphorus bronze, and is formed by pressing a relatively thin and elastic member. The sliding contact member 70 includes a ring-shaped fixing part 71 having an opening on the same axis as the axis L, a plurality of legs 72 connected to the outer periphery of the ring-shaped fixing part 71, extending toward one end in the direction of the axis L, and arranged on the same circumference as viewed from the direction of the axis L (eight legs 72 are arranged at equal intervals on the same circumference in this example), and a curved part 73 formed between one end side and the other end side of the legs 72 and having a convex shape with respect to the inner circumferential surface 12b of the valve seat part 12. After the boss part 22 is fitted into the opening of the sliding contact member 70, the sliding contact member 70 is joined to the valve body 20 via a welded part (not shown) by spot welding or the like. Since the curved portion 73 has a convex shape relative to the inner circumferential surface 12b of the valve seat portion 12, the curved portion 73 comes into sliding contact with the inner circumferential surface 12b of the valve seat portion 12 in approximately point contact.

[0041] <About the biasing member> The urging member 80 is composed of a two-legged leaf spring, and is formed by pressing a relatively thin and elastic member made of a metal such as stainless steel or phosphorus bronze. The urging member 80 has a substantially rectangular shape when viewed from the axis L direction (see FIG. 1(c)), a fixed portion 80b having an opening 80a on the same axis as the axis L, a pair of abutting portions 80c having a substantially rectangular shape and disposed symmetrically with respect to the axis L, and a pair of connecting portions 80d extending in a direction having an angle with respect to the axis L direction when viewed from a direction perpendicular to the axis L direction (see FIG. 1(b)) and connecting between the outside of the fixed portion 80b and the inside of the abutting portion 80c. Here, the boss portion 52a of the fixing metal fitting 52 is fitted into the opening 11o provided in the bottom portion 11u of the main body 11 and the opening 80a provided in the urging member 80, respectively, and then fitted and fixed to each other via the crimping portion Ri. This allows the biasing member 80 to be provided integrally with the valve body 10 without the need for additional members.

[0042] In this way, the pressure regulating valve 100a of the first embodiment can eliminate the conventional problem 1 (the wrong biasing member is used at the installation site) and the conventional problem 2 (restrictions on the installation direction) by integrally providing the desired biasing member 80 to the valve body 10 before shipping. In addition, by configuring the biasing member 80 from a two-legged leaf spring, it can be manufactured at a relatively low cost.

[0043] As described above, since the overall length La (see FIG. 4(a)) of the valve body 10 is determined by the adjustment screw portion 42 before shipment, even if multiple pressure regulating valves 100a are set to the same valve opening pressure setting value, there will be individual differences in the overall length La. In contrast, with the pressure regulating valve 100a of the first embodiment, a biasing member 80 capable of generating an appropriate biasing force can be selected based on the overall length La of each individual valve body 10 before shipment, and then the biasing member 80 can be integrally provided with the valve body 10, which allows for smooth removal of the valve body 10 from the fluid path.

[0044] <Variations of biasing members> Here, in the pressure regulating valve 100a of the first embodiment, the biasing member 80, which is the removal direction biasing means, is configured as a two-legged leaf spring, but is not limited thereto. As defined in the above <Terminology>, the "removal direction biasing means" is "means having a biasing force for biasing the valve body in the removal direction of the fluid path when the valve body is attached to the fluid path". Therefore, the biasing member may have any configuration as long as it has a biasing force for biasing the valve body in the removal direction of the fluid path. Here, biasing member variations 1 to 3 of the first embodiment will be specifically described, in which a three-legged leaf spring, a four-legged leaf spring, and a one-legged leaf spring are used.

[0045] <Modification 1 and Modification 2 of Urging Member of First Embodiment> The urging members 81, 82 are composed of a three-legged leaf spring and a four-legged leaf spring, as shown in Fig. 2(a) to Fig. 2(d). Specifically, the urging members 81, 82 are provided with fixed parts 81b, 82b that have a circular shape when viewed from the axis L direction (see Fig. 2(b) and Fig. 2(d)) and have openings 81a, 82a on the same axis as the axis L, three or four abutting parts 81c, 82c that have a substantially rectangular shape and are evenly arranged in the circumferential direction, and three or four connecting parts 81d, 82d that extend in a direction angled with respect to the axis L direction when viewed from a direction perpendicular to the axis L direction (see Fig. 2(a) and Fig. 2(c)) and connect between the outer side of the fixed parts 81b, 82b and the inner side of the abutting parts 81c, 82c. As a result, the biasing members 81, 82 have a greater number of abutment portions 81c, 82c that are evenly arranged in the circumferential direction than the biasing member 80, and therefore can generate a more stable biasing force without bias in the circumferential direction on the valve body 10. In addition, the biasing members 81, 82 can be manufactured at a relatively low cost.

[0046] <Modification 3 of the biasing member of the first embodiment> As shown in Fig. 2(e) and Fig. 2(f), the urging member 83 is composed of a one-legged leaf spring, and has a substantially rectangular shape when viewed from the axis L direction (see Fig. 2(f)), a fixed portion 83b having an opening 83a coaxially with the axis L, and a contact portion 83c having a convex shape at one end when viewed from a direction perpendicular to the axis L direction (see Fig. 2(e)), and a connecting portion 83d connecting the outer sides of the fixed portion 83b and the contact portion 83c with a curve. As a result, the urging member 83 can relatively easily increase the amount of bending from the natural length state to the deformed state, that is, the urging force on the valve body 10 can be relatively large, compared to the urging member 80. Moreover, the urging member 83 can be manufactured at a relatively low cost.

[0047] <Installation and removal of pressure regulating valve> From here, the shapes of the main body 11, the piping block B, and the connector C of the pressure regulating valve 100a including the biasing member 80 of the first embodiment will be described with reference to FIG.

[0048] The main body 11 is formed with a large diameter portion 11L and a small diameter portion 11S whose outer diameter gradually decreases from the open end 11d toward the bottom portion 11u along the direction of the axis L. Here, a constricted portion 11n that is continuously connected between the large diameter portion 11L and the small diameter portion 11S is formed.

[0049] The piping block B has an insertion hole along the axis L direction, and a first housing groove G1 (opening) and an annular groove Ga are formed on one end side of the insertion hole. The inner diameter of the first housing groove G1 is set to be slightly larger than the outer diameter of the large diameter portion 11L of the main body 11. A secondary side flow path Fp2 formed in a direction perpendicular to the axis L direction is connected to the annular groove Ga. In addition, a second housing groove G2 is formed in the insertion hole along the axis L direction, the diameter of which is reduced stepwise from the annular groove Ga to the other end side. The inner diameter of the second housing groove G2 is set to be slightly larger than the outer diameter of the small diameter portion 11S of the main body 11, and a pressure equalizing path Ep is formed. Furthermore, an annular seal groove Gs is formed on the other end side of the first housing groove G1, in which a first O-ring Or1 (seal member) is accommodated. Furthermore, a screw hole Sh is formed in one end face Bs of the piping block B. In this manner, in the piping block B, an accommodation space As (fluid path) capable of accommodating the valve body 10 is formed along the axial line L direction.

[0050] The connector C (fixing means) holds the valve body 10 in the axial direction L in the fluid path, has a shape corresponding to the opening of the fluid path, and has a flange Cf that protrudes radially outward from one end side to the other end side, an insertion part Ci that is inserted into an insertion hole of the piping block B, and an abutment surface Cc formed on the other end side of the insertion part Ci. The flange Cf has a mounting hole Ch. Although details will be described later, a fastening screw Sw (see FIG. 4) is inserted into the mounting hole Ch. In addition, a connector annular seal groove Cg in which a second O-ring Or2 is accommodated is formed on the outer circumferential surface of the insertion part Ci. Furthermore, the connector C has a primary side flow path Fp1 that is coaxial with the axial line L. Note that the connector C in the first embodiment has a shape corresponding to the opening of the fluid path, but is not limited thereto. For example, the connector C may have any shape that holds the valve body 10 in the axial direction L in the fluid path, such as a C-shaped ring that is provided in an inner circumferential groove of the fluid path and generates an elastic force in the radial direction.

[0051] <Installation and removal operations> 3 and 4, the operation of mounting and removing the pressure regulating valve 100a to and from the piping block B will be described. Note that (1) to (4) shown below correspond to the reference characters added to FIG.

[0052] <About installation> (1) The pressure regulating valve 100a is moved to the other end side in the axial direction L (upward in FIG. 3) and inserted into the first accommodation groove G1 (opening) of the piping block B. Then, the biasing member 80 is moved to the other end side in the axial direction L until the contact portion 80c of the biasing member 80 contacts the bottom surface Gb at the other end side of the accommodation space As. At this time, the first O-ring Or1 disposed in the annular seal groove Gs is not in contact with the large diameter portion 11L of the main body 11 and is in an uncompressed state. As a result, the deformation amount L1 of the biasing member 80 can be set to be larger than the seal member sliding distance L2 (see FIGS. 4(a) and (b)), which will be described in detail later.

[0053] (2) The connector C is moved to the other end side in the axial direction L (upward in FIG. 3) and inserted into the first accommodation groove G1 (opening) of the piping block B, and the abutment surface Cc of the connector C is abutted against the open end 12d of the valve seat portion 12, which is one end of the valve body 10. Then, as shown in FIG. 4, while the fastening screw Sw is screwed into the threaded hole Sh of the piping block B through the mounting hole Ch of the connector C, the connector C is moved to the other end side in the axial direction L until the flange Cf of the connector C abuts against one end surface Bs of the piping block B. As a result, the pressure regulating valve 100a is inserted into the accommodation space As (fluid path) of the piping block B.

[0054] At this time, while being pressed by the connector C, the valve body 10 moves toward the other end side in the axial line L direction, and the connecting portion 80d of the urging member 80 is bent relatively toward one end side by a deformation amount L1 in the axial line L direction with the abutting portion 80c of the urging member 80 abutting against the bottom surface Gb of the accommodation space As (deflection from the natural length state shown by the dashed line in FIG. 4 to the deformed state shown by the solid line). Also, as shown in FIG. 4(b), the first O-ring Or1 is slid and clamped in a compressed state between the annular seal groove Gs and the large diameter portion 11L of the body 11 by a distance (hereinafter referred to as the "sealing member sliding distance") L2, and seals the gap between the valve body 10 and the piping block B. Here, the deformation amount L1 of the urging member 80 is set to be larger than the sealing member sliding distance L2 (L1>L2).

[0055] 4(a), the biasing force FB of the biasing member 80 is set to be larger than the force FD that the valve body 10 receives from the fluid pressure in the attached state (FB>FD). The force FD that the valve body 10 receives from the fluid pressure is the product of the differential pressure that one end side and the other end side of the valve body 10 receive and the cross-sectional area of ​​the valve body 10 when the pressure regulating valve 100a is in the valve closed state ((P1-P2)×(D / 2) 2 ×π, P1: primary pressure, P2: secondary pressure, D: maximum diameter of the valve body 10). Here, a pressure equalizing path Ep is formed in the gap between the small diameter portion 11S of the body 11 and the second accommodation groove G2, which constantly fluidically connects the accommodation space As defined on the other end side of the valve body 10 and the secondary flow path Fp2, so that in the valve closed state, the secondary pressure P2 is introduced to the other end side of the valve body 10. Also, one end side of the valve body 10, that is, the open end 12d of the valve seat portion 12 and the abutment surface Cc of the connector C are in abutment state, but microscopically, a fluid has entered. Therefore, in the valve closed state, the primary pressure P1 is introduced to the one end side of the valve body 10. As a result, in the attached state, the biasing force FB of the biasing member 80 is always larger than the force FD received from the fluid pressure, so that the valve body 10 can always maintain a state in which it abuts against the connector. As a result, it is possible to reliably prevent the valve body 10 from moving in the mounting direction (upward in FIG. 4(a)) due to fluid pressure, and the connecting portion 80d of the biasing member 80 from being damaged due to excessive deformation.

[0056] <About the removal operation> (3) The fastening screw Sw shown in FIG. 4 is removed from the threaded hole Sh of the piping block B, and the connector C is moved to one end side in the direction of the axis L (downward in FIG. 3).

[0057] (4) At the same time as the operation of (3), the valve body 10 automatically moves to one end side in the axial L direction (downward in FIG. 3) due to the biasing force FB of the biasing member 80 in the removal direction. Here, as described above, the deformation amount L1 of the biasing member 80 is set to be larger than the seal member sliding distance L2 (L1>L2). Therefore, the valve body 10 moves a distance equivalent to the deformation amount L1 of the biasing member 80 due to the restoring force of the biasing member 80 from the deformed state to the natural length state. As a result, in the removal operation, the valve body 10 moves a distance equivalent to the deformation amount L1 of the biasing member 80, which is larger than the seal member sliding distance L2, so that the valve body 10 can be reliably moved to a state in which the sliding resistance of the first O-ring Or1 is not loaded against the valve body 10.

[0058] In this way, in the pressure regulating valve 100a of the first embodiment, the desired urging member 80 has a urging force that urges the valve body 10 in the direction of removal from the fluid path when the valve body 10 is attached to the fluid path, thereby eliminating the conventional problem 3 (difficult to remove due to small urging force) and the conventional problem 4 (difficult to remove due to tilted urging force). As a result, in the first embodiment, the pressure regulating valve 100a can be smoothly attached to and removed from the fluid path.

[0059] <Operation of the pressure regulating valve> Here, the operation of the pressure regulating valve 100a will be described with reference to Fig. 4. Here, in the pressure regulating valve 100a, a high primary pressure P1 is introduced to the primary port 1A, and a low secondary pressure P2 is introduced to the secondary port 1B. Here, the multiple curved parts 73 of the sliding contact member 70 are pressed by the radially outward elastic force of the multiple leg parts 72, and therefore have sliding resistance against the inner circumferential surface 12b of the valve seat portion 12.

[0060] 4, when the pressure regulating valve 100a is in the valve closed state, when the pressure at the primary side port 1A increases, a valve opening force due to the pressure difference acts on the valve element 20. However, until this valve opening force exceeds the combined force of the biasing forces of the pressure-sensing bellows 51 and the valve spring 41 and the sliding resistance at the curved portion 73 of the sliding contact member 70, the valve element 20 does not leave the valve seat 12a.

[0061] Next, when the pressure regulating valve 100a is in an open state (not shown), if the pressure at the primary side port 1A increases further and the valve opening force acting on the valve element 20 exceeds the combined force of the biasing forces of the pressure-sensing bellows 51 and the valve spring 41 and the sliding resistance at the curved portion 73 of the sliding member 70, the valve element 20 leaves the valve seat 12a and fluid flows from the primary side port 1A to the secondary side port 1B (see the flow indicated by the dashed line in Figure 4(a)).

[0062] Furthermore, when the pressure at the primary side port 1A decreases, the valve opening force acting on the valve body 20 falls below the combined force of the biasing forces of the pressure-sensing bellows 51 and the valve spring 41 and the sliding resistance at the curved portion 73 of the sliding contact member 70, and the valve body 20 again seats on the valve seat 12a.

[0063] As described above, the pressure regulating valve 100a of the first embodiment can eliminate the conventional problem 1 (the wrong urging member is used at the installation site) and the conventional problem 2 (restriction on the installation direction) by integrally providing the desired urging member 80 to the valve body 10 before shipping. Furthermore, in the pressure regulating valve 100a of the first embodiment, the desired urging member 80 has a urging force that urges the valve body 10 in the removal direction of the fluid path when the valve body 10 is installed in the fluid path, thereby eliminating the conventional problem 3 (difficult to remove due to small urging force) and the conventional problem 4 (difficult to remove due to tilted urging force). As a result, in the first embodiment, the installation work and removal work of the pressure regulating valve 100a to the fluid path can be performed smoothly. Furthermore, by setting the urging force FB of the urging member 80 to be larger than the force FD that the valve body 10 receives from the fluid pressure (FB>FD), it is possible to reliably prevent the urging member 80 from being damaged due to excessive deformation. In addition, by setting the deformation amount L1 of the biasing member 80 to be greater than the sealing member sliding distance L2 (L1>L2), the valve body 10 can be reliably moved to a state in which the sliding resistance of the first O-ring Or1 is not loaded against the valve body 10 during the removal operation.

[0064] In the first embodiment, the storage space As is described as opening vertically downward, but the present invention is not limited thereto, and may be opened horizontally to the side or vertically upward. When the storage space As is opened vertically upward, the pressure adjusting valve 100a can be made to generate an appropriate biasing force in the biasing member 80 by taking into account the increase in its own weight, thereby allowing the removal operation to be performed smoothly.

[0065] (Modification of the pressure equalizing path of the first embodiment) A pressure regulating valve 100b in a pressure equalizing passage modification of the first embodiment will be described with reference to Fig. 5. The pressure regulating valve 100b in the pressure equalizing passage modification of the first embodiment differs from the pressure regulating valve 100a in the first embodiment in that a pressure equalizing passage 11ep is formed in the bottom 11u of the main body 11B, but the other configurations are the same as those of the first embodiment. Here, the same components are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0066] <Regarding concerns (difficulty in mounting and removing due to narrow pressure equalization path)> Here, with reference to FIG. 3, a concern that arises when the pressure regulating valve 100a of the first embodiment has a pressure equalizing passage Ep with a relatively narrow flow passage area will be described.

[0067] In the gap between the small diameter portion 11S of the main body 11 and the second accommodating groove G2, a pressure equalizing path Ep is formed, which constantly fluidly connects the accommodating space As defined between the other end side of the valve main body 10 and the fluid path, and the secondary flow path Fp2. If the flow path area of ​​this pressure equalizing path Ep is relatively narrow, positive and negative pressures are generated in the accommodating space As during the installation and removal of the pressure regulating valve 100a from the piping block B, which acts like an air suspension, and there has been concern that the installation and removal operations may not be performed smoothly (hereinafter referred to as "concern (difficulty in installation and removal due to narrow pressure equalizing path)").

[0068] <About pressure equalizing lines> In contrast, in the pressure regulating valve 100b in the pressure equalizing passage modification of the first embodiment, as shown in Fig. 5, a pressure equalizing passage 11ep, which is a through hole extending in the axial direction L, is provided in the bottom 11u of the body 11 in order to equalize the pressure in the accommodation space As defined between the other end side of the body 11 and the fluid path. This pressure equalizing passage 11ep has a relatively larger flow passage area than the pressure equalizing passage Ep formed in the gap between the small diameter portion 11S of the body 11 and the second accommodation groove G2. As a result, when the pressure regulating valve 100b is mounted on the piping block B and removed, atmospheric pressure is constantly introduced into the accommodation space As via the pressure equalizing passage 11ep, eliminating the concern (difficulty in mounting and removing due to a narrow pressure equalizing passage) and allowing the mounting and removing operations to be performed reliably and smoothly.

[0069] In the pressure regulating valve 100b in the pressure equalizing passage modification of the first embodiment, the pressure equalizing passage 11ep that equalizes the pressure of the accommodating space As defined between the other end side of the main body 11 and the fluid path has been described as a through hole provided in the bottom 11u of the main body 11B. However, the present invention is not limited to this. For example, the pressure equalizing passage that equalizes the pressure of this accommodating space As may be a recess extending in the axial direction L on the outer circumferential surface of the small diameter portion 11S facing the second accommodating groove G2, as shown in FIG. 5, to increase the flow path area of ​​the pressure equalizing passage Ep.

[0070] As described above, in the pressure regulating valve 100b in the pressure equalizing path modification of the first embodiment, similarly to the first embodiment, it is possible to solve the conventional problem 1 (the wrong biasing member is used at the installation site) to the conventional problem 4 (difficulty in removal due to tilted biasing force). Also, in the pressure regulating valve 100b in the pressure equalizing path modification of the first embodiment, similarly to the first embodiment, the biasing force of the biasing member 80 is set to be larger than the force that the valve body 10B receives from the fluid pressure, and the deformation amount of the biasing member 80 is set to be larger than the seal member sliding distance, thereby reliably preventing damage to the biasing member 80 and reliably moving the valve body 10B to a position that is not affected by the first O-ring Or1 during removal operation. Furthermore, in the pressure regulating valve 100b in the pressure equalizing path variant of the first embodiment, during installation and removal operations, atmospheric pressure is constantly introduced into the storage space As through the pressure equalizing path 11ep formed in the bottom 11u of the main body 11B, eliminating the concern (difficulty in installation and removal operations due to a narrow pressure equalizing path) and ensuring smooth installation and removal operations.

[0071] (Modification of the position adjustment joint of the first embodiment) A pressure regulating valve 100c in a modified position adjusting joint of the first embodiment will be described with reference to Fig. 6. The pressure regulating valve 100c in the modified position adjusting joint of the first embodiment is different from the pressure regulating valve 100a of the first embodiment in that the welded part WC (joint) formed between the valve seat part 12C and the main body 11C is formed on the other end side of the open end 12Cd (pressing part) of the valve seat part 12C, but the other configurations are the same as those of the first embodiment. Here, the same components are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0072] <Regarding the concern (the pressure control valve is tilted due to the welded joint, making it difficult to remove the valve)> Here, with reference to FIG. 4, a concern that arises when the pressure regulating valve 100a of the first embodiment has an inclination with respect to the axis L direction due to the welded portion W will be described.

[0073] At one end of the valve seat portion 12 and the main body 11, a welded portion W for fixing them to each other is continuously formed in the circumferential direction. This welded portion W does not have the same height in the axial direction L along the circumferential direction, but has a non-uniform height in the axial direction L. Therefore, in the mounting operation of the pressure regulating valve 100a to the piping block B, the abutment surface Cc of the connector C does not abut against the open end 12d of the valve seat portion 12, but abuts against the welded portion W having a non-uniform height in the axial direction L along the circumferential direction, and the valve main body 10 may be mounted in a tilted state with respect to the axis L. As a result, galling occurs between the outer peripheral surface of the valve main body 10 and the first housing groove G1 and the second housing groove G2, and there is a concern that the removal operation cannot be performed smoothly (hereinafter, referred to as "concern (difficulty in removing the pressure regulating valve due to the tilt of the welded portion)").

[0074] <About joints> In contrast, in the pressure regulating valve 100c in the position adjustment joint modification of the first embodiment, as shown in Fig. 6, the welded part WC (jointed part) formed between the open end 11Cd of the main body 11C and one end side of the valve seat part 12C is formed on the other end side of the open end 12Cd (pressing part) of the valve seat part 12C pressed by the connector C (fixing means). As a result, in the mounting operation of the pressure regulating valve 100c to the piping block B, the valve main body 10C is mounted along the axis L after the abutment surface Cc of the connector C is surely abutted against the open end 12Cd of the valve seat part 12, so that the concern (the pressure regulating valve being tilted due to the welded part, making it difficult to remove) is eliminated, and the mounting and removal operations can be performed surely and smoothly.

[0075] As described above, in the pressure regulating valve 100c in the position adjustment joint modification of the first embodiment, similarly to the first embodiment, the conventional problem 1 (incorrect biasing member used at the installation site) to conventional problem 4 (difficult to remove due to tilted biasing force) can be eliminated. Also, in the pressure regulating valve 100c in the position adjustment joint modification of the first embodiment, similarly to the first embodiment, the biasing force of the biasing member 80 is set to be greater than the force that the valve body 10C receives from the fluid pressure, and the deformation amount of the biasing member 80 is set to be greater than the seal member sliding distance, thereby reliably preventing damage to the biasing member 80 and reliably moving the valve body 10C to a position that is not affected by the first O-ring Or1 during removal operation. Furthermore, in the pressure regulating valve 100c in the modified position adjustment joint of the first embodiment, the abutment surface Cc of the connector C securely abuts against the open end 12Cd of the valve seat portion 12C, eliminating a concern (such as the inclination of the pressure regulating valve caused by the welded joint making the removal operation difficult) and ensuring smooth installation and removal operations.

[0076] (Modification of the seal member of the first embodiment) A pressure regulating valve 100d in a modified seal member of the first embodiment will be described with reference to Fig. 7. The pressure regulating valve 100d in the modified seal member of the first embodiment differs from the pressure regulating valve 100a in the first embodiment in that the welded portion WD (joint portion) of the adjusting screw portion 42 is provided on the side surface and the valve seat portion 12D has a seal member, but the other configurations are substantially the same as those of the first embodiment. Here, the same components are denoted by the same reference numerals and duplicated explanations will be omitted.

[0077] First, in the seal member modification of the first embodiment, the position where the welded portion WD (joint portion) of the adjustment screw portion 42 is provided is the middle portion of the valve seat portion 12D and the radially outer side of the open end 11Dd of the main body 11D. Also, in the seal member modification of the first embodiment, the piping block Bd differs from the piping block B of the first embodiment only in that an accommodating groove with a larger inner diameter is added to one end side of the first accommodating groove G1, and the first to third numbers of each accommodating groove are reassigned in order from one end side to the other end side.

[0078] <Regarding the concern (difficulty in removing the container due to the tilt of the pressure adjustment valve caused by the sealing material)> Here, with reference to FIG. 3, a concern that arises when the pressure regulating valve 100a of the first embodiment has an inclination with respect to the axis L direction due to the seal member will be described.

[0079] In the first embodiment, the gap between the pressure regulating valve 100a and the piping block B is sealed by clamping the first O-ring Or1 (sealing member) between the large diameter portion 11L of the main body 11 and the annular seal groove Gs during the installation operation of the pressure regulating valve 100a to the piping block B. At this time, it was necessary to first accommodate the first O-ring Or1 in the annular seal groove Gs, insert a relatively long distance corresponding to the biasing member 80 and the small diameter portion 11S of the main body 11 inside the first O-ring Or1, and then clamp the first O-ring Or1. Therefore, before the first O-ring Or1 is pressed against the large diameter portion 11L of the main body 11 and becomes sealed, the first O-ring Or1 may come off the annular seal groove Gs due to sliding with the biasing member 80 and the small diameter portion 11S of the main body 11, and the valve main body 10 may be installed in a state inclined with respect to the axis L. As a result, there was concern that scuffing would occur between the outer peripheral surface of the valve body 10 and the first accommodating groove G1 and the second accommodating groove G2, making it difficult to perform the removal operation (hereinafter referred to as "Concern (difficulty in removing the valve due to tilt of the pressure regulating valve caused by the sealing member)").

[0080] <About sealing materials> In contrast, in the pressure regulating valve 100d in the seal member modification of the first embodiment, as shown in Fig. 7(a), the valve seat portion 12D further includes a flange portion 12Df (see Fig. 7(b)) provided on one end side and a valve seat portion annular seal groove 12De provided on the outer circumferential surface of the flange portion 12Df. A first O-ring Or1 having an outer diameter larger than that of the flange portion 12Df is accommodated in the valve seat portion annular seal groove 12De.

[0081] Here, in the first embodiment and the modified sealing member of the first embodiment, during the installation operation of the pressure regulating valves 100a, 100d to the piping blocks B, Bd, we consider the possibility that the first O-rings Or1 of each will come into contact with other components before compression begins.

[0082] First, as described above, in the first O-ring Or1 in the first embodiment, the biasing member 80 and the small diameter portion 11S of the main body 11 pass near the inner periphery of the first O-ring Or1 before compression starts. In contrast, in the first O-ring Or1 in the seal member modification of the first embodiment, the first housing groove G1 passes near the outer periphery of the first O-ring Or1 before compression starts. Therefore, the first O-ring Or1 in the seal member modification of the first embodiment has a very short distance that other members pass near it compared to the first O-ring Or1 in the first embodiment, that is, the possibility of contact is very small, so that the concern (the inclination of the pressure regulating valve caused by the seal member making it difficult to remove the valve) is eliminated, and the installation and removal operations can be performed reliably and smoothly.

[0083] <Installation and removal operations> In the mounting operation of the pressure regulating valve 100d to the piping block Bd, the pressure regulating valve 100d is inserted from one end side of the first accommodation groove G1 along the axis L direction of the piping block Bd, and then the valve body 10D moves toward the other end side in the axis L direction while being pressed by the connector C, so that the biasing member 80 abuts against the bottom surface Gb of the accommodation space As and is relatively deflected toward the one end side. Here, the deformation amount L1' (see FIG. 7(a)) of the biasing member 80 is set to be larger than the seal member sliding distance L2' (see FIG. 7(b)) of the first O-ring Or1 (L1'>L2') as in the first embodiment. As a result, in the removal operation, the valve body 10D moves a distance equivalent to the deformation amount L1' of the biasing member 80, which is larger than the seal member sliding distance L2', so that the valve body 10D can be reliably moved to a state in which the sliding resistance of the first O-ring Or1 is not loaded against the valve body 10D.

[0084] Furthermore, the biasing force FB' (see FIG. 7(a)) of the biasing member 80 is set to be larger than the force FD' (see FIG. 7(a)) that the valve body 10D receives from the fluid pressure in the attached state (FB'>FD'), as in the first embodiment. Note that the force FD' that the valve body 10D receives from the fluid pressure is the product ((P1-P2)×(D' / 2) of the differential pressure that one end side and the other end side of the valve body 10D receive and the cross-sectional area of ​​the valve body 10D when the pressure regulating valve 100d is in the valve closed state. 2 7(a) and 7(b) are the primary pressure, secondary pressure, and D', respectively. In the attached state, the biasing force FB' of the biasing member 80 is always greater than the force FD' received from the fluid pressure, so that the valve body 10D can always be maintained in contact with the connector C. As a result, the valve body 10D can be reliably prevented from moving in the attachment direction (upward in FIG. 7(a)) due to the fluid pressure, and the connecting portion 80d of the biasing member 80 can be reliably prevented from being damaged due to excessive deformation.

[0085] As described above, in the pressure regulating valve 100d in the seal member modification of the first embodiment, similarly to the first embodiment, the conventional problem 1 (the wrong biasing member is used at the installation work site) to the conventional problem 4 (difficult to remove due to tilted biasing force) can be eliminated. Also, in the pressure regulating valve 100d in the seal member modification of the first embodiment, similarly to the first embodiment, the biasing force FB' of the biasing member 80 is set to be larger than the force FD' that the valve body 10D receives from the fluid pressure (FB'>FD'), and the deformation amount L1' of the biasing member 80 is set to be larger than the seal member sliding distance L2' (L1'>L2'), thereby reliably preventing damage to the biasing member 80 and reliably moving the valve body 10D to a position where it is not affected by the first O-ring Or1 in the removal operation. Furthermore, in the pressure regulating valve 100d in the seal member modification of the first embodiment, the welded portion WD is disposed on the side of the valve seat portion 12D, and the abutment surface Cc of the connector C is surely abutted against the open end 12Dd (pressing portion) of the valve seat portion 12, eliminating the concern (difficulty in removal operation due to tilt of the pressure regulating valve caused by the welded portion) and allowing the installation and removal operations to be performed reliably and smoothly. In addition, in the pressure regulating valve 100d in the seal member modification of the first embodiment, the valve seat portion 12D has the first O-ring Or1 (seal member), which greatly reduces the possibility of the first O-ring Or1 coming into contact with other members, eliminating the concern (difficulty in removal operation due to tilt of the pressure regulating valve caused by the seal member) and allowing the installation and removal operations to be performed reliably and smoothly.

[0086] (Stopper portion modification 1 of the first embodiment) The pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment will be described with reference to FIG. 8. The pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment differs from the pressure regulating valve 100a in the first embodiment in that the main body 11 has a stopper portion 11st, but the other configurations are the same as those of the first embodiment. Here, the same configurations are given the same symbols, and duplicated explanations are omitted. In the stopper portion modification 1 of the first embodiment, the piping block Be is only different from the piping block B in the first embodiment in that a third accommodating groove G3, which has a small inner diameter and can accommodate the biasing member 80E, is added to the other end side of the second accommodating groove G2.

[0087] <Regarding concerns (difficulty in installation due to large spring constant of biasing member) and concerns (difficulty in managing deformation of biasing member due to individual differences in overall length of valve body)> Here, with reference to FIG. 3, concerns arising from the large spring constant of the biasing member 80 and individual differences in the overall length La of the valve body 10 in the pressure regulating valve 100a of the first embodiment will be described.

[0088] In the pressure regulating valve 100a of the first embodiment, [1] the biasing force FB of the biasing member 80 is set to be larger than the force FD that the valve body 10 receives from the fluid pressure in the attached state (FB>FD), and [2] the deformation amount L1 of the biasing member 80 is set to be larger than the seal member sliding distance L2 of the first O-ring Or1 (L1>L2). That is, the biasing member 80 of the first embodiment has two functions, that is, [1] a support function to prevent fluctuation due to fluid pressure, and [2] a moving function to ensure smooth movement during removal operation, in one member. For this reason, depending on the use conditions of the pressure regulating valve 100a, it is necessary to make the spring constant of the biasing member 80 relatively large, and accordingly, a relatively large pressing force is required for the connector C, which may make the installation operation difficult (hereinafter referred to as "concern (installation operation is difficult due to large spring constant of the biasing member)"). In addition, since the overall length La of the valve body 10 in the axial L direction varies from one valve body to another, it may be difficult to control the deformation amount L1 of the biasing member 80 during installation depending on the insertion amount of the connector C (hereinafter referred to as "concern (difficulty in controlling the deformation amount of the biasing member due to individual differences in the overall length of the valve body)").

[0089] <About the stopper part> 8, first, in the piping block Be, an annular step portion St is formed between the second accommodating groove G2 and the third accommodating groove G3. In addition, in the pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment, a stopper portion 11st that abuts against the annular step portion St is formed on the bottom portion 11u of the main body 11. Here, in the mounting operation of the pressure regulating valve 100e to the piping block Be, before the flange Cf of the connector C abuts against the one end face Bs of the piping block Be, the stopper portion 11st of the main body 11 abuts against the annular step portion St of the piping block Be. Therefore, a gap Gp is ​​formed between the flange Cf and the one end face Bs. As a result, in the stopper portion modification 1 of the first embodiment, [1] the stopper portion 11st has a support function to prevent fluctuation due to fluid pressure, while [2] the urging member 80E (removal direction urging means) has only a moving function to ensure smooth movement during removal, thereby eliminating the concern (difficulty in mounting due to large spring constant of the urging member). Also, in the stopper portion modification 1 of the first embodiment, the amount of deformation of the urging member 80E is regulated by the stopper portion 11st of the main body 11 abutting against the annular step portion St of the piping block Be, thereby eliminating the concern (difficulty in managing the amount of deformation of the urging member due to individual differences in the overall length of the valve main body).

[0090] As described above, in the pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment, similar to the first embodiment, the conventional problem 1 (incorrect biasing member is used at the installation work site) to conventional problem 4 (difficulty in removal due to tilted biasing force) can be eliminated. In addition, in the pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment, similar to the first embodiment, the deformation amount of the biasing member 80 is set to be larger than the seal member sliding distance, so that the valve body 10E can be reliably moved to a position not affected by the first O-ring Or1 during removal operation. Furthermore, in the pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment, [1] the stopper portion 11st has a support function for preventing fluctuation due to fluid pressure, while [2] the biasing member 80E has only a moving function for ensuring smooth movement during removal operation, so that the concern (difficulty in installation operation due to large spring constant of the biasing member) can be eliminated. In addition, in the pressure regulating valve 100e in the stopper portion variant 1 of the first embodiment, the amount of deformation of the biasing member 80E is regulated by the stopper portion 11st of the main body 11 abutting against the annular step portion St of the piping block Be, thereby eliminating the concern (difficulty in controlling the amount of deformation of the biasing member due to individual differences in the overall length of the valve body).

[0091] (Modification 2 of the stopper portion of the first embodiment) The pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment will be described with reference to FIG. 9. The pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment has a stopper member 14F separate from the main body 11 and differs from the pressure regulating valve 100e in the stopper portion modification 1 of the first embodiment in that it employs an urging member 81, but the other configurations are the same as those in the stopper portion modification 1 of the first embodiment. Here, the same configurations are given the same reference numerals, and duplicated descriptions are omitted. In addition, the urging member 81 in the stopper portion modification 2 of the first embodiment is the same as that described with reference to FIGS. 2(a) and (b), and therefore a description thereof is omitted. Furthermore, the piping block Bf in the stopper portion modification 2 of the first embodiment has the same configuration as the piping block B in the first embodiment, and therefore a description thereof is omitted.

[0092] In the stopper portion variant 1 of the first embodiment, as shown in FIG. 8, it is necessary to form an annular step portion St so that the other end side of the accommodating space As of the piping block Be abuts against the stopper portion 11st of the main body 11. Therefore, it was desired to reduce the processing costs of the piping block Be.

[0093] <About the stopper material> In contrast, as shown in Fig. 9, the pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment has a stopper member 14F (stopper portion) separate from the main body 11. The stopper member 14F is made of a metal such as stainless steel or phosphorus bronze, and is formed by pressing a relatively thick and rigid member. The stopper member 14F has a tripod and includes a fixed portion 14Fb having a circular shape when viewed from the axis L direction (see Fig. 9(c)) and an opening 14Fa on the same axis as the axis L, three abutment portions 14Fc that are evenly arranged in the circumferential direction and stand on the other end side in the axis L direction, and three spoke portions 14Fs that extend in the radial direction when viewed from a direction perpendicular to the axis L direction (see Fig. 9(b)) and connect between the outside of the fixed portion 14Fb and the inside of the abutment portion 14Fc. Here, the boss portion 52Fa of the fixing metal fitting 52F is fitted into the opening 11o provided in the bottom portion 11u of the main body 11, the opening 14Fa provided in the stopper member 14F, and the opening 81a provided in the urging member 81 in that order, and then fitted and fixed to each other via the crimping portion Ri. As a result, the stopper member 14F and the urging member 81 can be integrally provided on the main body 11 without requiring any additional members. Here, the deformation amount of the urging member 81 is regulated by the abutment portion 14Fc of the stopper member 14F abutting against the bottom surface Gb of the piping block Bf. The valve main body 10F is composed of the main body 11, the valve seat portion 12 (not shown), and the stopper member 14F, which are each integrally formed. This stopper member 14F can be manufactured at a relatively low cost.

[0094] As described above, in the pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment, similarly to the stopper portion modification 1 of the first embodiment, the conventional problem 1 (incorrect biasing member is used at the installation work site) to conventional problem 4 (difficulty in removal due to tilted biasing force) can be eliminated. In addition, in the pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment, similarly to the first embodiment, the deformation amount of the biasing member 81 is set to be larger than the seal member sliding distance, so that the valve body 10F can be reliably moved to a position not affected by the first O-ring Or1 in the removal operation. Furthermore, in the pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment, the deformation amount of the biasing member 81 is restricted by the abutment portion 14Fc of the stopper member 14F abutting against the bottom surface Gb of the piping block Bf, so that the concerns (difficulty in installation due to large spring constant of the biasing member) and the concerns (difficulty in managing the deformation amount of the biasing member due to individual differences in the overall length of the valve body) can be eliminated. Additionally, in the pressure regulating valve 100f in the stopper portion modification 2 of the first embodiment, the stopper member 14F can be manufactured at a relatively low cost, and the processing cost of the piping block Bf can be suppressed.

[0095] (Third modified example of the stopper portion of the first embodiment) The pressure regulating valve 100g in the stopper portion modified example 3 of the first embodiment will be described with reference to FIG. 10. The pressure regulating valve 100g in the stopper portion modified example 3 of the first embodiment differs from the pressure regulating valve 100f in the stopper portion modified example 2 of the first embodiment in that it has a stopper member 14G and an urging unit 80G, but the other configurations are the same as those of the stopper portion modified example 2 of the first embodiment. Here, the same configurations are given the same reference numerals, and duplicated explanations will be omitted. Also, the piping block Bg in the stopper portion modified example 3 of the first embodiment has the same configuration as the piping block B in the first embodiment, so explanations will be omitted.

[0096] Since the biasing member 81 in the stopper portion modification 2 of the first embodiment is composed of a tripod leaf spring, it is not easy to set the spring constant to be relatively large. However, there has been a demand for a relatively large spring constant for the biasing member 81 in order to remove the pressure regulating valve 100f from the accommodation space As with a smoother movement.

[0097] <Regarding the stopper member and the biasing unit> In contrast, as shown in FIG. 10, a pressure regulating valve 100g in the third modified stopper portion of the first embodiment includes a stopper member 14G and a biasing unit 80G.

[0098] First, the urging unit 80G (removal direction urging means) has a substantially cylindrical shape, and includes a contact member 80Ga having a spring support portion 80Gae with an expanded diameter near the center, and a urging member 80Gb made of a compression coil spring.

[0099] Next, the stopper member 14G (stopper portion) is made of a metal such as stainless steel or phosphorus bronze, and has a generally cylindrical shape with a bottom, and includes a cylindrical side wall portion 14Ge, a ring-shaped fixing portion 14Gb provided at one end of the side wall portion 14Ge, a throttle portion 14Gg provided at the other end of the side wall portion 14Ge, a contact portion 14Gc provided at the other end of the throttle portion 14Gg, and an opening 14Gf provided inside the throttle portion 14Gg and coaxial with the axis L.

[0100] The urging unit 80G is accommodated in the stopper member 14G with one end of the urging member 80Gb abutting against the bottom 11u of the main body 11 and the other end of the urging member 80Gb abutting against the spring support portion 80Gae, and then the fixing portion 14Gb is fixed to the bottom 11u of the main body 11 via the welded portion W. In this way, the urging unit 80G and the stopper member 14G are integrally provided to the main body 11. At this time, the inner peripheral portion of the other end side of the urging member 80Gb is supported by the outer peripheral surface of one end side of the abutment member 80Ga, so that the urging member 80Gb is disposed in a state in which bending or falling in the axis L direction is suppressed. In addition, in the biasing unit 80G before the pressure regulating valve 100g is attached to the piping block Bg, the spring support portion 80Gae of the contact member 80Ga is pressed toward the other end side in the axial direction L by the biasing member 80Gb, and one end side of the contact member 80Ga (including the contact portion 80Gac) protrudes outward from the opening 14Gf of the stopper member 14G. At this time, the spring support portion 80Gae of the contact member 80Ga is held in a state of abutting against the narrowing portion 14Gg of the stopper member 14G that functions as a retainer.

[0101] In the mounting operation of the pressure regulating valve 100g to the piping block Bg, the valve body 10G is inserted into the first accommodation groove G1 (opening) of the piping block Bg and moved to the other end side in the axial direction (upward in FIG. 10), so that the abutment portion 80Gac of the abutment member 80Ga first abuts against the bottom surface Gb of the accommodation space As. When the valve body 10G is further moved toward the other end side in the axial direction L, the biasing member 80Gb deforms and contracts in the axial direction L, so that the abutment portion 14Gc of the stopper member 14G abuts against the bottom surface Gb of the accommodation space As. Therefore, the deformation amount of the biasing member 80Gb is regulated by the abutment of the abutment portion 14Gc of the stopper member 14G with the bottom surface Gb of the piping block Bg. As a result, in the stopper portion modification 3 of the first embodiment, a compression coil spring can be used as the biasing member 80Gb, and the spring constant can be set relatively easily to a large value as necessary.

[0102] As described above, in the pressure regulating valve 100g in the stopper portion modification 3 of the first embodiment, similarly to the stopper portion modification 2 of the first embodiment, the conventional problem 1 (incorrect biasing member is used at the installation work site) to conventional problem 4 (difficulty in removal due to tilted biasing force) can be eliminated. In addition, in the pressure regulating valve 100g in the stopper portion modification 3 of the first embodiment, similarly to the first embodiment, the deformation amount of the biasing unit 80G is set to be larger than the seal member sliding distance, so that the valve body 10G can be reliably moved to a position not affected by the first O-ring Or1 in the removal operation. Furthermore, in the pressure regulating valve 100g in the stopper portion modification 3 of the first embodiment, the deformation amount of the biasing member 80Gb is restricted by the abutment portion 14Gc of the stopper member 14G abutting against the bottom surface Gb of the piping block Bg, so that the concerns (difficulty in installation due to large spring constant of the biasing member) and the concerns (difficulty in managing the deformation amount of the biasing member due to individual differences in the overall length of the valve body) can be eliminated. In addition, in the pressure regulating valve 100g in the stopper portion modification 3 of the first embodiment, a compression coil spring can be used as the biasing member 80Gb, so that the spring constant can be set relatively easily to a large value as necessary.

[0103] Second Embodiment A pressure regulating valve 100h in the second embodiment will be described with reference to FIG. 11. The pressure regulating valve 100h in the second embodiment is different from the pressure regulating valve 100a in the first embodiment in that the pressure regulating valve 100a in the first embodiment is arranged upside down while maintaining the outer shape, and a biasing unit 80H and a stopper member 14H are provided on the valve seat portion 12H, but the other configurations are substantially the same as those of the first embodiment. Here, the same configurations are given the same reference numerals, and duplicated explanations are omitted. The pressure regulating valve 100h in the second embodiment includes a first adjusting screw portion 42H (main body side adjusting screw portion 42Ha and valve seat side adjusting screw portion 42Hb) and a second adjusting screw portion Th (valve seat side screw portion 12HTh and stopper side screw portion 14Hth), but the first adjusting screw portion 42H (position adjusting portion) has the same structure as the adjusting screw portion 42 in the first embodiment, so explanations are omitted.

[0104] Here, in the pressure regulating valve 100h in the second embodiment, in order to improve the degree of freedom of the flow direction of the fluid path, the installation direction, etc., the pressure regulating valve 100a in the first embodiment is arranged upside down, and a biasing unit 80H and a stopper member 14H are provided on the valve seat portion 12H, a primary side port 1A is defined in the biasing unit 80H, and a secondary side port 1B is defined in the horizontal hole 11a of the main body 11H. The valve main body 10H is composed of the main body 11H, the valve seat portion 12H, and the stopper member 14H, which are each integrally formed. Here, the valve seat portion 12H, the stopper member 14H, and the biasing unit 80H in the second embodiment will be mainly described in order.

[0105] <Valve seat section> The valve seat portion 12H includes an annular valve seat 12a, an inner circumferential surface 12b, and an open end 12Hd provided on the other end side. A valve seat portion side thread portion 12HTh consisting of a male thread portion is formed on the outer circumferential surface on the other end side of the valve seat portion 12H.

[0106] <About the stopper material> The stopper member 14H (stopper portion) is made of a metal such as stainless steel or phosphorus bronze, and has a generally cylindrical shape with a bottom. The stopper member 14H (stopper portion) is equipped with a cylindrical side wall portion 14He, a stopper portion side thread portion 14Hth consisting of a female thread portion provided on one end side of the side wall portion 14He, a throttle portion 14Hg provided on the other end side of the side wall portion 14He, a contact portion 14Hc provided on the other end side of the throttle portion 14Hg, and an opening 14Hf provided inside the throttle portion 14Hg and coaxial with the axis L.

[0107] <About the energizing unit> The biasing unit 80H (removal direction biasing means) has an approximately cylindrical shape and includes a spring support portion 80Hae that is expanded in diameter near the center, an abutment member 80Ha having a through hole 80Hat extending along the axis L, and a biasing member 80Hb consisting of a compression coil spring.

[0108] The biasing unit 80H is inserted while sliding the abutting member 80Ha on the inner peripheral surface 12b of the valve seat portion 12H, and one end side of the biasing member 80Hb is abutted against the open end 12Hd of the valve seat portion 12H, while the other end side of the biasing member 80Hb is abutted against the spring support portion 80Hae. Then, after the biasing unit 80H is accommodated in the stopper member 14H, the stopper member 14H is fixed to the other end side of the valve seat portion 12H via the second adjustment screw portion Th (valve seat portion side screw portion 12HTh and stopper portion side screw portion 14Hth) and the welded portion W. As a result, the biasing unit 80H and the stopper member 14H are integrally provided to the main body 11H. At this time, the biasing member 80Hb is supported by the outer peripheral surface of the abutting member 80Ha, and is therefore arranged in a state in which bending and falling in the axial direction L are completely suppressed. In addition, in the biasing unit 80H before the pressure regulating valve 100h is attached to the piping block Bh, the spring support portion 80Hae of the contact member 80Ha is pressed toward the other end side in the axial direction L by the biasing member 80Hb, and one end side of the contact member 80Ha (including the contact portion 80Hac) protrudes outward from the opening 14Hf of the stopper member 14H. At this time, the spring support portion 80Hae of the contact member 80Ha is held in contact with the narrowed portion 14Hg of the stopper member 14H that functions as a retainer.

[0109] <Installation of pressure regulating valve> From here on, the shapes of the valve body 10H, the piping block Bh, and the connector C' will be mainly described.

[0110] The valve body 10H is composed of a main body 11H, a valve seat portion 12H, and a stopper member 14H. The main body 11H is formed with a large diameter portion 11L and a small diameter portion 11S, the outer diameter of which gradually decreases from one end to the other end along the axis L direction. The valve seat portion 12H has an outer diameter smaller than that of the small diameter portion 11S. Furthermore, the outer diameter of the stopper member 14H is the same as that of the small diameter portion 11S.

[0111] The piping block Bh has an insertion hole along the axis L direction, and a first housing groove G1 (opening) and an annular groove Ga are formed on one end side of the insertion hole. The inner diameter of the first housing groove G1 is set to be slightly larger than the outer diameter of the large diameter portion 11L of the main body 11H. A secondary side flow passage Fp2 formed in a direction perpendicular to the axis L direction is connected to the annular groove Ga. In addition, a second housing groove G2 and a primary side flow passage Fp1 are formed in the insertion hole along the axis L direction, the diameter of which is reduced stepwise from the annular groove Ga to the other end side. The inner diameter of the second housing groove G2 is set to be slightly larger than the outer diameter of the small diameter portion 11S of the main body 11H. Furthermore, an annular step portion St is formed between the second housing groove G2 and the primary side flow passage Fp1. In addition, an annular seal groove Gs is formed on the other end side of the first housing groove G1, in which a first O-ring Or1 (seal member) is accommodated. A screw hole Sh is formed in one end surface Bs of the piping block Bh.

[0112] The connector C' (fixing means) holds the valve body 10H in the axial direction L in the fluid path, has a shape corresponding to the opening of the fluid path, and includes a flange Cf that protrudes radially outward from one end side to the other end side, an insertion part Ci that is inserted into an insertion hole of the piping block Bh, and an abutment surface Cc on the other end side of the insertion part Ci. The flange Cf is provided with a mounting hole Ch into which the fastening screw Sw is inserted. In addition, a connector annular seal groove Cg in which the second O-ring Or2 is accommodated is formed on the outer circumferential surface of the insertion part Ci. Furthermore, a boss accommodation groove Cgb is formed on the abutment surface Cc of the connector C' coaxially with the axial line L. The connector C' in the second embodiment has a shape corresponding to the opening of the fluid path, but is not limited thereto. For example, the connector C' may be any shape that holds the valve body 10H in the axial direction L in the fluid path, such as a C-shaped ring that is provided in an inner circumferential groove of the fluid path and generates an elastic force in the radial direction.

[0113] <About installation> In the mounting operation of the pressure regulating valve 100h to the piping block Bh, the valve body 10H is inserted into the first accommodation groove G1 (opening) of the piping block Bh and moved to the other end side in the axial direction (upward in FIG. 11), so that the abutment portion 80Hac of the abutment member 80Ha abuts against the annular step portion St. When the valve body 10H is further moved to the other end side in the axial direction L while being pressed by the connector C', the biasing member 80Hb is deformed and contracted in the axial direction L, so that the abutment portion 14Hc of the stopper member 14H abuts against the annular step portion St. The boss portion 52Ha is accommodated in the boss accommodation groove Cgb so as not to interfere with the connector C'. Therefore, the deformation amount of the biasing member 80Hb is regulated by the abutment of the abutment portion 14Hc of the stopper member 14H with the annular step portion St of the piping block Bh. The deformation amount of the biasing member 80Hb in the second embodiment can be adjusted to a desired value before shipment by rotating the stopper member 14H relative to the valve seat portion 12H via the second adjustment screw portion Th and moving it in the direction of the axis L. In the second embodiment, a compression coil spring can be used as the biasing member 80Hb, so that the spring constant can be set relatively large as necessary.

[0114] As a result, in the pressure regulating valve 100h of the second embodiment, in the open valve state, the fluid flows in an L-shaped fluid path in the following order: primary side flow path Fp1 of the piping block Bh, primary side port 1A defined by the through hole 80Hat of the abutment member 80Ha, within the inner surface 12b of the valve seat portion 12, secondary side port 1B defined by the horizontal hole 11a of the main body 11H, and secondary side flow path Fp2 of the piping block Bh.

[0115] As described above, in the pressure regulating valve 100h in the second embodiment, similar to the first embodiment, the conventional problem 1 (incorrect biasing member is used at the installation site) to conventional problem 4 (difficulty in removal due to tilted biasing force) can be eliminated. In addition, in the pressure regulating valve 100h in the second embodiment, similar to the first embodiment, the deformation amount of the biasing unit 80H is set to be larger than the sliding distance of the seal member, so that the valve body 10H can be reliably moved to a position not affected by the first O-ring Or1 in the removal operation. Furthermore, in the pressure regulating valve 100h in the second embodiment, the deformation amount of the biasing member 80Hb is restricted by the abutment portion 14Hc of the stopper member 14H abutting against the annular step portion St of the piping block Bh, and can be adjusted by the second adjustment screw portion Th, so that the concerns (difficulty in installation due to large spring constant of the biasing member) and the concerns (difficulty in managing the deformation amount of the biasing member due to individual differences in the overall length of the valve body) can be eliminated. In addition, in the pressure regulating valve 100h in the second embodiment, since a compression coil spring can be used as the biasing member 80Hb, the spring constant can be set relatively large as necessary. Also, the pressure regulating valve 100h in the second embodiment can improve the degree of freedom of the flow direction of the fluid path, the installation direction, and the like.

[0116] (Third embodiment) A pressure regulating valve 100i in the third embodiment will be described with reference to Fig. 12. The pressure regulating valve 100i in the third embodiment is a straight flow path adaptation of the pressure regulating valve 100f in the stopper portion modified example 2 in the first embodiment, and differs from the pressure regulating valve 100f in the stopper portion modified example 2 in the first embodiment in that a flow path is formed in the axial L direction inside the valve body 10I, but other configurations are substantially the same as those of the stopper portion modified example 2 in the first embodiment. Here, the same configurations are given the same reference numerals, and duplicated explanations will be omitted.

[0117] The pressure regulating valves 100a to 100h in the first and second embodiments have been described as having an L-shaped fluid path. However, the fluid path applicable to the pressure regulating valve in the present embodiment can include not only an L-shaped fluid path but also various variations of the fluid path (for example, a straight-shaped fluid path). Here, a pressure regulating valve 100i in the third embodiment employing a straight flow path will be described.

[0118] In the pressure regulating valve 100i in the third embodiment, a fluid path extending in the axial direction L is formed inside the main body 11I so as to be compatible with a straight flow path, and the structure of the other end of the valve main body 10I (particularly, a sectorial gap 14Io is formed in the stopper member 14I) is devised. Here, the main body 11I, the stopper member 14I, and the biasing member 80I in the third embodiment will be mainly described in order. The valve main body 10I is composed of the main body 11I, the valve seat portion 12, and the stopper member 14I, which are integrally formed via the welded portion W.

[0119] <About the unit> The main body 11I has a cylindrical shape, and a first small diameter section 11IS1, a large diameter section 11L, and a second small diameter section 11IS2 are formed in this order from one end side to the other end side along the axis L. The large diameter section 11L is set to have a larger inner diameter and a larger length in the axis L direction than the first small diameter section 11IS1 and the second small diameter section 11IS2, and therefore a straight-shaped fluid path extending in the axis L direction is defined between the inner peripheral surface of the main body 11I and the outer peripheral surface of the pressure-sensing bellows 51I.

[0120] <About the stopper material> The stopper member 14I will be described with reference to Figures 12(b) and (c). Note that the circular dashed line in Figure 12(c) indicates the outer circumferential surface of the adjacent second small diameter portion 11IS2.

[0121] The stopper member 14I (stopper portion) is made of a metal such as stainless steel or phosphorus bronze, and is formed by pressing a relatively thick and rigid member. As shown in Fig. 12(b), the stopper member 14I includes a recess 14Ir recessed toward the other end side in the direction of the axis L in order to accommodate a bottomed cylindrical pressure-sensing bellows 51I that contains the connecting member 32, a protrusion 14Ip located on the front and back sides of the recess 14Ir and to which the biasing member 80I is fixed, and six spoke portions 14Is that are evenly arranged in the circumferential direction and extend in the radial direction. The outer peripheral edge of a set of three non-adjacent spoke parts 14Is among the six spoke parts 14Is is provided with an abutment part 14Ic that stands toward the other end side in the axial line L direction, and the outer peripheral edge of one end side of the other set of three non-adjacent spoke parts 14Is is provided with a weld part W that is fixed to the other end outer peripheral edge of the main body 11I by spot welding or the like. The outer diameter of the spoke parts 14Is that have the abutment part 14Ic is the same as the large diameter part 11IL of the main body 11I, while the outer diameter of the spoke parts 14Is that do not have the abutment part 14Ic is the same as the second small diameter part 11IS2 of the main body 11I. In addition, a plurality of sector-shaped gaps 14Io that define the secondary side port 1B are formed between the plurality of spoke parts 14Is. In the stopper member 14I of the third embodiment, the number of spoke parts 14Is is six, but this is merely an example and can be selected as necessary.

[0122] <About the biasing member> The biasing member 80I (removal direction biasing means) is composed of a tripod leaf spring, as shown in Figs. 12(d) and (e). The biasing member 80I includes a fixed portion 80Ib having a circular shape when viewed from the axis L direction (see Fig. 12(e)), three abutting portions 80Ic having a substantially rectangular shape and evenly arranged in the circumferential direction, and three connecting portions 80Id extending in a direction having an angle with respect to the axis L direction when viewed from a direction perpendicular to the axis L direction (see Fig. 12(d)) and connecting between the outside of the fixed portion 80Ib and the inside of the abutting portion 80Ic. The fixed portion 80Ib is fixed to the protruding portion 14Ip of the stopper member 14I via welded portions W by spot welding or the like that are evenly arranged in the circumferential direction. As a result, the biasing member 80I and the stopper member 14I are integrally provided to the main body 11I. Further, in order to ensure a smooth flow of fluid passing through the plurality of sectorial gaps 14Io, the connecting portions 80Id of the biasing member 80I completely overlap the spoke portions 14Is of the stopper member 14I when viewed from the axial line L direction.

[0123] <Installation of pressure regulating valve> The shape of the piping block Bi will be described below. Note that the connector C has the same configuration as the connector C in the stopper portion modification 2 of the first embodiment, and therefore the description thereof will be omitted.

[0124] The piping block Bi has an insertion hole along the axis L direction, and a first housing groove G1 and a secondary side flow passage Fp2 are formed in the insertion hole along the axis L direction, the diameter of which decreases stepwise from one end side to the other end side. An annular step portion St is formed between the first housing groove G1 and the secondary side flow passage Fp2. The inner diameter of the first housing groove G1 is set to be slightly larger than the outer diameter of the large diameter portion 11IL of the main body 11I. A screw hole Sh is formed in one end face Bs of the piping block Bi.

[0125] <About installation> In the operation of mounting the pressure regulating valve 100i to the piping block Bi, the valve body 10I is inserted into the first accommodation groove G1 (opening) of the piping block Bi and moved to the other end side in the axial direction (upward in FIG. 12), whereby first, the abutment portion 80Ic of the urging member 80I abuts against the annular step portion St. When the valve body 10I is further moved to the other end side in the axial direction L while being pressed by the connector C, the urging member 80I is deformed and contracted in the axial direction L, whereby the abutment portion 14Ic of the stopper member 14I abuts against the annular step portion St. Therefore, the deformation amount of the urging member 80I is regulated by the abutment of the abutment portion 14Ic of the stopper member 14I with the annular step portion St of the piping block Bi.

[0126] As a result, in the pressure regulating valve 100i of the third embodiment, in the open valve state, the fluid flows in a straight flow path in the following order: the primary side flow path Fp1 of the connector C, the primary side port 1A defined in the valve seat portion 12, the fluid path extending in the axial direction L inside the valve body 10I, the secondary side port 1B defined between the body 11I and the sectorial gap 14Io, and the secondary side flow path Fp2 of the piping block Bi.

[0127] As described above, in the pressure regulating valve 100i in the third embodiment, similarly to the stopper portion modification 2 in the first embodiment, the conventional problem 1 (the wrong urging member is used at the installation work site) to the conventional problem 4 (difficulty in removal due to tilted urging force) can be eliminated. In addition, in the pressure regulating valve 100i in the third embodiment, the deformation amount of the urging member 80I is restricted by the abutment portion 14Ic of the stopper member 14I abutting against the annular step portion St of the piping block Bi, so that the concerns (difficulty in installation due to the large spring constant of the urging member) and the concerns (difficulty in managing the deformation amount of the urging member due to individual differences in the overall length of the valve body) can be eliminated. Furthermore, the pressure regulating valve 100i in the third embodiment can be adapted to various variations in fluid paths (for example, straight-shaped fluid paths), etc.

[0128] (Modification of the biasing unit of the third embodiment) A pressure regulating valve 100j in a modified biasing unit of the third embodiment will be described with reference to Fig. 13. The pressure regulating valve 100j in the modified biasing unit of the third embodiment differs from the pressure regulating valve 100i in the third embodiment in that a biasing unit 80J is provided on the outer peripheral surface of the main body 11J, but other configurations are substantially the same as those of the third embodiment. Here, the same components are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0129] <Regarding concerns (damage to the biasing member due to dropping)> Here, with reference to FIG. 12, a concern that may arise when the pressure regulating valve 100i is dropped in the third embodiment will be described.

[0130] In the pressure regulating valve 100i of the third embodiment, the biasing member 80I is provided on the other end side of the valve body 10I, and therefore is easily accessible from the external environment. Therefore, if the pressure regulating valve 100i is accidentally dropped during installation or the like, there is a risk that the biasing member 80I may be damaged, such as by bending the contact portion 80Ic (hereinafter, this will be referred to as a concern (damage to the biasing member due to dropping)).

[0131] In contrast, in the pressure regulating valve 100j in the biasing unit modification of the third embodiment, as shown in Fig. 13, a biasing unit 80J is provided on the outer peripheral surface of the main body 11J to eliminate the concern (damage to the biasing member due to dropping). Here, the main body 11J, the stopper member 14J, and the biasing unit 80J in the biasing unit modification of the third embodiment will be mainly described in order. The valve main body 10J is composed of the main body 11J, the valve seat portion 12, and the stopper member 14J, which are integrally formed via the welded portion W.

[0132] <About the unit> The main body 11J has a generally cylindrical shape, and a small diameter portion 11JS and a large diameter portion 11JL are formed in this order from one end to the other end along the axis L. The large diameter portion 11JL has an inner diameter and a length in the axis L direction larger than those of the small diameter portion 11JS.

[0133] <About the stopper material> The stopper member 14J will be described with reference to Figures 13(b) and (c). Note that the circular dashed line in Figure 13(c) indicates the outer circumferential surface of the adjacent large diameter portion 11JL.

[0134] The stopper member 14J (stopper portion) is made of a metal such as stainless steel or phosphorus bronze, and is formed by pressing a relatively thick and rigid member. The stopper member 14J has six legs, and is circular when viewed from the axis L direction (see FIG. 13(c)). The stopper member 14J includes a fixed portion 14Jb having an opening 14Ja on the same axis as the axis L, and six spoke portions 14Js arranged evenly in the circumferential direction on the outer periphery of the fixed portion 14Jb. Abutment portions 14Jc extending up toward the other end in the axis L direction are provided on the outer periphery of a non-adjacent set of three spoke portions 14Js among the six spoke portions 14Js, and a weld portion W fixed to the other end outer periphery of the main body 11J by spot welding or the like is provided on the outer periphery of one end of the other non-adjacent set of three spoke portions 14Js. Here, the boss portion 52Ja of the fixing metal fitting 52J is fitted into an opening 14Ja provided in the stopper member 14J, and then the spoke portions 14J and 14J are fitted and fixed to each other via a crimped portion Ri. The outer peripheral edge of one end of the spoke portion 14Js that does not have the abutment portion 14Jc is fixed to the outer peripheral edge of the other end of the main body 11J via a welded portion W by spot welding or the like. The outer diameter of the spoke portion 14Js that has the abutment portion 14Jc is larger than the large diameter portion 11JL of the main body 11J, and the outer diameter of the spoke portion 14Js that does not have the abutment portion 14Jc is the same as the large diameter portion 11JL of the main body 11J. A plurality of sector-shaped gaps 14Jo that define the secondary side port 1B are formed between the plurality of spoke portions 14Js. In the stopper member 14J of the biasing unit modification of the third embodiment, the number of spoke portions 14Js is six, but this is only an example and can be selected as necessary.

[0135] <About the energizing unit> The biasing unit 80J (removal direction biasing means) has a retaining ring 80Jc (e.g., a C-shaped ring) having a radially inward restoring force, an abutment member 80Ja having a circular ring shape when viewed from the axial L direction and an L-shaped cross-sectional shape corresponding to the first annular step portion St1, and a biasing member 80Jb consisting of a compression coil spring.

[0136] In the urging unit 80J, first, a slightly enlarged retaining ring 80Jc is placed in a main body annular groove 11Jr formed in the large diameter portion 11JL. Then, the urging member 80Jb and the abutting member 80Ja are inserted in order from the other end side in the axial direction L while sliding on the outer circumferential surface of the large diameter portion 11JL, and then the other end of the main body 11J and one end of the stopper member 14J are fixed via a welded portion W. As a result, the abutting member 80Ja is pressed toward the other end side in the axial direction L by the urging member 80Jb, but is held in a state of abutment against the stopper member 14J that functions as a retainer.

[0137] <Installation of pressure regulating valve> The shape of the piping block Bj will be described. Note that the connector C has the same configuration as the connector C in the third embodiment, and therefore the description will be omitted.

[0138] The piping block Bj has an insertion hole along the axis L direction, and the insertion hole along the axis L direction is formed with a first housing groove G1, a second housing groove G2, and a secondary side flow passage Fp2, the diameter of which is reduced stepwise from one end side to the other end side. A first annular step portion St1 is formed between the first housing groove G1 and the second housing groove G2, and a second annular step portion St2 is formed between the second housing groove G1 and the secondary side flow passage Fp2. Furthermore, the inner diameter of the first housing groove G1 is set to be slightly larger than the outer diameter of the biasing unit 80J. In addition, the inner diameter of the second housing groove G2 is set to be slightly larger than the outer diameter of the large diameter portion 11JL. A screw hole Sh is formed in one end face Bs of the piping block Bj.

[0139] <About installation> In the mounting operation of the pressure regulating valve 100j to the piping block Bj, the valve body 10J is inserted into the first accommodation groove G1 (opening) of the piping block Bj and moved to the other end side in the axial direction L (upward in FIG. 13), whereby the abutment member 80Ja of the urging unit 80J first abuts against the first annular step portion St1. When the valve body 10J is further moved to the other end side in the axial direction L while being pressed by the connector C, the urging member 80Jb is deformed and contracted in the axial direction L, whereby the abutment portion 14Jc of the stopper member 14J abuts against the second annular step portion St2. Therefore, the deformation amount of the urging member 80Jb is restricted by the abutment of the abutment portion 14Jc of the stopper member 14J with the second annular step portion St2 of the piping block Bj.

[0140] As a result, in the pressure regulating valve 100j in the biasing unit variant of the third embodiment, the biasing unit 80J is provided on the outer peripheral surface of the main body 11J. Therefore, even if the pressure regulating valve 100j is accidentally dropped during installation work, etc., the biasing member 80Jb is made of a compression coil spring rather than a leaf spring, and the inner peripheral side of the biasing member 80Jb is supported by the large diameter portion 11JL so that it is constantly prevented from bending or twisting, thereby eliminating the concern (damage to the biasing member due to being dropped).

[0141] As described above, in the pressure regulating valve 100j in the biasing unit modification of the third embodiment, similarly to the third embodiment, it is possible to solve the conventional problem 1 (the wrong biasing member is used at the installation work site) to the conventional problem 4 (difficulty in removal due to tilted biasing force). Also, in the pressure regulating valve 100j in the biasing unit modification of the third embodiment, the deformation amount of the biasing member 80Jb is restricted by the abutment portion 14Jc of the stopper member 14J abutting against the second annular step portion St2 of the piping block Bj, so that it is possible to solve the concerns (difficulty in installation due to large spring constant of the biasing member) and (difficulty in managing the deformation amount of the biasing member due to individual differences in the overall length of the valve body). Furthermore, in the pressure regulating valve 100j in the biasing unit modified example of the third embodiment, the biasing unit 80J is provided on the outer peripheral surface of the main body 11J. Therefore, even if the pressure regulating valve 100j is accidentally dropped during installation work or the like, the inner peripheral side of the biasing member 80Jb consisting of a compression coil spring is supported by the large diameter portion 11JL so that it is constantly prevented from bending or twisting, thereby eliminating the concern (damage to the biasing member due to being dropped).

[0142] <Other> It goes without saying that the pressure regulating valves 100a to 100j of the present embodiment can be applied to any fluid device or fluid circuit. Furthermore, the present invention is not limited to the above-mentioned aspects, embodiments, and modified examples, and can be appropriately modified or altered without departing from the technical concept of the present invention. [Explanation of symbols]

[0143] 100a~100j Pressure Regulating Valve 1A primary port 1B Secondary port 10, 10B, 10C, 10D, 10F, 10G, 10H, 10I, 10J Valve body 11, 11B, 11C, 11D, 11H, 11I, 11J Body (valve body) 11a Side Cave 11d,11Cd,11Dd Open end 11ep Equal pressure path 11IS1 1st small diameter section 11IS2 2nd small diameter section 11L, 11IL, 11JL Large diameter section 11Jr Body Circular Groove 11n Neck 11o opening 11S,11JS Small diameter part 11st stopper part 11u bottom 12, 12C, 12D, 12H Valve seat (valve body) 12a Valve seat 12b Inner surface 12c Pair of rotary tool inserts 12d, 12Cd, 12Dd, 12Hd Open end (pressure part) 12De Annular seal groove on valve seat 12Df flange 12HTh Valve seat side thread 14F, 14G, 14H, 14I, 14J Stopper parts (stopper parts, valve body) 14Fa,14Ja opening 14Fb,14Gb,14Jb Fixed part 14Fc,14Gc,14Hc,14Ic,14Jc Contact part 14Fs, 14Is, 14Js spokes 14Ge,14He side wall 14Gf,14Hf opening 14Gg, 14Hg Squeezing section 14Hth Stopper side thread 14Ic Contact part 14Io,14Jo Fan-shaped gap 14Ip convex part 14Ir Concave 20 Valve body 21 Valve section 22 Boss section 30 Slide unit 31 Cylinder parts 32 Connecting members 33 Piston parts 40 Adjustment spring unit 41 Valve spring 42 Adjustment screw part (position adjustment part) 42a, 42Ha Body side adjustment screw 42b, 42Hb Valve seat side adjustment screw 42H First adjustment screw (position adjustment) 50 Pressure-sensing bellows unit 51,51I Pressure-sensing bellows 52, 52F, 52J Fixing bracket 52a, 52Fa, 52Ha, 52Ja boss section 70 Sliding contact member 71 Circular ring fixing part 72 Legs 73 Curved Section 80, 80E, 80Gb, 80Hb, 80I, 80Jb, 81, 82, 83 - biasing member (removal direction biasing means) 80a,81a,82a,83a opening 80b,80Ib,81b,82b,83b Fixed part 80c,80Ic,81c,82c,83c Contact part 80d, 80Id, 81d, 82d, 83d Connection 80G, 80H, 80J Urging unit (removal direction urging means) 80Ga, 80Ha, 80Ja Contact parts 80Gac,80Hac Contact part 80Gae, 80Hae Spring support part 80Hat through hole 80Jc retaining ring A Containment Room As Storage space (fluid path) B, Bd, Be, Bg, Bh, Bi, Bj Piping block Bs One end face C,C' Connector (fixing means) Cc contact surface Cf flange Cg Connector annular seal groove Cgb boss accommodation groove Ch mounting hole Ci Insertion Section D, D' Maximum diameter of valve body Ep pressure equalization path FB, FB' biasing force of biasing member FD, FD' Force acting on the valve body from fluid pressure Fp1 Primary flow path Fp2 Secondary flow path G1 First receiving groove (opening) G2 Second Receiving Groove Ga Annular groove Gb bottom Gp Gap Gs Annular seal groove L axis L1, L1' Deformation amount of the biasing member L2, L2' Seal member sliding distance La Overall length of the valve body in the axial direction Or1 First O-ring (sealing material) Or2 Second O-ring P1 Primary pressure P2 Secondary pressure Ri rivet part Sh screw hole St Annular step St1 First annular step St2 Second annular step Sw Fastening Screw Th 2nd adjustment screw W, WC, WD Welded parts (joints)

Claims

1. A pressure regulating valve that is inserted into a fluid path, a valve body having a bottomed cylindrical shape and including a valve seat; a valve body that moves in an axial direction and seats on or leaves the valve seat; Equipped with The valve body is integrally provided with a removal direction biasing means, In an attached state in which the valve body is inserted into the fluid path by a fixing means abutting against one end of the valve body, The pressure regulating valve according to claim 1, wherein the ejection direction biasing means has a biasing force for biasing the valve body in the ejection direction of the fluid path.

2. 2. The pressure regulating valve according to claim 1, wherein the biasing force of the removal direction biasing means is set to be greater than the force that the valve body receives from the fluid pressure, so that the valve body does not move in the installation direction due to fluid pressure in the installed state.

3. The valve body includes a stopper portion, 2. The pressure regulating valve according to claim 1, wherein in the attached state, the stopper portion abuts against the fluid path, thereby restricting an amount of deformation occurring in the removal direction biasing means.

4. In the attached state, A seal member is sandwiched between an outer circumferential surface of the valve body and an inner circumferential surface of the fluid path, 3. The pressure regulating valve according to claim 1, wherein the amount of deformation of the removal direction biasing means is set to be greater than a distance that the seal member moves in an axial direction in a compressed state when the valve body is inserted into the fluid path.

5. a pressure-sensing bellows unit that biases the valve body toward the valve seat, The pressure-sensing bellows unit has a boss portion protruding from the other end thereof, 2. The pressure regulating valve according to claim 1, wherein the boss portion has a crimped portion which is fitted and fixed to an opening provided in a bottom portion of the valve body and an opening provided in the removal direction biasing means.

6. The valve body includes a body and a valve seat portion having the valve seat, A position adjustment unit is further provided that can change the relative position of the main body and the valve seat in the axial direction.

3. The pressure regulating valve according to claim 1, wherein the position adjustment portion defines an overall length of the valve body in an axial direction.

7. The removal direction biasing means is A fixing part fixed directly or indirectly to the bottom part of the valve body; a contact portion that contacts the fluid path in the attached state; 3. The pressure regulating valve according to claim 1, further comprising a connecting portion that connects the fixed portion and the abutting portion.

8. The valve body has a cylindrical shape with a bottom that is open at one end, 3. The pressure regulating valve according to claim 1, further comprising a pressure equalizing passage extending in an axial direction in the valve body, for equalizing pressure in an accommodation space defined between the other end side of the valve body and the fluid path.

9. A joint portion is formed on one end side of each of the main body and the valve seat portion, by which the main body and the valve seat portion are fixed to each other, One end of the valve seat portion has a pressing portion that is pressed by the fixing means, The pressure regulating valve according to claim 6, wherein the joint portion is formed on the other end side of the pressing portion.

10. A connection structure characterized in that the pressure regulating valve according to any one of claims 1 to 5 and the fixing means having a shape corresponding to an opening of the fluid path are inserted into the fluid path, thereby connecting the pressure regulating valve to the fluid path.

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