Pressure control valve

Abstract

To provide a pressure control valve in which a bleed flow path is formed, the bleed flow path having extremely high versatility, capable of being introduced at low cost, and capable of suppressing generation of vibration or noise to significantly improve responsiveness during valve opening.SOLUTION: A pressure control valve 100a is inserted into a fluid path, and comprises: a cylindrical valve body 10 having a primary side port 1A, a secondary side port 1B, and a valve seat 13a; a valve element 20 that moves in an axial direction L, and seats or unseats relative to the valve seat 13a; and biasing means 41, 51 for biasing the valve element 20 toward the valve seat 13a. The valve element 20 and the biasing means 41, 51 are arranged in the valve body 10. A bleed flow path Bc1 constantly connecting the primary side port 1A and the secondary side port 1B is formed by a gap between an outer peripheral surface of the valve body 10 and the fluid path.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pressure regulating valve which employs a one-cartridge type valve body that houses a valve element and a pressure-sensing bellows, and which forms a bleed flow passage on the outer circumferential surface of the valve body. [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 flow paths formed in piping blocks in order to reduce weight and space.

[0003] Here, for example, Patent Document 1 discloses a pressure regulating valve 1500 (hereinafter referred to as a "conventional pressure regulating valve") as shown in Fig. 15, which includes a valve body 1510 having a primary side port 1501A, a secondary side port 1501B, and a valve seat 1513a, and a valve element 1520 that is seated on or separated from the valve seat 1513a. Patent Document 1 also discloses a pressure regulating valve further including a slide unit 1530 that supports the slide of the valve element 1520 in the direction of the axis L, an adjustment spring unit 1540 that adjusts the biasing force of a valve spring 1541 via an adjustment screw member 1542, a pressure sensing bellows unit 1550 that has a pressure sensing bellows 1551, and an elastic member 1570 that contacts an inner peripheral surface 1513b.

[0004] However, since the conventional pressure regulating valve 1500 is connected between the primary piping and the secondary piping via a relatively large diameter flange or the like, it cannot be applied to flow paths within a piping block, and there was a risk that it would have extremely low versatility (hereinafter referred to as "Conventional Problem 1 (Inapplicability to piping blocks)").

[0005] Depending on the application, the pressure regulating valve may need to be incorporated into a fluid circuit that allows fluid to flow constantly without being blocked, or may need to avoid hunting that occurs in the valve body when the valve is open in an environment where the pressure difference between the primary pressure P1 and the secondary pressure P2 is relatively large. Therefore, there has been a demand for the pressure regulating valve to be provided with a bleed flow path that constantly fluidly connects the primary port and the secondary port even when the valve is closed.

[0006] Patent Document 1 (see, in particular, paragraph

[0053] and FIG. 1 of Patent Document 1) describes a conventional pressure regulating valve 1500 in which a bleed hole 1520a is formed as the bleed flow passage Bc15 in a valve element 1520 (or a valve body 1510). However, in the conventional pressure regulating valve 1500, when the bleed hole 1520a is formed in the valve element 1520 (or the valve body 1510), in the valve closed state, the bleed flow passing through the bleed flow passage Bc15 collides in a turbulent state with the valve element 1520 itself and the pressure-sensing bellows 1551 that controls the valve element opening degree, which may cause vibrations and abnormal noise, and may reduce responsiveness when the valve is opened (hereinafter, referred to as "Conventional problem 2 (adverse effect of bleed flow on the valve element and pressure-sensing bellows)"). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-16290 A Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a pressure regulating valve which forms a bleed flow path that is extremely versatile, allows the bleed flow path to be introduced at low cost, suppresses the generation of vibrations and abnormal noise, and significantly improves responsiveness when the valve is opened. [Means for solving the problem]

[0009] In order to solve the above problems, a pressure regulating valve that is inserted into a fluid path includes a cylindrical valve body having a primary side port, a secondary side port, and a valve seat, a valve disc that moves in an axial direction and seats on and releases from the valve seat, and a biasing means that biases the valve disc toward the valve seat, wherein the valve disc and the biasing means are disposed within the valve body, and a bleed flow path that constantly communicates between the primary side port and the secondary side port consists of a gap between the outer peripheral surface of the valve body and the fluid path.

[0010] In the above pressure regulating valve, the inlet of the bleed flow passage may be disposed radially outward of the primary side port when viewed in the axial direction.

[0011] In the above pressure regulating valve, an outer circumferential surface of the valve body may have at least one recess extending in an axial direction, and the bleed flow passage may include the recess.

[0012] Moreover, the above pressure regulating valve may further comprise a support means on an outer peripheral surface of the valve body for supporting the valve body with respect to the fluid path, and the support means may be provided with the bleed flow path.

[0013] Moreover, in the above pressure regulating valve, the support means may be made of an elastic member disposed between the valve body and the fluid path, and the bleed flow path may include at least one slit and / or a through hole provided in the elastic member.

[0014] In the above pressure regulating valve, the support means may be formed of a threaded portion having a threaded gap between itself and the fluid path, and the bleed flow passage may include the threaded gap.

[0015] Moreover, in the pressure regulating valve, the threaded portion may have at least one recess extending in an axial direction, and the bleed flow passage may include the recess of the threaded portion.

[0016] Moreover, the above pressure regulating valve may further include a support means on an outer peripheral surface of the valve body for supporting the valve body against the fluid path, the support means consisting of a seal member for sealing between a flange portion of the valve body and the fluid path, the flange portion of the valve body being provided with a communication portion penetrating in the axial direction radially inward of the seal member when viewed in the axial direction, and the bleed flow path may include the communication portion.

[0017] In addition, in the above pressure regulating valve, the other end or one end of the valve body may have an abutment portion that abuts against the annular step portion of the fluid path, and a non-abutment portion that extends radially without abutting against the annular step portion of the fluid path, and the bleed flow path may include the non-abutment portion. Effect of the Invention

[0018] According to the present invention, it is possible to provide a pressure regulating valve which forms a bleed flow path that is extremely versatile, allows the bleed flow path to be introduced at low cost, suppresses the generation of vibrations and abnormal noise, and significantly improves responsiveness when the valve is opened. [Brief description of the drawings]

[0019] [Figure 1] 1A and 1B are explanatory views showing a pressure regulating valve according to a first embodiment of the present invention, where (a) is a vertical cross-sectional view and (b) is a top view. [Diagram 2] FIG. 2 is a top perspective view of the pressure regulating valve shown in FIG. 1. [Diagram 3] 2 is a cross-sectional view showing a state in which the pressure regulating valve shown in FIG. 1 is attached to a piping block. [Figure 4] 4A and 4B are explanatory diagrams showing the use states of the pressure regulating valve shown in FIG. 3, where (a) shows the valve closed state and (b) shows the valve open state. [Diagram 5] 1(b) is a top view (corresponding to FIG. 1(b)) of a pressure regulating valve in a bleed flow path modification 1 of the first embodiment. FIG. [Figure 6]6 is a cross-sectional view (corresponding to FIG. 4(a)) showing a state in which the pressure regulating valve shown in FIG. 5 is attached to a piping block. [Figure 7] 5A and 5B are explanatory views of a pressure regulating valve in a bleed flow passage modification 2 of the first embodiment, where (a) is an upper perspective view and (b) is a top view. [Figure 8] 8 is a cross-sectional view showing a state in which the pressure regulating valve shown in FIG. 7 is attached to a piping block. [Figure 9] 5A and 5B are explanatory views showing a pressure regulating valve according to a second embodiment, where (a) is an upper perspective view and (b) is a top view. [Figure 10] 10 is a cross-sectional view showing a state in which the pressure regulating valve shown in FIG. 9 is attached to a piping block. [Figure 11] 13A and 13B are explanatory views of a pressure regulating valve in a first modified bleed flow passage of the second embodiment, where FIG. 13A is an upper perspective view, and FIG. [Figure 12] 13A and 13B are explanatory diagrams of a pressure regulating valve in a bleed flow passage modification 2 of the second embodiment, in which (a) is an upper perspective view, and (b) is a top view. [Figure 13] 10A and 10B are explanatory diagrams of a pressure regulating valve in a modified mounting direction of the second embodiment, in which (a) is a bottom perspective view, and (b) is a bottom view of a valve seat portion; [Figure 14] 14 is a cross-sectional view showing a state in which the pressure regulating valve shown in FIG. 13 is attached to a piping block. [Figure 15] FIG. 1 is a cross-sectional view showing a pressure regulating valve according to a conventional technique. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] An embodiment of the present invention will be described in detail with reference to Figures 1 to 14. However, the present invention is not limited to this embodiment.

[0021] <Terminology> In the present specification and claims, the terms "left", "right", "upper" and "lower" refer to the directions shown in Fig. 1(a), Fig. 3, Fig. 4, Fig. 6, Fig. 8, Fig. 10 and Fig. 14. 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 approximate value calculated based on the average diameter of the minimum inner diameter of the bellows shape (the inner diameter of the "valve" 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 "biasing member" refers to a "member that biases the valve body toward the valve seat (e.g., a valve spring, a pressure-sensing bellows, etc.)." In the present specification and claims, a "bleed flow passage" refers to a "flow passage that constantly fluidically connects the primary side port and the secondary side port even when the valve is closed." In the present specification and claims, a "support means" refers to a means for supporting the valve body relative to the fluid path. In the present specification and claims, "extending in the axial direction" refers to "extending along the axial direction at a predetermined angle to the axial direction in addition to extending parallel to the axial direction."

[0022] (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 Figs. 1 and 2. In Fig. 2, the elastic member Em having the slit s provided in the outer circumferential groove 13g is omitted. 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, and a sliding member 70. Each component of the pressure regulating valve 100a will be described below in order. A high primary pressure P1 is introduced to the primary port 1A, while a low secondary pressure P2 is introduced to the secondary port 1B.

[0023] Here, although details will be described later, the pressure regulating valve 100a of the first embodiment employs a one-cartridge type in which all components (such as the valve body 20 and the pressure-sensing bellows 51) are accommodated in the valve body 10, and the pressure regulating valve 100a is inserted into a fluid path, forming a bleed flow path Bc1 (see FIG. 4(a)) in the gap between the outer circumferential surface of the valve body 10 and the fluid path. As a result, the pressure regulating valve 100a of the first embodiment can simultaneously solve the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of bleed flow on the valve body and the pressure-sensing bellows), and as a result, it is highly versatile, the bleed flow path Bc1 can be introduced at low cost, the generation of vibrations and abnormal noise can be suppressed, and the responsiveness when the valve is opened can be significantly improved.

[0024] The valve body 10 is made of a metal such as stainless steel or aluminum, and includes a cylindrical body 11, a bottom plate portion 12 having a plurality of fan-shaped gaps 12a when viewed from the direction of the axis L, and a valve seat portion 13 having a substantially cylindrical shape and configured separately from the body 11. Note that in the first embodiment, the body 11 and the bottom plate portion 12 are described as being separate bodies, but this is not limiting, and for example, the body 11 and the bottom plate portion 12 may be integrally molded.

[0025] The main body 11 has a valve seat portion 13 screwed to one end and a bottom plate portion 12 welded to the other end, thereby defining an accommodation chamber A therein and defining a secondary side port 1B between the main body 11 and the sectorial gap 12a.

[0026] 1(b) and 2, the bottom plate portion 12 includes a plurality of (e.g., three) spoke portions 12s extending in the radial direction and an opening portion 12o opening coaxially with the axis L, and a plurality of sectorial gaps 12a that define the secondary side port 1B are formed between the plurality of spoke portions 12s. The outer peripheral edge portions on one end side of the spoke portions 12s are fixed to the outer peripheral edge portion at the other end portion 11u of the main body 11 via a welded portion W by spot welding or the like.

[0027] The valve seat portion 13 includes an annular valve seat 13a, an inner peripheral surface 13b that defines the primary side port 1A, a pair of rotary tool insertion portions 13d formed on one end surface and arranged at symmetrical positions with respect to the axis L, a flange portion 13f provided on the one end side, and an outer peripheral groove 13g provided on the outer peripheral surface of the flange portion 13f. As will be described in detail later, the outer peripheral groove 13g accommodates an elastic member Em (supporting means) (e.g., a notched O-ring, an O-ring with a through hole, a C-shaped ring having elasticity in the radial direction, etc.) that has an outer diameter larger than that of the flange portion 13f and has at least one slit s and / or a through hole extending in the direction of the axis L. The at least one slit s and / or the through hole extending in the direction of the axis L allows fluid communication in the direction of the axis L even when the pressure regulating valve 100a is inserted into the fluid path.

[0028] 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.

[0029] The valve portion 21 has an outer diameter larger than the valve seat 13a, and is seated on or separated from the valve seat 13a by moving in the direction of the axis L. The boss portion 22 fits into the opening of the sliding contact member .

[0030] 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.

[0031] The adjustment spring unit 40 includes a valve spring 41 (biasing means) which is a compression spring, and an adjustment screw portion 42 which adjusts the biasing force applied to the valve body 20 by expanding and contracting the valve spring 41 and a pressure-sensing bellows 51.

[0032] 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 13, which are separate bodies, and are screwed together. Here, the biasing force adjustment means for the valve body 20 engages an adjustment jig with a pair of rotary tool insertion portions 13d before shipping, and rotates the valve seat portion 13 relative to the body 11 via the adjustment screw portion 42 to move it in the axial direction L. This adjusts 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, and sets the valve to open at a desired valve opening pressure setting value. Furthermore, after the biasing force against the valve body 20 is adjusted by the biasing force adjustment means, a welded portion W is provided to fix the middle portion of the valve seat portion 13 and one end portion 11d of the body 11 to each other by welding or the like from the radially outer side while the valve body 20 is biased against the valve seat portion 13. In this case, a welded portion W is provided in a ring shape without any gaps between the outer peripheral surface at the middle part of the valve seat portion 13 and the inner peripheral surface at one end 11d of the main body 11 when viewed from the radial outside, so that a bleed flow path that constantly connects the primary side port 1A and the secondary side port 1B is not formed through the gap between the valve seat portion 13 and the main body 11.

[0033] 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 (urging means) 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.

[0034] 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.

[0035] 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 13. 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 pressure-receiving area (effective pressure-receiving area) is not limited to an approximate value calculated based on the average inner diameter of the minimum and maximum inner diameters of the bellows shape, and the dimensions of each part of the pressure regulating valve 100a can also be set using an actual pressure-receiving area obtained through experiments.

[0036] In addition, the fixing bracket 52 has a boss portion 52a that protrudes to the other end side coaxially with the axis L, and this boss portion 52a is fitted into the opening 12o of the bottom plate portion 12, and then a crimping portion Cr is formed by crimping processing, and the boss portion 52a is fixed to the bottom plate portion 12, i.e., the valve body 10.

[0037] 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 (in this example, eight legs 72 are arranged at equal intervals on the same circumference), 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 13b of the valve seat part 13. 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 13b of the valve seat portion 13, the curved portion 73 comes into sliding contact with the inner circumferential surface 13b of the valve seat portion 13 in approximately point contact.

[0038] <Installation of pressure regulating valve> First, the shapes of the valve body 10 and the piping block Bf1 will be described with reference to Fig. 2 and Fig. 3. In Fig. 3, the engagement surfaces of the valve body 10 that engage with the first accommodating groove G1 and the second accommodating groove G2 are labeled with a first engagement surface Es1 and a second engagement surface Es2 that correspond to the numbers of the respective accommodating grooves.

[0039] 2, the valve body 10 has a body 11 and a bottom plate portion 12 that have the same outer diameter from one end side to the other end side, and the outer diameter of a flange portion 13f of a valve seat portion 13 fixed to one end side of the body 11 is set to be larger than the outer diameters of the body 11 and the bottom plate portion 12. An outer circumferential groove 13g provided on the outer circumferential surface of this flange portion 13f accommodates an elastic member Em (see FIG. 3) that has an outer diameter larger than that of the flange portion 13f and has at least one slit s extending in the axial L direction.

[0040] Next, as shown in Fig. 3, the piping block Bf1 has an insertion hole along the axis L direction, and a primary side flow path Fp1 and a secondary side flow path Fp2 are formed on one end side and the other end side of this insertion hole. A first housing groove G1 and a second housing groove G2 are formed in this insertion hole along the axis L direction, and the diameter of the first housing groove G1 and the second housing groove G2 are gradually reduced in a stepped manner from one end side to the other end side. Here, the gaps are controlled so that the inner diameter of the first housing groove G1 is slightly larger than the outer diameter of the flange portion 13f of the valve seat portion 13, and the inner diameter of the second housing groove G2 is slightly larger than the outer diameters of the bottom plate portion 12 and the main body 11, so that the pressure regulating valve 100a can be inserted into the fluid path.

[0041] <About installation> The operation of mounting the pressure regulating valve 100a to the piping block Bf1 will be described. The pressure regulating valve 100a is inserted from one end side of the primary side flow passage Fp1 along the axis L direction of the piping block Bf1. Then, the valve body 10 is moved to a desired position toward the other end side in the axis L direction while sliding the first engagement surface Es1 of the valve body 10 into the first accommodation groove G1 of the piping block Bf1 and the second engagement surface Es2 of the valve body 10 into the second accommodation groove G2 of the piping block Bf1. In this mounting state of the pressure regulating valve 100a, the primary side port 1A defined in the valve seat portion 13 communicates with the primary side flow passage Fp1 to which the primary side pressure P1 is introduced, and the secondary side port 1B defined between the body 11 and the sectorial gap 12a communicates with the secondary side flow passage Fp2 to which the secondary side pressure P2 is introduced. At this time, an elastic member Em having at least one slit s is sandwiched between the outer peripheral groove 13g in the flange portion 13f of the main body 11 and the first accommodating groove G1, thereby providing the valve body 10 with sliding resistance against the fluid path, and as a result, the pressure regulating valve 100a can be supported within the fluid path.

[0042] <Operation of the pressure regulating valve> 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 portions 73 of the sliding contact member 70 are pressed by the radially outward elastic force of the multiple leg portions 72, and therefore have sliding resistance against the inner circumferential surface 13b of the valve seat portion 13.

[0043] First, the pressure regulating valve 100a in the valve closed state will be described with reference to Fig. 4(a). 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, the valve element 20 does not leave the valve seat 13a 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.

[0044] Next, the pressure regulating valve 100a in the valve open state will be described with reference to Fig. 4(b). When the pressure in the primary side port 1A further increases 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 contact member 70, the valve element 20 leaves the valve seat 13a and the fluid flows from the primary side port 1A to the secondary side port 1B.

[0045] 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 13a.

[0046] <About the bleed passage> As described above, in the conventional pressure regulating valve, as shown in FIG. 15, the primary piping and secondary piping are connected via a relatively large diameter flange or the like, and therefore there is the conventional problem 1 (inapplicability to piping blocks).

[0047] Furthermore, in conventional pressure regulating valves, bleed holes 1520a are formed in the valve element 1520 (or valve body 1510), and when the valve is closed, the bleed flow passing through the bleed flow path Bc15 collides in a turbulent state with the valve element 1520 itself and the pressure-sensing bellows 1551 that controls the valve element opening degree, resulting in conventional problem 2 (adverse effect of the bleed flow on the valve element and pressure-sensing bellows).

[0048] In response to this, through the inventor's intensive research, the pressure regulating valve 100a of the first embodiment adopts a one-cartridge type in which all components (such as the valve element 20 and the pressure-sensing bellows 51) are housed in the valve body 10, and the pressure regulating valve 100a is inserted into the fluid path, and a bleed flow path that constantly communicates the primary side port 1A and the secondary side port 1B even in the valve closed state is formed in the gap between the outer circumferential surface of the valve body 10 and the fluid path. As a result, the pressure regulating valve 100a of the first embodiment can simultaneously solve the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of the bleed flow on the valve element and the pressure-sensing bellows), and as a result, it is highly versatile, the bleed flow path Bc1 can be introduced at low cost, the generation of vibrations and abnormal noise can be suppressed, and the responsiveness when the valve is opened can be significantly improved.

[0049] The bleed flow path Bc1 in the first embodiment will be specifically described below from one end side to the other end side with reference to FIG. 4(a).

[0050] At one end, there is a controlled gap between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 (valve seat portion 13) and the first housing groove G1. In addition, an elastic member Em (supporting means) having at least one slit s is sandwiched between the outer peripheral groove 13g provided on this first engagement surface Es1 and the first housing groove G1. This controlled gap and the slit s form a bleed flow passage Bc1 that is fluidly connected to the bleed flow inlet Bc1i. The bleed flow inlet Bc1i is disposed radially outward of the primary side port 1A as viewed from the axis L direction.

[0051] Next, a relatively large gap is formed between the first accommodating groove G1 and a non-engagement surface (outer peripheral surface) that continuously connects the first engagement surface Es1 and the second engagement surface Es2 of the valve body 10, and this relatively large gap forms a bleed flow path Bc1 that is fluidly connected to the bleed flow inlet Bc1i.

[0052] At the other end side, a controlled gap is formed between the second engagement surface Es2 (outer peripheral surface) of the valve main body 10 (main body 11) and the second housing groove G2, and this controlled gap constitutes a bleed flow passage Bc1 that is fluidly connected to the bleed flow outlet Bc1o. Note that the bleed flow outlet Bc1o is disposed in an area where the outer peripheral edge of one end side of the spoke portion 12s in the bottom plate portion 12 is not fixed to the outer peripheral edge of the other end side of the main body 11, that is, in the sectorial gap 12a.

[0053] As described above, the pressure regulating valve 100a of the first embodiment employs a one-cartridge type in which all components (such as the valve element 20 and the pressure-sensing bellows 51) are housed in the valve body 10, and the pressure regulating valve 100a is inserted into the fluid path, forming a bleed flow path Bc1 that constantly communicates the primary side port 1A and the secondary side port 1B even in the valve closed state in the gap between the outer circumferential surface of the valve body 10 and the fluid path. Also, in the pressure regulating valve 100a of the first embodiment, the inlet Bc1i for the bleed flow is disposed radially outward of the primary side port 1A as viewed from the axial line L direction. As a result, in the pressure regulating valve 100a of the first embodiment, the bleed flow path Bc1 (see dashed arrow in the figure) in the valve closed state shown in Figure 4(a) can be completely separated from the main flow path (see solid arrow in the figure) in the valve open state shown in Figure 4(b), thereby completely preventing the bleed flow from adversely affecting the valve body 20 itself and the pressure-sensing bellows 51 that controls the valve body opening degree in the valve closed state.

[0054] Therefore, the pressure regulating valve 100a of the first embodiment can simultaneously solve the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of the bleed flow on the valve body and the pressure-sensing bellows), and as a result, it is highly versatile, the bleed flow path Bc1 can be introduced at low cost, the generation of vibration and abnormal noise can be suppressed, and the responsiveness when the valve is opened can be significantly improved. Also, in the pressure regulating valve 100a of the first embodiment, the gap between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1, and between the second engagement surface Es2 (outer peripheral surface) and the second housing groove G2 are appropriately managed, and the flow path area that becomes the bottleneck of the bleed flow path Bc1 can be adjusted, so that the bleed flow rate can be set to a desired value.

[0055] In the first embodiment, the pressure regulating valve 100a is supported in the fluid path and the bleed flow path Bc1 is defined by using an elastic member Em (e.g., a notched O-ring, a C-shaped ring having elasticity in the radial direction, etc.) having at least one slit s on the first engagement surface Es1 (outer peripheral surface) of the valve body 10, but the present invention is not limited to this. For example, the pressure regulating valve 100a may be supported in the fluid path by light press-fitting by controlling the gap between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 and the fluid path so as to be relatively small, and the surface roughness of the first engagement surface Es1 (outer peripheral surface) of the valve body 10 may be controlled to form a bleed flow path between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 and the fluid path.

[0056] (Bleed flow passage modification 1 of the first embodiment) The pressure regulating valve 100b in the bleed flow passage modification 1 of the first embodiment will be described with reference to Figs. 5 and 6. The pressure regulating valve 100b in the bleed flow passage modification 1 of the first embodiment differs from the pressure regulating valve 100a of the first embodiment in that the outer circumferential surface of the valve body 10B has at least one outer circumferential surface cutout portion 11Br (recess) extending in the axial direction L, but the other configurations are the same as those of the first embodiment. Here, the same configurations are given the same reference numerals, and duplicated explanations will be omitted. Also, Fig. 5 shows the elastic member Em having the slit s provided in the outer circumferential groove 13g omitted.

[0057] <Regarding the issue of concern (blockage of bleed flow by small diameter annular area)> Here, a concern regarding the pressure regulating valve of the first embodiment, that is, an annular region formed in the fluid path and having a smaller inner diameter than a desired one, will be described with reference to FIG.

[0058] First, the fluid path consisting of the first housing groove G1 and the second housing groove G2 is formed by boring, etc., in which a cutting tool is used to cut in the circumferential direction while gradually feeding in the direction of the axis L. During this process, there is a risk that a circular region with a smaller diameter than desired will be formed, particularly along the circumferential direction of the fluid path, due to processing errors caused by interference of cutting chips with the cutting tool.

[0059] Here, since the second engagement surface Es2 has a greater length in the axial direction L than the first engagement surface Es1, there is a high possibility that an annular region having a smaller diameter than desired is formed in the second accommodating groove G2 facing the second engagement surface Es2, compared to the first accommodating groove G1 facing the first engagement surface Es1. Therefore, if an annular region having a smaller diameter than desired is formed in the second engagement surface Es2, there is a risk that the gap between the second engagement surface Es2 and the second accommodating groove G2 will disappear in this annular region, and the bleed flow will be blocked (hereinafter, this will be referred to as "concern (blockage of the bleed flow by a small-diameter annular region)").

[0060] In contrast, as shown in Figures 5(a) and (b), the pressure regulating valve 100b in the bleed flow passage modification 1 of the first embodiment has at least one (e.g., three) outer peripheral surface cutout portion 11Br extending in the axial direction L on the outer peripheral surface of the valve body 10B. Specifically, as shown in Figure 6, the outer peripheral surface cutout portion 11Br in the bleed flow passage modification 1 of the first embodiment extends continuously from the other end side in the axial direction L beyond the region facing the second engagement surface Es2 to the non-engagement surface (outer peripheral surface) that continuously connects the first engagement surface Es1 and the second engagement surface Es2 of the valve body 10B.

[0061] <About the bleed passage> Hereinafter, the bleed flow passage Bc2 in the bleed flow passage modification 1 of the first embodiment will be specifically described along from one end side to the other end side with reference to FIG.

[0062] At one end side, a controlled gap is formed between the first engagement surface Es1 of the valve body 10B (valve seat portion 13) and the first housing groove G1, and at least one slit s of the elastic member Em is arranged, as in the first embodiment. This controlled gap and the slit s form a bleed flow passage Bc2 that is fluidly connected to the bleed flow inlet Bc2i. The bleed flow inlet Bc2i is arranged radially outward of the primary side port 1A when viewed from the axis L direction.

[0063] Next, a relatively large gap is formed between the first housing groove G1 and a non-engagement surface (outer peripheral surface) that continuously connects the first engagement surface Es1 and the second engagement surface Es2 of the valve body 10B. Furthermore, at least one outer peripheral surface cutout portion 11Br extending in the axial direction L is provided on the other end side of the non-engagement surface of the valve body 10B (main body 11B). Therefore, this relatively large gap and the outer peripheral surface cutout portion 11Br form a bleed flow passage Bc2 that is fluidly connected to the inlet Bc2i of the bleed flow.

[0064] At the other end side, the second engagement surface Es2 (outer circumferential surface) of the valve body 10B (main body 11B) is provided with at least one outer circumferential surface cutout portion 11Br (recess) extending in the direction of the axis L. Therefore, the outer circumferential surface cutout portion 11Br provided between the second engagement surface Es2 of the valve body 10B and the second accommodating groove G2 constitutes a bleed flow passage Bc2 that reliably fluidly communicates with the bleed flow outlet Bc2o, thereby eliminating the concern (damming of the bleed flow by a small-diameter annular region).

[0065] As described above, in the pressure regulating valve 100b in the bleed flow path modified example 1 of the first embodiment, similarly to the first embodiment, the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of the bleed flow on the valve body and the pressure-sensing bellows) can be simultaneously eliminated. In addition, in the pressure regulating valve 100b in the bleed flow path modified example 1 of the first embodiment, the outer peripheral surface cutout portion 11Br provided between the second engagement surface Es2 of the valve body 10B and the first housing groove G2 constitutes the bleed flow path Bc2 that reliably fluidly communicates with the outlet Bc2o of the bleed flow, and therefore the concern (damming of the bleed flow by a small-diameter annular region) can be eliminated. Furthermore, in the pressure regulating valve 100b in the bleed flow path variant 1 of the first embodiment, the bleed flow rate can be set to a desired value by appropriately managing the gap between the first engagement surface Es1 (outer peripheral surface) and the first accommodating groove G1, and between the second engagement surface Es2 (outer peripheral surface) and the second accommodating groove G2, and adjusting the flow path area that becomes the bottleneck of the bleed flow path Bc2.

[0066] In the bleed flow passage modification 1 of the first embodiment, the recess is provided in the entire region of the second engagement surface Es2 in the direction of the axis L, but this is not limited thereto. For example, the recess may be provided in the entire region in the direction of the axis L from one end side to the other end side of the valve body 10B, or may be provided only on the first engagement surface Es1 and the second engagement surface Es2, or may be provided only on the first engagement surface Es1.

[0067] (Modification 2 of the bleed flow passage of the first embodiment) A pressure regulating valve 100c in the bleed flow passage modification 2 of the first embodiment will be described with reference to Figs. 7 and 8. The pressure regulating valve 100c in the bleed flow passage modification 2 of the first embodiment differs from the pressure regulating valve 100a of the first embodiment in that a seal member Sm and a communication portion 13Ce are provided on the flange portion 13Cf of the valve seat portion 13C (valve body 10C), but the other configurations are the same as those of the first embodiment. Here, the same components are given the same reference numerals, and duplicated explanations will be omitted. Also, Fig. 7 shows the seal member Sm provided in the outer circumferential groove 13g omitted.

[0068] <Regarding the issue of concern (deviation from actual bleed flow rate)> Here, a concern that the actual bleed flow rate may deviate from the desired bleed flow rate in the pressure regulating valve 100a of the first embodiment will be described with reference to FIG. 4(a).

[0069] In the pressure regulating valve 100a of the first embodiment, the flow path area that becomes the bottleneck of the bleed flow path Bc1 is adjusted to set the bleed flow rate to a desired value.

[0070] Here, the bleed flow passage Bc1 is formed between the outer peripheral surface of the valve body 10 and a fluid path consisting of the first accommodating groove G1 and the second accommodating groove G2. Therefore, even if the outer diameter of the valve body 10 is adjusted and the flow passage area that becomes the bottleneck of the bleed flow passage Bc1 is adjusted so as to obtain a desired bleed flow rate, if the processing error of the first accommodating groove G1 and the second accommodating groove G2 is relatively large, there is a risk that the actual bleed flow rate will deviate significantly from the desired bleed flow rate (hereinafter, referred to as "concern (deviation of actual bleed flow rate)").

[0071] In contrast, in the pressure regulating valve 100c in the bleed flow path modification 2 of the first embodiment, a seal member Sm (support means) (e.g., an O-ring) having an outer diameter larger than that of the flange portion 13Cf is accommodated in the outer circumferential groove 13g in the flange portion 13Cf of the valve seat portion 13C, as shown in Fig. 8. Also, the flange portion 13Cf of the valve seat portion 13C is provided with a communication portion 13Ce penetrating in the direction of the axis L on the radially inner side of the seal member Sm when viewed from the direction of the axis L.

[0072] <About the bleed passage> Hereinafter, the bleed passage Bc3 in the bleed passage modification 2 of the first embodiment will be specifically described along from one end side to the other end side with reference to FIG.

[0073] At one end, the seal member Sm is sandwiched between the first engagement surface Es1 of the valve seat portion 13C and the first accommodation groove G1, and seals between the first engagement surface Es1 and the first accommodation groove G1 while providing the valve body 10C with a sliding resistance against the fluid path, thereby supporting the pressure regulating valve 100c in the fluid path. Thus, the communication portion 13Ce provided in the flange portion 13Cf constitutes a bleed flow passage Bc3 that is fluidly connected to the inlet Bc3i of the bleed flow. The inlet Bc3i of the bleed flow is disposed radially outward of the primary side port 1A as viewed from the axis L direction.

[0074] As a result, the bleed flow path Bc3 always passes through the communication part 13Ce. Therefore, by setting the bottleneck part of the bleed flow path Bc3 to the communication part 13Ce and adjusting the flow path area of ​​the communication part 13Ce, the bleed flow rate can be set to a desired value regardless of the processing error of the first accommodating groove G1, and therefore the concern (deviation from the actual bleed flow rate) can be reliably eliminated.

[0075] Next, a relatively large gap is formed between the first accommodating groove G1 and a non-engagement surface (outer peripheral surface) that continuously connects the first engagement surface Es1 and the second engagement surface Es2 of the valve body 10C, and this relatively large gap forms a bleed flow path Bc3 that is fluidly connected to the bleed flow inlet Bc3i.

[0076] At the other end, a controlled gap is formed between the second engagement surface Es2 (outer peripheral surface) of the valve body 10C (main body 11) and the second accommodating groove G2, and this controlled gap constitutes a bleed flow path Bc3 that is fluidly connected to the bleed flow outlet Bc3o.

[0077] As described above, in the pressure regulating valve 100c in the bleed flow path modified example 2 of the first embodiment, similarly to the first embodiment, it is possible to simultaneously solve the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of the bleed flow on the valve body and the pressure-sensing bellows). Also, in the pressure regulating valve 100c in the bleed flow path modified example 2 of the first embodiment, the bottleneck portion of the bleed flow path Bc3 is set to the communicating part 13Ce, and the flow path area of ​​the communicating part 13Ce is adjusted, so that the bleed flow rate can be set to a desired value regardless of the processing error of the first housing groove G1, and therefore the concern (deviation of the actual bleed flow rate) can be reliably solved.

[0078] In the pressure regulating valve 100c in the bleed flow path variant 2 of the first embodiment, the bottleneck portion of the bleed flow path Bc3 is set in the communicating portion 13Ce. However, this is not limited to the above. For example, the bottleneck portion of the bleed flow path Bc3 may be provided in a portion other than the communicating portion 13Ce, and the communicating portion 13Ce may simply form part of the bleed flow path Bc3.

[0079] Second embodiment A pressure regulating valve 100d according to a second embodiment will be described with reference to Figures 9 and 10. The pressure regulating valve 100d according to the second embodiment differs from the pressure regulating valve 100a of the first embodiment in that a screw-fitting portion having a screw-fitting gap is used as a support means for supporting the valve body 10D relative to the fluid path, instead of an elastic member having a slit. However, the other configurations are substantially the same as those of the pressure regulating valve 100a of the first embodiment. Here, the same components are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0080] 3, in the pressure regulating valve 100a of the first embodiment, an elastic member Em having a slit s is adopted as a support means for supporting the valve body 10 with respect to the fluid path. Therefore, in the pressure regulating valve 100a of the first embodiment, various types of elastic members Em need to be stocked and managed, and the length of the pressure regulating valve 100a in the axial direction L is relatively large. For this reason, there has been a demand for reducing the burden of stock management and reducing the length of the pressure regulating valve in the axial direction L.

[0081] In contrast, as will be described in detail later, the pressure regulating valve 100d of the second embodiment employs a threaded portion having a threaded gap as a support means for supporting the valve body 10D relative to the fluid path, thereby reducing the burden of inventory management and the length in the axial direction L.

[0082] <Installation of pressure regulating valve> First, the shapes of the valve body 10D and the piping block Bf4 will be described with reference to Fig. 10. In Fig. 10, the engagement surfaces of the valve body 10D that engage with the first accommodating groove G1 and the second accommodating groove G2 are labeled with a first engagement surface Es1, a second engagement surface Es2, and a second' engagement surface Es2', which correspond to the numbers of the respective accommodating grooves.

[0083] The valve body 10D (body 11D) is formed with a large diameter portion 11DL and a small diameter portion 11DS (outer peripheral surface) whose outer diameter gradually decreases from one end side to the other end side along the axis L. In addition, a male screw thread portion 11Dsm (support means, screw portion) that is screwed into the piping block Bf4 is formed on the outer peripheral surface of the other end side of the large diameter portion 11DL.

[0084] Next, the piping block Bf4 has an insertion hole along the axis L direction, and a primary side flow path Fp1 and a secondary side flow path Fp2 are formed on one end side and the other end side of this insertion hole along the axis L direction. A first housing groove G1, a second housing groove G2, and a third housing groove G3 are formed in this insertion hole along the axis L direction, in that order, with the diameter gradually decreasing in a stepped manner from one end side to the other end side. In addition, a female thread screwing portion Bscf is formed on the inner peripheral surface on the one end side of the second housing groove G2, and an annular step portion As is formed between the second housing groove G2 and the third housing groove G3, which serves as a positioning means for the pressure regulating valve 100d in the axis L direction. Here, in order to enable the pressure regulating valve 100d to be inserted into the fluid path, the inner diameter of the first housing groove G1 is slightly larger than the outer diameter of the large diameter portion 11DL of the main body 11D, and the inner diameter of the second housing groove G2 is slightly larger than the outer diameters of the small diameter portion 11DS of the bottom plate portion 12 and the main body 11D, so that the gaps are controlled. Furthermore, between the male thread screwing portion 11Dsm of the main body 11D and the female thread screwing portion Bscf of the second housing groove G2, there is a predetermined screwing gap to enable screwing connection.

[0085] <About installation> The operation of mounting the pressure regulating valve 100d to the piping block Bf4 will be described. The pressure regulating valve 100d is inserted from one end side of the primary side flow passage Fp1 along the axis L direction of the piping block Bf4. Then, while screwing the male threaded portion 11Dsm of the main body 11D into the female threaded portion Bscf of the piping block Bf4, the main body 11D is moved toward the other end side in the axis L direction until the outer peripheral edge 12sc (abutment portion) of the spoke portion on the other end side of the bottom plate portion 12 (see the "x" mark in FIG. 9) abuts against the annular step portion As of the piping block Bf4. The pressure regulating valve 100d can be supported in the fluid path by the screwing engagement between the male threaded portion 11Dsm of the main body 11D and the female threaded portion Bscf of the piping block Bf4. Here, as will be described in detail later, the sectorial gap 12a (non-contact portion) extends in the radial direction and does not contact the annular step portion As, forming an outlet Bc4o for the bleed flow. In the attached state of this pressure regulating valve 100d, the primary side port 1A defined in the valve seat portion 13D communicates with the primary side flow path Fp1 to which the primary side pressure P1 is introduced, and the secondary side port 1B defined between the main body 11D and the sectorial gap 12a communicates with the secondary side flow path Fp2 to which the secondary side pressure P2 is introduced.

[0086] <About the bleed passage> Hereinafter, the bleed flow path Bc4 in the second embodiment will be specifically described along from one end side to the other end side with reference to FIG.

[0087] At one end side, a controlled gap is formed between the first engagement surface Es1 corresponding to one end side of the large diameter portion 11DL and the first housing groove G1, as in the first embodiment, and this controlled gap constitutes a bleed flow passage Bc4 fluidly connected to the bleed flow inlet Bc4i. Note that the bleed flow inlet Bc4i is disposed radially outward of the primary side port 1A as viewed from the axis L direction.

[0088] Next, between the second engagement surface Es2 corresponding to the other end side of the large diameter portion 11DL of the main body 11D and the second accommodating groove G2, that is, between the male threaded portion 11Dsm of the main body 11D and the female threaded portion Bscf of the second accommodating groove G2, a predetermined threaded gap is formed to enable threaded connection, and this threaded gap constitutes a bleed flow path Bc4.

[0089] At the other end side, a controlled gap is formed between the second' engagement surface Es2' (outer peripheral surface) corresponding to the other end side of the small diameter portion 11DS and the second housing groove G2, and this controlled gap constitutes a bleed flow passage Bc4 that is fluidly connected to the bleed flow outlet Bc4o. Note that the bleed flow outlet Bc4o does not abut against the annular step portion As, but is disposed in a sectorial gap 12a (non-abutment portion) extending in the radial direction.

[0090] As described above, in the pressure regulating valve 100d of the second embodiment, similarly to the first embodiment, the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of bleed flow on the valve body and pressure-sensing bellows) can be simultaneously solved. In addition, in the pressure regulating valve 100d of the second embodiment, a screw portion having a screw gap is adopted instead of an elastic member having a slit as a support means for supporting the valve body 10D with respect to the fluid path, thereby reducing the burden of inventory management and suppressing the length in the axial direction L compared to the first embodiment. Furthermore, in the pressure regulating valve 100d of the second embodiment, the screw gap between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1, between the second' engagement surface Es2' (outer peripheral surface) and the second housing groove G2, and between the male screw portion 11Dsm and the female screw portion Bscf are appropriately managed, respectively, and the flow path area that becomes a bottleneck of the bleed flow path Bc4 is adjusted, so that the bleed flow rate can be set to a desired value.

[0091] (Bleed passage modification 1 and bleed passage modification 2 of the second embodiment) The pressure regulating valves 100e, 100f in the bleed passage modification 1 and the bleed passage modification 2 of the first embodiment will be described with reference to Fig. 11 and Fig. 12. The pressure regulating valves 100e, 100f in the bleed passage modification 1 and the bleed passage modification 2 of the second embodiment differ from the pressure regulating valve 100d of the second embodiment in that they are provided with a threaded notch portion 11Er and a threaded D cut portion 11Fr (recess) extending in the axis L direction so as to cross the male threaded portions 11Esm, 11Fsm (support means, threaded portion) of the main bodies 11E, 11F, but the other configurations are the same as those of the second embodiment. Here, the same configurations are given the same symbols, and duplicated explanations will be omitted.

[0092] <Regarding concerns (looseness due to screw thread gaps)> Here, a concern regarding the pressure regulating valve 100d of the second embodiment, that is, rattling due to a threaded gap, will be described with reference to FIG.

[0093] In the pressure regulating valve 100d of the second embodiment, the threaded gaps between the first engagement surface Es1 (outer peripheral surface) and the first accommodating groove G1, between the second' engagement surface Es2' (outer peripheral surface) and the second accommodating groove G2, and between the male threaded engagement portion 11Dsm and the female threaded engagement portion Bscf are appropriately managed, and the flow path area that becomes the bottleneck of the bleed flow path Bc4 is adjusted, thereby allowing the bleed flow rate to be set to a desired value.

[0094] Here, for example, when the bottleneck of the bleed flow passage Bc4 is between the second' engagement surface Es2' (outer peripheral surface) and the second housing groove G2, the flow passage area due to the gap between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1 and the flow passage area due to the screwing gap between the male screwing portion 11Dsm and the female screwing portion Bscf must be larger than the flow passage area due to the gap between the second' engagement surface Es2' (outer peripheral surface) and the second housing groove G2. Here, since there is no restriction on the gap between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1, the flow passage area can be relatively easily increased. On the other hand, if the threaded gap between the male threaded portion 11Dsm and the female threaded portion Bscf is set larger than the allowable range, the pressure difference between the primary side pressure P1 and the secondary side pressure P2 may cause rattling at the threaded portion, which may reduce the reliability of the pressure regulating valve (hereinafter referred to as "Concern (rattle due to threaded gap)").

[0095] In contrast, the pressure regulating valves 100e, 100f in the bleed flow path variant 1 and bleed flow path variant 2 of the second embodiment have a thread notch portion 11Er and a thread D-cut portion 11Fr (recess) extending in the axial direction L in the male thread engagement portion 11Esm, 11Fsm, as shown in Figures 11 and 12.

[0096] In the bleed flow passage modification 1 and the bleed flow passage modification 2 of the second embodiment, the male screw threaded portion 11Esm, 11Fsm is formed with a thread notch portion 11Er and a thread D cut portion 11Fr extending in the axial direction L, respectively, so that the flow passage area of ​​the threaded gap can be relatively easily increased and the concern (wobble due to the threaded gap) can be reliably eliminated. As a result, the gap between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1, and between the second' engagement surface Es2' (outer peripheral surface) and the second housing groove G2 can be appropriately controlled, respectively, and the flow passage area that becomes a bottleneck of the bleed flow passage can be adjusted, so that the bleed flow rate can be set to a desired value (see FIG. 10 (second embodiment) since illustration is omitted).

[0097] As described above, in the pressure regulating valves 100e, 100f in the bleed flow path modified example 1 and the bleed flow path modified example 2 of the second embodiment, similar to the second embodiment, it is possible to simultaneously solve the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of the bleed flow on the valve body and the pressure-sensing bellows). Also, in the pressure regulating valves 100e, 100f in the bleed flow path modified example 1 and the bleed flow path modified example 2 of the second embodiment, similar to the second embodiment, a screw portion having a screw gap is used as a support means for supporting the valve body 10E, 10F with respect to the fluid path, thereby reducing the burden of inventory management and suppressing the length in the axis L direction. Furthermore, in the pressure regulating valves 100e, 100f in the bleed flow passage modified example 1 and the bleed flow passage modified example 2 of the second embodiment, the male threaded screwing parts 11Esm, 11Fsm are respectively formed with the thread notch parts 11Er and the thread D cut parts 11Fr extending in the axial direction L, so that the flow passage area of ​​the screwing gap can be relatively easily increased and the concern (wobble due to the screwing gap) can be reliably eliminated. In addition, in the pressure regulating valves 100e, 100f in the bleed flow passage modified example 1 and the bleed flow passage modified example 2 of the second embodiment, the gaps between the first engagement surface Es1 (outer peripheral surface) and the first housing groove G1 and between the second' engagement surface Es2' (outer peripheral surface) and the second housing groove G2 are appropriately managed, respectively, and the flow passage area that becomes the bottleneck of the bleed flow passage can be adjusted, so that the bleed flow rate can be set to a desired value.

[0098] (Modification of the mounting direction of the second embodiment) A pressure regulating valve 100g in a modified mounting direction of the second embodiment will be described with reference to Figures 13 and 14. The pressure regulating valve 100g in the modified mounting direction of the second embodiment differs from the pressure regulating valve 100d of the second embodiment in that it has an mounting direction toward one end side with respect to the piping block Bf5, but the other configurations are the same as those of the second embodiment. Here, the same components are given the same reference numerals, and duplicated explanations will be omitted.

[0099] <Installation of pressure regulating valve> First, the shapes of the valve body 10G and the piping block Bf5 will be described with reference to Fig. 13 and Fig. 14. In Fig. 14, the engagement surface of the valve body 10G that engages with the second accommodating groove G2 is labeled with a second engagement surface Es2 that corresponds to the number of each accommodating groove.

[0100] The valve body 10G (main body 11G) is formed, in order, with a large diameter portion 11GL (outer peripheral surface) whose outer diameter gradually increases from the other end side to the one end side along the axis L direction, a male threaded engagement portion 11Gsm (support means, engagement portion) that is screwed into the piping block Bf5, and a small diameter portion 11GS (outer peripheral surface) whose outer diameter is smaller than that of the large diameter portion 11GL.

[0101] Next, the piping block Bf5 has an insertion hole along the axis L direction, and a primary side flow path Fp1 and a secondary side flow path Fp2 are formed on one end side and the other end side of this insertion hole along the axis L direction. A first housing groove G1, a second housing groove G2, and a third housing groove G3 are formed in this insertion hole along the axis L direction, in that order, with the diameter gradually decreasing in a stepped manner from the other end side to the one end side. Also, a female threaded engagement portion Bscf is formed on the inner peripheral surface on the other end side of the second housing groove G2, and an annular step portion As is formed between the second housing groove G2 and the third housing groove G3, which serves as a positioning means for the pressure regulating valve 100g in the axis L direction. Here, the inner diameter of the first housing groove G1 is slightly larger than the outer diameter of the male screw thread portion 11Gsm, and the inner diameter of the second housing groove G2 is slightly larger than the outer diameter of the small diameter portion 11GS of the main body 11G, so that the pressure regulating valve 100g can be inserted into the fluid path. Furthermore, a predetermined screw thread gap is provided between the male screw thread portion 11Gsm of the main body 11G and the female screw thread portion Bscf of the second housing groove G2 to enable screw thread connection.

[0102] <About installation> The operation of mounting the pressure regulating valve 100g to the piping block Bf5 will be described. The pressure regulating valve 100g is inserted from the other end side of the secondary flow passage Fp2 along the axis L direction of the piping block Bf5. Then, while screwing the male threaded portion 11Gsm of the main body 11G into the female threaded portion Bscf of the piping block Bf5, the valve seat portion 13G is moved toward one end side in the axis L direction until the valve seat portion one end side outer circumferential edge 13Gc (abutment portion) (see the "x" mark in FIG. 13) of the valve seat portion 13G abuts against the annular step portion As of the piping block Bf5. The pressure regulating valve 100g can be supported in the fluid path by the screw engagement between the male threaded portion 11Gsm of the main body 11G and the female threaded portion Bscf of the piping block Bf5. Here, the radial cutout portion 13Gr (non-contact portion), which will be described in detail later, extends in the radial direction and is used as the rotary tool insertion portion 13d before shipping, and does not contact the annular step portion As to form the inlet Bc5i of the bleed flow. In the mounted state of this pressure regulating valve 100g, the primary side port 1A defined in the valve seat portion 13G communicates with the primary side flow path Fp1 to which the primary side pressure P1 is introduced, and the secondary side port 1B defined between the main body 11G and the sectorial gap 12a communicates with the secondary side flow path Fp2 to which the secondary side pressure P2 is introduced. In this way, the pressure regulating valve 100g increases the degree of freedom of the mounting direction with respect to the piping block Bf5, and therefore the conventional problem 1 (inapplicability to piping blocks) can be more reliably solved.

[0103] <About the bleed passage> Hereinafter, the bleed flow passage Bc5 in the modified mounting direction of the second embodiment will be specifically described from one end side to the other end side with reference to FIG.

[0104] At one end side, a relatively large gap is formed between the small diameter portion 11GS and the second housing groove G2, and this relatively large gap constitutes a bleed flow passage Bc5 that is fluidly connected to the bleed flow inlet Bc5i. The bleed flow inlet Bc5i does not abut against the annular step portion As and is disposed in a radial cutout portion 13Gr (non-abutment portion) that extends in the radial direction. The bleed flow inlet Bc5i is disposed radially outward of the primary side port 1A as viewed from the axis L direction.

[0105] Next, between the second engagement surface Es2 of the main body 11G and the second accommodating groove G2, that is, between the male threaded portion 11Gsm of the main body 11G and the female threaded portion Bscf of the second accommodating groove G2, a predetermined threaded gap is formed to enable threaded connection, and this threaded gap constitutes a bleed flow path Bc5.

[0106] At the other end side, a relatively large gap is formed between the large diameter portion 11GL and the second accommodating groove G2 and the first accommodating groove G1, and this relatively large gap forms a bleed flow passage Bc5 that is fluidly connected to the bleed flow outlet Bc5o.

[0107] As described above, in the pressure regulating valve 100g in the mounting direction modification of the second embodiment, similar to the second embodiment, the conventional problem 1 (inapplicability to piping blocks) and the conventional problem 2 (adverse effects of bleed flow on the valve body and pressure-sensing bellows) can be simultaneously solved. In addition, in the pressure regulating valve 100g in the mounting direction modification of the second embodiment, similar to the second embodiment, a screw part having a screw gap is adopted as a support means for supporting the valve body 10G with respect to the fluid path, thereby reducing the burden of inventory management and suppressing the length in the axis L direction compared to the first embodiment. Furthermore, the pressure regulating valve 100g in the mounting direction modification of the second embodiment increases the degree of freedom of the mounting direction with respect to the piping block Bf5, so that the conventional problem 1 (inapplicability to piping blocks) can be solved more reliably. In addition, in the pressure regulating valve 100g in the mounting direction modified example of the second embodiment, the threaded gaps between the small diameter portion 11GS (outer peripheral surface) and the second accommodating groove G2, between the second engagement surface Es2 (outer peripheral surface) and the second accommodating groove G2, and between the male threaded portion 11Gsm and the female threaded portion Bscf are appropriately managed, and the flow path area that becomes the bottleneck of the bleed flow path Bc5 is adjusted, so that the bleed flow rate can be set to a desired value.

[0108] <Other> In the present embodiment (first embodiment, bleed flow path modification 1 of the first embodiment, bleed flow path modification 2 of the first embodiment, second embodiment, bleed flow path modification 1 of the second embodiment, bleed flow path modification 2 of the second embodiment, and mounting direction modification of the second embodiment), the shapes of the valve body and the piping block have been described by taking as an example a case where a straight flow path is adopted in the piping block, but the present invention is not limited to this. As long as the piping block has an insertion hole and the outer diameter of the valve body has a slight gap that allows the valve body to be inserted into the insertion hole, any shape may be used. For example, when an L-shaped flow path is adopted in the piping block, a bottom plate having a disk shape may be used to close the other end side of the body, and a horizontal hole that defines the secondary side port 1B may be provided in the side of the body, so that the fluid flows in an L-shape from the primary side port 1A to the secondary side port 1B in the pressure regulating valve. In this case, like the straight flow path, the bleed flow path is formed in the gap between the outer peripheral surface of the valve body and the fluid path, so that it is possible to simultaneously solve both conventional problem 1 (inapplicability to piping blocks) and conventional problem 2 (adverse effects of the bleed flow on the valve body and pressure-sensing bellows).

[0109] In the pressure regulating valve 100b in the bleed flow passage modification 1 of the first embodiment, at least one outer peripheral surface cutout portion 11Br (recess) extending in the axial direction L is adopted on the outer peripheral surface forming the bleed flow passage Bc2 of the valve main body 10B (main body 11B), but is not limited thereto. For example, in the bleed flow passage modification 2 of the first embodiment, the second embodiment, the bleed flow passage modification 1 of the second embodiment, the bleed flow passage modification 2 of the second embodiment, and the mounting direction modification of the second embodiment, at least one outer peripheral surface cutout portion (recess) extending in the axial direction L may be adopted on the outer peripheral surface forming the bleed flow passage of the valve main body.

[0110] In the pressure regulating valves 100e, 100f in the bleed flow passage modified example 1 and the bleed flow passage modified example 2 of the first embodiment, the male screw engagement part 11Dsm, 11Fsm employs a thread notch part 11Er and a thread D cut part 11Fr (recess) extending in the axial direction L, but is not limited thereto. For example, in the mounting direction modified example of the second embodiment, the male screw engagement part 11Gsm may employ a thread notch part and a thread D cut part (recess) extending in the axial direction L.

[0111] It goes without saying that the pressure regulating valves 100a to 100g 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]

[0112] 100a~100g Pressure Regulating Valve 1A Primary Port 1B Secondary port 10, 10B, 10C, 10D, 10G Valve body 11, 11B, 11D, 11E, 11F, 11G Main unit 11Br Outer surface cutout (recess) 11d One end 11DL, 11GL, 11EL, 11FL, 11GL Large diameter section (outer periphery) 11DS,11GS,11ES,11FS,11GS Small diameter part (outer surface) 11Dsm, 11Esm, 11Fsm, 11Gsm Male thread threaded part (support means, threaded part) 11Er Thread notch (recess) 11Fr Thread D-cut section (recess) 11u other end 12 Bottom plate part 12a Fan-shaped gap (non-contact area) 12o opening 12s spokes 12sc Outer rim of the other end of the spoke (contact part) 13,13C,13D,13G Valve seat part 13a Valve seat 13b Inner surface 13Ce communication part 13d Pair of rotary tool inserts 13f, 13Cf Flange part 13g Outer circumferential groove 13Gc One end outer periphery of the valve seat (contact part) 13Gr Radial cutout (non-contact part) 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 (biasing means) 42 Adjustment screw 42a Body side adjustment screw 42b Valve seat side adjustment screw 50 Pressure-sensing bellows unit 51 Pressure-sensitive bellows (biasing means) 52 Fixture 52a Boss part 70 Sliding contact member 71 Circular ring fixing part 72 Legs 73 Curved Section A Containment Room As Annular step Bc1,Bc2,Bc3,Bc4,Bc5 Bleed channels Bc1i,Bc2i,Bc3i,Bc4i,Bc5i Bleed flow inlet Bc1o, Bc2o, Bc3o, Bc4o, Bc5o Bleed flow outlet Bf1, Bf4, Bf5 Piping Block Bscf female threaded joint Cr Crimping part Em Elastic member (support means) Es1 1st engagement surface (outer surface) Es2 2nd engagement surface (outer surface) Es2' 2nd' engagement surface (outer surface) Fp1 Primary flow path Fp2 Secondary flow path G1 First Receiving Groove G2 Second Receiving Groove G3 3rd Receiving Groove L axis P1 Primary pressure P2 Secondary pressure s slit Sm Sealing member (supporting means) W Welding

Claims

1. A pressure regulating valve that is inserted into a fluid path, a valve body having a cylindrical shape and including a primary port, a secondary port, and a valve seat; a valve body that moves in an axial direction and seats on or leaves the valve seat; a biasing means for biasing the valve body toward the valve seat; Equipped with The valve body and the biasing means are disposed within the valve body, a bleed passage that constantly connects the primary side port and the secondary side port, the bleed passage being formed by a gap between an outer circumferential surface of the valve body and the fluid path.

2. 2. The pressure regulating valve according to claim 1, wherein the inlet of the bleed flow passage is disposed radially outward of the primary side port when viewed in the axial direction.

3. The outer peripheral surface of the valve body has at least one recess extending in the axial direction, The pressure regulating valve according to claim 1 , wherein the bleed passage includes the recess.

4. a support means for supporting the valve body relative to the fluid path on an outer circumferential surface of the valve body; 2. The pressure regulating valve according to claim 1, wherein the bleed passage is provided in the support means.

5. The support means is an elastic member disposed between the valve body and the fluid path, 5. The pressure regulating valve according to claim 4, wherein the bleed passage includes at least one slit and / or a through hole formed in the elastic member.

6. the support means is a threaded portion having a threaded gap between the support means and the fluid path, The pressure regulating valve according to claim 4 , wherein the bleed passage includes the threaded gap.

7. The threaded portion has at least one recess extending in an axial direction, The pressure regulating valve according to claim 6 , wherein the bleed passage includes the recess of the threaded portion.

8. a support means for supporting the valve body relative to the fluid path on an outer circumferential surface of the valve body; the support means is a seal member that seals between the flange portion of the valve body and the fluid path, a flange portion of the valve body is provided with a communication portion penetrating in the axial direction on a radially inner side of the seal member when viewed from the axial direction, The pressure regulating valve according to claim 1 , wherein the bleed passage includes the communication portion.

9. The other end or the one end of the valve body has an abutment portion that abuts against the annular step portion of the fluid path and a non-abutment portion that extends in a radial direction without abutting against the annular step portion of the fluid path, The pressure regulating valve according to claim 1 , wherein the bleed passage includes the non-contact portion.

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