Pressure adjusting valve

Abstract

The invention provides a pressure adjusting valve which is extremely high in versatility, can be introduced into a discharge flow path at low cost, and can form the discharge flow path capable of suppressing the generation of vibration and noise and remarkably improving responsiveness when the valve is opened. A pressure adjustment valve (100a) is inserted into a fluid path, and is provided with: a cylindrical valve body (10) having a primary port (1A), a secondary port (1B), and a valve seat (13a); a valve body (20) that moves in the direction of the axis (L) and is seated on or separated from the valve seat (13a); and urging means (41, 51) for urging the valve body (20) toward the valve seat (13a), the valve body (20) and the urging means (41, 51) being disposed within the valve body (10), and a discharge flow path (Bc1) which constantly connects the primary port (1A) and the secondary port (1B) being configured from the outer peripheral surface of the valve body (10) and a gap between the fluid path.

Description

Technical Field

[0001] The present invention relates to a pressure regulating valve, which adopts a single-tube type in which a valve core and a pressure-sensing bellows are housed in a valve body, and a discharge flow path is formed on the outer peripheral surface of the valve body. Background Art

[0002] The pressure regulating valve is preferably installed in a flow path formed in a piping block for various piping paths, particularly for weight reduction and space saving, depending on the user's application.

[0003] Here, for example, in Patent Document 1, Fig.15 As shown in the figure, a pressure regulating valve 1500 (hereinafter referred to as "conventional pressure regulating valve") is described, which includes: a valve body 1510 having a primary port 1501A, a secondary port 1501B and a valve seat 1513a; and a valve core 1520 seated on or separated from the valve seat 1513a. In addition, Patent Document 1 describes that the pressure regulating valve further includes: a sliding unit 1530 that supports the sliding of the valve core 1520 in the direction of the axis L; an adjustment spring unit 1540 that adjusts the urging force of the valve spring 1541 via an adjustment screw member 1542; a pressure sensing bellows unit 1550 having a pressure sensing bellows 1551; and an elastic member 1570 that abuts against the inner peripheral surface 1513b.

[0004] However, the existing pressure regulating valve 1500 has a piping connection between the primary side piping and the secondary side piping via a large diameter flange, etc., and therefore cannot be applied to the flow path within the piping block, etc., and there is a concern that the versatility will become extremely low (hereinafter referred to as "existing problem 1 (cannot be applied to piping blocks)").

[0005] In addition, depending on the application, the pressure regulating valve needs to be assembled into a fluid circuit that allows the fluid to flow continuously without being blocked, or needs to avoid vibration of the valve core when the valve is opened in an environment where the pressure difference between the primary side pressure P1 and the secondary side pressure P2 is large. Therefore, it is desirable for the pressure regulating valve to have a discharge flow path that allows the primary side port and the secondary side port to be always fluidically connected even in the closed valve state.

[0006] In Patent Document 1 (particularly refer to paragraphs 0053 and Figure 1) describes a conventional pressure regulating valve 1500, in which a bleed hole 1520a is formed in a valve core 1520 (or a valve body 1510) as a bleed flow path Bc15. However, in the conventional pressure regulating valve 1500, when the bleed hole 1520a is formed in the valve core 1520 (or the valve body 1510), in a closed valve state, the bleed flow passing through the bleed flow path Bc15 collides with the valve core 1520 itself or the pressure-sensing bellows 1551 for controlling the valve core opening in a turbulent state, and therefore, there is a concern that vibration or noise may be generated, or the responsiveness when the valve is opened may be reduced (hereinafter referred to as "conventional problem 2 (adverse effects of the bleed flow on the valve core and the pressure-sensing bellows)").

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2020-16290 Summary of the invention

[0010] Problems to be solved by the invention

[0011] An object of the present invention is to provide a pressure regulating valve having extremely high versatility, capable of introducing a bleed flow path at low cost, and capable of forming a bleed flow path capable of suppressing the generation of vibration and noise and significantly improving the responsiveness when the valve is opened.

[0012] Technical solutions to solve problems

[0013] In order to solve the above-mentioned problems, a pressure regulating valve inserted in a fluid path comprises: a valve body, which has a cylindrical shape and has a primary port, a secondary port and a valve seat; a valve core, which moves along the axial direction and is seated or separated relative to the above-mentioned valve seat; and a force-applying unit, which applies force to the above-mentioned valve core toward the above-mentioned valve seat, and the above-mentioned valve core and the above-mentioned force-applying unit are arranged in the above-mentioned valve body, and a discharge flow path in which the above-mentioned primary port and the above-mentioned secondary port are always connected is formed by a gap between the outer peripheral surface of the above-mentioned valve body and the above-mentioned fluid path.

[0014] Furthermore, in the pressure regulating valve, the inlet of the discharge flow path may be arranged radially outward of the primary port when viewed in the axial direction.

[0015] Furthermore, in the pressure regulating valve, the outer peripheral surface of the valve body may have at least one recessed portion extending in the axial direction, and the drain flow path may include the recessed portion.

[0016] In the pressure regulating valve, a support unit for supporting the valve body with respect to the fluid path may be further provided on an outer peripheral surface of the valve body, and the drain flow path may be provided in the support unit.

[0017] Furthermore, in the pressure regulating valve, the support means may be formed of an elastic member disposed between the valve body and the fluid path, and the discharge flow path may include at least one slit and / or through hole included in the elastic member.

[0018] Furthermore, in the pressure regulating valve, the support unit may be composed of a threaded portion having a threaded clearance between the support unit and the fluid path, and the drain flow path may include the threaded clearance.

[0019] Furthermore, in the pressure regulating valve, the threaded portion may include at least one recessed portion extending in the axial direction, and the drain flow path may include the recessed portion of the threaded portion.

[0020] In addition, in the above-mentioned pressure regulating valve, a supporting unit for supporting the above-mentioned valve body relative to the above-mentioned fluid path may be further provided on the outer peripheral surface of the above-mentioned valve body, and the above-mentioned supporting unit is composed of a sealing component for sealing the flange portion of the above-mentioned valve body and the above-mentioned fluid path. When viewed from the axial direction, the flange portion of the above-mentioned valve body is provided with a connecting portion penetrating in the axial direction on the inner side in the radial direction of the above-mentioned sealing component, and the above-mentioned discharge flow path includes the above-mentioned connecting portion.

[0021] In addition, in the above-mentioned pressure regulating valve, the other end or one end of the above-mentioned valve body may also have an abutment portion that abuts against the annular step portion of the above-mentioned fluid path and a non-abutment portion that does not abut against the annular step portion of the above-mentioned fluid path and extends in the radial direction, and the above-mentioned discharge flow path includes the above-mentioned non-abutment portion.

[0022] Effects of the Invention

[0023] According to the present invention, a pressure regulating valve can be provided which has extremely high versatility, can introduce a bleed flow path at low cost, and can form a bleed flow path which can suppress the generation of vibration and noise and significantly improve the responsiveness when opening the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 These are explanatory diagrams showing a pressure regulating valve according to a first embodiment of the present invention, wherein (a) is a longitudinal sectional view and (b) is a plan view.

[0025] Figure 2 yes Figure 1 An upper perspective view of the pressure regulating valve is shown.

[0026] Figure 3 It means that Figure 1 The pressure regulating valve shown is a cross-sectional view of a state in which it is mounted on a piping block.

[0027] Figure 4 Yes means Figure 3 The diagrams for explaining the use of the pressure regulating valve shown in the figure show that (a) shows a closed valve state and (b) shows an open valve state.

[0028] Figure 5 1 is an explanatory diagram of a pressure regulating valve in a first embodiment of a modified example of a discharge flow path, (a) is an upper perspective view (with Figure 2 (b) is a top view (corresponding to Figure 1 (b) Corresponding figure).

[0029] Figure 6 It means that Figure 5 A cross-sectional view of a pressure regulating valve installed in a piping block (with Figure 4 (a) Corresponding figure).

[0030] Figure 7 1 and 2 are explanatory diagrams of a pressure regulating valve in a second modification of the discharge flow path of the first embodiment, wherein (a) is an upper perspective view and (b) is a plan view.

[0031] Figure 8 It means that Figure 7 The pressure regulating valve shown is a cross-sectional view of a state in which it is mounted on a piping block.

[0032] Fig. 9 1 and 2 are explanatory diagrams showing a pressure regulating valve according to a second embodiment, wherein (a) is an upper perspective view and (b) is a plan view.

[0033] Fig.10 It means that Fig. 9 The pressure regulating valve shown is a cross-sectional view of a state in which it is mounted on a piping block.

[0034] Fig.11 1 and 2 are explanatory diagrams of a pressure regulating valve in a first modification of a discharge flow path according to a second embodiment, wherein (a) is an upper perspective view and (b) is a plan view.

[0035] Fig.12 1 and 2 are explanatory diagrams of a pressure regulating valve in a second modification of a discharge flow path according to the second embodiment, wherein (a) is an upper perspective view and (b) is a plan view.

[0036] Fig.13 1 and 2 are explanatory diagrams of a pressure regulating valve in a modification of the mounting direction of the second embodiment, wherein (a) is a bottom perspective view and (b) is a bottom view of a valve seat portion.

[0037] Fig.14 It means that Fig.13 The pressure regulating valve shown is a cross-sectional view of a state in which it is mounted on a piping block.

[0038] Fig.15 It is a cross-sectional view showing a pressure regulating valve according to the prior art.

[0039] In the figure:

[0040] 100a~100g—pressure regulating valve, 1A—primary port, 1B—secondary port, 10, 10B, 10C, 10D, 10G—valve body, 11, 11B, 11D, 11E, 11F, 11G—body, 11Br—outer peripheral surface cutout portion (recessed portion), 11d—one end portion, 11DL, 11GL, 11EL, 11FL, 11GL—large diameter portion (outer peripheral surface), 11DS, 11GS, 11ES, 11FS, 11GS—small diameter portion (outer peripheral surface), 11Dsm, 11Esm, 11Fsm, 11Gsm—external thread threaded joint portion (support unit, threaded joint portion), 11Er—threaded cutout portion ( concave portion), 11Fr—thread D cutting portion (concave portion), 11u—other end portion, 12—bottom plate portion, 12a—sector-shaped gap (non-contact portion), 12o—opening portion, 12s—spoke portion, 12sc—outer peripheral edge of the other end side of the spoke portion (contact portion), 13, 13C, 13D, 13G—valve seat portion, 13a—valve seat, 13b—inner peripheral surface, 13Ce—connecting portion, 13d—a pair of rotating tool insertion portions, 13f, 13Cf—flange portion, 13g—outer peripheral groove, 13Gc—outer peripheral edge of one end side of the valve seat portion (contact portion), 13Gr—radial direction cutout portion (non-contact portion), 20—valve core, 21—valve portion, 22—protrusion, 30—sliding unit , 31—cylinder member, 32—connecting member, 33—piston member, 40—adjustment spring unit, 41—valve spring (force unit), 42—adjustment threaded portion, 42a—main body side adjustment threaded portion, 42b—valve seat side adjustment threaded portion, 50—pressure sensing bellows unit, 51—pressure sensing bellows (force unit), 52—fixed metal accessories, 52a—protrusion, 70—sliding contact member, 71—circular fixing portion, 72—foot, 73—bend portion, A—accommodation chamber, As—annular step portion, Bc1, Bc2, Bc3, Bc4, Bc5—drainage flow path, Bc1i, Bc2i, Bc3i, Bc4i, Bc5i—drainage flow Inlet, Bc1o, Bc2o, Bc3o, Bc4o, Bc5o—outlet for discharge flow, Bf1, Bf4, Bf5—piping block, Bscf—internal threaded joint, Cr—riveted portion, Em—elastic component (support unit), Es1—first engaging surface (outer peripheral surface), Es2—second engaging surface (outer peripheral surface), Es2'—second' engaging surface (outer peripheral surface), Fp1—primary side flow path, Fp2—secondary side flow path, G1—first accommodating groove, G2—second accommodating groove, G3—third accommodating groove, L—axis line, P1—primary side pressure, P2—secondary side pressure, s—slit, Sm—sealing component (support unit), W—welding portion. DETAILED DESCRIPTION

[0041] Reference Figure 1 to Figure 14 , the embodiment of the present invention is described in detail. However, the present invention is not limited to the scheme of this embodiment.

[0042] <About Terminology>

[0043] In this specification and the scope of the invention, “left”, “right”, “upper” and “lower” mean Figure 1 (a) Figure 3 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.14 In the description of this specification and the scope of protection of the invention, "one end" and "the other end" mean the "lower end" and "upper end" on the drawing. In the description of this specification and the scope of protection of the invention, "the effective pressure-bearing area of ​​the pressure-sensing bellows" means the pressure-bearing area calculated as an approximate value based on the average diameter of the minimum inner diameter of the corrugation shape (the inner diameter of the "valley" part of the corrugation shape of the pressure-sensing bellows protruding toward the central axis side) and the maximum outer diameter (the outer diameter of the "peak" part of the corrugation shape of the pressure-sensing bellows protruding in the direction away from the central axis side). In the description of this specification and the scope of protection of the invention, "the force-applying member" means "a member that applies force to the valve core toward the valve seat (such as a valve spring or a pressure-sensing bellows)". In the description of this specification and the scope of protection of the invention, "the discharge flow path" means "a flow path that always connects the primary port and the secondary port to the fluid even in the closed valve state". In the description of this specification and the scope of protection of the invention, "the support unit" means "a unit that supports the valve body relative to the fluid path". In the present specification and the scope of protection of the invention, "extending in the axial direction" means "extending in parallel with the axial direction and also extending in the axial direction at a predetermined angle in the axial direction".

[0044] (First Embodiment)

[0045] <About the structure of the pressure regulating valve>

[0046] use Figure 1 and Figure 2 , the pressure regulating valve 100a according to the first embodiment of the present invention is described. Figure 2The elastic member Em is omitted, and the elastic member Em is provided in the outer peripheral groove 13g and has a slit s. The pressure regulating valve 100a is mainly composed of a valve body 10, a valve core 20, a sliding unit 30, an adjustment spring unit 40, a pressure-sensing bellows unit 50, and a sliding contact member 70. Hereinafter, each structure of the pressure regulating valve 100a will be described in turn. In addition, a high-pressure primary-side pressure P1 is introduced to the primary-side port 1A, and on the other hand, a low-pressure secondary-side pressure P2 is introduced to the secondary-side port 1B.

[0047] Here, the details will be described later, but the pressure regulating valve 100a of the first embodiment adopts a single-tube type in which all the components (valve core 20, pressure sensing bellows 51, etc.) are housed in the valve body 10, and the pressure regulating valve 100a is inserted into the fluid path, and a discharge flow path Bc1 is formed in the gap between the outer peripheral surface of the valve body 10 and the fluid path (see Figure 4 (a)). Thus, the pressure regulating valve 100a of the first embodiment can simultaneously eliminate the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve core and the pressure sensing bellows). As a result, the pressure regulating valve 100a of the first embodiment has extremely high versatility, can introduce the discharge flow path Bc1 at a low cost, and can suppress the generation of vibration and noise, thereby significantly improving the responsiveness when opening the valve.

[0048] The valve body 10 is made of a metal such as stainless steel or aluminum alloy, and includes: a main body 11 having a cylindrical shape; a bottom plate portion 12 having a plurality of fan-shaped gaps 12a when viewed from the axis L; and a valve seat portion 13 having a substantially cylindrical shape and being formed separately from the main body 11. In the first embodiment, the main body 11 and the bottom plate portion 12 are described as separate bodies, but the invention is not limited thereto. For example, the main body 11 and the bottom plate portion 12 may also be formed integrally.

[0049] The main body 11 has a valve seat 13 screwed to one end thereof and a bottom plate 12 welded to the other end thereof, thereby defining an accommodation chamber A inside thereof and defining a secondary port 1B between the main body 11 and the fan-shaped gap 12 a.

[0050] like Figure 1 (b) and Figure 2 As shown, the bottom plate 12 includes a plurality of (for example, three) spokes 12s extending in the radial direction and an opening 12o opening coaxially with the axis L, and a plurality of fan-shaped gaps 12a for dividing the secondary port 1B are formed between the plurality of spokes 12s. The outer peripheral edge of one end of the spoke 12s is fixed to the outer peripheral edge of the other end 11u of the body 11 via a weld W formed by spot welding or the like.

[0051] The valve seat portion 13 includes an annular valve seat 13a, an inner peripheral surface 13b that divides the primary port 1A, a pair of rotating tool insertion portions 13d formed on one end surface and arranged at symmetrical positions across the axis L, a flange portion 13f provided on one end side, and an outer peripheral groove 13g provided on the outer peripheral surface of the flange portion 13f. The details will be described later, but the outer peripheral groove 13g contains an elastic member Em (supporting means) (for example, a cut O-ring, an O-ring with a through hole, a C-shaped ring having elastic force in the radial direction, etc.), the elastic member Em has an outer diameter larger than that of the flange portion 13f, and has at least one slit s or / and through hole extending in the direction of the axis L. In addition, the at least one slit s or / and through hole extending in the direction of the axis L is in a state where the fluid in the direction of the axis L can be communicated even when the pressure regulating valve 100a is inserted in the fluid path.

[0052] The valve element 20 is made of metal such as stainless steel or phosphor bronze and has a substantially disk shape. The valve element 20 includes an annular valve portion 21 and a boss portion 22 that protrudes coaxially with the axis L toward one end.

[0053] The valve portion 21 has an outer diameter larger than that of the valve seat 13 a , and is seated on or separated from the valve seat 13 a by moving in the direction of the axis L. The boss 22 is fitted into an opening of the sliding contact member 70 .

[0054] The slide unit 30 includes: a cylindrical cylinder member 31 fixed to the valve core 20 at one end; a connecting member 32 abutting against a fixed metal fitting 52 at the other end by the urging force of the valve spring 41; and a piston member 33, the other end of which is fixed by riveting to the connecting member 32 and one end of which is supported by the cylinder member 31 so as to be able to move forward and backward, and the slide unit 30 is provided inside the pressure sensing bellows 51. Here, the valve spring 41 is clamped between the cylinder member 31 and the connecting member 32 in a pressed state. Therefore, the slide unit 30 transmits the urging force of the valve spring 41 to the pressure sensing bellows 51, so that the pressure sensing bellows 51 is urged in the extension direction along the axis L.

[0055] The adjustment spring unit 40 includes a valve spring 41 (biasing unit) as a compression spring and an adjustment threaded portion 42 that adjusts the biasing force on the valve element 20 by expanding and contracting the valve spring 41 and the pressure sensing bellows 51 .

[0056] The adjusting threaded portion 42 is composed of a main body side adjusting threaded portion 42a and a valve seat side adjusting threaded portion 42b, which are separate bodies, and the main body side adjusting threaded portion 42a and the valve seat side adjusting threaded portion 42b are threadedly connected to each other. The main body side adjusting threaded portion 42a is formed on the inner peripheral surface of one end side of the main body 11, and the valve seat side adjusting threaded portion 42b is formed on the outer peripheral surface of the other end side of the valve seat portion 13. Here, the force adjustment unit for the valve core 20 is engaged with the adjustment jig and the pair of rotating tool insertion portions 13d before shipment, and the valve seat portion 13 is rotated relative to the main body 11 via the adjusting threaded portion 42 to move in the direction of the axis L. In this way, the expansion and contraction of the valve spring 41 and the pressure-sensing bellows 51, that is, the force acting on the valve core 20 can be adjusted to open the valve at a desired valve opening pressure setting value. Furthermore, a welding portion W is provided, which fixes the middle portion of the valve seat portion 13 and the one end portion 11d of the main body 11 to each other by welding or the like from the radially outer side in a state where the valve core 20 applies force to the valve seat portion 13 after the force applied to the valve core 20 is adjusted by the force adjustment unit. At this time, between the outer peripheral surface of the middle portion of the valve seat portion 13 and the inner peripheral surface of the one end portion 11d of the main body 11, the welding portion W is provided in an annular shape without a gap when viewed from the radially outer side, and therefore, a discharge flow path that always connects the primary port 1A and the secondary port 1B via the gap between the valve seat portion 13 and the main body 11 is not formed.

[0057] The pressure sensing bellows unit 50 is made of metal such as stainless steel or phosphor bronze and includes a pressure sensing bellows 51 (biasing unit) formed into a bellows shape extending in the axis L direction by press forming and a fixing metal fitting 52 having a substantially disk shape.

[0058] One end of the pressure sensing bellows 51 is welded and fixed to the other end surface of the outer circumference of the valve body 20 , and the other end is welded and fixed to one end surface of the outer circumference of the fixing metal fitting 52 , and the interior of the pressure sensing bellows 51 is sealed.

[0059] Here, the effective pressure-receiving area of ​​the pressure-sensing bellows 51 is set to be consistent with the pressure-receiving area of ​​the valve core 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 core 20 are offset by the secondary side pressure P2. Therefore, the valve core 20 is not affected by the secondary side pressure P2, and the opening of the valve core 20 can be variably controlled according to the change of the primary side pressure P1. In addition, the pressure-receiving area (effective pressure-receiving area) calculated as an approximate value based on the average inner diameter of the minimum inner diameter and the maximum inner diameter of the corrugated shape can also be used to set the dimensions of each part of the pressure regulating valve 100a using the actual pressure-receiving area obtained through experiments.

[0060] In addition, the fixing metal fitting 52 has a protrusion 52a protruding toward the other end side coaxially with the axis L. After the protrusion 52a is fitted into the opening 12o of the bottom plate 12, it is riveted to form a rivet portion Cr and fixed to the bottom plate 12, i.e., the valve body 10.

[0061] The sliding contact member 70 is made of a metal such as stainless steel or phosphor bronze, and is obtained by stamping a thin and elastic member. In addition, the sliding contact member 70 includes: a circular ring fixing portion 71 having an opening coaxially with the axis L; a plurality of leg portions 72 connected to the outer peripheral side of the circular ring fixing portion 71, extending toward one end side in the direction of the axis L, and arranged on the same circumference as viewed from the direction of the axis L (in the example, eight leg portions are arranged at equal intervals on the same circumference); and a curved portion 73 formed between one end side and the other end side of the leg portion 72 and having a convex shape relative to the inner peripheral surface 13b of the valve seat portion 13. After the protrusion 22 is fitted into the opening of the sliding contact member 70, the sliding contact member 70 is joined to the valve core 20 via a welded portion (not shown) formed by spot welding or the like. Furthermore, since the curved portion 73 has a convex shape with respect to the inner peripheral surface 13 b of the valve seat portion 13 , the curved portion 73 is in sliding contact with the inner peripheral surface 13 b of the valve seat portion 13 in substantially point contact.

[0062] <About installation of pressure regulating valve>

[0063] First, use Figure 2 and Figure 3 , the shapes of the valve body 10 and the piping block Bf1 are described. Figure 3 In FIG. 1 , the engaging surfaces of the valve body 10 that engage with the first accommodating groove G1 and the second accommodating groove G2 are denoted by first engaging surface Es1 and second engaging surface Es2 corresponding to the numbers of the respective accommodating grooves.

[0064] like Figure 2 As shown in FIG. 1 , the valve body 10 has the same outer diameter from one end side to the other end side, and the outer diameter of the flange portion 13f of the valve seat portion 13 fixed to one end side of the body 11 is set larger than the outer diameters of the body 11 and the bottom plate portion 12. An elastic member Em is accommodated in an outer peripheral groove 13g provided on the outer peripheral surface of the flange portion 13f. The elastic member Em has an outer diameter larger than that of the flange portion 13f and has at least one slit s extending in the direction of the axis L (see FIG. 1 ). Figure 3 ).

[0065] Then, if Figure 3As shown, the piping block Bf1 has an insertion hole along the axis L, and a primary flow path Fp1 and a secondary flow path Fp2 are formed at one end and the other end of the insertion hole. In the insertion hole along the axis L, a first receiving groove G1 and a second receiving groove G2 are sequentially formed, which are reduced in diameter in a step-like manner from one end to the other end. Here, the inner diameter of the first receiving groove G1 is managed to be slightly larger than the outer diameter of the flange portion 13f of the valve seat portion 13 by clearance, and the inner diameter of the second receiving groove G2 is managed to be slightly larger than the outer diameter of the bottom plate portion 12 and the main body 11 by clearance, so that the pressure regulating valve 100a can be inserted into the fluid path.

[0066] <About installation operation>

[0067] The installation operation of the pressure regulating valve 100a to the piping block Bf1 is described. The pressure regulating valve 100a is inserted from one end side of the primary flow path Fp1 of the piping block Bf1 along the axis L direction. Then, the valve body 10 is moved to the other end side in the axis L direction to a desired position while the first engaging surface Es1 is slid along the first receiving groove G1 of the piping block Bf1 and the second engaging surface Es2 of the valve body 10 is slid along the second receiving groove G2 of the piping block Bf1. In the installed state of the pressure regulating valve 100a, the primary port 1A defined in the valve seat portion 13 is connected to the primary flow path Fp1 for introducing the primary pressure P1, and the secondary port 1B defined between the body 11 and the fan-shaped gap 12a is connected to the secondary flow path Fp2 for introducing the secondary pressure P2. At this time, an elastic component Em having at least one slit s is sandwiched between the outer peripheral groove 13g of the flange portion 13f of the main body 11 and the first accommodating groove G1, thereby imparting sliding resistance to the valve body 10 relative to the fluid path. As a result, the pressure regulating valve 100a can be supported in the fluid path.

[0068] <About the operation of the pressure regulating valve>

[0069] use Figure 4 , the operation of the pressure regulating valve 100a is described. Here, in the pressure regulating valve 100a, a high-pressure primary pressure P1 is introduced to the primary port 1A, and a low-pressure secondary pressure P2 is introduced to the secondary port 1B. Here, the plurality of curved portions 73 of the sliding contact member 70 are pressed by the elastic force of the plurality of leg portions 72 in the radial direction outward, and therefore, have sliding resistance with respect to the inner peripheral surface 13b of the valve seat portion 13.

[0070] First, use Figure 4(a) The pressure regulating valve 100a in the closed valve state is described. When the pressure of the primary port 1A rises, the valve opening force generated by the pressure difference with respect to the valve core 20 acts. However, the valve core 20 does not leave the valve seat 13a until the valve opening force exceeds the combined force of the force of the pressure sensing bellows 51 and the valve spring 41 and the sliding resistance of the curved portion 73 of the sliding contact member 70.

[0071] Next, use Figure 4 (b) The pressure regulating valve 100a in the open state is described. When the pressure at the primary port 1A further rises, and the valve opening force acting on the valve core 20 exceeds the combined force of the pressure sensing bellows 51 and the valve spring 41 and the sliding resistance of the curved portion 73 of the sliding contact member 70, the valve core 20 leaves the valve seat 13a, and the fluid flows from the primary port 1A to the secondary port 1B.

[0072] Furthermore, when the pressure at the primary port 1A decreases, the valve opening force acting on the valve core 20 is lower than the combined force of the pressure sensing bellows 51 and the valve spring 41 and the sliding resistance of the curved portion 73 of the sliding contact member 70, and the valve core 20 is seated on the valve seat 13a again.

[0073] <About the drain path>

[0074] As mentioned above, in the existing pressure regulating valve, Fig.15 As shown, the primary-side pipe and the secondary-side pipe are connected by pipes via a flange having a relatively large diameter, and therefore, there is the conventional problem 1 (it cannot be applied to a pipe block).

[0075] In addition, in the existing pressure regulating valve, a relief hole 1520a is formed in the valve core 1520 (or the valve body 1510). In the closed valve state, the relief flow through the relief flow path Bc15 collides with the valve core 1520 itself and the pressure-sensing bellows 1551 that controls the valve core opening in a turbulent state. Therefore, there is the existing problem point 2 (the adverse effect of the relief flow on the valve core and the pressure-sensing bellows).

[0076] In contrast, through the inventor's intensive research, in the pressure regulating valve 100a of the first embodiment, a single-tube type is adopted in which all the structures (valve element 20 or pressure-sensing bellows 51, etc.) 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 always connects the primary port 1A and the secondary port 1B even in the closed valve state is formed in the gap between the outer peripheral 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 existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the bleed flow on the valve element and the pressure-sensing bellows), and as a result, the versatility is extremely high, the bleed flow path Bc1 can be introduced at a low cost, and the generation of vibration and noise can be suppressed, and the responsiveness when the valve is opened can be significantly improved.

[0077] Below, use Figure 4 (a) The drain flow path Bc1 in the first embodiment will be specifically described from one end side to the other end side.

[0078] At one end, there is a managed gap between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 (valve seat portion 13) and the first receiving groove G1. In addition, an elastic member Em (support unit) having at least one slit s is sandwiched between the outer peripheral groove 13g provided on the first engagement surface Es1 and the first receiving groove G1. The managed gap and the slit s constitute a discharge flow path Bc1 that is fluidically connected to the inlet Bc1i of the discharge flow. In addition, when viewed from the axis L direction, the inlet Bc1i of the discharge flow is arranged on the radially outer side of the primary port 1A.

[0079] Next, a large gap is formed between the non-engaging surface (outer peripheral surface) continuously connecting the first engaging surface Es1 and the second engaging surface Es2 of the valve body 10 and the first accommodating groove G1. The large gap constitutes a discharge flow path Bc1 fluidically connected to the inlet Bc1i of the discharge flow.

[0080] On the other end side, a managed gap is formed between the second engagement surface Es2 (outer peripheral surface) of the valve body 10 (body 11) and the second accommodating groove G2, and the managed gap constitutes a discharge flow path Bc1 that is fluidically connected to the discharge flow outlet Bc1o. In addition, the discharge flow outlet Bc1o is arranged in a region where the outer peripheral edge portion of one end side of the spoke portion 12s at the bottom plate portion 12 is not fixed to the outer peripheral edge portion of the other end side of the body 11, that is, the fan-shaped gap 12a.

[0081] According to the above, in the pressure regulating valve 100a of the first embodiment, a single-tube form is adopted in which all structures (valve core 20, pressure-sensing bellows 51, etc.) are accommodated in the valve body 10, and the pressure regulating valve 100a is inserted in the fluid path, and a discharge flow path Bc1 is formed in the gap between the outer peripheral surface of the valve body 10 and the fluid path, which always connects the primary port 1A and the secondary port 1B even in the closed valve state. In addition, in the pressure regulating valve 100a of the first embodiment, the inlet Bc1i of the discharge flow is arranged on the radial outside of the primary port 1A when viewed from the axis L direction. Therefore, in the pressure regulating valve 100a of the first embodiment, it is possible to Figure 4 The discharge flow path Bc1 in the closed valve state shown in (a) (see the dotted arrow in the figure) is Figure 4 The main flow path in the open valve state shown in (b) (refer to the solid arrow in the figure) is completely separated, thereby completely preventing the discharge flow in the closed valve state from causing adverse effects on the valve core 20 itself and the pressure-sensing bellows 51 that controls the valve core opening.

[0082] Therefore, the pressure regulating valve 100a of the first embodiment can simultaneously solve the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve element and the pressure sensing bellows), and as a result, the versatility is extremely high, the discharge flow path Bc1 can be introduced at a low cost, and the generation of vibration and noise can be suppressed, and the responsiveness when the valve is opened can be significantly improved. In addition, in the pressure regulating valve 100a of the first embodiment, by appropriately managing the gap between the first engagement surface Es1 (outer peripheral surface) and the first receiving groove G1 and between the second engagement surface Es2 (outer peripheral surface) and the second receiving groove G2, the flow path area that becomes the bottleneck of the discharge flow path Bc1 is adjusted, and the discharge flow rate can be set to a desired value.

[0083] In addition, in the first embodiment, as a structure for supporting the pressure regulating valve 100a in the fluid path and dividing the discharge flow path Bc1, a structure is shown in which an elastic member Em (for example, a cut O-ring, a C-shaped ring having elastic force in the radial direction, etc.) having at least one slit s is used on the first engagement surface Es1 (outer peripheral surface) of the valve body 10, but the present invention is not limited thereto. For example, the gap between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 and the fluid path may be managed in such a way that the gap is small, the pressure regulating valve 100a may be supported in the fluid path by lightly pressing, and the surface roughness of the first engagement surface Es1 (outer peripheral surface) of the valve body 10 may be managed to form a discharge flow path between the first engagement surface Es1 (outer peripheral surface) of the valve body 10 and the fluid path.

[0084] (Drain Flow Path Modification 1 of the First Embodiment)

[0085] use Figure 5 and Figure 6 , the pressure regulating valve 100b of the first embodiment of the modified example 1 of the discharge flow path is described. In addition, the difference between the pressure regulating valve 100b of the first embodiment of the modified example 1 of the discharge flow path and the pressure regulating valve 100a of the first embodiment is that the outer peripheral surface of the valve body 10B has at least one outer peripheral surface cutout portion 11Br (recessed portion) extending in the direction of the axis L, and the other structures are the same as the first embodiment. Here, the same symbols are marked for the same structures, and repeated descriptions are omitted. In addition, Figure 5 The elastic member Em having the slit s provided in the outer peripheral groove 13g is omitted.

[0086] <Regarding the concerns (blockage of drainage flow in the loop area of ​​the trail)>

[0087] Here, use Figure 3 , a concern of the pressure regulating valve according to the first embodiment, namely, an annular region having a smaller inner diameter than a desired one formed in the fluid path will be described.

[0088] First, the fluid path formed by the first receiving groove G1 and the second receiving groove G2 is a path formed by boring processing or the like using a cutting tool while cutting in the circumferential direction while gradually moving in the direction of the axis L. At this time, there is a concern that an annular region with a smaller diameter than desired may be formed, particularly along the circumferential direction of the fluid path, due to processing errors caused by interference of chips with the cutting tool or the like.

[0089] Here, the second engagement surface Es2 has a longer length in the direction of the axis L than the first engagement surface Es1, and therefore, the possibility of forming an annular region with a smaller diameter than the desired one in the second accommodation groove G2 opposite to the second engagement surface Es2 becomes higher than that in the first accommodation groove G1 opposite to the first engagement surface Es1. Therefore, assuming that an annular region with a smaller diameter than the desired one is formed on the second engagement surface Es2, the gap between the second engagement surface Es2 and the second accommodation groove G2 disappears in the annular region, and there is a concern that the discharge flow is blocked (hereinafter referred to as "concern (blocking of the discharge flow by the annular region with a small diameter)").

[0090] In contrast, Figure 5 As shown in (a) and (b), the pressure regulating valve 100b of the first embodiment of the modified example 1 of the discharge flow path has at least one (for example, three) outer peripheral surface cutouts 11Br extending in the direction of the axis L on the outer peripheral surface of the valve body 10B. Specifically, Figure 6 As shown, the outer peripheral surface cutout portion 11Br of the discharge flow path modification example 1 of the first embodiment extends continuously from the other end side in the direction of the axis L beyond the area opposite to the second engaging surface Es2 to the non-engaging surface (outer peripheral surface) that continuously connects the first engaging surface Es1 and the second engaging surface Es2 of the valve body 10B.

[0091] <About the drain path>

[0092] Below, use Figure 6 The drain flow path Bc2 of the drain flow path modification example 1 of the first embodiment will be specifically described from one end side to the other end side.

[0093] On one end side, a managed gap is formed between the first engagement surface Es1 of the valve body 10B (valve seat portion 13) and the first accommodation groove G1, as in the first embodiment, and at least one slit s of the elastic member Em is arranged. The managed gap and the slit s constitute a discharge flow path Bc2 that is fluidically connected to the discharge flow inlet Bc2i. In addition, the discharge flow inlet Bc2i is arranged radially outside the primary port 1A when viewed from the axis L direction.

[0094] Next, a large gap is formed between the non-engaging surface (peripheral surface) of the valve body 10B that continuously connects the first engaging surface Es1 and the second engaging surface Es2 and the first receiving groove G1. In addition, at least one peripheral surface cutout 11Br extending in the direction of the axis L is provided on the other end side of the non-engaging surface of the valve body 10B (body 11B). Therefore, the large gap and the peripheral surface cutout 11Br constitute a discharge flow path Bc2 that is fluidically connected to the inlet Bc2i of the discharge flow.

[0095] On the other end side, at least one outer peripheral surface cutout portion 11Br (recessed portion) extending in the direction of the axis L is provided on the second engagement surface Es2 (outer peripheral surface) of the valve body 10B (body 11B). Therefore, the outer peripheral surface cutout portion 11Br provided between the second engagement surface Es2 of the valve body 10B and the second receiving groove G2 constitutes a discharge flow path Bc2 which is reliably fluidically connected to the outflow port Bc2o of the discharge flow, thereby eliminating the concern (blockage of the discharge flow by the small-diameter annular region).

[0096] As described above, in the pressure regulating valve 100b of the first embodiment of the modified example of the discharge flow path, the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve core and the pressure sensing bellows) can be simultaneously eliminated, as in the first embodiment. In addition, in the pressure regulating valve 100b of the first embodiment of the modified example of the discharge flow path, the outer peripheral surface cutout 11Br provided between the second engagement surface Es2 of the valve body 10B and the second receiving groove G2 constitutes the discharge flow path Bc2 which is reliably fluidly connected to the outlet Bc2o of the discharge flow, and thus the concern (blockage of the discharge flow by the small diameter annular area) can be eliminated. Furthermore, in the pressure regulating valve 100b of the first embodiment of the variation 1 of the discharge flow path, appropriate clearance management is performed between the first engaging surface Es1 (outer peripheral surface) and the first containing groove G1 and between the second engaging surface Es2 (outer peripheral surface) and the second containing groove G2, respectively, and the flow path area that becomes the bottleneck of the discharge flow path Bc2 is adjusted, thereby enabling the discharge flow rate to be set to a desired value.

[0097] In addition, in the first embodiment, the concave portion is provided in the entire region of the second engagement surface Es2 in the direction of the axis L, but the present invention is not limited thereto. For example, the concave portion 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 in the first engagement surface Es1 and the second engagement surface Es2, or may be provided only in the first engagement surface Es1.

[0098] (Drain Flow Path Modification 2 of the First Embodiment)

[0099] use Figure 7 and Figure 8 , the pressure regulating valve 100c of the second variation of the discharge flow path of the first embodiment is described. In addition, the pressure regulating valve 100c of the second variation of the discharge flow path of the first embodiment is different from the pressure regulating valve 100a of the first embodiment in that a sealing member Sm and a connecting portion 13Ce are provided on the flange portion 13Cf of the valve seat portion 13C (valve body 10C), and the other structures are the same as those of the first embodiment. Here, the same symbols are marked for the same structures, and repeated descriptions are omitted. In addition, Figure 7 In the figure, the sealing member Sm provided in the outer peripheral groove 13g is omitted.

[0100] <Regarding issues (variation in actual discharge flow rate)>

[0101] Here, use Figure 4 (a) A description will be given of a concern that the actual discharge flow rate of the pressure regulating valve 100 a according to the first embodiment deviates from the desired discharge flow rate.

[0102] In the pressure regulating valve 100 a of the first embodiment, the bleed flow rate is set to a desired value by adjusting the flow path area that becomes a bottleneck of the bleed flow path Bc1 .

[0103] Here, the discharge flow path Bc1 is formed between the outer peripheral surface of the valve body 10 and the fluid path formed by the first receiving groove G1 and the second receiving groove G2. Therefore, even if the outer diameter of the valve body 10 is adjusted so as to obtain the desired discharge flow rate, the flow path area that becomes the bottleneck of the discharge flow path Bc1 is adjusted. In the case where the processing error of the first receiving groove G1 and the second receiving groove G2 is large, there is a concern that the actual discharge flow rate may deviate greatly from the desired discharge flow rate (hereinafter referred to as "concern (deviation of the actual discharge flow rate)").

[0104] In contrast, Figure 8 As shown, the pressure regulating valve 100c of the second modification of the discharge flow path of the first embodiment accommodates a sealing member Sm (supporting means) (for example, an O-ring, etc.) having an outer diameter larger than that of the flange portion 13Cf in the outer peripheral groove 13g of the flange portion 13Cf of the valve seat portion 13C. In addition, when viewed from the axis L direction, the flange portion 13Cf of the valve seat portion 13C is provided with a communication portion 13Ce penetrating in the axis L direction on the radial inner side of the sealing member Sm.

[0105] <About the drain path>

[0106] Below, use Figure 8 The drain flow path Bc3 of the drain flow path modification example 2 of the first embodiment will be specifically described from one end side to the other end side.

[0107] On one end side, the sealing member Sm is sandwiched between the first engagement surface Es1 of the valve seat portion 13C and the first receiving groove G1, and the first engagement surface Es1 and the first receiving groove G1 are sealed, and sliding resistance relative to the fluid path is given to the valve body 10C, and as a result, the pressure regulating valve 100c can be supported in the fluid path. Therefore, the communication portion 13Ce provided in the flange portion 13Cf constitutes a discharge flow path Bc3 that is fluidly connected to the inlet Bc3i of the discharge flow. In addition, the inlet Bc3i of the discharge flow is arranged on the radially outer side of the primary port 1A when viewed from the axis L direction.

[0108] Thus, the discharge flow path Bc3 must pass through the connecting portion 13Ce. Therefore, by setting the portion that will become the bottleneck of the discharge flow path Bc3 as the connecting portion 13Ce and adjusting the flow path area of ​​the connecting portion 13Ce, the discharge flow rate can be set to a desired value regardless of the processing error of the first receiving groove G1, so that the concern (deviation of the actual discharge flow rate) can be reliably eliminated.

[0109] Next, a large gap is formed between the non-engaging surface (outer peripheral surface) of the valve body 10C that continuously connects the first engaging surface Es1 and the second engaging surface Es2 and the first accommodating groove G1. This large gap constitutes a discharge flow path Bc3 that is fluidically connected to the inlet port Bc3i of the discharge flow.

[0110] On the other end side, a managed gap is formed between the second engagement surface Es2 (outer peripheral surface) of the valve body 10C (body 11) and the second accommodating groove G2, and the managed gap constitutes a discharge flow path Bc3 fluidically connected to the outflow port Bc3o of the discharge flow.

[0111] As described above, in the pressure regulating valve 100c of the second modification of the discharge flow path of the first embodiment, the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve core and the pressure sensing bellows) can be simultaneously eliminated, as in the first embodiment. In addition, in the pressure regulating valve 100c of the second modification of the discharge flow path of the first embodiment, the portion that becomes the bottleneck of the discharge flow path Bc3 is set as the communication portion 13Ce, and the flow path area of ​​the communication portion 13Ce is adjusted, thereby, regardless of the processing error of the first accommodating groove G1, the discharge flow rate can be set to a desired value, and therefore, the concern (deviation of the actual discharge flow rate) can be reliably resolved.

[0112] In addition, in the pressure regulating valve 100c of the second modification example of the discharge flow path of the first embodiment, the structure in which the part that will become the bottleneck of the discharge flow path Bc3 is set as the connecting portion 13Ce is described, but it is not limited to this. For example, the part that will become the bottleneck of the discharge flow path Bc3 may be set at a part other than the connecting portion 13Ce, and the connecting portion 13Ce only forms a part of the discharge flow path Bc3.

[0113] (Second Embodiment)

[0114] use Fig. 9 and Fig.10 , the pressure regulating valve 100d of the second embodiment is described. In addition, the pressure regulating valve 100d of the second embodiment is different from the pressure regulating valve 100a of the first embodiment in that a threaded joint portion having a threaded joint gap is used instead of an elastic member having a slit as a support unit for supporting the valve body 10D relative to the fluid path, and the other structures are substantially the same as the pressure regulating valve 100a of the first embodiment. Here, the same symbols are marked on the same structures, and repeated descriptions are omitted.

[0115] Here, if Figure 3As shown in FIG. 1 , in the pressure regulating valve 100a of the first embodiment, an elastic member Em having a slit s is used as a supporting unit for supporting the valve body 10 with respect to the fluid path. Therefore, in the pressure regulating valve 100a of the first embodiment, it is necessary to carry out inventory management of various types of elastic members Em, and the length of the pressure regulating valve 100a in the direction of the axis L becomes large. Therefore, it is desired to reduce the burden of inventory management in the pressure regulating valve and suppress the length in the direction of the axis L.

[0116] In contrast, although details will be described later, the pressure regulating valve 100d of the second embodiment can reduce the burden of inventory management and suppress the length in the axis L direction by using a threaded portion having a threaded clearance as a support unit for supporting the valve body 10D relative to the fluid path.

[0117] <About installation of pressure regulating valve>

[0118] First, use Fig.10 , the shapes of the valve body 10D and the piping block Bf4 are described. Fig.10 In FIG. 1 , the engaging surfaces of the valve body 10D that engage with the first receiving groove G1 and the second receiving groove G2 are labeled with a first engaging surface Es1, a second engaging surface Es2, and a second 'engaging surface Es2' corresponding to the numbers of the respective receiving grooves.

[0119] 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 diameters gradually decrease from one end side toward the other end side along the axis L. In addition, an external threaded screw-engaged portion 11Dsm (support unit, screw-engaged portion) that is screw-engaged with the pipe block Bf4 is formed on the outer peripheral surface of the other end side of the large diameter portion 11DL.

[0120] Next, the piping block Bf4 has an insertion hole along the axis L direction, and the primary side flow path Fp1 and the secondary side flow path Fp2 are formed at one end side and the other end side of the insertion hole. In the insertion hole along the axis L direction, the first receiving groove G1, the second receiving groove G2, and the third receiving groove G3 are sequentially formed from one end side to the other end side, and the diameters are successively reduced in a step-like manner. In addition, a female threaded screw joint portion Bscf is formed on the inner peripheral surface of one end side of the second receiving groove G2, and an annular step portion As serving as a positioning unit in the axis L direction of the pressure regulating valve 100d is formed between the second receiving groove G2 and the third receiving groove G3. Here, the inner diameter of the first receiving 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 receiving groove G2 is slightly larger than the outer diameter of the small diameter portion 11DS of the bottom plate portion 12 and the main body 11D, so that the pressure regulating valve 100d can be inserted into the fluid path. Furthermore, a predetermined thread engagement gap is provided between the external thread engagement portion 11Dsm of the main body 11D and the internal thread engagement portion Bscf of the second receiving groove G2 to enable thread engagement.

[0121] <About installation operation>

[0122] The installation operation of the pressure regulating valve 100d to the piping block Bf4 is described. The pressure regulating valve 100d is inserted from one end side of the primary side flow path Fp1 of the piping block Bf4 along the axis L direction. Then, while the external threaded screw connection portion 11Dsm of the main body 11D is screwed into the internal threaded screw connection portion Bscf of the piping block Bf4, the outer peripheral edge 12sc (contact portion) of the other end side of the spoke portion of the bottom plate portion 12 (see Fig. 9 The "×" mark on the main body 11D) moves toward the other end side in the direction of the axis L until it abuts against the annular step As of the piping block Bf4. The pressure regulating valve 100d can be supported in the fluid path by the threaded engagement of the external threaded threaded engagement portion 11Dsm of the main body 11D and the internal threaded threaded engagement portion Bscf of the piping block Bf4. Here, the details will be described later, but the fan-shaped gap 12a (non-abutting portion) extends in the radial direction and does not abut against the annular step As, forming an outlet Bc4o for the discharge flow. In the installed state of the pressure regulating valve 100d, the primary side port 1A divided by the valve seat portion 13D is connected to the primary side flow path Fp1 for introducing the primary side pressure P1, and the secondary side port 1B divided between the main body 11D and the fan-shaped gap 12a is connected to the secondary side flow path Fp2 for introducing the secondary side pressure P2.

[0123] <About the drain path>

[0124] Below, use Fig.10The discharge flow path Bc4 in the second embodiment will be specifically described from one end side to the other end side.

[0125] On one end side, between the first engagement surface Es1 corresponding to one end side of the large diameter portion 11DL and the first receiving groove G1, a managed gap is formed in the same manner as in the first embodiment, and the managed gap constitutes a discharge flow path Bc4 in fluid communication with the discharge flow inlet Bc4i. In addition, the discharge flow inlet Bc4i is arranged radially outside the primary port 1A when viewed from the axis L direction.

[0126] Next, between the second engaging 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 external threaded threaded portion 11Dsm of the main body 11D and the internal threaded threaded portion Bscf of the second accommodating groove G2, a predetermined threaded connection gap is formed to enable threaded connection, and the threaded connection gap constitutes a discharge flow path Bc4.

[0127] On the other end side, a managed gap is formed between the second 'engaging surface Es2' (outer peripheral surface) corresponding to the other end side of the small diameter portion 11DS and the second accommodating groove G2, and the managed gap constitutes a discharge flow path Bc4 that is fluidly connected to the discharge flow outlet Bc4o. In addition, the discharge flow outlet Bc4o does not abut against the annular step portion As, but is arranged in a fan-shaped gap 12a (non-abutting portion) extending in the radial direction.

[0128] According to the above, in the pressure regulating valve 100d of the second embodiment, similarly to the first embodiment, the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve element and the pressure sensing bellows) can be simultaneously solved. In addition, in the pressure regulating valve 100d of the second embodiment, a threaded joint part having a threaded joint gap is used instead of an elastic member having a slit as a support unit for supporting the valve body 10D relative to the fluid path, thereby reducing the burden of inventory management and suppressing the length in the direction of the axis L compared with the first embodiment. Furthermore, in the pressure regulating valve 100d of the second embodiment, the threaded joint gaps between the first engagement surface Es1 (outer peripheral surface) and the first receiving groove G1, between the second 'engaging surface Es2' (outer peripheral surface) and the second receiving groove G2, and between the male threaded joint part 11Dsm and the female threaded joint part Bscf are appropriately managed, and the flow path area that becomes the bottleneck of the discharge flow path Bc4 is adjusted, thereby setting the discharge flow rate to a desired value.

[0129] (Drainage Flow Path Modification 1 and Drainage Flow Path Modification 2 of Second Embodiment)

[0130] use Fig.11and Fig.12 , the pressure regulating valves 100e and 100f of the discharge flow path modification examples 1 and 2 of the first embodiment are described. In addition, the pressure regulating valves 100e and 100f of the discharge flow path modification examples 1 and 2 of the second embodiment are different from the pressure regulating valve 100d of the second embodiment in that the thread cutout portion 11Er and the thread D cut portion 11Fr (recessed portion) extending in the direction of the axis L are provided in a manner of transversely cutting the external threaded threaded portions 11Esm and 11Fsm (supporting unit, threaded threaded portion) of the main body 11E and 11F, and the other structures are the same as those of the second embodiment. Here, the same symbols are given to the same structures, and repeated descriptions are omitted.

[0131] <Concerns (play caused by thread clearance)>

[0132] Here, use Fig.10 Next, a description will be given of the play caused by the threaded clearance, which is a concern of the pressure regulating valve 100d according to the second embodiment.

[0133] In the pressure regulating valve 100d of the second embodiment, the thread connection gaps between the first engaging surface Es1 (outer peripheral surface) and the first accommodating groove G1, between the second 'engaging surface Es2' (outer peripheral surface) and the second accommodating groove G2, and between the external thread thread connection part 11Dsm and the internal thread thread connection part Bscf are appropriately managed, and the flow path area that becomes the bottleneck of the discharge flow path Bc4 is adjusted, thereby enabling the discharge flow rate to be set to a desired value.

[0134] Here, for example, when the bottleneck of the discharge flow path Bc4 is set between the second 'engaging surface Es2' (outer peripheral surface) and the second receiving groove G2, the flow path area of ​​the gap between the first engaging surface Es1 (outer peripheral surface) and the first receiving groove G1 and the flow path area of ​​the threaded connection gap between the male threaded threaded connection part 11Dsm and the female threaded threaded connection part Bscf need to be larger than the flow path area of ​​the gap between the second 'engaging surface Es2' (outer peripheral surface) and the second receiving groove G2. Here, there is no restriction on the gap between the first engaging surface Es1 (outer peripheral surface) and the first receiving groove G1, so the flow path area can be easily increased. On the other hand, if the threaded connection gap between the male threaded threaded connection part 11Dsm and the female threaded threaded connection part Bscf is set larger than the allowable range, the threaded connection part will vibrate due to the pressure difference between the primary side pressure P1 and the secondary side pressure P2, and there is a concern that the reliability of the pressure regulating valve will be reduced (hereinafter referred to as "concern (vibration caused by threaded connection gap)").

[0135] In contrast, Fig.11 and Fig.12As shown, the pressure regulating valves 100e and 100f of the relief flow path modification examples 1 and 2 of the second embodiment are provided with thread cutout portions 11Er and thread D cut portions 11Fr (recessed portions) extending in the axis L direction at the male threaded threaded portions 11Esm and 11Fsm.

[0136] In the second embodiment of the leakage flow path modification example 1 and the leakage flow path modification example 2, the thread cutout portion 11Er and the thread D cut portion 11Fr extending in the direction of the axis L are formed in the external thread threaded joint portion 11Esm and 11Fsm, respectively, so that the flow path area of ​​the threaded joint gap can be relatively easily increased, and the worrying items (shaking caused by the threaded joint gap) can be reliably eliminated. Therefore, by appropriately managing the gap between the first engaging surface Es1 (outer peripheral surface) and the first receiving groove G1 and between the second 'engaging surface Es2' (outer peripheral surface) and the second receiving groove G2, respectively, the flow path area that becomes the bottleneck of the leakage flow path is adjusted, and the leakage flow rate can be set to a desired value (illustration omitted, refer to Fig.10 (Second embodiment)).

[0137] According to the above, in the pressure regulating valves 100e and 100f of the bleed flow path modification examples 1 and 2 of the second embodiment, the conventional problem 1 (cannot be applied to the piping block) and the conventional problem 2 (adverse effects of the bleed flow on the valve element and the pressure sensing bellows) can be solved at the same time as in the second embodiment. In addition, in the pressure regulating valves 100e and 100f of the bleed flow path modification examples 1 and 2 of the second embodiment, the threaded joint part having a threaded joint clearance is used as the support means for supporting the valve body 10E and 10F with respect to the fluid path, as in the second embodiment, the burden of inventory management can be reduced and the length in the direction of the axis L can be suppressed. Furthermore, in the pressure regulating valves 100e and 100f of the bleed flow path modification examples 1 and 2 of the second embodiment, by forming the thread cutout portion 11Er and the thread D cutout portion 11Fr extending in the direction of the axis L in the male threaded threaded joint portions 11Esm and 11Fsm, respectively, the flow path area of ​​the threaded joint gap can be relatively easily increased, and the worrying issue (shaking caused by the threaded joint gap) can be reliably resolved. Moreover, in the pressure regulating valves 100e and 100f of the bleed flow path modification examples 1 and 2 of the second embodiment, the gaps between the first engagement surface Es1 (outer peripheral surface) and the first receiving groove G1 and between the second 'engaging surface Es2' (outer peripheral surface) and the second receiving groove G2 are appropriately managed, and the flow path area that becomes the bottleneck of the bleed flow path is adjusted, thereby setting the bleed flow rate to a desired value.

[0138] (Modification of Mounting Direction of Second Embodiment)

[0139] use Fig.13 and Fig.14 , a pressure regulating valve 100g of a modified example of the installation direction of the second embodiment is described. In addition, the pressure regulating valve 100g of the modified example of the installation direction of the second embodiment is different from the pressure regulating valve 100d of the second embodiment in that it has an installation direction toward one end side with respect to the piping block Bf5, and the other structures are the same as those of the second embodiment. Here, the same symbols are attached to the same structures, and repeated descriptions are omitted.

[0140] <About installation of pressure regulating valve>

[0141] First, use Fig.13 and Fig.14 The shapes of the valve body 10G and the piping block Bf5 are described below. Fig.14 In FIG. 1 , the engaging surface of the valve body 10G that engages with the second accommodating groove G2 is denoted by a second engaging surface Es2 corresponding to the number of each accommodating groove.

[0142] The valve body 10G (body 11G) is formed along the axis L direction, from the other end side to the one end side, in sequence, with a large diameter portion 11GL (outer peripheral surface) with an increasing outer diameter, an externally threaded threaded portion 11Gsm (support unit, threaded portion) threadedly connected to the piping assembly Bf5, and a small diameter portion 11GS (outer peripheral surface) with an outer diameter smaller than that of the large diameter portion 11GL.

[0143] 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 at one end side and the other end side of the insertion hole. In the insertion hole along the axis L direction, a first receiving groove G1, a second receiving groove G2, and a third receiving groove G3 whose diameters are successively reduced in a step-like manner are formed in sequence from the other end side to the one end side. In addition, a female threaded screw joint portion Bscf is formed on the inner peripheral surface of the other end side of the second receiving groove G2, and an annular step portion As serving as a positioning unit in the axis L direction of the pressure regulating valve 100g is formed between the second receiving groove G2 and the third receiving groove G3. Here, the inner diameter of the first receiving groove G1 is slightly larger than the outer diameter of the male threaded screw joint portion 11Gsm, and the inner diameter of the second receiving 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 thread engagement gap is provided between the external thread engagement portion 11Gsm of the main body 11G and the internal thread engagement portion Bscf of the second receiving groove G2 for thread engagement.

[0144] <About installation operation>

[0145] The installation operation of the pressure regulating valve 100g to the piping block Bf5 is described. The pressure regulating valve 100g is inserted from the other end side of the secondary flow path Fp2 along the axis L direction of the piping block Bf5. Then, while the external threaded screw connection portion 11Gsm of the body 11G is screwed into the internal threaded screw connection portion Bscf of the piping block Bf5, the outer peripheral edge 13Gc (contact portion) of the valve seat portion 13G (see FIG. 1 ) is screwed into the valve seat portion 13G. Fig.13 The "×" mark on the main body 11G moves toward one end side in the direction of the axis L until it abuts against the annular step As of the piping block Bf5. The pressure regulating valve 100g can be supported in the fluid path by the threaded engagement of the external threaded engagement portion 11Gsm of the main body 11G and the internal threaded engagement portion Bscf of the piping block Bf5. Here, the details will be described later, but the radial cutout portion 13Gr (non-abutting portion) extends in the radial direction and is used as a rotating tool insertion portion 13d before shipment, and does not abut against the annular step As, forming an inlet Bc5i for the discharge flow. In the installed state of the pressure regulating valve 100g, the primary side port 1A divided by the valve seat portion 13G is connected to the primary side flow path Fp1 for introducing the primary side pressure P1, and the secondary side port 1B divided between the main body 11G and the fan-shaped gap 12a is connected to the secondary side flow path Fp2 for introducing the secondary side pressure P2. As described above, the pressure regulating valve 100g improves the degree of freedom of the mounting direction with respect to the piping block Bf5, and therefore, the conventional problem 1 (inability to be applied to the piping block) can be solved more reliably.

[0146] <About the drain path>

[0147] Below, use Fig.14 The discharge flow path Bc5 of the mounting direction modification example of the second embodiment will be specifically described from one end side to the other end side.

[0148] On one end side, a large gap is formed between the small diameter portion 11GS and the second receiving groove G2, and the large gap constitutes a discharge flow path Bc5 that is fluidically connected to the discharge flow inlet Bc5i. In addition, the discharge flow inlet Bc5i does not abut against the annular step portion As, but is arranged in a radial cutout portion 13Gr (non-abutting portion) extending in the radial direction. In addition, the discharge flow inlet Bc5i is arranged on the radially outer side of the primary port 1A when viewed from the axis L direction.

[0149] Next, a predetermined threaded connection gap is formed between the second engaging surface Es2 of the main body 11G and the second accommodating groove G2, that is, between the external threaded connection part 11Gsm of the main body 11G and the internal threaded connection part Bscf of the second accommodating groove G2, in order to enable threaded connection, and the threaded connection gap constitutes the discharge flow path Bc5.

[0150] On the other end side, a large gap is formed between the large diameter portion 11GL and the second accommodating groove G2 and the first accommodating groove G1 , and the large gap constitutes a discharge flow path Bc5 in fluid communication with an outflow port Bc5o of the discharge flow.

[0151] According to the above, in the pressure regulating valve 100g of the installation direction modification example of the second embodiment, similarly to the second embodiment, the existing problem 1 (cannot be applied to the piping block) and the existing problem 2 (adverse effects of the discharge flow on the valve core and the pressure sensing bellows) can be solved at the same time. In addition, in the pressure regulating valve 100g of the installation direction modification example of the second embodiment, similarly to the second embodiment, a threaded joint portion having a threaded joint clearance is used as a support unit for supporting the valve body 10G relative to the fluid path, thereby reducing the burden of inventory management and suppressing the length in the direction of the axis L compared to the first embodiment. Moreover, the pressure regulating valve 100g of the installation direction modification example of the second embodiment increases the degree of freedom of the installation direction relative to the piping block Bf5, so that the existing problem 1 (cannot be applied to the piping block) can be solved more reliably. In addition, in the pressure regulating valve 100g of the installation direction modification example of the second embodiment, the thread connection gaps between the small diameter portion 11GS (outer peripheral surface) and the second accommodating groove G2, between the second engaging surface Es2 (outer peripheral surface) and the second accommodating groove G2, and between the external thread thread connection portion 11Gsm and the internal thread thread connection portion Bscf are appropriately managed, and the flow path area that becomes the bottleneck of the discharge flow path Bc5 is adjusted, thereby enabling the discharge flow rate to be set to a desired value.

[0152] <Other>

[0153] In addition, in the present embodiment (the first embodiment, the first embodiment, the first embodiment, the first embodiment, the second embodiment, the second embodiment, the second embodiment, the second embodiment, the second embodiment, and the second embodiment, the second embodiment), the shapes of the valve body and the piping block are described by taking the case where the piping block adopts a straight-flow path as an example, but the present invention is not limited thereto, and any shape may be used as long as the piping block has an insertion hole and the outer diameter of the valve body has a certain gap that can be inserted into the insertion hole. For example, in the case where the piping block adopts an L-shaped fluid path, the other end side of the body may be closed by using a bottom plate having a disc shape, and a horizontal hole that divides the secondary port 1B may be provided on the side of the body, so that the fluid flows in the pressure regulating valve from the primary port 1A to the secondary port 1B in an L-shaped manner. At this time, similar to the direct current path, the discharge flow path is formed in the gap between the outer peripheral surface of the valve body and the fluid path. Therefore, the existing problem 1 (cannot be applied to the piping assembly) and the existing problem 2 (the adverse effect of the discharge flow on the valve core and the pressure-sensing bellows) can be eliminated at the same time.

[0154] In the pressure regulating valve 100b of the first embodiment of the modified example of the discharge flow path, at least one outer peripheral surface cutout portion 11Br (recessed portion) extending in the direction of the axis L is adopted on the outer peripheral surface of the discharge flow path Bc2 of the valve body 10B (body 11B), but the present invention is not limited thereto. For example, in the modified example of the discharge flow path of the first embodiment, the second embodiment, the modified example of the discharge flow path of the second embodiment, the modified example of the discharge flow path of the second embodiment, and the modified example of the mounting direction of the second embodiment, at least one outer peripheral surface cutout portion (recessed portion) extending in the direction of the axis L may be adopted on the outer peripheral surface of the discharge flow path of the valve body.

[0155] In the pressure regulating valves 100e and 100f of the bleed flow path modification examples 1 and 2 of the first embodiment, the thread cutouts 11Er and the thread D cutouts 11Fr (recesses) extending in the direction of the axis L are used in the male threaded threaded joints 11Dsm and 11Fsm, but the invention is not limited thereto. For example, in the mounting direction modification example of the second embodiment, the thread cutouts and the thread D cutouts (recesses) extending in the direction of the axis L may be used in the male threaded threaded joints 11Gsm.

[0156] It goes without saying that the pressure regulating valves 100a to 100g of this embodiment can be applied to all fluid devices and fluid circuits. In addition, the present invention is not limited to the above-mentioned forms, embodiments, and modifications described anywhere, and appropriate changes and modifications can be made within the scope of the technical concept of the present invention.

Claims

1. A pressure regulating valve inserted in a fluid path, It is characterized in that have: a valve body having a cylindrical shape and having a primary port, a secondary port, and a valve seat; A valve core moves along the axial direction to be seated or separated relative to the valve seat; and a force applying unit, which applies force to the valve core toward the valve seat, The valve core and the force applying unit are arranged in the valve body. A drain flow path that constantly communicates the primary port and the secondary port is formed by a gap between the outer peripheral surface of the valve body and the fluid path.

2. The pressure regulating valve according to claim 1, characterized in that: The inlet of the discharge flow path is arranged radially outward of the primary port when viewed from the axial direction.

3. The pressure regulating valve according to claim 1, characterized in that: The outer peripheral surface of the valve body has at least one recess extending in the axial direction. The drain flow path includes the recessed portion.

4. The pressure regulating valve according to claim 1, characterized in that: The valve body further includes a support unit on the outer peripheral surface thereof for supporting the valve body relative to the fluid path. The drain flow path is provided in the support unit.

5. The pressure regulating valve according to claim 4, characterized in that: The support unit is composed of an elastic member arranged between the valve body and the fluid path. The discharge flow path includes at least one slit and / or through hole included in the elastic member.

6. The pressure regulating valve according to claim 4, characterized in that: The support unit is composed of a threaded joint portion having a threaded joint gap between the support unit and the fluid path. The drain flow path includes the thread engagement gap.

7. The pressure regulating valve according to claim 6, characterized in that: The threaded joint has at least one recess extending along the axial direction. The drain flow path includes the recessed portion of the threaded coupling portion.

8. The pressure regulating valve according to claim 1, characterized in that: The valve body further includes a support unit on the outer peripheral surface thereof for supporting the valve body relative to the fluid path. The support unit is composed of a sealing member that seals between the flange portion of the valve body and the fluid path. The flange portion of the valve body is provided with a communication portion penetrating in the axial direction on the radial inner side of the sealing member when viewed in the axial direction. The discharge flow path includes the communication portion.

9. The pressure regulating valve according to claim 1, characterized in that: The other end or one end of the valve body has a contact portion that contacts the annular step portion of the fluid path and a non-contact portion that does not contact the annular step portion of the fluid path and extends in the radial direction. The drain flow path includes the non-contact portion.

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