Pressure adjusting valve

Abstract

The invention provides a pressure adjusting valve, which can realize miniaturization and improve versatility by studying the arrangement of a position adjusting part. A pressure adjustment valve (100a) is provided with: a main body (11) having a secondary-side port (1B); a valve seat part (12) that is separated from the main body (11), is disposed on one end side of the main body, and has a primary side port (1A) and a valve seat (12a); a valve body (20) that moves in the direction of the axis (L) and is seated or unseated with respect to the valve seat (12a); a biasing means (41, 51) that biases the valve body (20) toward the valve seat (12a); and a position adjustment section (42) capable of adjusting the biasing force of the biasing means (41, 51). The position adjustment part (42) has a structure capable of displacing the relative positions of the valve seat part (12) and the main body (11) in the axial direction. As a result, it is possible to eliminate the conventional problem point 1 (large installation space) and the conventional problem point 2 (not applicable to a piping block).

Description

Technical Field

[0001] The present invention relates to a pressure regulating valve including a position adjusting portion. Background Art

[0002] In order to variably control the opening degree according to the pressure acting on the valve body, most pressure regulating valves have a structure in which an adjustment screw member as a position adjustment portion is provided and a valve opening (or valve closing) pressure is arbitrarily set.

[0003] For example, in Patent Document 1, Fig.12 As shown, a pressure regulating valve 1200 (hereinafter referred to as "conventional pressure regulating valve") is described, which includes: a valve body 1210, which has a primary port 1201A, a secondary port 1201B and a valve seat 1212a; and a valve core 1220, which is seated or unseated relative to the valve seat 1212a. In addition, Patent Document 1 describes that it also includes: a sliding unit 1230, which supports the sliding of the valve core 1220 in the direction of the axis L by using a cylinder member 1231 and a piston member 1233; an adjustment spring unit 1240, which adjusts the force of the valve spring 1241 via an adjustment screw member 1242; a pressure-sensing bellows unit 1250, which has a pressure-sensing bellows 1251; and an elastic member 1270, which has a plurality of legs 1272 that abut against the inner peripheral surface 1212b.

[0004] Here, in the conventional pressure regulating valve, the force of the valve spring 1241 and the pressure sensing bellows 1251 is adjusted by the adjusting screw member 1242 on the secondary port 1201B side of the valve spring 1241 and the pressure sensing bellows 1251. Therefore, in the conventional pressure regulating valve, the adjusting screw member 1242 needs to be arranged in the secondary port 1201B, so that the whole is elongated in the direction of the axis L, and the installation space may become larger (hereinafter referred to as "conventional problem 1 (large installation space)").

[0005] In addition, the pressure regulating valve is preferably installed in various piping paths depending on the purpose of the user, and is particularly preferably installed in a flow path formed in a piping block for weight reduction and space saving.

[0006] However, the conventional pressure regulating valve is connected between the primary side piping and the secondary side piping via piping such as a flange with a relatively large diameter, and therefore may not be applicable to the flow path within the piping block, etc., and its versatility becomes extremely low (hereinafter referred to as "Conventional Problem 2 (Cannot be Applicable to Piping Blocks)").

[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 which can be downsized and has improved versatility by devising a configuration of a position adjusting portion.

[0012] Solutions to Solve Problems

[0013] In order to solve the above-mentioned problems, the pressure regulating valve comprises: a main body, which has a secondary side port; a valve seat portion, which is separate from the main body, is arranged on one end side of the main body, and has a primary side port and a valve seat; a valve core, which moves in the axial direction to sit on or leave the valve seat; a force-applying unit, which applies force to the valve core toward the valve seat; and a position adjustment portion, which can adjust the force of the force-applying unit, and the position adjustment portion is a structure that can displace the relative position of the valve seat portion and the main body in the axial direction.

[0014] Furthermore, in the above-mentioned pressure regulating valve, the position adjusting portion may be constituted by an adjusting screw portion, and the adjusting screw portion may be provided on the valve seat portion and the main body, respectively.

[0015] In the pressure regulating valve, the valve seat portion may include a pair of rotation tool insertion portions on one end surface, and the pair of rotation tool insertion portions may be arranged on an outer peripheral side of the primary port when viewed in the axial direction.

[0016] In addition, the above-mentioned pressure regulating valve may also be provided with: a force adjusting unit, which moves the valve seat portion in the axial direction relative to the main body via the adjustment threaded portion; and a force fixing unit, which fixes the valve seat portion to the main body by the force adjusting unit when the valve core acts on the valve seat portion.

[0017] In the pressure regulating valve, the valve seat portion may extend from the main body toward one end, and an outer peripheral groove for accommodating a sealing member may be provided on an outer peripheral surface of one end portion of the valve seat portion.

[0018] In addition, in the above-mentioned pressure regulating valve, the valve seat portion may also have a flange portion at a position closer to one end side than the adjusting thread portion, and when viewed from the axial direction, there is a welding portion provided by the force fixing unit and a gap portion where the welding portion is not provided between the outer peripheral surface of the flange portion and the inner peripheral surface of the main body, and the discharge flow path that always connects the primary side port and the secondary side port is composed of the gap portion and the threaded joint gap of the adjusting thread portion.

[0019] In the pressure regulating valve, a flange cutout may be formed at a portion of an outer peripheral edge of the flange, and the gap may be formed as a gap between an outer peripheral surface of the flange cutout and an inner peripheral surface of the body.

[0020] In addition, in the above-mentioned pressure regulating valve, a threaded cut portion extending along the axial direction may be formed on at least one of the valve seat portion and the adjustment thread portion of the main body, and the threaded connection gap is formed as a gap between the threaded cut portion and the adjustment thread portion opposite to the threaded cut portion.

[0021] Furthermore, in the above-mentioned pressure regulating valve, the main body may include a reduced diameter portion, and a lateral hole defining a secondary side port may be formed in the reduced diameter portion.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide a pressure regulating valve which can be reduced in size and has improved versatility by devising the arrangement of a position adjusting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 and 2 are explanatory diagrams showing a pressure regulating valve according to a first embodiment of the present invention, wherein (a) is a longitudinal sectional view of the pressure regulating valve, and (b) is a bottom view thereof as viewed from the direction of arrow Ib shown in (a).

[0025] Figure 2 yes Figure 1 The explanatory diagrams of the valve seat portion shown are as follows: (a) is a bottom perspective view, (b) is a side view, and (c) is a bottom view.

[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 Is Figure 3 The enlarged cross-sectional view of the area surrounded by the dotted line IVa shown in FIG. 1 shows a closed valve state (a) and a closed valve state (b) and a closed valve state (b).

[0028] Figure 5 is an explanatory diagram of a modified example of the rotation tool insertion portion of the first embodiment (with Figure 2 (c) Corresponding bottom view).

[0029] Figure 6 1 is an explanatory diagram of a modified example 1 of the discharge flow path of the first embodiment, (a) is a longitudinal sectional view after the valve seat portion is removed from the main body, and (b) is a longitudinal sectional view of the discharge flow path of the first embodiment. Figure 1 (b) Corresponding bottom view.

[0030] Figure 7 is an explanatory diagram of a second modification of the discharge flow path of the first embodiment, (a) is Figure 4 (a) is an enlarged sectional view corresponding to the figure, (b) is a bottom view of the main body and the valve seat portion as viewed from the direction of arrow VIIb shown in (a), and (c) is a bottom stereoscopic view of the valve seat portion shown in (a).

[0031] Figure 8 is an explanatory diagram of a modification example 3 of the discharge flow path of the first embodiment (with Figure 2 (a) corresponds to the bottom view).

[0032] Fig. 9 It is a longitudinal sectional view showing a pressure regulating valve according to a second embodiment.

[0033] Fig.10 yes Fig. 9 The explanatory diagrams of the valve seat portion shown are as follows: (a) is a bottom perspective view, (b) is a side view, and (c) is a bottom view.

[0034] Fig.11 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.

[0035] Fig.12 It is a cross-sectional view showing a pressure regulating valve according to the prior art.

[0036] Explanation of symbols

[0037] 100a~100f—pressure regulating valve, 1A—primary port, 1B—secondary port, 10, 10F—valve body, 11, 11F—body, 11a—horizontal hole, 11c—central part (reduced diameter part), 11d—one end, 11i—insertion hole, 11l—large diameter part, 11n—reduced neck part, 11o—opening part, 11s—small diameter part, 11scm—external threaded threaded part, 11u—other end, 12, 12B, 12C, 12D, 12E, 12F—valve seat part, 12a—valve seat, 12b—inner circumferential surface, 12c, 12Bc, 12Cc, 12Dc, 12Ec, 12Fc—flange portion, 12Dn—flange cutout portion, 12d, 12Bd—a pair of rotating tool insertion portions, 12Fg—outer circumferential groove, 20—valve core, 21—valve portion, 22—boss portion, 30—sliding unit, 31—cylinder member, 32—connecting member, 33—piston member, 40—adjusting spring unit, 41—valve spring (force applying unit), 42, 42C, 42D, 42 E—adjustment thread portion (position adjustment portion), 42a—main body side adjustment thread portion, 42b, 42Eb—valve seat side adjustment thread portion, 42En—thread cut portion, 50—pressure-sensing bellows unit, 51—pressure-sensing bellows (force-applying unit), 52—fixing metal part, 52a—boss portion, 70—elastic component, 71—circular ring fixing portion, 72—leg portion, 73—bend portion, A—storage chamber, B, Bf—piping block, Bscf—internal thread thread joint portion, Bc—drain flow path, Cr—rivet Connecting part, D1—inner diameter of the insertion hole of the main body, D2—outer diameter of the flange part of the valve seat part, Fp1—primary side flow path, Fp2—secondary side flow path, G1—first receiving groove, G2—second receiving groove, G3—third receiving groove, G4—fourth receiving groove, Ga—annular groove, Gf—annular fixing groove, Gi—annular sealing groove, GpC, GpD—gap part, L—axis line, Or—O-ring (sealing component), P1—primary side pressure, P2—secondary side pressure, W, WC, WD, WF—welding part. DETAILED DESCRIPTION

[0038] Reference Figures 1 to 11 The embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments.

[0039] <About Terminology>

[0040] In the description of this specification and claims, "left", "right", "upper" and "lower" mean Figure 1 , Figure 2 (b) Figure 3 , Figure 4 , Figure 6 a), Figure 7 (a) Fig. 9 , Fig.10 (b) Fig.11 In the direction shown. In the description of this specification and claims, "one end" and "the other end" mean the "lower end" and "upper end" in the drawings. In the description of this specification and claims, "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 protruding toward the central axis side of the pressure-sensing bellows) and the maximum outer diameter (the outer diameter of the "peak" part of the corrugation shape protruding in the direction of the central axis away from the central axis side of the pressure-sensing bellows). In the description of this specification and claims, "position adjustment part" means "a structure that can displace the relative position of the valve seat part and the main body in the axial direction."

[0041] (First Embodiment)

[0042] <About the structure of the pressure regulating valve>

[0043] use Figure 1 and Figure 2 A pressure regulating valve 100a according to a first embodiment of the present invention is described. 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 an elastic member 70. The following describes the various structures of the pressure regulating valve 100a in sequence. 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.

[0044] Here, the pressure regulating valve 100a of the first embodiment is configured such that the main body 11 and the valve seat portion 12 are separate bodies, and the adjusting threaded portion 42 as the position adjusting portion has a structure capable of displacing the relative positions of the valve seat portion 12 and the main body 11 in the direction of the axis L, thereby eliminating the previous problem 1 (large installation space) and the previous problem 2 (cannot be applied to piping blocks), and the installation action itself is also simple, as will be described in detail later.

[0045] The valve body 10 is made of metal such as stainless steel or aluminum, and includes a body 11 having a bottomed cylindrical shape and a valve seat portion 12 which is separate from the body 11 and has a substantially cylindrical shape.

[0046] The body 11 defines a storage chamber A inside and has a plurality of (e.g., four) horizontal holes 11a arranged evenly in the circumferential direction and defining the secondary port 1B in the side wall when viewed from the axis L. In addition, an opening 11o coaxial with the axis L is formed at the other end 11u of the body 11.

[0047] The valve seat portion 12 includes an annular valve seat 12 a and an inner peripheral surface 12 b that defines the primary port 1A.

[0048] 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 toward one end on the same axis as the axis L.

[0049] The valve portion 21 has an outer diameter larger than that of the valve seat 12 a and is seated on or separated from the valve seat 12 a by moving in the direction of the axis L. The boss portion 22 is fitted in the opening of the elastic member 70 .

[0050] The sliding unit 30 includes: a cylindrical cylinder member 31 fixed to the valve core 20 at one end; a connecting member 32 abutting against a fixing metal member 52 at the other end by the 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 supported to be able to move forward and backward relative to the cylinder member 31. The sliding 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 sliding unit 30 transmits the force of the valve spring 41 to the pressure-sensing bellows 51, and the pressure-sensing bellows 51 is urged in the extension direction along the axis L.

[0051] The adjustment spring unit 40 includes a valve spring 41 (biasing unit) as a compression spring and an adjustment threaded portion 42 as a position adjustment portion, which adjusts the force acting on the valve element 20 by expanding and contracting the valve spring 41 and the pressure-sensing bellows 51. The details of the adjustment threaded portion 42 as the position adjustment portion will be described later.

[0052] 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 means) 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.

[0053] One end of the pressure-sensing bellows 51 is welded and fixed to the other end surface on the outer peripheral side of the valve body 20 , and the other end is welded and fixed to one end surface on the outer peripheral side of the fixing member 52 , thereby sealing the inside.

[0054] 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 12. As a result, the upward force acting on the pressure-sensing bellows 51 and the downward force acting on the valve core 20 due to the secondary side pressure P2 cancel each other out. 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.

[0055] The fixing member 52 has a boss portion 52 a protruding toward the other end on the same axis as the axis L. After being fitted into the opening 11 o of the main body 11 , the boss portion 52 a is fixed to the main body 11 by forming a caulking portion Cr through caulking.

[0056] The elastic member 70 is made of a metal such as stainless steel or phosphor bronze, and is formed by stamping a relatively thin and elastic member. In addition, the elastic member 70 includes: a circular fixing portion 71 having an opening on the same axis as the axis L; a plurality of leg portions 72 connected to the outer circumference of the circular fixing portion 71, extending toward one end in the direction of the axis L, and arranged on the same circumference when viewed from the direction of the axis L (e.g., eight leg portions are arranged at equal intervals on the same circumference); and a curved portion 73 formed between one end and the other end of the leg portion 72 and having a convex shape relative to the inner circumferential surface 12b of the valve seat portion 12. After the boss portion 22 is fitted into the opening of the elastic member 70, the elastic member 70 is joined to the valve core 20 via a welding portion (not shown) based on spot welding or the like. In addition, the curved portion 73 has a convex shape relative to the inner circumferential surface 12b of the valve seat portion 12, so the curved portion 73 is in sliding contact with the inner circumferential surface 12b of the valve seat portion 12 in substantially point contact.

[0057] <Details of the Position Adjustment Unit>

[0058] As mentioned above, in the conventional pressure regulating valve, Fig.12 As shown, the adjustment threaded component 1242 as the position adjustment portion is used to adjust the acting force of the valve spring 1241 and the pressure-sensing bellows 1251 at the other end side of the valve spring 1241 and the pressure-sensing bellows 1251, thereby solving the previous problem 1 (large installation space).

[0059] In addition, the conventional pressure regulating valve has conventional problem 2 (cannot be applied to a piping block) because the primary-side piping and the secondary-side piping are connected via a flange having a relatively large diameter or the like.

[0060] In this regard, the inventor, through intensive research, conceived a solution to the previous problem 1 (large installation space) and the previous problem 2 (cannot be applied to piping blocks): to study the configuration of the position adjustment part, that is, to set the position adjustment part to a structure that can displace the relative position of the valve seat part 12 and the main body 11 in the direction of the axis L.

[0061] In the pressure regulating valve 100a of the first embodiment, the main body 11 and the valve seat 12 are separated, and the adjustment screw portion 42 as an example of the position adjustment portion is provided on the main body 11 and the valve seat 12, respectively. That is, in the pressure regulating valve 100a of the first embodiment, the force of the valve spring 41 and the pressure-sensing bellows 51 is adjusted by the adjustment screw portion 42, so the adjustment screw component used in the conventional pressure regulating valve is not required, that is, miniaturization can be achieved, and the conventional problem 1 (large installation space) can be eliminated. In addition, in the pressure regulating valve 100a of the first embodiment, by setting the entire structure to a single-tube type housed in the main body 11, the conventional problem 2 (cannot be applied to the piping block) can be eliminated, and the installation operation itself becomes simple. Moreover, in the pressure regulating valve 100a of the first embodiment, the valve seat 12, which requires relatively high dimensional accuracy, is separated from the main body 11, and processing becomes easy.

[0062] Specifically, the adjustment thread portion 42 is composed of a main body side adjustment thread portion 42a formed on the inner peripheral surface of one end side of the main body 11 and a valve seat side adjustment thread portion 42b formed on the outer peripheral surface of the valve seat portion 12, and they are threadedly connected to each other. As a result, the other end side of the valve spring 41 and the pressure-sensing bellows 51 only need to be simply fixed to the main body 11, so that the structure of the other end side of the main body 11 can be greatly simplified, and as a result, it can be set to a single cylinder type in which all structures are accommodated in the main body 11 having a bottomed cylindrical shape.

[0063] <Changes in Position Adjustment Section>

[0064] Here, in the pressure regulating valve 100a of the first embodiment, the adjusting screw portion 42 is used as the position adjusting portion, but the present invention is not limited to this. As defined in the aforementioned <About Terms>, the "position adjusting portion" is "a structure that can displace the relative position of the valve seat portion and the main body in the axial direction". Therefore, as the position adjusting portion, any structure can be used as long as it is a structure that can displace the relative position of the valve seat portion and the main body in the axial direction. Here, as an example of the position adjusting portion, although not shown in the figure, the case of using a sliding portion is described.

[0065] The sliding portion is composed of an outer peripheral surface of one end of a valve seat portion 12 having a cylindrical shape and an inner peripheral surface of one end of a main body 11 (hereinafter referred to as a "sliding surface"). The sliding surfaces having the cylindrical shape and facing each other set their central axes coaxially, and appropriately manage the gap between the sliding surfaces so that the sliding resistance when in contact is smaller than a predetermined value. Thus, when the sliding surfaces contact each other, the inclination relative to the axis L direction is suppressed, and one sliding surface is guided by the other sliding surface while ensuring the coaxial state, and can slide in the axis L direction. In addition, a groove portion may be provided on the sliding surface of the valve seat portion 12. Moreover, in the groove portion, it is also possible to have a straight line shape extending in the axis L direction on the other end side, and a spiral shape continuous with the straight line shape on the other end side. Thus, after the valve seat portion 12 is slid and moved relative to the main body 11 in the axis L direction to the desired adjustment position, the valve seat portion 12 is rotated relative to the main body 11 to be fitted and fixed, and as a result, the position can be adjusted.

[0066] Therefore, even if the sliding portion is adopted as the position adjusting portion, the conventional problem 1 (large installation space) and the conventional problem 2 (inapplicability to a piping block) can be solved.

[0067] <Countermeasures to Concerns>

[0068] In addition, in the conventional pressure regulating valve, in the valve opening pressure calibration process before shipment, a performance measuring device is connected to the fluid, and the secondary side pressure is measured while a fluid such as air flows through the primary side port, and the valve opening pressure is adjusted so that the predetermined pressure is reached at a predetermined flow rate by rotating the adjusting screw member using an adjusting fixture extending in the secondary side port. However, in the conventional pressure regulating valve, the secondary side pressure that serves as a reference when setting the valve opening pressure varies due to the adjusting fixture disposed in the secondary side port, and therefore there is a concern about the deviation of the valve opening pressure setting value (hereinafter referred to as "concern (deviation of the valve opening pressure setting value)").

[0069] <About the force adjustment unit>

[0070] First, the valve seat portion 12 of the first embodiment further includes: a flange portion 12c, which is provided on one end side relative to the adjustment thread portion 42; and a pair of rotation tool insertion portions 12d, which are formed on one end surface of the flange portion 12c and are arranged at symmetrical positions across the axis L. In addition, the pair of rotation tool insertion portions 12d have a pair of circular holes (so-called crab eye holes), such as Figure 1 (b) and Figure 2As shown in (a) and (c), when viewed from the axis L direction, it is arranged on the outer peripheral side of the primary port 1A. Here, the adjustment fixture (not shown) engaged with the pair of rotating tool insertion parts 12d is a pair of cylindrical screwdrivers shaped to be able to engage with each circular hole. Next, the force adjustment unit for the valve core 20 causes the adjustment fixture to engage with the pair of rotating tool insertion parts 12d from the primary flow path side, and rotates the valve seat part 12 relative to the main body 11 via the adjustment threaded part 42, and moves along the axis L direction, thereby adjusting the expansion and contraction of the valve spring 41 and the pressure-sensing bellows 51, that is, the force on the valve core 20.

[0071] Therefore, in the valve opening pressure calibration process before shipment, the pressure regulating valve 100a of the first embodiment is connected to the performance measurement device by fluid, similarly to the conventional pressure regulating valve, and the secondary side pressure is measured while a fluid such as air is allowed to flow from the primary side port, and the valve opening pressure is adjusted by the force adjusting unit through the adjusting screw portion 42 so that the predetermined pressure is reached at a predetermined flow rate. At this time, a pair of rotating tool insertion portions 12d exist in the dead flow area on the outer peripheral side of the primary side port 1A away from the mainstream of the fluid path, so the adjustment fixture is also arranged in the dead flow area. Therefore, the pressure regulating valve 100a of the first embodiment can suppress the influence of the force adjusting unit on the fluid being measured, and even if the valve opening pressure is adjusted on the primary flow path side, the primary side pressure is relatively stable, and the influence on the secondary side pressure can be suppressed, so that the concerns (deviation of the valve opening pressure setting value) can be eliminated, and the valve opening pressure setting value can be adjusted with higher accuracy.

[0072] <About the force fixing unit>

[0073] After the force acting on the valve core 20 is adjusted by the force adjusting unit so as to open the valve at the valve opening pressure setting value, the valve seat portion 12 is fixed relative to the main body 11 while the valve core 20 acts on the valve seat portion 12, that is, the valve seat portion 12 and one end side of the main body 11 are fixed to each other by welding or the like. At this time, as viewed from the axis L direction, the welded portion W provided by the force fixing unit is provided in an annular shape without a gap between the outer peripheral surface of the flange portion 12c of the valve seat portion 12 and the inner peripheral surface of the main body 11, so that a discharge flow path that always connects the primary port 1A and the secondary port 1B via the gap between the valve seat portion 12 and the main body 11 is not formed.

[0074] The adjustment screw portion 42 can be more reliably fixed by the welded portion W, thereby reliably preventing the adjustment screw portion 42 from loosening due to vibration, impact, etc. from the external environment and the change in the valve opening pressure setting value.

[0075] <About installation of pressure regulating valve>

[0076] First, use Figure 3The shapes of the main body 11 and the piping block B are described.

[0077] The main body 11 is formed with a large diameter portion 111, a central portion 11c (reduced diameter portion), and a small diameter portion 11s, the outer diameter of which gradually decreases from one end 11d toward the other end 11u along the axis L. Here, a continuously connected reduced neck portion 11n is formed between the large diameter portion 111 and the central portion 11c. In addition, an external threaded screw joint portion 11scm that is screwed with the block component B is formed on the outer peripheral surface of the other end side of the central portion 11c.

[0078] Next, the pipe block B has an insertion hole along the axis L direction, and a primary side flow path Fp1 and an annular groove Ga are formed on one end side of the insertion hole. Here, the inner diameter of the primary side flow path Fp1 is set to be slightly larger than the outer diameter of the large diameter portion 111 of the main body 11. The secondary side flow path Fp2 formed in a direction orthogonal to the axis L direction is connected to the annular groove Ga. In addition, a plurality of annular step portions that are successively reduced in diameter in a step-like manner from the annular groove Ga toward the other end side are formed in the insertion hole along the axis L direction. The first receiving groove G1, the second receiving groove G2, the third receiving groove G3 and the fourth receiving groove G4 are sequentially formed in the plurality of annular step portions. Moreover, an annular sealing groove Gi for receiving an O-ring Or is formed on the other end side of the primary side flow path Fp1. In addition, an internal thread threaded joint Bscf is formed on the inner circumferential surface of the second receiving groove G2.

[0079] Furthermore, in the first embodiment, Figure 3 Although the shapes of the main body 11 and the piping block B are described as shown, this is just an example, and any shape may be used as long as the piping block B has an insertion hole and the main body 11 has an outer shape that can be inserted into the insertion hole.

[0080] <About installation operation>

[0081] The installation operation of the pressure regulating valve 100a to the piping block B is described. The pressure regulating valve 100a is inserted from one end side of the primary side flow path Fp1 of the piping block B along the axis L direction. Then, while the external threaded screw connection portion 11scm of the main body 11 is screwed into the internal threaded screw connection portion Bscf of the block member B, the main body 11 is moved toward the other end side in the axis L direction until the other end 11u of the main body 11 abuts against the piping block B. In the installed state of the pressure regulating valve 100a, the primary side port 1A defined by the valve seat portion 12 is connected to the primary side flow path Fp1 into which the primary side pressure P1 is introduced, and the secondary side port 1B defined by the horizontal hole 11a of the main body 11 is connected to the secondary side flow path Fp2 into which the secondary side pressure P2 is introduced. At this time, an O-ring Or is clamped between the large diameter portion 11l of the main body 11 and the annular seal groove Gi, and the gap between the main body 11 and the piping block B is sealed. Furthermore, since the caulking portion Cr of the fixing member 52 is received in the fourth receiving groove G4, interference with the piping block B is prevented.

[0082] Therefore, in the first embodiment, the adjustment thread portion 42 serving as the position adjustment portion is composed of a main body side adjustment thread portion 42a and a valve seat side adjustment thread portion 42b, which greatly simplifies the structure of the other end side of the main body 11, and can be set as a single-cylinder type in which all structures are accommodated in the main body 11 having a bottomed cylindrical shape. This can eliminate the previous problem 2 (which cannot be applied to piping blocks), and make the installation action itself simple.

[0083] In addition, in the mounted state of the pressure regulating valve 100a of the first embodiment, as shown in FIG. Figure 3 As shown, any one of the secondary ports 1B is arranged opposite to the secondary flow path Fp2, but the present invention is not limited thereto. For example, a plurality of (for example, four) secondary ports 1B are evenly arranged in the circumferential direction, and an annular groove Ga is provided between the secondary ports 1B and the secondary flow path Fp2, so that the fluid from the plurality of secondary ports 1B can smoothly flow to the secondary flow path Fp2 via the flow along the circumferential direction of the annular groove Ga, and therefore, the secondary ports 1B may not be arranged opposite to the secondary flow path Fp2. In addition, in the first embodiment, the present invention shows the case where the annular groove Ga is formed in the piping block B, but the present invention is not limited thereto. For example, the annular groove Ga may not be formed in the piping block B. In this case, an annular space is formed around the horizontal hole 11a formed in the central portion 11c by utilizing the difference in outer diameter between the large diameter portion 11l and the central portion 11c (reduced diameter portion). Therefore, as in the case of having the annular groove Ga, the fluid from the plurality of secondary side ports 1B can flow smoothly to the secondary side flow path Fp2 via the circumferential flow along the annular space.

[0084] <About the Operation of the Pressure Regulating Valve>

[0085] use Figure 4The operation of the pressure regulating valve 100a will be 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 elastic member 70 are pressed by the elastic force of the plurality of leg portions 72 in the radial direction outward, and thus have sliding resistance with respect to the inner peripheral surface 12b of the valve seat portion 12.

[0086] First, use Figure 4 (a) describes the pressure regulating valve 100a in the closed valve state. If the pressure at the primary port 1A rises, a valve opening force based on the differential pressure acts on the valve core 20. However, the valve core 20 does not leave the valve seat 12a until the valve opening force exceeds the combined force of the pressure-sensing bellows 51 and the force of the valve spring 41 and the sliding resistance in the curved portion 73 of the elastic member 70.

[0087] Next, use Figure 4 (b) describes the pressure regulating valve 100a in the valve open state. When the pressure at the primary port 1A further rises, the valve opening force acting on the valve core 20 exceeds the combined force of the pressure sensing bellows 51 and the force of the valve spring 41 and the sliding resistance in the curved portion 73 of the elastic member 70, the valve core 20 leaves the valve seat 12a, and the fluid flows from the primary port 1A to the secondary port 1B.

[0088] Furthermore, if the pressure at the primary port 1A decreases, the valve opening force acting on the valve element 20 becomes lower than the combined force of the pressure sensing bellows 51 and the valve spring 41 and the sliding resistance in the curved portion 73 of the elastic member 70, and the valve element 20 is seated on the valve seat 12a again.

[0089] In summary, in the pressure regulating valve 100a of the first embodiment, by separating the main body 11 and the valve seat 12, and providing the adjustment threaded portion 42 as the position adjustment portion on the main body 11 and the valve seat 12, respectively, the previous problem 1 (large installation space) can be eliminated. In addition, in the pressure regulating valve 100a of the first embodiment, by setting the entire structure to a single-tube type in the main body 11, the previous problem 2 (cannot be applied to the piping block) can be eliminated, and the installation operation itself becomes simple. In addition, in the pressure regulating valve 100a of the first embodiment, when viewed from the axis L direction, by arranging a pair of rotating tool insertion portions 12d on the outer peripheral side of the primary port 1A, that is, the non-circulating area, it is possible to suppress the force adjustment unit from affecting the fluid being measured, thereby eliminating concerns (deviation of the valve opening pressure setting value), and the valve opening pressure setting value can be adjusted with higher accuracy.

[0090] (Modification of Rotation Tool Insertion Portion of First Embodiment)

[0091] use Figure 5 The pressure regulating valve 100b in the modified example of the rotation tool insertion portion of the first embodiment is described. In addition, the pressure regulating valve 100b in the modified example of the rotation tool insertion portion of the first embodiment is different from the pressure regulating valve 100a of the first embodiment in that a pair of rotation tool insertion portions 12Bd have a groove shape, but the other structures are the same as the first embodiment. Here, the same symbols are marked on the same structures, and repeated descriptions are omitted.

[0092] <Concerns (threaded connection of the adjustment thread in an eccentric state)>

[0093] Here, use Figure 2 Concerns arising from the use of the force adjustment unit are described below. A predetermined threaded engagement gap is provided between the main body side adjustment thread portion 42a and the valve seat side adjustment thread portion 42b in the adjustment thread portion 42 in order to enable threaded engagement. Here, the positional accuracy of the pair of rotating tool insertion portions 12d formed on the valve seat portion 12 relative to the axis L (see Figure 2 (c)) When the installation position accuracy of the adjustment fixture is low, there is a concern that the adjustment thread portion 42 may be screwed together in an eccentric state (hereinafter referred to as "concern (screwed together in an eccentric state of the adjustment thread portion)"). At this time, in the adjustment thread portion 42, due to the bite caused by the one-sided contact, it may not be possible to move smoothly in the direction of the axis L, and the upper surface of the valve seat 12a after adjustment becomes inclined from the plane perpendicular to the axis L, and valve leakage may occur.

[0094] <About the force adjustment unit>

[0095] In this regard, Figure 5 As shown, the valve seat portion 12B in the modified example of the rotary tool insertion portion of the first embodiment has: a flange portion 12Bc, which is provided on one end side compared to the adjustment thread portion 42; and a pair of rotary tool insertion portions 12Bd, which are formed on one end surface of the flange portion 12Bc and are arranged at symmetrical positions across the axis L. The pair of rotary tool insertion portions 12Bd are formed at symmetrical positions across the axis L along a straight line orthogonal to the axis L, and have a pair of straight grooves that are open to the inner side in the radial direction and closed to the outer side in the radial direction. In addition, the pair of rotary tool insertion portions 12Bd are arranged on the outer peripheral side of the primary port 1A when viewed from the axis L direction, similarly to the pair of rotary tool insertion portions 12d of the first embodiment. In addition, the adjustment fixture (not shown) engaged with the pair of rotary tool insertion portions 12Bd is a pair of straight screwdrivers shaped to be able to fit in the direction along the respective straight grooves.

[0096] Thus, when the adjustment jig is engaged with the pair of rotating tool insertion portions 12Bd from the primary flow path side, it is possible to quickly perform alignment in the vertical direction relative to the line connecting the pair of straight grooves when viewed from the axis L, and to absorb the eccentricity error in the direction connecting the pair of straight grooves. Therefore, the threaded engagement of the adjustment threaded portion 42 can be performed smoothly and reliably, thereby eliminating concerns (threaded engagement of the adjustment threaded portion in an eccentric state), and the inclination of the upper surface of the valve seat 12a after adjustment disappears, thereby preventing valve leakage.

[0097] In summary, in the pressure regulating valve 100b of the modified example of the rotary tool insertion part of the first embodiment, similarly to the first embodiment, the previous problems 1 and 2 (large installation space, cannot be applied to the piping block) and the concerns (deviation of the valve opening pressure setting value) can be eliminated respectively. In addition, in the pressure regulating valve 100b of the modified example of the rotary tool insertion part of the first embodiment, the shape of the pair of rotary tool insertion parts 12Bd is set as a pair of straight grooves, so that the adjustment fixture can absorb the eccentricity error and quickly align the pair of rotary tool insertion parts 12Bd, thereby eliminating the concerns (threaded engagement of the adjustment threaded part in the eccentric state). As a result, the threaded engagement can be performed smoothly and reliably, and after adjustment, the inclination of the upper surface of the valve seat 12a disappears, thereby preventing valve leakage.

[0098] (Modification 1 of the Drain Flow Path of the First Embodiment)

[0099] use Figure 6 , the pressure regulating valve 100c in the modification 1 of the discharge flow path of the first embodiment is described. In addition, the pressure regulating valve 100c in the modification 1 of the discharge flow path of the first embodiment is different from the pressure regulating valve 100a of the first embodiment in that it has a discharge flow path that always communicates the primary port 1A and the secondary port 1B (a gap portion GpC without a welded portion WC), but the other structures are the same as those of the first embodiment. Among them, the same symbols are attached to the same structures, and repeated descriptions are omitted.

[0100] <About the Drainage Path>

[0101] Here, the pressure regulating valve 100a of the first embodiment is expected to have a discharge flow path depending on the intended use, for example, if it needs to be assembled in a fluid circuit that requires continuous flow without blocking the fluid, or if it needs to avoid swinging of the valve core 20 caused by expansion and contraction of the valve spring 41 when the valve is opened in an environment where the differential pressure between the primary side pressure P1 and the secondary side pressure P2 is relatively large.

[0102] In contrast, the pressure regulating valve 100c of the modified example 1 of the discharge flow path of the first embodiment is as follows: Figure 6As shown in (b), when viewed from the axis L direction, between the outer peripheral surface of the flange portion 12Cc of the valve seat portion 12 and the inner peripheral surface of the insertion hole 11i of the main body 11, a plurality of (for example, three) welding portions WC are evenly arranged in the circumferential direction by the force fixing unit. As a result, between the outer peripheral surface of the flange portion 12Cc of the valve seat portion 12 and the inner peripheral surface of the insertion hole 11i of the main body 11, a plurality of arc-shaped gap portions GpC where no welding portion WC is provided exist. In addition, as described above, the adjustment thread portion 42C (position adjustment portion) has a predetermined threaded joint clearance. Therefore, the pressure regulating valve 100c has a plurality of arc-shaped gap portions GpC and a threaded joint clearance of the adjustment thread portion 42C as a discharge flow path that always connects the primary port 1A and the secondary port 1B, so that there is no need to prepare an additional structure, etc., and the discharge flow path can be provided relatively simply.

[0103] Here, the flow path area of ​​the plurality of arc-shaped gaps GpC is set to be smaller than the flow path area of ​​the threaded joint gap in the adjustment threaded portion 42C. Thus, the discharge flow rate can be set to a desired value by adjusting the flow path area of ​​the plurality of arc-shaped gaps GpC. Specifically, Figure 6 As shown in (a), the flow area of ​​the plurality of arc-shaped gap portions GpC can be adjusted to obtain a desired discharge flow rate by making the outer diameter D2 of the flange portion 12Cc of the valve seat portion 12 appropriately smaller than the inner diameter D1 of the insertion hole 11i of the main body 11 and performing dimensional management (D2<D1).

[0104] In summary, in the pressure regulating valve 100c of the modification example 1 of the discharge flow path of the first embodiment, similarly to the first embodiment, the conventional problems 1 and 2 (large installation space, cannot be applied to the piping block) and the concern (deviation of the valve opening pressure setting value) can be eliminated respectively. In addition, in the pressure regulating valve 100c of the modification example 1 of the discharge flow path of the first embodiment, the discharge flow path is composed of a plurality of arc-shaped gaps GpC and a threaded joint gap of the adjustment threaded portion 42C, so that there is no need to prepare additional structures, etc., and the discharge flow path can be relatively simply set according to the user's purpose. In addition, in the pressure regulating valve 100c of the modification example 1 of the discharge flow path of the first embodiment, the discharge flow rate can be set to a desired value by adjusting the flow path area of ​​the plurality of arc-shaped gaps GpC.

[0105] (Modification 2 of the Drain Flow Path of the First Embodiment)

[0106] use Figure 7, the pressure regulating valve 100d in the modified example 2 of the discharge flow path of the first embodiment is described. In addition, the pressure regulating valve 100d in the modified example 2 of the discharge flow path of the first embodiment is different from the pressure regulating valve 100c in the modified example 1 of the discharge flow path of the first embodiment in that the flange portion 12Dc has a flange cutout portion 12Dn and a region having an arc-shaped welded portion WD, but the other structures are the same as those of the modified example 2 of the discharge flow path of the first embodiment. The same symbols are attached to the same structures, and repeated descriptions are omitted.

[0107] <About the Drainage Path>

[0108] like Figure 7 As shown in (b) and (c) of FIG. 1 , the pressure regulating valve 100d of the modified example 2 of the discharge flow path of the first embodiment has a flange cutout portion 12Dn at a part of the outer peripheral edge of the flange portion 12Dc of the valve seat portion 12D. Figure 7 As shown in (b), when viewed from the direction of the axis L, a welded portion WD provided by a force fixing unit is provided in an arc shape without a gap between the outer peripheral surface of the flange portion 12Dc excluding the flange cutout portion 12Dn in the valve seat portion 12D and the inner peripheral surface of the main body 11. As a result, a half-moon-shaped gap portion GpD exists in the gap between the outer peripheral surface of the flange cutout portion 12Dn and the inner peripheral surface of the main body 11. Therefore, the pressure regulating valve 100d has a half-moon-shaped gap portion GpD and a threaded clearance of the adjustment thread portion 42D (position adjustment portion) as a discharge flow path Bc that always connects the primary port 1A and the secondary port 1B (refer to Figure 7 (a)), there is no need to prepare an additional structure, and the discharge flow path Bc can be provided relatively simply.

[0109] Here, the flow path area of ​​the half-moon-shaped gap GpD is set to be smaller than the flow path area of ​​the threaded joint gap in the adjustment threaded portion 42D. Thus, the discharge flow rate can be set to a desired value by adjusting the flow path area of ​​the half-moon-shaped gap GpD. Specifically, Figure 7 As shown in (b), the flow path area of ​​the half-moon-shaped gap GpD can be adjusted to achieve a desired discharge flow rate by managing the size of the flange cutout 12Dn. In addition, the welded portion WD in the modified example 2 of the discharge flow path of the first embodiment has a larger welding area than the welded portion WC in the modified example 1 of the discharge flow path of the first embodiment, so it is possible to reliably prevent the adjustment threaded portion 42D from loosening and the valve opening pressure setting value from changing due to vibration, impact, etc. from the external environment.

[0110] In summary, in the pressure regulating valve 100d of the modified example 2 of the discharge flow path of the first embodiment, similarly to the modified example 1 of the discharge flow path of the first embodiment, the conventional problems 1 and 2 (large installation space, cannot be applied to the piping block) and the worry (deviation of the valve opening pressure setting value) can be respectively eliminated. In addition, in the pressure regulating valve 100d of the modified example 2 of the discharge flow path of the first embodiment, similarly to the modified example 1 of the discharge flow path of the first embodiment, the discharge flow path Bc is composed of the half-moon-shaped gap portion GpD and the threaded joint gap of the adjustment thread portion 42D, so that there is no need to prepare additional structures, etc., and the discharge flow path can be relatively simply set according to the user's purpose. In addition, the discharge flow rate can be set to a desired value by adjusting the flow path area of ​​the half-moon-shaped gap portion GpD. Furthermore, the weld WD in the second modification of the relief passage of the first embodiment has a larger weld area than the weld WC in the first modification of the relief passage of the first embodiment, and thus can reliably prevent the valve opening pressure setting value from changing due to loosening of the adjustment thread portion 42D.

[0111] (Variation 3 of the Drain Flow Path of the First Embodiment)

[0112] use Figure 8 , the pressure regulating valve 100e in the modified example 3 of the discharge flow path of the first embodiment is described. In addition, the pressure regulating valve 100e in the modified example 3 of the discharge flow path of the first embodiment is different from the pressure regulating valves 100c and 100d in the modified examples 1 and 2 of the discharge flow path of the first embodiment in that the thread cutout portion 42En is formed on the valve seat portion side adjustment thread portion 42Eb as the screwing clearance of the adjustment thread portion 42E (position adjustment portion), but the other structures are the same as the modified examples 1 and 2 of the discharge flow path of the first embodiment. Here, the same symbols are attached to the same structures, and repeated descriptions are omitted.

[0113] <About the Drainage Path>

[0114] like Figure 8 As shown, the pressure regulating valve 100e in the modified example 3 of the discharge flow path of the first embodiment has a thread cutout portion 42En extending in the direction of the axis L as a threaded clearance of the adjusting threaded portion 42E in the valve seat portion side adjusting threaded portion 42Eb. Thus, the threaded clearance is formed between the thread cutout portion 42En and the adjusting threaded portion 42E opposed to the thread cutout portion 42En.

[0115] The thread cutout portion 42En in the modification 3 of the discharge flow path of the first embodiment is respectively adopted in the adjustment thread portions 42C and 42D in the modification 1 and 2 of the discharge flow path of the first embodiment, so that the flow path area of ​​the thread joint gap in the adjustment thread portions 42C and 42D can be increased. Figure 6 (b)) and the flow path area of ​​the half-moon-shaped gap GpD (refer to Figure 7 (b)) can be reliably set smaller than the flow path area of ​​the threaded joint gap in the adjustment threaded portions 42C and 42D, so the desired discharge flow rate can be obtained by managing the dimensions of the multiple arc-shaped gap portions GpC and the flange cutout portions 12Dn.

[0116] In addition, in the modification example 3 of the discharge flow path of the first embodiment, the case where the threaded cutout portion 42En is provided at only one place is shown, but it is not limited to this, and a plurality of threaded cutout portions 42En may be provided. In addition, in the modification example 3 of the discharge flow path of the first embodiment, the case where the circumferential width of the threaded cutout portion 42En is relatively small is shown, but it is not limited to this. For example, as long as it functions as a threaded connection, the circumferential width of the threaded cutout portion 42En may be relatively large. Furthermore, in the modification example 3 of the discharge flow path of the first embodiment, the case where the threaded cutout portion 42En is formed by adjusting the threaded portion 42Eb on the valve seat side is shown, but it is not limited to this. For example, the threaded cutout portion may be formed by adjusting the threaded portion 42a on the body side.

[0117] In summary, in the pressure regulating valve 100e of the modified example 3 of the discharge flow path of the first embodiment, similarly to the modified examples 1 and 2 of the discharge flow path of the first embodiment, the conventional problems 1 and 2 (large installation space, cannot be applied to the piping block) and the concerns (deviation of the valve opening pressure setting value) can be respectively eliminated. In addition, in the pressure regulating valve 100e of the modified example 3 of the discharge flow path of the first embodiment, similarly to the modified examples 1 and 2 of the discharge flow path of the first embodiment, the discharge flow path is constituted by the threaded clearance of the gaps GpC and GpD and the adjustment threaded parts 42C and 42D, so that there is no need to prepare additional structures, etc., and the discharge flow path can be relatively simply provided according to the user's purpose. Furthermore, in the pressure regulating valve 100e of the modified example 3 of the discharge flow path of the first embodiment, by using the thread cutouts 42En in the adjustment threaded portions 42C and 42D of the modified examples 1 and 2 of the discharge flow path of the first embodiment, the flow path areas of the gaps GpC and GpD can be reliably set smaller than the flow path areas of the threaded engagement gaps of the adjustment threaded portions 42C and 42D. Therefore, by managing the dimensions of the plurality of arc-shaped gaps GpC and the flange cutouts 12Dn, a desired discharge flow rate can be obtained.

[0118] (Second Embodiment)

[0119] use Fig. 9 The pressure regulating valve 100f of the second embodiment is described. In addition, the pressure regulating valve 100f of the second embodiment is different from the pressure regulating valve 100a of the first embodiment in that the force fixing unit is a different structure and has a pipe block sealing unit, but the other structures are substantially the same as the pressure regulating valve 100a of the first embodiment. Here, the same symbols are marked for the same structures, and repeated descriptions are omitted. In addition, the pressure regulating valve 100f of the second embodiment does not have a discharge flow path.

[0120] Here, if Figure 3 As shown, the sealing of the gap between the pressure regulating valve 100a and the piping block B in the first embodiment is performed by clamping an O-ring Or between the large diameter portion 111 of the main body 11 and the annular sealing groove Gi when the pressure regulating valve 100a is mounted on the piping block B. When performing this mounting operation, first, after the O-ring Or is accommodated in the annular sealing groove Gi, it is necessary to insert the O-ring Or into the main body 11 by a relatively long distance. Therefore, before the O-ring Or is pressed by the large diameter portion 111 of the main body 11 and becomes a sealed state, it slides with other parts of the main body 11, and there is a concern that it will be separated from the annular sealing groove Gi and cannot be in the desired sealed state. In addition, the mounting operation of the pressure regulating valve 100a relative to the piping block B needs to be performed carefully so that the O-ring Or is arranged in the desired sealed state, and improvement is expected.

[0121] In contrast, in the pressure regulating valve 100f of the second embodiment, as in the first embodiment, the main body 11F and the valve seat portion 12F are separated, and the adjusting threaded portion 42 is provided on the main body 11F and the valve seat portion 12F, respectively, so that the conventional problem 1 (large installation space) can be eliminated, and the details will be described later. In addition, in the pressure regulating valve 100f of the second embodiment, all the structures are accommodated in the main body 11F, and a piping block sealing unit is provided, so that it can be a single-tube type that can be installed in one action, and as a result, the conventional problem 2 (cannot be applied to the piping block) can be eliminated, and the installation action itself can be made faster and simpler.

[0122] <Changes in Position Adjustment Section>

[0123] Here, in the pressure regulating valve 100f of the second embodiment, the adjusting screw portion 42 is used as the position adjusting portion as in the first embodiment, but the present invention is not limited thereto, and any structure can be used as long as it is a "structure capable of displacing the relative position of the valve seat portion and the main body in the axial direction". Here, as an example of the position adjusting portion, although not shown in the figure, a case where a sliding portion is used will be described.

[0124] The sliding portion is composed of an outer peripheral surface of one end of the valve seat portion 12F having a cylindrical shape and an inner peripheral surface of one end of the main body 11F (hereinafter referred to as a "sliding surface"). The sliding surfaces having the cylindrical shape and facing each other set their central axes on the same axis, and appropriately manage the gap between the sliding surfaces so that the sliding resistance when in contact is smaller than a predetermined value. As a result, when the sliding surfaces contact each other, the inclination relative to the axis L direction is suppressed, and one sliding surface is guided by the other sliding surface while ensuring the coaxial state, and the sliding movement in the axis L direction can be performed. In addition, a groove portion can also be provided on the sliding surface of the valve seat portion 12F. In addition, in the groove portion, it is also possible to have a straight line shape extending in the axis L direction on the other end side, and a spiral shape continuous with the straight line shape on the other end side. As a result, after the valve seat portion 12F is slid and moved relative to the main body 11F in the axis L direction to the desired adjustment position, the valve seat portion 12F is rotated relative to the main body 11F to be fitted and fixed, and as a result, the position can be adjusted.

[0125] Therefore, even if the sliding portion is adopted as the position adjusting portion, the conventional problem 1 (large installation space) and the conventional problem 2 (inapplicability to a piping block) can be solved.

[0126] Next, the urging force adjusting unit, the urging force fixing unit, and the piping block sealing unit in the pressure regulating valve 100 f according to the second embodiment will be described in order.

[0127] <About the force adjustment unit>

[0128] First, the force adjustment means for the valve body 20 rotates the valve seat 12F relative to the body 11F via the adjustment screw 42 and moves it in the direction of the axis L, thereby adjusting the force applied to the valve body 20. At this time, the valve seat 12F extends from the body 11F toward one end.

[0129] <About the force fixing unit>

[0130] After the force on the valve core 20 is adjusted by the force adjustment unit so as to open the valve at the valve opening pressure setting value, a welded portion WF is provided by the force fixing unit to fix the middle portion of the valve seat portion 12F and the one end portion 11d of the main body 11F to each other from the radially outer side by welding or the like. At this time, in the second embodiment, a pipe block sealing unit is provided at a position closer to the primary flow path side than the welded portion WF, so that a discharge flow path that always connects the primary port 1A and the secondary port 1B is not formed through the gap between the valve seat portion 12F and the main body 11F, and the details will be described later. Therefore, the welded portion WF provided by the force fixing unit between the outer peripheral surface of the middle portion of the valve seat portion 12 and the inner peripheral surface of the one end portion 11d of the main body 11F does not need to be provided in an annular shape without gaps when viewed from the radially outer side, and for example, a plurality of welded portions may be evenly arranged in the circumferential direction.

[0131] <About the Piping Block Seal Unit>

[0132] like Fig.10 As shown in FIG. 1 , the valve seat portion 12F includes a flange portion 12Fc provided at one end side relative to the valve seat portion side adjustment thread portion 42b and an outer peripheral groove 12Fg provided on the outer peripheral surface of the flange portion 12Fc. Here, a welding portion WF is provided by a force fixing means, and after the valve seat portion 12F and the main body 11F are fixed, an O-ring Or (sealing member) having an outer diameter larger than that of the flange portion 12Fc is accommodated in the outer peripheral groove 12Fg. In addition, by performing the installation operation of the pressure regulating valve 100f to the piping block Bf, the O-ring Or is clamped between the outer peripheral groove 12Fg and the piping block Bf, and the gap between the valve seat portion 12F and the piping block Bf can be sealed, and the details will be described later.

[0133] <About installation of pressure regulating valve>

[0134] First, use Fig.11 The shapes of the main body 11F and the pipe block Bf will be described.

[0135] The main body 11F has a large diameter portion 111 and a small diameter portion 11s whose outer diameter gradually decreases from one end 11d toward the other end 11u along the axis L. The large diameter portion 111 has an externally threaded portion 11scm threadedly coupled to the block member Bf formed on the outer peripheral surface of the other end side.

[0136] Next, the pipe block Bf has an insertion hole along the axis L direction, and a primary side flow path Fp1, an annular fixing groove Gf and an annular groove Ga are formed on one end side of the insertion hole. Here, the inner diameter of the annular fixing groove Gf is set to be smaller than the inner diameter of the primary side flow path Fp1 and the annular groove Ga, and slightly larger than the outer diameter of the flange portion 12Fc of the valve seat portion 12F. In addition, the secondary side flow path Fp2 formed in a direction orthogonal to the axis L direction is connected to the annular groove Ga. In addition, a plurality of annular step portions that are successively reduced in diameter in a stepped manner from the annular groove Ga toward the other end side are formed in the insertion hole along the axis L direction. The first receiving groove G1, the second receiving groove G2, the third receiving groove G3 and the fourth receiving groove G4 are sequentially formed in the plurality of annular step portions. In addition, an internal thread threaded joint Bscf is formed on the inner circumferential surface of the second receiving groove G2.

[0137] Furthermore, in the second embodiment, Fig.11 Although the shapes of the main body 11F and the piping block Bf are described as shown, this is just an example, and any shape may be used as long as the piping block Bf has an insertion hole and the main body 11F has an outer shape that can be inserted into the insertion hole.

[0138] <About installation operation>

[0139] The installation action of the pressure regulating valve 100f to the piping block Bf is described. The pressure regulating valve 100f is inserted from one end side of the primary side flow path Fp1 of the piping block Bf along the axis L direction. Then, while the external threaded threaded joint portion 11scm of the main body 11F is threadedly engaged with the internal threaded threaded joint portion Bscf of the block component Bf, it is moved toward the other end side in the axis L direction until the other end portion 11u of the main body 11F abuts against the piping block Bf. At this time, the initial O-ring Or is clamped between the outer peripheral groove 12Fg of the valve seat portion 12F and the annular fixing groove Gf of the piping block Bf, and the gap between the valve seat portion 12F and the piping block Bf is sealed. As a result, the time for the O-ring Or to contact the piping block Bf can be suppressed to a minimum, so that the O-ring Or can be suppressed from falling off from the outer peripheral groove 12Fg and causing positional deviation. In addition, by making the installation action itself a single action, it can be faster and simpler.

[0140] In summary, in the pressure regulating valve 100f of the second embodiment, similarly to the first embodiment, by separating the main body 11F and the valve seat portion 12F, and providing the adjusting thread portion 42 in the main body 11F and the valve seat portion 12F, the conventional problem 1 (large installation space) can be eliminated. In addition, in the pressure regulating valve 100f of the second embodiment, all the structures are accommodated in the main body 11F, and the piping block sealing unit is provided, so that it can be a single-tube type that can be installed in one action, and as a result, the conventional problem 2 (cannot be applied to the piping block) can be eliminated, and the installation action itself can be made faster and simpler.

[0141] <Others>

[0142] The pressure regulating valves 100a to 100f of this embodiment can be applied to all fluid devices and fluid circuits. The present invention is not limited to the above-mentioned modes, embodiments, and modifications, and can be appropriately changed and modified within the scope of the technical concept of the present invention.

Claims

1. A pressure regulating valve, characterized in that: have: a body having a secondary port; A valve seat portion, which is separate from the main body, is disposed on one end side of the main body, and has a primary side port and a valve seat; A valve core moves in the axial direction to be seated or released relative to the valve seat; a force applying unit for applying force to the valve core toward the valve seat; and a position adjustment unit capable of adjusting the force of the force applying unit, The position adjusting portion is configured to be able to displace the relative position of the valve seat portion and the main body in the axial direction.

2. The pressure regulating valve according to claim 1, characterized in that: The position adjustment part is composed of an adjustment thread part. The adjusting threaded portion is respectively disposed on the valve seat portion and the main body.

3. The pressure regulating valve according to claim 2, characterized in that: The valve seat portion has a pair of rotation tool insertion portions on one end surface, The pair of rotation tool insertion portions are arranged on the outer peripheral side of the primary port when viewed from the axial direction.

4. The pressure regulating valve according to claim 2, characterized in that: Also available: a force adjustment unit that moves the valve seat portion relative to the main body in an axial direction via the adjustment threaded portion; and The acting force fixing unit fixes the valve seat portion to the main body by the acting force adjusting unit in a state where the valve element acts on the valve seat portion.

5. The pressure regulating valve according to claim 1 or 2, characterized in that: The valve seat portion extends from the main body toward one end side, An outer peripheral groove for accommodating a sealing member is provided on an outer peripheral surface of one end portion of the valve seat portion.

6. The pressure regulating valve according to claim 4, characterized in that: The valve seat portion has a flange portion at a position closer to one end side than the adjusting thread portion. When viewed from the axial direction, there is a welding portion provided by the force fixing unit and a gap portion where the welding portion is not provided between the outer circumferential surface of the flange portion and the inner circumferential surface of the main body. A drain flow path that always communicates the primary port and the secondary port is formed by the gap portion and the threaded clearance of the adjustment thread portion.

7. The pressure regulating valve according to claim 6, characterized in that: A flange cutout portion is formed at a portion of the outer periphery of the flange portion. The gap portion is formed as a gap between an outer peripheral surface of the flange cutout portion and an inner peripheral surface of the body.

8. The pressure regulating valve according to claim 6 or 7, characterized in that: A thread cutout portion extending in the axial direction is formed on at least one of the valve seat portion and the adjustment thread portion of the body. The threaded engagement gap is formed as a gap between the thread cutout portion and the adjustment thread portion facing the thread cutout portion.

9. The pressure regulating valve according to claim 1 or 2, characterized in that: The main body has a reduced diameter portion, The reduced diameter portion has a lateral hole defining a secondary port.

Images