JP3977194B2 - Pressure reducing valve - Google Patents

Pressure reducing valve Download PDF

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Publication number
JP3977194B2
JP3977194B2 JP2002235878A JP2002235878A JP3977194B2 JP 3977194 B2 JP3977194 B2 JP 3977194B2 JP 2002235878 A JP2002235878 A JP 2002235878A JP 2002235878 A JP2002235878 A JP 2002235878A JP 3977194 B2 JP3977194 B2 JP 3977194B2
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Japan
Prior art keywords
valve
pressure
outlet
valve body
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002235878A
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Japanese (ja)
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JP2004078422A (en
Inventor
智行 藤田
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Tlv Co Ltd
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Tlv Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/0616—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow
    • G05D16/0619—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow acting directly on the obturator

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Details Of Valves (AREA)
  • Control Of Fluid Pressure (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は蒸気や圧縮空気配管系に取り付けて、出口側圧力を入口側圧力よりも低い所望の設定圧力に維持する減圧弁に関する。
【０００２】
【従来の技術】
従来の減圧弁は例えば実開昭５８−２８３１２号公報に示されている。ここに示されたものは、弁ケーシングに入口と出口を形成し、入口と出口を連通する弁口を開けた弁座を弁ケーシングに取り付け、弁口を開閉する弁体を弁口の下方に弁体ばねで閉弁方向に付勢して配置し、出口側圧力と圧力設定部材の設定力との偏差に基づいて変位する圧力応動部材により弁体を駆動して弁口を開閉するものにおいて、弁体と弁体ばねを囲って円筒状のスクリーンを配置し、弁座と弁ケーシングの底壁の間にスクリーンを挟んで固定したものである。
【０００３】
【発明が解決しようとする課題】
上記従来の減圧弁においては、弁座と弁ケーシングの底壁との間の寸法に対してスクリーンが長い場合に、スクリーンを弁座と弁ケーシングの底壁の間にスクリーンを挟んで固定することができない問題点があった。
【０００４】
従って本発明の技術的課題は、弁座と弁ケーシングの底壁の間にスクリーンを確実に挟んで固定できる減圧弁を提供することである。
【０００５】
【課題を解決するための手段】
上記の技術的課題を解決するために講じた本発明の技術的手段は、弁ケーシングに入口と出口を形成し、入口と出口を連通する弁口を開けた弁座を弁ケーシングに固定し、弁口を開閉する弁体を弁口の下方に弁体ばねで閉弁方向に付勢して配置し、出口側圧力と圧力設定部材の設定力との偏差に基づいて変位する圧力応動部材により弁体を駆動して弁口を開閉する減圧弁であって、弁体と弁体ばねを囲って円筒状のスクリーンを配置したものにおいて、弁座の下端面に外方に向かって上方に拡がるテーパー面を形成し、弁座の不動のテーパー面と弁ケーシングの不動の底壁との間にスクリーンを挟んで固定したことを特徴とする減圧弁にある。
【０００６】
【発明の実施の形態】
本発明は、弁座の下端面に外方に向かって上方に拡がるテーパー面を形成し、弁座の不動のテーパー面と弁ケーシングの不動の底壁との間にスクリーンを挟んで固定したものである。そのため、弁座と弁ケーシングの底壁との間の寸法に対してスクリーンが長い場合であっても、スクリーンの上端が弁座のテーパー面に沿って外方に拡がることにより、弁座と弁ケーシングの底壁の間にスクリーンを確実に挟んで固定することができる。
【０００７】
【実施例】
上記の技術的手段の具体例を示す実施例を説明する（図１参照）。
図１は本発明による減圧弁の実施例の断面図である。減圧弁の弁ケーシングは、本体１と本体１に締結した蓋２とから成る。本体１の上部と蓋２の間に圧力設定部材としてのコイル状の圧力設定ばね３と圧力応動部材としてのベローズ４を配置する。
【０００８】
本体１に入口５と出口６を形成し、入口５と出口６の間に弁座７を固定し、弁座７に形成した弁口８を通して入口５と出口６を連通する。弁口８の下方に弁口８を開閉する弁体９を配置する。弁体９の上面にほぼ円錐状の凹面１０を形成する。弁体９の上方に操作棒１１を配置する。操作棒１１の下端面にほぼ半球状の凸面１２を形成する。弁体９の円錐状の凹面１０に操作棒１１の半球状の凸面１２を当接させる。操作棒１１の上端は下部ばね受け１３の収容孔１４に収容する。操作棒１１の上部はスナップリング１５で本体１に固定した案内部材１６の案内孔１７で上下に摺動自在に案内する。案内部材１６に出口６側圧力を導入する連通孔１８を形成する。
【０００９】
弁体９と本体１の底壁の間に弁体９を閉弁方向に付勢するコイル状の弁体ばね１９を配置する。弁体９と弁体ばね１９を囲って円筒状のスクリーン２０を配置する。スクリーン２０は、弁座７の下端面に形成した外方に向かって上方に拡がるテーパー面２１と、本体１の底壁に形成した段部２２の間に挟んで固定する。
【００１０】
蓋２の天井壁に調節ねじ２３を取り付け、ロックナット２４で回り止めをする。調節ねじ２３の下部に抜け出し防止用のスナップリング２５を取り付ける。調節ねじ２３の内端は球体２６と上部ばね受け２７を介して圧力設定ばね３の上端に接する。圧力設定ばね３の下端は下部ばね受け１３の上端に接する。ベローズ４の上端は蓋２と本体１の間に固定したリング状の取付部材２８に固定し、下端は下部ばね受け１３の外周に固定して閉塞する。
【００１１】
次に上記実施例の作用を説明する。出口６側の圧力が設定圧力よりも低下すると、ベローズ４は圧力設定ばね３のばね力により収縮し、弁体ばね１９のばね力に抗して操作棒１１を介して弁体９を下方に変位させて弁口８を開口する。弁口８の開口により入口５側の高圧の流体が出口６側に供給され、出口６側の圧力が回復する。出口６側の圧力が所望値まで回復すると、ベローズ４は伸張して元の位置に戻り、弁体９は弁体ばね１９のばね力により弁口８を閉口する。
【００１２】
【発明の効果】
本発明は、弁座の下端面に外方に向かって上方に拡がるテーパー面を形成したものであるので、入口から弁座と弁体との間に向かう流体の流路が拡がり、流量が多くなるという優れた効果を生じる。
【図面の簡単な説明】
【図１】本発明による減圧弁の実施例の断面図である。
【符号の説明】
１ 本体
２ 蓋
３ 圧力設定ばね
４ ベローズ
５ 入口
６ 出口
７ 弁座
８ 弁口
９ 弁体
１９ 弁体ばね
２０ スクリーン
２１ テーパー面
２２ 段部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure reducing valve that is attached to a steam or compressed air piping system and maintains an outlet side pressure at a desired set pressure lower than an inlet side pressure.
[0002]
[Prior art]
A conventional pressure reducing valve is disclosed, for example, in Japanese Utility Model Laid-Open No. 58-28312. What is shown here is that the valve casing is formed with an inlet and an outlet, a valve seat that opens the valve port that connects the inlet and the outlet is attached to the valve casing, and a valve body that opens and closes the valve port is located below the valve port. A valve body spring that is urged in the valve closing direction and that opens and closes the valve port by driving the valve body with a pressure responsive member that is displaced based on the deviation between the outlet side pressure and the set force of the pressure setting member. A cylindrical screen is disposed so as to surround the valve body and the valve body spring, and is fixed by sandwiching the screen between the valve seat and the bottom wall of the valve casing.
[0003]
[Problems to be solved by the invention]
In the conventional pressure reducing valve, when the screen is long with respect to the dimension between the valve seat and the bottom wall of the valve casing, the screen is fixed with the screen sandwiched between the valve seat and the bottom wall of the valve casing. There was a problem that could not be.
[0004]
Therefore, the technical problem of the present invention is to provide a pressure reducing valve that can be fixed by sandwiching a screen between the valve seat and the bottom wall of the valve casing.
[0005]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem is to form an inlet and an outlet in the valve casing, and fix a valve seat having a valve opening communicating the inlet and the outlet to the valve casing; A valve body that opens and closes the valve port is urged in the valve closing direction by a valve body spring below the valve port, and is displaced by a pressure responsive member that is displaced based on the deviation between the outlet side pressure and the set force of the pressure setting member. A pressure reducing valve that opens and closes a valve port by driving a valve body, in which a cylindrical screen is disposed so as to surround the valve body and the valve body spring, and expands upward toward the lower end surface of the valve seat. The pressure reducing valve is characterized in that a tapered surface is formed and a screen is sandwiched between the fixed tapered surface of the valve seat and the fixed bottom wall of the valve casing.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a tapered surface that extends upward outward is formed on the lower end surface of the valve seat, and is fixed by sandwiching a screen between the fixed tapered surface of the valve seat and the fixed bottom wall of the valve casing. It is. Therefore, even when the screen is long relative to the dimension between the valve seat and the bottom wall of the valve casing, the upper end of the screen extends outward along the tapered surface of the valve seat, so that the valve seat and the valve The screen can be securely sandwiched and fixed between the bottom walls of the casing.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
FIG. 1 is a sectional view of an embodiment of a pressure reducing valve according to the present invention. The valve casing of the pressure reducing valve includes a main body 1 and a lid 2 fastened to the main body 1. A coil-shaped pressure setting spring 3 as a pressure setting member and a bellows 4 as a pressure responsive member are disposed between the upper portion of the main body 1 and the lid 2.
[0008]
An inlet 5 and an outlet 6 are formed in the main body 1, a valve seat 7 is fixed between the inlet 5 and the outlet 6, and the inlet 5 and the outlet 6 are communicated with each other through a valve port 8 formed in the valve seat 7. A valve body 9 for opening and closing the valve port 8 is disposed below the valve port 8. A substantially conical concave surface 10 is formed on the upper surface of the valve body 9. An operating rod 11 is disposed above the valve body 9. A substantially hemispherical convex surface 12 is formed on the lower end surface of the operation rod 11. The hemispherical convex surface 12 of the operating rod 11 is brought into contact with the conical concave surface 10 of the valve body 9. The upper end of the operation rod 11 is accommodated in the accommodation hole 14 of the lower spring receiver 13. The upper portion of the operation rod 11 is guided by a guide hole 17 of a guide member 16 fixed to the main body 1 by a snap ring 15 so as to be slidable up and down. A communication hole 18 for introducing the outlet 6 side pressure is formed in the guide member 16.
[0009]
Between the valve body 9 and the bottom wall of the main body 1, a coiled valve body spring 19 that urges the valve body 9 in the valve closing direction is disposed. A cylindrical screen 20 is disposed around the valve body 9 and the valve body spring 19. The screen 20 is fixed by being sandwiched between a tapered surface 21 formed on the lower end surface of the valve seat 7 and expanding upward and a stepped portion 22 formed on the bottom wall of the main body 1.
[0010]
An adjustment screw 23 is attached to the ceiling wall of the lid 2, and the lock nut 24 is used to prevent rotation. A snap ring 25 is attached to the lower part of the adjusting screw 23 to prevent it from coming out. The inner end of the adjusting screw 23 is in contact with the upper end of the pressure setting spring 3 via the sphere 26 and the upper spring receiver 27. The lower end of the pressure setting spring 3 is in contact with the upper end of the lower spring receiver 13. The upper end of the bellows 4 is fixed to a ring-shaped attachment member 28 fixed between the lid 2 and the main body 1, and the lower end is fixed to the outer periphery of the lower spring receiver 13 and closed.
[0011]
Next, the operation of the above embodiment will be described. When the pressure on the outlet 6 side is lower than the set pressure, the bellows 4 is contracted by the spring force of the pressure setting spring 3, and the valve body 9 is moved downward via the operation rod 11 against the spring force of the valve body spring 19. The valve port 8 is opened by being displaced. Due to the opening of the valve port 8, the high-pressure fluid on the inlet 5 side is supplied to the outlet 6 side, and the pressure on the outlet 6 side is restored. When the pressure on the outlet 6 side recovers to a desired value, the bellows 4 expands and returns to the original position, and the valve body 9 closes the valve port 8 by the spring force of the valve body spring 19.
[0012]
【The invention's effect】
In the present invention, the lower end surface of the valve seat is formed with a tapered surface that extends upward outward, so that the fluid flow path from the inlet to the valve seat and the valve body expands, and the flow rate is large. This produces an excellent effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a pressure reducing valve according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Pressure setting spring 4 Bellows 5 Inlet 6 Outlet 7 Valve seat 8 Valve port 9 Valve body 19 Valve body spring 20 Screen 21 Tapered surface 22 Step part

Claims (1)

弁ケーシングに入口と出口を形成し、入口と出口を連通する弁口を開けた弁座を弁ケーシングに固定し、弁口を開閉する弁体を弁口の下方に弁体ばねで閉弁方向に付勢して配置し、出口側圧力と圧力設定部材の設定力との偏差に基づいて変位する圧力応動部材により弁体を駆動して弁口を開閉する減圧弁であって、弁体と弁体ばねを囲って円筒状のスクリーンを配置したものにおいて、弁座の下端面に外方に向かって上方に拡がるテーパー面を形成し、弁座の不動のテーパー面と弁ケーシングの不動の底壁との間にスクリーンを挟んで固定したことを特徴とする減圧弁。An inlet and outlet are formed in the valve casing, the valve seat that opens the valve port that connects the inlet and outlet is fixed to the valve casing, and the valve body that opens and closes the valve port is closed by a valve spring under the valve port A pressure reducing valve that opens and closes the valve port by driving the valve body by a pressure responsive member that is displaced based on a deviation between the outlet side pressure and the set force of the pressure setting member, In the case where a cylindrical screen is arranged so as to surround the valve body spring, a tapered surface extending outward is formed on the lower end surface of the valve seat, and the stationary taper surface of the valve seat and the stationary bottom of the valve casing are formed. A pressure reducing valve characterized by being fixed with a screen sandwiched between walls .
JP2002235878A 2002-08-13 2002-08-13 Pressure reducing valve Expired - Fee Related JP3977194B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002235878A JP3977194B2 (en) 2002-08-13 2002-08-13 Pressure reducing valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002235878A JP3977194B2 (en) 2002-08-13 2002-08-13 Pressure reducing valve

Publications (2)

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JP2004078422A JP2004078422A (en) 2004-03-11
JP3977194B2 true JP3977194B2 (en) 2007-09-19

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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109323027A (en) * 2018-11-28 2019-02-12 北京控制工程研究所 A kind of capsule stack and absolute pressure formula pressure reducer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101497310B1 (en) * 2014-01-24 2015-03-02 공주대학교 산학협력단 Bellows Stroke Controller of Auto Vehicle Eletromagnatic Control Valve And Operation Method Of The Same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109323027A (en) * 2018-11-28 2019-02-12 北京控制工程研究所 A kind of capsule stack and absolute pressure formula pressure reducer
CN109323027B (en) * 2018-11-28 2020-07-14 北京控制工程研究所 Diaphragm capsule subassembly and absolute pressure formula pressure reducer

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