JP2011128778A

JP2011128778A - Pressure reducing valve

Info

Publication number: JP2011128778A
Application number: JP2009285184A
Authority: JP
Inventors: Satoyuki Fujita; 智行藤田
Original assignee: TLV Co Ltd
Current assignee: TLV Co Ltd
Priority date: 2009-12-16
Filing date: 2009-12-16
Publication date: 2011-06-30
Anticipated expiration: 2029-12-16
Also published as: JP5489692B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve for automatically excluding any foreign matter adhered to an orifice. <P>SOLUTION: A primary fluid is introduced on the basis of a deviation between a set pressure and a secondary pressure to the upper face of a piston 7 with an opened orifice 27 that communicates the upper face and lower face, to displace a piston 7, and open/close a main valve 6 connected to the piston 7. A foreign matter excluding member 28 which enters the inside of the orifice 27 according to the displacement of the piston 7 to exclude the foreign matter adhered to the orifice 27 is screwed into a valve casing. When the piston 7 is displaced downward, the foreign matter excluding member 28 enters the inside of the orifice 27, and excludes the foreign matter adhered to the orifice 27. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、蒸気や圧縮空気や液体等の流体配管系に取り付けて、弁の出口側すなわち弁の二次側の流体圧力を一定の設定圧力に保つ減圧弁に関する。 The present invention relates to a pressure reducing valve that is attached to a fluid piping system such as steam, compressed air, or liquid, and maintains the fluid pressure on the outlet side of the valve, that is, the secondary side of the valve at a constant set pressure.

従来の減圧弁は、例えば特許文献１に開示されている。これは、上面と下面を連通するオリフィスを開けたピストンの上面に設定圧力と二次側圧力との偏差に基づいて一次側流体を導入することによりピストンを変位せしめてピストンに連結した主弁を開閉操作するものである。 A conventional pressure reducing valve is disclosed in Patent Document 1, for example. This is because the main valve connected to the piston is displaced by introducing the primary fluid to the upper surface of the piston having an orifice communicating with the upper surface and the lower surface based on the deviation between the set pressure and the secondary pressure. Open / close operation.

実開平５−８６２３号公報Japanese Utility Model Publication No. 5-8623

上記従来の減圧弁においては、オリフィスの開口面積が比較的小さいために、オリフィスを流下する流体中のゴミ、錆、スケール等の遺脱がオリフィスに付着し易く次第に堆積して比較的短期間にオリフィスが詰まってしまう問題点があった。 In the above conventional pressure reducing valve, since the opening area of the orifice is relatively small, the residue of dust, rust, scale, etc. in the fluid flowing down the orifice easily adheres to the orifice and gradually accumulates in a relatively short time. There was a problem that was stuck.

したがって本発明が解決しようとする課題は、オリフィスに付着する異物を自動的に排除できる減圧弁を提供することである。 Therefore, the problem to be solved by the present invention is to provide a pressure reducing valve that can automatically remove foreign substances adhering to the orifice.

上記の課題を解決するために、本発明の減圧弁は、上面と下面を連通するオリフィスを開けたピストンの上面に設定圧力と二次側圧力との偏差に基づいて一次側流体を導入することによりピストンを変位せしめてピストンに連結した主弁を開閉操作するものにおいて、ピストンの変位によりオリフィス内に進入してオリフィスに付着した異物を排除する異物排除部材を設けたことを特徴とするものである。 In order to solve the above-described problems, the pressure reducing valve of the present invention introduces a primary fluid based on a deviation between a set pressure and a secondary pressure on an upper surface of a piston having an orifice communicating with an upper surface and a lower surface. The main valve connected to the piston is operated to open and close by displacing the piston with a piston, and is provided with a foreign matter removing member that enters the orifice due to the displacement of the piston and removes the foreign matter attached to the orifice. is there.

本発明によれば、ピストンの変位によりオリフィス内に進入してオリフィスに付着した異物を排除する異物排除部材を設けたことにより、ピストンの変位により異物排除部材がオリフィス内に進入してオリフィスに付着する異物を自動的に排除できるという効果を奏する。 According to the present invention, the foreign matter removing member that enters the orifice due to the displacement of the piston and removes the foreign matter attached to the orifice is provided, so that the foreign matter removing member enters the orifice due to the displacement of the piston and adheres to the orifice. This has the effect of automatically eliminating foreign objects.

本発明の実施の形態に係わる減圧弁の断面図である。It is sectional drawing of the pressure reducing valve concerning embodiment of this invention.

以下、本発明の実施の形態について、図１を参照して説明する。弁ケーシング１に入口２と出口３を形成し、弁ケーシング１にねじ結合した弁座部材４に弁口５を形成する。弁口５を開閉する主弁６をコイルバネ１７で閉弁方向に付勢して配置する。主弁６の上端をピストン７の接続棒８と当接させる。ピストン７の上部のピストン室９を連通路１３を介してパイロット弁室１４と接続する。パイロット弁室１４は入口圧連通路３２を介して入口２と接続する。ピストン７の外周に環状の溝を設けてシリンダ２９との間の気密を保つシール部材としてのピストンリング２６を配置する。ピストン７にその上面と下面を連通するオリフィス２７を開ける。ピストン７の下方の弁ケーシング１に異物排除部材２８をねじ結合して設ける。異物排除部材２８はピストン７が下方に変位したときにオリフィス２７内に進入してオリフィス２７に付着した異物を排除する。 Hereinafter, an embodiment of the present invention will be described with reference to FIG. An inlet 2 and an outlet 3 are formed in the valve casing 1, and a valve port 5 is formed in a valve seat member 4 screwed to the valve casing 1. The main valve 6 that opens and closes the valve port 5 is arranged by being biased by a coil spring 17 in the valve closing direction. The upper end of the main valve 6 is brought into contact with the connecting rod 8 of the piston 7. The piston chamber 9 at the upper part of the piston 7 is connected to the pilot valve chamber 14 via the communication path 13. The pilot valve chamber 14 is connected to the inlet 2 via the inlet pressure communication path 32. An annular groove is provided on the outer periphery of the piston 7 to arrange a piston ring 26 as a seal member that keeps the airtightness between the cylinder 29. An orifice 27 that opens the upper surface and the lower surface of the piston 7 is opened. A foreign substance exclusion member 28 is screwed to the valve casing 1 below the piston 7. The foreign matter removing member 28 enters the orifice 27 when the piston 7 is displaced downward, and removes the foreign matter attached to the orifice 27.

入口圧連通路３２と連通路１３の間のパイロット弁室１４に入口圧連通路３２と連通路１３とを連通遮断するパイロット弁１２を配置する。パイロット弁１２の上端は受圧応動部としてのダイヤフラム２１の下面中央部に当接する。ダイヤフラム２１の上下動に応じてパイロット弁１２を開閉して入口圧連通路３２と連通路１３とを連通遮断する。ダイヤフラム２１の一面にはダイヤフラム押え２２を介して圧力設定バネ２３の弾性力が作用している。圧力設定バネ２３の上端には鋼球２５を介して圧力調節ねじ２４を取り付ける。ダイヤフラム２１の他面の下面室３０には弁口５の二次側から連通する二次圧検出通路３１からの二次側圧力が作用している。 A pilot valve 12 that blocks communication between the inlet pressure communication path 32 and the communication path 13 is disposed in the pilot valve chamber 14 between the inlet pressure communication path 32 and the communication path 13. The upper end of the pilot valve 12 abuts on the center of the lower surface of the diaphragm 21 as a pressure receiving response portion. The pilot valve 12 is opened and closed in accordance with the vertical movement of the diaphragm 21 to cut off the communication between the inlet pressure communication path 32 and the communication path 13. The elastic force of the pressure setting spring 23 acts on one surface of the diaphragm 21 via the diaphragm retainer 22. A pressure adjusting screw 24 is attached to the upper end of the pressure setting spring 23 via a steel ball 25. The secondary side pressure from the secondary pressure detection passage 31 communicating from the secondary side of the valve port 5 acts on the lower surface chamber 30 on the other surface of the diaphragm 21.

上記の減圧弁の動作は次の通りである。出口３側の圧力が圧力設定バネ２３で設定した設定圧力よりも低下すると、圧力設定バネ２３のバネ力によりダイヤフラム２１を介してパイロット弁１２が開弁され、入口２側の高圧流体が連通路３２，１３を通ってピストン７の上面に作用してピストン７が下方へ変位する。ピストン７の変位により主弁６が弁座部材４から離座し弁口５を開口して出口３側に入口２側の高圧流体を補給することにより、出口３側の圧力が設定圧力まで上昇する。このとき、異物排除部材２８がオリフィス２７内に進入してオリフィス２７に付着した異物を排除する。設定圧力に達するとダイヤフラム２１を上方へ押し上げる荷重と、圧力設定バネ２３による押し下げ荷重がバランスしてパイロット弁１２が閉弁し、ピストン室９の高圧流体がオリフィス２７から出口３側に抜けてピストン７が上方へ変位する。ピストン７の変位により主弁６が弁座部材４に着座して弁口５を閉止する。 The operation of the pressure reducing valve is as follows. When the pressure on the outlet 3 side becomes lower than the set pressure set by the pressure setting spring 23, the pilot valve 12 is opened via the diaphragm 21 by the spring force of the pressure setting spring 23, and the high pressure fluid on the inlet 2 side is connected to the communication path. The piston 7 is displaced downward by acting on the upper surface of the piston 7 through 32 and 13. The main valve 6 is moved away from the valve seat member 4 due to the displacement of the piston 7, the valve port 5 is opened, and the high pressure fluid on the inlet 2 side is supplied to the outlet 3 side, whereby the pressure on the outlet 3 side rises to the set pressure. To do. At this time, the foreign matter removing member 28 enters the orifice 27 and removes the foreign matter attached to the orifice 27. When the set pressure is reached, the load that pushes up the diaphragm 21 upward and the push-down load by the pressure setting spring 23 are balanced, and the pilot valve 12 closes, and the high-pressure fluid in the piston chamber 9 escapes from the orifice 27 to the outlet 3 side. 7 is displaced upward. The main valve 6 is seated on the valve seat member 4 by the displacement of the piston 7 to close the valve port 5.

本発明は、流体配管系に取り付けて、弁の出口側すなわち弁の二次側の流体圧力を一定の設定圧力に保つ減圧弁に利用することができる。 The present invention can be applied to a pressure reducing valve that is attached to a fluid piping system and maintains the fluid pressure on the outlet side of the valve, that is, the secondary side of the valve at a constant set pressure.

１弁ケーシング
２入口
３出口
４弁座部材
５弁口
６主弁
７ピストン
１２パイロット弁
１７コイルバネ
２１ダイヤフラム
２３圧力設定バネ
２４圧力調節ねじ
２７オリフィス
２８異物排除部材 1 Valve casing 2 Inlet 3 Outlet 4 Valve seat member 5 Valve port 6 Main valve 7 Piston 12 Pilot valve 17 Coil spring 21 Diaphragm 23 Pressure setting spring 24 Pressure adjusting screw 27 Orifice 28 Foreign matter exclusion member

Claims

上面と下面を連通するオリフィスを開けたピストンの上面に設定圧力と二次側圧力との偏差に基づいて一次側流体を導入することによりピストンを変位せしめてピストンに連結した主弁を開閉操作するものにおいて、ピストンの変位によりオリフィス内に進入してオリフィスに付着した異物を排除する異物排除部材を設けたことを特徴とする減圧弁。 The main valve connected to the piston is opened and closed by displacing the piston by introducing the primary fluid based on the deviation between the set pressure and the secondary pressure on the upper surface of the piston having an orifice communicating with the upper surface and the lower surface. What is claimed is: 1. A pressure reducing valve, comprising: a foreign matter removing member that enters into an orifice by displacement of a piston and removes foreign matter adhering to the orifice.