JP3974380B2 - Relief valve - Google Patents

Relief valve Download PDF

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Publication number
JP3974380B2
JP3974380B2 JP2001341750A JP2001341750A JP3974380B2 JP 3974380 B2 JP3974380 B2 JP 3974380B2 JP 2001341750 A JP2001341750 A JP 2001341750A JP 2001341750 A JP2001341750 A JP 2001341750A JP 3974380 B2 JP3974380 B2 JP 3974380B2
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Japan
Prior art keywords
valve
diaphragm
spring
lid
flow path
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JP2001341750A
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JP2003148640A (en
Inventor
真之 菱田
真 加藤
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兼工業株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、温水機器用の逃し弁に関する。
【0002】
【従来の技術】
従来、この種の逃し弁には、手動作動機構を設けられている。
ダイヤフラム式の逃し弁では、弁箱に設けた入口及び出口に通ずる一次側流路と二次側流路とが連通する弁口を開閉するダイヤフラム弁が設けられており、該ダイヤフラム弁に係脱自在な弁軸を、弁体を閉弁方向へ付勢する調節バネを押圧する様にバネカバー内に上下動自在に螺着した調節ネジと、該調節ネジの上方でバネカバーの上端開口部に被冠する蓋体の夫々に挿通すると共に、該蓋体の上方突出する弁軸の突端に手動レバーの基端を枢着して手動作動機構が構成されている。
そして、ダイヤフラム弁が一次側と二次側を連通する様に開弁するか否かを定期的に確認する(以下、作動確認と称する。)時に、通常使用時に水平であった手動レバーの先端を上方へ押し上げて蓋体上面に直立させることにより、弁軸に対する手動レバーの枢着点が弁軸の軸線上で上方へ移動し、弁軸を上動させる。これにより、弁軸がダイヤフラム弁を係合して調節バネの弾性力に抗し開弁方向へ強制的に変位させ、弁口を介して一次側流路と二次側流路を連通させる。
【0003】
【発明が解決しようとする課題】
ところで、上記逃し弁の組み立てにおいては、調節ネジの上下位置を調整することにより、これに押圧される調節バネの弾性力を加減して逃し弁の設定圧力を設定し、この後蓋体でバネカバーの上端開口部を被冠し、該バネカバー上方に突出した弁軸突端に割りピンで以て手動レバーを枢着するのである。
調節ネジの位置調整に当たっては、穂先が二股フォーク状のネジ回しによって調節ネジを回転させることで成される。
即ち、調節ネジ上面の一直径線上に設けた凹溝状のすりわりの中間部位(調節ネジの中心に相当)に弁軸が直交状に挿通しているため、弁軸に干渉することなく、前記すりわりの左右端部側に二股フォーク状の穂先の夫々を挿入してネジ回しを回転操作することで調節ネジを上下動させる様にしている。
しかしながら、逃し弁の組み立て後の最終的な試験で設定圧力を満たしていない場合、割りピンを引き抜いて手動レバー及び蓋体を取り外し、上記ネジ回しにて調節ネジの上下位置を設定し直し、再度、蓋体等を組み付けねばならず、その作業に手間、時間を要するため、作業効率が悪いといった課題を有していた。
【0004】
【課題を解決するための手段】
本発明は、上記課題に鑑み、弁箱内の一次側流路と二次側流路とが連通する弁口を開閉する弁体に係脱自在な弁軸を、弁体を閉弁方向へ付勢する調節バネを押圧する様にバネカバー内に上下動自在に螺着した調節ネジと、該調節ネジの上方でバネカバーの上端開口部に回転自在に被冠する蓋体との夫々に挿通すると共に、該蓋体の上方に突出した弁軸の突端に手動レバーを枢着した逃し弁において、調節ネジの上面に設けたネジ回し用の凹部に対応して蓋体にネジ回し用の案内孔を貫設した逃し弁を提供し、逃し弁の組み立て後に設定圧力を調節する必要がある場合、調節ネジのネジ回しの先端を蓋体に設けた案内孔より挿入して調節ネジの上面に設けたネジ回し用の凹部に嵌め、蓋体等を取り外して逃し弁を分解することなく、調節ネジを上下動させられる様にして、上記課題を解決する。
【0005】
【発明の実施の形態】
以下本発明の一実施例を図面に基づいて説明する。
図に示すダイヤフラム式の逃し弁1は、弁箱2とバネカバー3とを組み付けて成り、弁箱2は、その側方及び下部に流入口4及び流出口5を開設すると共に、内部に流入口4及び流出口5に通ずる一次側流路6と二次側流路7とを設けている。
一次側流路6と二次側流路7とが連通する弁口8は、二次側流路7と同軸線上で上向きに開口形成している。
又、弁箱2上部は開口形成され、この開口部はダイヤフラム9にて閉塞されると共に、該ダイヤフラム9上に上下が開口した略ハット型のバネカバー3を被冠して弁箱2上に固定しており、ダイヤフラム9にて弁箱2とバネカバー3の各内部を区画している。
【0006】
ダイヤフラム9の下部中央には弁口8を開閉する弁体10を一体形成してダイヤフラム弁11と成しており、その弁体10が弁口8を閉塞することにより一次側流路6と二次側流路7とを区画している。
ダイヤフラム9の上面には有底筒状のダイヤフラム受け12の底部12aを載置すると共に、ダイヤフラム受け12とダイヤフラム9とを弁体10(ダイヤフラム9下部)の中心より挿通したリベット13にて接合固定しており、該リベット13は先端部(かしめ部に相当)より軸線方向に長い軸孔13aを穿設している。
ダイヤフラム受け12の一直径線上に存する周壁12bの所定高さ部位には、中心に指向する略舌状の突片14を切り起し形成している。
そして、ダイヤフラム受け12上には、突片14を介してダイヤフラム弁11に係脱自在な弁軸15を設けている。
【0007】
弁軸15は、その下端に軸孔13aに摺動自在に挿入される所定長さの小径軸部15aを設けた逆円錐部15bと、該逆円錐部15bの円形平坦面中央に立ち上がり形成した前記円形平坦面より小径な円柱状の長軸部15cとから成り、該長軸部15cの下端には、その周囲の環状面部15dで抜止めされる略ハット型のバネ受け16を外嵌している。
バネ受け16の鍔部16aの外径は、突片14の先端間距離より大径にして、弁体10が弁口8を閉塞した状態で、突片14と鍔部16aの外周縁部とは上下に離間する様に設定している。
又、外径が突片14の先端間距離より小径にして、且つ内径がバネ受け16の凸部16bの外径より若干大径な圧縮コイル状の調節バネ17をバネ受け16上に直立配置すると共に、調節バネ17の上端には、これを弁体10の閉弁方向へ付勢する様に押圧する調節ネジ18をバネカバー3上方の円筒部3a内に上下動自在に螺着している。
【0008】
調節ネジ18は、略円板状に形成し、その外周に円筒部3a内周に螺刻した雌ネジに螺着する雄ネジ(図4、5中では省略)を螺刻すると共に、その中心に長軸部15cを摺動自在に挿通した支持孔18aを貫設して成り、その下面には調節バネ17の上端を外嵌した円形凸部18bを設け、上面の一直径線上には、ネジ回しS用の一条の凹部18cを設けている。
又、バネカバー3における円筒部3aの上端開口部3bには、これに被冠する蓋体19を設け、該蓋体19上面の中心には長軸部15cを摺動自在に挿通した支持孔19aと、調節ネジ18の凹部18cに対応、即ち凹部18c上方でこれと同一線上にして、且つ凹部18cの幅と同径と成した一対のネジ回しS用の案内孔19bを、支持孔19aを対称中心として相互に対称な位置に貫設している。
尚、蓋体19は上端開口部3bを単に被冠しているに過ぎず、弁軸15を中心に回転自在と成している。
そして、蓋体19の上方に突出した弁軸15の突端15eに、弁軸15を上下動させる手動レバー20を割りピン21で以て枢着している。
【0009】
手動レバー20は、所定長さを有する断面略コ字状に形成して成り、図1に示す倒伏状態において、その基端部20aの上面20bと突端15eとの間に所定の隙間を有する様に、基端部20aの左右側壁20c間に突端15eを配して支軸となる割りピン21を挿通し、手動レバー20を起立させる様に引き起し動作する時に基端部20a上面20bが突端15eに接触しない様に成し、基端部20aの端面20dと支軸21間距離を、蓋体19と支軸21間距離よりも長く設定し、図2に示す如く、基端部20a端面20dが蓋体19上面に接触する様に手動レバー20を起立させた状態で、支軸21の位置を手動レバー倒伏時よりも上方へ変位させて弁軸15を吊り上げ保持し、該弁軸15に装着したバネ受け16の鍔部16aがダイヤフラム受け12の突片14を係合してダイヤフラム9と共に弁体10を弁口8より離間させる様に成している。
又、手動レバー20において、基端部20a端面20dと左右側壁20cの下端が交差する部位20eは円弧状に形成し、この円弧部20eが手動レバー20の回動操作時に蓋体19上面を摺接する様に成している。
【0010】
ネジ回しSは、その柄部より軸線方向に突設した軸部を介して六角柱状の穂先支持部を設け、該穂先支持部より所定長さの一対の穂先部S1を平行に突設しており、該穂先部S1は、凹部18cの幅に対応した丸棒状に形成され、穂先部S1の間隔及び断面形状に対応する様に案内孔19bは上記の如く蓋体19に貫設されている。
【0011】
次に逃し弁1の作用について説明する。
上記構成の逃し弁1の組み立て後において、最終試験によって、設定圧力を満たしていないものにあっては、調節バネ17の弾性力の再調整のため、逃し弁1を設定圧力試験装置に接続する。
そして、蓋体19の案内孔19bが調節ネジ18の凹部18cと同一線上に配する様に、蓋体19を回転させ、かかる位置決め後、ねじ回しSの穂先部S1の先端を案内孔19bを通して凹部18cに挿入し、ねじ回しSを適宜方向へ回転することにより、調節ネジ18を上動又は下動させ、設定圧力を満たす様に、調節バネ17の弾性力を調整する(図4〜6参照)。
上記のねじ回しSの回転時には、蓋体19も同様に回転し、手動レバー20もその側壁20cに蓋体19より上方突出している穂先部S1が当接するため、同方向へ弁軸15と共に回転することとなる。
【0012】
又、温水機器に取付けられた逃し弁1の作動等について説明する。
逃し弁1の一次側流路6の圧力が上昇して調節バネ17により設定された圧力に達した時、調節バネ17の弾性力に抗してダイヤフラム9が開弁方向へ押圧され、弁体10が弁口8より離間して開弁し、一次側流路6から二次側流路7へ流体が流動し、その後一次側圧力が設定圧力より降下すると、調節バネ17によりダイヤフラム9が閉弁方向へ変位して閉弁する。
逃し弁1の作動確認時には、通常は倒伏状態の手動レバー20を回動操作して蓋体19上に起立させ、調節バネ17の弾性力に抗して弁軸15を吊り上げ保持することにより、弁軸15と共に上動するバネ受け16が突片14に係合して弁体10を弁口8より離間させて強制開弁し、作動確認後、手動レバー20を倒伏状態に復帰させることにより閉弁させる。
【0013】
【発明の効果】
要するに本発明は、上記構成から成る逃し弁1において、調節ネジ18の上面に設けたネジ回しS用の凹部18cに対応して蓋体19にネジ回しS用の案内孔19bを貫設したので、逃し弁1の組み立て後において、最終試験で設定圧力を満たしていないものにあっては、ネジ回しSの穂先部S1を蓋体19の案内孔19bを通して調節ネジ18の凹部18cに挿入することにより、従来の様に、割りピン21、手動レバー20及び蓋体19を外すことなく、ネジ回しSで調節ネジ18を回転させて上下動させることが出来、調節バネ17のダイヤフラム弁11に対する弾性力を簡便に調整できる。
従って、本発明によれば、その組み立て時における作業効率を飛躍的に向上させられ、延いては、逃し弁1を安価に提供できる等その実用的効果甚だ大である。
【図面の簡単な説明】
【図1】逃し弁の縦断面図である。
【図2】作動確認時の逃し弁の縦断面図である。
【図3】図1の平面図である。
【図4】ねじ回しの穂先部を調節ネジの凹部に挿入した状態を示す逃し弁の縦断面図である。
【図5】図4の一部破断右側面図である。
【図6】図4のAーA断面図である。
【符号の説明】
1 逃し弁
2 弁箱
3 バネカバー
3b 上端開口部
6 一次側流路
7 二次側流路
8 弁口
11 ダイヤフラム弁
15 弁軸
15e 突端
17 調節バネ
18 調節ネジ
18c 凹部
19 蓋体
19b 案内孔
20 手動レバー
S ネジ回し
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a relief valve for hot water equipment.
[0002]
[Prior art]
Conventionally, this type of relief valve is provided with a manual operating mechanism.
A diaphragm type relief valve is provided with a diaphragm valve that opens and closes a valve port that communicates with a primary side channel and a secondary side channel that communicate with an inlet and an outlet provided in a valve box. An adjustable valve shaft is attached to an upper end opening of the spring cover above the adjustment screw and an adjustment screw screwed up and down in the spring cover so as to press an adjustment spring that biases the valve body in the valve closing direction. A manual actuating mechanism is configured by inserting the base end of the manual lever to the protruding end of the valve shaft protruding above the lid, and inserting the base end of the manual lever.
Then, when periodically checking whether the diaphragm valve opens so as to communicate the primary side and the secondary side (hereinafter referred to as operation check), the tip of the manual lever that was horizontal during normal use Is pushed upward to stand upright on the upper surface of the lid body, whereby the pivot point of the manual lever with respect to the valve shaft moves upward on the axis of the valve shaft, and the valve shaft is moved up. As a result, the valve shaft engages the diaphragm valve and forcibly displaces it in the valve opening direction against the elastic force of the adjusting spring, thereby communicating the primary side flow path and the secondary side flow path via the valve port.
[0003]
[Problems to be solved by the invention]
By the way, in assembling the above relief valve, by adjusting the vertical position of the adjusting screw, the elastic force of the adjusting spring pressed against it is adjusted to set the set pressure of the relief valve. A manual lever is pivotally attached with a split pin to a valve shaft protruding end protruding above the spring cover.
In adjusting the position of the adjusting screw, the tip is rotated by rotating the adjusting screw with a fork-like screwdriver.
That is, since the valve shaft is inserted perpendicularly into a grooved intermediate portion (corresponding to the center of the adjusting screw) provided on one diameter line on the upper surface of the adjusting screw, without interfering with the valve shaft, The adjusting screw is moved up and down by inserting a bifurcated fork-shaped tip into the left and right end portions of the slide and rotating the screwdriver.
However, if the set pressure is not satisfied in the final test after assembling the relief valve, pull out the split pin, remove the manual lever and the lid, reset the vertical position of the adjustment screw with the above screwdriver, and again In addition, the lid body and the like must be assembled, and the work requires time and effort, so that the work efficiency is poor.
[0004]
[Means for Solving the Problems]
In view of the above problems, the present invention provides a valve shaft that can be freely engaged with and disengaged from a valve body that opens and closes a valve port in which a primary flow path and a secondary flow path in a valve box communicate with each other. Inserted into the adjustment screw screwed up and down in the spring cover so as to press the adjustment spring to be urged, and the lid body that is rotatably crowned on the upper end opening of the spring cover above the adjustment screw. In addition, in the relief valve in which the manual lever is pivotally attached to the protruding end of the valve shaft protruding above the lid body, a guide hole for screwing the lid body corresponding to the screw recess provided on the upper surface of the adjustment screw If the set pressure needs to be adjusted after the relief valve is assembled, the tip of the adjustment screw is inserted through the guide hole provided in the lid and provided on the upper surface of the adjustment screw. Insert the adjustment screw into the recess for turning the screw without removing the lid and disassembling the relief valve. In the manner it is moved downward, to solve the above-mentioned problems.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
A diaphragm type relief valve 1 shown in FIG. 1 is formed by assembling a valve box 2 and a spring cover 3. The valve box 2 has an inlet 4 and an outlet 5 at its side and lower part, and an inlet at the inside. 4 and the flow path 5 are provided with a primary flow path 6 and a secondary flow path 7.
A valve port 8 through which the primary flow path 6 and the secondary flow path 7 communicate with each other is formed so as to open upward on the same axis as the secondary flow path 7.
The upper part of the valve box 2 is formed with an opening. The opening is closed by a diaphragm 9 and is fixed on the valve box 2 by covering the diaphragm 9 with a substantially hat-shaped spring cover 3 that opens up and down. The diaphragm 9 separates the insides of the valve box 2 and the spring cover 3.
[0006]
A valve body 10 for opening and closing the valve port 8 is integrally formed at the lower center of the diaphragm 9 to form a diaphragm valve 11, and the valve body 10 closes the valve port 8 so that the primary flow path 6 and the second flow path 6 are closed. A secondary flow path 7 is partitioned.
A bottom portion 12a of a bottomed cylindrical diaphragm receiver 12 is placed on the upper surface of the diaphragm 9, and the diaphragm receiver 12 and the diaphragm 9 are joined and fixed by a rivet 13 inserted from the center of the valve body 10 (lower diaphragm 9). The rivet 13 has an axial hole 13a that is longer in the axial direction than the tip (corresponding to the caulking portion).
At a predetermined height portion of the peripheral wall 12b existing on one diameter line of the diaphragm receiver 12, a substantially tongue-shaped projecting piece 14 directed to the center is cut and formed.
On the diaphragm receiver 12, a valve shaft 15 that can be engaged with and disengaged from the diaphragm valve 11 is provided via a projecting piece 14.
[0007]
The valve shaft 15 is formed with an inverted conical portion 15b having a small-diameter shaft portion 15a having a predetermined length slidably inserted into the shaft hole 13a at the lower end thereof, and rising at the center of the circular flat surface of the inverted conical portion 15b. A cylindrical long shaft portion 15c having a diameter smaller than that of the circular flat surface, and a substantially hat-shaped spring receiver 16 that is secured to the lower end of the long shaft portion 15c by an annular surface portion 15d. ing.
The outer diameter of the flange 16a of the spring receiver 16 is larger than the distance between the tips of the protrusions 14, and the valve element 10 closes the valve port 8, and the protrusion 14 and the outer peripheral edge of the flange 16a Are set so as to be separated from each other vertically.
Further, a compression coil-shaped adjustment spring 17 whose outer diameter is smaller than the distance between the tips of the projecting pieces 14 and whose inner diameter is slightly larger than the outer diameter of the convex portion 16b of the spring receiver 16 is arranged upright on the spring receiver 16. At the same time, an adjustment screw 18 is attached to the upper end of the adjustment spring 17 so as to be movable up and down in the cylindrical portion 3a above the spring cover 3 to press the adjustment spring 17 so as to urge the valve body 10 in the valve closing direction. .
[0008]
The adjusting screw 18 is formed in a substantially disc shape, and a male screw (not shown in FIGS. 4 and 5) that is screwed onto a female screw threaded on the inner periphery of the cylindrical portion 3 a is threaded on the outer periphery of the adjusting screw 18. Is formed by penetrating a support hole 18a through which the long shaft portion 15c is slidably inserted, and a circular convex portion 18b is provided on the lower surface of the adjustment spring 17 so that the upper end of the adjustment spring 17 is externally fitted. A single recess 18c for the screwdriver S is provided.
Further, a cover body 19 is provided at the upper end opening 3b of the cylindrical portion 3a of the spring cover 3, and a long hole 15c is slidably inserted into the center of the top surface of the cover body 19 so as to be slidable. And a guide hole 19b for a screwdriver S corresponding to the recess 18c of the adjusting screw 18, that is, above the recess 18c and on the same line as the width of the recess 18c. It penetrates in mutually symmetrical positions as a center of symmetry.
The lid body 19 merely covers the upper end opening 3b and is rotatable about the valve shaft 15.
A manual lever 20 that moves the valve shaft 15 up and down is pivotally attached by a split pin 21 to a protruding end 15e of the valve shaft 15 protruding above the lid body 19.
[0009]
The manual lever 20 is formed in a substantially U-shaped cross section having a predetermined length, and has a predetermined gap between the upper surface 20b of the base end portion 20a and the protruding end 15e in the lying state shown in FIG. Further, when the protrusion 15e is arranged between the left and right side walls 20c of the base end portion 20a and the split pin 21 serving as a support shaft is inserted and the manual lever 20 is raised and operated, the base end portion 20a upper surface 20b is The distance between the end face 20d of the base end portion 20a and the support shaft 21 is set longer than the distance between the lid 19 and the support shaft 21 so as not to contact the protruding end 15e. With the manual lever 20 raised so that the end surface 20d is in contact with the top surface of the lid 19, the position of the support shaft 21 is displaced upward than when the manual lever is tilted to lift and hold the valve shaft 15, and the valve shaft The flange 16a of the spring receiver 16 attached to 15 engages the protruding piece 14 of the diaphragm receiver 12 so that the valve body 10 is separated from the valve port 8 together with the diaphragm 9. It is made to let it go.
Further, in the manual lever 20, a portion 20e where the end surface 20d of the base end portion 20a and the lower end of the left and right side walls 20c intersect is formed in an arc shape, and this arc portion 20e slides on the upper surface of the lid 19 when the manual lever 20 is rotated. It is made to touch.
[0010]
The screwdriver S is provided with a hexagonal columnar tip support portion via a shaft portion protruding in the axial direction from the handle portion, and a pair of tip portions S1 having a predetermined length is provided in parallel from the tip support portion. The tip portion S1 is formed in a round bar shape corresponding to the width of the recess portion 18c, and the guide hole 19b is provided through the lid body 19 as described above so as to correspond to the interval and cross-sectional shape of the tip portion S1. .
[0011]
Next, the operation of the relief valve 1 will be described.
After assembly of the relief valve 1 having the above configuration, if the final pressure does not satisfy the set pressure, the relief valve 1 is connected to the set pressure test device for readjustment of the elastic force of the adjustment spring 17. .
Then, the lid body 19 is rotated so that the guide hole 19b of the lid body 19 is collinear with the recess 18c of the adjusting screw 18. After such positioning, the tip of the tip S1 of the screwdriver S passes through the guide hole 19b. By inserting into the recess 18c and rotating the screwdriver S in an appropriate direction, the adjusting screw 18 is moved up or down to adjust the elastic force of the adjusting spring 17 so as to satisfy the set pressure (FIGS. 4 to 6). reference).
When the screwdriver S is rotated, the lid 19 is rotated in the same manner, and the manual lever 20 is also rotated with the valve shaft 15 in the same direction because the tip S1 projecting upward from the lid 19 is in contact with the side wall 20c. Will be.
[0012]
The operation of the relief valve 1 attached to the hot water device will be described.
When the pressure in the primary flow path 6 of the relief valve 1 rises and reaches the pressure set by the adjustment spring 17, the diaphragm 9 is pressed in the valve opening direction against the elastic force of the adjustment spring 17, and the valve body When the valve 10 opens away from the valve port 8 and the fluid flows from the primary side flow path 6 to the secondary side flow path 7 and then the primary pressure drops below the set pressure, the diaphragm 9 is closed by the adjustment spring 17. Displaces in the valve direction and closes.
When confirming the operation of the relief valve 1, the manually operated manual lever 20 is normally turned to stand on the lid 19, and the valve shaft 15 is lifted and held against the elastic force of the adjustment spring 17. The spring receiver 16 that moves upward together with the valve shaft 15 engages with the projecting piece 14 to force the valve body 10 away from the valve port 8 and forcibly opens the valve. After confirming the operation, the manual lever 20 is returned to the lying down state. Close the valve.
[0013]
【The invention's effect】
In short, according to the present invention, in the relief valve 1 having the above-described configuration, the guide hole 19b for screwing S is penetrated through the lid 19 corresponding to the recess 18c for screwing S provided on the upper surface of the adjusting screw 18. After the relief valve 1 is assembled, if the set pressure is not satisfied in the final test, the tip S1 of the screwdriver S is inserted into the recess 18c of the adjusting screw 18 through the guide hole 19b of the lid 19. As in the prior art, the adjusting screw 18 can be rotated up and down with the screwdriver S without removing the split pin 21, the manual lever 20 and the lid 19, and the elasticity of the adjusting spring 17 with respect to the diaphragm valve 11 can be The force can be adjusted easily.
Therefore, according to the present invention, the working efficiency at the time of assembling can be remarkably improved. As a result, the relief valve 1 can be provided at a low cost and the practical effect is significant.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a relief valve.
FIG. 2 is a longitudinal sectional view of a relief valve when operation is confirmed.
3 is a plan view of FIG. 1. FIG.
FIG. 4 is a longitudinal sectional view of a relief valve showing a state where a tip of a screwdriver is inserted into a recess of an adjustment screw.
5 is a partially broken right side view of FIG. 4. FIG.
6 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Relief valve 2 Valve box 3 Spring cover 3b Upper end opening part 6 Primary side flow path 7 Secondary side flow path 8 Valve port
11 Diaphragm valve
15 Valve stem
15e Tip
17 Adjusting spring
18 Adjustment screw
18c recess
19 Lid
19b Guide hole
20 Manual lever S Screwdriver

Claims (1)

弁箱内の一次側流路と二次側流路とが連通する弁口を開閉するダイヤフラム弁に係脱自在な弁軸を、ダイヤフラム弁を閉弁方向へ付勢する調節バネを押圧する様にバネカバー内に上下動自在に螺着した調節ネジと、該調節ネジの上方でバネカバーの上端開口部に回転自在に被冠する蓋体との夫々に挿通すると共に、該蓋体の上方に突出した弁軸の突端に手動レバーを枢着した逃し弁において、調節ネジの上面に設けたネジ回し用の凹部に対応して蓋体にネジ回し用の案内孔を貫設したことを特徴とする逃し弁。The valve shaft that can be engaged with and disengaged from the diaphragm valve that opens and closes the valve port communicating with the primary side flow path and the secondary side flow path in the valve box is pressed against the adjustment spring that biases the diaphragm valve in the valve closing direction Are inserted into an adjustment screw screwed up and down in the spring cover and a lid that is rotatably covered by the upper end opening of the spring cover above the adjustment screw, and protrudes above the lid body. In the relief valve in which a manual lever is pivotally attached to the protruding end of the valve shaft, a screw-turning guide hole is provided through the lid corresponding to the screw-turn recess provided on the upper surface of the adjustment screw. A relief valve.
JP2001341750A 2001-11-07 2001-11-07 Relief valve Expired - Lifetime JP3974380B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001341750A JP3974380B2 (en) 2001-11-07 2001-11-07 Relief valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001341750A JP3974380B2 (en) 2001-11-07 2001-11-07 Relief valve

Publications (2)

Publication Number Publication Date
JP2003148640A JP2003148640A (en) 2003-05-21
JP3974380B2 true JP3974380B2 (en) 2007-09-12

Family

ID=19155725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001341750A Expired - Lifetime JP3974380B2 (en) 2001-11-07 2001-11-07 Relief valve

Country Status (1)

Country Link
JP (1) JP3974380B2 (en)

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