JP5539282B2 - Relief valve - Google Patents

Relief valve Download PDF

Info

Publication number
JP5539282B2
JP5539282B2 JP2011207945A JP2011207945A JP5539282B2 JP 5539282 B2 JP5539282 B2 JP 5539282B2 JP 2011207945 A JP2011207945 A JP 2011207945A JP 2011207945 A JP2011207945 A JP 2011207945A JP 5539282 B2 JP5539282 B2 JP 5539282B2
Authority
JP
Japan
Prior art keywords
valve
pressure
valve body
receiving surface
box
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.)
Active
Application number
JP2011207945A
Other languages
Japanese (ja)
Other versions
JP2013068287A (en
Inventor
太 新倉
Original Assignee
新倉工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 新倉工業株式会社 filed Critical 新倉工業株式会社
Priority to JP2011207945A priority Critical patent/JP5539282B2/en
Priority to CN201210301139.0A priority patent/CN103016802B/en
Priority to TW101134390A priority patent/TWI461620B/en
Priority to KR1020120104840A priority patent/KR101410622B1/en
Publication of JP2013068287A publication Critical patent/JP2013068287A/en
Application granted granted Critical
Publication of JP5539282B2 publication Critical patent/JP5539282B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Description

本発明は、タンク等の密閉容器に用いられて、この密閉容器内の圧力が設定値に達した際に、密閉容器内の気体を外部へ放出して密閉容器の健全性を確保するようにしたリリーフ弁に関するものである。   The present invention is used for a closed container such as a tank, and when the pressure in the closed container reaches a set value, the gas in the closed container is released to the outside so as to ensure the soundness of the closed container. Relates to the relief valve.

前述した密閉容器にあっては、気温の変化や内部の蒸気圧の変化等によってその内部圧力が上昇し、設定圧力以上に達することがある。   In the above-described sealed container, the internal pressure may increase due to a change in temperature, a change in internal vapor pressure, or the like, and may reach a set pressure or higher.

例えば、ケミカルタンカーやオイルタンカー等に設備されている密閉容器としてのタンクにあっては、積載物の積み込みよってタンク内の気体が圧縮されて内部圧力が上昇することがある。また、安全上の理由により、積載物が積み込まれた余剰空間部に不活性ガス等を充填している。この場合には、気温により不活性ガスが膨張し内部圧力の上昇をきたすことがある。   For example, in a tank as an airtight container installed in a chemical tanker, an oil tanker, or the like, the gas in the tank may be compressed due to the loading of the load, and the internal pressure may increase. For safety reasons, the surplus space where the load is loaded is filled with an inert gas or the like. In this case, the inert gas may expand due to the temperature, and the internal pressure may increase.

このような圧力上昇を抑制するために、密閉容器にリリーフ弁を設けて、内部圧力が設定圧力に至った際に、密閉容器内の気体を外部へ放出して内部圧力を設定圧力以内に保持することが行われている。   In order to suppress such pressure rise, a relief valve is provided in the sealed container, and when the internal pressure reaches the set pressure, the gas in the sealed container is released to the outside and the internal pressure is kept within the set pressure. To be done.

例えば、ケミカルタンカー等に設備されるリリーフ弁においては、開弁から閉弁までの間、常に排気速度を３０ｍ／ｓｅｃ以上の高速で上方へ排気することにより、タンクへの火災の侵入を防止する安全策が採られている。
排気速度を３０ｍ／ｓｅｃ以上の高速にするためには、弁体の開弁速度を速くする必要がある。このタンク内圧を利用して弁体の開弁速度を速くする方法として、弁体に設定圧力で開弁させる第１受圧面と、それよりも大きい面積を有する第２受圧面とを設け、タンク内圧を第１受圧面から第２受圧面に作用させることで、開弁速度を速くする方法がある。この方法では、弁体を持ち上げる力が第１受圧面と第２受圧面との面積比分上昇するため、この面積比を大きくすることで、開弁速度をより速くすることが可能である。 For example, in a relief valve installed in a chemical tanker or the like, the intrusion of a fire into the tank is prevented by always exhausting upward at a high speed of 30 m / sec or more from the opening to the closing of the valve. Safety measures are taken.
In order to increase the exhaust speed to 30 m / sec or higher, it is necessary to increase the valve opening speed of the valve element. As a method of increasing the valve opening speed of the valve body by using this tank internal pressure, a first pressure receiving surface for opening the valve body at a set pressure and a second pressure receiving surface having a larger area are provided. There is a method of increasing the valve opening speed by applying an internal pressure from the first pressure receiving surface to the second pressure receiving surface. In this method, the force to lift the valve body increases by the area ratio between the first pressure receiving surface and the second pressure receiving surface, so that the valve opening speed can be increased by increasing this area ratio.

しかし、この方法では、逆に、開弁させる際に必要な設定圧力よりも十分に低い圧力にならないと閉弁しないために、それだけ多くの不活性ガスを放出してしまうことになる。これは、開弁速度を速くするための第２受圧面の機能が、閉弁動作においては逆に作用するからである。   However, in this method, conversely, since the valve is not closed unless the pressure is sufficiently lower than the set pressure required for opening the valve, so much inert gas is released. This is because the function of the second pressure receiving surface for increasing the valve opening speed acts reversely in the valve closing operation.

この点、特許文献１に記載の技術は、内部気体の放出時における放出気体の圧力変化に起因したリリーフ弁の開閉動作の繰り返し現象を防止することを目的としたものであるが、閉弁時に弁体を下方へ引き寄せる磁石を設けることで、閉弁速度を速くし、圧力が設定圧力以下に降下した際の早期の密閉動作が行えるようにしている。   In this regard, the technique described in Patent Document 1 is intended to prevent the repetitive phenomenon of the opening and closing operation of the relief valve due to the pressure change of the released gas when the internal gas is released. By providing a magnet that pulls the valve body downward, the valve closing speed is increased so that an early sealing operation can be performed when the pressure drops below the set pressure.

特許第４２８２３２６号公報Japanese Patent No. 4282326

しかしながら、このように弁体を下方へ引き寄せる磁石を設ける方法では、次のような点で解決すべき課題があった。
（１）高価な部品となる磁石を用いた分だけ製造コストが高くなる点。
（２）磁石だけでなく磁石の取付手段等の部品点数も増加する点。
（３）リリーフ弁はタンカー等に装備されることが多いため、腐食性ガスによって磁石が腐食する点。
（４）磁石は鉄分を引き付けるため、磁石の存在する弁箱内に鉄分が付着しやすい点。
また、この特許文献１に記載の圧力弁では、開弁動作の応答性についても改善の余地が残されている。
このように、従来においては開弁動作の応答性と閉弁動作の応答性とを両立させることは難しかった。
以上の理由から、開弁時における気体の放出動作及び閉弁時における密閉動作のいずれにおいてもその応答性を高めることができる新規な解決策が望まれていた。 However, such a method of providing a magnet that draws the valve body downward has problems to be solved in the following points.
(1) The manufacturing cost is increased by the amount of magnets that are expensive parts.
(2) The number of parts such as not only magnets but also magnet mounting means increases.
(3) Since the relief valve is often installed in a tanker or the like, the magnet is corroded by corrosive gas.
(4) Since the magnet attracts iron, iron easily adheres to the valve box where the magnet exists.
In the pressure valve described in Patent Document 1, there is still room for improvement in the responsiveness of the valve opening operation.
Thus, conventionally, it has been difficult to achieve both the responsiveness of the valve opening operation and the responsiveness of the valve closing operation.
For these reasons, there has been a demand for a novel solution that can enhance the responsiveness in both the gas release operation during valve opening and the sealing operation during valve closing.

本発明は、前述した従来の問題点に鑑みてなされたもので、密閉容器内の圧力が設定値を超えた際の気体の放出動作、および、圧力が設定値を下回った際の密閉動作の応答性を向上させることができる新規な技術を提供することを課題とする。   The present invention has been made in view of the above-described conventional problems, and includes a gas releasing operation when the pressure in the sealed container exceeds a set value, and a sealing operation when the pressure falls below the set value. It is an object of the present invention to provide a novel technique that can improve responsiveness.

本発明のリリーフ弁は、前述した課題を解決するために、弁体と、この弁体が付勢されて気密に当接させられる弁座が形成された弁箱とを備え、弁箱に導かれる気体の圧力が設定値に至った際に、その圧力により前記弁体が前記弁座から離間させられて前記弁箱内の気体を外部へ放出するようにしたリリーフ弁であって、前記弁体に、この弁体と一体に設けられ前記弁箱の内壁との間に前記気体の流路を形成する可動体が設けられているとともに、前記弁体には、前記弁箱内の圧力が常時作用する第１の受圧面と、弁体が前記弁座から離間させられた際に前記弁箱内の圧力が作用する第２の受圧面とが形成され、前記可動体には、前記弁箱内の圧力を受ける第３の受圧面が形成され、前記弁箱の内壁には、前記弁体が前記弁座から離間させられた際に、前記可動体と協働して前記流路を狭める小径部が形成されていることを特徴とするものである。 - relief valve of the present invention, in order to solve the aforementioned problems, a valve body, the valve body is energized and a valve body a valve seat which is brought into contact is formed hermetically, the valve box When the pressure of the introduced gas reaches a set value, the relief valve is configured to release the gas in the valve box to the outside by separating the valve body from the valve seat by the pressure, The valve body is provided with a movable body that is provided integrally with the valve body and that forms the gas flow path between the valve body and the inner wall of the valve box. Is formed, and a second pressure receiving surface on which the pressure in the valve box acts when the valve body is separated from the valve seat is formed on the movable body. A third pressure receiving surface for receiving the pressure in the valve box is formed, and the valve body is separated from the valve seat on the inner wall of the valve box. When the, is characterized in that the small diameter portion narrowing the flow path in cooperation with said movable member is formed.

このような構成とすることにより、弁箱内の圧力が所定圧力に達すると、弁体に形成されている第１の受圧面に作用する力によって、弁体および可動体が開弁方向へ移動させられる。   With such a configuration, when the pressure in the valve box reaches a predetermined pressure, the valve body and the movable body move in the valve opening direction by the force acting on the first pressure receiving surface formed on the valve body. Be made.

開弁動作の初期において、弁体が弁座より離間した際に、この弁体に形成されている第２の受圧面が弁箱へ連通させられるとともに、この第２の受圧面に弁箱内の圧力が作用し、この第２の受圧面に作用する力が前記弁体に加わることにより、弁体の開弁動作が加速される。   In the initial stage of the valve opening operation, when the valve body is separated from the valve seat, the second pressure receiving surface formed on the valve body is communicated with the valve box, and the second pressure receiving surface is connected to the inside of the valve box. And the force acting on the second pressure receiving surface is applied to the valve body, so that the valve opening operation of the valve body is accelerated.

弁体が閉弁位置にある状態において、弁箱内部の、可動体を取り巻く気体圧力は一定であり、したがって、可動体に弁の開閉方向への力は作用していない。   In the state in which the valve body is in the valve closing position, the gas pressure surrounding the movable body inside the valve box is constant, and therefore no force in the opening / closing direction of the valve acts on the movable body.

前記第１の受圧面および第２の受圧面に作用する力による開弁動作が進むと、可動体の弁体側（すなわち、流路の下流側）の圧力が低下し、この可動体の流路の上流側にこの可動体を開弁方向へ移動させる力が新たに加わる。
これによって、弁体の開弁動作が加速される。 When the valve opening operation by the force acting on the first pressure receiving surface and the second pressure receiving surface proceeds, the pressure on the valve body side of the movable body (that is, the downstream side of the flow path) decreases, and the flow path of the movable body A force for moving the movable body in the valve opening direction is newly added to the upstream side of the valve.
Thereby, the valve opening operation of the valve body is accelerated.

さらに開弁動作が進むと、可動体が弁箱の小径部に移動して弁箱内の流路が狭められ、これによって、可動体の上流側の気体圧力が上昇するとともに、この可動体に作用する開弁方向の力がさらに増加し、弁体の開弁動作が一層加速される。   When the valve opening operation further proceeds, the movable body moves to the small diameter portion of the valve box and the flow path in the valve box is narrowed, thereby increasing the gas pressure on the upstream side of the movable body. The acting force in the valve opening direction is further increased, and the valve opening operation of the valve body is further accelerated.

このように、第１の受圧面へ作用する力に第２の受圧面へ作用する力が加わり、さらに、可動体へ作用する力が加わった後に、この力が圧力上昇に伴って増幅されることにより、弁体の開弁動作が迅速に行われる。   Thus, after the force acting on the second pressure receiving surface is added to the force acting on the first pressure receiving surface, and further the force acting on the movable body is added, this force is amplified as the pressure increases. Thus, the valve opening operation of the valve body is performed quickly.

一方、閉弁動作は、前述した開弁動作と逆の動作で行われるが、第２の受圧面に圧力が有効に作用するまえに、可動体が弁箱の小径部から離れ大径部に位置させられる。   On the other hand, the valve closing operation is performed in reverse to the valve opening operation described above, but before the pressure acts effectively on the second pressure receiving surface, the movable body moves away from the small diameter portion of the valve box and moves to the large diameter portion. Be positioned.

このときに、可動体の上流側の気体圧力が低下し、これによって、可動体に加わる開弁方向への力が減少する。
このとき、弁体は閉弁方向へ移動していることから、その慣性力と前述した可動体へ作用している開弁方向への力の減少とにより、弁体が弁座に当接させられてリリーフ弁が閉じられる。
したがって、弁体が迅速に閉じられる。 At this time, the gas pressure on the upstream side of the movable body decreases, and thereby the force in the valve opening direction applied to the movable body decreases.
At this time, since the valve body is moving in the valve closing direction, the valve body is brought into contact with the valve seat by the inertia force and the decrease in the force in the valve opening direction acting on the movable body described above. And the relief valve is closed.
Therefore, the valve body is quickly closed.

そして、この可動体へ作用している開弁方向への力の減少量は、弁箱の小径部と大径部との内径差を設計変更することにより調整が可能であり、この減少量を、閉弁動作時に第２の受圧面に生じる開弁方向への力よりも大きく設定しておくとより閉弁動作が加速される。   The amount of decrease in the force in the valve opening direction acting on the movable body can be adjusted by changing the design of the inner diameter difference between the small diameter portion and the large diameter portion of the valve box. If the force is set larger than the force in the valve opening direction generated on the second pressure receiving surface during the valve closing operation, the valve closing operation is further accelerated.

また、前述した可動体へ作用している開弁方向への力の減少量の調整は、閉弁時の圧力の調整を行うことでもあり、これによって、開弁時の設定圧力に対する閉弁時の圧力を設定することが可能となる。   In addition, the adjustment of the amount of decrease in the force in the valve opening direction acting on the movable body described above is also the adjustment of the pressure at the time of valve closing. It is possible to set the pressure.

したがって、閉弁時の圧力を開弁時の設定圧力に極力近づけることが可能となり、過度の気体放出を抑制してリリーフ弁が設置されている密閉容器内の過度の圧力低下を抑制することができる。
ちなみに、閉弁時の圧力は、開弁時の設定圧力７０％〜８０％程度が好適であると考えられる。 Therefore, it is possible to bring the pressure at the time of closing the valve as close as possible to the set pressure at the time of opening the valve, and it is possible to suppress excessive gas discharge and suppress excessive pressure drop in the sealed container in which the relief valve is installed. it can.
Incidentally, it is considered that the pressure when the valve is closed is preferably about 70% to 80% of the set pressure when the valve is opened.

このように、過度の気体の放出が抑制されると、たとえば、安全上充填される不活性ガス等の放出量を少なくして、管理コストを軽減することが期待できる。   Thus, if excessive gas release is suppressed, it can be expected that, for example, the release amount of an inert gas or the like to be filled for safety is reduced to reduce the management cost.

本発明の好ましい形態のリリーフ弁は、前記受圧面が、前記第１の受圧面よりも大きい面積であることを特徴とするものである。
このような構成とすることにより、弁体の開弁動作をより迅速にすることができる。 A preferred form of the relief valve of the present invention, the pressure receiving surface is further characterized in that said first an area larger than the pressure receiving surface.
By setting it as such a structure, the valve opening operation | movement of a valve body can be made quicker.

本発明の好ましい形態のリリーフ弁は、前記可動体が、大径部と小径部とを有し、前記弁体が前記弁座から離間させられた際に、前記可動体の大径部と前記弁箱の小径部との間で前記流路を狭めることを特徴とするものである。
このような構成とした場合、簡易な構造によって、可動体の大径部に弁体のような機能
を、弁箱の小径部に弁座のような機能を付与することができる。 A preferred form of the relief valve of the present invention, the movable body, and a large diameter portion and a small diameter portion, when the valve body has been moved away from the valve seat, wherein a large diameter portion of said movable member The flow path is narrowed between the small diameter portion of the valve box.
In such a configuration, a function like a valve body can be given to the large diameter portion of the movable body and a function like a valve seat can be given to the small diameter portion of the valve box with a simple structure.

本発明の好ましい形態のリリーフ弁として、前記弁箱には、前記弁体が気密状態で摺動可能に嵌合させられるガイド部が前記第２の受圧面を取り囲むように形成されていることを特徴とするものである。 Preferred embodiments of the relief valve of the present invention, the valve box, that the guide portion into which the valve body is brought slidably fitted in an airtight state is formed to surround the second pressure receiving surface It is a feature.

このような構成とすることにより、第２の受圧面から排気される気体の量を前記ガイド部によって抑制することにより、第２の受圧面に作用する力を確実に得ることができる。   By setting it as such a structure, the force which acts on a 2nd pressure receiving surface can be obtained reliably by suppressing the quantity of the gas exhausted from a 2nd pressure receiving surface by the said guide part.

本発明の好ましい形態のリリーフ弁として、前記弁体および可動体が、鉛直方向に移動可能に設けられ、これらの質量により前記弁体が前記弁座へ向けて付勢されていることを特徴とするものである。
 Preferred embodiments of the relief valve of the present invention, the valve body and the movable body is movable in the vertical direction, and wherein the valve body is biased toward the valve seat by their mass To do.

このような構成とすることにより、弁体の質量と可動体の質量との合計質量に対してのみ、開弁動作ならびに閉弁動作のための諸条件の設定、各種受圧面の面積、可動体の寸法や小径部の寸法等の設定を行うものであるから、設定が簡便で容易である。   By adopting such a configuration, only for the total mass of the mass of the valve body and the mass of the movable body, various conditions for the valve opening operation and the valve closing operation are set, the areas of the various pressure receiving surfaces, the movable body Therefore, the setting is simple and easy.

本発明によれば、密閉容器内の圧力が設定値を超えた際の気体の放出動作、および、圧力が設定値を下回った際の密閉動作の応答性を向上させることができる。   According to the present invention, it is possible to improve the responsiveness of the gas release operation when the pressure in the sealed container exceeds the set value and the seal operation when the pressure falls below the set value.

本発明の一実施形態を示す縦断面である。It is a longitudinal section showing one embodiment of the present invention. 本発明の一実施形態の動作を説明するための縦断面である。It is a longitudinal section for explaining operation of one embodiment of the present invention. 本発明の一実施形態を示す要部の拡大縦断面図である。It is an expanded longitudinal cross-sectional view of the principal part which shows one Embodiment of this invention. 本発明の可動体の他の実施形態を示す正面図である。It is a front view which shows other embodiment of the movable body of this invention.

以下、本発明の一実施形態を図１ないし図３を参照して説明する。
図１中、符号１は、本実施形態に係わるリリーフ弁を示している。該リリーフ弁は、弁体２と、図示しない密閉容器に取り付けられて、その内部と連通させられる気体導入口３ａ、および密閉容器内の気体を外部へ放出する気体排出口３ｂを有する弁箱３とを備えている。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
In FIG. 1, the code | symbol 1 has shown the relief valve concerning this embodiment. The relief valve is a valve box 3 having a valve body 2, a gas inlet 3 a that is attached to a sealed container (not shown) and communicates with the inside thereof, and a gas outlet 3 b that discharges the gas in the sealed container to the outside. And.

前記弁体２には、前記弁箱３の内壁との間に気体の流路Ｌを形成する可動体４が同軸上に設けられている。前記弁体２には、前記弁箱３内の圧力が常時作用する第１の受圧面２ａと、弁体２が前記弁箱３の気体排出口３ｂの内面に形成された略円錐台形状の弁座３ｃから離間させられた際に前記弁箱３内の圧力が作用する第２の受圧面２ｂとが形成されている。前記可動体４には、前記第１の受圧面２ａよりも大きな第３の受圧面４ａが形成されている。前記弁箱３の内壁には、前記弁体２が前記弁座３ｃから離間させられた際に、前記可動体４と協働して前記流路Ｌを狭める小径部３ｄが形成され、この小径部３ｄの上流側が大径部３ｅとなされている。３ｆは吸気弁の取り付け部である。   A movable body 4 that forms a gas flow path L between the valve body 2 and the inner wall of the valve box 3 is coaxially provided. The valve body 2 has a substantially frustoconical shape in which the first pressure receiving surface 2a on which the pressure in the valve box 3 always acts and the valve body 2 are formed on the inner surface of the gas outlet 3b of the valve box 3 are formed. A second pressure receiving surface 2b is formed on which the pressure in the valve box 3 acts when separated from the valve seat 3c. The movable body 4 is formed with a third pressure receiving surface 4a larger than the first pressure receiving surface 2a. When the valve body 2 is separated from the valve seat 3c, a small-diameter portion 3d that narrows the flow path L in cooperation with the movable body 4 is formed on the inner wall of the valve box 3. The upstream side of the portion 3d is a large diameter portion 3e. Reference numeral 3f denotes an intake valve mounting portion.

前記弁体２および可動体４は、前記弁箱３の中心部に一方向（本実施形態においては上下方向）に往復動可能に装着されたロッド５の上端部および略中間部に一体に取り付けられている。
すなわち、前記可動体４は、前記ロッド５に被嵌されているとともに、前記ロッド５にピン６を介して軸方向の移動が拘束された状態で取り付けられたストッパー７と、このストッパー７と所定間隔をおいて螺着されたナット８とによって前記ロッド５に固定されている。 The valve body 2 and the movable body 4 are integrally attached to an upper end portion and a substantially intermediate portion of a rod 5 which is mounted on a central portion of the valve box 3 so as to be able to reciprocate in one direction (vertical direction in the present embodiment). It has been.
That is, the movable body 4 is fitted on the rod 5 and is attached to the rod 5 with the pin 6 being restricted from moving in the axial direction. It is fixed to the rod 5 by nuts 8 screwed at intervals.

前記弁体２は、前記ロッド５に被嵌されているとともに、このロッド５の上端部近傍に形成された段部（図示略）と、前記ロッド５の端部に螺着されたナット９とによって挟持されて固定されている。
また、この弁体２に形成されている前記第２の受圧面２ｂは、前記弁座３ｃの内面形状とほぼ同一の外面形状に形成され、この弁座３ｃに気密に当接させられるようになっている。 The valve body 2 is fitted on the rod 5, a step portion (not shown) formed in the vicinity of the upper end portion of the rod 5, and a nut 9 screwed onto the end portion of the rod 5, It is clamped and fixed by.
Further, the second pressure receiving surface 2b formed on the valve body 2 is formed in an outer surface shape substantially the same as the inner surface shape of the valve seat 3c, and is brought into airtight contact with the valve seat 3c. It has become.

前記弁箱３は、円筒状で略中間部にステー１０ａが形成された本体１０と、この本体１０の上端部に着脱可能に装着された蓋体１１とによって構成されている。   The valve box 3 is constituted by a main body 10 having a cylindrical shape and a stay 10a formed at a substantially intermediate portion, and a lid 11 detachably attached to an upper end portion of the main body 10.

前記ステー１０ａの中央には、前記ロッド５が摺動自在に嵌合させられるガイドブッシュ１２が一体に取り付けられている。また、前記蓋体１１の上端部内面には前記弁座３ｃが形成されているとともに、上下方向略中間部には、前記ロッド５が摺動自在に嵌合されるガイド１３が複数のステー１４を介して一体に設けられている。   A guide bush 12 to which the rod 5 is slidably fitted is integrally attached to the center of the stay 10a. Further, the valve seat 3c is formed on the inner surface of the upper end portion of the lid body 11, and a guide 13 into which the rod 5 is slidably fitted is provided at a plurality of stays 14 at a substantially intermediate portion in the vertical direction. It is provided integrally through.

このように構成された本実施形態に係わるリリーフ弁１は、図１に示すように、弁体２の第２の受圧面２ｂが蓋体１１の弁座３ｃに全周にわたって気密に当接させられることにより、閉弁状態となされる。
本実施形態においては、前記弁体２や可動体４およびこれらを連結するロッド５やストッパー７、ピン６、ナット８，および、ナット９等の質量によって前記弁体２と弁座３ｃとの当接がなされている。 As shown in FIG. 1, the relief valve 1 according to the present embodiment configured as described above causes the second pressure receiving surface 2 b of the valve body 2 to abut against the valve seat 3 c of the lid body 11 in an airtight manner over the entire circumference. As a result, the valve is closed.
In the present embodiment, the valve body 2 and the movable body 4 and the contact between the valve body 2 and the valve seat 3c are determined by the mass of the rod 5, the stopper 7, the pin 6, the nut 8, the nut 9, and the like that connect them. Contact is made.

タンカーのタンク等の図示しない密閉容器に接続されて使用されるリリーフ弁１は、その内部の圧力が前記密閉容器内の圧力と均衡しており、その圧力が、弁体２の第１の受圧面２ａに作用し、開弁方向への力が作用している。
そして、前記可動体４は、前記弁体２が閉弁位置に位置させられているから、その全周にわたって均一な圧力が作用していることから、気体による力は作用していない。 The relief valve 1 used by being connected to a closed container (not shown) such as a tanker tank has an internal pressure balanced with the pressure in the closed container, and the pressure is the first pressure receiving pressure of the valve body 2. Acting on the surface 2a, a force in the valve opening direction is acting.
And since the said valve body 2 is located in the valve closing position in the said movable body 4, since the uniform pressure is acting over the perimeter, the force by gas does not act.

密閉容器内の圧力が上昇すると、弁箱３内の圧力も上昇し、第１の受圧面２ａに作用する開弁方向への力が増加し、設定圧力以上になった時点で弁体２が開方向へ移動させられる。   When the pressure in the sealed container rises, the pressure in the valve box 3 also rises, the force in the valve opening direction acting on the first pressure receiving surface 2a increases, and when the pressure becomes 2 or higher, the valve body 2 It is moved in the opening direction.

弁体２の開方向への移動に伴い、第２の受圧面２ｂが弁座３ｃより離間し、この第２の受圧面２ｂに圧力が加わり開弁方向への力が生じ、前記第１の受圧面２ａに加わる力とともに弁体２を開弁方向へ移動させる。   As the valve body 2 moves in the opening direction, the second pressure receiving surface 2b moves away from the valve seat 3c, and pressure is applied to the second pressure receiving surface 2b to generate a force in the valve opening direction. The valve body 2 is moved in the valve opening direction together with the force applied to the pressure receiving surface 2a.

さらに弁体２の開弁動作が継続すると、図２に示すように、弁箱３が大きく開放されて、可動体４の弁座３ｃ側の圧力が低下する。
これによって、可動体４の流路Ｌの上流側と下流側とに圧力差が生じ、この圧力差によって、前記可動体４が、弁座３方向へ移動させられる。 Further, when the valve opening operation of the valve body 2 continues, as shown in FIG. 2, the valve box 3 is largely opened, and the pressure on the valve seat 3c side of the movable body 4 is reduced.
As a result, a pressure difference is generated between the upstream side and the downstream side of the flow path L of the movable body 4, and the movable body 4 is moved in the direction of the valve seat 3 by this pressure difference.

また、可動体４の移動により、この可動体４が弁箱３の小径部３ｄへ移動し流路Ｌを狭め、前記可動体４の上流側の圧力が上昇し、この可動体４の開弁方向への押圧力が高められる。   Further, due to the movement of the movable body 4, the movable body 4 moves to the small diameter portion 3 d of the valve box 3 to narrow the flow path L, the pressure on the upstream side of the movable body 4 increases, and the valve opening of the movable body 4 is performed. The pressing force in the direction is increased.

このように、複数の押圧力が合わさって開弁方向に作用することなり、開弁速度が著しく向上する。   Thus, a plurality of pressing forces are combined to act in the valve opening direction, and the valve opening speed is significantly improved.

前記密閉容器内の圧力が設定圧力より低くなると閉弁動作が開始されるが、この閉弁動作時において、弁体２を開方向に移動させようとする力が、可動体４の大径部３ｅへの移動によって急激に減少する。
したがって、弁体２は閉弁位置に向かって急速に移動し、その慣性力と相まって、迅速な閉弁が行われる。 When the pressure in the closed container becomes lower than the set pressure, the valve closing operation is started. During this valve closing operation, the force for moving the valve body 2 in the opening direction is the large diameter portion of the movable body 4. It decreases rapidly by moving to 3e.
Therefore, the valve body 2 moves rapidly toward the valve closing position, and quick valve closing is performed in combination with the inertia force.

なお、前記実施形態において示した各構成部材の諸形状や寸法等は一例であって、設計要求等に基づき種々変更可能である。   Note that the shapes, dimensions, and the like of the constituent members shown in the above embodiment are merely examples, and various changes can be made based on design requirements and the like.

たとえば、図３に示すように、前記弁箱３に、前記弁体２が気密状態で摺動可能に嵌合させられるガイド部１５を、前記第２の受圧面２ｂを取り囲むように形成して、第２の受圧面２ｂへの圧力の作用を高めることができる。   For example, as shown in FIG. 3, a guide portion 15 is formed in the valve box 3 so that the valve body 2 is slidably fitted in an airtight state so as to surround the second pressure receiving surface 2b. The action of pressure on the second pressure receiving surface 2b can be enhanced.

また、前記実施形態の可動体４は、肉厚の円筒部材を切削加工して小径部分と大径部分とを形成した例を示しているが、この可動体４としては、図４に示すように、筒状の本体部４１と、その上端部に固定した孔あき円板４２とにより構成しても良い。
このように構成した場合、可動体４自体の制作性が容易で、より低コスト化を図ることができる。 Moreover, although the movable body 4 of the said embodiment has shown the example which cut the thick cylindrical member and formed the small diameter part and the large diameter part, as this movable body 4 is shown in FIG. Alternatively, it may be constituted by a cylindrical main body portion 41 and a perforated disk 42 fixed to the upper end portion thereof.
When configured in this manner, the productivity of the movable body 4 itself is easy, and the cost can be further reduced.

１ リリーフ弁
２ 弁体
２ａ 第１の受圧面
２ｂ 第２の受圧面
３ 弁箱
３ａ 気体導入口
３ｂ 気体排出口
３ｃ 弁座
３ｄ 小径部
３ｅ 大径部
４ 可動体
５ ロッド
６ ピン
７ ストッパー
８ ナット
９ ナット
１０ 本体
１０ａ ステー
１１ 蓋体
１２ ガイドブッシュ
１３ ガイド
１４ ステー
１５ ガイド部 DESCRIPTION OF SYMBOLS 1 Relief valve 2 Valve body 2a 1st pressure receiving surface 2b 2nd pressure receiving surface 3 Valve box 3a Gas inlet 3b Gas outlet 3c Valve seat 3d Small diameter part 3e Large diameter part 4 Movable body 5 Rod 6 Pin 7 Stopper 8 Nut 9 Nut 10 Body 10a Stay 11 Lid 12 Guide bush 13 Guide 14 Stay 15 Guide part

Claims (5)

弁体と、この弁体が付勢されて気密に当接させられる弁座が形成された弁箱とを備え、弁箱に導かれる気体の圧力が設定値に至った際に、その圧力により前記弁体が前記弁座から離間させられて前記弁箱内の気体を外部へ放出するようにしたリリーフ弁であって、
前記弁体に、この弁体と一体に設けられ前記弁箱の内壁との間に前記気体の流路を形成する可動体が設けられているとともに、
前記弁体には、前記弁箱内の圧力が常時作用する第１の受圧面と、弁体が前記弁座から離間させられた際に前記弁箱内の圧力が作用する第２の受圧面とが形成され、
前記可動体には、前記弁箱内の圧力を受ける第３の受圧面が形成され、
前記弁箱の内壁には、前記弁体が前記弁座から離間させられた際に、前記可動体と協働して前記流路を狭める小径部が形成され、
前記弁箱には、前記弁体が気密状態で摺動可能に嵌合させられるガイド部が前記第２の受圧面を取り囲むように形成され、
前記ガイド部は、前記弁座の外周部分から弁体側へ向かい立ち上がっていることを特徴とするリリーフ弁。 A valve body and a valve box formed with a valve seat that is urged and brought into airtight contact with the valve body, and when the pressure of the gas guided to the valve box reaches a set value, A relief valve in which the valve body is separated from the valve seat to release the gas in the valve box to the outside;
The valve body is provided with a movable body that is provided integrally with the valve body and forms the gas flow path between the valve body and the inner wall of the valve box,
A first pressure receiving surface on which the pressure in the valve box always acts on the valve body, and a second pressure receiving surface on which the pressure in the valve box acts when the valve body is separated from the valve seat. And formed,
The movable body is formed with a third pressure receiving surface that receives the pressure in the valve box,
The inner wall of the valve box is formed with a small diameter portion that narrows the flow path in cooperation with the movable body when the valve body is separated from the valve seat,
The valve box is formed so that a guide portion that is slidably fitted in the valve body in an airtight state surrounds the second pressure receiving surface,
The relief valve according to claim 1, wherein the guide portion rises from the outer peripheral portion of the valve seat toward the valve body . 前記第３の受圧面は、前記第１の受圧面よりも大きいことを特徴とする請求項１に記載のリリーフ弁。   The relief valve according to claim 1, wherein the third pressure receiving surface is larger than the first pressure receiving surface. 前記可動体は、大径部と小径部とを有し、前記弁体が前記弁座から離間させられた際に、前記可動体の大径部と前記弁箱の小径部との間で前記流路を狭めることを特徴とする請求項１又は２に記載のリリーフ弁。   The movable body has a large-diameter portion and a small-diameter portion, and when the valve body is separated from the valve seat, the movable body is between the large-diameter portion of the movable body and the small-diameter portion of the valve box. The relief valve according to claim 1, wherein the flow path is narrowed. 前記弁体および可動体が、鉛直方向に移動可能に設けられ、質量により前記弁体が前記弁座へ向けて付勢されていることを特徴とする請求項１〜３の何れかに記載のリリーフ弁。 Said valve body and movable body, movable in the vertical direction, the mass by according to claim 1, wherein the valve body is characterized in that it is biased toward the valve seat Relief valve. 前記弁体を付勢する手段がバネであることを特徴とする請求項１〜３の何れかに記載のリリーフ弁。 The relief valve according to claim 1 , wherein the means for biasing the valve body is a spring.
JP2011207945A 2011-09-22 2011-09-22 Relief valve Active JP5539282B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2011207945A JP5539282B2 (en) 2011-09-22 2011-09-22 Relief valve
CN201210301139.0A CN103016802B (en) 2011-09-22 2012-08-22 Relief valve
TW101134390A TWI461620B (en) 2011-09-22 2012-09-20 Relief valve
KR1020120104840A KR101410622B1 (en) 2011-09-22 2012-09-21 Relief valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011207945A JP5539282B2 (en) 2011-09-22 2011-09-22 Relief valve

Publications (2)

Publication Number Publication Date
JP2013068287A JP2013068287A (en) 2013-04-18
JP5539282B2 true JP5539282B2 (en) 2014-07-02

Family

ID=47965731

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011207945A Active JP5539282B2 (en) 2011-09-22 2011-09-22 Relief valve

Country Status (4)

Country Link
JP (1) JP5539282B2 (en)
KR (1) KR101410622B1 (en)
CN (1) CN103016802B (en)
TW (1) TWI461620B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6259348B2 (en) * 2014-04-04 2018-01-10 株式会社 エマージー Processing tool cooling device and processing method
CN108012531A (en) * 2015-06-08 2018-05-08 Utc 消防及保安公司 Inside for monitored fire extinguishing system is installed by equipment
CN106005346B (en) * 2016-06-13 2017-10-24 朱德仲 A kind of rectifiable ventilation unit of marine fuel oil bin

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK171444B1 (en) * 1994-07-08 1996-10-28 Emil Aarestrup Soerensen Pressure relief valve for pressure relief between a closed room and the ambient atmosphere
KR19980065498U (en) * 1998-08-28 1998-11-25 주광일 Valve device of storage tank for transporting oil and chemicals
US6263907B1 (en) * 1998-08-28 2001-07-24 Korea Steel Power Co., Ltd. Valve device of a storage tank for transporting oils or chemical compounds
DK200001919A (en) * 2000-12-21 2002-06-22 Pres Vac Engineering As A valve
ATE306035T1 (en) * 2001-05-25 2005-10-15 Pres Vac Engineering As PRESSURE VALVE
JP2005003177A (en) * 2003-06-16 2005-01-06 Kayaba Ind Co Ltd Safety valve
WO2005038325A1 (en) * 2003-10-16 2005-04-28 Tank Tech Co., Ltd. Valve for safety valve of tank for storing and carrying oil or chemical substance, and apparatus for preventing valve seat from being freezed and/or ruptured
JP2008025734A (en) * 2006-07-21 2008-02-07 Hitachi Powdered Metals Co Ltd Relief valve
JP2008185163A (en) 2007-01-31 2008-08-14 Yoshitake Inc Relief valve
JP4469377B2 (en) * 2007-02-01 2010-05-26 新日本石油株式会社 Exhaust valve structure
CN201297398Y (en) * 2008-10-09 2009-08-26 中国航空工业第六一八研究所 Hydraulic gate valve conical surface sealing structure

Also Published As

Publication number Publication date
CN103016802B (en) 2015-05-20
CN103016802A (en) 2013-04-03
KR101410622B1 (en) 2014-06-20
TWI461620B (en) 2014-11-21
TW201329374A (en) 2013-07-16
JP2013068287A (en) 2013-04-18
KR20130032260A (en) 2013-04-01

Similar Documents

Publication Publication Date Title
KR101708002B1 (en) A venting valve for cargo tanks
JP5821769B2 (en) Damper device
JP5539282B2 (en) Relief valve
WO2010005641A2 (en) Pressure relief valves
JP2011517335A5 (en)
JP6295499B2 (en) Pressure release valve
JP7097430B2 (en) Valve device
US10371270B2 (en) Diaphragm valve
JP5360784B2 (en) Valve device
JP5911759B2 (en) Relief valve
JP5759763B2 (en) Pilot operated solenoid valve
DK2776747T3 (en) Vent valve for cargo tanks
AU2017210484B2 (en) Valve
US11215296B2 (en) Valve, in particular vacuum valve
JP6022224B2 (en) Relief valve
JP6938053B2 (en) Breathing valve
EP2977847A1 (en) Valve arrangement
JP5728319B2 (en) Exhaust valve
JP6217720B2 (en) solenoid valve
EP3538798B1 (en) Vacuum valve for cargo tanks in, for instance, oil tankers
JP4298375B2 (en) Seal structure and safety valve using the seal structure
JP6944178B2 (en) valve
US1123123A (en) Flush-valve.
JP5780895B2 (en) Exhaust valve
SE534481C2 (en) A gas cylinder, and a method for providing such a gas cylinder

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20130712

A871 Explanation of circumstances concerning accelerated examination

Free format text: JAPANESE INTERMEDIATE CODE: A871

Effective date: 20130712

A975 Report on accelerated examination

Free format text: JAPANESE INTERMEDIATE CODE: A971005

Effective date: 20130726

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20131120

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20131126

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20140127

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20140422

R150 Certificate of patent or registration of utility model

Ref document number: 5539282

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20140430

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250