JPH1163262A - Steam safety valve - Google Patents

Steam safety valve

Info

Publication number
JPH1163262A
JPH1163262A JP23083797A JP23083797A JPH1163262A JP H1163262 A JPH1163262 A JP H1163262A JP 23083797 A JP23083797 A JP 23083797A JP 23083797 A JP23083797 A JP 23083797A JP H1163262 A JPH1163262 A JP H1163262A
Authority
JP
Japan
Prior art keywords
pressure
safety valve
valve
spring
leakage
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.)
Withdrawn
Application number
JP23083797A
Other languages
Japanese (ja)
Inventor
Masayuki Kawami
雅幸 川見
Yasuhiro Nagayo
康浩 長与
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP23083797A priority Critical patent/JPH1163262A/en
Publication of JPH1163262A publication Critical patent/JPH1163262A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent generation of pre-leakage by connecting a seal pot to a power assist cylinder which presses a valve rod of a spring type safety valve by means of a connection pipe, and providing a pilot safety valve which is connected to the communication pipe and made open with a specified pressure level or above. SOLUTION: The operation pressure of a pilot safety valve 4 is set slightly higher than a pre-leakage pressure of a spring safety valve 1. The pressure of a pressure vessel 01 rises over the specified pressure, that is, the pre-leakage pressure, the valve 4 is operated to release the pressure of a power assist cylinder 3. Namely, the moment the pressure in a seal pot 5 reaches a blow-out pressure, the valve 4 is operated to release the internal pressure of a cylinder 14. Then, a valve element 9 to which no pressure is added opens rapidly against the force of a spring to blow out steam. When the pressure of the vessel 01 reaches a blow-up pressure, the element 9 is sealed by the spring force. Accordingly, the leakage of safety valve is prevented.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、プラント配管、圧
力容器等の圧力逃がし装置に適用される蒸気安全弁に関
する。
The present invention relates to a steam safety valve applied to a pressure relief device such as a plant piping or a pressure vessel.

【0002】[0002]

【従来の技術】従来の圧力容器のばね式蒸気安全弁7を
図2に示す。
2. Description of the Related Art FIG. 2 shows a conventional spring-type steam safety valve 7 for a pressure vessel.

【0003】弁体9の弁棒2に、弁体を付勢するばね8
が取付けられる。そしてばね8の力により弁体9を押さ
えつけ、吹出圧力まで蒸気・水をシールするものであ
る。
[0003] A spring 8 for urging the valve stem 2 against the valve stem 2 of the valve body 9.
Is attached. Then, the valve body 9 is pressed by the force of the spring 8, and the steam and water are sealed up to the blowing pressure.

【0004】[0004]

【発明が解決しようとする課題】上記従来のばね式安全
弁は、ばねと弁体が直接連動するため、吹出し圧力付近
になると前漏れが発生するという問題点があった。
The above-mentioned conventional spring-type safety valve has a problem in that a pre-leakage occurs near the blowing pressure because the spring and the valve element are directly linked.

【0005】本発明は上記問題点を解決することを課題
とする。
An object of the present invention is to solve the above problems.

【0006】[0006]

【課題を解決するための手段】本発明は、上記課題を解
決するため次の手段を講ずる。
The present invention takes the following means to solve the above-mentioned problems.

【0007】すなわち、対象の圧力容器に設けられるば
ね式安全弁と、同ばね式安全弁の弁棒を押えるパワーア
シストシリンダと、上記圧力容器に一ポートがつながれ
他ポートが上記パワーアシストシリンダに連通管でつな
がれるシールポットと、同連通管につながれ、所定圧以
上で開くパイロット安全弁とを設ける。
That is, a spring-type safety valve provided in a target pressure vessel, a power assist cylinder for pressing a valve stem of the spring-type safety valve, and one port connected to the pressure vessel and another port connected to the power assist cylinder by a communication pipe. A seal pot that is connected and a pilot safety valve that is connected to the communication pipe and that opens at a predetermined pressure or more are provided.

【0008】以上において、パイロット安全弁の作動圧
力をばね式安全弁の前漏れ圧力より少し高い所定圧力に
設定しておく。通常は、圧力容器の圧力はシールポット
を介してパワーアシストシリンダに導かれ、パワーアシ
ストシリンダにより弁棒は押される。そして弁体はばね
力+αの力で押されている。
In the above, the operating pressure of the pilot safety valve is set to a predetermined pressure slightly higher than the front leak pressure of the spring-type safety valve. Normally, the pressure of the pressure vessel is guided to a power assist cylinder via a seal pot, and the valve stem is pushed by the power assist cylinder. Then, the valve body is pressed by the force of spring force + α.

【0009】圧力容器の圧力が、所定圧、すなわち前漏
れ圧力を、上昇すると、パイロット安全弁が作動し、パ
ワーアシストシリンダの圧力が抜ける。そして付加圧が
なくなった弁体はばね力に抗して急速に開き、蒸気を吹
き出す。圧力容器の圧力が吹き上り圧力以下になると、
弁体はばね力によりシールする。なお、その前にパイロ
ット安全弁もシールし、シリンダはシールポットを介し
て付加押力を回復する。このようにして、前漏れを生じ
ることなく作動することができる。
When the pressure in the pressure vessel rises to a predetermined pressure, that is, the pre-leakage pressure, the pilot safety valve operates and the pressure in the power assist cylinder is released. Then, the valve element that has lost the additional pressure opens rapidly against the spring force and blows out steam. When the pressure in the pressure vessel falls below the blow-up pressure,
The valve element is sealed by spring force. Prior to that, the pilot safety valve is also sealed, and the cylinder recovers the additional pressing force via the seal pot. In this way, it can operate without pre-leakage.

【0010】[0010]

【発明の実施の形態】本発明の実施の一形態を図1によ
り説明する。なお、従来例で説明した部分は、同一の番
号をつけ説明を省略し、この発明に関する部分を主体に
説明する。ばね式安全弁1の弁棒2をケーシングより上
方に突出さして設ける。そしてパワーシリンダ3のピス
トン12に連結する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The parts described in the conventional example are assigned the same reference numerals, and the description thereof will be omitted. The parts related to the present invention will be mainly described. The valve stem 2 of the spring-type safety valve 1 is provided so as to protrude above the casing. Then, it is connected to the piston 12 of the power cylinder 3.

【0011】一方、パワーシリンダ3とほぼ同レベルに
シールポット5が配置される。シールポット5の底部口
は、途中にループ16を有する圧力管13により圧力容
器01につながれる。またループ16とシールポット5
間の圧力管13にはオリフィス(またはニードル弁)6
が設けられる。
On the other hand, a seal pot 5 is arranged at substantially the same level as the power cylinder 3. The bottom port of the seal pot 5 is connected to a pressure vessel 01 by a pressure pipe 13 having a loop 16 in the middle. Loop 16 and seal pot 5
The orifice (or needle valve) 6
Is provided.

【0012】シールポット5の上部の口とパワーアップ
シリンダ3のシリンダ14の上部の口はパイロット安全
弁4を持つ連通管11でつながれる。またシリンダ14
の中部口(通常、ピストンのすぐ上にある)はシールポ
ット5側に下る傾斜のドレン管15によりシールポット
5の中部口につながれる。
The upper port of the seal pot 5 and the upper port of the cylinder 14 of the power-up cylinder 3 are connected by a communication pipe 11 having a pilot safety valve 4. In addition, cylinder 14
(Usually immediately above the piston) is connected to the center port of the seal pot 5 by an inclined drain pipe 15 descending to the seal pot 5 side.

【0013】以上において、設計上の設定吹出し圧力F
P ,ばね式安全弁1の吹出し圧力F S ,パワーアシスト
シリンダ3の押付力相当圧力FA とする。そしてFA
式1を満すように設定する。ただしその他は式2,3の
関係にある。
In the above, the set blowing pressure F in design
P, Spring pressure F of spring type safety valve 1 S, Power assist
Pressure F equivalent to the pressing force of cylinder 3AAnd And FATo
Set so as to satisfy Equation 1. However, the others are of the formulas 2 and 3.
In a relationship.

【0014】 ・FS +FA >FP (FS +FA はFP の約110%) …………(1) ・FS <FP (FS はFP の約90%) …………(2) ・FS ≫FA (FA はFP の約20%) …………(3) また、パイロット安全弁4の吹止まり圧力は、ばね式安
全弁7の吹止まり圧力より小さく設定する。
F S + F A > F P (F S + F A is about 110% of F P ) (1) F S <F P (F S is about 90% of F P ) ...... (2) · F S »F a ( about 20% of F a is F P) ............ (3) Further,吹止Mari pressure of the pilot relief valve 4 is smaller than吹止Mari spring pressure safety valve 7 Set.

【0015】以上において、通常は図1に示すように、
圧力管13のループ16から上方にはシール水(ドレ
ン)が溜っている。またパイロット安全弁4は閉なの
で、圧力容器01からの蒸気圧により弁棒2にはばね力
+FA が加わっている。
In the above, usually, as shown in FIG.
Seal water (drain) is stored above the loop 16 of the pressure pipe 13. Since the pilot safety valve 4 is a closed, the valve rod 2 by the steam pressure from the pressure vessel 01 is applied spring force + F A is.

【0016】圧力容器01の圧力が、所定圧、すなわち
前漏れ圧力を越え、上昇すると、パイロット安全弁4が
作動し、パワーアシストシリンダ3の圧力が抜ける。す
なわち、シールポット内5の圧力が吹出し圧力に達した
瞬間、パイロット安全弁4が作動し、シリンダ14の内
圧を解放する。そして付加圧がなくなった弁体9は、ば
ね力に抗して急速に開き、蒸気を吹き出す。
When the pressure in the pressure vessel 01 exceeds a predetermined pressure, that is, the pre-leak pressure, and rises, the pilot safety valve 4 is operated, and the pressure in the power assist cylinder 3 is released. That is, the moment the pressure in the seal pot 5 reaches the blowout pressure, the pilot safety valve 4 operates to release the internal pressure of the cylinder 14. Then, the valve body 9 from which the additional pressure has disappeared opens rapidly against the spring force and blows out steam.

【0017】圧力容器01の圧力が吹き上り圧力になる
と、弁体2はばね力によりシールする。なお、その前
に、パイロット安全弁4もシールし、パワーアシストシ
リンダ3はシールポット5を介して付加押力を回復す
る。この間オリフィス6は圧力の急回復を防止する。
When the pressure in the pressure vessel 01 becomes a blow-up pressure, the valve body 2 is sealed by spring force. Before that, the pilot safety valve 4 is also sealed, and the power assist cylinder 3 recovers the additional pressing force via the seal pot 5. During this time, the orifice 6 prevents a sudden recovery of the pressure.

【0018】また、パイロット安全弁4の作動により、
ピストン12が急上昇し、点線で示す位置にくる。その
間、ドレン管15の口を閉じる。このため、シールポッ
ト5中のドレンaはパイロット安全弁4より一部は噴出
するが、一部は残る。さらにシリンダ14内に発生する
ドレンはドレン管15を通りシールポット5にじょじょ
に溜り、作動前の状態に復帰する。
Further, by operating the pilot safety valve 4,
The piston 12 rises rapidly and comes to the position shown by the dotted line. Meanwhile, the mouth of the drain pipe 15 is closed. Therefore, a part of the drain a in the seal pot 5 is ejected from the pilot safety valve 4, but a part remains. Further, the drain generated in the cylinder 14 passes through the drain pipe 15 and gradually accumulates in the seal pot 5, and returns to the state before the operation.

【0019】なお、ドレンをシールポット5へ溜めるこ
とにより、パワーアシストシリンダ3の作動がよくなる
とともに圧力容器01へ戻さないので、ドレンによる機
器への害を回避できる。
By storing the drain in the seal pot 5, the operation of the power assist cylinder 3 is improved and the power assist cylinder 3 is not returned to the pressure vessel 01, so that damage to the equipment due to the drain can be avoided.

【0020】以上のようにして、前漏れを生じることな
く、かつ十分な信頼性で作動することが可能となる。
As described above, it is possible to operate without a pre-leakage and with sufficient reliability.

【0021】[0021]

【発明の効果】以上に説明したように本発明は、ばね式
安全弁の弁棒を押えるパワーアシストシリンダと、圧力
容器に一ポートがつながれ他ポートがパワーアシストシ
リンダに連通管でつながれるシールポットと、同連通管
につながれるパイロット安全弁とを設けた。これによ
り、通常は、パワーアシストシリンダにより弁棒は付加
力を受けている。所定圧力に達すると、パイロット安全
弁が開き付加圧力が消え、安全弁が急速に開く。したが
って安全弁の前漏れが防止できる。
As described above, the present invention relates to a power assist cylinder for holding a valve stem of a spring-type safety valve, and a seal pot in which one port is connected to a pressure vessel and the other port is connected to the power assist cylinder by a communication pipe. And a pilot safety valve connected to the communication pipe. As a result, the valve stem is normally subjected to additional force by the power assist cylinder. When the predetermined pressure is reached, the pilot safety valve opens and the applied pressure disappears, and the safety valve opens rapidly. Therefore, the front leakage of the safety valve can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の一形態の構成系統図である。FIG. 1 is a configuration system diagram of an embodiment of the present invention.

【図2】従来例の断面図である。FIG. 2 is a sectional view of a conventional example.

【符号の説明】[Explanation of symbols]

1 ばね式安全弁 01 圧力容器 2 弁棒 3 パワーアシストシリンダ 4 パイロット安全弁 5 シールポット 6 オリフィス 8 ばね 9 弁体 11 連通管 12 ピストン 13 圧力管 14 シリンダ 15 ドレン管 16 ループ DESCRIPTION OF SYMBOLS 1 Spring type safety valve 01 Pressure vessel 2 Valve rod 3 Power assist cylinder 4 Pilot safety valve 5 Seal pot 6 Orifice 8 Spring 9 Valve body 11 Communication pipe 12 Piston 13 Pressure pipe 14 Cylinder 15 Drain pipe 16 Loop

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 対象の圧力容器に設けられるばね式安全
弁と、同ばね式安全弁の弁棒を押えるパワーアシストシ
リンダと、上記圧力容器に一ポートがつながれ他ポート
が上記パワーアシストシリンダに連通管でつながれるシ
ールポットと、同連通管につながれ、所定圧以上で開く
パイロット安全弁とを備えてなることを特徴とする蒸気
安全弁。
1. A spring-type safety valve provided in a target pressure vessel, a power assist cylinder for pressing a valve stem of the spring-type safety valve, and one port connected to the pressure vessel and another port communicating with the power assist cylinder. A steam safety valve comprising: a seal pot connected to the pipe; and a pilot safety valve connected to the communication pipe and opened at a predetermined pressure or higher.
JP23083797A 1997-08-27 1997-08-27 Steam safety valve Withdrawn JPH1163262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23083797A JPH1163262A (en) 1997-08-27 1997-08-27 Steam safety valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23083797A JPH1163262A (en) 1997-08-27 1997-08-27 Steam safety valve

Publications (1)

Publication Number Publication Date
JPH1163262A true JPH1163262A (en) 1999-03-05

Family

ID=16914068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23083797A Withdrawn JPH1163262A (en) 1997-08-27 1997-08-27 Steam safety valve

Country Status (1)

Country Link
JP (1) JPH1163262A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100646869B1 (en) * 2005-10-13 2006-11-23 조광아이엘아이주식회사 Pressure emission system using pilot valve
CN104235478A (en) * 2014-09-10 2014-12-24 永一阀门集团有限公司 Impulse safety valve
CN106122543A (en) * 2016-07-20 2016-11-16 上海宇航系统工程研究所 A kind of excessive valve of gaps formula peace
CN106195369A (en) * 2016-07-20 2016-12-07 上海宇航系统工程研究所 A kind of chamber isolated peace is overflow valve and method of work

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100646869B1 (en) * 2005-10-13 2006-11-23 조광아이엘아이주식회사 Pressure emission system using pilot valve
CN104235478A (en) * 2014-09-10 2014-12-24 永一阀门集团有限公司 Impulse safety valve
CN106122543A (en) * 2016-07-20 2016-11-16 上海宇航系统工程研究所 A kind of excessive valve of gaps formula peace
CN106195369A (en) * 2016-07-20 2016-12-07 上海宇航系统工程研究所 A kind of chamber isolated peace is overflow valve and method of work

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20041102