JPH0222541Y2 - - Google Patents
Info
- Publication number
- JPH0222541Y2 JPH0222541Y2 JP16636684U JP16636684U JPH0222541Y2 JP H0222541 Y2 JPH0222541 Y2 JP H0222541Y2 JP 16636684 U JP16636684 U JP 16636684U JP 16636684 U JP16636684 U JP 16636684U JP H0222541 Y2 JPH0222541 Y2 JP H0222541Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- valve
- nozzle
- steel plate
- cavity
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Lift Valve (AREA)
- Safety Valves (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、主として高温高圧用の安全弁にお
ける弁座ノズルの改良に関する。[Detailed Description of the Invention] [Industrial Field of Application] This invention mainly relates to the improvement of a valve seat nozzle in a safety valve for high temperature and high pressure applications.
一般にこの種安全弁の弁座ノズルは、流体通路
がノド部を介して弁座に通ずるものであつたか
ら、流体の吹き出し時において、特に口径の狭い
ノド部の噴出蒸気が臨界流となり、その内周壁の
温度を急激に低下させるため、該部に熱収縮が起
り、その弁座面に歪を生じさせて弁体と均一に密
着するべきシール面が得難く、その結果、所定の
流体圧を維持することが出来ないという問題点が
見られたものである。
In general, in the valve seat nozzle of this type of safety valve, the fluid passage communicates with the valve seat through the throat part, so when the fluid is blown out, the jetted steam from the throat part with a particularly narrow diameter becomes a critical flow, and the inner peripheral wall of the valve seat nozzle becomes a critical flow. Due to the sudden drop in temperature, heat shrinkage occurs in that part, causing distortion in the valve seat surface and making it difficult to obtain a sealing surface that should be in uniform contact with the valve body.As a result, the specified fluid pressure is maintained. The problem was that it was not possible to do so.
そこで本考案は、弁座面の下方のノド部に鋼板
壁の上下縁を熔着して空室を設けると共に、該鋼
板壁の下部に多数の通孔を貫設して上記空室と流
体通路とを連通することにより叙上の問題点を解
決したものである。
Therefore, in the present invention, a cavity is created by welding the upper and lower edges of a steel plate wall to the throat below the valve seat surface, and a large number of through holes are penetrated through the lower part of the steel plate wall to connect the cavity and the fluid flow. The above-mentioned problems were solved by communicating with the passageway.
〔作用〕
上記構成の本案弁座ノズルは、安全弁の閉弁中
に高温蒸気が上記通孔を介して空室に充満して弁
座の内周を加熱しているため、開弁時のノド部に
臨界流が生じたとしても、該弁座付近の急激な温
度低下を防止するという作用を奏するものであ
る。[Operation] In the valve seat nozzle of the present invention having the above configuration, when the safety valve is closed, high-temperature steam fills the empty chamber through the above-mentioned hole and heats the inner periphery of the valve seat. Even if a critical flow occurs in the valve seat, it has the effect of preventing a rapid temperature drop in the vicinity of the valve seat.
以下、本案の構成を図面に示す実施例に基づい
て更に具体的に述べると、１は流体通路１ａがノ
ド部１ｂを介して弁座面１ｃに通ずる弁座ノズ
ル、２は上記弁座面下方のノド部１ｂに中央部分
が稍突出した鋼板壁２ａの上下縁を熔着して形成
された空室であつて、上記鋼板壁２ａ下方に多数
の通孔２ｂを貫設して該空室２と上記流体通路１
ａとを連通せしめたものである。
Hereinafter, the configuration of the present invention will be described in more detail based on the embodiment shown in the drawings. 1 is a valve seat nozzle in which a fluid passage 1a communicates with a valve seat surface 1c via a throat portion 1b, and 2 is a valve seat nozzle below the valve seat surface. This is a cavity formed by welding the upper and lower edges of a steel plate wall 2a with a slightly protruding central portion at the throat part 1b of the steel plate wall 2a. 2 and the fluid passage 1
It communicates with a.
尚、図中３は弁体を示す。 In addition, 3 in the figure shows a valve body.
而して、上記実施例に示した本案安全弁のノズ
ル構造は、その安全弁が閉弁している間、一次側
の高温蒸気が通孔２ｂを介して空室２内に充満
し、弁座ノズル１の内周を充分加熱しているた
め、開弁時に内部流体の吹き出しによつて上記ノ
ド部１ｂに臨界流が生じたとしても、周壁の温度
が急激に低下することがないから、弁座面１ｃに
熱収縮が生じることがないのである。 Therefore, in the nozzle structure of the safety valve of the present invention shown in the above embodiment, while the safety valve is closed, high temperature steam on the primary side fills the empty chamber 2 through the through hole 2b, and the valve seat nozzle Since the inner periphery of the valve seat 1 is sufficiently heated, even if a critical flow occurs in the throat section 1b due to internal fluid blowing out when the valve is opened, the temperature of the surrounding wall will not drop suddenly. This prevents thermal contraction from occurring on the surface 1c.
この場合、上記空室２内の高温蒸気は、開弁時
には臨界流によつて冷却されるが、蒸気の性質上
これが凝縮するため新しい高温蒸気が上記通孔２
ｂより吸入されて弁座部の熱収縮を防止のであ
る。 In this case, the high-temperature steam in the cavity 2 is cooled by the critical flow when the valve is opened, but due to the nature of steam, this condenses, so new high-temperature steam flows into the vent 2.
This prevents thermal contraction of the valve seat by being sucked in from b.
又、閉弁時には新たな蒸気が上記通孔２ｂを介
して上記空室２に流入するものであるから、少な
くとも閉弁時には高温蒸気によつて弁座内周を常
時加熱することが出来るのである。 Furthermore, since new steam flows into the cavity 2 through the through hole 2b when the valve is closed, the inner periphery of the valve seat can be constantly heated by high-temperature steam at least when the valve is closed. .
以上述べたように本案安全弁の弁座ノズル構造
によれば、弁座ノズル１の内周及び弁座面１ｃが
臨界流によつて影響を受けることがなく、弁体３
の着座時において正確なシール面が確保され、常
に所望の吹き出し圧が得られるという格別の効果
の他、弁座面１ｃ付近における熱歪が殆どないか
ら、該弁座面に対し熱膨脹率の異なるSTL２１，
２５等のコバルト基合金による厚い盛金が可能と
なり、耐摩耗性に優れた弁座が得られる等、従来
のこの種安全弁には期待出来なかつた優れた効果
が齎らされるものである。
As described above, according to the valve seat nozzle structure of the present safety valve, the inner periphery of the valve seat nozzle 1 and the valve seat surface 1c are not affected by the critical flow, and the valve body 3
In addition to the special effect of ensuring an accurate sealing surface and always obtaining the desired blowing pressure when the valve is seated, there is almost no thermal distortion in the vicinity of the valve seat surface 1c, so the coefficient of thermal expansion is different from that of the valve seat surface. STL21,
It is possible to form a thick metal plate made of a cobalt-based alloy such as No. 25, and a valve seat with excellent wear resistance can be obtained, bringing about excellent effects that could not be expected from conventional safety valves of this type.
第１図は本案弁座ノズルを備えた安全弁の一部
を切欠して示す部分正面図である。
尚、図中１……弁座ノズル、１ａ……流体通
路、１ｂ……ノド部、１ｃ……弁座面、２……空
室、２ａ……鋼板壁、２ｂ……通孔、３……弁
体。
FIG. 1 is a partially cutaway front view showing a safety valve equipped with the valve seat nozzle of the present invention. In the figure, 1... Valve seat nozzle, 1a... Fluid passage, 1b... Throat, 1c... Valve seat surface, 2... Vacant chamber, 2a... Steel plate wall, 2b... Through hole, 3... ...valve body.
Claims (1)
上下縁を熔着して空室２を設けると共に、該鋼板
壁の下部に多数の通孔２ｂを貫設して上記空室２
と流体通路１ａとを連通したことを特徴とする高
温高圧用の安全弁における弁座ノズル。 The upper and lower edges of the steel plate wall 2a are welded to the lower throat part 1b of the valve seat surface 1c to form a cavity 2, and a large number of through holes 2b are penetrated through the lower part of the steel plate wall to form the cavity 2.
A valve seat nozzle in a safety valve for high temperature and high pressure, characterized in that the valve seat nozzle communicates with a fluid passage 1a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16636684U JPH0222541Y2 (en) | 1984-10-31 | 1984-10-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16636684U JPH0222541Y2 (en) | 1984-10-31 | 1984-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6181075U JPS6181075U (en) | 1986-05-29 |
| JPH0222541Y2 true JPH0222541Y2 (en) | 1990-06-18 |
Family
ID=30724186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16636684U Expired JPH0222541Y2 (en) | 1984-10-31 | 1984-10-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0222541Y2 (en) |
-
1984
- 1984-10-31 JP JP16636684U patent/JPH0222541Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6181075U (en) | 1986-05-29 |
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