JPH0740776Y2 - Valve device - Google Patents
Valve deviceInfo
- Publication number
- JPH0740776Y2 JPH0740776Y2 JP1988134501U JP13450188U JPH0740776Y2 JP H0740776 Y2 JPH0740776 Y2 JP H0740776Y2 JP 1988134501 U JP1988134501 U JP 1988134501U JP 13450188 U JP13450188 U JP 13450188U JP H0740776 Y2 JPH0740776 Y2 JP H0740776Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- main valve
- small
- hole
- inner hole
- 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 - Fee Related
Links
Landscapes
- Sliding Valves (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は互いに同芯状の主弁と小弁とをケージの内部に
備えた弁装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a valve device having a main valve and a small valve concentric with each other inside a cage.
ケージ弁の一種として、ケージの内部に互いに同芯状の
主弁と小弁とを備えたものが知られている。第５図は従
来におけるこの種の弁装置要部の縦断面図であって、こ
れを同図に基づいて説明すると、弁装置は互いにフラン
ジ接合されたボンネット１とボデイ２とを備えており、
ボデイ２には上流側の管路に接合された上室３と、下流
側の管路に接合された下室４とが隔壁５によって隔成さ
れている。上室３内には周壁に孔6aを有する円筒状のケ
ージ６が、ボンネット１と隔壁５とで上下両端部を固定
されて設けられており、このケージ６の下側開口端部に
は主弁座6bが形成されている。ケージ６の内孔には、円
筒状に形成された主弁７が下端の着座部を主弁座6bに臨
ませて軸方向へ進退自在に嵌合されており、その上側開
口端には、主弁７上方の平衡室８と主弁７の内室とを連
通させる通孔9aを備えたバックシート９が嵌着固定され
ている。主弁７の内孔下端部には、小弁座7aが形成され
ており、バックシート９に進退自在に支持された弁軸10
の下端部には、下端の着座部を小弁座7aに臨ませた小弁
11が、主弁７の内孔内に位置して固定されている。主弁
７の内孔内には、小弁11を開方向に付勢する弁ばね12が
介装されている。As a kind of cage valve, there is known one having a main valve and a small valve concentric with each other inside the cage. FIG. 5 is a vertical cross-sectional view of a main part of a valve device of this type in the related art. When the valve device is described with reference to FIG. 5, the valve device includes a bonnet 1 and a body 2 that are flange-joined to each other.
An upper chamber 3 joined to the upstream pipe line and a lower chamber 4 joined to the downstream pipe line are separated from each other by a partition wall 5 in the body 2. A cylindrical cage 6 having a hole 6a in its peripheral wall is provided in the upper chamber 3 with its upper and lower ends fixed by a bonnet 1 and a partition wall 5. The valve seat 6b is formed. A main valve 7 formed in a cylindrical shape is fitted in the inner hole of the cage 6 so that the seating portion at the lower end faces the main valve seat 6b and is movable back and forth in the axial direction. A back seat 9 having a through hole 9a for communicating the equilibrium chamber 8 above the main valve 7 and the inner chamber of the main valve 7 is fitted and fixed. A small valve seat 7a is formed at the lower end of the inner hole of the main valve 7, and the valve shaft 10 is supported by the back seat 9 so as to be movable back and forth.
At the lower end of the small valve, the seat of the lower end faces the small valve seat 7a.
11 is fixed in the inner hole of the main valve 7. A valve spring 12 for urging the small valve 11 in the opening direction is provided in the inner hole of the main valve 7.
このように構成された弁装置において、図示しないアク
チュエータにより弁軸10が弁ばね12の弾発力に抗して下
降された図示の弁全閉状態では、平衡室８内の圧力はピ
ストンリングからの漏洩により上室３の圧力と同圧であ
り、主弁７は閉方向の力を受けて閉止状態を維持してい
る。In the valve device configured as described above, in the valve fully closed state shown in the drawing in which the valve shaft 10 is lowered against the elastic force of the valve spring 12 by the actuator (not shown), the pressure in the equilibrium chamber 8 is reduced from the piston ring. Is the same as the pressure in the upper chamber 3, and the main valve 7 receives the force in the closing direction and maintains the closed state.
この状態から弁全開状態にする場合には、アクチュエー
タにより弁軸10を上昇させて小弁11を開くと、平衡室８
と下室４とが通孔9aで連通されてこれら両室8,4が同圧
となり、主弁７の不平衡力が減じるので、弁軸10の鍔部
がバックシート９に当接したのちは、小さい操作力で弁
が開方向へ移動する。中間開度の場合、主弁７は微小で
はあるが流体圧により常に閉方向への力を受けており、
弁軸10の開方向への力と平衡する。When the valve is fully opened from this state, the valve shaft 10 is raised by the actuator and the small valve 11 is opened.
Since the lower chamber 4 and the lower chamber 4 are communicated with each other through the through hole 9a and the pressures in the chambers 8 and 4 are equalized, the unbalanced force of the main valve 7 is reduced. The valve moves in the opening direction with a small operating force. In the case of the intermediate opening degree, the main valve 7 receives a force in the closing direction due to the fluid pressure although it is minute,
Balance with the force of the valve shaft 10 in the opening direction.
このように主弁７と小弁11を備えた弁装置は小型のアク
チュエータで大容量の内弁を操作できるるとともに、弁
閉時には主弁７が完全閉止状態を維持するという特長を
有する。As described above, the valve device including the main valve 7 and the small valve 11 is characterized in that a small actuator can operate a large-capacity inner valve, and the main valve 7 maintains a completely closed state when the valve is closed.
しかしながら、このような従来の弁装置においては、弁
ばね12の弾発力により小弁11の復元力を得るものである
ために、弁を中間開度とした場合に、主弁７に作用する
噴流の不安定性と、弁ばねや質量系の振動特性とが重な
っていわゆる共振現象が発生することがある。すなわ
ち、主弁７が弁ばね12を介して弁軸10と小弁11に吊るさ
れているという構造であるために、適当な加振力が噴流
によって与えられると、主弁７に大振幅の縦振動が発生
し、弁開度が安定しないという問題がある。However, in such a conventional valve device, since the restoring force of the small valve 11 is obtained by the elastic force of the valve spring 12, it acts on the main valve 7 when the valve has an intermediate opening degree. The so-called resonance phenomenon may occur due to the instability of the jet flow and the vibration characteristics of the valve spring and the mass system. That is, since the main valve 7 has a structure in which it is suspended by the valve shaft 10 and the small valve 11 via the valve spring 12, when an appropriate exciting force is applied by the jet flow, the main valve 7 will have a large amplitude. There is a problem that the valve opening is not stable due to vertical vibration.
そこで弁ばね12の剛性を高めて振動を回避することが行
われているが、噴流の非定常な流れが定量的に予測でき
ず、加振力の見積りが難しいばかりでなく、剛性の高い
弁ばねを狭いスペース内に組込むことは設計上難しいと
いう問題があった。Therefore, it has been attempted to increase the rigidity of the valve spring 12 to avoid vibration, but the unsteady flow of the jet flow cannot be quantitatively predicted, and it is difficult to estimate the excitation force and the valve with high rigidity is used. There is a problem that it is difficult in terms of design to incorporate the spring into the narrow space.
このような課題を解決するために本考案に係る弁装置
は、ケージの内孔端部に形成した主弁座に着座部を臨ま
せケージの内孔に軸方向に進退自在に嵌合された円筒状
の主弁と、この主弁の内孔端部に形成された小弁座に着
座部を臨ませ主弁の内孔に軸方向に進退自在に嵌合され
その開弁時に主弁の軸方向両側の室を連通させる小弁と
を備え、この小弁の前記主弁との嵌合部に反主弁座側が
大径の段差部を設けるとともに、この大径の段差部に軸
方向で対向するように主弁の内孔内で反主弁座側が大径
の段差部を設け、かつこれらの段差部間で小弁外周部と
主弁との内孔内周部とによって囲まれた環状空間部と、
主弁、ケージ間に上流側管路に連通させて設けた環状空
間部とを、主弁に形成した通孔によって連通させたもの
である。In order to solve such a problem, the valve device according to the present invention has a main valve seat formed at the end of the inner hole of the cage with the seating portion facing the seat, and is fitted in the inner hole of the cage so as to be axially movable back and forth. A cylindrical main valve and a small valve seat formed at the end of the inner hole of this main valve, with their seats facing, are fitted in the inner hole of the main valve so that they can move back and forth in the axial direction. A small valve that connects the chambers on both sides in the axial direction is provided, and a step portion having a large diameter on the side opposite to the main valve seat side is provided at the fitting portion of the small valve with the main valve, and the step portion having the large diameter is provided with an axial direction. Are provided in the inner hole of the main valve on the side opposite to the main valve seat side so as to face each other, and are surrounded by the outer peripheral portion of the small valve and the inner peripheral portion of the inner hole of the main valve between these stepped portions. A circular space part,
An annular space provided between the main valve and the cage in communication with the upstream pipe line is connected by a through hole formed in the main valve.
本考案によれば、アクチュエータにより弁軸が下降して
いる弁全閉状態では、上流側管路の流体圧力は、ケージ
の孔から主弁、ケージ間の環状空間部と、これに通孔に
より連通する主弁、小弁での段差部間に形成された環状
空間部とを経て主弁に下向きの力として作用するので、
下流側管路の流体圧力との差圧によって、主弁は閉方向
への力を受けて閉止状態を維持する。According to the present invention, in the valve fully closed state in which the valve shaft is lowered by the actuator, the fluid pressure in the upstream pipe line is changed from the cage hole to the main valve, the annular space between the cage and the through hole. Since it acts as a downward force on the main valve via the communicating main valve and the annular space formed between the stepped portions of the small valve,
The main valve receives a force in the closing direction due to the pressure difference between the main valve and the fluid pressure in the downstream pipeline, and maintains the closed state.
また、この閉止状態から、アクチュエータにより弁軸を
上昇させて小弁を開くと、主弁と小弁との内部に設けた
通孔により弁の上下が連通されて下流側管路と同圧とな
る。すると、小弁が上昇してバックシートに当たるが、
このとき小弁、主弁での段差部間の環状空間部へは、ケ
ージの孔と、ケージ、主弁間の環状空間部を経て上流側
管路の圧力が作用しているので、小弁は上向きの力を受
けてバックシートに押付けられ、がたつくことなく固定
されて主弁と一体になることにより、主弁が開き始める
ことになる。When the valve shaft is raised by the actuator to open the small valve from this closed state, the upper and lower sides of the valve communicate with each other through the through holes provided inside the main valve and the small valve, and the same pressure as the downstream side pipe line is established. Become. Then, the small valve rises and hits the back seat,
At this time, the pressure in the upstream pipe acts on the annular space between the small valve and the main valve via the cage space and the annular space between the cage and the main valve. Is pressed against the back seat by an upward force and is fixed without rattling and becomes integral with the main valve, so that the main valve starts to open.
特に、本考案によれば、主弁と小弁との動きを、これら
各弁の段差部間に形成した環状空間部への上流側管路の
圧力の導入による静圧を巧みに利用し、その一方向への
作用力を用いて、所定の状態で得ているもので、従来の
ようなばねが不要となり、自励振動が発生しない。In particular, according to the present invention, the movement of the main valve and the small valve is skillfully utilized by the static pressure by the introduction of the pressure of the upstream side pipe line into the annular space formed between the stepped portions of these valves, This is obtained in a predetermined state by using the acting force in one direction, so that the conventional spring is unnecessary and self-excited vibration does not occur.
第１図ないし第３図は本考案に係る弁装置の実施例を示
し、第１図は全閉状態で示す弁装置の縦断面図、第２図
は小弁の開放状態で示す弁装置の縦断面図、第３図は主
弁の開放状態で示す弁装置の縦断面図である。ボデイと
ボンネットについては第５図に示す従来の弁装置と同じ
であるから同図を用いて説明する。すなわち、弁装置
は、前述した第５図に示されるように、互いにフランジ
接合されたボンネット１とボデイ２とを備えており、ボ
デイ２には上流側の管路に接合された上室３と、下流側
の管路に接合された下室４とが隔壁５によって隔成され
ている。1 to 3 show an embodiment of a valve device according to the present invention. FIG. 1 is a longitudinal sectional view of the valve device shown in a fully closed state, and FIG. 2 is a valve device shown in an opened state of a small valve. FIG. 3 is a vertical cross-sectional view of the valve device showing the main valve in an open state. Since the body and bonnet are the same as those of the conventional valve device shown in FIG. 5, they will be described with reference to FIG. That is, as shown in FIG. 5 described above, the valve device includes a bonnet 1 and a body 2 that are flange-joined to each other, and the body 2 has an upper chamber 3 that is joined to an upstream pipe line. The partition wall 5 separates the lower chamber 4 joined to the downstream pipe line.
上室３内には周壁に複数個の孔20aを有する円筒状のケ
ージ20が、ボンネット１と隔壁５とで上下両端部を固定
されて設けられており、このケージ20の内孔下端部に
は、主弁座20bが形成されている。ケージ20の内孔20cに
は、外周が鼓形の筒状に形成された主弁21が、下端の着
座部を主弁座20bに臨ませて軸方向へ進退自在に嵌合さ
れており、その上側開口端には、鍔付き筒状に形成され
たバックシート22が嵌着固定されている。主弁21の内孔
下端部には、小弁座21aが形成されており、この小弁座2
1aと第５図に示す下室４とは、主弁21の下端部に穿設さ
れた複数個の通孔21bによって連通されている。また主
弁21の外周部を鼓形にすることにより形成された環状空
間部23と第５図に示す上室３とは、前記ケージ20の孔20
aによって連通されている。A cylindrical cage 20 having a plurality of holes 20a in its peripheral wall is provided in the upper chamber 3 with its upper and lower ends fixed by the bonnet 1 and the partition wall 5, and at the lower end of the inner hole of the cage 20. Has a main valve seat 20b formed therein. In the inner hole 20c of the cage 20, a main valve 21 whose outer periphery is formed in a drum shape is fitted so that the seating portion at the lower end faces the main valve seat 20b and is movable back and forth in the axial direction. A back sheet 22 formed in a tubular shape with a collar is fitted and fixed to the upper open end thereof. A small valve seat 21a is formed at the lower end of the inner hole of the main valve 21.
The lower chamber 4 shown in FIG. 5 is communicated with the lower chamber 4 shown in FIG. 5 by a plurality of through holes 21b formed at the lower end of the main valve 21. Further, the annular space portion 23 formed by forming the outer peripheral portion of the main valve 21 into a drum shape and the upper chamber 3 shown in FIG.
communicated by a.
24は上側小径部24aと大径部24bと下側小径部24cとで段
差付きの円柱状に形成された小弁であって、大径部24b
と下側小径部24cとを主弁21の内孔に軸方向へ進退自在
に嵌合されており、その下端の着座部は小弁座21aに臨
んでいる。小弁24の外周部には、前記大径部24b下端側
の段差部とこれに軸方向で対向するように前記主弁21の
内孔20c内での上端側（反主弁座20b側）に形成した大径
孔部による段差部との間で、前記小弁24の外周部と主弁
21の内孔20cでの大径孔内周部とによって囲まれた環状
空間部25が形成されている。そして、この環状空間25
は、前記主弁21、ケージ20間に形成されかつ前記孔20a
によって第５図に示した上室３（上流側管路）に連通し
ている環状空間部23に対し、前記主弁21に径方向に向っ
て設けた通孔21dによって連通されている。Reference numeral 24 is a small valve formed in a columnar shape with a step by an upper small diameter portion 24a, a large diameter portion 24b and a lower small diameter portion 24c.
The lower small-diameter portion 24c and the lower small-diameter portion 24c are fitted in the inner hole of the main valve 21 so as to be movable back and forth in the axial direction, and the seating portion at the lower end thereof faces the small valve seat 21a. On the outer peripheral portion of the small valve 24, the step portion on the lower end side of the large diameter portion 24b and the upper end side (anti-main valve seat 20b side) in the inner hole 20c of the main valve 21 so as to face the step portion in the axial direction. Between the outer peripheral portion of the small valve 24 and the main valve between the step portion formed by the large diameter hole formed in
An annular space portion 25 surrounded by the inner peripheral portion of the large-diameter hole of the inner hole 20c of 21 is formed. And this annular space 25
Is formed between the main valve 21 and the cage 20 and the hole 20a.
The annular space 23 communicating with the upper chamber 3 (upstream pipe line) shown in FIG. 5 is communicated with the main valve 21 through a through hole 21d provided in the radial direction.
小弁24の上端ねじ孔には、図示しないアクチュエータに
連結された弁軸26のねじ部が螺合されており、アクチュ
エータで弁軸26を進退させることにより小弁24が小弁座
21aを開閉するように構成されている。小弁24の中心部
を貫通して設けられた貫通孔24dと、小弁24の下端部に
形成された環状空間部27との間は、通孔24eで連通され
ており、また貫通孔24dと、小弁24のバックシート22対
応部に形成された環状空間部28との間は、通孔24fで連
通されている。こうすることにより、弁軸26が上昇して
小弁24が小弁座21aを開いたときには、主弁21上方の平
衡室29と主弁21下方の下室４とが、通孔21b,環状空間部
27,通孔24e,貫通孔24d、通孔24f,環状空間部28を経て連
通されるように構成されている。The threaded portion of the valve shaft 26 connected to an actuator (not shown) is screwed into the upper end screw hole of the small valve 24. By moving the valve shaft 26 forward and backward with the actuator, the small valve 24 is moved to the small valve seat.
It is configured to open and close 21a. A through hole 24d provided through the central portion of the small valve 24 and an annular space 27 formed at the lower end portion of the small valve 24 are connected by a through hole 24e, and the through hole 24d is also formed. And an annular space portion 28 formed in the portion corresponding to the back seat 22 of the small valve 24 are communicated with each other by a through hole 24f. By doing so, when the valve shaft 26 rises and the small valve 24 opens the small valve seat 21a, the equilibrium chamber 29 above the main valve 21 and the lower chamber 4 below the main valve 21 form a through hole 21b and an annular shape. Space section
27, the through hole 24e, the through hole 24d, the through hole 24f, and the annular space portion 28 so as to communicate with each other.
以上のように構成された弁装置の動作を説明する。第１
図に示すように、アクチュエータにより弁軸26が下降さ
れた弁全閉状態では、小弁24が小弁座21aを閉じるとと
もに、上流側管路の流体圧力P1は、ケージ20の孔20aか
ら主弁21,ケージ20間の環状空間部23およびこれと通孔2
1dで連通する小弁24の段差部で囲まれた環状空間部25と
を経て主弁21に作用するので、この圧力P1と下流側管路
の圧力P2との差圧により主弁21は閉方向の力を受けて確
実な閉止状態を維持する。The operation of the valve device configured as above will be described. First
As shown in the figure, in the valve fully closed state in which the valve shaft 26 is lowered by the actuator, the small valve 24 closes the small valve seat 21a, and the fluid pressure P 1 of the upstream side pipe is from the hole 20a of the cage 20. An annular space 23 between the main valve 21 and the cage 20 and the through hole 2
Since it acts on the main valve 21 via the annular space 25 surrounded by the stepped portion of the small valve 24 communicating with 1d, the main valve 21 is acted on by the pressure difference between this pressure P 1 and the pressure P 2 on the downstream side pipeline. Receives a force in the closing direction and maintains a reliable closed state.
この状態から第２図に示すように、アクチュエータによ
り弁軸26を上昇させて小弁24により小弁座21aを開く
と、主弁21上方の平衡室29と、主弁21下方の下室４と
が、通孔21b,環状空間部27,通孔24e,貫通孔24d、通孔24
f,環状空間部28を経て連通されて下流側管路の圧力P2と
同圧になる。小弁24が上昇してその上側小径部24aと大
径部24bとの段差部がバックシート22に当るが、このと
き小弁24の大径部24b下端側の段差部とこれに軸方向で
対向している主弁21の内孔内での大径孔部による段差部
との間に囲まれて形成されている環状空間部25には、ケ
ージ20の孔20aと、ケージ20,主弁21間の環状空間部23お
よび通孔21dを経て上流側管路の圧力P1が作用するの
で、小弁24は上向きの力を受けてバックシートに22に押
付けられ、がたつくことなく固定されて主弁21と一体に
なることにより主弁21が開き始める。第３図は主弁21が
開いた状態を示しており、この主弁21の開放に際して
は、主弁21と小弁24とが一体となっており、かつ主弁21
上下の圧力が釣り合って軸推力がほとんどゼロになるの
で、弁駆動力が小さくてよい。また、ケージ20と主弁21
との間の非定常なすき間流れが存在せず、ばねを用いな
いので振動が発生しない。From this state, as shown in FIG. 2, when the valve shaft 26 is raised by the actuator and the small valve seat 21a is opened by the small valve 24, the equilibrium chamber 29 above the main valve 21 and the lower chamber 4 below the main valve 21. And through hole 21b, annular space 27, through hole 24e, through hole 24d, through hole 24
f, which is communicated via the annular space portion 28 and becomes the same pressure as the pressure P 2 of the downstream side pipeline. The small valve 24 rises and the step portion between the upper small diameter portion 24a and the large diameter portion 24b hits the back seat 22, but at this time, the step portion on the lower end side of the large diameter portion 24b of the small valve 24 and this in the axial direction. The annular space 25 formed between the facing inner wall of the main valve 21 and the step formed by the large-diameter hole has a hole 20a of the cage 20, the cage 20, and the main valve. Since the pressure P 1 of the upstream side pipe acts through the annular space portion 23 between 21 and the through hole 21d, the small valve 24 receives the upward force and is pressed against the back seat 22 and is fixed without rattling. When integrated with the main valve 21, the main valve 21 starts to open. FIG. 3 shows a state in which the main valve 21 is opened. When the main valve 21 is opened, the main valve 21 and the small valve 24 are integrated and the main valve 21
The valve driving force may be small because the axial thrust is almost zero as the upper and lower pressures are balanced. Also, the cage 20 and the main valve 21
Since there is no unsteady gap flow between and, and no spring is used, vibration does not occur.
第４図は本考案の他の実施例を第１図に対応して全閉状
態で示す弁装置の縦断面図であって、本実施例において
は、小弁24の主弁21との嵌合部にラビリンス溝24g,24h
が設けられている。こうすることにより、環状空間部2
8,25,27内の圧力保持効果が向上し、特殊な材質のシー
ル部材を必要としない。FIG. 4 is a longitudinal sectional view of a valve device showing another embodiment of the present invention in a fully closed state corresponding to FIG. 1, and in this embodiment, the small valve 24 is fitted with the main valve 21. Labyrinth groove 24g, 24h at joint
Is provided. By doing this, the annular space 2
The pressure holding effect inside 8,25,27 is improved, and no special sealing material is required.
以上説明したように本考案に係る弁装置によれば、ケー
ジの内孔端部に形成した主弁座に着座部を臨ませケージ
の内孔に軸方向に進退自在に嵌合された円筒状の主弁
と、この主弁の内孔端部に形成された小弁座に着座部を
臨ませ主弁の内孔に軸方向に進退自在に嵌合されその開
弁時に主弁の軸方向両側の室を連通させる小弁とを備
え、この小弁の前記主弁との嵌合部に反主弁座側が大径
の段差部を設けるとともに、この大径の段差部に軸方向
で対向するように主弁の内孔内で反主弁座側が大径の段
差部を設け、かつこれらの段差部間で小弁外周部と主弁
の内孔内周部とによって囲まれた環状空間部を、主弁、
ケージ間に上流側管路に連通させて設けた環状空間部
に、主弁に形成した通孔によって連通させたことによ
り、弁閉に際してはこれら両方の環状空間部に上流側管
路の圧力が作用するので、弁の閉止性能が向上する。ま
た、弁開に際しては、小弁が開くと、上流側管路の圧力
による静圧が、小弁に対し上向きの力として作用しこれ
を主弁側に固定して一体化させるとともに、主弁の上下
が同圧となって軸推力が小さくなるので、弁軸駆動力が
小さくなってアクチュエータを小容量にすることがで
き、かつ従来のようなケージ、主弁間の非定常なすき間
流れによる振動や、噴流とばねの弾発力とによる共振現
象がなくなって弁開度が安定する。As described above, according to the valve device of the present invention, the cylindrical shape is fitted in the inner hole of the cage so that the main valve seat formed at the end of the inner hole of the cage faces the seat, and is axially movable back and forth. The main valve and the small valve seat formed at the end of the inner hole of the main valve face the seating portion, and are fitted in the inner hole of the main valve so as to move back and forth in the axial direction. A small valve that connects the chambers on both sides is provided, and a step portion having a large diameter on the side opposite to the main valve seat side is provided at the fitting portion of the small valve with the main valve, and the step portion having the large diameter is axially opposed to the step portion. As described above, an annular space surrounded by the outer periphery of the small valve and the inner periphery of the inner hole of the main valve is provided in the inner hole of the main valve by providing a step portion with a large diameter on the side opposite to the main valve seat side. The main valve,
Since the annular space portion provided between the cages in communication with the upstream pipeline is communicated by the through hole formed in the main valve, the pressure of the upstream pipeline is applied to both annular spaces when the valve is closed. As a result, the closing performance of the valve is improved. When opening the small valve, when the small valve opens, the static pressure due to the pressure in the upstream pipe acts as an upward force on the small valve, fixing it to the main valve side and integrating it, and Since the upper and lower sides of the valve have the same pressure and the axial thrust becomes smaller, the valve shaft driving force becomes smaller and the actuator capacity can be reduced, and due to the unsteady gap flow between the cage and the main valve as in the past. Vibration and resonance phenomena due to the jet flow and the elastic force of the spring are eliminated, and the valve opening is stabilized.
第１図ないし第４図は本考案に係る弁装置の実施例を示
し、第１図は全閉状態で示す弁装置の縦断面図、第２図
は小弁の開放状態で示す弁装置の縦断面図、第３図は主
弁の開放状態で示す弁装置の縦断面図、第４図は本考案
の他の実施例を第１図に対応して全閉状態で示す弁装置
の縦断面図、第５図は従来の弁装置の縦断面図である。 20……ケージ、20a……孔、20b……主弁座、21b,21d、2
4e,24f……通孔、21……主弁、21a……小弁座、22……
バックシート、23,25,27,28……環状空間部、24……小
弁、24a……上側小径部、24b……大径部、24c……下側
小径部、24d……貫通孔。1 to 4 show an embodiment of a valve device according to the present invention. FIG. 1 is a longitudinal sectional view of the valve device shown in a fully closed state, and FIG. 2 is a valve device shown in an opened state of a small valve. FIG. 3 is a vertical sectional view of the valve device shown in the opened state of the main valve, and FIG. 4 is a vertical sectional view of the valve device shown in a fully closed state corresponding to FIG. 1 of another embodiment of the present invention. FIG. 5 is a vertical sectional view of a conventional valve device. 20 …… cage, 20a …… hole, 20b …… main valve seat, 21b, 21d, 2
4e, 24f …… through hole, 21 …… main valve, 21a …… small valve seat, 22 ……
Back seat, 23,25,27,28 …… annular space part, 24 …… small valve, 24a …… upper small diameter part, 24b …… large diameter part, 24c …… lower small diameter part, 24d …… through hole.
Claims (1)
この主弁座に着座部を臨ませケージの内孔に軸方向に進
退自在に嵌合された円筒状の主弁と、この主弁の内孔端
部に形成された小弁座と、この小弁座に着座部を臨ませ
前記主弁の内孔に軸方向に進退自在に嵌合された小弁と
を備え、この小弁を開くことにより前記主弁の軸方向両
側の室を連通させるように構成されている弁装置におい
て、 前記小弁の前記主弁との嵌合部に反主弁座側が大径の段
差部を設けるとともに、この大径の段差部に軸方向で対
向するように前記主弁の内孔内で反主弁座側が大径の段
差部を設け、かつこれらの段差部間で前記小弁の外周部
と主弁の内孔内周部とによって囲まれた環状空間部と、
前記主弁、ケージ間に上流側管路に連通させて設けた環
状空間部とを、主弁に形成した通孔によって連通させた
ことを特徴とする弁装置。1. A main valve seat formed at an end of an inner hole of a cage,
A cylindrical main valve that is seated on the main valve seat and is fitted in the inner hole of the cage so as to be able to move forward and backward in the axial direction, and a small valve seat formed at the end of the inner hole of the main valve. A small valve seated on the small valve seat and fitted in the inner hole of the main valve so as to move back and forth in the axial direction; and by opening the small valve, the chambers on both axial sides of the main valve communicate with each other. In the valve device configured to perform, the anti-main valve seat side is provided with a step portion having a large diameter at the fitting portion of the small valve with the main valve, and the step portion having the large diameter is axially opposed to the step portion. As described above, a step portion having a large diameter is provided on the side opposite to the main valve seat side in the inner hole of the main valve, and the step portion is surrounded by the outer peripheral portion of the small valve and the inner peripheral portion of the inner hole of the main valve. An annular space part,
A valve device characterized in that the main valve and an annular space portion provided between the cage and the upstream side pipe line are communicated with each other through a through hole formed in the main valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988134501U JPH0740776Y2 (en) | 1988-10-17 | 1988-10-17 | Valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988134501U JPH0740776Y2 (en) | 1988-10-17 | 1988-10-17 | Valve device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0254975U JPH0254975U (en) | 1990-04-20 |
| JPH0740776Y2 true JPH0740776Y2 (en) | 1995-09-20 |
Family
ID=31393314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988134501U Expired - Fee Related JPH0740776Y2 (en) | 1988-10-17 | 1988-10-17 | Valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0740776Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101667593B1 (en) * | 2015-04-10 | 2016-10-20 | 주식회사 코밸 | A control valve for cryogenic high pressure gas which having reinforced sealing member |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101513088B1 (en) * | 2014-04-15 | 2015-04-21 | 주식회사 코밸 | A control valve for cryogenic high pressure gas which having double plug structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5141247Y2 (en) * | 1971-09-14 | 1976-10-07 | ||
| JPS62172864U (en) * | 1986-04-24 | 1987-11-02 |
-
1988
- 1988-10-17 JP JP1988134501U patent/JPH0740776Y2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101667593B1 (en) * | 2015-04-10 | 2016-10-20 | 주식회사 코밸 | A control valve for cryogenic high pressure gas which having reinforced sealing member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0254975U (en) | 1990-04-20 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |