JPS5858542B2 - Netsuroudoshikibunkiriyuurokaihaben - Google Patents
NetsuroudoshikibunkiriyuurokaihabenInfo
- Publication number
- JPS5858542B2 JPS5858542B2 JP49104315A JP10431574A JPS5858542B2 JP S5858542 B2 JPS5858542 B2 JP S5858542B2 JP 49104315 A JP49104315 A JP 49104315A JP 10431574 A JP10431574 A JP 10431574A JP S5858542 B2 JPS5858542 B2 JP S5858542B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- flow path
- seat surface
- expansion
- 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
Landscapes
- Temperature-Responsive Valves (AREA)
- Multiple-Way Valves (AREA)
Description
【発明の詳細な説明】
この発明は、自動車エンジンとラジェータとの間の冷却
水循環路あるいはその他の液体通路または液槽等に設置
されて温度変化にエリ自動的に開閉される熱応動式分岐
流路開閉弁に関するものである。Detailed Description of the Invention The present invention provides a thermally responsive branch flow system that is installed in a cooling water circulation path or other liquid path or liquid tank between an automobile engine and a radiator, and that automatically opens and closes in response to temperature changes. This relates to road opening/closing valves.
次にこの発明を図示の例によって詳細に説明する。Next, the present invention will be explained in detail using illustrated examples.
第1図ないし第5図はこの発明の一実施例を示すもので
あって、弁筺本体7の一端部耘よび他端部に保持頭部8
釦よび蓋9が螺合連結されて弁筺3が構成され、その保
持頭部8の中心部には、公知のワックス式熱応動伸縮装
置1にかけるケース2が固定され、かつ前記弁筺本体1
には、中央流路4とその両端部に連らなる第1弁室10
j、−よび第2弁室11とが設けられ、さらに弁筺本体
7には、中央流路4の中間部に開口する主流路5と、第
1弁室10にかける環状の平坦な弁座面12に開口する
多数の分岐流路13A〜13Hと、第2弁室11に釦け
る環状の平坦な弁座面14に開口する多数の分岐流路1
5A〜15Hとが設けられ、各弁座面12,14に釦け
る分岐流路13A〜13H,15A〜15Hの開口部は
弁座面12゜14と共通の中心を有する円周上に釦いて
等間隔で配置されている。1 to 5 show an embodiment of the present invention, in which a holding head 8 is provided at one end of the valve housing body 7 and at the other end.
A button and a lid 9 are screwed together to form a valve housing 3, and a case 2 for hanging a known wax-type thermally responsive expansion/contraction device 1 is fixed to the center of a holding head 8 of the valve housing 3. 1
, there is a central flow path 4 and a first valve chamber 10 connected to both ends thereof.
j, - and a second valve chamber 11 are provided, and the valve housing body 7 is further provided with a main flow passage 5 opening in the middle part of the central flow passage 4 and an annular flat valve seat extending over the first valve chamber 10. A large number of branch channels 13A to 13H open to the surface 12 and a large number of branch channels 1 that open to the annular flat valve seat surface 14 buttoned to the second valve chamber 11.
5A to 15H are provided, and the openings of the branch channels 13A to 13H and 15A to 15H buttoned on each valve seat surface 12 and 14 are buttoned on the circumference having a common center with the valve seat surface 12 and 14. They are placed at equal intervals.
第1弁室10および第2弁室11には、金属または硬質
プラスチック製弁本体16とその弁面に嵌合固着された
ゴム製環体17とからなる第1弁体18および第2弁体
19が収容され、かつ熱応動伸縮装置1における伸縮部
材6は第1弁体18の中心部に摺動自在に嵌挿さへその
伸縮部材6の先端側にはスナップリ、ングからなるスト
ッパ20が固定され、第1弁体18と前記ケース2との
間に釦いて伸縮部材6に嵌合係止されたばね受部材21
からなるばね受部と、前記第1弁体18との間には、弁
体押圧用ばね22が圧縮状態で介在され、そのはね22
の弾力により第1弁体18がストッパ20に押付けられ
ている。The first valve chamber 10 and the second valve chamber 11 are provided with a first valve body 18 and a second valve body consisting of a valve body 16 made of metal or hard plastic and a rubber ring body 17 that is fitted and fixed to the valve surface of the valve body 16. 19 is accommodated, and the telescopic member 6 in the thermally responsive telescopic device 1 is slidably inserted into the center of the first valve body 18. A stopper 20 consisting of a snap ring is fixed to the distal end side of the telescopic member 6. A spring receiving member 21 is buttoned between the first valve body 18 and the case 2 and is fitted and locked to the telescopic member 6.
A valve pressing spring 22 is interposed in a compressed state between the spring receiving portion and the first valve body 18.
The first valve body 18 is pressed against the stopper 20 by the elasticity of the first valve body 18 .
前記はね受部材21と弁筺本体7の段部との間には、伸
縮部材6を押戻すように働ら〈戻しばね23が圧縮状態
で介在され、かつ第2弁体19と蓋9との間には、第2
弁体19を閉塞方向に押圧する閉塞用はね24が圧縮状
態で介在され、さらに前記保持頭部8には、開閉弁を流
体管路25または液体槽に螺合固定するための取付用雄
ねじ部26が設けられている。A return spring 23 is interposed in a compressed state between the spring receiving member 21 and the stepped portion of the valve housing body 7, and acts to push back the elastic member 6. There is a second
A closing spring 24 that presses the valve body 19 in the closing direction is interposed in a compressed state, and the holding head 8 has a mounting male screw for screwing and fixing the on-off valve to the fluid pipe line 25 or the liquid tank. A section 26 is provided.
前記主流路5は例えば自動車のマニホールドや空気圧源
または負圧源あるいは液圧源等に接続され、さらに第1
弁体18に対応する分岐流路13A〜13H1d例えば
ディストリビュータおよび触媒装置ならびに他の各種の
機器における制御部に接続され、唸た第2弁体19に対
応する分岐流路15A〜15Hはエアクリーナおよび他
の各種の機器にトける制御部に接続される。The main flow path 5 is connected to, for example, a manifold of an automobile, an air pressure source, a negative pressure source, a liquid pressure source, etc.
Branch flow paths 13A to 13H1d corresponding to the valve body 18 are connected to, for example, a distributor, a catalyst device, and a control unit in various other devices, and branch flow paths 15A to 15H corresponding to the second valve body 19 are connected to an air cleaner and other devices. It is connected to the control section of various devices.
熱応動伸縮装置1に訃けるケース2の周囲の液温か一定
以下であるときは、伸縮部材6が短縮位置に置かれてい
るので、第1図に示すように、第1弁体18が開放位置
に置かれると共に第2弁体19が閉塞位置に置かれてい
る。When the temperature of the liquid around the case 2, which causes the thermally responsive expansion and contraction device 1, is below a certain level, the expansion and contraction member 6 is placed in the shortened position, so the first valve body 18 is opened as shown in FIG. position, and the second valve body 19 is also placed in the closed position.
次にケース2の周囲の液温か所定温度援で上昇すると、
ケース2内のワックスが固体から液体に変化するときの
急激な体積膨張により伸縮部材6が急速に伸長されるの
で、その伸縮部材6により戻しばね23が圧縮されると
共に弁体押圧用はね22を介して第1弁体18が抑圧移
動されて弁座面12に押付けられ、したがって第1弁体
18によりこれに対応する各分岐流路13A〜13Hが
同時に閉じられる。Next, when the temperature of the liquid around case 2 rises with a predetermined temperature support,
When the wax in the case 2 changes from solid to liquid, the expansion and contraction member 6 is rapidly expanded due to the rapid volume expansion, so the expansion and contraction member 6 compresses the return spring 23 and the valve body pressing spring 22. The first valve body 18 is suppressed and pressed against the valve seat surface 12 through the first valve body 18, and therefore the corresponding branch passages 13A to 13H are simultaneously closed by the first valve body 18.
前記ケース2の周囲の液温かさらに上昇すると、伸縮部
材6は前記各ばね22,23を圧縮しながら伸長するの
で、その伸縮部材6により閉塞用はね24の弾力に抗し
て第2弁体19が開放方向に移動され、したがって第2
弁体19に対応する各分岐流路15A〜15Hが同時に
開かれて、各分岐流路15A〜15Hと主流路5とが接
続され、第2図に示す状態になる。When the temperature of the liquid around the case 2 further increases, the elastic member 6 expands while compressing the springs 22 and 23, so that the elastic member 6 resists the elasticity of the closing spring 24 and closes the second valve body. 19 is moved in the opening direction, thus the second
The branch channels 15A to 15H corresponding to the valve body 19 are simultaneously opened, and the branch channels 15A to 15H are connected to the main channel 5, resulting in the state shown in FIG. 2.
次に前記ケース2の周囲の液温か降下していくと、戻し
ばね23および閉塞用ばね24ならびに弁体押圧用ばね
22の弾力により伸縮部材6が短縮移動されると共に第
2弁体19が弁座面14に圧着されるので第2弁体19
に対応する各分岐流路15A〜15Hが閉じられる。Next, when the temperature of the liquid around the case 2 decreases, the elasticity of the return spring 23, the closing spring 24, and the valve pressing spring 22 causes the telescopic member 6 to be shortened and moved, and the second valve body 19 is moved toward the valve. The second valve body 19 is crimped onto the seat surface 14.
Each branch channel 15A-15H corresponding to is closed.
またケース2の周囲の液温かさらに降下していくと、戻
しばね23の弾力により伸縮部材6が短縮方向に押圧移
動されると共に伸縮部材6によりストッパ20を介して
第1弁体18が開放方向に移動され、したがって第1弁
体18に対応する各分岐流路13A〜13Hが開放され
て主流路5と接続され、第1図に示す状態に復帰する。Further, as the liquid temperature around the case 2 further decreases, the elasticity of the return spring 23 presses and moves the telescopic member 6 in the shortening direction, and the telescopic member 6 moves the first valve body 18 in the opening direction via the stopper 20. Therefore, each branch flow path 13A to 13H corresponding to the first valve body 18 is opened and connected to the main flow path 5, and the state shown in FIG. 1 is restored.
なお1つの弁座面に開口される分岐流路は2本以上任意
数設けられていてもよい。Note that an arbitrary number of two or more branch channels may be provided that are opened on one valve seat surface.
第6回転よび第7図は前記第1弁体18むよび第2弁体
19の第1変形例を示すものであって、弁体に訃けるゴ
ム製環体17に、各分岐流路13A〜13H,15A〜
15Hの開口端部にわたって延長する環状溝27が設け
られている。The sixth rotation and FIG. 7 show a first modification of the first valve body 18 and the second valve body 19, in which a rubber ring 17 attached to the valve body is provided with each branch flow path 13A. ~13H, 15A~
An annular groove 27 is provided extending over the open end of 15H.
この型式の弁体を使用すれば、弁体が閉じられると、各
分岐流路13A〜13H寸たは15A〜15Hと主流路
5とは遮断されるが、同一弁座に開口する各分岐流路は
環状溝27を介して接続される。If this type of valve body is used, when the valve body is closed, each branch flow path 13A to 13H or 15A to 15H and the main flow path 5 are cut off, but each branch flow opening to the same valve seat is The channels are connected via an annular groove 27.
第8図むよび第9図は前記第1弁体18および第2弁体
19の第2変形例を示すものであって、弁体にむけるゴ
ム製環体17に、複数の分岐流路にわたって延長する円
弧状溝28および29が設けられ、かつ弁体は弁筺に対
し摺動自在にかつ回動不能に嵌合されている。FIG. 8 and FIG. 9 show a second modification of the first valve body 18 and the second valve body 19, in which a rubber ring body 17 facing the valve body has a plurality of branch channels. Extending arcuate grooves 28 and 29 are provided, and the valve body is slidably and non-rotatably fitted in the valve housing.
この型式の弁体を使用すれば、弁体が閉じられると各分
岐流路13A〜13Hまたは15A〜15Hと主流路5
とは遮断されるが、分岐流路13A 、15Aむよび1
3H815Hは円弧状溝28を介して接続され、かつ分
岐流路13C、15C釦よび13D 、 15Dは円弧
状溝29を介して接続される。If this type of valve body is used, when the valve body is closed, each branch flow path 13A to 13H or 15A to 15H and the main flow path 5
However, branch channels 13A, 15A and 1
3H815H are connected via an arcuate groove 28, and the branch channels 13C, 15C buttons and 13D, 15D are connected via an arcuate groove 29.
この発明は前述のように構成されているので、熱応動伸
縮装置1が温度上昇により伸長していくと、第1弁体1
8が閉弁方向に移動されて、第1弁室10の弁座面12
に開口する複数の分岐流路が中央流路4に対し同時に遮
断され、続いて前記熱応動伸縮装置1が伸長していくと
、第2弁体19が開弁方向に移動されて、第2弁室11
の弁座面14に開口する複数の分岐流路が中央流路4に
対し同時に連通され、次に熱応動伸縮装置1が温度降下
により短縮していくと、第2弁体19が閉弁方向に移動
されて、第2弁室11の弁座面14に開口する複数の分
岐流路が中央流路4に対し同時に遮断され、続いて熱応
動伸縮装置1が短縮していくと、第1弁体18が開弁方
向に移動されて、第1弁室10の弁座面12に開口する
複数の分岐流路が中央流路4に連通され、したがって、
1つの熱応動伸縮装置1を利用し、かつ簡単な開閉機構
により、第1弁体18および第2弁体19に特別な分岐
流路開閉動作を行なわせることができる。Since this invention is configured as described above, when the thermally responsive expansion/contraction device 1 expands due to a rise in temperature, the first valve body 1
8 is moved in the valve closing direction, and the valve seat surface 12 of the first valve chamber 10
When a plurality of branch channels opening to the central channel 4 are simultaneously blocked off from the central channel 4 and the thermally responsive expansion/contraction device 1 expands, the second valve body 19 is moved in the valve opening direction, and the second valve body 19 is moved in the valve opening direction. Valve chamber 11
A plurality of branch channels opening on the valve seat surface 14 are simultaneously communicated with the central channel 4, and then when the thermally responsive expansion/contraction device 1 shortens due to a drop in temperature, the second valve body 19 moves in the valve closing direction. , the plurality of branch passages opening to the valve seat surface 14 of the second valve chamber 11 are simultaneously blocked from the central passage 4, and subsequently, when the thermally responsive expansion and contraction device 1 is shortened, the first The valve body 18 is moved in the valve opening direction, and the plurality of branch channels that open to the valve seat surface 12 of the first valve chamber 10 are communicated with the central channel 4, and therefore,
Using one thermally responsive expansion/contraction device 1 and a simple opening/closing mechanism, it is possible to cause the first valve body 18 and the second valve body 19 to perform special branch flow path opening/closing operations.
また熱応動伸縮装置1における伸縮部材6に第1弁体1
8を固定した場合は、第1弁体18が弁座面に接触した
のち熱応動伸縮装置1にむけるケース2の周囲の温度が
上昇していくと、伸縮部材6の伸長動作が第1弁体18
により阻止されるので、熱応動伸縮装置に過大な応力が
発生してこれが破損する恐れがあるが、この発明の場合
は、第1弁体18が伸縮部材6に摺動可能に嵌設される
と共に、第1弁体18およびケース2の間において伸縮
部材6に設けられたばね受部と、第1弁体18との間に
、弁体押圧用はね22が介在されているので、第1弁体
が弁座面に押付けられたのちもさらに温度上昇した場合
は、前記伸縮部材6が弁体押圧用ばね22を圧縮しなが
ら伸長して行き、そのため弁座面に対する第1弁体の圧
接力が増大していくので、高温時の密閉性を著しく向上
させることができると共に、伸縮部材6の伸長動作が阻
止されることばないので、熱応動伸縮装置の破損を防止
することができる等の効果が得られる。In addition, the first valve body 1 is attached to the expandable member 6 in the thermally responsive expandable device 1.
8 is fixed, as the temperature around the case 2 toward the thermally responsive expansion/contraction device 1 rises after the first valve element 18 contacts the valve seat surface, the expansion operation of the expansion/contraction member 6 changes to the first valve seat surface. body 18
However, in the case of the present invention, the first valve body 18 is slidably fitted into the expandable member 6. In addition, since the spring 22 for pressing the valve body is interposed between the first valve body 18 and the spring receiving portion provided on the telescopic member 6 between the first valve body 18 and the case 2, the first valve body If the temperature rises even after the valve body is pressed against the valve seat surface, the telescopic member 6 expands while compressing the valve body pressing spring 22, so that the first valve body is pressed against the valve seat surface. Since the force increases, the sealing performance at high temperatures can be significantly improved, and since the expansion operation of the expansion and contraction member 6 is not blocked, damage to the thermally responsive expansion and contraction device can be prevented, etc. Effects can be obtained.
図面はこの発明の実施例を示すものであって、第1図は
第1弁体が開放されると共に第2弁体が閉塞されている
状態を示す縦断側面図、第2図は第1弁体が閉塞される
と共に第2弁体が開放されている状態を示す縦断側面図
、第3図は分岐流路の配置を示す断面図、第4図は弁体
お−よび弁座を示す縦断側面図、第5図はそのA−A線
断面図である。
第6図は弁体の第1変形例を示す縦断側面図、第7図は
そのB−B線断面図、第8図は弁体の第2変形例を示す
縦断側面図、第9図はそのCC線断面図である。
図に訃いて、1は熱応動伸縮装置、2はケース、3は弁
筺、4は中央流路、5は主流路、6は伸縮部材、12は
弁座面、13A〜13Hu分岐流路、14は弁座面、1
5A〜15Hは分岐流路、18は第1弁体、19は第2
弁体、22は弁体押圧用ばね、23は戻しばね、24は
閉塞用ばねである。The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal side view showing a state in which the first valve body is opened and the second valve body is closed, and FIG. FIG. 3 is a cross-sectional view showing the arrangement of the branch flow path, and FIG. 4 is a longitudinal cross-sectional view showing the valve body and the valve seat. The side view and FIG. 5 are sectional views taken along line A-A. FIG. 6 is a longitudinal sectional side view showing a first modification of the valve body, FIG. 7 is a sectional view taken along the line B-B, FIG. 8 is a longitudinal sectional side view showing a second modification of the valve disc, and FIG. It is a sectional view taken along the line CC. In the figure, 1 is a thermally responsive expansion and contraction device, 2 is a case, 3 is a valve housing, 4 is a central flow path, 5 is a main flow path, 6 is an expansion and contraction member, 12 is a valve seat surface, 13A to 13 Hu branch flow paths, 14 is the valve seat surface, 1
5A to 15H are branch flow paths, 18 is a first valve body, and 19 is a second valve body.
22 is a spring for pressing the valve body, 23 is a return spring, and 24 is a closing spring.
Claims (1)
主流路5に中間部が接続されている中央流路4と、その
中央流路4の両端部に連らなる第1弁室10および第2
弁室11と、その第1弁室10における環状の平坦な弁
座面12に開口する複数の分岐流路と、第2弁室11に
訃ける環状の平坦な弁座面14に開口する複数の分岐流
路とが設けられ、前記熱応動伸縮装置1の伸縮部材6は
第1弁室10釦よび中央流路4にわたって延長すると共
に前記弁座面12に対し直角に配置され、前記伸縮部材
6にはその弁座面12に開口する各分岐流路を開閉する
共通の第1弁体18が摺動可能に嵌設され、第1弁体1
8およびケース2の間において伸縮部材6に設けられた
ばね受部と第1弁体18との間に弁体押圧用はね22が
介在され、第2弁室11の弁座面14に開口する各分岐
流路を開閉する共通の第2弁体19には閉塞用ばね24
が係合され、前記伸縮部材6の先端部が第2弁体19に
対向していることを特徴とする熱応動式分岐流路開閉弁
。1 Into the valve housing 3 to which the case 2 of the thermally responsive expansion/contraction device 1 is fixed,
A central flow path 4 whose intermediate portion is connected to the main flow path 5, and a first valve chamber 10 and a second valve chamber connected to both ends of the central flow path 4.
A valve chamber 11 , a plurality of branch passages opening into an annular flat valve seat surface 12 in the first valve chamber 10 , and a plurality of branch passages opening into an annular flat valve seat surface 14 in the second valve chamber 11 . The expansion and contraction member 6 of the thermally responsive expansion and contraction device 1 extends across the first valve chamber 10 button and the central flow path 4 and is arranged at right angles to the valve seat surface 12. A common first valve body 18 that opens and closes each branch flow path opening on the valve seat surface 12 is slidably fitted in the first valve body 6 .
A valve pressing spring 22 is interposed between the first valve body 18 and a spring receiving portion provided on the telescopic member 6 between the first valve body 18 and the first valve body 18 and opens into the valve seat surface 14 of the second valve chamber 11. A closing spring 24 is provided in the common second valve body 19 that opens and closes each branch flow path.
are engaged with each other, and the distal end portion of the telescopic member 6 faces the second valve body 19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49104315A JPS5858542B2 (en) | 1974-09-12 | 1974-09-12 | Netsuroudoshikibunkiriyuurokaihaben |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49104315A JPS5858542B2 (en) | 1974-09-12 | 1974-09-12 | Netsuroudoshikibunkiriyuurokaihaben |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5131927A JPS5131927A (en) | 1976-03-18 |
| JPS5858542B2 true JPS5858542B2 (en) | 1983-12-26 |
Family
ID=14377489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP49104315A Expired JPS5858542B2 (en) | 1974-09-12 | 1974-09-12 | Netsuroudoshikibunkiriyuurokaihaben |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858542B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830310A (en) * | 1971-08-20 | 1973-04-21 | ||
| JPS62242306A (en) * | 1986-04-14 | 1987-10-22 | 松下電器産業株式会社 | Voltage nonlinear element |
| JPS62196978U (en) * | 1986-06-04 | 1987-12-15 | ||
| JP5375728B2 (en) * | 2010-04-14 | 2013-12-25 | パナソニック株式会社 | Water heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1234474A (en) * | 1968-07-22 | 1971-06-03 | ||
| JPS4956336U (en) * | 1972-08-29 | 1974-05-18 |
-
1974
- 1974-09-12 JP JP49104315A patent/JPS5858542B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5131927A (en) | 1976-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4068800A (en) | Thermally responsive valve assembly | |
| US4036433A (en) | Thermally operated control device and method of making the same | |
| US20010002646A1 (en) | Multifunction rocker switch | |
| US5018664A (en) | Thermostat having soft mounting structure | |
| MX2008003804A (en) | Engine thermostat having bypass pressure-dampening fluid passage. | |
| US3214134A (en) | Balanced fluid valve | |
| US4373666A (en) | Engine cooling-passenger heating system | |
| US4026464A (en) | Dual function thermal valve | |
| US3136337A (en) | Thermostatically operated diversion valve for engine cooling system | |
| US4117976A (en) | Multi-function thermostatic valve | |
| US4133478A (en) | Temperature responsive valve | |
| US5961037A (en) | Engine coolant thermostat with overtemperature protection | |
| US3381469A (en) | Multi-range thermal element | |
| US3515368A (en) | Thermally responsive on and off vacuum control valve | |
| US4032071A (en) | Thermally responsive valve having dual operating temperatures | |
| US2925986A (en) | Pressure operated valve | |
| US2770440A (en) | Pilot-controlled hydraulic valve | |
| US3006552A (en) | Thermostatically actuated valve for regulating vacuum connections | |
| US4681256A (en) | Thermostatic steam traps | |
| US4347975A (en) | Bimetallic-controlled steam trap | |
| US2102656A (en) | Thermostatic device | |
| US2941404A (en) | Ambient-compensated actuator | |
| US4453780A (en) | Valve assemblies | |
| EP1304517B1 (en) | Thermostat and mounting structure of the thermostat | |
| US4142675A (en) | Three port thermal vacuum valve with electrical switch |