JP2003049958A - Opening and closing valve of connecting passage for differential pressure detector - Google Patents
Opening and closing valve of connecting passage for differential pressure detectorInfo
- Publication number
- JP2003049958A JP2003049958A JP2001235922A JP2001235922A JP2003049958A JP 2003049958 A JP2003049958 A JP 2003049958A JP 2001235922 A JP2001235922 A JP 2001235922A JP 2001235922 A JP2001235922 A JP 2001235922A JP 2003049958 A JP2003049958 A JP 2003049958A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pressure side
- low
- connecting passage
- cock body
- 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.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は流体の差圧から流量
や流速あるいは液位を計測するための差圧検出器へ流体
の圧力を導く導圧路の開閉を行うための開閉弁に関す
る。
【０００２】
【従来の技術とその問題点】流体の差圧から流量や流速
あるいは液位を計測する装置には従来から各種のものが
あり、例えばピトー管による流速計や差圧流量計等があ
る。
【０００３】ピトー管による流速測定の場合、流路管内
を流れる流体の総圧と静圧を差圧計に導き、総圧と静圧
の差すなわち動圧から流速を測定するものとしてある。
【０００４】また、差圧流量計は、流路管内に設けたオ
リフィスの上流側と下流側における各流体圧力を差圧計
に導き、これら上流側と下流側の圧力の差から流量を測
定するものとしてある。
【０００５】上述した差圧による流速あるいは流量の測
定においては、差圧発生部すなわちピトー管やオリフィ
スから差圧計に圧力を導く２本の導圧路を備え、これら
導圧路の途中には三岐弁が両導圧路を跨ぐように設けら
れる。
【０００６】上記三岐弁は、高圧側（ピトー管では総圧
側、オリフィスでは上流側）と低圧側（ピトー管では静
圧側、オリフィスでは下流側）の各導圧路をそれぞれ個
別に開閉する２つのストップ弁と、両導圧路間を連通ま
たは閉止する均圧弁とを備える構成のものとしてあり、
流量や流速を測定する際には両ストップ弁を開くととも
に均圧弁を閉ざし、各導圧管にて差圧発生部からの圧力
が差圧計へ導かれるようにするが、非測定時には高圧側
と低圧側のストップ弁をともに閉ざし、均圧弁を開く。
【０００７】前記均圧弁は差圧検出器の高圧側と低圧側
を連通させて圧力を等しくし、差圧計のゼロ点調整を行
うための構成である。
【０００８】上述した三岐弁は、２つのストップ弁と均
圧弁の３つの弁を別々に操作しなければならず、しかも
これらの弁の開閉の順序が煩雑であり、また２つのスト
ップ弁は単に開閉操作を行えばよいのではなく、開閉の
スピードまで考慮しなければならず、操作が複雑であ
る。
【０００９】また、三岐弁は対応圧力範囲が広いという
メリットはあるが、機構が複雑であるため高価であると
いう実用上の欠点がある。
【００１０】
【目的】本発明の目的とするところは、操作が簡単であ
り、かつ構造も簡単で安価に製作することができる差圧
検出器用導圧路の開閉弁を提供することにある。
【００１１】
【本発明の構成】上記目的を達成するために、本発明に
係る差圧検出用導圧路の開閉弁は、弁箱内に高圧側圧力
導入口から同導出口に至る高圧側導圧路と低圧側圧力導
入口から同導出口に至る低圧側導圧路が並列に形成さ
れ、前記高圧側導圧路と低圧側導圧路を横断する円柱状
のコック体を軸まわりに回動可能に備え、このコック体
は通常はその側面によって前記高圧側導圧路と低圧側導
圧路をともに閉止しているが、コック体を或る角度位置
に回動せしめると前記高圧側導圧路と低圧側導圧路を連
通せしめる第１導通孔と第２導通孔を直径方向に並列に
有し、かつ、コック体を他の角度位置に回動せしめる
と、少なくとも高圧導出口側の高圧側導圧路と低圧導出
口側の低圧側導圧路とを連通せしめる均圧路を備えてな
る構成のものとしてある。
【００１２】
【実施例】以下、本発明に係る開閉弁の実施例を添付図
面に示す具体例に基づいて詳細に説明する。弁箱１には
高圧側圧力の導入口２ａ（以下、高圧導入口と称する）
と同導出口２ｂ（以下、高圧導出口と称する）を連通す
る高圧側導圧路２と、低圧側圧力の導入口３ａ（以下、
低圧導入口と称する）と同導出口３ｂ（以下、低圧導出
口と称する）を連通する低圧側導圧路３が平行に形成さ
れている。
【００１３】上記高圧導入口２ａは円環状の低圧導入口
３ａの中心部分に開口させられて高圧導入口と低圧導入
口は同心状に形成されていて、２重管よりなる導圧管を
接続できるようになっており、各導入口の内周面にはＯ
リング４ａ、４ｂを設けてある。
【００１４】また、低圧導入口は弁箱の上面と下面にそ
れぞれ連通する分岐通路５、６が設けられていて、上下
の分岐通路はそれぞれエア抜き用とドレン抜き用のもの
としてあり、通常は開口端が栓５ａ、６ａにてそれぞれ
閉止されている。
【００１５】しかして、弁箱１内には前記高圧側導圧路
２および低圧側導圧路３と直交して弁箱の前後に連通す
る横孔７が形成されていて、この横孔内に略円柱状のコ
ック体８をその軸まわりに回動可能に備えている。
【００１６】このコック体８には図５に示されるように
直径方向に２列の平行な第１導圧孔９と第２導圧孔１０
が形成されており、これら第１、第２の導圧孔は同一立
面上に形成され、ともにコック体の中心軸線に対して直
交するようにあけられている。
【００１７】また、コック体は上記第１、第２の導圧孔
とは別にこれら導圧孔よりも小径な均圧路１１を備えて
おり、この均圧路は少なくとも高圧側導圧路２の導出口
２ｂ側と、低圧側導圧路３の導出口３ｂ側を連通させる
ものとしてあり、本実施例のものでは高圧側導圧路２の
導入口２ａ側と同導出口２ｂ側および低圧側導圧路３の
導出口３ｂ側とを連通する構成としてある。
【００１８】具体的には均圧路１１を、第１導圧孔と同
じ円周上に開口する高圧側第１開口部１２ａからコック
体の中心軸線と交差してコック体の反対側において第２
導圧孔と同じ円周上に開口する低圧側開口部１２ｃに至
る直線状の主均圧路１１ａと、この主均圧路から分岐
し、第１導圧孔と同じ円周上の前記低圧側開口部１２ｃ
と同じ側に開口する高圧側第２開口部１２ｂに至る分岐
均圧路１１ｂとで構成してあり、上記３つの開口部１２
ａ、１２ｂ、１２ｃはコック体の中心軸を含む同一立面
上に形成されている。
【００１９】前記第１導圧孔９と第２導圧孔１０とを含
む立面と、均圧路１１を含む立面はコック体８の中心軸
線まわりに或る角度、例えば図５に示すように４５°の
角度をなすように形成してある。
【００２０】なお、図中の符号１３はコック体８を回動
せしめるためのハンドル、１４、１４は各導圧路とコッ
ク体８間をシールするＯリング、１５はＯリングを固定
するカラー、１６は横孔７とコック体間をシールするＯ
リングをそれぞれ示している。
【００２１】また、符号１７は閉止プラグを示し、この
閉止プラグは弁箱内の導圧孔を加工する際に切削用工具
を導入した孔を閉止するためのものであり、１８はドレ
ン抜きを示し、被測定流体が気体である場合には図１、
３、４のようにこのドレン抜きが下向きとなるように開
閉弁を取り付けて使用されるが、被測定流体が液体であ
る場合には上向きとなるようにして、ガス抜きとして使
用される。
【００２２】次ぎに、上述のように構成した本発明に係
る開閉弁の作用を図６乃至８に基づいて説明する。差圧
を検出する際には、ハンドル１３を操作してコック体を
或る角度、例えば図６に示されようにハンドルが両導圧
路と平行になる角度に位置させると前記第１導圧孔と第
２導圧孔がそれぞれ高圧側導圧路２と低圧側導圧路３を
連通せしめ、したがって、高圧側導入口２ａから同導出
口２ｂに至る高圧側導圧路２と、低圧側導入口３ａから
同導出口３ｂに至る低圧側導圧路３とがそれぞれ独立し
て連通される。
【００２３】導圧路２、３を閉止する場合には、ハンド
ル１３を操作してコック体を回動せしめ、例えば図７に
示されようにハンドルを図６に示した状態から９０°反
時計回り方向に回動せしめて両導圧路と直交する角度に
位置させると、高圧側導圧路２と低圧側導圧路３がコッ
ク体の側面によって同時に閉ざされる。
【００２４】また、再び導圧路を開成する場合にはハン
ドル１３を時計回り方向に９０°回動せしめて図６に示
される状態にコック体を位置させると、高圧側の導圧路
２と低圧側の導圧路３が同時に開成され、したがって差
圧計にも高圧側圧力と低圧側圧力が同時に掛かり、ハン
ドルをラフに操作しても差圧計に片圧が掛かって破損す
るようなおそれはまずない。
【００２５】差圧計のゼロ点調整やドレン抜き等を行う
場合など、差圧計の高圧側と低圧側の圧力を等しくする
場合には、前述のように導圧路を閉止した状態（図７に
示した状態）からハンドル１３を図８に示されるように
例えば反時計回り方向にさらに４５°回動せしめ、均圧
路１１によって高圧側導圧路２の導入口２ａ側と同導出
口２ｂ側および低圧側導圧路３の導出口３ｂ側を連通せ
しめる。
【００２６】かくすると、差圧計の高圧側と低圧側の圧
力がともに高圧側導圧路２内の圧力と等しくなり、した
がって差圧計に掛かる圧力差はゼロとなってゼロ点調整
を行うことができる状態となる。
【００２７】ゼロ点調整を終えたら、ハンドル１３を操
作してコック体８を時計回り方向に例えば４５°回動せ
しめて図７のように高圧側導圧路２と低圧側導圧路３が
どちらも閉止された状態とするか、さらにコック体を時
計回り方向に９０°回動せしめて図６のように第１およ
び第２導通孔９、１０によって高圧側導圧路２と低圧側
導圧路３をそれぞれ連通せしめ、差圧を計測できる状態
とする。
【００２８】次ぎに、本発明に係る開閉弁の使用状態の
一例を図９に示すピトー管によって流体の流速を測定す
る場合の具体例に基づいて説明する。図において、符号
１９は被測定流体の流路管、２０はピトー管、２１は本
発明に係る開閉弁、２２は差圧検出器たる差圧計をそれ
ぞれ示している。
【００２９】前記ピトー管２０の総圧管２０ａは先端が
流路管１９の側面にあけられた取付孔１９ａから流路管
内に臨み、基端が開閉弁２１の高圧導入口２ａに接続さ
れ、また、ピトー管の静圧口２０ｂの先端は前記取り付
け孔１９ａに接続され、基端が開閉弁２１の低圧導入口
３ａに接続されている。
【００３０】また、開閉弁２１の高圧導出口２ｂおよび
低圧導出口３ｂはそれぞれ差圧計２２の高圧側入口と低
圧側入口に接続されており、この差圧計２２にて差圧が
検出され、この差圧に基づいて流速が出力されるように
なっている。上記差圧計には従来から各種の構造のもの
が公知であるので、詳細な説明は省略する。
【００３１】しかして、前述したようにハンドル１３の
操作によりコック体を回動せしめて図６に示されるよう
に第１および第２導通孔９、１０により高圧側導圧路２
と低圧側導圧路３をともに開成すると、流路管１９内の
総圧は前記ピトー管の総圧管２０ａ、開閉弁の高圧側導
圧路２を経て差圧計２１に導かれ、一方、流路管内の静
圧はピトー管の静圧口２０ｂから開閉弁の低圧側導圧路
３を経て差圧計２２に導かれ、この差圧計において例え
ばダイヤフラム機構により総圧と静圧との間の差圧すな
わち動圧が検出され、この差圧（動圧）に基づいて流速
値が針指示やデジタル表示あるいはデジタル信号等によ
り出力される。
【００３２】上述した実施例における均圧路１１は、高
圧側導圧路２の導出口２ｂ側と低圧側導圧路３の導出口
３ｂ側を、高圧側導圧路の導入口２ａ側と連通せしめる
構成のものとしてあるが、差圧計のゼロ点調整等を行う
には両導圧路の導出口側圧力を等しくすれば事が足りる
ので、これら導出口側を高圧側導圧路の導入口２ａ側と
は連通させない場合もあるし、高圧側導圧路の導入口側
に代えて低圧側導圧路の導入口３ａ側と連通させる場合
もある。
【００３３】
【発明の効果】本発明に係る開閉弁は上述した構成のも
のとしてあるので、コック体のハンドルを操作すること
によって高圧側導圧路と低圧側導圧路の開閉を同時に行
うことができる。
【００３４】したがって、差圧検出器へ高圧側圧力と低
圧側圧力が同時に導かれ、差圧検出器に片圧が掛かって
破損するようなおそれはまずなく、従来の三岐弁のよう
に開閉時における複雑な操作を行うことなく簡単に開閉
操作を行うことができる。
【００３５】また、コック体に均圧路を設けてあるの
で、均圧操作用の個別の弁等を設ける必要がなく、コッ
ク体のハンドルを操作することによって高圧側導圧路と
低圧側導圧路の各導出口側の圧力すなわち差圧計の高圧
側と低圧側の圧力を等しくすることができ、差圧検出器
のゼロ点調整やドレン抜きあるいはガス抜き等のメンテ
ナンスを容易に行うことができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure guiding path for guiding a fluid pressure from a fluid differential pressure to a differential pressure detector for measuring a flow rate, a flow velocity or a liquid level. The present invention relates to an on-off valve for opening and closing. 2. Description of the Related Art Conventionally, there are various types of devices for measuring a flow rate, a flow rate or a liquid level from a differential pressure of a fluid, such as a pitot tube flowmeter and a differential pressure flowmeter. is there. [0003] In the case of flow velocity measurement using a pitot tube, the total pressure and the static pressure of the fluid flowing in the flow path pipe are led to a differential pressure gauge, and the flow velocity is measured from the difference between the total pressure and the static pressure, that is, the dynamic pressure. Further, the differential pressure flow meter guides each fluid pressure upstream and downstream of an orifice provided in a flow path pipe to a differential pressure gauge, and measures a flow rate based on a difference between the upstream pressure and the downstream pressure. There is. In the measurement of the flow velocity or the flow rate by the above-mentioned differential pressure, there are provided two pressure passages for guiding the pressure from a pressure difference generating section, that is, a pitot tube or an orifice, to the differential pressure gauge. A branch valve is provided so as to straddle both pressure passages. The above-mentioned three-way valve individually opens and closes each pressure passage on the high pressure side (total pressure side in the pitot tube, upstream in the orifice) and each low pressure side (static pressure side in the pitot tube, downstream in the orifice). One stop valve and a pressure equalizing valve that communicates or closes between the two pressure introducing paths,
When measuring the flow rate or flow velocity, open both stop valves and close the equalizing valve so that the pressure from the differential pressure generating section is guided to the differential pressure gauge by each impulse line. Close both stop valves and open the pressure equalizing valve. [0007] The pressure equalizing valve is configured to communicate the high pressure side and the low pressure side of the differential pressure detector to equalize the pressure and adjust the zero point of the differential pressure gauge. In the above-mentioned three-way valve, the three valves of the two stop valves and the pressure equalizing valve must be operated separately, and the opening and closing sequence of these valves is complicated. Rather than simply performing the opening / closing operation, it is necessary to consider the opening / closing speed, and the operation is complicated. Although the three-way valve has the advantage of having a wide pressure range, it has a practical disadvantage of being expensive due to its complicated mechanism. SUMMARY OF THE INVENTION An object of the present invention is to provide an on-off valve of a pressure guiding path for a differential pressure detector which can be easily operated, has a simple structure and can be manufactured at low cost. In order to achieve the above object, an on-off valve for a differential pressure detecting impulse passage according to the present invention is provided in a valve box, on a high pressure side from a high pressure side pressure inlet to the same outlet. A low-pressure side impulse line from the low-pressure side pressure inlet to the low-pressure side pressure inlet is formed in parallel, and a cylindrical cock body crossing the high-pressure side and the low-pressure side impulse is formed around an axis. The cock body normally closes both the high-pressure side impulse line and the low-pressure side impulse line by its side, but when the cock body is turned to a certain angle position, the high-pressure side impulse is closed. When the pressure passage and the low pressure side pressure passage have a first conduction hole and a second conduction hole arranged in parallel in the diametric direction, and the cock body is rotated to another angular position, at least the high pressure outlet side And a pressure equalizing path for communicating the high-pressure side impulse line with the low-pressure side impulse line on the low-pressure outlet side. There are things. An embodiment of an on-off valve according to the present invention will be described below in detail with reference to the accompanying drawings. The valve box 1 has a high pressure side pressure inlet 2a (hereinafter, referred to as a high pressure inlet).
And a high-pressure side impulse passage 2 communicating with the outlet 2b (hereinafter, referred to as a high-pressure outlet), and an inlet 3a for low-pressure side (hereinafter, referred to as a high-pressure outlet).
A low-pressure side pressure passage 3 communicating with the low-pressure inlet and the outlet 3b (hereinafter referred to as a low-pressure outlet) is formed in parallel. The high-pressure inlet 2a is opened at the center of the annular low-pressure inlet 3a, and the high-pressure inlet and the low-pressure inlet are formed concentrically, so that a pressure guiding tube formed of a double pipe can be connected. The inner peripheral surface of each inlet is O
Rings 4a and 4b are provided. The low-pressure inlet is provided with branch passages 5 and 6 communicating with the upper and lower surfaces of the valve box, respectively. The upper and lower branch passages are provided for air release and drain release, respectively. The open ends are closed by plugs 5a and 6a, respectively. In the valve case 1, there is formed a horizontal hole 7 which is orthogonal to the high-pressure side pressure passage 2 and the low-pressure side pressure passage 3 and communicates with the front and rear of the valve box. And a substantially cylindrical cock body 8 rotatably provided around its axis. As shown in FIG. 5, the cock body 8 has two rows of diametrically parallel first pressure guiding holes 9 and second pressure guiding holes 10 as shown in FIG.
The first and second pressure guiding holes are formed on the same vertical surface, and are both formed so as to be orthogonal to the center axis of the cock body. The cock body is provided with a pressure equalizing passage 11 having a smaller diameter than the first and second pressure introducing holes, which is smaller than the pressure introducing holes. And the outlet 3b of the low-pressure side impulse line 3 communicates with the outlet 2b side of the low-pressure side impulse passage 3. In the present embodiment, the inlet 2a side and the outlet 2b side of the high-pressure side impulse line 2 and the low pressure side The side pressure passage 3 is configured to communicate with the outlet 3b side. More specifically, the pressure equalizing path 11 is extended from the high pressure side first opening 12a, which opens on the same circumference as the first pressure guiding hole, at the opposite side of the cock body from the opposite side of the center axis of the cock body. 2
A linear main pressure equalizing path 11a leading to the low pressure side opening 12c which opens on the same circumference as the pressure guiding hole, and the low pressure on the same circumference as the first pressure guiding hole branched from the main pressure equalizing path; Side opening 12c
And a branch pressure equalizing passage 11b extending to the high pressure side second opening 12b which opens on the same side as the above three openings 12b.
a, 12b, and 12c are formed on the same vertical surface including the central axis of the cock body. The upright surface including the first pressure introducing hole 9 and the second pressure introducing hole 10 and the upright surface including the pressure equalizing passage 11 are at an angle around the center axis of the cock body 8, for example, as shown in FIG. It is formed so as to form an angle of 45 °. Reference numeral 13 in the drawing denotes a handle for rotating the cock 8, 14 and 14 denote O-rings for sealing between each pressure guide path and the cock 8, 15 denotes a collar for fixing the O-ring, 16 is an O for sealing between the horizontal hole 7 and the cock body.
Each shows a ring. Reference numeral 17 denotes a closing plug. The closing plug is used for closing a hole into which a cutting tool is introduced when working a pressure guiding hole in the valve box, and 18 is a drain plug. In the case where the fluid to be measured is a gas, FIG.
As shown in FIGS. 3 and 4, an on-off valve is attached so that the drain is directed downward. When the fluid to be measured is a liquid, the drain is directed upward and used as a gas vent. Next, the operation of the on-off valve according to the present invention configured as described above will be described with reference to FIGS. When detecting the differential pressure, the handle 13 is operated to position the cock body at a certain angle, for example, an angle at which the handle is parallel to both pressure paths as shown in FIG. The high pressure side pressure passage 2 from the high pressure side inlet port 2a to the same outlet port 2b is connected to the high pressure side pressure passage 2 and the low pressure side pressure passage 3, respectively. The low-pressure side pressure passages 3 from the inlet 3a to the outlet 3b are independently communicated with each other. When closing the pressure guide passages 2 and 3, the cock body is rotated by operating the handle 13, and for example, as shown in FIG. 7, the handle is turned 90 ° counterclockwise from the state shown in FIG. When it is rotated in the circumferential direction and positioned at an angle orthogonal to both the impulse paths, the high-pressure side impulse path 2 and the low-pressure side impulse path 3 are simultaneously closed by the side surfaces of the cock body. When the impulse line is to be opened again, the handle 13 is turned clockwise by 90 ° and the cock is positioned in the state shown in FIG. The low-pressure side pressure guide path 3 is opened at the same time, so that the high-pressure side pressure and the low-pressure side pressure are simultaneously applied to the differential pressure gauge. Absent. When equalizing the pressures on the high pressure side and the low pressure side of the differential pressure gauge, for example, when adjusting the zero point of the differential pressure gauge or draining the drainage pressure, the pressure guiding path is closed as described above (see FIG. 7). 8), the handle 13 is further rotated, for example, 45 ° in the counterclockwise direction as shown in FIG. 8, and the pressure equalizing path 11 causes the inlet port 2 a side and the outlet port 2 b side of the high-pressure side impulse line 2. In addition, the outlet 3b side of the low-pressure side pressure passage 3 is communicated. Thus, the pressure on the high pressure side and the pressure on the low pressure side of the differential pressure gauge are both equal to the pressure in the high pressure side impulse line 2, so that the pressure difference applied to the differential pressure gauge becomes zero and the zero point adjustment can be performed. You can do it. After the zero point adjustment, the cock 13 is rotated clockwise, for example, by 45 degrees by operating the handle 13 so that the high pressure side pressure passage 2 and the low pressure side pressure passage 3 are connected as shown in FIG. In either case, the cock is turned to the closed state, or the cock body is further rotated clockwise by 90 °, and the high-pressure side pressure passage 2 and the low-pressure side The pressure paths 3 are communicated with each other so that the differential pressure can be measured. Next, an example of a use state of the on-off valve according to the present invention will be described based on a specific example in which the flow velocity of a fluid is measured by a pitot tube shown in FIG. In the figure, reference numeral 19 denotes a flow path pipe of a fluid to be measured, 20 denotes a pitot tube, 21 denotes an on-off valve according to the present invention, and 22 denotes a differential pressure gauge as a differential pressure detector. The total pressure tube 20a of the pitot tube 20 has a distal end facing the inside of the flow tube through a mounting hole 19a formed in a side surface of the flow tube 19, and a base end connected to the high pressure inlet 2a of the on-off valve 21. The distal end of the static pressure port 20b of the pitot tube is connected to the mounting hole 19a, and the proximal end is connected to the low pressure inlet 3a of the on-off valve 21. The high-pressure outlet 2b and the low-pressure outlet 3b of the on-off valve 21 are connected to the high-pressure side inlet and the low-pressure side inlet of the differential pressure gauge 22, respectively, and the differential pressure gauge 22 detects the differential pressure. The flow velocity is output based on the differential pressure. Various types of differential pressure gauges have been known in the art, and a detailed description thereof will be omitted. The cock body is rotated by operating the handle 13 as described above, and the high-pressure side pressure passage 2 is formed by the first and second conduction holes 9 and 10 as shown in FIG.
When the low pressure side impulse line 3 and the low pressure side impulse line 3 are both opened, the total pressure in the flow path pipe 19 is guided to the differential pressure gauge 21 through the total pressure line 20a of the pitot tube and the high pressure side impulse line 2 of the on-off valve. The static pressure in the conduit is guided from the static pressure port 20b of the pitot tube to the differential pressure gauge 22 through the low-pressure side impulse line 3 of the on-off valve. In this differential pressure gauge, for example, the difference between the total pressure and the static pressure is determined by a diaphragm mechanism. The pressure, that is, the dynamic pressure is detected, and based on this differential pressure (dynamic pressure), the flow velocity value is output by a needle indication, digital display, digital signal, or the like. In the above-described embodiment, the pressure equalizing path 11 has an outlet 2b side of the high-pressure side impulse line 2 and an outlet 3b side of the low-pressure side impulse path 3 and an inlet 2a side of the high-pressure side impulse path. Although it is a configuration that allows communication, it is sufficient to equalize the outlet side pressures of both impulse lines to perform zero point adjustment etc. of the differential pressure gauge. In some cases, communication with the port 2a may not be made, and in some cases, communication may be made with the introduction port 3a of the low-pressure side pressure passage instead of the introduction side of the high-pressure side pressure passage. Since the on-off valve according to the present invention has the above-described structure, the high-pressure side pressure passage and the low-pressure side pressure passage can be simultaneously opened and closed by operating the handle of the cock body. Can be. Therefore, the high-pressure side pressure and the low-pressure side pressure are simultaneously guided to the differential pressure detector, and there is little possibility that the differential pressure detector will be damaged by one-sided pressure. The opening / closing operation can be easily performed without performing a complicated operation in. Since the cock body is provided with a pressure equalizing passage, there is no need to provide a separate valve or the like for equalizing operation. By operating the handle of the cock body, the high-pressure side pressure passage and the low-pressure side conductive line are operated. The pressure at each outlet side of the pressure path, that is, the high pressure side and the low pressure side pressure of the differential pressure gauge can be equalized, and maintenance such as zero point adjustment of the differential pressure detector and drain or gas release can be easily performed. it can.
【図面の簡単な説明】
【図１】本発明に係る開閉弁の実施例を示す正面図。
【図２】本発明に係る開閉弁の実施例を示す横断平面
図。
【図３】図２のIII−III線縦断面図。
【図４】図２のIV−IV線縦断面図。
【図５】コック体の斜視図。
【図６】導圧路を開成した状態の(a)は横断平面図、(b)
は(a)のＸ−Ｘ線断面図。
【図７】導圧路を閉止した状態の(a)は横断平面図、(b)
は(a)のＹ−Ｙ線断面図。
【図８】均圧路により導圧路間を連通した状態の(a)は
横断平面図、(b)は(a)のＺ−Ｚ線断面図。
【図９】本発明に係る開閉弁の使用状態を示す一部横断
平面図。
【符号の説明】
１ 弁箱 ２ 高圧側導圧路
３ 低圧側導圧路 ４ａ、４ｂ Ｏリング
５、６ 分岐通路 ７ 横孔
８ コック体 ９ 第１導圧孔
１０ 第２動圧孔 １１ 均圧路
１２ａ 高圧側第１開口部 １２ｂ 高圧側第２
開口部
１２ｃ 低圧側開口部 １３ ハンドル
１４ Ｏリング １５ カラー
１６ Ｏリング １７ 閉止プラグ
１８ ドレン抜き １９ 流路管
２０ ピトー管 ２１ 開閉弁
２２ 差圧計BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of an on-off valve according to the present invention. FIG. 2 is a cross-sectional plan view showing an embodiment of the on-off valve according to the present invention. FIG. 3 is a vertical sectional view taken along the line III-III of FIG. 2; FIG. 4 is a vertical sectional view taken along the line IV-IV of FIG. 2; FIG. 5 is a perspective view of a cock body. FIG. 6 (a) is a cross-sectional plan view in a state where a pressure guiding path is opened, and FIG.
2 is a cross-sectional view taken along line XX of FIG. FIG. 7 (a) is a cross-sectional plan view in a state where the pressure guiding passage is closed, and FIG.
3A is a sectional view taken along line YY of FIG. 8 (a) is a cross-sectional plan view and FIG. 8 (b) is a cross-sectional view taken along line ZZ of FIG. FIG. 9 is a partial cross-sectional plan view showing a use state of the on-off valve according to the present invention. DESCRIPTION OF SYMBOLS 1 Valve box 2 High pressure side impulse line 3 Low pressure side impulse line 4a, 4b O-ring 5, 6 Branch passage 7 Side hole 8 Cock body 9 First pressure line 10 Second dynamic pressure line 11 Average Pressure path 12a High pressure side first opening 12b High pressure side second
Opening 12c Low pressure side opening 13 Handle 14 O-ring 15 Collar 16 O-ring 17 Closing plug 18 Drain drain 19 Flow path pipe 20 Pitot pipe 21 Open / close valve 22 Differential pressure gauge
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｇ０１Ｆ 1/36 Ｇ０１Ｆ 1/36 ３Ｈ０６７ 23/14 23/14 Ｇ０１Ｐ 5/16 Ｇ０１Ｐ 5/16 Ｚ Ｆターム(参考） 2F014 BA03 2F030 CA04 CF05 2F034 AA03 DA08 2F055 AA40 BB05 CC60 DD20 EE40 FF43 HH03 HH06 3H054 AA02 CA03 CA34 CC01 CD01 CE01 GG01 GG02 3H067 AA23 CC01 CC44 CC46 DD03 DD12 DD24 EA02 EA34 EC07 FF11 GG02 GG12 GG21 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // G01F 1/36 G01F 1/36 3H067 23/14 23/14 G01P 5/16 G01P 5/16 ZF Term (reference) 2F014 BA03 2F030 CA04 CF05 2F034 AA03 DA08 2F055 AA40 BB05 CC60 DD20 EE40 FF43 HH03 HH06 3H054 AA02 CA03 CA34 CC01 CD01 CE01 GG01 GG02 3H067 AA23 CC01 CC44 CC46 DD03 DD12 DD24 GG02 EA02
Claims (1)
至る高圧側導圧路と低圧側圧力導入口から同導出口に至
る低圧側導圧路が並列に形成され、前記高圧側導圧路と
低圧側導圧路を横断する円柱状のコック体を軸まわりに
回動可能に備え、このコック体は通常はその側面によっ
て前記高圧側導圧路と低圧側導圧路をともに閉止してい
るが、コック体を或る角度位置に回動せしめると前記高
圧側導圧路と低圧側導圧路を連通せしめる第１導通孔と
第２導通孔を直径方向に並列に有し、かつ、コック体を
他の角度位置に回動せしめると、少なくとも高圧導出口
側の高圧側導圧路と低圧導出口側の低圧側導圧路とを連
通せしめる均圧路を備えてなる差圧検出器用導圧路の開
閉弁。Claims: 1. A high-pressure side pressure passage from a high pressure side pressure inlet to the same outlet and a low pressure side pressure passage from a low pressure side pressure inlet to the same outlet are arranged in parallel in a valve box. A high-pressure side impulse path and a low-pressure side impulse path are provided with a cylindrical cock body rotatably around an axis. Although the low-pressure side impulse path is closed, when the cock body is rotated to a certain angle position, the first and second communication holes for connecting the high-pressure side impulse path and the low-pressure side impulse path are connected. When the cock body is turned to another angular position in parallel with the diametrical direction and the cock body is rotated to another angular position, at least the high pressure side pressure passage on the high pressure outlet side and the low pressure side pressure passage on the low pressure outlet side communicate with each other. An on-off valve for a pressure guiding passage for a differential pressure detector, comprising a pressure passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001235922A JP2003049958A (en) | 2001-08-03 | 2001-08-03 | Opening and closing valve of connecting passage for differential pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001235922A JP2003049958A (en) | 2001-08-03 | 2001-08-03 | Opening and closing valve of connecting passage for differential pressure detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003049958A true JP2003049958A (en) | 2003-02-21 |
Family
ID=19067284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001235922A Pending JP2003049958A (en) | 2001-08-03 | 2001-08-03 | Opening and closing valve of connecting passage for differential pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003049958A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062443A (en) * | 2012-12-14 | 2013-04-24 | 刘典军 | Friction sealing high-pressure reversing valve driven by variable-speed motor |
| CN105114386A (en) * | 2015-08-21 | 2015-12-02 | 浙江大学舟山海洋研究中心 | Low-power-consumption and large-flow high-speed switching valve |
| CN105971958A (en) * | 2016-06-12 | 2016-09-28 | 山东嘉岩石油科技开发有限公司 | Two-position four-way rotating reversing valve |
-
2001
- 2001-08-03 JP JP2001235922A patent/JP2003049958A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062443A (en) * | 2012-12-14 | 2013-04-24 | 刘典军 | Friction sealing high-pressure reversing valve driven by variable-speed motor |
| CN105114386A (en) * | 2015-08-21 | 2015-12-02 | 浙江大学舟山海洋研究中心 | Low-power-consumption and large-flow high-speed switching valve |
| CN105971958A (en) * | 2016-06-12 | 2016-09-28 | 山东嘉岩石油科技开发有限公司 | Two-position four-way rotating reversing valve |
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