JPH0719980A - Pressure detector - Google Patents
Pressure detectorInfo
- Publication number
- JPH0719980A JPH0719980A JP15895593A JP15895593A JPH0719980A JP H0719980 A JPH0719980 A JP H0719980A JP 15895593 A JP15895593 A JP 15895593A JP 15895593 A JP15895593 A JP 15895593A JP H0719980 A JPH0719980 A JP H0719980A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- receiving member
- fluid
- pipe
- pressure receiving
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920006026 co-polymeric resin Polymers 0.000 claims description 3
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 11
- 239000002184 metal Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、管内の流体圧力を検
出する圧力検出器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detector for detecting a fluid pressure in a pipe.
【０００２】[0002]
【従来の技術】管内を流れる流体の圧力を検出する圧力
検出器は、一般に被測定部位の管に測定用導管を設け、
その経路途中に被測定流体の圧力を他の測圧媒体の圧力
に変換する受圧部（ダイヤフラム等）を設けて受圧部の
圧力をブルドン管圧力計あるいは半導体ゲージ利用圧力
計等の圧力計に伝達するように構成されている。2. Description of the Related Art A pressure detector for detecting the pressure of a fluid flowing in a pipe is generally provided with a measuring conduit in a pipe at a measurement site,
A pressure receiving part (diaphragm, etc.) that converts the pressure of the fluid to be measured into the pressure of another pressure measuring medium is provided on the way, and the pressure of the pressure receiving part is transmitted to a pressure gauge such as a Bourdon tube pressure gauge or a semiconductor gauge-based pressure gauge. Is configured to.
【０００３】上記測定用導管の経路途中に受圧部を設け
る形式のものは、被測定流体の種類が色々に変わる配管
では、導管内等に被測定流体が残存し、不都合な場合が
ある。このため、受圧部のダイヤフラムを筒状とし、そ
の内側に被測定流体を流通させて被測定流体の種類が変
わったときに、被測定流体が残存しないような構成の圧
力検出器が、例えば実公昭４３−６２３１号公報あるい
は実公昭４８−４１０９２号公報により知られている。In the case of the type in which the pressure receiving portion is provided in the path of the measuring conduit, the measuring fluid remains in the conduit or the like in a pipe in which the type of the measuring fluid varies, which may be inconvenient. Therefore, the diaphragm of the pressure receiving portion is formed into a tubular shape, and when the fluid to be measured is circulated inside the diaphragm and the type of the fluid to be measured changes, a pressure detector having a structure in which the fluid to be measured does not remain, for example, It is known from JP-A-43-6231 or JP-B-48-41092.
【０００４】上記第一の公報の圧力検出装置は、流体流
路に弾性体で形成した断面が非円形の筒状体で受圧部を
構成してその内側に非測定流体を通し、筒状体の外周に
所定の間隙を置いて筐体で包囲してその間隙を受圧室と
し、この受圧室に充填した測圧媒体を筐体を貫通して圧
力計へ至る経路を介して圧力を測定するように構成され
ている。In the pressure detecting device of the above-mentioned first publication, the pressure receiving portion is formed by a tubular body formed of an elastic body in the fluid flow path and having a non-circular cross section. A pressure-measuring chamber is formed by surrounding a predetermined gap on the outer circumference of the casing to form a pressure-receiving chamber, and the pressure-measuring medium filled in the pressure-receiving chamber penetrates the casing to measure the pressure through a path to a pressure gauge. Is configured.
【０００５】第二の公報による圧力計の構成も第一の公
報のものとほぼ同様であるが、この公報では特にダイヤ
フラムを円筒型としている点が若干異なっている。The structure of the pressure gauge according to the second publication is almost the same as that of the first publication, but this publication is slightly different in that the diaphragm is of a cylindrical type.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上述した２
つの公報の圧力検出器に用いられている受圧部は、第一
の公報では非円形の筒状体、第二の公報では円筒形であ
り、いずれの場合も薄い金属隔膜の弾性材が使用されて
いる。この場合、第二の公報では受圧部は円筒形として
いるが、金属の弾性材では圧力計としての感度（応答速
度）が悪く、実際には若干の非円形状の筒状体とならざ
るを得ず、厳密には非円筒体である。By the way, the above-mentioned 2
The pressure receiving portion used in the pressure detector of the two publications is a non-circular tubular body in the first publication and a cylindrical body in the second publication, and in each case, a thin metal diaphragm elastic material is used. ing. In this case, although the pressure receiving portion is cylindrical in the second publication, the sensitivity (response speed) as a pressure gauge is poor with a metallic elastic material, and in reality, it is a slight non-circular cylindrical body. It is not obtained, and is strictly a non-cylindrical body.
【０００７】又、第一の公報では受圧部はその長さ方向
の有効部分が入口管内径よりはるかに小さく、第二の公
報では反対に相当大きな径とされている。このため、受
圧部では圧力が本流の圧力からわずかに変動し、正確な
圧力が測定できない。Further, in the first publication, the effective portion in the length direction of the pressure receiving portion is much smaller than the inner diameter of the inlet pipe, and in the second publication, the diameter is considerably large. For this reason, the pressure at the pressure receiving portion slightly fluctuates from the pressure of the main stream, and accurate pressure cannot be measured.
【０００８】さらに、このように受圧部の内側で内径が
変化するためにその境界付近にデッドスペースが生じ、
そこに微量の残存液が流体の種類が変わったときにどう
しても残ることになり、このため微量の残存液であって
も問題となるような配管系には使用することができな
い。Further, since the inner diameter changes inside the pressure receiving portion in this way, a dead space occurs near the boundary,
A trace amount of residual liquid will inevitably remain there when the type of fluid changes, and therefore even a trace amount of residual liquid cannot be used in a piping system that poses a problem.
【０００９】又、金属製の受圧部では管内の流体が変っ
たときに受圧部の表面に残存液が付着し易く、耐腐蝕性
が悪く、受圧部金属が出す金属（Ｆｅ等）イオンで管内
の流体が汚染される慮れもある。このため、管内の流体
の種類を変えるときは、配管内を洗浄する作業はきわめ
て困難であり、多大の労力、無駄な時間、費用を要して
いる。Further, in the metal pressure receiving portion, when the fluid in the pipe changes, the residual liquid is apt to adhere to the surface of the pressure receiving portion, the corrosion resistance is poor, and the metal (Fe etc.) generated by the pressure receiving metal causes the inside of the pipe. There is a possibility that the fluid of the above will be contaminated. For this reason, when changing the type of fluid in the pipe, the work of cleaning the inside of the pipe is extremely difficult, which requires a great deal of labor, wasted time, and cost.
【００１０】この発明は、上述した従来の圧力検出器を
配管系に用いて圧力を検出する場合の種々の問題点に留
意して、受圧部材にフッ素樹脂を用いることにより圧力
検出部の内径を全長に亘り同一として正確な圧力測定が
でき、かつ洗浄する際に微量の残存液も残らないで、耐
食性が向上し金属イオンによる流体の汚染が生じず、感
度も良好で、しかも構造が簡単な圧力検出器を提供する
ことを課題とする。In the present invention, attention is paid to various problems when pressure is detected by using the above-mentioned conventional pressure detector in a piping system, and by using a fluororesin as a pressure receiving member, the inner diameter of the pressure detecting portion can be reduced. Accurate pressure measurement is possible over the entire length, and even if a small amount of residual liquid remains during cleaning, corrosion resistance is improved, fluid contamination by metal ions does not occur, sensitivity is good, and the structure is simple. An object is to provide a pressure detector.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決する手段
としてこの発明は、圧力測定管の内側に流路方向に略同
一径でかつ被測定流体の流れる管内径と略同じ径の円筒
状の薄い受圧部材を設け、上記受圧部材はフッ素樹脂か
ら成り、受圧部材の外周に設けた間隙を受圧室とし、受
圧室に充填した測圧媒体を圧力計へ導いて圧力を測定す
るように構成して成る圧力検出器としたのである。As a means for solving the above-mentioned problems, the present invention has a cylindrical shape having substantially the same diameter in the flow passage direction inside a pressure measuring pipe and having a diameter substantially the same as the inner diameter of the pipe through which the fluid to be measured flows. A thin pressure receiving member is provided, the pressure receiving member is made of fluororesin, and the gap provided on the outer periphery of the pressure receiving member serves as a pressure receiving chamber, and the pressure measuring medium filled in the pressure receiving chamber is guided to a pressure gauge to measure the pressure. It is a pressure detector composed of
【００１２】この場合、前記受圧部材を、４フッ化エチ
レン樹脂、４フッ化エチレン−６フッ化プロピレン共重
合樹脂、及び４フッ化エチレン−エチレン共重合樹脂の
一群から選ばれる一種以上のフッ素樹脂から成るものと
することができる。In this case, the pressure receiving member is made of one or more fluororesins selected from the group consisting of tetrafluoroethylene resin, tetrafluoroethylene-6 fluoropropylene copolymer resin, and tetrafluoroethylene-ethylene copolymer resin. Can consist of:
【００１３】[0013]
【作用】上記の構成としたこの発明の圧力検出器では、
受圧部材の外側に形成された受圧室に充填された液に流
体の圧力を伝達し、その圧力を圧力計に送って圧力が測
定される。In the pressure detector of the present invention having the above structure,
The pressure of the fluid is transmitted to the liquid filled in the pressure receiving chamber formed outside the pressure receiving member, and the pressure is sent to the pressure gauge to measure the pressure.
【００１４】受圧部材はフッ素樹脂であり、かつ被測定
流体の流れる管内径とほぼ同じ径でその流路方向に同一
径であるため、流路途中にデッドスペースは生じない。
このため、圧力測定は圧力変動が生じることなく正確に
測定でき、流体の洗浄をする際に微量の残存液も内側に
残らず、洗浄が極めて容易となる。Since the pressure receiving member is made of fluororesin and has a diameter substantially the same as the inner diameter of the pipe through which the fluid to be measured flows and has the same diameter in the flow passage direction, no dead space occurs in the flow passage.
Therefore, the pressure measurement can be performed accurately without pressure fluctuation, and when cleaning the fluid, a small amount of residual liquid does not remain inside and cleaning is extremely easy.
【００１５】フッ素樹脂製の受圧部材であるから、耐食
性も向上し、金属イオンによる流体の汚染もなく、受圧
部材が柔らかいため円筒状であっても圧力検出の感度は
良好である。Since the pressure receiving member is made of a fluororesin, the corrosion resistance is improved, the fluid is not contaminated by metal ions, and the pressure receiving member is soft and the pressure detection sensitivity is good even if it is cylindrical.
【００１６】[0016]
【実施例】以下この発明の実施例について図面を参照し
て説明する。図１は実施例の圧力検出器の主要断面図を
示す。この圧力検出器は圧力検出部１と圧力計２から成
り、圧力検出部１は圧力測定管３の両端にフランジ４、
４を備えている。圧力測定管３の内側には、測定しよう
とする流体が流れる管路の内径とほぼ同一径の内径とな
る受圧部材５が設けられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main sectional view of a pressure detector of the embodiment. This pressure detector comprises a pressure detector 1 and a pressure gauge 2. The pressure detector 1 has flanges 4 on both ends of a pressure measuring pipe 3.
It is equipped with 4. Inside the pressure measuring pipe 3, there is provided a pressure receiving member 5 having an inner diameter substantially the same as the inner diameter of the pipeline through which the fluid to be measured flows.
【００１７】受圧部材５は、流路方向の全長に亘って同
一内径で、フッ素樹脂が使われる。フッ素樹脂は、この
実施例では４フッ化エチレン樹脂、いわゆるテフロン
（商品名）が使用されているが、この他にも４フッ化エ
チレン−６フッ化プロピレン共重合樹脂、及び４フッ化
エチレン−エチレン共重合樹脂の一群から選ばれる一種
以上のフッ素樹脂とすることもできる。The pressure receiving member 5 is made of fluororesin with the same inner diameter over the entire length in the flow path direction. As the fluororesin, a tetrafluoroethylene resin, so-called Teflon (trade name) is used in this embodiment. In addition to this, a tetrafluoroethylene-6-fluoropropylene copolymer resin and a tetrafluoroethylene- It is also possible to use one or more fluororesins selected from the group of ethylene copolymer resins.
【００１８】圧力測定管３の内側には受圧部材５との間
に所定の隙間を形成するように大径部６を設け、この大
径部６と受圧部材５との間の空間を受圧室７とし、受圧
室７には封入液を充填する。A large diameter portion 6 is provided inside the pressure measuring pipe 3 so as to form a predetermined gap with the pressure receiving member 5, and a space between the large diameter portion 6 and the pressure receiving member 5 is provided in the pressure receiving chamber. 7, and the pressure receiving chamber 7 is filled with the filled liquid.
【００１９】圧力測定管３の中央付近には測圧管８が設
けられ、その内孔９内を通り固定座１０に取付けられた
連結管（株）１１を介して圧力が圧力計２へ伝達される
ように構成される。A pressure measuring pipe 8 is provided near the center of the pressure measuring pipe 3, and the pressure is transmitted to the pressure gauge 2 through a connecting pipe 11 passing through the inner hole 9 and attached to the fixed seat 10. To be configured.
【００２０】圧力計２としては、ブルドン管圧力計を図
示しているが、これ以外にも例えば半導体ゲージ利用の
圧力計、あるいはストレンゲージを用いて電気的な信号
により圧力を測定する方式のものなどいずれの形式のも
のでもよい。１２はフランジ４を固定する取付ボルト、
１３はＯリングである。As the pressure gauge 2, a Bourdon tube pressure gauge is shown, but other than this, for example, a pressure gauge using a semiconductor gauge or a method of measuring pressure by an electrical signal using a strain gauge Any format may be used. 12 is a mounting bolt for fixing the flange 4,
13 is an O-ring.
【００２１】なお、図示のように受圧部材５はフランジ
４を挟んで円周状に縁部５ａ、５ｂを一体に備えてい
る。As shown in the figure, the pressure receiving member 5 is integrally provided with the peripheral edge portions 5a and 5b with the flange 4 interposed therebetween.
【００２２】上記の構成とした実施例の圧力検出器の作
用は次の通りである。図示の圧力検出器は、測定すべき
流体の流れる管路の途中にフランジ４、４を介して挿
入、取付けされる。The operation of the pressure detector of the embodiment having the above structure is as follows. The illustrated pressure detector is inserted and attached via flanges 4 and 4 in the middle of a pipeline through which a fluid to be measured flows.
【００２３】流路中の流体が圧力測定管３内を通過する
と、流体の圧力は受圧部材５の受圧室７に対応する部分
で封入液に圧力を伝達し、これが圧力計２まで送られて
圧力計２で圧力が表示される。上記圧力を受圧部材５で
感知する場合、受圧部材５の内径は流路方向に全て同一
径でありかつ管路の内径とほぼ同じであるから、圧力測
定管３内で流体の圧力が変動することがなく正しい圧力
が測定される。When the fluid in the flow path passes through the pressure measuring pipe 3, the pressure of the fluid is transmitted to the enclosed liquid at the portion corresponding to the pressure receiving chamber 7 of the pressure receiving member 5, and this is sent to the pressure gauge 2. The pressure is displayed on the pressure gauge 2. When the pressure is detected by the pressure receiving member 5, the pressure receiving member 5 has the same inner diameter in the flow path direction and is substantially the same as the inner diameter of the pipe, so that the pressure of the fluid fluctuates in the pressure measuring pipe 3. Without the correct pressure being measured.
【００２４】又、管路内の流体の種類を変えて流すと
き、先に用いた流体は圧力測定管３内に微量であれ残存
することなく容易に全て洗浄排出される。従来の圧力検
出器のように径が変化する境界部付近にデッドスペース
が全くなく、又フッ素樹脂の受圧部材５を使用している
からその表面に流体が残存付着することがないからであ
る。When changing the type of the fluid in the pipe, the fluid used previously is easily washed and discharged without remaining in the pressure measuring pipe 3, even if it is a trace amount. This is because there is no dead space near the boundary where the diameter changes as in the conventional pressure detector, and since the pressure receiving member 5 made of fluororesin is used, the fluid does not remain and adhere to the surface thereof.
【００２５】さらに、フッ素樹脂の受圧部材５を用いて
いるため、耐食性も向上し、金属製の受圧部材のような
金属イオンによる流体の汚染ということも生じない。圧
力の感度は、金属製の受圧部材を円筒状にすると低下す
るが、この実施例ではフッ素樹脂製であるから、感度が
低下することもなく圧力を検出できる。Further, since the pressure receiving member 5 made of fluororesin is used, the corrosion resistance is improved, and the fluid is not contaminated by metal ions unlike the pressure receiving member made of metal. The pressure sensitivity decreases when the metal pressure-receiving member is formed into a cylindrical shape, but since the pressure receiving member is made of fluororesin in this embodiment, the pressure can be detected without decreasing the sensitivity.
【００２６】[0026]
【効果】以上詳細に説明したように、この発明の圧力検
出器は、管路内径と略同じ内径を有する圧力測定管内に
薄いフッ素樹脂製の受圧部材を設け、受圧部材外周に設
けた受圧室に測圧媒体を充填して圧力を圧力計へ伝達す
るようにしたから、圧力変動がなく正確な圧力測定がで
き、洗浄処理が容易で微量の残存液も残らずに排出さ
れ、耐食性が向上しかつ金属イオンによる流体の汚染も
生じず、圧力感度も良好である。As described in detail above, in the pressure detector of the present invention, a pressure receiving member made of a thin fluororesin is provided in the pressure measuring tube having an inner diameter substantially equal to the inner diameter of the conduit, and a pressure receiving chamber provided on the outer circumference of the pressure receiving member. Since the pressure measuring medium is filled in and the pressure is transmitted to the pressure gauge, accurate pressure measurement can be performed without pressure fluctuation, the cleaning process is easy, and even a small amount of residual liquid is discharged, improving corrosion resistance. Moreover, the contamination of the fluid by metal ions does not occur, and the pressure sensitivity is good.
【図１】実施例の圧力検出器の主要断面図FIG. 1 is a main sectional view of a pressure detector according to an embodiment.
１ 圧力検出部 ２ 圧力計 ３ 圧力測定管 ４ フランジ ５ 受圧部材 ６ 大径部 ７ 受圧室 ８ 測圧管 ９ 内孔 １０ 固定座 １１ 連結管 1 Pressure Detector 2 Pressure Gauge 3 Pressure Measuring Pipe 4 Flange 5 Pressure Receiving Member 6 Large Diameter Part 7 Pressure Receiving Chamber 8 Pressure Measuring Pipe 9 Inner Hole 10 Fixed Seat 11 Connecting Pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 真鍋 出 大阪市此花区春日出中３丁目１番98号 住 友化学工業株式会社内 (72)発明者 武田 修一 大阪市此花区春日出中３丁目１番98号 住 友化学工業株式会社内 (72)発明者 鶴飼 浩之 大阪市此花区春日出中３丁目１番98号 住 友化学工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Manabe De, 3-98 Kasugade, Konohana-ku, Osaka City Sumitomo Chemical Co., Ltd. (72) Inventor, Shuichi Takeda 3-chome, Kasugade, Konohana-ku, Osaka 1-98 Sumitomo Chemical Co., Ltd. (72) Inventor Hiroyuki Tsurukai 3-98 Kasugade, Konohana-ku, Osaka City Sumitomo Chemical Co., Ltd.
Claims (2)
でかつ被測定流体の流れる管内径と略同じ径の円筒状の
薄い受圧部材を設け、上記受圧部材はフッ素樹脂から成
り、受圧部材の外周に設けた間隙を受圧室とし、受圧室
に充填した測圧媒体を圧力計へ導いて圧力を測定するよ
うに構成して成る圧力検出器。1. A cylindrical thin pressure-receiving member having substantially the same diameter in the flow passage direction and having substantially the same diameter as the inner diameter of the pipe through which the fluid to be measured flows is provided inside the pressure measuring pipe, and the pressure-receiving member is made of fluororesin. A pressure detector configured such that a gap provided on the outer circumference of a pressure receiving member serves as a pressure receiving chamber, and a pressure measuring medium filled in the pressure receiving chamber is guided to a pressure gauge to measure pressure.
脂、４フッ化エチレン−６フッ化プロピレン共重合樹
脂、及び４フッ化エチレン−エチレン共重合樹脂の一群
から選ばれる一種以上のフッ素樹脂から成るものとした
ことを特徴とする請求項１に記載の圧力検出器。2. The pressure receiving member is made of one or more fluororesins selected from the group consisting of tetrafluoroethylene resin, tetrafluoroethylene-6-fluoropropylene copolymer resin, and tetrafluoroethylene-ethylene copolymer resin. The pressure detector according to claim 1, wherein the pressure detector comprises:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15895593A JPH0719980A (en) | 1993-06-29 | 1993-06-29 | Pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15895593A JPH0719980A (en) | 1993-06-29 | 1993-06-29 | Pressure detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0719980A true JPH0719980A (en) | 1995-01-20 |
Family
ID=15683001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15895593A Pending JPH0719980A (en) | 1993-06-29 | 1993-06-29 | Pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0719980A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11118638A (en) * | 1997-10-09 | 1999-04-30 | Yamatake Corp | Apparatus for measuring pressure loss or flow rate of high viscosity slurry fluid and manufacture of its measuring tube |
| CN102680166A (en) * | 2012-05-22 | 2012-09-19 | 西安飞机工业（集团）有限责任公司 | Pressure measuring joint of liquid pipeline |
| CN108871665A (en) * | 2018-06-28 | 2018-11-23 | 安徽徽宁电器仪表集团有限公司 | A kind of pressure transmitter convenient for cleaning |
-
1993
- 1993-06-29 JP JP15895593A patent/JPH0719980A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11118638A (en) * | 1997-10-09 | 1999-04-30 | Yamatake Corp | Apparatus for measuring pressure loss or flow rate of high viscosity slurry fluid and manufacture of its measuring tube |
| CN102680166A (en) * | 2012-05-22 | 2012-09-19 | 西安飞机工业（集团）有限责任公司 | Pressure measuring joint of liquid pipeline |
| CN108871665A (en) * | 2018-06-28 | 2018-11-23 | 安徽徽宁电器仪表集团有限公司 | A kind of pressure transmitter convenient for cleaning |
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