噴嘴的測量是依據流體力學的節(jié)流原理。當充滿管道的流體流經管道內的噴嘴時，流束將在噴嘴處形成局部收縮，從而使流速加快，靜壓力降低。于是在噴嘴前后便產生了壓力降或叫壓差。介質流動的流量愈大，在噴嘴前后產生的壓差也就愈大。根據壓差的平方根與流量成正比的關系，利用差壓儀表測量壓差來確定流體流量。

The measurement of nozzle is based on the throttling principle of fluid mechanics. When the fluid full of the pipe flows through the nozzle in the pipe, the beam will form a local contraction at the nozzle, which will accelerate the flow rate and reduce the static pressure. So there is a pressure drop or differential pressure before and after the nozzle. The greater the flow rate of the medium flow, the greater the pressure difference before and after the nozzle. According to the relationship between the square root of the pressure difference and the flow rate, the differential pressure instrument is used to measure the pressure difference to determine the fluid flow rate.

●標準噴嘴（ISA1932噴嘴）

● standard nozzle (isa1932 nozzle)

適用介質；適合高溫高壓蒸汽和水、也可用于各種氣體、液體；

Suitable medium; suitable for high temperature and high pressure steam and water, also can be used for various gases and liquids;

公稱口徑：DN50—DN500 （DN>500亦可設計、生產）；

Nominal diameter: dn50-dn500 (DN > 500 can also be designed and produced);

工作壓力：≦42MPa；

Working pressure: ≤ 42MPa;

工作溫度：-50℃ — 650℃；

Working temperature: - 50 ℃ - 650 ℃;

取壓方式：角接取壓；

Pressure measurement method: angular connection pressure measurement;

噴嘴安裝方式：管道式、夾持式、焊接式；

Nozzle installation mode: pipe type, clamping type and welding type;

執(zhí)行標準：IS05167；GB/T2624；

Executive standard: is05167; GB / t2624;

精確度：符合標準±1.0 %；

Accuracy: ± 1.0% of the standard;

材質：法蘭或夾持件：按介質溫度可選碳鋼、合金鋼；不銹鋼等；

Material: flange or clamp: carbon steel, alloy steel, stainless steel, etc. can be selected according to medium temperature;

噴嘴：不銹鋼304；316等。

Nozzle: stainless steel 304; 316, etc.

●長徑噴嘴

Long diameter nozzle

適用介質；特別適合高溫高壓蒸汽和水、也可用于各種氣體、液體；

Suitable medium; especially suitable for high temperature and high pressure steam and water, also can be used for various gases and liquids;

公稱口徑：DN50—DN500；

Nominal diameter: dn50-dn500;

工作壓力：≦42MPa；

Working pressure: ≤ 42MPa;

工作溫度：-50℃ - 650℃；

Working temperature: - 50 ℃ - 650 ℃;

取壓方式：徑距（D-D/2）取壓；

Pressure measuring method: diameter distance (D-D / 2);

噴嘴件安裝方式：配帶并焊接上、下游管段再按徑距（D-D/2）設置取壓孔；

Installation method of nozzle parts: the upstream and downstream pipe sections are equipped and welded, and then the pressure tapping holes are set according to the diameter distance (D-D / 2);

執(zhí)行標準：IS05167; GB/T2624；

Executive standard: is05167; GB / t2624;

精確度：符合標準±2.0 %；

Accuracy: ± 2.0% of the standard;

材質：上、下游管段按介質溫度可選碳鋼、合金鋼；不銹鋼等；

Material: carbon steel, alloy steel, stainless steel, etc. can be selected for upstream and downstream pipe sections according to medium temperature;

噴 嘴：不銹鋼304； 316等。

Nozzle: stainless steel 304; 316, etc.

標準噴嘴

Standard nozzle

（ISA1932噴嘴）

(isa1932 nozzle)

●Long diameter nozzle

1、盡可能避免測量管內變成負壓； 1. Avoid negative pressure in the measuring tube as far as possible; 2、避免附近有大電機、大變壓器等，以免引起噴嘴場干擾； 2. Avoid large motor and transformer nearby to avoid interference of nozzle field; 3、選擇震動小的場所，特別對一體型儀表； 3. Choose the place with small vibration, especially for the integrated instrument; 4、易于實現傳感器單獨接地的場所； 4. It is easy to realize sensor grounding separately; 5、盡可能避免受陽光直照； 5. Avoid direct sunlight as much as possible; 6、盡可能避開周圍環(huán)境有高濃度腐蝕性氣體； 6. Avoid corrosive gas with high concentration in the surrounding environment as far as possible; 7、盡量滿足計算書要求的前后直管段。 7. Try to meet the requirements of the calculation sheet before and after the straight pipe section.

1、可水平、垂直或傾斜安裝，應保證管內充滿介質； 1. It can be installed horizontally, vertically or obliquely, and the pipe should be filled with medium; 2、節(jié)流裝置前，后直管段應是直的，無肉眼可見彎曲，同時應是“圓的”，內壁應潔凈，無凹坑與沉淀物； 2. Before and after the throttling device, the straight pipe section should be straight without visible bending, and should be "round". The inner wall should be clean and free of pits and sediments; 3、直管段長度要求及節(jié)流裝置安裝應符合GB/T26224—93有關規(guī)定； 3. The length requirements of straight pipe section and installation of throttling device shall comply with relevant provisions of GB / t26224-93; 4、引壓管路安裝應符合標準規(guī)定的規(guī)范。 4. The installation of pressure pipeline should conform to the standard.