孔板流量计

This paper tries to deduct rigorously the equation for the flow rate by using the Bernoulli equation,and to provide the expression of flow rate coefficient.

在孔板流量计中，流体流过孔板，孔板前后的流道面积收缩，其静压能转化为动能，从而出现压差，压差的大小反映流量的大小。

This article makes a comparison between influence of the nature of fluid flowing on the performance of the meter and dry adjustment of flow measure probe in the application of gas supersonic flow meter and orifice-plate flowmeter in the petroleum industry.

文章对气体超声流量计与孔板流量计在天然气工业中应用的两个主要方面：流体流动特性对仪表性能的影响和流量计的干校问题进行比较，分析它们存在的问题及发展前景。

Main business: Sales Main Products: Temperature instrumentation, pressure instrumentation, flow meters, material / liquid level instruments, metering equipment, control systems thermocouples, thermal resistors, wire compensation, pressure gauge, transmitter, pressure transmitter, Smart Transmitter, Level Transmitter, Flow Meter, Orifice flowmeters, electromagnetic flowmeter, vortex flowmeter, Verabar, metal tube rotameter, gas flowmeter, no NG Paperless Recorder, indicating regulator, regulator, hand fuck, and Flow Totalizer, level transmitter, pressure calibrator, process calibrator, digital pressure gauge, check simulation device, auto-calibration system.

主要业务∶销售主营产品：温度仪表，压力仪表，流量仪表，物/液位仪表，计量仪器，控制系统热电偶，热电阻，补偿导线，压力表，变送器，压力变送器，智能变送器，液位变送器，流量计，孔板流量计，电磁流量计，涡街流量计，威力巴流量计，金属管浮子流量计，气体流量计，无仪纸记录仪，显示调节仪，调节器，手操器，流量积算仪，液位变送器，压力校验仪，过程校验仪，数字压力计，校验仿真仪，自动校验系统。

Among the flowmeters discussed are orifice plate meters, venturi meter and standard nozzles, critical flow venturi nozzles, positive displacement flowmeters, turbine and related flowmeters, vortex shedding and fluidic flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, and coriolis flowmeters.

在讨论的是孔板流量计米，丘米和标准喷嘴，文丘里喷嘴临界流，容积流量计，涡轮机和相关流量计，涡脱落和射流流量计，电磁流量计，超声波流量计和科氏流量计。

It is proved that the model is in good agreement with the literature data. Standard error is less than 0.01(σ.01). Using this model, process simulation of the experiment of the test of orifice - plate flow - meter is carried out on computer.

在孔板流量计或文丘里管的计算过程中，习惯上常常使用查表的方法以确定孔板流量计的流量系数，但是，在化工过程模拟计算过程中，这种方法却难以奏效。

Details: First, an overview of orifice flow meter is also known as differential pressure flowmeter is determined by a test piece and the second device (differential pressure transmitter and flow indicator), is widely used in gas , steam and liquid flow measurement.

详细介绍：一、概述孔板流量计又称为差压式流量计，是由一次检测件和二次装置(差压变送器和流量显示仪)组成，广泛应用于气体、蒸汽和液体的流量测量。

Orifice flow meter and nozzle flow meter were added in the retrofit test platform to measure the differential pressure.

改造后增加了孔板流量计及喷嘴流量计实验内容，通过孔板、喷嘴测量压差，求出流量系数。

Bored pipe shall not be considered to be usable for the fabrication of orifice meter tubes until the design engineer has reviewed the data authorized its utilization by means of his signature on the data sheet.

如果未经设计工程师检查数据，并在数据表上签名认可，镗孔后的管子不得用来安装孔板流量计的管子。

The design element and the experiment result of reversible orifices and changing orifices low velocity flow is high.

分析了可逆式孔板流量计和可变式孔板流量计的设计原理和实验结果。

My company Vortex Flowmeter, Metal Tube Variable Area Flowmeter, standard orifice flowmeter flow measurement and other products are also made vast numbers of users, our products have independent intellectual property rights, with the National Metrology production permits for the adapt to the rapid development of high technology and business challenges of the sea fierce competition, our company continuously introducing advanced technology, technical and technological equipment, product technology, quality levels improved steadily and gradually in line with international standards, a variety of products with the domestic industries, and a number of national patents and awards.

我公司的涡街流量计、金属管浮子流量计、标准孔板流量计等产品也在流量计量方面也取得广大用户的认可，我公司产品均具有自主知识产权，拥有国家计量生产许可证，为适应高科技的飞速发展和商海激烈竟争的挑战，我公司不断引进先进技术、工艺和技术装备，使产品技术、质量水平稳步提高并逐步与国际接轨，多种产品居国内同行业之首，并获得多项国家专利权和各种奖项。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。