The o - seal feature will effectively double block and bleed in most services , provided the line media is free of foreign matter and solids in suspension 在大多数应用中， o形密封能够有效的双重阻塞和排气，确保管路内的流体介质不受外部物质和滞留固体颗粒的侵扰。
Intercept the fluid medium upstream of the valve to be inspected with a shut - off valve and ensure that the subject valve is not under pressure ( vent downstream , if necessary ) 截取阀门上游的流体介质，用一个关闭阀门来进行检测，确保相关的阀门不处在压力下(如果必要的话，排除下游的流体介质) 。
The noise of such structures root in the shell vibration that drove by the inner engine , when coupled with the liquid medium , the noise will affect the performance of the vessels badly 这些航行器的结构噪声来源于内部机械激励壳体振动，并带动周围流体介质振动产生声辐射，它严重影响了水下航行器的整体性能。
Robust body with raised seating surfaces ground to mirror - like finish . hard plug and body seat facings available . body and plug seats protected from line media in open - close positions 坚固耐用的阀体，配置具有研磨镜面光洁度的凸面阀座表面。可提供坚硬的阀塞和阀体阀座面。在开启-关闭位置，可防止管路流体介质进入阀体和阀塞阀座内。
It is mandatory to prevent the reverse flow of fire protection system substances , i . e . , glycerin wetting agents , stagnant water and water of non - potable quality from being pumped or siphoned into the potable water line 这种总成强制性防止消防系统流体介质的倒流(回流) ，如甘油润湿剂，积滞水和非饮用水，防止这些流体介质泵吸或虹吸进饮用水管道。
Noise control can be well actualized with understanding of the acoustics characters of thin plate , cylindrical shell , stiffened plate and stiffened shell in liquid medium , which are the most common structure of car , aircraft and ship 薄板、圆柱壳、加筋板、加肋圆柱壳是汽车、轮船、飞机等交通工具中的结构组织形式，了解他们在流体介质中的声学特性有助于对他们实施有效的减振降噪措施。
Stainless steel pressure gauge is windely used for oil industry , chemical imdustry , chemical fibre industry , metallurgical industry , power station and so on . it can measure the pressure of all kinds of liquid medium in technological processes which has higher require for corrosion - resisted and antivibration characters 不锈钢压力表广泛用于石油、化工、化纤、冶金、电站等工业部门中对耐腐、搞振有要求较高的工艺流程中测量各种流体介质的压力。
Using finite element and boundary element method , a modal analysis model of complex structural acoustic radiation in light fluid is proposed for computing modal acoustic radiation frequency , farfield sound pressure , modal radiated acoustic power and acoustic radiation efficiency 摘要采用有限元和边界元方法建立了轻流体介质中复杂结构振动声辐射的模态分析模型，可计算结构的声辐射模态频率、模态场点声压、模态辐射声功率和声辐射效率等声场特性参数。
In an oil well , the casing is a steel circular pipe , and it would confine and guide the electromagnetic wave propagating ; and the electric properties of the fluid media would determine the propagation factor of the guided wave and affect the distribution state of the electromagnetic field 油井内的套管是钢铁质圆管，对电磁波的传播将产生限制和引导作用；油井内流体介质的电性质将决定导波的传播常数，影响电磁场在井的轴向上和横向上的分布状态和波的传播特性。
Through analyzing the surface microstructure of counter - cavitational material and the factors of affecting cavitation , on the basis of material mechanical properties , metallurgical parameters and fluid mechanical conditions , the paper presents cavitation erosion mechanism in multitude fluid medium , whereby offers references for calculating erosion rate 通过对抗气蚀材料表面显微结构和影响气蚀因素的分析，从材料的机械性能、冶金学参数和流体力学条件出发，综述多项流体介质作用下气蚀磨蚀的机理，从而为计算气蚀磨蚀速率提供参考
