They are opened by velocity pressure, and closed by gravity.
它们在流体流速压力下开启，在重力作用下关闭。
They are opened and sustained in the open position by the force of velocity pressure, and closed by the force of gravity.
他是利用流体速度压力来开启和保持在开启的位置，并利用重力的作用来关闭。
The diffuser of mine main fan is a device to use reducing velocity pressure of outlet, increase static pressure and recovery kinetic energy.
矿井主扇扩散器是用来降低出口速压以提高风机静压而回收风机出口动能的装置。
This makes the business sales personnel have, rely on distributors, rely on large family gave up return velocity pressure goods performance.
这就使得业务型销售人员吃得开，依赖经销商、靠大户不惜放弃回款速度压货出业绩。
The disc and associated moving parts may be in a constant state of movement if the velocity pressure is not sufficient to hold the valve in a wide open and stable position.
如果流体流速压力无法将阀门支撑在一个较大的开启度并保持在稳定的开启位置，则阀瓣和相关的运动部件可能会处于一种持续振动的状态。
The change can be instigated by an external control or it can be automatic, for instance in response to variations in heat, pressure or velocity.
这种变形可能是通过外部控制或自发产生，例如，对温度、压力、和速度的改变做出反应。
Well, let's first ask the question, when is the viscous term and the pressure term the same for what velocity?
首先，让我问个问题，什么时候，粘性项和，压力项等于多大速度？
The model includes solid velocity, space grade of saturation with vapour density and space grade of porous pressure in concrete multiphase system.
考虑了混凝土多相系统中固体速度、饱和度乘蒸汽密度的空间梯度和孔隙压力空间梯度；
The result of simulation indicated that higher printing velocity and printing pressure would improve the performance of solder paste printing if other factors were not considered.
研究表明：在不考虑其他焊膏印刷性能影响因素下，较高的印刷速度和印刷压力能提高焊膏印刷性能。
Objective To explore the influence of perfusion pressure, blood concentration and blood flow velocity on myocardial ultrasonic backscatter integration.
目的探讨心脏灌注压、血液浓度和血流速度对组织背向散射强度的影响。
Nitrogen gas with different displacing velocity and pressure was used to displace the core in testing, the permeability damage and correlation analysis caused by velocity sensitivity were obtained.
实验用氮气以不同的驱替速度和驱替压差驱替岩心，得到由速敏性引起的渗透率损害及相关分析结果。
Industrial flow servovalve combined with an accumulator has been used in controlling the cylinder pressure to ensure system stability, velocity, and accuracy.
阐明根据工艺特点采用工业流量伺服阀和蓄能器控制油缸压力可以满足稳定、快速、准确的要求。
The SPRD is used on zone systems when the automatic closing of various zone dampers can create an excessive increase in air pressure and velocity throughout the duct system.
SPRD旁通阀是当各种区域风门自动关闭时用在区域系统中，可以在管道系统中增加空气压力盒速度。
The results of arc pressure field, fluid velocity field, and electric potentials are identical with the results in literature.
压力场、流体速度和电势的计算结果与文献计算结果相一致。
Predictions have been made and compared with experimental data pertaining to the centerline velocity decay and wall static-state pressure variation.
预测了壁面压强和轴心速度分布，并与实验数据进行比较，计算值与试验值吻合很好。
The main factors are materiel viscidity, pressure of spraying gas, materiel velocity of flow.
主要影响因素有：粘度、喷雾气体压力、物料流速。
Effects of the specific pressure on nucleation rate and linear growth velocity were expounded in squeeze casting.
阐述了挤压铸造比压对形核率及成长线速度的影响。
Through solving the blood flow equations for local vessel expansion region, the analytical expressions of blood flow velocity, pressure and wall shear stress were then obtained.
接着，通过求解局部扩张血管段内的血液流动方程，导得血液流速、压力和血管壁切应力的分析表达式。
Use the dynamic pressure and velocity to control the energy of the vehicle.
利用动压和速度制动来控制轨迹飞行器的能量。
The main parameters of viscosity, spinning temperature, pressure and winding velocity for coal tar pitch fluid should be rigidly controlled during spinning.
在纺丝过程中，要严格控制煤沥青熔体的粘度、纺丝温度、压力、卷绕速度等主要参数。
The model can simulate the velocity and pressure distribution of molecular in the pumping channel.
这个模型可以模拟在分子泵抽气通道内的气体分子速度与压力的分布。
PVT represents pressure, velocity and time. Don't calculate single factor in choosing material of bearings.
PVT代表压力、速度和时间，在选择轴承材料时，不能把单个因素分开考虑。
Velocity and pressure sensitivities caused by pressure jump are the third potential damage factors.
由压力突增而形成的速敏、压敏是第三位的潜在伤害因素。
Based on the energy equation of hydrodynamics, the distribution of velocity and pressure in the classifier was analyzed.
利用流体力学的能量方程，分析了分级机内的速度和压力分布。
The three dimension flow field in the triple-screw extruder with triangle configuration is the research objects, including velocity field, pressure field and shear rate field etc.
本课题以三角形排列的三螺杆挤出机三维流场为研究目标，研究内容包括速度场、压力场、剪切速率场等。
Softwares ANSYS and MATLAB were employed to analyze and simulate the velocity, pressure and shear stress distribution in sheet extruder dies based on the three-dimensional FEM.
利用ANSYS和MATLAB软件，对缩放型片材机头中熔体的速度、压力和剪切应力的分布进行三维有限元模拟和分析。
A integration collection system of hydraulic engineering system is developed in order to check on line the parameters such as velocity, pressure, flow-detecting and so on in hydraulic facilities.
为了对液压设备中的速率、压力、流量等参数进行在线检测，我们自行设计了一套液压工程综合采集系统。
The tube inlet throttle has great influence on the time space distributions of the gas velocity and pressure.
身管入口节流对燃气流速和压力的时空分布产生重要影响。
The dynamic vibration of hydraulic system is characteristic of instantaneous velocity, pressure and its oscillation.
液压系统动力学振动程度可用瞬时速度、压力和压力脉动描述其特性。
The dynamic vibration of hydraulic system is characteristic of instantaneous velocity, pressure and its oscillation.
液压系统动力学振动程度可用瞬时速度、压力和压力脉动描述其特性。
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