压力

Recommended National Standards GB/T12243-2005 "spring load safety valve directly," provides a safety valve discharge pressure should not exceed 1.1 times the setting pressure or 1.2 times the setting pressure.

推荐性国家标准GB/T12243-2005《弹簧直接载荷式安全阀》规定，安全阀的排放压力应不超过1.1倍的整定压力或1.2倍的整定压力。

When the external control pressure increases to the shutoff pressure setting point of the valve, the external control pressure acting on the underside of the diaphragm, which breaks the balance of the compression of the pressure spring and the latch lever, triggers the latch and disengages valve disc arm from the latch.

当外接控制感应压力﹝即减压下游压力﹞升到此阀关断压设定点时，控制压作用于皮膜下层破坏压力弹簧压缩与闩杆间的平衡，然后扳开闩扣并从闩扣释放阀门封盘。

Then the influence of flow, pipe length, setting pressure of relief valve and stiffness coefficient of main valve spring on the water hammer peak pressure at the instant of fuel pistol closing was studied according to the detected pressure signals. Finally, the relatively accurate gas-liquid separation value and critical cavitation pressure value of the system was obtained by frequency analysis and wavelet analysis.

根据测得的压力信号，对燃料枪关闭瞬间流量、管长、溢流阀调定压力以及主阀弹簧刚度对水击效应引起的峰值压力的影响进行研究，并通过频率分析方法和小波分析方法较精确地获得系统的气液分离值和临界汽蚀压力点。

Centrifugal pump flow rate as a pressure change much, while the volume of pump flow rate as a pressure change was small, and the centrifugal pump shaft power decreases with the head of the law to improve the contrary, the volume of the pump shaft power with the pressure increase and increase.

离心泵流量随压力改变很大，而容积泵流量随压力改变却很小，与离心泵的轴功率随扬程提高而减小的规律相反，容积泵的轴功率随压力的提高而增大。

Fluidization and Sounding Pressure Characters Experimental Research on Pulsating Fluidized Bed After verifying experimentally the Rijke type self-exciting pulsating fluidized bed combustion, under different operating conditions (different empty cross-section wind speed and inaction bed height), experimental research the oscillation characters of sounding pressure in the pulsating fluidized bed. The results indicate that the sound characters in the Rijke type self-exciting pulsating fluidized bed combustor are the same with it in the Rijke type combustor, the pressure in the combustor oscillate up and down in the sinusoidal manner and the pressure is the superposition of the multiple harmonic waves.

脉动流化床流化与声学压力特性实验研究在实验验证了Rijke型自激脉动流化燃烧概念后，在不同运行条件(空截面风速、静止床层高度)下，实验研究了Rijke型自激式脉动流化床的声压振动特性，研究结果表明：脉动流化床内建立起的声波特性和Rijke型脉动燃烧器内的一样，各点压力呈正弦规律上下振动，且压力是基波幅值最大的多次谐波的叠加。

At initial time the core is saturated by oil or water,and put the core into a sample holder with two pressure transducers at ends;Then make the core in a high pressure condition and shut-in the ends of holder;After the pressure of core is steady,open one end of holder to one certain pressure,in the same time, measure the pressurd of sealed end,until attain to another balance state.

设计实验方法为：初始时刻，将岩心在高压下饱和原油，在一端封闭，并装入测压计，待系统压力平衡且稳定后，将岩心另一端放空至某一压力值，连续测量封闭端压力变化，直至系统达到稳定状态。

This research is very important to improve the safety of high arch dams against strong earthquakes. It provides science references for design of high arch dams and technical guidance for taking steps to reduce hydrodynamic pressures and dynamic responses of high arch dams in earthquakes.

研究了拱坝在强地震中的动水压力和降低动水压力的气幕隔震技术，对提高拱坝的抗震安全性具有重要的科学意义和实际价值，对高拱坝的抗震设计和采取工程措施减小动水压力提供理论依据和技术指导。

In the light of the relation between rock velocities and confining pressure and pore pressure, the concept and formula of effective pressure is cleared in this thesis.

本文针对岩石的弹性波速度与围限压力和孔隙压力的关系，澄清了有效压力的概念和计算公式。

Summary : Pressure relief valve and pressure reducing valve sometimes adjust to press out of order in the usage process , this is mainly because of block of damp finestra of the valve element or pilot valve .

溢流阀，减压阀这两种压力控制元件在液压设备中用处很广泛，溢流阀作用是调节系统压力，减压阀作用是减少某一支路的压力。

The concise control scheme and particular control algorithms employed are illustrated in detail, which mainly include pressure piecewise control for heat pump group and the low-point selection control for heat pump actuator, the pressure piecewise control for low-temperature dryer of Wet paper sheet, the pressure split control for the secondary steam recovery of oven and the cascade control for paper sheet moisture.

简要介绍纸幅干燥原理和热泵节能机理，设计一套基于S7-300 PLC的五叠网涂布白板纸机蒸汽冷凝水热力控制系统，阐述具体的控制方案和采用的控制算法，其中主要包括热泵组的压力分段控制和热泵开度的低端选择控制、湿端低温段烘缸组压力回路分段控制、热烘箱二次蒸汽回收压力回路的分程控制和成纸水分的串级控制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。