The backing pressure of seal changed, in the mean time clean gas supply is changing accordingly to keep constant different pressure between seal gas supply and backing pressure. This will ensure a stable working environment of DGS.

1、

Introduces the newly developed K-800A HV oil diffusion pump for its design of broadened range of pumping speed, increased critical backing pressure and reduced backstreaming rate.

介绍了新研制的高真空油扩散泵在拓宽抽气速率范围、提高临界前级压力、降低返油率方面的创新设计。

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2、

Grade. Calculation of Critical Backing Pressure and Diffuser Throat Diameter of Oil Vapour Pump

油蒸汽流泵的临界前级压力及扩压器喉部直径的计算

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3、

In addition, when the strain was equal, backing pressure could significantly lower the rate of cavity.

在相同的应变时，背压的加载能显著降低空洞的体积分数。

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4、

The third one, tbe backing pressure type, is based upon the other two types.

第三组&背压式结构是在前二组密封部件基础上改进而成的。

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5、

Exploration of the Influence of Backing Pressure on the Efficiency of Hydraulic Motor

背压对液压马达效率影响的探讨

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6、

The Experiment of Improving Backing Pressure to Control Expansion Error

提高背压在控制胀差中的尝试

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7、

The methods that can be used are: improve the cope hole; deal with the backing strip used for beam flange; strict the requirements for welding; reduce welding defects; remove the cracked parts; partial substitution of components.

采用的方法有：改进焊接工艺孔、对梁翼缘焊接垫板进行处理、严格焊接工艺要求，减少焊接缺陷、清除含裂纹部分、构件部分替换。

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8、

Cause Study of Porosities Formation in Semiautomatic CO_2 Arc Welding by One Side with Ceramic Backing Strip PROTECTION OF MARINE SHIPS: STATE OF THE ART IN CHINA

船舶焊接CO2气体保护单面焊气孔成因探讨

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9、

Evaluation and Discussion of Root Flaw of Welded Joint with Backing Strip

射线底片上带垫板单面焊缝根部缺陷的识别探讨

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10、

The ECB's backing for a centralised register – updated daily or even more frequently – could reinvigorate the debate among global regulators about how best to deal with the risks posed by highly leveraged hedge funds.

欧洲央行对汇总式注册簿（更新频率为每日一次，甚至更高）的支持，可能在全球各监管机构中重新引起争论，即如何最好地应对由大量采用杠杆工具的对冲基金造成的风险。

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11、

The outlet pressure of all those pumps were not lower than 0.1 Torr, and it follows that those pumps can run well by using directly the mechanical vacuum pumps as backing pumps without booster pump used.

所有这些泵的最大出口压力不低于0.1Torr，因此前级泵可直接用机械真空泵，不必用增压泵即能正常工作。

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12、

In the multistation exhaust system a mechanic pump is used as the backing pump and molecular pump as the main integral part to form a high vacuum system.

由机械泵为前级泵，分子泵为主抽泵构成高真空系统，对高压开关管进行真空排气；

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13、

Analysis to the Back Swing Motion of the Backhoe Bucket Rod of Hydraulic Excavator and the Resolvent

液压挖掘机反铲斗杆回摆运动问题分析及解决方法

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14、

The specific operating sizes and the digging path enveloping drawing for hydraulic excavator with backhoe attachment

液压挖掘机反铲装置特殊工作尺寸及挖掘轨迹包络图

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15、

This paper briefly introduces the dredging system of the total hydraulic backhoe dredger designed and built for Burma, emphasizes on the working principle of the triple dolphin mooring system, the structure model of leg elevating device, its elevating and ship shifting method.

本文简要介绍出口缅甸的全液压反铲挖泥船的挖掘系统，特别是三桩定位系统的原理、桩腿升降机构的结构型式及其升降、移船操作方法。

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16、

Such as hydraulic backhoe attachment a 12-bar mechanism with three oscillating cylinder, if you use the above method, the process of operation will be very simple.

例如对于液压挖掘机反铲装置&三摆缸12杆机构，应用上述方法其过程十分简单。

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17、

Establishes a mathematical model by means of transformation matrix method and compiles the software system "WJJ" for the optimization of backhoe working mechanism of excavator.

本文应用变换矩阵建立了挖掘机反铲传动机构的数学模型，并编制了进行优化设计计算的软件系统WJJ。

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18、

This paper presents a method of innovative design for backhoe device of hydraulic excavator.

本文结合液压挖掘机构中反铲装置，提出一套创新设计方法。

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19、

Finite Element Dynamic Analysis on Working Equipment of Backhoe Single Bucket Hydraulic Excavator

液压反铲挖掘机工作装置有限元动态分析

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20、

One of the researches of the bucket bearing region of single bucket backhoe hydraulic excavator 《 The sign Description of the Excavating Range and the Division of Regions 》

单斗反铲液压挖掘机铲斗方位域研究之一&《挖掘范围的标记描述和区域的划分》

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