It is a positive displacement vacuum pump, which can pump gas by rotating slide valve to change cubage of gas- absorbing cavity.

它是通过滑阀转子作机械旋转运动从而改变吸气腔容积以达到抽气目的的容积式真空泵。

However, most of these commercial building are using positive displacement hot water supply equipments, and most of these equipments use electricity as their heat sourse.

然而这些商用建筑中目前普遍使用的基本上都是容积式的热水供应设备，许多是以电做为热源的。

Twin-screw pump as a positive displacement pump, pump room exhaust inhalation chamber should be strictly separated.

双螺杆泵作为一种容积式泵，泵内吸入室应与排出室严密地隔开。

The timing pump is a positive displacement pump set to ensure that product flows through the entire system at a predetermined and acceptable rate.

这种调速泵是一个容积式泵，用来确保产品以确定的可接受的速率流过整个设备。 收藏。

By developing a unique positive displacement system along with a special two part epoxy, this system reduced labor by 95%, increased productivity by 40% and eliminated all environmental impacts.

通过开发一种带有特殊环氧的积极位移系统，该系统减少了95％的劳动力，增加了40％的生产力，同时消除了所有环境影响。

Refrigerating systems and heat pumps - Safety and environmental requirements - Positive displacement refrigerant compressors.

制冷设备和热泵。安全和环境要求。容积式制冷剂压缩机。

Double screw pump as a positive displacement pump, the pump suction chamber should be closely separated and discharge chamber inside.

双螺杆泵作为一种容积式泵，泵内吸入室应与排出室严密地隔开。

Our positive displacement pumps with exhaust silencer and inlet and outlet filters assure you top notch reliable performance.

我们的带有排气消声器和进出口过滤器的正排量泵为您保证顶端缺口的可靠性能。

Screw pump is a positive displacement rotary pumps, when the export side blocked after, the pressure will gradually increase, so that the pressure exceeds a predetermined value.

螺杆泵是一种容积式回转泵，当出口端受阻以后，压力会逐渐升高，以至于超过预定的压力值。

The valve-controlled energy recovery device (VC-ERD) designed in our research project is of the positive displacement type. It uses valves and cylinders to accomplish the energy exchange process.

本文工作中设计和研究的阀控余压能量回收装置（VC-ERD）即采用正位移式原理，利用阀和水压缸来实现能量交换。

Petroleum and natural gas industries - Rotary-type positive displacement compressors - Part 1: process compressors (oil-free).

石油和天然气工业。旋转型容积式压缩机。第1部分：加工压缩机（无油）

When ready to start centrifugal pumps, fully open suction valves and throttle discharge valves of a positive displacement.

当准备好启动离心式泵时，吸入阀全开，容积式排出阀节流。

The characteristics of positive displacement flow meter are introduced, and the main factors for lectotype and the matters needing attention in the application are discussed.

介绍了容积式流量计的特点，探讨了选型的主要因素和应用的注意事项。

The consecutive life of the positive displacement motor depends on its main shaft bearing assembly, but the assembly is a weak point.

螺杆钻具主轴轴承总成是螺杆钻具的薄弱环节，对整个螺杆钻具的使用寿命起决定性作用。

Positive displacement motor is widely used in sidetrack drilling inside casing because of its excellent dynamic characteristic.

由于螺杆钻具本身具有良好的动力特性，在套管内侧钻中得到广泛应用。

The characteristics of internal gearing for a pair of stator and rotor on positive displacement motors (PDM) are introduced.

应用齿轮啮合理论，建立了螺杆马达定子与转子工作副的通用共轭线形方程。

This paper presents that there are two ways on the development of the positive displacement pump.

本文提出容积泵在发展中存在“常规发展”与“机构突破”两种途径。

Calculation results show that greater friction force exist between drill stem and wall of bore in tripping out and drilling using PDM (positive displacement motor) working conditions.

计算结果表明，起钻和井底动力钻具钻进两种工况，钻柱与井壁间有较大的摩擦力。

The plasticating and conveying process can be obtained with the volume change of the cavity with specific shape, the process shows the character of positive displacement and high efficiency.

塑化输送靠特定形状的空间容积变化完成，具有完全正位移特性，效率提高；

The same powerful positive displacement blower technology used in large truck mounted vacuums is employed in the SAVE-YOUR-BACK-VAC.

吸尘器上还使用了同样强大的正排量鼓风机技术。

Positive Displacement pumps are used to move liquids or compress gases. They operate on a what goes in, must come out principle.

正排量泵用于去除液体和压缩空气。他们的工作原理是“有进需有出”。

Because all oil pumps are positive displacement types, a pressure regulator valve must be used as a safeguard against excessively high oil pressures in the lubrication system.

以为所有的机油泵是容积泵，必须使用压力调节阀，防止在润滑系中机油压力过高。