The conventional oriffice flowmeters, though accurate enough to meet such standards as GB2624-81 and SYL04-83, practically fail to reach their precision due to unqualified design, fabrication, installation and application of the restriction devices.

Welding of throttle device made from 10CrMo910 steel;

In a case of the throttle device of a main steam pipe explored after service for less than one year,through the failure analysis,it was found that the main reason for the explosion of the throttle device was the misuse of material which resulted in the insufficient strength of the material under the running temperature and pressure and consequently resulted in the static load fracture.

In the present research, numerical simulations and calibration experiments are done on throttle devices such as orifice-plate, v-cone, and spindle.

With the introduction of the present situation and the characteristic of the differdnce pressure flow-meter application,this article analyzes the throttling gear development condition,and carries on the analysis to the throttling gear standardization research present situatio

A new method about the standard throttling set on-line iterative measurement is proposed,that is based on flow measurement using the traditional standard throttling set.

This paper introduces a new type of throttling set for flow measurem en t-V type internal cone throttling set.

A pressurized control system is present with schematic diagrams and design formulas,as well as the throttling set in this paper.

On measuring the flow capacity of the pipeline gases(air, steam and gas), based on the traditional throttling devices, industrial computers are used as the main tools in signal collecting and calculating, data man- agement,data delivery and data printing.