Introduces the working principle, characteristics and install requirement of hidden throttling device.

Modeling and validation of high speed and large flow cartridge proportional throttle valve

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.