Choose the regulator, the first to collect a complete process of fluid physical properties parameters and regulator of the working conditions, the main composition of fluid, temperature, density, viscosity, normal flow, maximum flow and minimum flow, maximum flow and minimum flow of import and export pressure, maximum pressure. Technology in the major control and determine the structure of the regulator itself, flow characteristic, Kv rated flow coefficient value, diameter size, process allows the differential calculation and selection of the actuator, the content of the material and installation, etc. Choose regulator with general should follow the principle of has the following several points. A regulator structure: should be able to meet the medium temperature, pressure, liquidity, flow, and the adjusting range and rigor request. The flow characteristic of regulating valve: should be able to meet the reasonable compensation system characteristics. Regulating valve of flow characteristic refers to the relative flow medium through the valve and stem the relationship between the relative displacement, mathematical expression is as follows: Q/Qmax = f ( l/L) , Q/Qmax as relative flow type, for regulating Industrial Valves in an opening when the ratio of the flow Q to fully open flow Qmax; L/l as the relative displacement, the regulator in a when opening the Industrial Valves core displacement and the ratio of the displacement of full open l l.

choose the flow characteristic of the general principle is that the regulator shall be the adjustment object properties and regulator characteristic, on the other hand, this can make the control system of comprehensive properties close to linear. Alternative flow characteristic in the process is usually under system requirements, but also consider the following situation.

1, the linear flow characteristic scope of application:

(1) the differential change small, almost constant;

(2) process the change of the main parameters of a linear;

(3) most system pressure loss allocation on the regulator ( The opening of the change to change differential pressure valve is relatively small) ;

(4) external disturbance is small, given value change is small, small adjustable range of requirements.

2 percentage, and other characteristics, scope of application:

(1) the actual wide adjustable range;

(2) the opening change, the valve differential pressure changes in a relatively large;

(3) pipeline system pressure loss;

(4) process system load fluctuation significantly;

(5) the regulator often run in a small open degrees.

3, in addition to the above two common flow characteristic, and parabola and open characteristics, and other flow characteristic of regulating Industrial Valves. Three: the calibre of the valve should be able to meet the requirements of the process of flow. According to the known condition of fluid, calculate the necessary Kv value, choose suitable valve diameter.

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