Knowledge Church: Regulating The Flow Of Liquid Medium Pressure Valve - Control Valve, Valve - Pump

HC Valve Network: Regulating valve for regulating media flow

, pressure and liquid level. According to the signal conditioning parts, automatic control valve opening to achieve the medium flow rate, pressure and level of regulation. Sub-electric control valve control valve, pneumatic control valve and hydraulic control valve

Electric control valve is the industrial automation process control instrumentation in the major execution units. With the industry growing degree of automation, is being more and more applications in various industrial fields. And compared to the conventional pneumatic control valve has obvious advantages: energy efficiency (power consumption only when at work), environmental (non-carbon emissions), quick and easy installation (no complicated piping and pump station pneumatic).

Pneumatic control valve is driven by compressed air source to the cylinder as the actuator and valve positioner by means of electrical, switches, solenoid valves, valves and other accessories to secure his position to drive the valve, the amount or proportion of switched type regulation, industrial automation control system receives the control signal to complete the conditioning medium pipe flow, pressure, temperature and other parameters. Pneumatic control valve is characterized by simple, responsive, and intrinsically safe, explosion-proof measures to be taken without an additional

Automatic control valves can be traced back Self-valve, which includes a spherical valve with a heavy rod, heavy force to balance the spool to be some degree of regulation, and the other early The Self-Wen in the form of surge pressure balanced pressure regulator. Process pressure regulating valve with a pipe receiving spring film chamber on the film. Whether reducing valve, the valve differential pressure type pressure regulator or regulators are document enough base valve from this change and created

Cv flow capacity is to select one of the main parameters regulating valve, control valve flow capacity is defined as: when the control valve fully open, the valves at both ends of the pressure difference of 0.1MPa, fluid density 1g/cm3, each hour flow path control valve of the flow number, called the flow capacity, also known as the flow coefficient to Cv, said unit t / h, liquid Cv value calculated as follows.

Cv flow capacity according to the value of the size of look-up table, to determine the control valve nominal diameter DN

Control valve flow characteristics, is a constant pressure differential across the valve under the conditions of medium relative traffic flows through the valve and the relationship between its opening. Control valve flow characteristics are linear features, such as the percentage of properties and characteristics of three kinds of parabola. The significance of three flux characteristics are as follows:

(1) parabolic characteristic Flows, the second side is proportional to the itinerary changes, generally linear and equal percentage characteristics with intermediate characteristics.

(2) linear features (linear) Linearity and the relative stroke linear relationship between the relative flow. Unit change in itinerary changes caused by the flow is constant. Traffic flow, the flow rate changes relative small traffic hours, the flow of large changes in relative value.

(3) the percentage of properties such as (log)

Features such as the relative percentage of travel and not a linear relationship between the relative flow, every point in the trip unit trip caused by changes in traffic flow changes and this is proportional to the percentage change in flow rate are equal. So it has the advantage of traffic hours, traffic changes in small, large flow, then the flow rate changes, that is, different openings on the same regulation accuracy.

From the analysis of the three characteristics can be seen speaking on the performance of its adjustment to the percentage of properties such as optimal, the regulator stability, regulated performance. The parabolic than linear characteristics of the regulation characteristic of good performance, can use the occasion of the requirements are different, select any of these flow characteristics.

by: gaga

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