Flowrox control valves are designed for demanding control applications in which conventional valves encounter problems with wear due to increased turbulence. Controllability can be further improved with conical sleeves (reduced ported for the exact Cv required) or smart positioners. Elastic sleeves have been applied for improved wear resistance.
Each valve can be sized and optimized for the optimal control range, to limit wear and velocity and also to prevent cavitation from occurring in the control valve.
Flowrox control valve sizing is based on international IEC60534 standard (harmonized with ANSI/ISA S75 standards). The valve flow coefficient Cv defines the control valve flow capacity i.e. the valve size (diameter).
The optimal control range of the Flowrox valve is between 10-50 % of opening. Flowrox offers the accurate control and the longest service life time in the most demanding slurries.
Flowrox has a control valve sizing program to ease your work.
Control valve’s flow coefficient Cv – and thus the valve size – is a result of process conditions.
Q = Flow rate (m3/h) G = Specific gravity (-) ∆p = Pressure drop over the valve (bar)
N1 = Numerical constant (SI or US units) FP = Piping geometry factor (-) FR = Reynolds number factor (-) .
Control valve sizing and selection is result from process conditions. Namely, flow rate range, slurry specific gravity (s.g.) and pressure difference over the valve defines the valve flow coefficient range (Cv), for which a control valve is sized and selected.
Cost-effective =Reliable operation + Predictive maintenance +Sizing program helps to choose the correct valve +Equipment optimized to your process.