Hydrodynamic calculation Butterfly valve lenticular disc $s/D=0.16$
Values for calculation
Calculation
Velocity in valve
Theoretical pressure in the valve at full opening
Pressure parameter
Effective closing time factor
Under-pressure behind the valve
Angle from open position |
Flow coefficient |
Coefficient of hydraulic force on a disc in the axis x |
Coefficient of hydraulic force on a disc in the axis y |
Coefficient of hydraulic force on body in the axis x |
Coefficient of hydraulic force on body in the axis y |
Hydraulic torque coefficient |
---|---|---|---|---|---|---|
$α$ | $K_Q$ | $K_x$ | $K_y$ | $K_{bx}$ | $K_{by}$ | $K_m$ |
$\mathrm{°}$ | $\mathrm{ }$ | $\mathrm{ }$ | $\mathrm{ }$ | $\mathrm{ }$ | $\mathrm{ }$ | $\mathrm{ }$ |
No data |
$K_y \mathrm{[-]}$
$K_{bx} \mathrm{[-]}$
$K_{by} \mathrm{[-]}$
No data |
No data |
No data |
Angle from open position |
Loss coefficient |
Angle between pipe axis and hydraulic force |
Reduced free flow area in the throttle control system |
Relative flow |
Flow of water in the pipeline |
Water velocity in pipeline |
---|---|---|---|---|---|---|
$α$ | $ζ$ | $φ$ | $f_r$ | $Q_p$ | $Q$ | $v$ |
$\mathrm{°}$ | $\mathrm{ }$ | $\mathrm{°}$ | $\mathrm{ }$ | $\mathrm{ }$ | $\mathrm{m^3/s}$ | $\mathrm{m/s}$ |
No data |
No data |
No data |
$Q_p \mathrm{[-]}$
No data |
$v \mathrm{[m/s]}$
No data |
Angle from open position |
Loss of pressure on the valve |
Pressure on the valve |
Cavitation number |
---|---|---|---|
$α$ | $H_L$ | $H_v$ | $σ$ |
$\mathrm{°}$ | $\mathrm{m}$ | $\mathrm{m}$ | $\mathrm{ }$ |
No data |
$H_v \mathrm{[m]}$
No data |
No data |
Angle from open position |
Forces on disc in axis x |
Forces on disc in axis y |
Forces on disc |
The force at the valve axis x |
The force at the valve axis y |
---|---|---|---|---|---|
$α$ | $F_x$ | $F_y$ | $F$ | $F_{bx}$ | $F_{by}$ |
$\mathrm{°}$ | $\mathrm{kN}$ | $\mathrm{kN}$ | $\mathrm{kN}$ | $\mathrm{kN}$ | $\mathrm{kN}$ |
No data |
$F_y \mathrm{[kN]}$
$F \mathrm{[kN]}$
No data |
No data |
No data |
Angle from open position |
Hydraulic torque without eccentricity |
Hydraulic torque |
---|---|---|
$α$ | $M$ | $M_H$ |
$\mathrm{°}$ | $\mathrm{kNm}$ | $\mathrm{kNm}$ |
No data |
No data |
No data |
Angle from open position |
Coefficient of under-pressure of aerated hole |
Under-pressure in the aerated pipeline |
Air flow |
---|---|---|---|
$α$ | $f_{air}$ | $p_{air}$ | $Q_{air}$ |
$\mathrm{°}$ | $\mathrm{ }$ | $\mathrm{Pa}$ | $\mathrm{m^3/s}$ |
No data |
No data |
No data |
No data |
Angle from open position |
Air velocity |
The flow area of the aerated hole |
The flow area of the aerated pipeline |
---|---|---|---|
$α$ | $v_{air}$ | $A_{air}$ | $A_{air-pipe}$ |
$\mathrm{°}$ | $\mathrm{m/s}$ | $\mathrm{m^2}$ | $\mathrm{m^2}$ |
No data |
No data |
No data |
No data |