Operating torque for soft-seal floating ball valves is based on room temperature, cleaning media. For high temperature, low temperature conditions and non-cleaning media, will lead to increased valve operating torque. The table below shows the operating torque of the soft-sealed floating ball valve for selection of the drive. Nominal diameter (mm) Operating torque of soft seal floating ball valve (Nm) 1.6MPa 2.5MPa 4.0MPa 6.3MPa 10.0MPa 15 5 6 8 15 18 20 7 8 12 25 31 25 12 14 24 42 55 40 25 30 40 75 120 50 35 50 62 92 160 65 55 320 80 - - 880 - - 1760 - Opening and closing process, the required opening and closing force and opening and closing torque is changing, the maximum value is the closure of the final instantaneous or open the first instant. There are special requirements for the opening and closing speed of some special conditions. Valve torque calculation is: One-half of the square of the valve diameter × 3.14 is the area of ​​the valve plate, multiplied by the pressure (that is, the valve working pressure) obtained by the static pressure shaft, multiplied by the friction coefficient (To find the general steel friction coefficient to take 0.1, the friction coefficient of steel to rubber 0.15), multiplied by the shaft diameter divided by 1000 to obtain the valve torque, in units of cattle meters, electric devices and pneumatic actuator reference safety 1.5 times the value of the valve torque.
Led Area Light,200W Led Area Light,Led High Area Light,Dlc Area Lights
Fuonce-Lighting , https://www.fuoncelightings.com