How to Choose Valve Gearbox?
This article we talk about how to choose the gear box model, then you can choose the right product.
Manual gearbox selection
1, Confirm the valve torque, plus safety factor (general * 1.3 or 1.5), select the gearbox model larger than this torque.
2, Check following information:
A, Stem diameter is beyond the maximum allowable size of the gearbox, if exceeded, according to the stem diameter size to select the gear box model. If it’s rising stem valve, determine the thread standard and size. If the keyway is connected, determine the number, size and location of the keyway.
B, If the connection size between the valve and the gearbox is inconsistent, the two manufacturers negotiate a solution to achieve supporting production. Now commonly used is the international ISO5211 / 5210 standard.
3. Other special factors: shell material selection,protection level, open direction (conventional counterclockwise open), paint color, protective cover size, packaging requirements.
Electric gearbox selection
1,When the valve torque is too large need to choose the appropriate gearbox to transition. First we need to select the gearbox model according to the valve,then to calculate the required speed ratio of the gearbox based on the valve torque, electrical torque, and gearbox efficiency. (generally the ratio of single-stage gearbox can’t be changed, two-stage gear box can be changed).
2, Calculate the valve opening and closing time according to the speed,ratio and number of valve stem revolutions, not more than 15 minutes.
Or you can provide information of valves, electric actuator to the gearbox manufacturers, then the engineer will choose a suitable model for you.