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# How to calculate the torque of a forged steel ball valve

Update:22-12-2018
Summary:

The torque calculation of the forged steel ball valve i […]

The torque calculation of the forged steel ball valve is as follows: the square of the valve diameter of the one-half of the valve is 3.14, which is the area of ​​the valve plate, and then the static pressure accepted by the shaft is obtained by the pressure of the stainless steel ball (ie the working pressure of the valve). Multiply the stainless steel ball friction coefficient of the bottle (to check the table, the friction coefficient of steel is usually 0.1, the friction coefficient of steel to rubber is 0.15), multiply the shaft diameter by 1000 to obtain the torque of the valve, the unit is cow·m, The reference safety value for electric equipment and pneumatic actuators is 1.5 times the torque of the valve.

When designing the valve, the Carbon Steel Ball actuator for hinges is budgeted and divided into three parts:

1. Collision torque seen by the seal (ball and seat)

2. The conflicting moment of the filler on the valve stem

3, the collision torque of the bearing to the valve stem

Therefore, the accounting pressure is usually 0.6 times the nominal pressure (about the working pressure), and the conflict coefficient is determined according to the material. The calculated torque is multiplied by 1.3 to 1.5 times to select the actuator.

The valve torque calculation should coordinate the conflict between the valve plate and the valve seat, the conflict between the valve shaft and the packing, and the thrust of the valve plate under the pressure difference of the medium.

Due to the variety of valve plates, valve seats and packing, each has a different conflicting force, as well as the size of the touch surface, the degree of compression and so on. Therefore, it is usually measured by appearance rather than accounting.

The value calculated by the valve torque has a great reference meaning, but it cannot be completely copied. Under the influence of many factors, the valve torque calculation has not been tested with more accurate results.