Stem diameter: For multi-rotation rising stem valves, it cannot be assembled into an electric valve. For the concealed stem valve in part-turn valve and multi-turn valve, although it is not necessary to consider the problem of the diameter of the stem, but the diameter of the stem and the diameter of the keyway should also be fully considered in the selection. , so that it can work properly after assembly.
Output speed: If the speed of opening and closing the valve is too fast, water hammer is easy to occur. The appropriate opening and closing speed should be selected according to different usage conditions. The electrical installation of this valve has special requirements, that is, it must be able to limit the torque or axial force. The determination of the technical indicators of the electrical transmission equipment, its control torque is also determined. Generally speaking, the motor is not overloaded by running at a predetermined time. However, if the following conditions occur, overload may be caused: First, the power supply voltage is low, and the required torque cannot be obtained, thereby causing the motor to stop rotating; The third is the accumulation of heat during intermittent use, which exceeds the allowable temperature rise of the motor; the fourth is that the circuit of the torque limiting mechanism fails due to some reasons. Excessive torque.
