The choice of valve drive is based on: 1) The type, size and structure of the valve. 2) The opening and closing torque of the valve (pipe pressure, maximum pressure difference of the valve) and thrust. 3) Maximum ambient temperature and fluid temperature. 4) Usage and usage times. 5) Opening and closing speed and time. 6) Stem diameter, screw moment, direction of rotation. 7) Connection method. 8) Power source parameters: electric power supply voltage, phase number, frequency; pneumatic air supply pressure; hydraulic medium pressure. 9) Special considerations: low temperature, corrosion protection, explosion protection, waterproof, fire protection, radiation protection, etc. In all valve drives, electric and diaphragm pneumatic devices are the most widely used. Electric devices are mainly used in closed-circuit valves; diaphragm-type pneumatic devices are mainly used in regulating valves. Electromagnetic transmission is mainly used for small-diameter valves. The built-in bellows transmission is mainly used in valves with small valve strokes and corrosive and toxic media. However, its range of use is often limited by the auxiliary pilot device that controls the main transmission. A special requirement for the valve drive is that it must be able to limit the torque or axial force. The valve actuator uses a torque-limiting coupling. In hydraulic and pneumatic drives, their maximum force depends on the effective area of ​​the diaphragm or piston and the pressure of the drive medium. Springs can also be used to limit the force transmitted. Titanium Welded Tube,Titanium Welded Pipe,Titanium Pipe Welding,Titanium Welded Tubes SHAANXI LASTING TITANIUM INDUSTRY CO., LTD. , https://www.lastingtitanium.com
The choice of valve drive method to learn together
ã€Print】 ã€Close】