Devices and systems for double-acting pneumatic actuator mechanisms. A system for controlling a double-acting pneumatic actuator is configured to generate two control signals, one for each of the two pneumatic chambers, in order to control the actuator position according to operational constraints of actuator chamber pressure or stiffness. The numerical index of stiffness can be calculated in various ways, for example, it is the average of the two-chamber pressures. In one embodiment, the numerical index of stiffness is taken as the output of the system and the position of the actuator. A multiple-input multiple-output control loop with position and pressure feedback can be used to control the position and stiffness of the actuator simultaneously.
When using a double-acting actuator mechanism, first determine the torque of the valve, and increase the safety value of water vapor or non-lubricating medium by 25%; increase the safety value of non-lubricating dry gas medium by 60%; increase the safety value of granular powder medium conveyed by non-lubricating gas 100%; for clean and frictionless lubricating medium, increase the safety value by 20%, and then consult the torque table according to the working pressure of the air source to obtain an accurate actuator model. For example, choose a double-acting gas turbine: the air supply pressure is only 5bar, and the ball valve requires a torque of 20On. M is controlled, and the medium is non-lubricating water vapor. Taking into account the safety factor, an increase of 25% is equal to 250N. M First find the supply air pressure of 5bar according to the table, then vertically find the supply air pressure equal to or along the column For similar torque data, choose 272n. Follow this line to find the model on the left and select the GT130. Choose single-acting (spring return), for example, the air supply pressure is only 4bar, and the butterfly valve needs a torque of 100N. M is a controlled medium, and the medium is non-lubricated dry gas. Taking into account the safety factor, an increase of 60% is equal to 160n. M First, find the endpoint of the whistle reset according to the table for a similar torque of 166n. Then follow the line on the left to find the end torque of 4bar, 196N. The air supply pressure torque should be greater than the spring return torque. When the air pressure torque is greater than the spring return torque, look up the model along the left side of the line, choose gt160s, and the ammunition reserve is 10.
