Pneumatic actuator with positioner type AC-CP
USA-type 759-TLDA direction „Air to close–ATC“
The type AC-CP is an actuator with an integrated pneumatic positioner TLDA especially constructed as a compact extension for the Research Control® valves. The positioner TLDA (Top Loaded Direct Action) ensures a fast and precise regulation by its high positioning precision that can be kept independent of the changing media pressures. This actuator should be used if higher shut off forces are required at same input signal of 0.2 – 1.0 bar, due to influences like e.g. friction of the packing or media pressure.
The TLDA positioner is based on the force compensation method. Every position of the valve equates to a definite force on the spring. In an unbalanced state, the supply air is directed behind the diaphragm, until a balanced state is reached. The positioner ensures that the valve position is always directly related to the instrument signal. This is obtained by constantly comparing the control signal 0.2 – 1.0 bar with the travel of the valve.