Arca Regler has developed two new pneumatically activated actuators, the company’s smallest and largest products so far.
On the small end of the scale, the PP-1.3 features a diaphragm surface of only 8.68sqin, while the PP-130 offers a 434sqin diaphragm surface.
The PP-1.3 is fully welded, made from stainless steel and especially designed for smaller nominal widths DN25-50 with a valve stroke of 16-20mm.
Despite its small actuator surface, the PP-1.3 reaches a control force of 1.3kN, with the Arca interface for direct mounting of Arca positioners integrated in the actuator yoke.
The PP-1.3 is designed for the use in the beverage and food as well as in the chemical industry.
PP-130 is a piston actuator that can, depending on the application, perform as both single-acting with spring return or double-acting with and without spring return.
The actuator reaches control forces up to 129kN, with a stroke range between 180 and 250mm, which makes it adequate for control valves in the DN500-700 size range.
Such valves are used, for example, in the bypass range of huge compressors protecting gas turbines.
In order to reduce construction height, in the double-acting actuator the pressure spring has been integrated into the pressure chamber.
Compared to the previous design, the control time could be reduced to <2 seconds and the overshoot could be reduced to half value at equal setting time.