Can the quarter turn actuator DRD (Copar) be converted from double to single-acting?
A double-acting Copar DRD can be converted from double to single-acting by installing springs. There are special springs for every actuator size, with the right size and spring rate. The number of springs can be determined using the torque tables for single-acting quarter turn actuators DRE-xx-xx in Info 910. The first step is to undo the screws and remove the cover. Then the springs are installed. Careful attention needs to be paid to the positioning of the clockwise rotating and anti-clockwise rotating springs on the pistons. When screwing the cover back on afterwards, the screws must be tightened evenly in a criss-cross pattern to prevent tilting.
