ACTUATION SYSTEM FOR AN INTERNAL BACKUP RING ASSEMBLY

摘要

An actuation system for a clamping assembly for use in a pipe clamping apparatus, including a shaft and an actuator defining an actuator chamber having a peripheral chamber wall. The actuator is movably mounted about the shaft such that the shaft extends through the actuator chamber and the actuator is longitudinally reciprocable thereon. A piston is fixedly mounted about the shaft and positioned within the actuator chamber. The piston has first a nd second sides and an outer perimeter sealingly engaging the peripheral chamber wall to create fir st and second chambers such that the actuator reciprocates along the shaft in response to a differential force applied within the first and second chambers. The clamping assembly is associated with the actuator such that reciprocation of the actuator along the shaft causes the clamping assembly t o move radially relative to a longitudinal axis of the shaft.