DUAL PISTON ACTUATOR

摘要

DUAL PISTON ACTUATOR A pair of axially aligned and nested pistons (20,30) are mounted in a pressure sealed arrangement within the bore of a pressure housing (12). A primary piston (20) is moved in response to increasing pressure to provide an actuating output force while a secondary piston (30) simultaneously moves to overcome a reverse bias on it by a tension spring (40) and adds to the actuating force by engaging the primary piston (20) only when the pressure exceeds a specific higher threshold. The primary and secondary pistons thereafter operate in conjunction under the influence of high pressure to provide the output actuating force.