HYDRAULIC ACTUATING ASSEMBLY

摘要

The invention relates to a hydraulic actuating assembly for valves for controlling process fluid flows, comprising a valve that is operated by an actuator and that is pre-tensioned in the direction of a closing position. The actuator has a pressure chamber that is active in the opening direction and that can be connected to a low pressure by means of three parallel relief paths. According to the invention, a secondary relief path, which can be activated in a test mode, is provided.