Electronic torque wrench, has central processor for controlling control element for pressure discharge of hydraulic fluid when applied torque measured by strain sensor is larger than preset reference torque value

摘要

The wrench has a releasing unit (40) arranged in a retaining area (12) of a tubular housing (10). The releasing unit has a releasing element (42) that is movably arranged between an attachment part (22) and a cylinder (41). A central processor is electrically connected with a strain sensor (30) and a control element (43) i.e. magnetic valve, where the central processor controls the control element for pressure discharge of a hydraulic fluid (415) when applied torque measured by the strain sensor is larger than a preset reference torque value.