FLUID-OPERATED ACTUATOR WITH IMPROVED STROKE LIMIT ADJUSTMENT MEANS

摘要

A fluid-operated actuator (1) with improved stroke limit adjustment means comprising a containment body (2) that forms a sliding chamber (3) of at least one piston (4) for the actuation of a control shaft (10) which can be associated with a valve to be driven. Stroke limit means are associated with the control shaft (10), inside the containment body (2), consisting of an elongated plate (20) that forms, on a first side, a cam-like profile provided with end portions (22) for providing stroke limits that are offset by -5° and +5° with respect to the theoretical open and closed positions of the valve. A central portion (23) is further provided for locking the valve open and closed. The plate (20) has, on a second side which is opposite to the first side, a second cam-like profile with end portions (24) that provide stroke limits which are offset by angles larger than the offset provided by the end portions of the cam-like profile.