VALVE ACTUATOR DEVICE WITH DRIVING ARM HAVING A MODULAR STRUCTURE

摘要

A valve actuator device comprises a supporting body (2), a valve- driving shaft (5), rotatably mounted in the supporting body (2) around a main axis (4), and a fluid cylinder (6) having a body connected to one side of said supporting body (2). The cylinder (6) has a rod (8) that controls rotation of a driving arm (10) rigidly connected to said driving shaft (5). The linear movement of the rod (8) is converted into a rotation of the driving arm (10) by engagement of a cam-follower pin (12) carried by said rod (8) within a slot (11) formed in the driving arm (10). The slot (11) is formed in an insert (20) that constitutes an element separate from the body of said driving arm (10) and that is received and held within a seat (19) of the body of the driving arm (10). Thus a single main body (10) for the driving arm can be provided, having a plurality of inserts (10) that can be mounted selectively within the seat (19) of the main body (10) of the driving arm and are differentiated from one another in the dimensions and shape of the slot (11) and/or in the material of the insert. It is thus possible to arrange an actuator device best suited to the specific requirements of an application within an extremely short time and at a low cost of production.