| 主权项 |
1. An economizer device associable with a linear pneumatic actuator having a casing and a piston slidable inside the casing and defining two chambers in the latter, said device comprising a body provided with a first opening selectively connectable to a source of pressurized air or to an environment at atmospheric pressure, a second opening connectable to a chamber of the linear pneumatic actuator and a third opening selectively connectable to a source of pressurized air, said openings being connected together by a first conduit, the device comprising a Venturi vacuum generator slidably housed and movable in said first conduit, said device being arranged for operating between a first operating configuration, in which said first opening is supplied with air at an operating pressure and said Venturi vacuum generator is movable in said first conduit to permit a primary flow of air and to reduce an outlet pressure thereof from the second opening so as to supply the chamber with air at a reduced pressure lower than said operating pressure, and a second operating configuration, in which said first opening is connected to the environment at atmospheric pressure, said third opening is supplied with pressurized air with which it supplies said Venturi vacuum generator that creates a vacuum in said opening in such a manner as to suck air from and create a vacuum in the chamber of the linear pneumatic actuator. |
