Pneumatic apparatus comprising: - a linear pneumatic actuator comprising a casing and a piston that is slidable inside said casing and defining in the latter a first chamber and a second chamber, - fluid distributing means arranged for distributing pressurized fluid alternatively to said first chamber and to said second chamber, - an economizer device (100; 100'; 200; 200'; 300) comprising: a body provided with a first opening connected to said fluid distributing means, with a second opening connected to one of said chambers, and with a third opening, said first, second and third opening (103, 104, 105) being connected together by a main conduit made in said body; flow controlling means that is movable between a first operating configuration, wherein the flow controlling means permits the connection between said second opening and said third opening and prevents the connection between said second opening and said first opening, and a second operating configuration, wherein the flow controlling means closes the connection between said second opening and said third opening and permits the passage of fluid between said second opening and said first opening; characterized by comprising vacuum generating means connected to said third opening so as the flow controlling means in said first operating configuration places said vacuum generating means in communication with said chamber. - a linear pneumatic actuator comprising a casing and a piston that is slidable inside said casing and defining in the latter a first chamber and a second chamber, - fluid distributing means arranged for distributing pressurized fluid alternatively to said first chamber and to said second chamber, - an economizer device (100; 100'; 200; 200'; 300) comprising: a body provided with a first opening connected to said fluid distributing means, with a second opening connected to one of said chambers, and with a third opening, said first, second and third opening (103, 104, 105) being connected together by a main conduit made in said body; flow controlling means that is movable between a first operating configuration, wherein the flow controlling means permits the connection between said second opening and said third opening and prevents the connection between said second opening and said first opening, and a second operating configuration, wherein the flow controlling means closes the connection between said second opening and said third opening and permits the passage of fluid between said second opening and said first opening; a body provided with a first opening connected to said fluid distributing means, with a second opening connected to one of said chambers, and with a third opening, said first, second and third opening (103, 104, 105) being connected together by a main conduit made in said body; flow controlling means that is movable between a first operating configuration, wherein the flow controlling means permits the connection between said second opening and said third opening and prevents the connection between said second opening and said first opening, and a second operating configuration, wherein the flow controlling means closes the connection between said second opening and said third opening and permits the passage of fluid between said second opening and said first opening;