Abstract: The invention concerns pneumatic actuators for valves comprising a body closed by head flanges, two pistons moving in said body in opposite directions, an output shaft that turns actuated by the pistons, and a stop device on each head flange to limit the stroke of the pistons when they move away from each other towards the head flanges. On at least one side of the actuator body an adjusting device (22) is provided which includes stop means (26, 27) at varying distances from each other in a direction parallel to the movement of the pistons and arranged in a position to intercept and limit the stroke of the pistons when the latter move towards each other.

Abstract: The invention concerns pneumatic actuators for valves comprising a body closed by head flanges, two pistons moving in said body in opposite directions, an output shaft that turns actuated by the pistons, and a stop device on each head flange to limit the stroke of the pistons when they move away from each other towards the head flanges. On at least one side of the actuator body an adjusting device (22) is provided which includes stop means (26, 27) at varying distances from each other in a direction parallel to the movement of the pistons and arranged in a position to intercept and limit the stroke of the pistons when the latter move towards each other.

Abstract: The invention concerns a coaxial valve, particularly for the delivery of chemically aggressive fluids in the pharmaceutical and medical sectors and also for use in the food industry. The opening and closing of the valve is achieved in a combined pneumatic and magnetic actuating system, realised with the help of a pneumatic piston-actuator and an obturator positioned in parallel chambers, separated and constrained one to the other by means of permanent magnets for the movements of the obturator in opposite opening and closing directions in response to the movements of the piston-actuator caused by a fluid under pressure.

Abstract: The invention concerns a block coaxial valve, especially for compressed air systems. The valve includes a valve body having an aligned fluid input and output ports and, between the ports, a central chamber in which an block piston is housed, functioning as a shutter, formed with an axial hole and movable from a closed position to an opening position of a valve seat provided in the valve body on the side of the fluid input port. The valve body is made up of an intermediate tubular element (13) and two couplings sleeves (14, 15) fixed at its opposite far ends. Within the valve body, the intermediate tubular element forms the chamber (18, 18?) housing the piston/shutter (12) whereas the couplings sleeves respectively form the fluid input (16) and output (17) ports.