| 摘要 |
A proportional valve for a fluid-treatment machine has a main body provided with a first connection element and with a second connection element to the hydraulic circuit of the machine. Inside of the main body there are at least one inlet duct and at least one outlet duct. Inside of the main body, in an inner chamber obtained between the inlet duct and the outlet duct, there is an actuation piston capable of selectively putting in communication the inlet duct with the outlet duct. The actuation piston is operatively connected to an actuation mechanism that comprises one elastic actuation member made of a shape-memory alloy and an electric current generating device, operatively connected to the elastic actuation member in order to modify the value of the elastic force applied on the actuation piston through a temperature variation caused by the passage of electric current inside the elastic actuation member. |
