Heating and cooling curves for the double-memory-type shape memory a lloy (SMA) Cu-29 8 Zn-4Al have been measured. The microstructure of the allo y aged at various temperatures have been investigated using TEM. After analyzing properties of the alloy, the application parameters of a double-memory-type s pring formed from it were calculated. Based on the experimental data a themo-co ntrol valve for oil-field use was designed. The valve can switch on or off aut omatically. of simple construction, it functions reliably and is suitable for us e in critical situations .