Alloys of certain metals such as Ni-Ti and Ni-Ti-Cu, can memorize shape,so that even if it is deformed ,it exhibits the property of returning to its original shape as a result of temperature changes.  shape memory alloy springs can be used in water mixing valves,fire damper etc.

The steel wire used in the multi-strand springs is thinner than the single-strand springs,so the material strength is higher. At the same time, when the multi-strand springs is deformed, the mutual friction caused by the contact pressure between the steel wires of each strand can absorb the energy ，and has a buffering effect on it . What’s more The rigidity of each steel wire of the muti-strand springs is smaller than single strand wire springs,so the service life is much improved under the action of dynamic load.

High temperature spring is widely used in high temperature environment, such as nuclear power plant, pressure vessel, petrochemical and smelting industry, exhausting system and brake system. Baijia high temperature springs can be divided into four levels: 343℃/500-550℃/600-650℃/780-815℃