Shutoff valves are intended for rapid shutting of input hole when the fluid temperature reaches a definite value. Thermosensitive element in this valve design is a TiNi shape memory spherical segment which used at the same time as an actuator. Mirror-like bended spherical segment loses stability and turns into the initial form with a snap at the temperature near A_f. The active element is as a trigger in this valve design and the hermeticity of closed input hole of valve is provided with a hardness of the force spring. Increasing a hardness of the force spring we can apply the valve under sufficiently high pressure of the operating fluid (water, gas and petroleum products).

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1. Generation and relaxation of reactive stress in active elements from shape memory alloys