PURPOSE:To contrive decrease of a necessary space and the number of parts, by a method wherein an element increasing a resistance value through self-heating based on an electric current electrifying the element itself and a control component consisting of a shape memory alloy material are brought close to each other and a control valve is opened or closed by a control component. CONSTITUTION:When a switch 9 is turned ON, a positive property thermistor 20 and a control component 21 are electrified, the control component 21 is extend by recollecting memory through self-heating of the control component 21 and a control valve 12 of a water cock 3 is opened through a lever 13. In this instance, although an electric current is applied to the positive properties' thermistor 20 also, as the positive property thermistor 20 is in a state to be heated through the self-heating of the control component 21, the temperature of the positive property thermistor 20 is ascended, resistance is increased suddently at a certain fixed temperature, an electric current value to be applied to the control component 21 is decreased, the control component 21 is contracted through decrease of a self-heating value of the control component 21 and the control valve 12 of the water cock 3 is closed through the lever 13. It becomes that the titled air conditioner is controlled by repeating opening and closing of the control valve 12 within a certain temperature range by repeating the above matter.