Move the exhaust valve gently against the exhaust, then the steam will come out from the exhaust hole.

Note: When moving the exhaust valve to the exhaust position, be sure to pay attention not to use your hands, use a chopstick or something else to move, otherwise the steam will easily hurt your hands.

The United States of America electric pressure cooker is either no timer is not cooked rice, now according to the physical drawing of the circuit diagram and analyzed the principle. Plug in the electricity to turn the timer to their own needs, timer switch closure of the electric hot plate is powered to start heating, the temperature reaches 101 degrees after the insulation switch is disconnected into the timer pressure stage.

Expanded information:

Pressure-limiting valve (pressure-limiting device) role: in the cooking process, the pot pressure reaches the working pressure, the pressure-limiting valve through the vent exhaust work, so that the pot pressure to maintain within a certain range, to achieve the purpose of cooking. The role of the safety valve: in the cooking process, due to the restriction valve exhaust pipe blockage, resulting in pot pressure is too high, this time through the safety valve exhaust, in order to ensure the safety of the pressure cooker.

From a small hole in the pressure cooker, steam is constantly bubbling out. And it is accompanied by a whistling sound. This small hole is the vent. The vent hole is used in conjunction with a valve. This valve is designed to control the pressure and it is called a weighted safety valve. The safety valve has a weight on it, which is normally pressed on the vent hole of the pressure cooker, and when the pressure inside the pressure cooker reaches a certain pressure value, the weight is lifted due to the pressure.

Baidu Encyclopedia - Pressure Cooker Safety Valve