Operation of electric Pressure Cooker
5. Connect the power supply of the electric pressure cooker, the indicator light of the electric pressure cooker is on, and set the pressure holding time according to the food.
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1. When using the electric pressure cooker, take out the inner tank of the pressure cooker, and then put the ingredients into the inner pot. At the same time, the food and water shall not exceed 4 / 5 of the height of the inner pot, and the food that is easy to expand shall not exceed 3 / 5 of the height of the inner pot. After adding the ingredients, users can add an appropriate amount of water according to their own needs;
2. After the ingredients are put into the inner pot, put the inner pot in the outer pot. When putting into the inner pot, wipe the heating plate of the inner pot. At the same time, when putting into the inner pot, ensure that the inner pot and the heating plate are in good contact.
3. After preparation, check whether the sealing ring has been placed when the pressure cooker lid is closed. At this time, rotate the sealing ring left and right by hand to place it on the steel ring, and rotate it counterclockwise to the buckle position when the lid is put down. 4. After placing the pot cover, turn the pressure limiting vent valve of the electric pressure cooker to the sealing position, and check whether the float valve is placed properly.
Eight kinds of control valve vibration solution
1, increase the stiffness method of oscillation and slight vibration, can increase the stiffness to eliminate or reduce, such as the use of large stiffness of the spring, the use of piston actuators and other means are feasible. 2, increase the damping method to increase the damping that is increased friction on the friction, such as the sleeve valve spool can be used "O" ring seal, with a larger friction graphite filler, which to eliminate or reduce the slight vibration or Have a role 3, to increase the size of the guide, reduce the gap with the shaft-type valve generally oriented guide size is small, all valves are generally larger with the gap, 0.4 ~ lmm, which is to produce mechanical vibration is helpful. Therefore, when a slight mechanical vibration occurs, the vibration can be weakened by increasing the guide size and reducing the mating clearance. 4, to change the shape of the throttle device to eliminate the resonance method due to the so-called vibration source valve occurs in the high-speed flow, the rapid changes in pressure orifice, changing the shape of the throttle can change the vibration source frequency, resonance is not strong when compared Easy to solve. The specific method is to be within the scope of the opening of the valve core turning 0.5 ~ 1.0mm. For example, a self-operated pressure regulating valve is installed near the factory area of ​​a factory. The whistle of the resonance causes the worker to rest. After the 0.5mm spool surface is dropped, the resonance whistle disappears. 5, replacement of throttling pieces Elimination of resonance method with 4.5 in 4), but is to replace the throttling pieces. The methods are: ①replacement of flow characteristics, log linear, linear change logarithm; ② replace the spool form. Such as the shaft plug into a "V" shaped spool, the two-seat valve shaft type into a sleeve-type; will open the window sleeve to play a small hole sleeve. If a nitrogen fertilizer plant a DN25 two-seater valve, the valve stem and spool connections often broken, we confirmed that the resonance, the linear characteristics of the spool to the logarithmic spool, the problem is solved. Another example is an aeronautical institute laboratory with a DN200 sleeve valve, the valve plug can not be cast with a strong rotation, the opening of the sleeve to a small hole to the sleeve, the rotation disappeared immediately. 6, the replacement of the type of control valve to eliminate resonance Different structure of the control valve, the natural frequency of natural, replacement valve is the fundamental way to eliminate resonance the most effective way. A valve resonates very strongly during use - strongly vibrates (can damage the valve in severe cases), rotates strongly (even the valve stem is shaken and broken) and produces strong noise (up to over 100 dB) Valve, as long as it replaced a valve with a large difference in structure, immediate effect, strong resonance miraculously disappear. Such as a vinylon plant expansion project selected a DN200 sleeve valve, the above three phenomena exist, DN300 pipe followed by the valve plug rotation, the noise 100 dB, the resonance opening 20 ~ 70%, consider the resonance open Degree, use a double seat valve, the resonance disappears, put into operation normally. 7, to reduce the cavitation vibration method due to cavitation bubble rupture and cavitation vibration, naturally should reduce the cavitation on the way. ①Let the bubble burst impact energy does not act on the solid surface, especially the spool, but to liquid absorption. Sleeve valve has this feature, so you can change the spool plug sleeve type. ② to reduce cavitation all the ways, such as increasing the throttling resistance, increasing the pressure of systolic orifice, grading or series decompression. 8, to avoid the wave wave hit the wave method of external shock wave vibration caused by the valve, which is obviously the normal operation of the control valve should be avoided, if such a vibration, it should take appropriate measures.