Industrial boiler security selection and structure principle and application of pneumatic valve

at present, China's industrial boiler safety commonly used pneumatic valve: pull rod, spring loaded, dead weight, pulse, and composite varieties. First of all, the safety lever pneumatic valve pneumatic valve is divided into single lever security lever type and leverage the parallel bars. Because they have a lot of the lever and weight torque of pneumatic valve core, in order to balance the steam ( Water) The safety of the pressure, also known as hammer pneumatic valve. Leverage ( Hammer type) Mainly by the pneumatic valve core, pneumatic valve seat, lever, hammer, limit device, etc. This is the weight of a heavy hammer, in his seat through the pressure lever pneumatic valve core, move, change the size of the hammer, adjust the security pneumatic valve opening pressure. Hammer effect when the boiler pressure more than the upper pressure pneumatic valve core, left before the start of the pneumatic valve core seat, discharge of steam. Heavy hammer boiler pressure than in the above pressure pneumatic valve core, pneumatic valve core land, low boiler stop exhaust. The pneumatic valve has simple structure, convenient adjustment, reliable performance, it is very common boiler applications. General single rod used for low pressure boiler safety pneumatic valve, double lever, the safety of the high pressure boiler pneumatic valves. Secondly, spring loaded safety pneumatic valve is mainly composed of pneumatic valve spring, pneumatic valve seat, pneumatic valve rod, spring, adjusting screws, etc. The security of the pneumatic valve spring tension, in the pneumatic pressure is the main advantage of pneumatic valve core seat. When the boiler pressure more than spring pressure effect on the pneumatic valve core, pneumatic valve core and valve stem top, steam discharge, when the boiler pressure is greater than the spring action of pneumatic valve core, the land under the pressure of the pneumatic valve core upside in pressure, exhaust boiler stop. Pneumatic valve seat is conical surface and pneumatic pneumatic valve core out around seemed nervous. When steam open pneumatic valve, pneumatic valve core and the edge effect of steam pressure, so, in the sudden increase in activity area, suddenly opened the safe pneumatic valve, when falling to reduce, because all of a sudden the steam power is reduced, so that the pneumatic valve is closed, in order to prevent the pneumatic valve core is repeated. Spring loaded safety opening pressure of the main parameters of pneumatic valve and exhaust capacity, as well as the ability to vent pneumatic seat at depends on the diameter and height. Lifting height difference, can be divided into tiny qi, qi and AnQuanSan pneumatic valve group. Spring loaded safety pneumatic valve, compact structure, small volume, light weight, compact, and easy to adjust, and can withstand the vibrations, there are few leakage phenomenon. Therefore, sensitive, and reliable. It is suitable for the most widely, it is one of the most common. Third, the static weight safety pneumatic valve it is by the pneumatic valve, pneumatic valve seat, a hoop, pneumatic valve cover, screws and other components. The pneumatic valve is mainly used for the weight of the hoop, so that the pneumatic valve seat, when the boiler pressure exceeds the iron in the upper part of the pneumatic valve core pressure, pressure pneumatic valve core to become the world first-class, steam flow: boiler pressure on China railway pneumatic valve core, the role of pneumatic valve core part of the land fall to low, stop the exhaust. Self-respect safe pneumatic valve structure is simple, easy, but the volume is big. To adapt to difficult, sensitivity is also low, only a small low pressure boiler. At present, China is rarely used industrial boiler. Fourth, the pulse pneumatic valve, pneumatic valve which is mainly composed of pulse safety such as the main driver of pneumatic valve and tubes of spring. Pulse pneumatic valve working principle is: when the drum or overheat pressure exceeds the set value, through the pulse steam pipe, pneumatic valve, pneumatic valve into the pulse springs, top drive, pneumatic valve core pulse pneumatic valve spring type safety, steam, into the upper main pneumatic valve piston, the piston moves down, open the main pneumatic valve, the exhaust steam pressure. When pressure is back to normal blood pressure and pulse pneumatic valve spring type safety shut down, to disrupt pneumatic main steam safety valve piston, main pneumatic valve pneumatic valve core role in spring closed the upper part of the steam. Pneumatic valve equipment of electrical safety protection electric control system. When the overpressure of the boiler, and then, the air pressure gauge contact closure, electromagnetic pulse pneumatic valve is connected to the spring, make work, pneumatic valve open; Back when pressure is too low or pneumatic valve failure, and electric control switch operation, connected to the solenoid coil, closing coil, pneumatic valve shut off. On access catheter pulse pneumatic valve operation safety of pneumatic valves, intact state, thus increasing seal. This kind of high pressure boiler safety pneumatic valve. Five, composite safety pneumatic valve composite pneumatic valve by two of the same or different a pneumatic valve, in connecting to a seat, in order to reduce the student enrollment. This site keywords: pneumatic ball valve pneumatic ball valve pneumatic pneumatic valve pneumatic pneumatic valve pneumatic butterfly valve pneumatic butterfly valve pneumatic actuator pneumatic execution