What are the classifications of electric butterfly valves?
1. Hydraulic electric butterfly valve:
Hydraulic electric butterfly valves are widely used in automobile suspension systems. The principle is that when the frame and axle move reciprocally and the piston moves reciprocally in the cylinder barrel of the electric butterfly valve, the oil in the electric butterfly valve housing will flow from the inner cavity to another through some narrow pores repeatedly. At this time, the friction between the liquid and the inner wall and the internal friction of the liquid molecules will form the damping force for the vibration.
2. Inflatable electric butterfly valve:
The pneumatic electric butterfly valve is a new type of electric butterfly valve developed since the 1960s. Its structure and point are that a floating piston is installed at the lower part of the cylinder barrel, and a sealed gas chamber formed by the floating piston and one end of the cylinder barrel is filled with high-pressure nitrogen. The floating piston is equipped with a large section O-ring, which completely separates oil and gas. The working piston is equipped with a compression valve and an extension valve that can change the cross-sectional area of the channel according to its movement speed. When the wheels are bouncing up and down, the working piston of the electric butterfly valve reciprocates in the oil, causing the oil pressure difference between the upper chamber and the lower chamber of the working piston, and the pressure oil pushes open the compression valve and the extension valve to move back and forth. Because the valve has a greater damping force on the pressure oil, the automobile air valve attenuates the shock.
3. Membrane electric butterfly valve
With the development of the automobile industry and industrial technology, the use of high-strength nylon, Kaplon and other cord fabrics, the membrane electric butterfly valve has been widely used on the suspension of domestic and overseas buses in recent years. For example, this type of butterfly valve is used on Leland, Wuhan WH644 and WH643 buses. Its characteristics are:
a. It can be regarded as the formation of the lower cover plate of the bladder electric butterfly valve into a piston. Because this change has greatly improved the elasticity and performance of the electric butterfly valve, and obtained a more ideal inverted "S" shaped butterfly valve and performance curve than the bladder electric butterfly valve. It can be seen that the rigidity change of the membrane electric butterfly valve is smaller than that of the bladder electric butterfly valve within its normal operating range, so in terms of the vibrating head energy, the membrane electric butterfly valve is much better than the bladder electric butterfly valve It is worth mentioning that the membrane electric butterfly valve can control the change rate of its effective area by changing the shape and size of the piston to obtain ideal elasticity and performance. This is not easy to do for the bag type electric butterfly valve.
b. The change rate of the effective area of the membrane electric butterfly valve is smaller than that of the capsule electric butterfly valve. Therefore, the membrane electric butterfly valve can obtain a lower natural vibration frequency when the auxiliary air chamber is small. However, it is not easy for the bladder type electric butterfly valve to be designed with very low frequency.
c. At present, the sealing form of the membrane electric butterfly valve is generally pressure self sealing, while the sealing of the capsule electric butterfly valve is generally clamped with screws, so the sealing of the membrane electric butterfly valve is simple and easy to assemble and disassemble.
d. The membrane electric butterfly valve is simple in manufacture and convenient for mass production.
Mainly used for vibrating machinery, double deck passenger cars, trucks and other industrial machinery. Butterfly valves are commonly used in mechanical equipment, vehicle running mechanism and suspension system, playing a role of shock absorption and buffering.