Electric actuators are mainly used in power plants or nuclear power plants because of the need for a smooth, stable, and slow process in high pressure water systems. The main advantages of electric actuators are their high stability and user-applied constant thrust. The maximum thrust generated by the actuator can be as high as 225,000 kgf. Only hydraulic actuators can achieve such high thrust, but hydraulic actuators cost more than electric actuators. Much higher. The anti-deviation ability of the electric actuator is very good, the output thrust or torque is basically constant, it can overcome the imbalance force of the medium well, and achieve accurate control of the process parameters, so the control accuracy is better than the pneumatic actuator. high. If equipped with a servo amplifier, it is easy to realize the exchange of positive and negative effects, and it is also easy to set the status of the valve position of the off signal (maintain/full open/full close), and when it fails, it must stay in position. This is Pneumatic actuators cannot do this and pneumatic actuators must be secured by means of a combined protection system.
The disadvantages of electric actuators are:
The structure of the electric actuator is more complex and more prone to failure, and due to its complexity, the technical requirements for on-site maintenance personnel are relatively higher; the motor operation generates heat, and if the adjustment is too frequent, the motor may overheat and generate heat. Protection, but also increase the wear and tear on the reduction gear; the other is the slower running, output a signal from the regulator to the valve to respond to move to that corresponding position, it takes a long time, which is not as good as pneumatic, Hydraulic actuator place.
The actuator and adjustment mechanism of the pneumatic actuator is a unified whole, and the actuator is a film type and a piston type. The piston stroke is long and is suitable for applications where there is a need for high thrust; while the film-type stroke is small and can only directly actuate the valve stem. Because the pneumatic actuator has the advantages of simple structure, large output thrust, stable and reliable operation, safety and explosion proof, etc., it is widely used in power plants, chemical industry, oil refining and other production processes with high safety requirements.
The main advantages of pneumatic actuators :
Receiving continuous air signal, output linear displacement (can also receive continuous electric signal after power-on/gas conversion device), and some can output angular displacement when matched with rocker arm.
There are positive and negative effects.
The speed of movement is large, but the speed becomes slower as the load increases.
The output force is related to the operating pressure.
High reliability, but the valve cannot be maintained after the air supply is interrupted (can be maintained after the valve is installed).
Inconvenient to achieve segmented control and program control.
Maintenance is simple and the adaptability to the environment is good.
Larger output power.
With explosion-proof function.
Initiator TBPB
Tert-Butyl peroxybenzoate (TBPB) a chemical compound from the group of peresters. It is often used as a radical initiator in polymerization reactions, such as the production of LDPE from ethylene, and for crosslinking, such as for unsaturated polyester resins.
TBPB is a low volatility ,high purity,liquid, aromatic peroxuester.it is effective as medium of a broad spectrum of monomers e.g .styrene.ethylenn,acrylics.it is also used to cure (copolymerzation) unsaturated resins .
TBPB is a clear light yellow liquid, which is little soluble in water but well in many organic solvents such as ethanol or phthalate.
As peroxo compound, TBPB contains about 8.16 wt% of active oxygen and has a self accelerating decomposition temperature (SADT) of about 60 °C. The SADT is the lowest temperature at which self-accelerating decomposition in the transport packaging can occur within a week, and which should not be exceeded while storage or transportation.[2] TBPB should therefore be stored between minimum 10 °C (below solidification) and maximum 50 °C. Dilution with a high-boiling solvent increases the SADT. The half-life of TBPB, in which 50% of the peroxy ester is decomposed, is 10 hours at 104 °C, one hour at 124 °C and one minute at 165 °C. Amines, metal ions, strong acids and bases, as well as strong reducing and oxidizing agents accelerate the decomposition of TBPB even in low concentrations.[ However, TBPB is one of the safest peresters or organic peroxides in handling. The main decomposition products of tert-butyl peroxybenzoate are carbon dioxide, acetone, methane, tert-butanol, benzoic acid and benzene.
Initiator Tbpb,Tert-Butyl Peroxybenzoate Formula,Tert-Butyl Peroxybenzoate Activation,Tert Butyl Peroxybenzoate Formula
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