Actuators often work under high temperature, high pressure, deep cold, strong corrosion, high viscosity, easy to crystallize, flash evaporation, cavitation, high pressure difference, etc., the use conditions are harsh, so it is the weak link of the entire control system. If the actuator is not selected or used properly, it will often make it difficult to automate the production process. In many cases, it will cause the control quality of the control system to decline, adjustment failure, and even cause serious accidents due to the flammable, explosive, and toxic media. For this reason, sufficient attention must be paid to the correct selection, installation and maintenance of the actuator.
The electric actuator receives the 0 ～ 10ma, dc or 4 ～ 20ma, dc signal output by the electric regulator, and converts it into the corresponding output shaft angular displacement or linear displacement, and operates the regulating valve to realize automatic adjustment.
Electric actuators are mainly divided into two categories: straight stroke and angular stroke. The former is used to operate a straight-stroke adjustment mechanism, and the latter is used to operate a corner-type adjustment mechanism. Both are position servos powered by two-phase asynchronous servo motors. The angular stroke actuator can be divided into single-turn and multi-turn. The angular displacement of a single-turn output is generally less than 3600, which is usually referred to as an angular-stroke actuator. The angular displacement of a multi-turn output exceeds 3600 and can reach several turns. Rotary control valve is used together.
Application of 24V explosion-proof electric actuators in industrial automation: used in a wide range of aviation, aerospace, military, machinery, metallurgy, mining, transportation, building materials, etc. Various forms of regulation and control.
Examples of main applications in process control and industrial automation are as follows:
① Application in sulfur ore production
Water injection flow control ball valve and disc valve control
② Application of potassium carbonate pipeline valve actuator
Sliding gate shunt gate ball valve and butterfly valve ball control valve
③ Application of water treatment valve actuator
Liquid flow control, pressure regulator, pressure control, acid solution flow control
④ Application of Valve Electric Actuator in Limestone / Cement Plant
Ball valve or butterfly valve control processing dry cement, gypsum, or liquid supply air and induced draft fan adjustment type damper damper bypass damper damper Environmental pollution control and dust removal device Sliding door Performs logistics control of raw materials in the hopper and storage warehouse The gas flow control valve at the inlet adjusts the amount of burner intake on the converter. The steam control valve controls the steam required during the production process.
⑤ Application of electric actuators in grain processing plants
Gate diverter valve distributor material unloader / heater dust removal isolation baffle air flow control (logistics drying) ball and butterfly valve control
⑥ Application of dampers and valve electric actuators in steel plants
Ball or butterfly valve control cooling water, waste water, or other cooling medium. Adjustable damper baffle air supply and induced draft fan bypass damper baffle gate environmental pollution control and dust removal device. Sliding door controls the flow of raw materials at the feed port to the hopper and The raw materials in the warehouse are controlled by logistics. The gas control valve and the steam control valve regulate the intake of the burner on the converter to control the steam required for the production process.
Application of electric shutters and valve actuators in Luan Aluminum Plant
Blower damper baffle primary inlet damper air preheating damper fume recirculation bypass damper secondary baffle damper main damper damper burner adjustment lever burner swing actuator hydraulic actuator actuator impeller Speed regulating valve, gas regulating valve, steam regulating valve, ball valve and butterfly valve control sliding gate
⑧Application of process control baffle
Air supplement exhaust fan bypass hot / cold air mixing and emergency shutdown
⑨ Application in the petroleum industry
Oil injection process flow control Gas lift pipeline main valve pressure control Water injection process flow control Oil well oil sampling test / production valve
⑩Application in the natural gas production and transmission industry
Gas lift air flow control gas pipeline main valve pressure control compressor surge control natural gas pressure control natural gas pipeline main valve pressure control emergency shutdown natural gas regulator control pressure control compressor surge control flow control.
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