Description

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explosion proof type electric actuator

product-412-455

DKJ explosion-proof electric actuator can be matched with various quarter-turn valves, dampers, baffles and other regulating mechanisms, and is widely used in production process regulation and control systems such as electricity, metallurgy, petroleum, chemical industry, light industry, textile, food, and medicine.

Model compilations

The explosion-proof level of FRY explosion-proof series electric actuator is: ExdⅡBT4Gb

Ex - Explosion proof identification

D - Explosion Proof or Explosion Proof

- Equipment type represents electrical equipment designed for explosive gas atmospheres other than coal mines

B - the size of the explosion, which determines the dimensions (width and clearance) of each fire joint of the actuator;

T4 - Temperature class represents the maximum allowable surface temperature of the actuator of 135°C

Gb - Protection class standard

Why does the explosion happen?

An explosion is when a substance suddenly changes from one state to another through physical or chemical changes, releasing huge amounts of energy. The energy released at a rapid rate will cause violent impact and damage to surrounding objects. An explosion must have three conditions: explosive material, oxygen, and ignition source. Objectively, many industrial sites meet the conditions for explosions. When the concentration of the mixture of explosive material and oxygen is within the explosion limit, if there is an explosion source, an explosion will occur.

product-516-238

To prevent explosions, we must consider the above three necessary conditions. If we limit one of the necessary conditions, we can limit the explosions. Electrical equipment is also a potential ignition source, which can cause surface temperature rise, static discharge or sparks caused by instantaneous current when the machine is running. From the design point of view, flameproof electrical equipment can enclose the ignited explosive mixture in a shell, which is particularly strong and can withstand the explosion pressure of the internal explosive mixture and prevent the explosive mixture from spreading to the outside of the shell. Therefore, flameproof electrical equipment can prevent it from becoming a potential ignition source.

product-478-329

This type of explosion-proof electric actuator can withstand the internal explosion of the flammable mixture that has entered the casing without being damaged, and any joint surface or hole on the casing through which it passes will not ignite the casing of electrical equipment in an external explosive environment formed by one or more gases or vapors.

product-327-389

Technical data

① Input signal

A. Analog signal 4~20mADC (input resistance 250Ω);

B. Passive switch signal.

② Position feedback signal 4~20mA DC (load resistance 500Ω)

③ Output contact capacity 24V, DC, 1A;

④ Basic error limit ±2.5%±1.5%;

⑤ Dead zone setting 1%~2.0%;

⑥ Return diffference not more than 1.5%;

⑦ Rated travel 90° (angle);

⑧ Rated travel time 25S±20%;

⑨ Working power supply

a. Rated voltage 220V;

b. Rated frequency 50Hz;

⑩ Operating environment

a. Temperature -25C~+70C;

b. Relative humidity not more than 95%

C. The surrounding air does not contain corrosive gases.

Working principle

DKJ explosion-proof electric actuator is a position servo mechanism with AC servo motor as the power device. The whole machine consists of three parts: gearbox, AC servo motor and controller which are relatively independent in structure.

product-388-266