The function of explosion-proof electric actuators
Electric actuators are essential equipment for achieving valve program control, automatic control, and remote control. Its movement process can be controlled by stroke, torque, or axial thrust size. Because the performance and utilization of electric devices depend on the type of valve,Operating procedures for equipment and location of valves, pipelines or equipment,Choosing the right electric actuator is crucial,To prevent overload(The working torque is higher than the control torque)Electric actuators include two types, generally divided into partial rotation electric actuators and multi rotation electric actuators,The former mainly controls valves that require partial rotation, such as ball valves and butterfly valves, while the latter requires valves that rotate multiple times, such as gate valves.
Explosion proof grade of explosion-proof electric actuator
The explosion-proof electric actuator adopts an upper mounted structure, which reduces the connection bolts of the valve body under high pressure and large diameter conditions, enhances the reliability of the valve, and can overcome the influence of system weight on the normal operation of the valve. The shell is made of hard aluminum alloy, which has undergone hard anodizing treatment and polyester powder coating treatment. Light weight, strong corrosion resistance, and protection level up toIP67EvenIP68Can be applied to various harsh working environments.Common explosion-proof types includeExplosion proof typeIncreased safety type, intrinsic safety type, positive pressure type, and spark free type.
1. Explosion proof electric actuators have explosion-proof shells that can withstand internal explosions of flammable mixtures that have entered the shell without damage; And through any joint surface or structural hole on the shell, it will not ignite the surrounding gas or vapor, forming a type of electric actuator with an external explosive environment.
2Increased safety typeThe principle of electric actuators is to take additional measures to improve the safety of electric actuators that do not generate arcs or sparks under normal operating conditions,Prevent potential dangerous temperatures, arcs, or sparks from occurring in the internal box and external components.
3. All internal circuits of intrinsically safe electric actuators adopt intrinsic safety circuits. The essential circuit refers to a circuit that operates under specified conditions(Including normal work and specified conditions)Any sparks or thermal effects generated are insufficient to ignite the explosive gas environment surrounding the circuit.
4. Positive pressure electric actuator is a measure to achieve safety by maintaining the pressure of the internal protective gas higher than the pressure of the surrounding explosive environment.
5. The structure of non sparking explosion-proof electric actuators is roughly the same as that of ordinary actuators, except that higher requirements are placed on the protection level of the casing and the structure of the junction box;In addition, some reliability measures have been added to the manufacturing process conditions, so its reliability is relatively high, and its price is the lowest among various explosion-proof electric actuators; And the maintenance is simple, and it can be widely applied to2Dangerous environment in the area.
As a third-party testing organization specializing in explosion-proof testing and certification, Shenzhen Zhongnuo Testing Technology Co., Ltd. can provide design, testing, and certification services for various explosion-proof electric actuators, pneumatic actuators, and actuators.
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