With the development of the global economy and the improvement of industrial level, and the strict control requirement of industrial parameters, more and more industries begin to pursue automatic control. They will use electric actuator butterfly valve, electric actuator ball valve, electric control valve, electric diaphragm valve, pneumatic control valve and so on. However, the implementation of automatic control of the main impact of the parameters is the actuator.
There are two basic types of valve operation to consider when considering the requirements of automation, that is, the choice of the actuator.
One is angular-stroke actuators, such as quarter-turn electric actuators, single-acting pneumatic actuators, and double-acting pneumatic actuators. These actuators rotate at 90 degrees according to the required torque. Available with ball valve, butterfly valve, gate valve, globe valve combination.
Quarter-turn electric actuator torque up to 4000Nm, and can be manually controlled. There are 4 models for you to choose, namely switch type, adjustment type, intelligent type, explosion-proof type and intelligent reset type, can be widely used in different fields. Affordable price, high cost-effective, more favored in the market.
Pneumatic and hydraulic actuators are very common because they do not need power and simple structure, reliable performance, switching speed is extremely fast, the same can also be used with ball valve and butterfly valve, so the field is very wide.
The other is a multi-turn valve, also known as the straight stroke. These valves can be non-rotating lifting stem or rotating non-lifting stem, requiring additional rotation to drive the valve to the open or closed position. Multi-turn valves include through Valve (globe valve) , gate valve, knife gate valve and so on.
Among them, fluid-driven multi-rotary or linear output actuator is often used to operate through valve (globe valve) and gate valve, because of its simple structure, reliable performance, it is easy to achieve the fail-safe operation mode. In general, electric multi-turn actuators are used to drive gate and globe valves, and hydraulic or pneumatic actuators are only considered when no power is available.
Alternatively, pneumatic or hydraulic cylinders or film actuators with linear output can also drive the valve.
Post time: Jul-28-2021