Selection of pneumatic actuators

in the selection of pneumatic actuator pneumatic actuators, pneumatic head, also known as a guarantee for normal work of ensure the start valve of a product, there are strict requirements for its choice, if choose may when will affect the use, but also can bring serious consequences and the economy at any time, so how to choose?
if the work environment is poor choice of the DCL series, the series of products can apply to the following work environment.
1。 Outdoor installation of the device, and the wind, sand, snow, and the environment with big temperature difference between day and night
2. Humid and dry tropical, temperature in - 30 - 60℃
3。 Salt spray, mold working environment, such as dock ship
4. Containing corrosive gas environment, such as chemical plant
to choose according to the type of valve, there are different kinds of valve working principle is different also, so pneumatic actuators to choose matching Angle trip started actuators ( Angle & lt; 360 degrees)
the electric actuator output shaft rotation is less than a week, that is less than 360 degrees, 90 degrees is usually so as to realize the control valve opening and closing process. This kind of electric actuator according to the different methods of installation interface is divided into direct type, base crank type two kinds.
direct type: refers to the electric actuator output shaft and the valve stem in the form of direct installation.
the base crank type: refers to the output shaft in the form of a crank connected with the valve stem.
this kind of electric actuator for butterfly valves, ball valves, plug valves, etc.
multi-turn electric actuator ( Angle & gt; 360 degrees)
the electric actuator output shaft rotation is more than a week, that is greater than 360 degrees, usually need more than one ring valve opening and closing process control can be achieved.
this kind of electric actuator is suitable for the gate valves, globe valves, etc.
according to the requirement of production process control of electric actuator control mode
general component is the control mode of electric actuator type switch ( Open loop control) And external regulation ( Closed-loop control) Two kinds big. Switch type ( Open loop control) Switch type electric actuators generally realize to control the valve opening or closing, the valve or in full open position, either in a seated position, the valve does not need to precisely control medium flow.
in particular switch type electric actuator due to the difference of structure can be divided into fission structure and integrated structure. Specify required to items, otherwise often occur in the site installation with active control system conflict does not match. External regulation ( Closed-loop control) External regulation of electric actuator is not only have the function of the switch integrated structure, it also can accurately control the valve and to accurately adjust medium flow. Due to space limited its working principle in this not elaborate. Here are external regulation need to indicate that the parameters of the model selection of the electric actuator do brief explanation.