Functions of pneumatic actuator accessories, thank you
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Two red air pores, with two air holes on each side – what is their function? Also, there are screw holes on the top – what is their purpose? Thank you. One last question: can it be determined from the appearance whether it is air-on or air-off?
Red indicates the air intake and exhaust ports, while the four small holes at the top and bottom are the screw holes for fixing the solenoid valves. It is not required when the solenoid valve is installed separately. The top 2 screws serve a positioning function, used to adjust the position of the valve switch. Judging from the picture, it should be a gas on-valve (the actual type depends on the manufacturer’s selection)
How did you determine that it operates pneumatically? So, for those two red ones, does connecting them to the left side enable the gas to flow, while connecting them to the right side stops the gas flow?
The two red ones are the inlet and exhaust ports, while the two hexagonal bolts serve to adjust the limits; they are likely air-operated valves.
What type of actuator is this, and can I find an explanation of its working principle there?
This is a double-acting valve; take a look at what position it is when both solenoids lose power and air pressure at the same time
The yellow area at the top of the image generally indicates the actual position of the valve. For air-operated valves, it is necessary to consider the air circuit, as well as whether it is a single-acting or double-acting cylinder
Two-way valves don’t have a concept of opening via air pressure or closing via air pressure; from the display, it can be seen that there is no air supply at the moment, and the valve’s position is indicated as closed. This is just a coincidence – it’s possible that the valve was already closed due to air pressure present at the time of manufacturing. During periods of no flow while in use, if the flow rate and pressure of the fluid in the pipeline are too high, it is possible for the valve disc to shift in one direction over an extended period as the fluid flows in that direction; this has nothing to do with whether the valve operates on air opening or air closing principle.
This is a double-acting cylinder; FL – air supply lost, the valve remains in its final position and stays there
Who can provide a detailed schematic diagram explaining the working principle? Thank you
This post was last edited by feng*aosa on 2019-2-23 at 15:16. Whether such actuators are single-acting or double-acting, and whether they operate on air pressure or not, must be determined based on the model. Its output shaft rotates 90°. By separating the valve body from the actuator, rotating the valve stem 90° and then reinstalling it, the air-open and air-close characteristics can be changed. The single and double-acting principle is shown in the figure below. The valve position indicator at the top is an accessory. It can be removed or adjusted (similar to changing the open/closed state). If a rotary stroke valve positioner is used, continuous control can be achieved. This actuator actually has two output shafts, one at the top and one at the bottom (the four mounting holes on the upper part can be used to connect valves as shown in the original diagram)