The 8\" on-off valve requires a shut-off time of 1.5s and is equipped with a single-acting actuator; how should I choose the pneumatic accessories? Please advise
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Initially, it was planned to use a pressure reducing and filtering valve, a solenoid valve, a pneumatically controlled valve, and two quick-release valves. The pneumatic control valve is located after the solenoid valve and before the cylinder; its function is merely to increase the flow capacity ； Is it feasible to connect a quick-release valve in series behind the cylinder? Do all these attachments need to have a 1/2NPT interface?
Help, I’m a beginner and really know nothing about air circuit accessories
Only the quick exhaust valve requires consideration for the interface; the larger, the better. If a low displacement is required, a 1/2 interface will meet the requirements; otherwise, a larger interface is needed.
This post was last edited by wangsir85 on 2018-7-12 at 12:32. Choosing a larger actuator is also crucial, as it provides greater output force; in addition, the air supply port should be large as well. Of course, quick-release valves and air-controlled valves are essential. The interfaces for filter pressure relief valves, air-controlled valves, and quick-release valves should be large, while the interface for solenoid valves is 1/4.
Thank you, but why is a 1/4 size used for the single solenoid valve?
Also, I remember that in the previous air circuit diagrams, there were two quick-release valves connected in series behind the cylinder. Does installing these two quick-release valves in this way have a cumulative effect?
The solenoid valve’s pilot air control valve regulates the air circuit. It’s 1/4 cheaper. The required shutdown time is 1.5 seconds, and it’s a single-action actuator – so is it FC or FO? If it’s FO, you need to consider the pneumatic circuit rather than speeding up the exhaust valve.
For FC, what about considering it as FO?
When the intake valve of the FO actuator is closed, you need to consider what size gas supply piping and accessories are required to achieve 1.5S. For a simple algorithm, the actuator capacity Q/CV is approximately equal to the actuation time, with the CV value taken as the smallest CV in the main air circuit.
1. The solenoid valve is small because it is merely used to control the position of the pneumatic valve; as a result, it is small in size and inexpensive. After all, a pneumatic valve is already included. 2. The quick exhaust valve is installed directly at the air inlet of the cylinder; its purpose is to allow the air from the cylinder to be discharged directly through the cylinder’s outlet, without having to return to the air control valve for discharge (in cases where there is no air control valve, it doesn’t need to go to the solenoid valve’s outlet either). This way, the exhaust process does not have to take place through the air supply circuit, thus reducing the time required.