Do not use a needle valve to manage your air cylinder speed!
A lot of industrial machines employing compressed air as an power source, use air cylinders or other pneumatic actuators to perform the actual work.
Compressed air is ‘explosive’ as it moves from high pressure to low pressure on it really is way back to atmosphere. That indicates when the air valve shifts and air flows for the cylinder, the cylinder piston and rod moves very swiftly. A high speed cylinder rod may not be finest for the application, and you’ll desire to lessen the speed and also the influence.
1 simple technique of controlling the speed of an air cylinder is installing flow controls within the air lines among the valve for the air cylinder, in the cylinder ports themselves, or even within the exhaust ports in the air valve, although the latter is least desirable.
In the ‘valve exhaust’ kind flow manage the controls themselves may be far sufficient away from the cylinder that the piston and rod may have traveled the full stroke ahead of the exhaust flow control can start back-pressuring the line to slow the cylinder. Cylinder control reaction time is always negatively impacted according to the distance from the cylinder for the flow control.
Some people go for needle valves to throttle the flow of air into and out with the air cylinder, thereby reducing it’s speed. The issue with utilizing a needle valve to manage the speed of an air cylinder is the fact that it throttles the compressed air flow equally in both directions.
Should you be employing a larger cylinder, by throttling the air in to the cylinder, you will be actually preventing the smooth cylinder stroke desired. As air pressure builds inside the cylinder it will reach the point exactly where it overcomes the friction in the piston and rod seals and the piston will commence to move. Because it moves, it increases the volume of the air space inside the cylinder behind itself. The piston moves toward a single end with the cylinder generating a larger place behind than in front of it. This is an place into which air has to flow rapidly to ensure that the piston keeps moving. In the event the air inrush cannot preserve up using the growing cavity size there is going to be insufficient pressure to maintain the piston moving, and it will quit. So also will your piston rod, and whatever tooling you’ve got installed on the end of it.
The rule of thumb for employing a flow control to minimize and smooth air cylinder piston travel is to only throttle the exhaust air from the cylinder. The air flowing in to the cylinder port really should never ever be decreased.
How is this accomplished?
Use a “cylinder flow control”. This is a device that might not look any various from the needle valve. Inside, even so, there is a “needle bypass” which allows the air to bypass the needle which can be throttling the air attaining total flow of air unidirectionally.
The “free flow” of compressed air via the cylinder flow control enables the unit, when it’s installed inside the correct orientation, to give complete and un-throttled inrush of air to the cylinder, yet, when the valve has shifted as well as the double-acting air cylinder has reversed, the air that is now flowing out from the cylinder is throttled towards the level necessary to achieve the cylinder speed desired.
There will probably be a second cylinder flow manage on the other line as well, and this functions precisely the identical way.
Consequently, air flow in to the cylinder ports at either end with the cylinder is totally unencumbered offering high-force piston movement. The piston is trying to go quick and at full energy, but since the exhaust flow of air is impeded by the cylinder flow manage, the piston moves with complete energy, but at a controlled and desired rate.
Most cylinder flow controls will possess a schematic on the side displaying the flow paths to make sure that they are installed properly.
Some cylinder flow controls are equipped with sealant coated male threads for screwing in to the cylinder port, and with an “instant” sort fitting into which the cylinder air line might be rapidly fitted, features that save time and income.
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