Don't Use A Needle Valve To Control Your Air Cylinder Speed!

Numerous mechanical machines utilizing compacted air as a fuel source, use air cylinders or other pneumatic actuators to accomplish the genuine work. 
Compacted air is 'unstable' as it moves from high strain to low tension on it's way back to climate. That implies when the air valve moves and air streams to the cylinder, the cylinder and pole moves incredibly rapidly. A rapid cylinder pole may not be best for your application, and you will need to decrease the speed and the effect. 
One simple technique for controlling the speed of an air cylinder is introducing stream controls in the air lines between the valve to the air cylinder, in the cylinder ports themselves, or even in the fumes ports of the air valve, however, the last is least attractive. 
In the 'valve exhaust,' type stream control the controls themselves might be far enough away from the cylinder that the cylinder and bar may have ventured to every part of the full stroke before the fumes stream control can begin back-constraining the line to slow the cylinder. Cylinder control response time is in every case adversely influenced relying upon the separation from the cylinder to the stream control. 
A few people select needle valves to choke the progression of air into and out of the air cylinder, in this way decreasing its speed. The issue with utilizing a needle valve to control the speed of an air cylinder is that it chokes the compacted air stream similarly in the two ways.

On the off chance that you are utilizing a bigger cylinder, by choking the air into the cylinder, you are really forestalling the smooth cylinder stroke wanted. As air pressure works in the cylinder it will arrive at where it conquers the rubbing of the cylinder and bar seals and the cylinder will begin to move. As it moves, it expands the volume of the air space inside the cylinder behind itself. The cylinder advances toward one finish of the cylinder making a bigger territory behind it than before it. This is a zone into which air needs to stream rapidly to guarantee that the cylinder continues moving. In the event that the air inrush can't stay aware of the expanding cavity size, there will be an inadequate strain to keep the cylinder moving, and it will stop. So too will your cylinder bar, and whatever tooling you have introduced on the finish of it. 
The dependable guideline for utilizing a stream control to decrease and smooth air cylinder go is to just choke the fumes air from the cylinder. The air streaming into the cylinder port ought to never be diminished.

How is this refined? 
Utilize a "cylinder stream control". This is a gadget that may not appear to be any unique from the needle valve. Inside, in any case, there is a "needle sidestep" which permits the air to sidestep the needle which is choking the air accomplishing full progression of air unidirectionally. 
The "free stream" of compacted air through the cylinder stream control permits the unit, when it's introduced in the right direction, to give full and un-choked inrush of air to the cylinder, yet, when the valve has moved and the twofold acting air cylinder has switched, the air that is currently streaming out of the cylinder is choked to the level important to accomplish the cylinder speed wanted. 
There will be a subsequent cylinder stream control on the other line as well, and this works the very same way. The air cylinder manufacturer ready to customize the bore size and stroke as per the requirement.
Thus, air stream into the cylinder ports at one or the flip side of the cylinder is absolutely unrestricted giving high-power cylinder development. The cylinder is attempting to go quickly and at full force, however since the fumes stream of air is hindered by the cylinder stream control, the cylinder moves with full force, yet at a controlled and wanted rate. 
Most cylinder stream controls will have a schematic as an afterthought demonstrating the stream ways to guarantee that they are introduced effectively. 
Some cylinder stream controls are outfitted with sealant covered male strings for screwing into the cylinder port, and with a "moment" type finding a way into which the cylinder airline can be rapidly fitted, highlights that set aside time and cash.