Is there any way to find a Speed valve Flow Control Pneumatic Connector that I can control it without using a mechanically.
I mean the speed of the flow
However, they will likely be more expensive than mechanical flow controls, and they’re probably not legal for use in FRC if this was your intention.
There are mechanical valves that can reduce the speed of the air flow.
I used these to slow down the movement of 2 pneumatic cylinders.
Something like this.
https://www.alliedelec.com/smc-corporation-as2201f-n01-07s/70071623/
Dave
Thank you
Yes I use them, But I need advice not mechanical valves to control the speed of Flow of the air
I think we’re a little confused by your request.
Do you want to control the speed of a pneumatic cylinder electronically?
What application would you use them for?
If it’s to control the speed of a pneumatic cylinder, I doubt it will respond fast enough. Those types of valve are generally used for continuous flow applications.
Those will only slow the cylinder to a specific speed. It cannot dynamically control the speed of a cylinder.
Something like this ( http://ph.parker.com/us/12051/en/oem-ep-miniature-pressure-controller ) with a spring return and position detection cylinder (Internal potentiometer) will work … and you could even dictate how far you want the cylinder to extend.
I understood that the OP wanted to throttle the speed of the airflow mechanically (with a hand valve), not electronically on the fly. If I’m wrong though, you don’t necessarily need a fancy servo valve or electronic regulator. Teams have had success sending a PWM signal to a regular old solenoid valve.
(I just spent 15 minutes unsuccessfully looking for a half remembered 2014 reveal video of a pneumatic catapult shooting from a half-dozen locations on the field, but I can’t remember who it was now)
I read it as just the opposite, IE not using a mechanical needle valve.
Most PWM generators cannot produce enough current to drive a valve. That being said, your suggestion would work with some lower current valves.
Truly, it depends on the OPs application.
I still like being able to extend a valve to what ever length I want :ahh:
Sorry for that confused, I am looking to regulate the speed of Flow of the air electronic controller, if there is.
Not the pressure controler
Let’s see if I can translate properly:
You want to use an electronic (not mechanical) method to control the speed of air flowing past a point in a pneumatic system.
In other words, something like http://www.andymark.com/product-p/am-2897.htm, but electronic not “turn the screw”.
I don’t know for sure if something like that exists. If I had to whip something up I’d grab a continuous-rotation servo, attach that to the knob on the linked piece by a method to be determined, and use the servo to adjust the flowrate.
I’m really wondering why you’d need to do that, though…most applications you’d just want to set the speed once.
The item I pointed to in my earlier post has a variable size orifice, which acts essentially like a high speed needle valve.
It can be equipped with a downstream bleed orifice or not. Making it either a pressure controller or a flow controller.
That’s exactly my question:cool:
Here is a demo of a ProportionAir FA electronic speed control for cylinders:
Is this what you want to do?
Festo and SMC also have electronic proportional speed control valves. I don’t see pricing but I’m sure they are very expensive; probably over the maximum part price allowed by FIRST.
A lower cost (but not as smooth) solution would be to have 2 or 3 small solenoid valves connected to the cylinder solenoid valve’s exhaust. Each of these extra valves has a standard mechanical flow control valve attached to it’s exhaust. Then you can open one, two or three of these valves to have a slow, medium or fast cylinder speed.
(Note: Ignore the backwards arrow on the 4/2 solenoid valve)
