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Unread 14-08-2014, 17:41
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Re: Pneumatic Restrictions & Improvments

Quote:
Originally Posted by jwfoss View Post
One of the reasons many teams love pneumatics is the speed at which they actuate, I seriously hope this does not become a rule. We loved having the ability to use a valve with a higher Cv value this year specifically.
I think you are confused what a soft start valve does, it only works only when the system is being initially charged. Once it reaches the open transition pressure the main valve opens that value does not close until the system reaches close transition pressure. I have an smc on my desk that has an open/close transition pressures of 3/.5 bar and is rated 10m^3/h; much higher than a FRC team would need/use. Plus it is only about 1.5x1.5x2.5" in size and weights a few ounces.

The sole job of the valve is to pressurize the system slowly to prevent the large initial pressure surge that can cause a cylinder rapid to the end of its travel.

On the field when teams uses external compressors that have a a few tanks attached, they turn the ball valve and you can see this jump clear as day. This usually happens during the down between a match and its replay. I personally saw this two or three times this year alone.

On the the pressure transducer the sunx is nice because you can configure the limits of the dio which makes it a programmable pressure switch combined with a digital gauge and a 0-10V analog for pressure feedback. All this can be done in the same package instead of three. This was really more about convinence than anything else.