Pneumatic 4/2 and 5/3 valves ??

I'm not sure if valve is the right name in english,

If u have a double working cilinder, the you cannot use 3/2 and need 4/2 valve, or 5/3.

When do u use 4/2 and when 5/3 ?

Is 5/3 good for emergency stops ? I mean, when their is such a stop, the compressed air is cut and u don't want to have a motion anywhere ?

And 4/2 for general applictaions then ...


Just for updating my pneumatic knowledge

May want to check out some tutorials on the subject:
http://www.patchn.com/hydrauli.htm

http://www.patchn.com/forum1/viewtopic.php?t=420

The fist number are ports and second number is positions i.e. 4/2 is 4 port 2 position. What to use is dependent on application needs, it is not as simple as you stated.

Is 5/3 good for emergency stops ? I mean, when their is such a stop, the compressed air is cut and u don't want to have a motion anywhere ?

Click to expand...

For such an application, it is not enough to cut the supply air. Be sure that the air on the output side is vented in the inactive (middle position).

Originally posted by JesperMP:

For such an application, it is not enough to cut the supply air. Be sure that the air on the output side is vented in the inactive (middle position).

Click to expand...

...unless such an action will increase the level of the hazard. Your hazard assessment should be able to tell you that. I have had cases in the past where an all ports blocked center position was deemed a safer option than center exhaust.

But, then again, (for those of you in the US) I am finding I am NOT smarter than a 5^th grader. So take my responses for what they are worth.

Keith