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Old 11-18-2012, 03:42 PM   #23 (permalink)
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Join Date: Oct 2007
Location: Plattsburgh, NY

The SMAV-3 is a 3-way that can be plumbed normally open or normally closed. An MSV or MSV-2 is a 3-way that can only be plumbed normally closed - but is also not cylindrical and is quite a bit larger than an SMAV-3.

You can use a cocker ram with a 3-way, just hook a constant air supply to the side with that the rod comes out of and cycle the air only on the back side. No need to find a spring return ram. Just uses the different surface areas on each side of the piston to control the movement. You will have a lower force extending the ram than if you were using a 4-way, but the retract force would be the same as normal.
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