The Old Timer Part 23: A Lesson in Air Valve Center Positions

Hitchcox, Alan
May 2013
Hydraulics & Pnuematics Exclusive Insight;5/24/2013, p7
A reprint of an article about air valve center positions that was originally published in the November 1989 issue is presented. It describes the design for a light-duty transfer system using a pneumatic cable cylinder operated by a directional control valve. The use of a dual-pressure center in the main valve and upstream check valves to resolve problems is addressed. Improvements in spool valve designs and air preparation technologies are also cited.


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