Historical
NFPA/T3.28.9 R1-1989 (R2009)
Fluid power systems and products - Moving parts fluid controls - Method of diagramming
Includes the updating of existing graphic symbols for fluid logic devices and circuits by developing symbols for the following: a) sensing and input devices commonly used with fluid logic systems; b) interface devices commonly used with fluid logic systems; c) accessory devices commonly used with fluid logic systems; d) logic symbols.
National Fluid Power Association [nfpa-fluid]
