[23] Circuit symbols for flow control valves
A distinction is made in
flow control valves between types which are affected by viscosity
and those which are unaffected. Flow control valves unaffected by
viscosity are termed orifices. A 2-way flow control valve
consists of restrictors, one adjustable restrictor which is
unaffected by viscosity (orifice) and a regulating restrictor
(pressure compensator). These valves are represented by a
rectangle containing the symbol for the adjustable restrictor and
an arrow to represent the pressure compensator. The diagonal
arrow through the rectangle indicates that the valve is
adjustable.