What do circles, semi circles, squares, rectangles, diamonds and lines represent in hydraulic schematics?
Circles and semi-circles are used to represent rotary devices such as pumps or motors. Triangular arrows represent the direction fluid takes in the pump or motor.
• When circles represent pumps, the arrow faces outwards.
• When circles represent motors, the arrow faces inward.
• Motors are often bi-rotational and have triangles at both the top and bottom of the circle. This represents fluid is able to enter at either port.
• Pumps can also have motors
Diamonds represent conditioning devices such like filters, heaters, and coolers.
Back-to-back semi circles and arrow heads represent flow control elements, either viscosity dependent or viscosity independent.
Saw Tooth Symbols represent springs.
In hydraulic power diagrams, lines are another commonly used symbol.
• Continuous lines represent flow lines.
• Dotted lines indicate pilot signals and drains
• Dash-dot lines are used to show an enclosure outline that represents a grouping of components such as a directional control valve