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A diamond with arrows pointing inward, adding heat.
Also known as: Fluid heater symbol, Oil heater symbol
In ISO 1219 fluid power diagrams a heater is drawn as a diamond containing arrows directed inward, showing heat being added to the fluid.
Denotes a heater adding heat to the fluid.
Contexts: Technical drawing
Is fitted where a circuit must start in cold conditions, since cold fluid is too viscous to pump properly.
Contexts: Technical drawing
A diamond containing two arrows pointing inward from opposite corners towards its centre.