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A valve holding back a load against gravity.
Also known as: Load holding valve symbol, Overcentre valve symbol
In ISO 1219 fluid power diagrams a counterbalance valve is drawn as a normally closed pressure valve with an integral bypass check valve, holding a suspended load until pressure is applied to lower it.
Denotes a valve that holds a load against gravity and releases it under control, with a check valve allowing free flow in the opposite direction.
Contexts: Technical drawing
Prevents a suspended load from running away by overhauling the pump, which is a safety function rather than a control convenience.
Contexts: Technical drawing
A square with a blocked flow path and a spring, drawn alongside a check valve symbol permitting free flow in the return direction.