In this lesson we will demonstrate how a pilot operated relief valve functions, and why it's often chosen for high-pressure, high-flow applications.
A balanced relief valve is made up of a main poppet and a pilot poppet. The main poppet receives the same pressure on the top and bottom of it, so the minimal extra pressure from the spring is all that’s required to keep it closed.
The advantages of a balanced, pilot operated valve are that it:
While many schematic drawings would still show a simple relief valve symbol for a balanced, pilot operated relief valve, a more complete and accurate symbol might look like one of these drawings below.
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