Direct Acting Relief Valves
In this lesson we will explain the function of a direct acting relief valve and list advantages and disadvantages of the direct acting design.
What Is a Direct Acting Relief Valve?
A direct acting relief valve is the most basic of the pressure controls, consisting of only one poppet and one spring. It is used to limit maximum system pressure.
The advantages of a direct acting style of relief valve are that it is:
- inexpensive
- fast-acting
- simple
This valve is good for controlling sudden, momentary pressure spikes. It can also be used as a pilot control for other valves.
Schematic Symbols
Below are some variations of the schematic symbol for a direct acting relief valve. The P label is the inlet port from the pump and the T label is the port that leads back to tank.
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