Direct Acting Relief Valves

Objectives

  • Explain the function of a direct acting relief valve
  • 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.

Recognize this relief valve? This is the R1E from Denison; it's one of the most popular direct acting relief valves around.

Schematic Symbols

Adjustment
Body
Spring
Poppet
P
T
Graphic Cutaway
Adjustment
Body
Spring
Poppet
P
T
Schematic Symbol

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.

P
T
P
T
P
T

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We hope you enjoyed Direct Acting Relief Valves

Vacuum Pressure
Atmospheric Pressure
Low Pressure
Medium Pressure
High Pressure
Ground/Common
Lowest Voltage
Medium Voltage
Highest Voltage
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