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Principles of Hydraulic Systems Design, Second Edition by Peter Chapple

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CHAPTER 4

PRESSURE CONTROL VALVES

4.1  INTRODUCTION

Major types of valves that are used to control the pressure level in hydraulic systems include:

  • Relief valves for limiting the maximum system pressure.
  • Reducing valves for limiting the pressure in parts of a circuit at a lower level than in the supply system.
  • Load control valves to control the motion of an actuator or motor under the action of overrunning, or negative, forces.

The type that is employed in a given application depends on the particular requirements and system specification.

4.2  RELIEF VALVES

Relief valves are the most commonly used pressure control valve as they are required in all systems to prevent the generation of excessive pressures. In many systems they are used in combination ...

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