Hydraulic components - Flow control valve
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The purpose of a flow control valve is to regulate the flow rate in a specific portion of a hydraulic circuit. In hydraulic systems, they’re used to control the flow rate to motors and cylinders, thereby regulating the speed of those components.

Hydraulic flow control valves also control the rate of energy transfer at a given pressure. This is based on the physics concept surrounding work, energy, and power:
 
There are a variety of flow control valve designs, with most intended for specific applications. Therefore, understanding how hydraulic flow control valves work is crucial in selecting the right valve for an application. The most common types of flow control valves include: Hydraulic Flow Control Valve
  • Ball
  • Diaphragm
  • Needle
  • Butterfly
  • Plug