Pressure Control Valves in Hydraulic Circuit

Pressure control is the most important element in hydraulic circuit. Hydraulic components are designed to operate on a specific pressure range with capability to withstand some burst peak pressure. These components can be damaged if the working pressure exceeds its maximum pressure for a long period of time. The damage can injure nearby workers or damaging other equipment.

The pressure control serves as a pressure limiter to keep the working pressure below the lowest rated component in the hydraulic circuit. There are commonly six pressure control device in hydraulic circuit:

1. Relief valves
2. Unloading valves
3. Sequence valves
4. Pressure-reducing valves
5. Counterbalance valves
6. Brake valves

The basic principle of each of these valves is; a spring force balances a hydraulic force. The hydraulic force is produced by pressure acting on a given area. The valve spool will moves if the hydraulic force become greater than the spring thrust.



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