Dual overcenter valves
Balancing valves are essential components in hydraulic systems, particularly in construction machinery and other equipment where loads are lowered by gravity. These valves feature a sophisticated hydraulic circuit that harmonizes the return oil back pressure with the fluctuating load, ensuring the load can be dependably halted at any designated position. Furthermore, they meticulously manage the balance and movement when the load is lowered, preventing excessive speed that could damage structural components, hydraulic parts, and pipelines.
Overcenter valves serve a critical role in controlling the stop and motion of an actuator. Single overcenter valves manage one directional movement, while dual overcenter valves proficiently handle motion in both directions, ensuring seamless operation and precise control.
Functions:
- Load lowering control: The load can only be lowered if there is pilot pressure from the opposite line, ensuring the smooth supply of oil to the cylinder and preventing cavitation issues.
- Containment of pressure: These valves maintain the pressure at a set value and provide pressure relief during peaks caused by shocks or overloads, safeguarding the system.
- Flow arrest: They halt the flow (and the load) when the pump is inactive or the directional valve is in a neutral position, providing reliable stopping power.
- Free flow for load lifting: They allow free flow during load lifting with minimal pressure drops, enhancing operational efficiency.
Composition:
- Check valve: Permits flow in a single direction, ensuring controlled and unidirectional movement.
- Pilot piston: Enables the gradual opening of the relief valve for precise control.
- Relief valve: Limits maximum pressure within the actuator, supports the load, and controls its descent through pilot signal activation, ensuring safe and stable operation.
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