The new anti-shock relief valves from Sun Hydraulics protect hydraulic components against pressure spikes that could damage machinery during acceleration or deceleration. Pressures can be ramped up or down smoothly, eliminating damage due to rapid pressure changes.
These pilot operated, balanced poppet valves are available in both 2-port and 3-port configurations and as pure pressure relief valves or ventable relief valves where longer ramp time and lower thresholds are required. They also come in different frame sizes. The 3-port version is a ventable relief valve, allowing for remote control by other directional or pressure controls such as Sun’s model RBAP electro-proportional pilot relief valve. As cartridge valves they can be used in a range of body types such as sandwich bodies, line mount bodies, gasket mount bodies and custom assemblies.
These valves have a number of benefits: the controlled rate of pressure rise means there is less dynamic stress; there are no pressure transients above the setting; there is a limited rate of force change; and the life expectancy of hoses and other critical components in the circuit is increased. Typical successful applications are:
* Start-up relief for fixed-displacement pumps to reduce shock and controlled acceleration for longer pump life.
* Cross-line relief in swing circuits and similar hydrostatic systems – especially applications with high inertia loads – to protect motors, hoses and fittings.
* Gentle preloading of drive systems to remove gear backlash and improve reliability.
* Over-pressure protection in systems with damaging pressure spikes – this is easily applied in low-flow or high pressure applications.
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