Hydraulic systems & components


Adjustable priority flow control solutions

Fourth Quarter 2019 Hydraulic systems & components

Sun Hydraulics has developed a range of customisable, adjustable priority flow control solutions. These provide simple, efficient control of auxiliary hydraulic power to a range of mobile equipment attachments. They also have wider application in general attachment controls and applications where priority flow control is required, for example in steering control and concrete mixing. The new circuits provide a simple, efficient way to supply auxiliary hydraulic power to attachments like rock breakers or hydraulic hammers attached to skid steers, backhoes or excavators. They can also function as an unloading valve for fixed displacement pumps in applications requiring two or more functions operated by a single pump.

These adjustable priority flow control solutions provide several significant advantages:

• High-quality, durable valves made with all hardened parts.

• Significantly reduced pressure drops from valves and cavities.

• Zinc-nickel coating for improved corrosion resistance.

• Wide range of options available for different applications.

• Solenoid-selectable pressure options.

• Manually adjustable XMD with electro-hydraulic flow control.

Examples of adjustable priority flow control solutions that leverage Sun technologies for efficient control of mobile equipment attachments are:

• An adjustable orifice ensures a stable flow rate for a given needle valve setting. The flow sharing is achieved with very low pressure losses across the needle valve and modulating element and is independent of the pressure.

• Selectable priority flow with pressure limiting option, allowing the operator to switch the priority flow on and off easily.

• Electro-proportional priority flow control for very stable, continuous flow for a given command signal to control demanding applications like hydraulic hammers and rock breakers.


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