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SUN HYDRAULICS
XQILLANCY


$2,133.00 USD

Tags:

  • SUN HYDRAULICS
  • Material:XQILLANCY
  • Model:XQIL-LAN-CY
  • Summary:Y-assembly

Quantity in stock: 0

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***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics XQILLANCY (Material Number: XQILLANCY) is a sophisticated valve assembly engineered for charging an accumulator using a fixed displacement pump. This assembly features a ventable priority flow control valve that optimizes system efficiency by redirecting pump flow once the accumulator reaches its set pressure. When the system pressure decreases to a predetermined level, the priority flow recharges the accumulator, allowing excess flow to continue powering the system. The assembly includes three key features: a circuit that softens pump unloading, an overpressure relief system, and provisions for remote sensing of accumulator pressure. Key specifications include a capacity of 120 gallons per minute (480 liters per minute), and it is designed for line mounting with .375-16 UNC 2B mounting holes at a depth of .88 inches. The assembly requires careful consideration of adjustment ranges due to potential impacts from system pressure drops and flows on unloading valve operation. It is crucial to install a separate drain line to mitigate erratic performance caused by tank line pressure fluctuations. Remote sensing capabilities are highly recommended to minimize errors in accumulator pressure readings, ensuring more precise control over the hydraulic system. The porting is deliberately oversized relative to capacity, encouraging the use of large piping to reduce flow-induced pressure drops. Additionally, the spool design maintains a fixed differential ratio due to its durable construction that resists wear. This product is best suited for applications where maintaining precise hydraulic control and efficiency is critical, particularly in systems requiring reliable accumulator charging and management under varying operational conditions.

This valve assembly is meant to charge an accumulator using a fixed displacement pump. It incorporates a ventable priority flow control valve. When the pressure reaches the set point of the valve, the priority flow control is vented and all of the pump flow is available to the system. When the pressure drops to the value determined by the fixed percentage of the pilot valve, the priority flow is used to recharge the accumulator. Only the priority flow is directed to the accumulator leaving the rest of the pump flow available to the system. The assembly has three additional features; a simple circuit that softens the unloading of the pump, a system over-pressure relief, and provisions for remote sensing of the accumulator pressure.

  • When applying this assembly, a separate drain line is required to prevent erratic operation caused by tank line pressure fluctuations.
  • NOTE: Careful consideration should be given when selecting an adjustment range. System pressure drops and flows tend to affect the operation of unloading valves. Low operating pressures combined with low differentials result in a very narrow band between unload and reset, requiring precise system design. High flow rates typically mean high pressure drops, which subtract from the differential the valve has to work with.
  • The pressure setting and the resultant reseat pressure are in reference to the port 1 area of the QPA* pilot valve. Pump pressure will be higher and accumulator pressure will be lower due to pressure drop caused by flow. Use of the remote sense for accumulator pressure will minimize the error on the accumulator side of the circuit. Use of the remote sense is highly recommended.
  • The porting on this assembly is large in relation to its capacity. This is done to encourage the use of correspondingly large piping to minimize problems caused by flow induced pressure drop.
  • The spool design of the pilot valve allows it to maintain a fixed differential ratio because the areas are created by diameters on the spool that will not wear or change with use.
  • The accumulator pilot valve must be set below any reliefs in the pump side of the system or severe heating could occur.
  • The relief in this package is meant to be an over-pressure device. It is set higher than the highest setting of the pilot valve and capped.

Capacity120 gpm480 L/min.
Body TypeLine mountLine mount
Mounting Hole Thread.375-16 UNC - 2B in..375-16 UNC - 2B in.
Mounting Hole Depth.88 in.22,4 mm
Mounting Hole Quantity33

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Notes:
  • Some applications may require additional volume for a smoother shift. Should this become necessary, an auxillary port has been provided to attach a length of hose for additional volume.
  • Remote sensing of accumlator charge pressure can be achieved by interchanging cavity plugs XZCC and XZOC, and connecting RS port to Accumulator.
  • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.