SUN HYDRAULICS
XQGELANDP

$742.50 USD

Tags:

SUN HYDRAULICS
Material:XQGELANDP
Model:XQGE-LAN-DP
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 XQGELANDP (XQGELANDP) is a sophisticated valve assembly designed to efficiently manage the charging of an accumulator using a fixed displacement pump. This system automatically unloads the pump when the pressure reaches a predetermined set point, and re-engages it when the pressure drops to a value determined by the fixed percentage of the pilot valve, ensuring optimal accumulator recharge. The ventable relief valve serves dual functions: unloading the pump and acting as an overpressure safety device for the system. A separate drain line is essential for this assembly to prevent erratic operations due to fluctuations in tank line pressure. When selecting this assembly, careful attention should be paid to adjustment ranges, as low operating pressures and low differentials can create narrow bands between unload and reset pressures, necessitating precise system design. High flow rates may lead to significant pressure drops, impacting differential management by the valve. The pressure setting references port 1 area of the QPA pilot valve, with inherent differences in pump and accumulator pressures due to flow-induced drops. The assembly features large porting relative to its capacity, encouraging large piping use to minimize flow-induced pressure drop issues. The spool design of the pilot valve maintains a fixed differential ratio due to its durable construction that resists wear over time. It's crucial that the accumulator pilot valve is set below any reliefs on the pump side to avoid severe heating. The relief in this package acts as an overpressure device set higher than any pilot valve settings and is capped for safety. With a capacity of 40 gpm (160 L/min) and designed for line mounting, this assembly offers robust performance for demanding hydraulic applications.

Description

This valve assembly is meant to charge an accumulator using a fixed displacement pump. When the pressure reaches the set point of the valve, the pump is unloaded. When the pressure drops to the value determined by the fixed percentage of the pilot valve, the pump is brought back on line to recharge the accumulator. The ventable relief serves a dual purpose as a main stage to unload the pump and as a system over-pressure relief.

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.
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.

Capacity	40 gpm160 L/min.
Body Type	Line mountLine mount

Show FAQ

How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Why does Sun use 6061 aluminum?	6061-T651 is relatively strong, relatively inexpensive, difficult to machine, readily available in all shapes and sizes and very corrosion resistant. 2024 is stronger and machines beautifully, but is expensive and falls to pieces in a corrosive environment.
Why doesn't Sun anodize their aluminum bodies?	Reasons to anodize: To increase corrosion resistance. Sun uses 6061-T651 aluminum. It is one of the most corrosion resistant aluminum alloys there is. Whether or not anodizing improves the corrosion resistance of 6061 aluminum is debatable. We have yet to have a manifold returned because of corrosion. Appearance (color). The 2 colors that would appeal to Sun would be blue or black. Unfortunately these are the colors that are hardest to do consistently. To provide a hard wear surface. Sun does not make parts-in-body valves. The manifold is just plumbing. We don't need a wear surface. Because everyone else does it. Bad reason. Reasons to not anodize: Cost. It's another process. Logistics. When you make tens of thousands of manifolds a month and you anodize hundreds, it's a problem. Consistency. See above. Stamping. After a body is anodized you cannot do any more stamping without making a mess.Inspection. Have you ever tried to look for burrs in a black anodized body? It's the old blackboard factory at night scenario. Torque. You will experience an increase in breakaway torque when removing items from an anodized manifold. Fatigue life. This is the best reason to not anodize. Fatigue failure is a very complex phenomenon. What it takes to initiate a crack is difficult to predict. What it takes to propagate a crack is readily defined. Anodizing produces a very thin, very hard, and very brittle surface on aluminum. The first time you pressurize an anodized aluminum manifold you have initiated fatigue cracks. Whether or not the stress is enough to propagate the cracks is a matter of pressure and manifold geometry. Anodizing an aluminum manifold grossly reduces the fatigue life by anywhere from 20% to 50%.
Direct acting or pilot operated - what do I use?	Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

Additional Resources

Notes:

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.

SUN HYDRAULICSXQGELANDP

Additional Resources

SUN HYDRAULICS
XQGELANDP