SUN HYDRAULICS
XQEHLANEX
$1,074.30 USD
Tags:
- SUN HYDRAULICS
- Material:XQEHLANEX
- Model:XQEH-LAN-EX
- Summary:Y-assembly
Quantity in stock: 0
***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 XQEHLANEX (Material Number: XQEHLANEX) is a specialized valve assembly designed for efficiently charging an accumulator with a fixed displacement pump. This assembly automatically unloads the pump when the pressure reaches a predetermined set point and re-engages it when the pressure drops to a specific value, as determined by the pilot valve's fixed percentage. It features a ventable relief that acts both as a main stage for unloading and as an overpressure relief system. Additionally, it includes mechanisms to soften pump unloading and allows for remote sensing of accumulator pressure, which is highly recommended to minimize errors in the circuit. For optimal operation, this assembly requires a separate drain line to avoid erratic behavior due to tank line pressure fluctuations. The design emphasizes careful selection of adjustment ranges due to potential influences from system pressure drops and flow rates on unloading valves' performance. The assembly's porting is intentionally large relative to its capacity, encouraging large piping use to reduce issues from flow-induced pressure drops. Notably, the spool design of the pilot valve ensures consistent differential ratios by using diameters on the spool that resist wear over time. It\u2019s crucial that the accumulator pilot valve is set below any reliefs on the pump side to prevent excessive heating. The included relief serves as an overpressure device, set higher than the pilot valve's maximum setting. The assembly supports a capacity of 20 gpm (80 L/min) and is designed for line mounting with through mounting holes measuring .41 inches (10.4 mm) in diameter.
The Sun Hydraulics XQEHLANEX (Material Number: XQEHLANEX) is a specialized valve assembly designed for efficiently charging an accumulator with a fixed displacement pump. This assembly automatically unloads the pump when the pressure reaches a predetermined set point and re-engages it when the pressure drops to a specific value, as determined by the pilot valve's fixed percentage. It features a ventable relief that acts both as a main stage for unloading and as an overpressure relief system. Additionally, it includes mechanisms to soften pump unloading and allows for remote sensing of accumulator pressure, which is highly recommended to minimize errors in the circuit. For optimal operation, this assembly requires a separate drain line to avoid erratic behavior due to tank line pressure fluctuations. The design emphasizes careful selection of adjustment ranges due to potential influences from system pressure drops and flow rates on unloading valves' performance. The assembly's porting is intentionally large relative to its capacity, encouraging large piping use to reduce issues from flow-induced pressure drops. Notably, the spool design of the pilot valve ensures consistent differential ratios by using diameters on the spool that resist wear over time. It\u2019s crucial that the accumulator pilot valve is set below any reliefs on the pump side to prevent excessive heating. The included relief serves as an overpressure device, set higher than the pilot valve's maximum setting. The assembly supports a capacity of 20 gpm (80 L/min) and is designed for line mounting with through mounting holes measuring .41 inches (10.4 mm) in diameter.
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. The assembly has two additional features; a simple circuit that softens the unloading of the pump 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.
Capacity | 20 gpm80 L/min. |
Body Type | Line mountLine mount |
Mounting Hole Diameter | .41 in.10,4 mm |
Mounting Hole Depth | ThroughThrough |
Mounting Hole Quantity | 22 |
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Additional Resources
- Integrated Packages: Solutions That Grow Your Reputation
- Fluid and Temperature Recommendations
- Sun's Floating Style Screw-In Cartridge
- Sun Model Code Explanation; 999-901-334
- Custom Integrated Packages from Sun
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.