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Sun Hydraulics-QCDAKDV-QCDAKDV

SUN HYDRAULICS
QCDAKDV


$210.48 USD
  • SUN HYDRAULICS
  • Material:QCDAKDV
  • Model:QCDA-KDV
  • Summary:Cartridge

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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 QCDAKDV (Material Number: QCDAKDV) is an accumulator sense, pump unload pilot valve designed to manage pressure in hydraulic systems. It senses pressure at port 2 and, upon reaching the preset level, connects port 3 to port 4 to vent a relief valve and unload the pump. This valve features a 15:1 ratio between unload setting and reset, allowing the pump to recharge the accumulator when pressure drops below 85% of the set value. It includes an integral free-flow check valve suitable for pump flows up to 15 gpm (60 L/min), with an alternative version available for higher capacity pumps. The design ensures a fixed differential ratio due to spool diameters that resist wear. Additionally, minimal clearances and a sealed pilot piston reduce silting risks. A separate drain line is necessary for stable operation against tank line pressure fluctuations. The valve\u2019s construction minimizes internal binding risks from installation torque or machining variations. Key specifications include a maximum operating pressure of 5000 psi (350 bar), check cracking pressure of 4 psi (0.3 bar), and pilot flow capacity of 46 in\u00b3/min (0.75 L/min). Installation requires specific torques for various components, ensuring secure setup without over-tightening that could affect performance. This product is ideal for applications needing precise control over hydraulic system unloading and recharging cycles, particularly where system design must account for varying pressures and flow rates that influence unloading valves' operation efficiency.

The accumulator sense, pump unload pilot valve is used to sense pressure in an accumulator at port 2 of the valve and when the pressure at port 2 reaches the valve setting, port 3 connects to port 4 to vent a relief valve and unload the pump. This valve has a 15% ratio between unload setting and reset; when pressure at port 2 falls below 85% of the valve setting, port 3 is blocked from port 4 and the pump will come back online to recharge the accumulator. The integral free-flow check valve is suitable for pump flows up to 15 gpm (60 L/min). For higher capacity pumps, another version of accumulator sense, pump unload cartridge, QPAA, which requires a separate check cartridge is available.

  • The pressure differential between unload and reset will be within +/- 1% of the stated ratio of the valve with up to an additional 25 psi (1,7 bar) due to dynamic seal friction.
  • The accumulator sensing area is positively sealed.
  • The spool design of this 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.
  • Minimum clearances between the spool and sleeve and a seal on the pilot piston diameter significantly reduce the potential for silting.
  • When applying this cartridge, 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.
  • Sun has designed a variety of standard accumulator/pump unload assemblies with a variety of features. These assemblies can be found on our website under SOLUTIONS: ACCUMLATOR SENSE, PUMP UNLOAD.
  • Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
CavityT-21A
Series1
Capacity15 gpm60 L/min.
Maximum Operating Pressure5000 psi350 bar
Check Cracking Pressure4 psi0,3 bar
Pressure Drop, Port 1 to Port 2100 psi@15 gpm7 bar@60 L/min.
Pilot Flow Capacity46 in³/min.0,75 L/min.
Adjustment - Number of Clockwise Turns to Increase Setting55
Valve Hex Size7/8 in.22,2 mm
Valve Installation Torque30 - 35 lbf ft41 - 47 Nm
Adjustment Screw Internal Hex Size5/32 in.4 mm
Locknut Hex Size9/16 in.15 mm
Locknut Torque80 - 90 lbf in.9 - 10 Nm
Model Weight.35 lb0,15 kg
Seal kit - CartridgeViton: 990-021-006

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