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Sun Hydraulics-QCDBCAN-QCDBCAN

SUN HYDRAULICS
QCDBCAN


$182.57 USD
  • SUN HYDRAULICS
  • Material:QCDBCAN
  • Model:QCDB-CAN
  • Summary:Cartridge

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 QCDBCAN (QCDBCAN) is an accumulator sense, pump unload pilot valve designed to efficiently manage hydraulic systems by sensing pressure at port 2. When the pressure reaches the set point, it connects port 3 to port 4 to vent a relief valve and unload the pump. This valve features a 20:1 ratio between unload setting and reset, ensuring that when pressure drops below 80% of the set point, the system recharges. It includes an integral free-flow check valve suitable for pump flows up to 15 gpm (60 L/min). For higher capacity needs, a different model, QPAB, is recommended. The valve maintains precise operation with a pressure differential within 1% of its ratio plus up to an additional 25 psi due to dynamic seal friction. Its spool design ensures durability and consistent performance by maintaining fixed differential ratios. The design also minimizes silting potential through minimal spool-sleeve clearances and a pilot piston seal. A separate drain line is necessary to prevent erratic operations from tank line pressure fluctuations. System designers must carefully select adjustment ranges due to potential impacts from system pressure drops and flow rates on unloading valves' operation. High flow rates can lead to significant pressure drops affecting differential performance. Sun Hydraulics offers various standard assemblies for accumulator-pump unload applications, incorporating floating style construction which reduces binding risks due to installation torque or machining variations. The QCDBCAN fits into Cavity T-21A Series 1 with a maximum operating pressure of 5000 psi (350 bar) and check cracking pressure of 4 psi (0.3 bar). It requires specific installation torques and adjustments for optimal functionality and comes with Viton seal kit options for maintenance convenience.

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 20% ratio between unload setting and reset; when pressure at port 2 falls below 80% 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, QPAB, 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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