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Sun Hydraulics-QPACKBN-QPACKBN

SUN HYDRAULICS
QPACKBN


$183.87 USD
  • SUN HYDRAULICS
  • Material:QPACKBN
  • Model:QPAC-KBN
  • 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 QPACKBN (QPACKBN) is an accumulator sense, pump unload pilot valve designed to efficiently manage hydraulic systems. It operates by sensing the pressure at port 1, and once the pressure reaches a predetermined setting, it connects port 2 to port 3 to vent a relief valve and unload the pump. A notable feature is its 30:1 ratio between unload setting and reset; when pressure at port 1 drops below 70% of the set value, port 2 is blocked from port 3, allowing the pump to recharge the accumulator. This valve requires a separate check valve between port 1 and the pump for optimal operation. The spool design ensures a fixed differential ratio due to non-wearing diameters on the spool, minimizing potential silting with tight clearances and seals. A separate drain line is necessary to prevent erratic operations from tank line pressure fluctuations. The valve features Sun's floating style construction to reduce internal binding risks due to installation torque or machining variations. With a maximum operating pressure of 5000 psi (350 bar) and a capacity of 46 in\u00b3/min (0.75 L/min), this valve is robust for various applications requiring precise control over accumulator unloading processes. Adjustments can be made with up to five clockwise turns, with specific torque requirements for installation and locknut adjustments provided for secure fitting.

The accumulator sense, pump unload pilot valve is used to sense pressure in an accumulator at port 1 of the valve and when the pressure at port 1 reaches the valve setting, port 2 connects to port 3 to vent a relief valve and unload the pump. This valve has a 30% ratio between unload setting and reset; when pressure at port 1 falls below 70% of the valve setting, port 2 is blocked from port 3 and the pump will come back online to recharge the accumulator. This valve requires a separate check valve between port 1 and the pump. Another version of the accumulator sense, pump unload valve, QCDC, includes a free-flow check valve for pump flows under 12 gpm (50 L/min).

  • 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-11A
Series1
Capacity46 in³/min.0,75 L/min.
Maximum Operating Pressure5000 psi350 bar
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: 990-011-006

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