Search Error
Solutions
Accumulator Sense, Pump Unload
Loading...
Loading...

Model

XQCHLANBK

   
   
Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
Adjustment Range
  • Additional Options
  • A
    1000 - 3000 psi (70 - 210 bar), 1000 psi (70 bar) Standard Setting
  • B
    500 - 1500 psi (35 - 105 bar), 500 psi (35 bar) Standard Setting
  • C
    2000 - 5000 psi (140 - 350 bar), 2000 psi (140 bar) Standard Setting
  • D
    250 - 800 psi (18 - 55 bar), 250 psi (18 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Pilot Ratio (4th Letter) of Primary Cartridge
  • Standard Options
  • A
    15% (with QPAA primary cartridge, 15%, accumulator sense, pump unload valve - pilot capacity)
  • B
    20% (with QPAB primary cartridge, 20%, accumulator sense, pump unload valve - pilot capacity)
  • C
    30% (with QPAC primary cartridge, 30%, accumulator sense, pump unload valve - pilot capacity)
  • D
    50% (with QPAD primary cartridge, 50%, accumulator sense, pump unload valve - pilot capacity)
  • E
    10% (with QPAE primary cartridge, 10%, accumulator sense, pump unload valve - pilot capacity)
Port and Material Designation
  • Standard Options
  • C
    Ports P, T, SYS 1, SYS 2 — 1/2" NPTF; Ports G1 & G2 — 1/4" NPTF; Ports D, AUX, RS — 3/8" NPTF; Aluminum
  • C/S
    Ports P, T, SYS 1, SYS 2 — 1/2" NPTF; Ports G1 & G2 — 1/4" NPTF; Ports D, AUX, RS — 3/8" NPTF; Iron
  • K
    Ports P, T, SYS 1, SYS 2 — SAE 10; Ports G1 & G2 — SAE 4; Ports D, AUX, RS — SAE 6; Aluminum
  • K/S
    Ports P, T, SYS 1, SYS 2 — SAE 10; Ports G1 & G2 — SAE 4; Ports D, AUX, RS — SAE 6; Iron
  • V
    Ports P, T, SYS 1, SYS 2 — 1/2" BSPP; Ports G1 & G2 — 1/4" BSPP; Ports D, AUX, RS — 3/8" BSPP; Aluminum
  • V/S
    Ports P, T, SYS 1, SYS 2 — 1/2" BSPP; Ports G1 & G2 — 1/4" BSPP; Ports D, AUX, RS — 3/8" BSPP; Iron
Model: XQCH

Accumulator sense, pump unload assembly

Capacity:

Loading...

Model

XQCHLANBK

   
   
Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
Adjustment Range
  • Additional Options
  • A
    1000 - 3000 psi (70 - 210 bar), 1000 psi (70 bar) Standard Setting
  • B
    500 - 1500 psi (35 - 105 bar), 500 psi (35 bar) Standard Setting
  • C
    2000 - 5000 psi (140 - 350 bar), 2000 psi (140 bar) Standard Setting
  • D
    250 - 800 psi (18 - 55 bar), 250 psi (18 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Pilot Ratio (4th Letter) of Primary Cartridge
  • Standard Options
  • A
    15% (with QPAA primary cartridge, 15%, accumulator sense, pump unload valve - pilot capacity)
  • B
    20% (with QPAB primary cartridge, 20%, accumulator sense, pump unload valve - pilot capacity)
  • C
    30% (with QPAC primary cartridge, 30%, accumulator sense, pump unload valve - pilot capacity)
  • D
    50% (with QPAD primary cartridge, 50%, accumulator sense, pump unload valve - pilot capacity)
  • E
    10% (with QPAE primary cartridge, 10%, accumulator sense, pump unload valve - pilot capacity)
Port and Material Designation
  • Standard Options
  • C
    Ports P, T, SYS 1, SYS 2 — 1/2" NPTF; Ports G1 & G2 — 1/4" NPTF; Ports D, AUX, RS — 3/8" NPTF; Aluminum
  • C/S
    Ports P, T, SYS 1, SYS 2 — 1/2" NPTF; Ports G1 & G2 — 1/4" NPTF; Ports D, AUX, RS — 3/8" NPTF; Iron
  • K
    Ports P, T, SYS 1, SYS 2 — SAE 10; Ports G1 & G2 — SAE 4; Ports D, AUX, RS — SAE 6; Aluminum
  • K/S
    Ports P, T, SYS 1, SYS 2 — SAE 10; Ports G1 & G2 — SAE 4; Ports D, AUX, RS — SAE 6; Iron
  • V
    Ports P, T, SYS 1, SYS 2 — 1/2" BSPP; Ports G1 & G2 — 1/4" BSPP; Ports D, AUX, RS — 3/8" BSPP; Aluminum
  • V/S
    Ports P, T, SYS 1, SYS 2 — 1/2" BSPP; Ports G1 & G2 — 1/4" BSPP; Ports D, AUX, RS — 3/8" BSPP; Iron
Function
Function image

Technical specifications

  • Modifiers
    Ports
    • C, C/S
      Ports P, T, SYS 1, SYS 2: 1/2" NPTF; Ports G1 & G2: 1/4" NPTF; Ports D, AUX, RS: 3/8" NPTF;
    • K, K/S
      Ports P, T, SYS 1, SYS 2: SAE 10; Ports G1 & G2: SAE 4; Ports D, AUX, RS: SAE 6;
    • V, V/S
      Ports P, T, SYS 1, SYS 2: 1/2" BSPP; Ports G1 & G2: 1/4" BSPP; Ports D, AUX, RS: 3/8" BSPP;
    Back to Top

    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.
    Back to Top
    • Body Type
      Line mount
    • Capacity
      10 gpm
    • Mounting Hole Diameter
      .41 in.
    • Mounting Hole Depth
      Through
    • Mounting Hole Quantity
      2
    • Why doesn't Sun anodize their aluminum bodies?
    • How big is a drop of hydraulic oil?  
    • Direct acting or pilot operated - what do I use?
      • Back to Top
    • Some applications may require additional volume for a smoother shift. Should this become necessary, an auxillary port has been provided to attach a length of hose for additional volume.
    • Remote sensing of accumlator charge pressure can be achieved by interchanging cavity plugs XZCC and XZOC, and connecting RS port to Accumulator.
    • 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.
    • For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.
    Back to Top

    Keep up with Sun