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Two Pump High-Low Unloading
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Model

YRESLANA

Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
  • W
    Hex Wrench Adjustment
  • Y
    Tri-Grip Handknob
  • Additional Options
  • F
    Hex Head Screw with Locknut
  • J
    Capped Screw Adjustment
  • M
    Capped Screw Adjustment with Lockwire Holes
  • O
    Handknob with Panel Mount
  • Q
    Capped and Lockwired
  • R
    Lockwired Screw Adjustment
  • T
    Tamper Proof - Factory Set
Adjustment Range
  • Standard Options
  • A
    100 - 3000 psi (7 - 210 bar), 1000 psi (70 bar) Standard Setting
  • B
    50 - 1500 psi (3,5 - 105 bar), 1000 psi (70 bar) Standard Setting
  • C
    150 - 6000 psi (10,5 - 420 bar), 1000 psi (70 bar) Standard Setting
  • D
    25 - 800 psi (1,7 - 55 bar), 400 psi (28 bar) Standard Setting
  • E
    25 - 400 psi (1,7 - 28 bar), 200 psi (14 bar) Standard Setting
  • N
    60 - 800 psi (4 - 55 bar), 400 psi (28 bar) Standard Setting
  • Q
    60 - 400 psi (4 - 28 bar), 200 psi (14 bar) Standard Setting
  • W
    150 - 4500 psi (10,5 - 315 bar), 1000 psi (70 bar) Standard Setting
  • Additional Options
  • G
    60 - 3000 psi (4 - 210 bar), 1000 psi (70 bar) Standard Setting
  • H
    30 - 3000 psi (2 - 210 bar), 1000 psi (70 bar) Standard Setting
  • K
    75 - 1500 psi (5 - 105 bar), 1000 psi (70 bar) Standard Setting
  • P
    40 - 400 psi (2,8 - 28 bar), 200 psi (14 bar) Standard Setting
  • V
    150 - 800 psi (10,5 - 55 bar), 400 psi (28 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Primary Cartridge
  • Standard Options
  • A
    A (with RPEC primary cartridge, Pilot-operated, balanced piston relief valve)
  • A
    A (with RPEC8 primary cartridge, Pilot-operated, balanced piston relief main stage with integral T-8A control cavity)
Model: YRES

Two pump high-low unloading assembly

Capacity:

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Model

YRESLANA

Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
  • W
    Hex Wrench Adjustment
  • Y
    Tri-Grip Handknob
  • Additional Options
  • F
    Hex Head Screw with Locknut
  • J
    Capped Screw Adjustment
  • M
    Capped Screw Adjustment with Lockwire Holes
  • O
    Handknob with Panel Mount
  • Q
    Capped and Lockwired
  • R
    Lockwired Screw Adjustment
  • T
    Tamper Proof - Factory Set
Adjustment Range
  • Standard Options
  • A
    100 - 3000 psi (7 - 210 bar), 1000 psi (70 bar) Standard Setting
  • B
    50 - 1500 psi (3,5 - 105 bar), 1000 psi (70 bar) Standard Setting
  • C
    150 - 6000 psi (10,5 - 420 bar), 1000 psi (70 bar) Standard Setting
  • D
    25 - 800 psi (1,7 - 55 bar), 400 psi (28 bar) Standard Setting
  • E
    25 - 400 psi (1,7 - 28 bar), 200 psi (14 bar) Standard Setting
  • N
    60 - 800 psi (4 - 55 bar), 400 psi (28 bar) Standard Setting
  • Q
    60 - 400 psi (4 - 28 bar), 200 psi (14 bar) Standard Setting
  • W
    150 - 4500 psi (10,5 - 315 bar), 1000 psi (70 bar) Standard Setting
  • Additional Options
  • G
    60 - 3000 psi (4 - 210 bar), 1000 psi (70 bar) Standard Setting
  • H
    30 - 3000 psi (2 - 210 bar), 1000 psi (70 bar) Standard Setting
  • K
    75 - 1500 psi (5 - 105 bar), 1000 psi (70 bar) Standard Setting
  • P
    40 - 400 psi (2,8 - 28 bar), 200 psi (14 bar) Standard Setting
  • V
    150 - 800 psi (10,5 - 55 bar), 400 psi (28 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Primary Cartridge
  • Standard Options
  • A
    A (with RPEC primary cartridge, Pilot-operated, balanced piston relief valve)
  • A
    A (with RPEC8 primary cartridge, Pilot-operated, balanced piston relief main stage with integral T-8A control cavity)
See CAD Files tab below to request images.
Function
Function image

Technical specifications

  • Modifiers
    Ports
    • C, C/S
      All Ports: 1/2" NPTF;
    • D, D/S
      All Ports: 3/4" NPTF;
    • K, K/S
      All Ports: SAE 10;
    • L, L/S
      All Ports: SAE 12;
    • V, V/S
      All Ports: 1/2" BSPP;
    • W, W/S
      All Ports: 3/4" BSPP;
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    This assembly allows the smooth unloading of a low-pressure / high-flow pump in a 2 pump high-low system. This type of system utilizes the flow of 2 pumps to provide rapid speed to an actuator. Once resistance is encountered, and the requirement switches from high speed to high force / torque, then the low-pressure / high-flow pump is unloaded back to tank at minimum pressure and all the available horsepower is directed to the high-pressure / low-flow pump. This assembly also provides a system relief valve.

    • The counterbalance valve in this assembly is not acting as a counterbalance valve; it is acting as a pressure sensitive unloading valve. The setting, however, relates to the counterbalance world. With the CB*A set at 4000 psi (280 bar), the circuit will start to unload with about 1000 psi (70 bar) of pressure and will fully unload somewhere above 1400 psi (90 bar).
    • Turn adjustment clockwise to decrease setting of the counterbalance valve.
    • Backpressure at port 2 of the counterbalance valve adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.
    • Counterbalance valve reseat exceeds 85% of set pressure when the valve is standard set. Settings lower than the standard set pressure may result in lower reseat percentages.
    • Back pressure on the tank port (port 2) of the relief valve is directly additive to the valve setting at a 1:1 ratio.
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    • Body Type
      Line mount
    • Capacity
      30 gpm
    • Mounting Hole Diameter
      .34 in.
    • Mounting Hole Depth
      Through
    • Mounting Hole Quantity
      2

    Model CAD Files

    Click the link of the file format you want to download.

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    • 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
    • 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.
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