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Model

YRIALANAR

   
   
Control
Adjustment Range
Seal Material
Primary Cartridge
Port and Material Designation
Model: YRIA

Two pump high-low unloading assembly

Capacity:

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Model

YRIALANAR

   
   
Control
Adjustment Range
Seal Material
Primary Cartridge
Port and Material Designation
Function
Function image

Technical specifications

  • Modifiers
    Ports
    • 6, 6/S
      HI, LO & T: 1 1/2" Code 62 ; GH & GL: 1/4" NPTF; Mtg Holes: .375 - 16UNC x .75 DP;
    • 6/M, 6/T
      HI, LO & T: 1 1/2" Code 62 ; GH & GL: 1/4" BSPP; Mtg Holes: M10 x 1.75-6H x .75 DP;
    • R, R/S
      HI, LO & T: 1 1/2 in. Code 61; GH & GL: 1/4" NPTF; Mtg Holes: .375 - 16UNC x .75 DP;
    • R/M, R/T
      HI, LO & T: 1 1/2 in. Code 61; GH & GL: 1/4" BSPP; Mtg Holes: M10 x 1.75-6H x .75 DP;

    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.
    • Body Type
      Line mount
    • Capacity
      120 gpm
    • Mounting Hole Quantity
      4
    • 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?
    • 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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