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Standard Pilot Assisted Load Control Valves

Standard Pilot-Assisted Load Control Valves

Brand: Parker Hannifin
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Parker’s piloted load control valves are designed to operate independent of downstream pressure to prevent runaway loads under dynamic conditions using a pilot signal, handling pressures up to 420 bar (6000 psi) and flows up to 350 lpm (90 gpm).

Parker’s piloted load holding/counterbalance valves are a combination of a relief, sequence, and flow control valve that can handle pressures up to 420 bar (6000 psi) and flows up to 350 lpm (90 gpm).

These robust valves allow the operator to maintain control of the load by preventing it from overrunning the pump while also protecting against thermal expansion.

The wide selection of pilot ratios enables the valve to open based off a given backpressure specific to the application, which could be much lower than the spring pressure setting.

This feature allows predictable and consistent control of a load throughout its lowering cycle.

Additional Technical Insight

The load control valves are load assisted i.e. the pilot pressure acts on the difference between the setting and the load at the pilot ratio.

It should always be set at a minimum of 30% higher than the maximum load induced pressure to ensure the valve closes correctly.

Sizing a counterbalance valve needs care in that the flow required is usually higher than system pump flow, as in the case with a cylinder application (retract flow could be twice the system flow) though oversizing the valve could cause instability.

Because of  dynamic load variations in many applications, it may be necessary to use a lower pilot ratio or fit an orifice in the pilot line in order to gain stability.

The valve will be affected by backpressure and care must be taken with proportional and closed center systems.
Features
  • Hardened, precision ground parts for durability
  • Poppet style construction with minimal leakage
  • Tamperproof versions available
  • Single cartridge valve with integral reverse flow check valve
  • Available pilot ratios 8:1 to 1.5:1
  • All external parts zinc plated

Specifications

Brand

Adjustment Type

  • Fixed, Knob Adjustment, Screw Adjustment, Tamper Resistant, Shimmed (non-Adjustable), Standard (Adjustable), N/A

Body Material

  • N/A, Aluminum

Cavity Size

  • C10-3, CDD-1010, CDD-1036, N/A, 53-1, 68-1, 3C, 3M, 3K

Filtration Ratings

  • ISO 4406: 1999 Code 18/16/13

Holding Pressure (bar)

  • 69, 138, 210, 34.5, 105, 140, 170, 350, 103.4, 240, 17.2-34.5, 34.5-103.4, 105-210, 215

Holding Pressure (psi)

  • 1000, 2000, 3000, 500, 1500, 2500, 5000, 3500, 250-500, 500-1500, 1500-3000, 3120

Installation Torque (Lbs/Ft)

  • 16, 50-55, 75-80, N/A, 22, 40, 63, 74

Installation Torque (Nm)

  • 22, 68-75, 102-108, N/A, 30, 54, 85, 100

Leak Rate (drops/min)

  • 5 @ 80 % of Setting, 6 @ 1450 psi (100 bar)

Maximum Inlet Pressure (bar)

  • 380, 350, 210, 420

Maximum Inlet Pressure (psi)

  • 5500, 5000, 3000, 6000

Mounting Style

  • Threaded Cartridge Valve, Single Inline, Single Gasket, Double Inline, Double Gasket

Operating Temperature (°C)

  • -34° to +121° C, -26° to +204° C

Operating Temperature (°F)

  • -30° to +250° F, -15° to +400° F

Pilot Option

  • External, Internal

Pilot Pressure Ratio

  • 3:1, 4.5:1, 7:1, 1:1, 4:1, 10:1, 5:1, 6:1, 8:1, 1.75:1

Port Thread Size (inch)

  • N/A, 3/8", 1/2"

Pressure Control Sensitivity (bar)

  • N/A, 7.9 Per Turn, 10.5 Per Turn, 21.2 Per Turn, 113 Per Turn, 99 Per Turn, 44 Per Turn, 34 Per Turn, 45 Per Turn

Pressure Control Sensitivity (psi)

  • N/A, 115 Per Turn, 153 Per Turn, 307 Per Turn, 1640 Per Turn, 1435 Per Turn, 640 Per Turn, 493 Per Turn, 653 Per Turn

Pressure Range Adjustment (bar)

  • 20.7-90, 69-172.4, 166-350, N/A, 50-420, 50-350

Pressure Range Adjustment (psi)

  • 300-1300, 1000-2500, 2400-5000, N/A, 725-6000, 725-5000

Rated Flow (gpm)

  • 12, 10, 25, 15, 30, 3.7, 5.3, 15.9, 32, 53, 92

Rated Flow (Lpm)

  • 45, 37.5, 93.75, 46.25, 112.5, 14, 20, 60, 120, 200, 350

Rated Fluid Viscosity (CSt)

  • Mineral-based or Synthetic with Lubricating Properties at Viscosities of 45-2000 SSU (6 to 420 cSt)

Seal Material

  • Nitrile, Fluorocarbon

Valve Material

  • All Parts Steel. All Operating Parts Hardened Steel

Weight (kg)

  • 0.23, 0.38, 0.44, 0.68, 1.36, 1.13, 2.05, 0.08, 0.27, 0.54, 0.75, 1.44

Weight (Lbs)

  • 0.5, 0.88, 1, 1.5, 3, 2.5, 4.5, 0.17, 0.6, 1.19, 1.65, 3.17

  • Load Holding
  • Position Holding
  • Markets:
    • Aerial
    • Construction Equipment
    • Material Handling Equipment
    • Miscellaneous Industrial
    • Miscellaneous Mobile

Documentation

Literature and Reference Materials

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