Parker Standard Pilot Assisted Load Control Valves (E2A020TN)

Part Number
E2A020TN

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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.

Markets:
• Aerial
• Construction Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Mobile

Features/Benefits:
• 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

Applications:
• Load holding
• Position holding

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 taked with proportional and closed center systems.
Technical Specification
Pressure Control Range 725-6000 PSI, 50-420 BAR, 725-6000 psi, 50-420 bar
Maximum Flow Rate 3.7 GAL/MIN, 14 L/MIN, 3.7 Gal/min, 14 L/min
Port Size N/A, N/A
Pilot Pressure Ratio 8:1, 8:01, 8:1
Mounting Type Threaded Cartridge Valve, Threaded Cartridge Valve
Seal Material Nitrile, Nitrile
Adjustment Mechanism Tamper Resistant, Tamper Resistant
Holding Pressure 3120 PSI, 215 BAR, 3120 psi, 215 bar
Division Mobile Systems Division Europe
Pressure Control Sensitivity 113 per turn bar, 1640 per turn psi
Maximum Operating Temperature +121 °C, +250 °F
Cavity Size 53-1
Flow Rate 3.7 Gal/min, 14 L/min
Installation Torque 30 Nm, 22 lb-ft
Maximum Inlet Pressure Rating 420 bar, 6000 psi
Body Material N/A
Operating Temperature -34° to +121° °C, -34 to +121 °C, -30 to +250 °F, -30° to +250° °F
Filter Efficiency Rating ISO 4406 18/16/13, SAE Class 4, ISO 4406:1999 Code 18/16/13
For Fluid Type Mineral-based or synthetic hydraulic fluids
Minimum Operating Temperature -34 °C, -30 °F
Weight 0.17 lb, 0.08 kg
Pilot Location External
Leak Rate 6 @ 1450 PSI (100 BAR) drops/min
Flow Direction Cylinder port 1, Valve port 2, Pilot port 3
Valve Material All parts steel. All operating parts hardened steel
Maximum Operating Pressure 6000 psi, 420 bar
Port Thread Size N/A
Function Counterbalance Valve
Actuation Type Pilot Operated
Maximum Kinematic Viscosity 45-2000 SSU (6 to 420 cSt), Mineral-based or synthetic with lubricating properties at viscosities of 45-2000 SSU (6 to 420 cSt) cSt