Parker Standard Pilot Assisted Load Control Valves (MHC010SJNG00F)

Part Number
MHC-010-SJNG-00F

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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
Port Size N/A, N/A
Holding Pressure 2500 PSI, 170 BAR, 2500 psi, 170 bar
Pilot Pressure Ratio 10:1, 10:1
Maximum Flow Rate 10 GAL/MIN, 37.5 L/MIN, 37.5 L/min, 10 Gal/min
Seal Material Fluorocarbon, Fluorocarbon
Adjustment Mechanism Shimmed (non-adjustable), Shimmed (non-adjustable)
Mounting Type Threaded Cartridge Valve, Threaded Cartridge Valve
Pressure Control Range N/A, N/A bar, N/A psi
Division Hydraulic Cartridge Systems Division
Filter Efficiency Rating ISO 4406 18/16/13, SAE Class 4
Installation Torque 50-55 lb-ft, 68-75 Nm
Maximum Kinematic Viscosity 45-2000 SSU (6 to 420 cSt)
Maximum Operating Temperature +400 °F, +204 °C
Pressure Control Sensitivity N/A psi, N/A bar
Body Material N/A
For Fluid Type Mineral-based or synthetic hydraulic fluids
Maximum Operating Pressure 5000 psi, 350 bar
Pilot Location External
Weight 0.88 lb, 0.38 kg
Minimum Operating Temperature -15 °F, -26 °C
Actuation Type Pilot Operated
Flow Direction Cylinder port 2, Valve port 3, Pilot port 1
Flow Rate 10 Gal/min, 37.5 L/min
Cavity Size CDD-1010
Operating Temperature -15 to +400 °F, -26 to +204 °C
Maximum Inlet Pressure Rating 5000 psi, 350 bar
Function Counterbalance Valve
Leak Rate 5 @ 80% of setting drops/min
Valve Material All parts steel. All operating parts hardened steel