Standard Pilot Vented Load Control Valves | #MHC-022-VASC-00B


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MHC-022-VASC-00B MHC-022-VASC-00B MHC-022-VASC-00B MHC-022-VASC-00B

Standard Pilot Vented Load Control Valves | #MHC-022-VASC-00B OBSOLETE

Note: This product is no longer available - please refer to the “Product Support" or "Recommended products" section of this page for details on any alternative products, or contact us for further assistance.


Technical Specifications

  • Maximum Flow Rate: 25 GAL/MIN, 93.75 L/MIN
  • Pilot Pressure Ratio: 1:1
  • Adjustment Mechanism: Standard (adjustable)
  • Mounting Type: Threaded Cartridge Valve
  • Holding Pressure: 500 PSI, 34.5 BAR
  • Pressure Control Range: N/A
  • Port Size: N/A
  • Seal Material: Nitrile
  • Division: Hydraulic Systems Division
  • Maximum Flow Rate: 25 gal/min, 93.75 L/min
  • Pilot Pressure Ratio: 1:1
  • Adjustment Mechanism: Standard (adjustable)
  • Mounting Type: Threaded Cartridge Valve
  • Holding Pressure: 500 psi, 34.5 bar
  • Pressure Control Range: N/A psi, N/A bar
  • Port Size: N/A
  • Seal Material: Nitrile
  • Flow Rate: 25 gal/min, 93.75 L/min
  • Maximum Operating Pressure: 5000 psi, 350 bar
  • Maximum Inlet Pressure Rating: 5000 psi, 350 bar
  • Pressure Control Sensitivity: N/A psi, N/A bar
  • Function: Counterbalance Valve
  • Actuation Type: Pilot Operated, Vented
  • Pilot Location: External
  • Body Material: N/A
  • Flow Direction: Cylinder port 2, Valve port 3, Pilot port 1
  • Leak Rate: 5 @ 80% of setting drops/min
  • Cavity Size: CDD-1036
  • Installation Torque: 102-108 Nm, 75-80 lb-ft
  • For Fluid Type: Mineral-based or synthetic hydraulic fluids
  • Filter Efficiency Rating: ISO 4406 18/16/13, SAE Class 4
  • Maximum Kinematic Viscosity: 45-2000 SSU (6 to 420 cSt)
  • Valve Material: All parts steel. All operating parts hardened steel
  • Operating Temperature: -30 to +250 °F, -34 to +121 °C
  • Maximum Operating Temperature: +250 °F, +121 °C
  • Minimum Operating Temperature: -30 °F, -34 °C
  • Weight: 0.88 lb, 0.38 kg
Safety Warning

Item Information

Parker’s vented to atmosphere load holding/counterbalance valves are a combination of a relief, sequence, and flow control valve that can handle pressures up to 350 bar (5000 psi) and flows up to 113 lpm (30 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 at pressures much lower than the spring pressure setting, allowing consistent control of the load throughout its lowering cycle. Because these valves spring chamber are vented to atmosphere, the valve will not be affected by changes in return pressure. Parker’s vented load holding valves are ideal in closed center circuits where there is need to control pressure using an auxiliary relief valve.



Markets:

• Aerial

• Construction Equipment

• Material Handling Equipment

• Miscellaneous Industrial

• Miscellaneous Mobile



Features/Benefits:

• Vented to atmosphere, no additional drain line required

• 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 from 8:1 to 3:1

• All external parts zinc plated

 

Value Statement:

Parker MHC-Series counterbalance valves metering profile provides greater stability and smoother machine operation, resulting in less operator fatigue and improved productivity.



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.

The valve 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.

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Find a Distributor

Where to Buy

Local Contact

Hydraulic Valve Systems Division

520 Ternes Avenue

Elyria

Ohio

44036-4026

Phone

(440) 366-5100

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