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Parker Standard Pilot Vented Load Control Valves
Parker’s vented load control valves are designed to operate independent of downstream pressure to prevent runaway loads under all dynamic conditions, handling pressures up to 350 bar (5000 psi) and flows up to 113 lpm (30 gpm).
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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
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
Applications:
• Load holding
• Position holding
Technical Specifications
| Pilot Pressure Ratio | 1/1, 3/1, 4.5/1, 4/1, 5/1, 6/1, 7/1, 8/1, 10/1, 15/1 |
| Adjustment Mechanism | N/A, Screw, Shimmed (non-adjustable), Standard (adjustable), Tamper Resistant |
| Mounting Type | Double Gasket, Double Inline, Single Gasket, Single Inline, Threaded Cartridge Valve |
| Holding Pressure | 500, 1000, 1500, 2000, 2500, 3000, 3120, 3500, 5000 psi, 34.5, 69, 105, 140, 170, 210, 215, 240, 350 bar |
| Pressure Control Range | N/A, 250-500, 500-1500, 725-5000, 725-6000, 1450-5000, 1500-3000 psi, N/A, 17.2-34.5, 34.5-103.4, 50-350, 50-420, 100-350, 105-210 bar |
| Seal Material | Nitrile, Fluorocarbon |
| Flow Rate | 5.3, 10, 15, 15.9, 25, 30, 48 Gal/min, 20, 37.5, 46.25, 60, 93.75, 112.5, 180 L/min |
| Maximum Inlet Pressure Rating | 3000, 5000, 6000 psi, 210, 350, 420 bar |
| Pressure Control Sensitivity | N/A, 725 per turn, 1220 per turn, 1335 per turn, 1650 per turn psi, N/A, 50 per turn, 84 per turn, 92 per turn, 114 per turn bar |
| Pilot Location | External, Internal |
| Body Material | N/A, Aluminum |
| Leak Rate | 5 @ 80% of setting, 6 @ 1450 PSI (100 BAR) drops/min |
| Cavity Size | N/A, 53-1, 68-1, 3C, CDD-1010, CDD-1036 |
| Installation Torque | N/A, 30, 54, 68-75, 85, 102-108 Nm, N/A, 22, 40, 50-55, 63, 75-80 lb-ft |
| 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, -15 to +400 °F, -34 to +121, -26 to +204 °C |
| Weight | 0.18, 0.73, 0.88, 1, 1.17, 1.5, 2.5, 3, 4.5 lb, 0.08, 0.33, 0.38, 0.44, 0.53, 0.68, 1.13, 1.36, 2.05 kg |
