Single Pilot Operated, Pilot to Open Check Valves | Product Series

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Single Pilot Operated, Pilot to Open Check Valves

Single Pilot Operated, Pilot to Open Check Valves

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Parker’s P.O. check valve assemblies allow flow up to 150 lpm (40 gpm) with pressures up to 420 bar (6,000 psi). Return flow can be enable by an external pilot supply, which shifts the internal poppet into an open position.

Technical Specifications

  • Maximum Flow Rate: 5, 8, 16, 20, 40 Gal/min, 19, 30, 60, 75, 150 L/min
  • Cracking Pressure: 15, 20, 25, 30, 31, 43.5, 50, 72, 85 psi, 1, 1.4, 1.7, 2, 2.1, 3, 3.5, 5, 5.9 bar
  • Seal Material: D-Ring (Standard), Nitrile, Fluorocarbon
  • Actuation Type: Pilot Operated
  • Flow Rate: N/A, 4.2 @ 100 psi (7 BAR), 8.5 @ 100 PSI (7 BAR), 21 @ 100 PSI (7 BAR), Nominal Gal/min, N/A, 16 @ 100 PSI (7 BAR), 32 @ 100 PSI (7 BAR), 80 @ 100 PSI (7 BAR), Nominal L/min
  • Maximum Operating Pressure: 3000, 5000, 6000 psi, 207, 350, 420 bar
  • Maximum Inlet Pressure Rating: 3000, 5000, 6000 psi, 207, 350, 420 bar
  • Leak Rate: 2 @ 5000 PSI (350 BAR), 3 @ 6000 PSI (420 BAR), 5 @ 3000 PSI (207 BAR), 5 @ 5000 PSI (350 BAR) drops/min
  • Cavity Size: C08-3, C10-3, C12-3, 3C, 53-1, 68-1
  • Function: Single Pilot to Open Check
  • Flow Direction: 2 - 1 Free Flow, 2-3 Free Flow
  • Pilot Pressure Ratio: 3:1, 4:1
  • Pilot Location: 1, 3
  • For Fluid Type: Mineral-based or synthetic hydraulic fluids
  • Maximum Kinematic Viscosity: 45-2000 SSU (6 to 420 cSt)
  • Filter Efficiency Rating: ISO 4406 18/16/13, SAE Class 4
  • Valve Material: All parts steel. All operating parts hardened steel
  • Installation Torque: 23, 30, 40, 48, 56, 63 lb-ft, 31, 40, 54, 65, 76, 85 Nm
  • Operating Temperature: -35 to +200, -30 to +250, -15 to +400 °F, -37 to +93, -34 to +121, -26 to +204 °C
  • Maximum Operating Temperature: +200, +250, +400 °F, +93, +121, +204 °C
  • Minimum Operating Temperature: -35, -30, -15 °F, -37, -34, -26 °C
  • Weight: 0.11 to 0.53 lbs, 0.05 to 0.24 kg
  • Body Material: N/A
Safety Warning

Full Product Description

Parker’s reliable pilot piston style P.O. check valves are designed for critical applications where safety and load holding is required and flows from 19 to 150 lpm (5 to 40 gpm) and pressures up to 420 bar (6,000 psi) are needed. These valves are available with pilot supply to either the 1st port or 3rd port depending on circuit need, and are generally used in conjunction with linear actuators across several markets within mobile or industrial hydraulics, such as aerials, material handling, and construction where durable and low leak valves are necessary to keep the machinery and operators safe.

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

Features/Benefits:
• Spherical poppet for low leakage
• Hardened precision ground parts for durability
• “D”-Ring design eliminates back-up rings
• Optional sealed pilot piston

Applications:
• Load holding without fine metering

Additional Technical Insight:
Pilot operated check valves, also known as P.O. checks, are used to lock a cylinder in a holding position with minimal leakage or drift. P.O. check valves that can be opened to allow flow in the reverse direction with an external signal to the pilot port. The valves work best when used in conjunction with a control valve that vents the valve ports to tank when centered. Pilot pressure to open the checks for reverse flow is a ratio of the holding pressure, and are typically 3:1 or 4:1. A 3:1 ratio with a 3000psi load requires a 1000psi signal to the pilot port.

Related Documents

Literature and Reference Materials
HVS Global Cartridge Valve Catalog MSG15-3504
Check Valve Technical Tips
Check Valve Technical Tips
MSG15-3504 Check Valve Catalog Pages - All
Selector Guides
Competitive Crossover Tool
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Products Maximum Flow Rate Cracking Pressure Seal Material
CP084P 5 GAL/MIN, 19 L/MIN 25 PSI, 1.7 BAR Nitrile
CP084PV 5 GAL/MIN, 19 L/MIN 25 PSI, 1.7 BAR Fluorocarbon
CP084P85 5 GAL/MIN, 19 L/MIN 85 PSI, 5.9 BAR Nitrile
CP084P85V 5 GAL/MIN, 19 L/MIN 85 PSI, 5.9 BAR Fluorocarbon
CPH104P15 8 GAL/MIN, 30 L/MIN 15 PSI, 1 BAR D-Ring (Standard)
CPH104P15N 8 GAL/MIN, 30 L/MIN 15 PSI, 1 BAR Nitrile
CPH104P15V 8 GAL/MIN, 30 L/MIN 15 PSI, 1 BAR Fluorocarbon
CPH104P 8 GAL/MIN, 30 L/MIN 20 PSI, 1.4 BAR D-Ring (Standard)
CPH104PN 8 GAL/MIN, 30 L/MIN 20 PSI, 1.4 BAR Nitrile
CPH104PV 8 GAL/MIN, 30 L/MIN 20 PSI, 1.4 BAR Fluorocarbon
CPH104P50 8 GAL/MIN, 30 L/MIN 50 PSI, 3.5 BAR D-Ring (Standard)
CPH104P50N 8 GAL/MIN, 30 L/MIN 50 PSI, 3.5 BAR Nitrile
CPH104P50V 8 GAL/MIN, 30 L/MIN 50 PSI, 3.5 BAR Fluorocarbon
CPH124P 20 GAL/MIN, 75 L/MIN 25 PSI, 1.7 BAR Nitrile
CPH124PV 20 GAL/MIN, 75 L/MIN 25 PSI, 1.7 BAR Fluorocarbon
D4A020N 8 GAL/MIN, 30 L/MIN 72 PSI, 5 BAR Nitrile
D4A020V 8 GAL/MIN, 30 L/MIN 72 PSI, 5 BAR Fluorocarbon
D4A040N 16 GAL/MIN, 60 L/MIN 43.5 PSI, 3 BAR Nitrile
D4A040V 16 GAL/MIN, 60 L/MIN 43.5 PSI, 3 BAR Fluorocarbon
D3B125V 40 GAL/MIN, 150 L/MIN 30 PSI, 2 BAR Fluorocarbon
D3B125NMK2 40 GAL/MIN, 150 L/MIN 30 PSI, 2 BAR Nitrile

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