Overview

HV66, Manually Operated Check Valve with Built-in Relief Valve

Engineered for critical hydraulic safety in mobile and industrial machinery, the ULTPRE HV66 combines precision load-holding with adjustable speed control. This valve delivers unmatched security in crane, construction, and energy applications where uncontrolled movement risks catastrophic failure.

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Core Technology Excellence
✅ Dual-Function Safety Architecture

  • Zero-Leak Ball Lock: Precision-ground tool steel ball + nitride-hardened seat ensures <0.1 mL/min internal leakage at 70MPa.

  • Integrated Relief Valve: Adjustable blow-off pressure (20-70MPa) prevents cylinder damage during overloads.

✅ Extreme Environment Durability

  • 42CrMo QPQ-Treated Body: Nitriding + oxidation surface hardening (800HV) withstands 1,000+ hrs salt spray corrosion.

  • High-Temp Resilience: Fluorocarbon seals operate at -30°C to 150°C.

✅ Controlled Load Management

  • Speed-Regulated Lowering: Metered oil return enables precise descent rates—eliminating “runaway cylinder” risks.

  • Pilot-Actuated Release: Smooth flow path transition prevents pressure spikes during unlocking.

Performance Advantages
► Critical Safety Functions:

  • Locks loads indefinitely during pump/hose failure

  • Prevents cylinder rod burst via adjustable overpressure relief

  • Ensures controlled descent in winch/boom applications
    ► Energy Efficient: 25% lower pilot pressure vs. poppet-type designs
    ► Compact Integration: Cartridge/inline mount (ISO 7789 / SAE J1926)

Dimensions

–File NameFile Type
液压附件图册中文
Hydraulic Accessories BrochureEnglish