Product Overview
The P80 Series Monoblock Directional Control Valve is a medium-to-high pressure integrated hydraulic valve engineered with advanced European technology. With a rated flow of 80 L/min (21.2 US gpm) and a maximum pressure rating of 315 bar (4600 psi), this valve series delivers precise and reliable directional control for demanding mobile and industrial hydraulic applications. The P80 is available in 1 through 6 working sections, accommodating a wide range of circuit complexity requirements within a single compact monoblock body.
Every P80 valve is a true drop-in replacement for OEM-specified units. The mounting interface, port sizes, and performance curves are dimensionally and functionally identical to the original equipment, eliminating the need for pipe modification or bracket adaptation during replacement. Each unit undergoes 100% bench testing under simulated working conditions, including rated-pressure holding tests, directional response verification, internal leakage measurement, and relief valve cracking pressure calibration, ensuring delivery of a product that performs to specification from the first day of installation.
Technical Specifications
General Specifications
Product Series: P80 (1P80 / 2P80 / 3P80 / 4P80 / 5P80 / 6P80)
Structure Type: Monoblock multi-way directional control valve
Working Sections: 1 to 6 sections (up to 7 sections on request)
Rated Flow: 80 L/min (21.2 US gpm)
Maximum Working Pressure: 315 bar (4600 psi)
Relief Valve Setting: 250 bar (standard factory setting, adjustable)
Tank Port Back Pressure: ≤ 50 bar
Control Options
Manual lever control (standard)
Solenoid pilot control (12 VDC / 24 VDC)
Pneumatic control
Electro-hydraulic proportional control
Manual + solenoid combined control
Spool Functions
O type: All ports closed in neutral
A type: Port A closed in neutral
Y type: Ports A/B connected to tank in neutral
P type: Pressure port closed in neutral
Hydraulic Parameters
Working Fluid: Mineral-based hydraulic oil
Viscosity Range: 15 – 75 mm²/s (cSt)
Fluid Temperature Range: -15°C to +80°C
Filtration: NAS 1638 Class 10 (ISO 4406 19/17/14)
Spool Stroke: ± 7 mm
Actuating Force: < 220 N (manual type)
Port Connections
Inlet (P): G1/2″ or SAE 10
Work Ports (A/B): G1/2″ or SAE 10
Tank (T): G3/4″ or SAE 12
Materials & Surface Treatment
Body Material: EN-GJL300 high-strength gray cast iron
Spool Material: Carburized steel with hard chrome plating
Surface Treatment: Phosphating / painting / dacromet coating
Weight Reference
1 section: approx. 3.9 kg
2 sections: approx. 7.9 kg
3 sections: approx. 10.5 kg
4 sections: approx. 13.0 kg
5 sections: approx. 15.5 kg
6 sections: approx. 17.9 kg
Key Technical Advantages
1. High-Strength Monoblock Body with Precision Machining
The valve body is cast from EN-GJL300 gray cast iron with a tensile strength of ≥ 300 MPa, capable of withstanding sustained alternating loads under high-pressure operation without deformation. Valve bores are finished using a precision honing process, while spools undergo grinding to achieve micron-level clearance control between spool and bore. This results in significantly reduced cross-port leakage and minimized energy waste. At a differential pressure of 120 bar, measured internal leakage from ports A/B to the tank port is only 6 cm³/min.
2. Modular Section Design for Flexible Configuration
The P80 series employs a modular monoblock architecture combining standard inlet, working, and outlet sections. Users can configure 1 to 6 working sections to match circuit complexity. Each working section incorporates an integral check valve to prevent reverse flow and an overload relief valve for actuator protection. The valve group supports both parallel and series circuit configurations, with a Power Beyond port available for supplying downstream hydraulic components. Spool functions are selectable from O, A, Y, and P types to suit diverse control requirements.
3. Advanced Sealing System with Wide Temperature Adaptability
Sealing elements are specifically engineered for high-pressure service, using imported polyurethane (PU) and nitrile rubber (NBR) composite seals that deliver leak-free performance at 315 bar working pressure. The valve operates reliably across an ambient temperature range of -40°C to +80°C, making it suitable for construction machinery operating in extreme climate conditions. The wide hydraulic oil viscosity range of 15-75 mm²/s accommodates both mineral-based and biodegradable hydraulic fluids.
4. Low Actuation Force with Precise Flow Control
Through optimized spool metering groove geometry and flow passage design, manual actuation force is maintained below 220 N while still delivering full rated flow, reducing operator fatigue during extended working cycles. The ± 7 mm spool stroke, combined with precision-machined metering windows, provides linear and accurate control of actuator speed. Solenoid-controlled versions are equipped with ISO 4400 standard coils, delivering fast response with minimal shifting shock.
5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every P80 valve undergoes 100% bench testing prior to shipment, covering rated pressure holding (315 bar / 3 min), directional response time measurement, internal leakage verification, relief valve cracking pressure calibration, and full-stroke shifting reliability validation. The mounting dimensions, port positions, and performance curves are strictly matched to original equipment specifications, enabling direct drop-in replacement of same-specification OEM valves without modifying piping or mounting interfaces.
Application Areas
Construction Machinery: Compact wheel loaders, skid steer loaders, mini excavators, telehandlers, motor graders
Material Handling Equipment: Forklifts, stackers, aerial work platforms
Sanitation Vehicles: Refuse compactors, street sweepers, water sprinkler trucks
Agricultural Machinery: Tractor hydraulic hitch systems, combine harvesters, grapple loaders
Special-Purpose Vehicles: Truck-mounted cranes, wreckers, drilling rigs
Industrial Power Units: Small-to-medium hydraulic power packs, press control systems
Expert Maintenance Tips
Installation Guidelines
The P80 valve group is mounted with 3 M8 bolts. The mounting surface flatness must be ≤ 0.05 mm. An uneven mounting surface may distort the valve body and cause spool binding.
Flush all piping circuits thoroughly before connecting. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.
Connect the inlet port (P) to the system pressure line. The tank port (T) must return independently to the reservoir, with back pressure not exceeding 50 bar.
Routine Maintenance Procedures
Fluid Cleanliness Management: Maintain system fluid cleanliness at NAS 1638 Class 10 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.
Relief Valve Pressure Verification: Every 1,000 operating hours, verify the relief valve setting using a calibrated pressure gauge. If deviation exceeds ± 5%, re-calibrate via the adjustment screw. Note: rotate clockwise to increase pressure, counterclockwise to decrease.
Seal Replacement Interval: Under normal operating conditions, replace valve group seals every 3,000-5,000 hours. For high-temperature applications (fluid temperature consistently above 60°C) or systems subject to frequent pressure spikes, reduce the interval to 2,000 hours.
Spool Movement Inspection: Periodically operate each section manually to verify smooth shifting and positive return. If actuation force increases noticeably or the spool binds, stop operation immediately and inspect fluid cleanliness and spool wear.
Solenoid Electrical Inspection: For solenoid-controlled versions, periodically check coil insulation resistance (should be ≥ 100 MΩ) and terminal tightness to prevent shifting failure caused by poor electrical contact.
