P80 1P80 2P80 3P80 4P80 5P80 6P80 Monoblock Directional Control Valve 80 L/min 315 bar

Product Overview

The P80 Series Monoblock Directional Control Valve is a medium-to-high pressure hydraulic directional valve available in six models — 1P80, 2P80, 3P80, 4P80, 5P80, and 6P80 — corresponding to 1 through 6 spool sections. The series features a rugged monoblock (integral) valve body construction that integrates inlet, return, and directional change functions into a single compact unit, significantly saving installation space.

With a rated flow of 80 L/min and a maximum working pressure of 315 bar (4600 psi), the P80 series delivers reliable performance in demanding hydraulic applications. The valve body is precision-cast from high-grade HT300 cast iron with phosphating surface treatment, achieving 48-hour neutral salt spray corrosion resistance. The series supports multiple control options including manual, solenoid, pneumatic, electro-hydraulic, and cable control, with optional hydraulic lock functionality available on A and B ports for secure actuator holding.

Engineered as a direct drop-in replacement solution, this product strictly adheres to interchangeability standards — all mounting dimensions, port configurations, and performance parameters are fully compatible with original equipment manufacturers’ specifications, enabling seamless replacement without modifications to existing system plumbing.

Technical Specifications 

• Model Series: 1P80 / 2P80 / 3P80 / 4P80 / 5P80 / 6P80 (1 to 6 spool sections)

• Rated Flow: 80 L/min (21.2 US gpm)

• Maximum Working Pressure (P Port) : 315 bar (4600 psi)

• Rated Working Pressure: 250 bar (3626 psi)

• Neutral Position Back Pressure: ≤1 MPa

• Spool Stroke: ±6 mm

• Internal Leakage: ≤15 mL/min at 160 bar, 50°C

• Operating Viscosity Range: 15 – 75 mm²/s (15 – 75 cSt)

• Viscosity Range (Applicable) : 12 – 400 cSt

• Operating Temperature Range: -40°C to +80°C (-40°F to +176°F)

• Valve Body Construction: Monoblock (Integral)

• Valve Body Material: HT300 Cast Iron

• Surface Treatment: Phosphating

• Corrosion Resistance: 48-hour Neutral Salt Spray Test

• Spool Functions: O, Y, A, Q type

• Control Options: Manual / Solenoid / Pneumatic / Electro-hydraulic / Cable / Pilot-operated

• Port Connections: G1/2, G3/4, M27×2.0 thread, SAE 10, SAE 12, 1/2 NPT, 3/4 NPT

• Optional Features: Relief valve, overload valve, check valve, make-up valve, hydraulic lock

Key Technical Advantages

1. Monoblock Construction for Rigidity and Low Leakage

The P80 series features an integral monoblock valve body design that eliminates potential leak paths found in sectional valves. Precision-cast from high-strength HT300 cast iron, the monoblock construction provides exceptional rigidity and resistance to deformation, ensuring long-term spool-to-bore clearance stability even under high-frequency cycling conditions.

2. Multiple Control Options for Flexible Integration

Supports a comprehensive range of control methods including manual, solenoid, pneumatic, electro-hydraulic, cable, and pilot operation, allowing OEMs to select the optimal configuration for their specific application. Multiple spool center positions (O, Y, A, Q) are available to accommodate diverse hydraulic circuit requirements.

3. Integrated Multi-Function Capability

The valve body can integrate relief valves, overload valves, check valves, and make-up valves within a single compact unit. Optional hydraulic lock on A and B ports provides reliable load-holding capability, preventing unintended actuator movement. Parallel circuit design with Power Beyond option facilitates easy system expansion.

4. Designed for Harsh Operating Environments

Wide operating temperature range (-40°C to +80°C) ensures reliable performance in extreme climatic conditions. Phosphating surface treatment combined with 48-hour neutral salt spray corrosion resistance significantly enhances durability in潮湿, dusty, and corrosive environments.

5. 100% Simulated Duty Cycle Factory Testing

Every unit undergoes 100% factory testing under simulated operating conditions, including pressure integrity validation, internal leakage measurement, directional response verification, and durability assessment — ensuring consistent, reliable performance straight out of the box.

Application Areas

• Construction Equipment: Mini excavators, wheel loaders, bulldozers

• Material Handling: Forklifts, stackers, scissor lifts

• Agricultural Machinery: Tractors, combine harvesters, agricultural loaders

• Municipal & Sanitation Vehicles: Garbage compactors, street sweepers, water trucks

• Industrial Vehicles: Aerial work platforms, airport ground support equipment

• Mining Equipment: Underground utility vehicles, drilling rigs

• Crane & Tow Truck Applications: Boom control, outrigger control

Expert Maintenance Tips

1. Pre-Installation Guidelines

Before installation, verify that the system working pressure does not exceed the P80 series rated maximum (315 bar). Thoroughly flush all hydraulic lines prior to port connection and ensure system cleanliness meets at least NAS Class 9 to prevent contamination-induced spool sticking or premature wear.

2. Hydraulic Fluid Selection

Use mineral oil-based hydraulic fluids with an operating viscosity between 15 – 75 mm²/s (15 – 75 cSt) for optimal performance. Operation outside the 12 – 400 cSt viscosity range may affect directional response and sealing integrity. Maintain fluid operating temperature within -40°C to +80°C.

3. Routine Inspection & Maintenance Schedule

• Inspect fluid cleanliness and viscosity every 500 operating hours

• Regularly check all port connections for external leakage

• For solenoid-operated models, periodically verify coil insulation resistance and terminal tightness

• If slow response or increased internal leakage is observed, inspect spool wear condition promptly

4. Spare Parts Management

We recommend stocking spare spool seal kits and solenoid coils (where applicable) for the specific model in use to enable rapid replacement during unexpected failures and minimize downtime. All sections within the P80 series feature good interchangeability, simplifying spare parts inventory management.