EDG-01V-C-PNT09-51 | YUKEN Proportional Relief Valve 24.5MPa 2L/min

Product Overview

The EDG-01V-C-PNT09-51 is a classic model in the YUKEN EDG series of electro-hydraulic proportional pilot relief valves. This valve consists of a small DC solenoid combined with a direct-acting relief valve, and can be used as a pilot valve for small-flow hydraulic systems or proportional electro-hydraulic control valves, controlling pressure proportionally to the input current. The valve must be used with a dedicated power amplifier.

The EDG series is typically used as a remote pilot valve for main relief valves (e.g., EBG series) , enabling continuous stepless adjustment of system pressure via amplifier output current—widely applied in injection molding machines and hydraulic presses.

Model Code Breakdown (EDG-01V-C-PNT09-51):

• ED: Electro-hydraulic proportional pilot relief valve

• G: Subplate mounting

• 01: Valve size 01 (CETOP 03 mounting / NG6)

• V: Remote control用途 (for vent control of relief valve)

• C: Pressure adjustment range 1.0–15.7 MPa

• PN: P-port without fixed orifice (standard)

• T09: T-port orifice specification

• 51: Design number

Technical Specifications 

• Model: EDG-01V-C-PNT09-51

• Brand: YUKEN

• Series: EDG Series

• Product Type: Electro-Hydraulic Proportional Pilot Relief Valve

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 24.5 MPa (3550 PSI) 

• Maximum Flow: 2 L/min

• Minimum Flow: 0.3 L/min

• Pressure Adjustment Range: 1.0–15.7 MPa

• Hysteresis: ≤3%

• Repeatability: ≤±1%

• Coil Resistance: 10 Ω

• Rated Current: 900 mA

• Coil Voltage: DC24V

• Control Signal: 0–10V / 4–20mA (requires proportional amplifier)

• Weight: 2 kg

Key Technical Advantages

1. Electro-Hydraulic Proportional Pilot Control — Stepless Pressure Adjustment

The EDG-01V-C-PNT09-51 controls pressure continuously and proportionally to the input current, enabling stepless pressure regulation. As a remote pilot valve for main relief valves, it replaces traditional manual pressure adjustment valves with remote electric pressure control.

2. High Precision with Low Hysteresis

With hysteresis ≤3% and repeatability ≤±1%, this valve ensures high precision and stability in pressure control, meeting the stringent repeatability requirements of injection molding machines and hydraulic presses.

3. Compact 01 Size Design

The EDG-01V features CETOP 03 (NG6) subplate mounting with a compact valve body (weight only 2 kg), suitable for installation in space-constrained hydraulic manifolds.

4. Integrated Safety Valve Option

The “-1” in the model code indicates built-in safety valve (overload protection) . The “PNT09-51” configuration is standard without safety valve, allowing flexible integration as a pilot valve in various hydraulic circuits.

5. Wide Fluid and Temperature Compatibility

Operating temperature range: -15°C to +70°C, recommended fluid viscosity: 20–200 mm²/s, suitable for diverse industrial hydraulic system conditions.

6. Complete YUKEN Proportional Control System Integration

The EDG series integrates with YUKEN EBG series main relief valves and AMN / AME series proportional amplifiers to form a complete electro-hydraulic proportional pressure control system, offering high system integration and compatibility.

Application Areas

• Injection Molding Machinery — Remote proportional regulation and precise control of system pressure

• Hydraulic Presses and Forging Equipment — Stepless adjustment of working pressure

• Small Hydraulic Power Units — Pilot pressure control and system pressure regulation

• Hydraulic Fixture Systems — Precise proportional control of clamping force

• Servo Unit Pilot Pressure Control — Providing precise pilot pressure for servo systems

• Remote Pilot Valve for EBG Series Main Relief Valves — Building complete electro-hydraulic proportional pressure control systems

Expert Maintenance Tips

1. Installation Guidelines

• EDG-01V is subplate mounting. Mounting surface must conform to CETOP 03 (NG6) standard.

• Dedicated subplate EDGM-01-10 must be used.

• Valve body should be installed horizontally with solenoid facing upward.

2. Hydraulic Circuit Connections

• P port → Connect to the remote control port of the main relief valve (e.g., EBG series)

• T port → Directly return to tank

• T return line resistance should be minimized—do not install throttle valves or check valves to prevent back pressure causing unstable pressure regulation or pressure drift.

3. Electrical Requirements

• A proportional power amplifier is mandatory! PLC direct voltage output cannot drive the solenoid—the current must be amplified by a proportional amplifier.

• Standard amplifier models: AMN-W-10, etc..

• Input signals: 0–10V / 4–20mA.

• Wiring: Proportional solenoid requires DC24V—AC220V is strictly prohibited.

• PNT11 connector is DIN standard proportional valve connector—observe correct polarity.

4. Hydraulic Fluid Cleanliness

• Recommended cleanliness: NAS Class 8 or better.

• The pilot spool has extremely tight clearances and is highly susceptible to sticking—fluid cleanliness is critical.

• Use only standard O-rings for sealing—do not apply excessive sealant to prevent contamination from entering the valve.

5. Pressure Setting and Adjustment

• The valve features a manual emergency pressure adjustment screw—can be used to temporarily set maximum pressure when de-energized.

• Turn clockwise to increase pressure; lock the nut securely after adjustment.

• The built-in safety valve (models with code 1) provides system overload protection—factory preset, do not adjust arbitrarily.

6. Periodic Maintenance and Troubleshooting

• If pressure cannot be increased: Check amplifier output, wiring polarity, and T-port return line blockage.

• If pressure fluctuation or hunting occurs: First check fluid cleanliness and T return line condition.