Product Overview
The EP08W2A06N04, EP13A2A31M05, EP13A2A32N05, and EP13A2A31N05 are core models in the WINNER EP series of pilot-operated poppet-type 2/2 solenoid cartridge valves. Founded in 1993, WINNER Hydraulics Corporation has become an internationally recognized manufacturer of hydraulic screw-in cartridge valves.
The EP series features pilot-operated poppet-type construction for direct manifold installation, delivering extremely low internal leakage (≤3 drops/min). Products are widely used in construction machinery, mobile vehicles, marine, wind power, offshore engineering, metallurgy, petroleum, machinery manufacturing, and rubber & plastics machinery.
Model Overview:
EP08W2A06N04: 08W-2 cavity, pilot-operated normally open . When de-energized, flow is allowed in both directions; when energized, flow from port 1 to port 2 is allowed, while flow from port 2 to port 1 is restricted. Rated flow: 40 L/min.
EP13A2A31M05: 13A-2 cavity, pilot-operated normally closed with screw-out knob manual override. When de-energized, flow is blocked in both directions; when energized, flow is allowed in both directions. Rated flow: 40 L/min.
EP13A2A32N05: 13A-2 cavity, pilot-operated normally open with push-pin manual override. When de-energized, flow is allowed in both directions; when energized, flow is blocked in both directions. Rated flow: 40 L/min.
EP13A2A31N05: 13A-2 cavity, pilot-operated normally closed with push-pin manual override. When de-energized, flow is blocked in both directions; when energized, flow is allowed in both directions. Rated flow: 40 L/min.
Model Code Breakdown (using EP13A2A31M05 as an example):
EP: Electromagnetic Cartridge Valve Series
13A: Nominal size / cavity code (13A-2 cavity)
2A: Valve type code (2-port, 20W coil, Ø12.7 mm tube)
31 / 32: Function code (31=normally closed; 32=normally open)
M / N: Manual override option (M=knob style; N=push-pin)
05: Design/configuration code
Technical Specifications
EP08W2A06N04 Specifications:
Model: EP08W2A06N04
Brand: WINNER (Taiwan)
Product Type: 2/2 Pilot-Operated Solenoid Cartridge Valve
Valve Type: Poppet Type
Normal Position: Normally Open
Cavity: 08W-2
Maximum Operating Pressure: 350 bar (5000 psi)
Rated Flow: 40 L/min (10.57 gpm)
Maximum Leakage: 0.15 cc/min (3 drops/min) at 350 bar
Valve Hex Size: 24 mm (15/16 in.)
Installation Torque: 39–51 N·m (29–38 lbf·ft)
Locknut Torque: 2–3 N·m (1.5–2 lbf·ft)
Coil Type: EC-04W
Power Consumption: 20 W
Supply Voltage: 90% of nominal
Protection Class: IP65
Salt Spray Test: >1000 hours (WINNERcoat® Zinc-Nickel Plating)
Mounting Position: Unrestricted
Weight: 0.14 kg (Z=T) / 0.13 kg (Z=N/P)
EP13A2A31M05 / EP13A2A32N05 / EP13A2A31N05 Specifications:
Model: EP13A2A31M05 / EP13A2A32N05 / EP13A2A31N05
Brand: WINNER (Taiwan)
Product Type: 2/2 Pilot-Operated Solenoid Cartridge Valve
Valve Type: Poppet Type
Normal Position: EP13A2A31M05 / EP13A2A31N05 = Normally Closed; EP13A2A32N05 = Normally Open
Cavity: 13A-2
Maximum Operating Pressure: 350 bar (5000 psi)
Rated Flow: 40 L/min (10.57 gpm)
Maximum Leakage: 0.15 cc/min (3 drops/min) at 350 bar
Valve Hex Size: 24 mm (15/16 in.)
Installation Torque: 39–51 N·m (29–38 lbf·ft)
Locknut Torque: 2–3 N·m (1.5–2 lbf·ft)
Coil Type: EC-04W
Power Consumption: 20 W
Supply Voltage: 90% of nominal
Manual Override: M05=Knob Style; N05=Push-pin
Salt Spray Test: >1000 hours (WINNERcoat® Zinc-Nickel Plating)
Mounting Position: Unrestricted
Weight: 0.14 kg
Key Technical Advantages
1. Pilot-Operated Poppet-Type Leakage-Free Design — Extremely Low Internal Leakage
The EP series features pilot-operated poppet-type spool construction, achieving metal-to-metal sealing against the seat in the closed position. Unlike spool-type valves, the poppet design delivers extremely low internal leakage in the closed state, with maximum leakage of only 3 drops/min (0.15 cc/min) . Ideal for high-pressure hydraulic systems requiring long-term actuator position holding with minimal leakage.
2. Pilot-Operated Structure — High Flow with Precise Control
Features pilot-operated construction—the main stage is controlled by the pilot stage. Compared to direct-acting designs, pilot-operated structures enable high flow control with smaller solenoid drive force. Rated flow reaches 40 L/min, suitable for diverse medium-to-high pressure hydraulic systems.
3. Wet-Type Solenoid Design for Quiet, Long-Life Operation
Features wet-armature solenoid construction—the movable iron core operates fully submerged in hydraulic oil. The hydraulic oil lubricates moving parts to reduce wear and cushions switching impact and vibration. Coils are continuous-duty rated and can be replaced without opening the hydraulic system.
4. Heat-Treated and Precision-Ground Poppet for Superior Wear Resistance
Critical control elements are heat-treated and high-precision ground, significantly increasing surface hardness and reducing wear. This ensures long-term sealing performance with extremely low internal leakage, substantially extending valve service life.
5. WINNERcoat® Zinc-Nickel Plating for Superior Corrosion Resistance
All exposed surfaces feature WINNERcoat® Zinc-Nickel Plating, with salt spray testing per DIN EN ISO 9227 exceeding 1000 hours. This excellent corrosion resistance makes it particularly suitable for offshore engineering, marine, mining, and other humid/corrosive environments.
6. International Standard Compliance with 100% Functional Testing
Winner cartridge valves are pressure-rated per NFPA T2.6.1 standards, with fatigue rating assurance/verification level of “90/90” . All products undergo 100% functional testing before shipment.
Application Areas
Injection Molding Machinery — Directional control and flow switching for injection molding machines
Construction Machinery — Hydraulic system control for excavators, loaders, and mobile equipment
Mobile Vehicles — Directional and flow control for vehicle hydraulic systems
Marine and Offshore Engineering — Shipboard hydraulic systems and offshore platform control
Wind Power Equipment — Pitch control and braking system hydraulics for wind turbines
Metallurgical Equipment — Directional control for rolling mills and heavy-duty hydraulic systems
Rubber and Plastics Machinery — Hydraulic control for rubber and plastics processing equipment
High-Pressure Hydraulic Systems — Various industrial applications requiring ultra-low leakage and high-pressure control
Expert Maintenance Tips
1. Installation Guidelines
EP08W2A06N04 fits 08W-2 cavity. EP13A2A31M05 / EP13A2A32N05 / EP13A2A31N05 fit 13A-2 cavity. Verify cavity size compatibility before installation.
Thoroughly clean the cavity and valve exterior before installation to prevent foreign particles from entering and causing seal damage or spool sticking.
Recommended installation torque: 39–51 N·m (29–38 lbf·ft) . Reduce torque for aluminum manifolds to prevent thread damage.
No orientation restrictions—any installation orientation is acceptable.
2. Hydraulic Fluid Cleanliness
Recommended filtration: 25 μm (nominal or better) .
Temperature range: -40°C to 120°C.
Use standard mineral-based or synthetic hydraulic fluids.
3. Electrical Connection Specifications
All models use 24V DC supply with power consumption of 20 W.
Minimum voltage required: 90% of nominal.
Coils are continuous-duty rated.
Coils must be ordered separately.
Ensure electrical connector is fully locked to maintain IP65 protection.
4. Seal Material Selection
5. Manual Override Usage Notes
EP13A2A31M05 features screw-out knob style manual override.
EP13A2A32N05 / EP13A2A31N05 feature push-pin manual override.
Manual operation is for emergency or test use only.
Larger force is required for downward push during high-pressure operations.
6. Periodic Maintenance Inspection
Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.
Check electrical connectors for looseness, oxidation, or moisture ingress.
If response lag or unstable shifting is observed, first check system fluid cleanliness and poppet seal condition.
The EP series poppet design features extremely low internal leakage—if abnormal leakage increase is observed, inspect the valve seat sealing surface for damage.
