Product Overview
The DSV-G02-2N-DC24-20, DSV-G02-3C4-DC24-20, DSV-G03-6C-DC24-82, and DSV-G03-8BL-A220-20 are DSV series wet-type solenoid operated directional control valves from Taiwan-based 7OCEAN (SEVEN OCEAN HYDRAULICS). Established in 1989, Seven Ocean Hydraulics has over 30 years of experience in hydraulic valve manufacturing, with products widely used in injection molding machines, die-casting machines, construction machinery, machine tools, and various industrial and mobile hydraulic systems.
DSV-G02 Series (6 Size / NG6 / CETOP-3):
The DSV-G02-2N-DC24-20 and DSV-G02-3C4-DC24-20 belong to the DSV-G02 series—G02 size corresponds to NG6 / CETOP-3 / NFPA-D03 mounting standards. This series delivers a maximum operating pressure of 350 bar (5000 PSI) and a maximum flow rate of 110 L/min (29 GPM) . The valve body is constructed from high-strength iron castings with wide internal passages to minimize pressure drop. The DSV series features conduit terminal box connection (G1/2 thread with standard indicating lights).
The key differences between the two models lie in the spool configuration:
DSV-G02-2N-DC24-20: 4-way, 2-position with detent (no-spring) configuration. The 2N spool features P port blocked, A/B/T ports interconnected in neutral. The detent mechanism locks the spool in position even after de-energization.
DSV-G02-3C4-DC24-20: 4-way, 3-position with spring centered configuration. The 3C4 spool returns to neutral by spring force when de-energized, with all ports blocked in neutral.
DSV-G03 Series (10 Size / NG10 / CETOP-5):
The DSV-G03-6C-DC24-82 and DSV-G03-8BL-A220-20 belong to the DSV-G03 series—G03 size corresponds to NG10 / CETOP-5 / NFPA-D05 mounting standards. This series delivers a maximum operating pressure of 320 bar (4500 PSI) and a maximum flow rate of 160 L/min (42 GPM) . The five-chamber valve body design withstands high pressure and high back pressure.
Key differences:
DSV-G03-6C-DC24-82: 4-way, 3-position with spring centered configuration. 6C spool features P port blocked, A & B ports open to T in neutral. 82 is the design/configuration code.
DSV-G03-8BL-A220-20: 4-way, 3-position with spring centered configuration. 8BL spool type, A220 indicates AC220V supply, 20 is the design code.
Both series feature wet-armature solenoid design—internal moving parts operate submerged in hydraulic fluid, providing a cushioning effect that ensures smooth, quiet operation even under high-pressure, high-frequency switching conditions. The products have passed 10 million cycle endurance testing for proven reliability.
As original 7OCEAN solenoid directional valves, these products offer complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts.
Technical Specifications
DSV-G02 Series (G02 / NG6 / CETOP-3) Common Specifications:
Brand: 7OCEAN / SEVEN OCEAN HYDRAULICS
Series: DSV-G02 Series
Mounting Standard: NG6 / CETOP-3 / NFPA-D03
Interface Type: ISO 4401-03
Maximum Operating Pressure: 350 bar (5000 PSI)
Maximum Flow Rate: 110 L/min (29 GPM)
Maximum Allowable Back Pressure: 220 bar (3190 PSI)
Spool Position: 2-Position (Single Solenoid) or 3-Position (Double Solenoid)
Spool Return Type: Spring Centered / Spring Offset / Detent
Spool Styles: 12 types available
Protection Class: IP65
Solenoid Power Source: AC100/110/120/220/240V; DC12/24V
Solenoid Type: Wet Armature (Oil-Immersed)
Electrical Connection: Conduit Terminal Box (G1/2 thread with indicating lights)
Endurance Test: 10 million cycles
Body Material: High-strength iron castings
DSV-G03 Series (G03 / NG10 / CETOP-5) Common Specifications:
Brand: 7OCEAN / SEVEN OCEAN HYDRAULICS
Series: DSV-G03 Series
Mounting Standard: NG10 / CETOP-5 / NFPA-D05
Interface Type: ISO 4401-05
Maximum Operating Pressure: 320 bar (4500 PSI)
Maximum Flow Rate: 160 L/min (42 GPM)
Maximum Allowable Back Pressure: 160 bar (2285 PSI)
Spool Position: 2-Position (Single Solenoid) or 3-Position (Double Solenoid)
Spool Return Type: Spring Centered / Spring Offset / Detent
Spool Styles: 12 types available
Protection Class: IP65
Solenoid Power Source: AC100/110/120/220/240V; DC12/24V
Solenoid Type: Wet Armature (Oil-Immersed)
Electrical Connection: Conduit Terminal Box (G1/2 thread with indicating lights)
Endurance Test: 10 million cycles
Body Material: High-strength iron castings
DSV-G02-2N-DC24-20 Specifications:
Model: DSV-G02-2N-DC24-20
Spool Configuration: 4-way, 2-position
Spring Arrangement: Detent (No-Spring)
Spool Type: 2N (P blocked, A/B/T open in neutral)
Coil Voltage: DC24V
Electrical Connection: Conduit Terminal Box
Design Code: 20
Weight: Approx. 1.7–2.0 kg
DSV-G02-3C4-DC24-20 Specifications:
Model: DSV-G02-3C4-DC24-20
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Spool Type: 3C4 (all ports blocked in neutral)
Coil Voltage: DC24V
Electrical Connection: Conduit Terminal Box
Design Code: 20
Weight: Approx. 1.7–2.0 kg
DSV-G03-6C-DC24-82 Specifications:
Model: DSV-G03-6C-DC24-82
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Spool Type: 6C (P blocked, A & B to T in neutral)
Coil Voltage: DC24V
Electrical Connection: Conduit Terminal Box
Design Code: 82
Weight: Approx. 4.4 kg
DSV-G03-8BL-A220-20 Specifications:
Model: DSV-G03-8BL-A220-20
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Spool Type: 8BL
Coil Voltage: AC220V (50/60Hz)
Electrical Connection: Conduit Terminal Box
Design Code: 20
Weight: Approx. 4.4 kg
Key Technical Advantages
1. Wet-Armature Solenoid Design for Quiet, Long-Life Operation
The DSV/DSD series features wet-armature solenoid design—internal moving parts operate fully submerged in hydraulic fluid. This design provides a cushioning effect that ensures smooth, quiet operation even under high-pressure, high-frequency switching, while effectively extending solenoid service life. Solenoids are covered with BMC fireproof material for excellent insulation. Products have passed 10 million cycle endurance testing.
2. Optimized Spool Design for Reduced Flow Forces
Optimized spool design effectively reduces flow forces generated within the valve. The five-chamber valve body design withstands high pressure and high back pressure. High-strength iron castings with wide internal passages minimize pressure drop. Compact valve body design reduces system installation space requirements.
3. Built-in Surge Suppression and Manual Override
DSV series terminal box type features built-in surge suppression. All models are equipped with manual solenoid override for emergency directional control during power failure. Standard indicating lights enable quick field status checks.
4. Multiple Voltage Options and Flexible Spool Configurations
DSV series supports multiple voltage options including AC100/110/120/220/240V and DC12/24V. Offers 12 spool styles and 6 spring return configurations. The extensive configuration options flexibly accommodate different control systems and application requirements.
5. International Standard Compliance for High Installation Compatibility
DSV-G02 series mounting conforms to NG6 / CETOP-3 / NFPA-D03 standards. DSV-G03 series mounting conforms to NG10 / CETOP-5 / NFPA-D05 standards. Fully compatible with globally adopted interfaces for direct replacement of same-series, same-specification products. IP65 protection rating effectively resists dust and water ingress.
Application Areas
DSV-G02-2N-DC24-20 (4-way, 2-position, detent):
Actuator Position Holding — Applications requiring position maintenance when de-energized
Fixture and Jig Systems — Workpiece clamping state holding control
Memory Circuits — Hydraulic systems requiring retention of last operating state
Safety Interlocks — Control circuits requiring safety state maintenance when de-energized
DSV-G02-3C4-DC24-20 (4-way, 3-position, spring centered):
CNC Machine Tools — Directional control for machine tool hydraulic systems
Injection Molding Machinery — Directional control for auxiliary functions
Industrial Automation Production Lines — Hydraulic actuator control for automated production lines
General Industrial Hydraulic Systems — Standard 4-way, 3-position directional control
DSV-G03-6C-DC24-82 / DSV-G03-8BL-A220-20 (4-way, 3-position, spring centered, high-flow):
Injection Molding Machinery — High-flow directional control for clamping, injection, and ejection cylinders
Hydraulic Presses and Forging Equipment — High-flow directional control for presses and forming equipment
Die-Casting Machines — High-flow directional control for high-pressure casting equipment
Construction Machinery — High-flow hydraulic directional control for excavators, loaders, and mobile equipment
Steel and Mining Equipment — High-flow directional control for rolling mills and heavy-duty systems
Expert Maintenance Tips
1. Installation Guidelines
DSV-G02 series mounting must conform to NG6 / CETOP-3 / NFPA-D03 standards.
DSV-G03 series mounting must conform to NG10 / CETOP-5 / NFPA-D05 standards.
Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.
Tighten mounting bolts evenly to the specified torque to ensure proper sealing between the valve body and mounting surface.
DSV series features conduit terminal box connection (G1/2 thread)—ensure the terminal box is properly sealed during installation.
2. Hydraulic Fluid Cleanliness
Recommended fluids: ISO-standard anti-wear hydraulic oil.
Install a return line filter with minimum 25 μm filtration rating upstream of the valve.
Periodically check fluid cleanliness to prevent contaminants from entering the valve.
3. Electrical Connection Specifications
DSV-G02-2N-DC24-20 and DSV-G02-3C4-DC24-20 use DC24V supply.
DSV-G03-6C-DC24-82 uses DC24V supply.
DSV-G03-8BL-A220-20 uses AC220V (50/60Hz) supply. Verify supply voltage matches coil rated voltage before connection.
DSV series features built-in surge suppression—pay attention to indicator light connections during wiring.
Ensure the terminal box cover is properly sealed to maintain IP65 protection.
4. Operating Environment and Temperature Management
Ambient temperature range: -25°C ~ +60°C .
Fluid temperature range: -25°C ~ +90°C .
Select appropriate viscosity hydraulic fluid when operating in extreme temperature conditions.
5. Detent Usage Notes (DSV-G02-2N-DC24-20)
The 2N detent (no-spring) valve locks the spool in position after solenoid actuation, maintaining the position even when de-energized.
To reset, the opposing solenoid must be energized or the detent must be manually released.
Exercise caution during manual override operation—be aware of the detent lock state to ensure safe operation.
6. Periodic Maintenance Inspection
Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.
Check terminal boxes for looseness, oxidation, or moisture ingress.
Wet-armature solenoid coils can be replaced without disturbing hydraulic connections.
If response lag or unstable shifting is observed, first check system fluid cleanliness and verify the spool is not sticking.
Periodically test the manual override function to ensure emergency availability.
