Product Overview
The DTDF series is part of Sun Hydraulics’ 740 Series — a 2-way, direct-acting, solenoid-operated directional blocking poppet valve. The product line accommodates standard threaded cartridge cavities (T-13A / T-11A) and offers direct interchangeability with genuine Sun Hydraulic valves. Every unit undergoes 100% factory testing to ensure consistent and reliable quality.
Models covered in this listing:
DTDF-MHN Series (T-13A Cavity, 740 Series Standard)
DTDF-MHN-224 (Normally Closed, DC24V)
DTDF-MHN-224D (Normally Closed, DC24V, with D-type manual override)
DTDF-MHN-211 / 212 / 214 / 223 / 228, and other configurations
DTDF-MCN Series (T-11A Cavity, Pilot-to-Open)
DTDF-MCN-224 (Normally Closed, DC24V, pilot-to-open check valve)
DTDF-MCN-224D (Normally Closed, DC24V, with D-type manual override)
DTDF-MCN-211 / 212 / 214 / 223 / 228, and other configurations
Technical Specifications
DTDF-MHN Series General Specifications (T-13A Cavity)
Brand Series: Sun Hydraulics 740 Series
Valve Type: 2-way, 2-position, direct-acting, solenoid-operated directional blocking poppet valve
Cavity: T-13A
Capacity: 40 L/min (10 gpm)
Maximum Operating Pressure: 350 bar (5000 psi)
Maximum Valve Leakage at 110 SUS (24 cSt) : Less than 10 drops/min @ 350 bar (0.7 cc/min @ 350 bar)
Manual Override Force Requirement: 33 N/100 bar @ Port 1
Manual Override Stroke: 2.5 mm
Response Time – Typical: 50 ms
Switching Frequency: 15,000 max. cycles/hr
Armature Diameter: 16 mm
Valve Hex Size: 22.2 mm
Valve Installation Torque: 41 – 47 Nm
Valve Weight: 0.52 kg
Seal Kit – Cartridge Buna: 990413007
Seal Kit – Cartridge Viton: 990413006
Seal Kit – Cartridge Polyurethane: 990413002
Standard Plating: Zinc-Nickel, 1000-hour salt fog protection
Coil Connector Rating: Up to IP69K
DTDF-MCN Series General Specifications (T-11A Cavity)
Brand Series: Sun Hydraulics
Valve Type: 2-way, pilot-to-open check valve with sealed pilot
Cavity: T-11A
Capacity: 60 L/min (15 gpm)
Maximum Operating Pressure: 350 bar (5000 psi)
Pilot Ratio: 3:1
Control: Normally Closed Solenoid, DC24V
Standard Plating: Zinc-Nickel, 1000-hour salt fog protection
Coil Connector Rating: Up to IP69K
Valve Installation Torque: Refer to specific cavity requirements
Key Technical Advantages
1. Direct-Acting Poppet Design — Ultra-Low Leakage
The poppet-style construction delivers extremely low internal leakage — less than 10 drops/min @ 350 bar (0.7 cc/min @ 350 bar). This makes the valve ideal for load holding and high-pressure blocking applications where zero-leakage performance is critical.
2. No Minimum Hydraulic Pressure Required
The direct-acting design means the spool is actuated directly by the solenoid, requiring no minimum system pressure for operation. This ensures reliable performance even in zero-pressure or low-pressure start-up conditions.
3. Sun Floating Style Construction — Binding Resistance
Incorporates Sun’s patented floating style construction, allowing the cartridge internals to float freely within the cavity. This minimizes the possibility of internal parts binding due to excessive installation torque or cavity/cartridge machining variations.
4. Zinc-Nickel Plating — 1000-Hour Salt Fog Protection
All configurations include zinc-nickel plating as standard, providing 1000-hour salt fog protection. This corrosion resistance far exceeds conventional industrial coatings, ensuring long-term reliability in harsh, high-humidity, and salt-spray environments.
5. Wet Armature Design — High Efficiency, Low Power Consumption
The wet armature design means working fluid surrounds the armature, providing both cooling and lubrication. The solenoid’s unique magnetic design delivers high spool actuating force per watt expended, ensuring reliable valve shifting under demanding conditions.
6. 100% Factory Tested — Guaranteed Quality
Every valve undergoes 100% inspection on automated test equipment, ensuring performance parameters meet Sun Hydraulics original specifications. The product offers direct interchangeability with genuine Sun valves.
Application Areas
Mobile & Construction Equipment — Load holding and hydraulic cylinder locking circuits
Industrial Hydraulic Power Units — High-pressure flow blocking and control
Injection Molding Machines — Clamping and ejection circuit directional control
Die Casting Machines — High-pressure hydraulic circuit blocking and switching
Wind Power Equipment — Pitch control and braking hydraulic systems
Tire Machinery — Curing press hydraulic control
Aerospace Ground Support Equipment — High-reliability hydraulic on/off control
Expert Maintenance Tips
1. Precise Installation Torque Control
Valve installation torque must be strictly controlled within 41 – 47 Nm. Use a calibrated torque wrench to tighten to specification — insufficient torque may cause leakage, while excessive torque may deform the valve body or cause internal parts binding.
2. Cavity Cleanliness
Thoroughly clean the T-13A / T-11A cavity before installation, removing all metal chips and contaminants. Use dedicated cavity cleaning tools. Cavity machining must conform to Sun original drawing specifications to ensure proper floating style function.
3. Seal Selection Verification
The DTDF series offers three seal kit options: Buna (990413007), Viton (990413006), and Polyurethane (990413002). Cartridges configured with EPDM seals are for use in phosphate ester fluid systems only — exposure to petroleum-based fluids, greases, and lubricants will damage the seals. Select the correct seal material based on your system hydraulic fluid.
4. Coil Voltage Verification
Always confirm coil voltage matches system power supply before installation. DTDF series coils are available in multiple voltage options (DC12V, DC24V, AC110V, AC220V, etc.), with or without surge protection. Voltage mismatch will result in insufficient solenoid force or coil burnout.
5. Long-Term Energization Considerations
This valve utilizes a wet armature design where working fluid surrounds the armature and is exposed to heat generated by the coil. If the coil is energized for extended periods, some fluids — notably water/glycol mixtures — may break down at elevated temperatures and form varnishes that affect cartridge function. Select appropriate hydraulic fluid and perform regular inspections for long-term energization applications.
6. Manual Override Usage
On models equipped with D or L control, the detent mechanism in the manual override is intended for temporary actuation only. The D, L, and T manual control assemblies have a mechanical life expectancy of approximately 7,000 cycles. Do not use as a permanent actuation method.
