c
2025 Sun Hydraulics 1 of 4
MODEL
DNDFDNDF
4-way, 2-position, solenoid-operated directional spool valve (740
Series)
SERIESSERIES 1 / 1 / CAPACITY:CAPACITY: 40 L/min. / 40 L/min. / CAVITY:CAVITY: T-31A T-31A
X-Control, C-Spool X-Control, E-Spool
X-Control, N-Spool X-Control, T-Spool
D-Control, C-Spool D-Control, E-Spool
D-Control, N-Spool D-Control, T-Spool
L-Control, C-Spool
L-Control, E-Spool
L-Control, N-Spool L-Control, T-Spool
M or S-Control, C-
Spool
M or S-Control, E-
Spool
M or S-Control, N-
Spool
M or S-Control, T-
Spool
T-Control, C-Spool T-Control, E-Spool
T-Control, N-Spool T-Control, T-Spool
NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.
This solenoid-operated 4-way, 2-position cartridge is a direct-acting, balanced spool
directional valve.
TECHNICAL DATATECHNICAL DATA
Cavity T-31A
Series 1
Capacity 40 L/min.
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 160 cc/min.@210 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
Solenoid Tube Diameter 16 mm
Valve Hex Size 22,2 mm
Coil Nut Torque 4,8 - 5,3 Nm
Valve Installation Torque 41 - 47 Nm
Seal kit - Cartridge Buna: 990431007
Seal kit - Cartridge Viton: 990431006
Seal and nut kit - Coil Viton: 990740006
Model Weight 0.27 kg.
sunhydraulics.com/model/
DNDF
c
2025 Sun Hydraulics 2 of 4
(X)(X)CONTROLCONTROL
XX No Manual Override
DD Twist/Lock (Dual) Manual
Override
LL Twist/Lock (Detent) Manual
Override
MM Manual Override
TT Lever (Momentary) Manual
Override
(C)(C)SPOOL CONFIGURATIONSPOOL CONFIGURATION
CC Closed, Shift to Through
EE Cross, Shift to Closed
NN Through, Shift to Cross
TT Tandem, Shift to Through
(N)(N)SEAL MATERIALSEAL MATERIAL
NN Buna-N
VV Viton
COIL *COIL *
No coil
* Additional coil options are available
TECHNICAL FEATURESTECHNICAL FEATURES
The solenoid tube assembly is fatigue rated for 5000 psi (350 bar) service.
This valve is direct actuated and requires no minimum hydraulic pressure for operation.
All configurations of this valve include zinc-nickel plating as standard for 1000-hour salt fog protection.
Coil connector options offer ratings up to IP69K. See individual coil product pages for details.
On models equipped with the D or L control, the detent mechanism in the manual override is meant for temporary actuation. The D,
L and T manual control assemblies have a mechanical life expectancy of approximately 7,000 cycles.
This valve utilizes a wet armature design. This means that the working fluid surrounds the armature and is exposed to the heat
generated by the coil. This can be a factor if the coil is energized for long periods of time. Some fluids, notably water/glycol mixtures,
break down at these temperatures over time and form varnishes that will affect the function of the cartridge.
The solenoid's unique magnetic design results in a high efficiency solenoid, yielding high spool actuating force per Watt expended,
leading to reliable valve shifting.
Coils can be mounted on the tube in either direction.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation
torque and/or cavity/cartridge machining variations.
PERFORMANCE CURVESPERFORMANCE CURVES
Model Code Example: DNDFXCNModel Code Example: DNDFXCNCONFIGURATION OPTIONSCONFIGURATION OPTIONS
c
2025 Sun Hydraulics 3 of 4
c
2025 Sun Hydraulics 4 of 4
