4-way, 2-position, solenoid-operated directional spool valve (740 Series)

Capacity: 10 gpm40 L/min. | Cavity: T-31A
DNDF : 4-way, 2-position, solenoid-operated directional spool valve (740 Series)
Technical Features [ + ]

This solenoid-operated 4-way, 2-position cartridge is a direct-acting, balanced spool directional valve.

  • 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.
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Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
Cavity T-31A
Series 1
Capacity 10 gpm40 L/min.
Maximum Operating Pressure 5000 psi350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 10 in³/min.@3000 psi160 cc/min.@210 bar
Manual Override Force Requirement 5 lbs/1000 psi @ Port 133 N/100 bar @ Port 1
Manual Override Stroke .10 in.2,5 mm
Response Time - Typical 50 ms50 ms
Switching Frequency 15,000 max. cycles/hr15,000 max. cycles/hr
Solenoid Tube Diameter .63 in.16 mm
Valve Hex Size 7/8 in.22,2 mm
Coil Nut Torque 3.5 - 3.9 lbf ft4,8 - 5,3 Nm
Valve Installation Torque 30 - 35 lbf ft41 - 47 Nm
Model Weight .55 lb0,25 kg
Seal kit - Cartridge Buna: 990431007
Seal kit - Cartridge Viton: 990431006
Seal and nut kit - Coil Viton: 990740006
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Performance Curves [ + ]
Performance Curve for DNDF: 4-way, 2-position, solenoid-operated directional spool valve (740 Series) Performance Curve for DNDF: 4-way, 2-position, solenoid-operated directional spool valve (740 Series) Performance Curve for DNDF: 4-way, 2-position, solenoid-operated directional spool valve (740 Series) Performance Curve for DNDF: 4-way, 2-position, solenoid-operated directional spool valve (740 Series) Performance Curve for DNDF: 4-way, 2-position, solenoid-operated directional spool valve (740 Series)
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FAQs [ + ]
How big is a drop of hydraulic oil?  

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Direct acting or pilot operated - what do I use?

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

What parts of the Sun cartridge valve are field serviceable?
Only external seals are serviceable.  Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.
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Additional Resources [ + ]
Highlights
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Technical Information
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Coil Information [ + ]

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