DNDM-LNN – Sun Hydraulics 4-way, manually operated, directional spool valve
Part number: DNDMLNN · DNDM-LNN · DNDM LNN
4-way, manually operated, directional spool valve. Cavity T-31A, capacity 10 gpm (40 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
DNDM-LNN overview
DNDMLNN (DNDM-LNN, DNDM LNN) is a Sun Hydraulics Sun Hydraulics 4-way, manually operated, directional spool valve, rated 10 gpm (40 L/min.) and installed in cavity T-31A. MultiFlow supplies genuine Sun Hydraulics cartridges in the UAE, GCC and India — use Add to Enquiry above for availability and a quotation.
Ordering codes
Pick the code that matches the material and finish you need. Add it to your enquiry above, or tap a code to select it.
| DNDMLNN | Buna-N sealsBuna-N |
|---|---|
| DNDMLNV | Viton sealsViton |
| DNDMLNE | EPDM sealsEPDM |
Specifications
| Cavity | T-31A |
|---|---|
| Series | 1 |
| Capacity | 10 gpm (40 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 in³/min.@3000 psi (160 cc/min.@210 bar) |
| Operating Torque | 10 lbf in. (1,2 Nm) |
| Valve Hex Size | 7/8 in. (22,2 mm) |
| Valve Installation Torque | 30 - 35 lbf ft (41 - 47 Nm) |
| Seal kit - Cartridge | Viton: 990431006 |
How to read DNDMLNN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DNDMLNN, DNDM-LNN, DNDM LNN are the same part.
| Model | DNDM — Sun Hydraulics 4-way, manually operated, directional spool valve |
|---|---|
| Control | L — Twist/Lock (Detent) Manual Override |
| Spool Configuration | N — Through, Shift to Cross |
| Seal Material | N — Buna-N |
| Material / coating | Add /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish. |
Control options
- D — Twist/Lock (Dual) Manual Override
- L — Twist/Lock (Detent) Manual Override
- T — Twist (Momentary) Manual Override
Spool Configuration options
- C — Closed, Shift to Through
- D — Closed, Shift to Cross
- E — Cross, Shift to Closed
- H — Open, Shift to Cross
- N — Through, Shift to Cross
- L — Cross, Shift to P to A, B and T Blocked
- R — Regen, Shift to Cross
- T — Tandem, Shift to Through
- U — Through, Shift to Tandem
- Y — Motor, Shift to Cross
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Manifold & standard assemblies
Sun manifolds for cavity T-31A (49)
- C7A Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7A — request assembly
- C7B Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7B — request assembly
- C7C Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7C — request assembly
- C7I Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7I — request assembly
- C7J Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7J — request assembly
- C7K Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7K — request assembly
- C7T Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7T — request assembly
- C7U Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7U — request assembly
- C7V Sun Hydraulics Ninety degree Line mount manifoldDNDMLNN-C7V — request assembly
- C8A Sun Hydraulics Ninety degree, accepts standard and weatherized coils Line mount manifoldDNDMLNN-C8A — request assembly
- C8B Sun Hydraulics Ninety degree, accepts standard and weatherized coils Line mount manifoldDNDMLNN-C8B — request assembly
- C8C Sun Hydraulics Ninety degree, accepts standard and weatherized coils Line mount manifoldDNDMLNN-C8C — request assembly
Technical features
- This valve is designed for intermittent use such as a manual override. The manual control assembly has a mechanical life expectancy of approximately 7,000 cycles.
- The momentary/twist control option "T" allows the operator to momentarily shift the valve by twisting the knob clockwise and releasing. Once released, the valve returns to its normal position.
- The detent/lock control option "L" allows the operator to shift the valve into a mechanically detented position by twisting the knob counter-clockwise. This detented position will be maintained until the operator twists the knob clockwise and allows the valve to return to its normal position. Please note that the detented position is for temporary shifting only and not intended to be a permanent detent.
- The dual-operation control option "D" allows the operator to either shift the valve momentarily by twisting the knob clockwise or shift it into a mechanically detented postion by twisting counter-clockwise. Please note that the detented position is for temporary shifting only and not intended to be a permanent detent.
- The control on this valve is meant to be operated by a person's hand. The control should not be modified, for instance fastening a lever to the knob. Under no circumstances should the control be operated by other mechanical devices.
- Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
- 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.
Drawings, symbol & performance curves
Downloads
Datasheet
Technical reference sheets
CAD files
Frequently asked questions
Is DNDMLNN the same as DNDM-LNN?
Yes. Sun Hydraulics writes this part number as DNDMLNN. It is the model DNDM followed by the configuration code; hyphens, slashes and spaces are only dividers, so DNDMLNN, DNDM-LNN, DNDM LNN all refer to the same product.
Do you supply DNDMLNN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DNDMLNN, to customers in the UAE, the wider GCC and India. Use Add to Enquiry on this page for availability, lead time and a quotation.
Can I get the datasheet and CAD files?
Yes. The datasheet, technical reference sheets and CAD files (DXF, DWG, STP) are listed in the Downloads section of this page.
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.
How big is a drop of hydraulic oil?
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/DNDM
