LOFO-XDN – Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element
Part number: LOFOXDN · LOFO-XDN · LOFO XDN
Pilot-to-close, spring-biased open, unbalanced poppet logic element. Cavity T-2A, capacity 50 gpm (200 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
LOFO-XDN overview
LOFOXDN (LOFO-XDN, LOFO XDN) is a Sun Hydraulics Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element, rated 50 gpm (200 L/min.) and installed in cavity T-2A. 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.
| LOFOXDN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| LOFOXDN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-2A |
|---|---|
| Series | 2 |
| Capacity | 50 gpm (200 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 drops/min. (0,7 cc/min.) |
| Pilot Volume Displacement | .07 in³ (1,1 cc) |
| Pilot Passage into Valve | .035 in. (0,9 mm) |
| Area Ratio, A3 to A1 | 1.8:1 |
| Area Ratio, A3 to A2 | 2.25:1 |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Seal kit - Cartridge | Viton: 990202006 |
How to read LOFOXDN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so LOFOXDN, LOFO-XDN, LOFO XDN are the same part.
| Model | LOFO — Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element |
|---|---|
| Control | X — Not Adjustable |
| Minimum Pilot Pressure | D — 50 psi (3,5 bar) |
| 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
- X — Not Adjustable
- L — Stroke Adjustment
Minimum Pilot Pressure options
- D — 50 psi (3,5 bar)
Seal Material options
- N — Buna-N
- V — Viton
Material/coating options
- /AP — Stainless Steel, Passivated
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-2A (544)
- 3BC Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BC — request assembly
- 3BD Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BD — request assembly
- 3BK Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BK — request assembly
- 3BL Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BL — request assembly
- 3BV Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BV — request assembly
- 3BW Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOXDN-3BW — request assembly
- 4BC Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BC — request assembly
- 4BD Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BD — request assembly
- 4BK Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BK — request assembly
- 4BL Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BL — request assembly
- 4BV Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BV — request assembly
- 4BW Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOXDN-4BW — request assembly
Technical features
- These valves have positive seals between port 2 and the pilot area.
- Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
- These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
- All ports will accept 5000 psi (350 bar).
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
- 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 LOFOXDN the same as LOFO-XDN?
Yes. Sun Hydraulics writes this part number as LOFOXDN. It is the model LOFO followed by the configuration code; hyphens, slashes and spaces are only dividers, so LOFOXDN, LOFO-XDN, LOFO XDN all refer to the same product.
Do you supply LOFOXDN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including LOFOXDN, 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.
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.
I need to discharge a large accumulator. How can I increase the capacity of my discharge circuit?
Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/LOFO
