LOFOZ-DN – Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch
Part number: LOFOZDN · LOFOZ-DN · LOFOZ DN
Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch. Cavity T-2A, capacity 50 gpm (200 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
LOFOZ-DN overview
LOFOZDN (LOFOZ-DN, LOFOZ DN) is a Sun Hydraulics Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch, 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.
| LOFOZDN | Buna-N sealsBuna-N |
|---|---|
| LOFOZDV | Viton sealsViton |
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) | 1 drops/min. (0,07 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 LOFOZDN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so LOFOZDN, LOFOZ-DN, LOFOZ DN are the same part.
| Model | LOFOZ — Sun Hydraulics Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch |
|---|---|
| Cracking 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. |
Cracking Pressure options
- D — 50 psi (3,5 bar)
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity T-2A (544)
- 3BC Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BC — request assembly
- 3BD Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BD — request assembly
- 3BK Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BK — request assembly
- 3BL Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BL — request assembly
- 3BV Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BV — request assembly
- 3BW Sun Hydraulics Cushion lock with shuttle Line mount manifoldLOFOZDN-3BW — request assembly
- 4BC Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BC — request assembly
- 4BD Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BD — request assembly
- 4BK Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BK — request assembly
- 4BL Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BL — request assembly
- 4BV Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BV — request assembly
- 4BW Sun Hydraulics Cushion lock with make up checks Line mount manifoldLOFOZDN-4BW — request assembly
Technical features
- These valves have positive seals between port 2 and the pilot area.
- This cartridge is supplied as a sealed, factory set unit and is not field serviceable. Any tampering will violate the product warranty.
- When torquing this cartridge into its cavity, a crow's foot wrench or similar will be required since the position switch precludes the use of a deep socket wrench.
- 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).
- Position switch is CE approved.
- 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 LOFOZDN the same as LOFOZ-DN?
Yes. Sun Hydraulics writes this part number as LOFOZDN. It is the model LOFOZ followed by the configuration code; hyphens, slashes and spaces are only dividers, so LOFOZDN, LOFOZ-DN, LOFOZ DN all refer to the same product.
Do you supply LOFOZDN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including LOFOZDN, 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.
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.
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/LOFOZ
