DOFS-XHN – Sun Hydraulics Normally open, balanced poppet, logic element – pilot-to-close
Part number: DOFSXHN · DOFS-XHN · DOFS XHN
Normally open, balanced poppet, logic element – pilot-to-close. Cavity T-22A, capacity 30 gpm (120 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
DOFS-XHN overview
DOFSXHN (DOFS-XHN, DOFS XHN) is a Sun Hydraulics Sun Hydraulics Normally open, balanced poppet, logic element - pilot-to-close, rated 30 gpm (120 L/min.) and installed in cavity T-22A. 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.
| DOFSXHN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| DOFSXHN/LH | Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel |
| DOFSXHN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-22A |
|---|---|
| Series | 2 |
| Capacity | 30 gpm (120 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Minimum Pilot Pressure Required to Shift Valve | 300 psi (20 bar) |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 drops/min.@5000 psi (0,7 cc/min.@350 bar) |
| Pilot Volume Displacement | .02 in³ (0,33 cc) |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Seal kit - Cartridge | Viton: 990022006 |
How to read DOFSXHN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DOFSXHN, DOFS-XHN, DOFS XHN are the same part.
| Model | DOFS — Sun Hydraulics Normally open, balanced poppet, logic element - pilot-to-close |
|---|---|
| Control | X — Standard Pilot |
| Minimum Pilot Pressure | H — 300 psi (20 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 — Standard Pilot
Minimum Pilot Pressure options
- H — 300 psi (20 bar)
Seal Material options
- L — Extended Temp. Buna
- N — Buna-N
- V — Viton
- E — EPDM
Material/coating options
- /AP — Stainless Steel, Passivated
- /LH — Mild Steel, Zinc-Nickel
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-22A (70)
- N4A Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4A — request assembly
- N4B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4B — request assembly
- N4C Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4C — request assembly
- N4D Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4D — request assembly
- N4I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4I — request assembly
- N4J Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4J — request assembly
- N4K Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4K — request assembly
- N4L Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4L — request assembly
- N4T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4T — request assembly
- N4U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4U — request assembly
- N4V Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4V — request assembly
- N4W Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOFSXHN-N4W — request assembly
Technical features
- Unique balanced construction provides predictable switching with 5000 psi (350 bar) at both ports 1 and 2, with the external drain open and a minimum pilot pressure of 300 psi (20 bar).
- Port 1 and port 2 are fully sealed from port 3 and port 4. Ports 3 and 4 are positively sealed.
- Any backpressure at the drain port is directly additive to the required pilot pressure for reliable operation.
- Leakage rate between port 1 and port 2 is very low, typically less than 10 drops/min. at 5000 psi (0,7 cc/min at 350 bar).
- Valve will open when the pilot pressure falls below 145 psi (10 bar).
- These valves are hydraulically balanced between port 1 and port 2.
- 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.
- All ports will accept 5000 psi (350 bar).
- 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
- 999-901-334 (PDF 344 KB)
- FloatingStyleScrewInCartridge2 (PDF 1 MB)
- TT_US_Cavity-New (PDF 522 KB)
- TT_US_Logics-New (PDF 886 KB)
CAD files
Frequently asked questions
Is DOFSXHN the same as DOFS-XHN?
Yes. Sun Hydraulics writes this part number as DOFSXHN. It is the model DOFS followed by the configuration code; hyphens, slashes and spaces are only dividers, so DOFSXHN, DOFS-XHN, DOFS XHN all refer to the same product.
Do you supply DOFSXHN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DOFSXHN, 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/DOFS
