PSFB-LAN – Sun Hydraulics Direct-acting, pressure reducing/relieving valve with drain to port 4
Part number: PSFBLAN · PSFB-LAN · PSFB LAN
Direct-acting, pressure reducing/relieving valve with drain to port 4. Cavity T-22A, capacity 20 gpm (80 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
PSFB-LAN overview
PSFBLAN (PSFB-LAN, PSFB LAN) is a Sun Hydraulics Sun Hydraulics Direct-acting, pressure reducing/relieving valve with drain to port 4, rated 20 gpm (80 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.
| PSFBLAN | Buna-N sealsBuna-N |
|---|---|
| PSFBLAV | Viton sealsViton |
Specifications
| Cavity | T-22A |
|---|---|
| Series | 2 |
| Capacity | 20 gpm (80 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Factory Pressure Settings Established at | 0.25 gpm |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 3 in³/min.@1000 psi (50 cc/min.@70 bar) |
| Adjustment - No. of CW Turns from Min. to Max. setting | 5 |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Adjustment Screw Internal Hex Size | 5/32 in. (4 mm) |
| Locknut Hex Size | 9/16 in. (15 mm) |
| Locknut Torque | 80 - 90 lbf in. (9 - 10 Nm) |
| Model Weight | .30 lb (0,15 kg) |
| Seal kit - Cartridge | Viton: 990022006 |
How to read PSFBLAN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so PSFBLAN, PSFB-LAN, PSFB LAN are the same part.
| Model | PSFB — Sun Hydraulics Direct-acting, pressure reducing/relieving valve with drain to port 4 |
|---|---|
| Control | L — Standard Screw Adjustment |
| Adjustment Range | A — 750 - 3000 psi (50 - 210 bar), 1000 psi (70 bar) Standard Setting |
| 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
- C — Tamper Resistant - Factory Set
- K — Handknob
- L — Standard Screw Adjustment
Adjustment Range options
- A — 750 - 3000 psi (50 - 210 bar), 1000 psi (70 bar) Standard Setting
- B — 300 - 1500 psi (20 - 105 bar), 500 psi (35 bar) Standard Setting
- D — 200 - 800 psi (14 - 55 bar), 400 psi (28 bar) Standard Setting
- E — 100 - 400 psi (7 - 28 bar), 200 psi (14 bar) Standard Setting
- S — 50 - 200 psi (3,5 - 14 bar), 100 psi (7 bar) Standard Setting
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity T-22A (70)
- N4A Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4A — request assembly
- N4B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4B — request assembly
- N4C Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4C — request assembly
- N4D Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4D — request assembly
- N4I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4I — request assembly
- N4J Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4J — request assembly
- N4K Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4K — request assembly
- N4L Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4L — request assembly
- N4T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4T — request assembly
- N4U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4U — request assembly
- N4V Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4V — request assembly
- N4W Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPSFBLAN-N4W — request assembly
Technical features
- Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
- All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure.
- Suitable for accumulator circuits since the absence of pilot control flow results in reduced secondary circuit leakage.
- Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.
- Unlike pilot operated versions, direct acting valves exhibit a transitional step between reducing and relieving modes. This step equals 5% of the high end of the adjustment range, independent of the valve setting. Therefore, these valves may not be suitable for counterbalancing applications.
- Direct operated version offers superior dynamic response compared to equivalent pilot operated models.
- Pressure on the drain (port 4) is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
- Leakage specified in Technical Data is out of port 3 with a supply pressure of 2000 psi (140 bar) and the valve set at mid range. This leakage is directly proportional to pressure differential and inversely proportional to viscosity expressed in centistokes.
- Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit.
- By controlling the pressure at the drain (port 4), the effective setting of the valve can be increased over the nominal valve setting.
- 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_Red-Rel (PDF 229 KB)
CAD files
Frequently asked questions
Is PSFBLAN the same as PSFB-LAN?
Yes. Sun Hydraulics writes this part number as PSFBLAN. It is the model PSFB followed by the configuration code; hyphens, slashes and spaces are only dividers, so PSFBLAN, PSFB-LAN, PSFB LAN all refer to the same product.
Do you supply PSFBLAN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including PSFBLAN, 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.
What do you mean by maximum differential?
Our reducing valves are outside-in valves; the supply pressure on the outside of the working parts is higher than the inside. At some pressure differential, the outside (sleeve) will close in on the piston and cause the valve to stick. A D range is adjustable from 25 to 800 psi with a maximum differential of 2000 psi. This means you could set the valve at 600 psi and expect it to work correctly with a supply pressure of 2600 psi. The valve may work at higher differentials, but we do not recommend it. The W and C ranges are tested over their entire range with an inlet pressure of 5000 psi. All direct-acting valves are tested with an inlet pressure of 5000 psi.
Will your reducing/relieving valve relieve my pump to tank?
No. A reducing/relieving valve throttles a supply of oil to maintain a set pressure in a secondary circuit. The valve is open until the secondary or downstream pressure rises to the setting of the valve at which time it starts to close to limit the pressure. If the secondary or downstream pressure is caused to go above the setting, the valve shifts into relieving mode and throttles the secondary circuit back to tank to prevent over-pressure. At no time can the valve connect the supply to tank.
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.
Can I back flow through a reducing valve from port 1 to port 2?
Yes. A reducing or reducing/relieving valve is normally open. If the pressure in the secondary circuit is less than the setting, it will be open.
2 caveats: (1) If the valve is in the reducing mode and you suddenly reverse the flow, the valve will not have time to open and will shift into relieving mode or (2) If the back flow generates a pressure drop through the valve that exceeds the setting, the valve will shift into the relieving mode.
When in doubt, use a reverse flow check.
What are the tolerances on pressure settings for Sun's pressure control valves?
Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page.
I need a reducer on B. Can I connect the drain to A?
Yes. If you look in the sandwich section you will see that we offer many such packages. When you are pressurizing B, A is connected to tank, allowing the reducer to do its job. When you reverse, the drain or tank port of the reducer is pressurized by A. This increases the setting of the reducer and helps keep the reducer open in the reverse flow direction.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/PSFB
