PVFALAN/LH – Sun Hydraulics Pilot-operated, pressure reducing/relieving valve with drain to port 4, Mild Steel, Zinc-Nickel
Part number: PVFALAN · PVFA-LAN · PVFA LAN
Pilot-operated, 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.
PVFA-LAN overview
PVFALAN (PVFA-LAN, PVFA LAN) is a Sun Hydraulics Sun Hydraulics Pilot-operated, 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.
| PVFALAN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| PVFALAN/LH | Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel |
| PVFALAN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-22A |
|---|---|
| Series | 2 |
| Capacity | 20 gpm (80 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Factory Pressure Settings Established at | blocked control port (dead headed) (blocked control port (dead headed)) |
| Control Pilot Flow | 10 - 15 in³/min. (0,16 - 0,25 L/min.) |
| 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 | .60 lb (0,30 kg) |
| Seal kit - Cartridge | Viton: 990022006 |
Maximum pressure differentials for spring ranges: A and B are 3000 psi (210 bar) D and E are 2000 psi (140 bar) W is 5000 psi (350 bar) inlet pressure
How to read PVFALAN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so PVFALAN, PVFA-LAN, PVFA LAN are the same part.
| Model | PVFA — Sun Hydraulics Pilot-operated, pressure reducing/relieving valve with drain to port 4 |
|---|---|
| Control | L — Standard Screw Adjustment |
| Adjustment Range | A — 100 - 3000 psi (7 - 210 bar), 200 psi (14 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
- W — Hex Wrench Adjustment
- Y — Tri-Grip Handknob
Adjustment Range options
- A — 100 - 3000 psi (7 - 210 bar), 200 psi (14 bar) Standard Setting
- B — 50 - 1500 psi (3,5 - 105 bar), 200 psi (14 bar) Standard Setting
- D — 25 - 800 psi (1,7 - 55 bar), 200 psi (14 bar) Standard Setting
- E — 25 - 400 psi (1,7 - 28 bar), 200 psi (14 bar) Standard Setting
- W — 150 - 4500 psi (10,5 - 315 bar), 200 psi (14 bar) Standard Setting
- H — 30 - 3000 psi (2 - 210 bar), 200 psi (14 bar) Standard Setting
Seal Material options
- 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 manifoldPVFALAN/LH-N4A — request assembly
- N4B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4B — request assembly
- N4C Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4C — request assembly
- N4D Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4D — request assembly
- N4I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4I — request assembly
- N4J Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4J — request assembly
- N4K Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4K — request assembly
- N4L Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4L — request assembly
- N4T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4T — request assembly
- N4U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4U — request assembly
- N4V Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4V — request assembly
- N4W Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldPVFALAN/LH-N4W — request assembly
Technical features
- Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
- Pilot operated valves exhibit very low dead-band transition between reducing and relieving modes.
- Recommended maximum inlet pressure is determined by the adjustment range. Ranges D, E, N, and Q are tested with a 2000 psi (140 bar) maximum differential between inlet and reduced pressure. Ranges A, B, and H are tested with a 3000 psi (210 bar) maximum differential between inlet and reduced pressure. Ranges C and W are tested with 5000 psi (350 bar) of inlet pressure.
- Pressure at port 4 should not exceed 5000 psi (350 bar).
- Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis.
- 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).
- Pilot operated reducing, reducing/relieving valves by nature are not fast acting valves. For superior dynamic response, consider direct acting valves.
- W and Y controls (where applicable) can be specified with or without a special setting. When no special setting is specified, the valve is adjustable throughout its full range using the W or Y control. When a special setting is specified, this setting represents the maximum setting of the valve.
- 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 PVFALAN the same as PVFA-LAN?
Yes. Sun Hydraulics writes this part number as PVFALAN. It is the model PVFA followed by the configuration code; hyphens, slashes and spaces are only dividers, so PVFALAN, PVFA-LAN, PVFA LAN all refer to the same product.
Do you supply PVFALAN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including PVFALAN, 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.
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 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.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/PVFA
