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PBFF-LAN – Sun Hydraulics Pilot-operated, pressure reducing valve with drilled piston orifice

Q: Is PBFFLAN the same as PBFF-LAN?

Yes. Sun Hydraulics writes this part number as PBFFLAN. It is the model PBFF followed by the configuration code; hyphens, slashes and spaces are only dividers, so PBFFLAN, PBFF-LAN, PBFF LAN all refer to the same product.

Brand: Sun Hydraulics
SKU: PBFF

PBFF-LAN Sun Hydraulics Reducing Valve – installation dimensions drawing, cavity T-2A

PBFF-LAN Sun Hydraulics Reducing Valve – hydraulic schematic symbol

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Part number: PBFFLAN · PBFF-LAN · PBFF LAN

Brand Sun HydraulicsType ReducingCapacity 20 gpm (80 L/min.)Cavity T-2A

Pilot-operated, pressure reducing valve with drilled piston orifice. Cavity T-2A, capacity 20 gpm (80 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

SKU: PBFF Category: Reducing Brand: Sun Hydraulics

PBFF-LAN overview

PBFFLAN (PBFF-LAN, PBFF LAN) is a Sun Hydraulics Sun Hydraulics Pilot-operated, pressure reducing valve with drilled piston orifice, rated 20 gpm (80 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.

PBFFLAN/LH	Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel
PBFFLAN	Standard Material/CoatingStandard Material/Coating

Specifications

Cavity	T-2A
Series	2
Capacity	20 gpm (80 L/min.)
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: 990202006

For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.

How to read PBFFLAN

Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so PBFFLAN, PBFF-LAN, PBFF LAN are the same part.

Model	PBFF — Sun Hydraulics Pilot-operated, pressure reducing valve with drilled piston orifice
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
O — Handknob with Panel Mount

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
N — 60 - 800 psi (4 - 55 bar), 200 psi (14 bar) Standard Setting
Q — 60 - 400 psi (4 - 28 bar), 200 psi (14 bar) Standard Setting
W — 150 - 4500 psi (10,5 - 315 bar), 200 psi (14 bar) Standard Setting
C — 150 - 6000 psi (10,5 - 420 bar), 200 psi (14 bar) Standard Setting

Seal Material options

N — Buna-N
V — Viton

Material/coating options

/LH — Mild Steel, Zinc-Nickel
— Standard Material/Coating

Manifold & standard assemblies

Sun manifolds for cavity T-2A (544)

View all 544 →

Technical features

These valves have the main stage orifice drilled into the piston rather than a staked-in orifice. This allows the valve to survive physically demanding applications.
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 three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges.
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.
If pilot flow consumption is critical, consider using direct acting reducing/relieving valves.
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.
Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis.
Pressure at port 3 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.
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

PBFF-LAN Sun Hydraulics Reducing Valve – performance curve (pressure drop vs flow) — performance curve (pressure drop vs flow)

PBFFLAN Sun Hydraulics Reducing Valve – 2D outline drawing — 2D outline drawing

Downloads

Datasheet

Full Datasheet (PBFF-PBFFLAN) (PDF 60 KB)

Technical reference sheets

CAD files

Frequently asked questions

Is PBFFLAN the same as PBFF-LAN?

Yes. Sun Hydraulics writes this part number as PBFFLAN. It is the model PBFF followed by the configuration code; hyphens, slashes and spaces are only dividers, so PBFFLAN, PBFF-LAN, PBFF LAN all refer to the same product.

Do you supply PBFFLAN in the UAE, GCC and India?

Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including PBFFLAN, 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.

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.

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.

How big is a drop of hydraulic oil?

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

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.

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 parts of the Sun cartridge valve are field serviceable?

Only external seals are serviceable. Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.

Manufacturer reference: https://www.sunhydraulics.com/model/PBFF

PBFF-LAN – Sun Hydraulics Pilot-operated, pressure reducing valve with drilled piston orifice

PBFF-LAN overview

Ordering codes

Specifications

How to read PBFFLAN