PRBB-LAN – Sun Hydraulics Direct-acting, pressure reducing/relieving valve

Q: Is PRBBLAN the same as PRBB-LAN?

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

Brand: Sun Hydraulics
SKU: PRBB

PRBB-LAN Sun Hydraulics Reducing/Relieving Valve – installation dimensions drawing, cavity T-163A

PRBB-LAN Sun Hydraulics Reducing/Relieving Valve – hydraulic schematic symbol

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Part number: PRBBLAN · PRBB-LAN · PRBB LAN

Brand Sun HydraulicsType Reducing/RelievingCapacity 5 gpm (20 L/min.)Cavity T-163A

Direct-acting, pressure reducing/relieving valve. Cavity T-163A, capacity 5 gpm (20 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

SKU: PRBB Category: Reducing/Relieving Brand: Sun Hydraulics

PRBB-LAN overview

PRBBLAN (PRBB-LAN, PRBB LAN) is a Sun Hydraulics Sun Hydraulics Direct-acting, pressure reducing/relieving valve, rated 5 gpm (20 L/min.) and installed in cavity T-163A. 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.

PRBBLAN/AP	Stainless Steel, PassivatedStainless Steel, Passivated
PRBBLAN/LH	Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel
PRBBLAN	Standard Material/CoatingStandard Material/Coating

Specifications

Cavity	T-163A
Series	0
Capacity	5 gpm (20 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)	2 in³/min. (30 cc/min.)
Adjustment - No. of CW Turns from Min. to Max. setting	7
Valve Hex Size	3/4 in. (19,1 mm)
Valve Installation Torque	20 - 25 lbf ft (27 - 33 Nm)
Locknut Hex Size	1/2 in. (12,7 mm)
Locknut Torque	80 - 90 lbf in. (9 - 10 Nm)
Model Weight	.30 lb (0,15 kg)
Seal kit - Cartridge	Viton: 990163006

How to read PRBBLAN

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

Model	PRBB — Sun Hydraulics Direct-acting, pressure reducing/relieving valve
Control	L — Standard Screw Adjustment
Adjustment Range	A — 500 - 3000 psi (35 - 210 bar), 700 psi (50 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

L — Standard Screw Adjustment
C — Tamper Resistant - Factory Set
K — Handknob

Adjustment Range options

A — 500 - 3000 psi (35 - 210 bar), 700 psi (50 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
S — 25 - 200 psi (1,7 - 14 bar), 100 psi (7 bar) Standard Setting
W — 750 - 4500 psi (50 - 315 bar), 1000 psi (70 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-163A (53)

View all 53 →

Technical features

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.
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 at port 3 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.
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.
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.
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

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

Downloads

Datasheet

Full Datasheet (PRBB-PRBBLAN) (PDF 100 KB)

Technical reference sheets

CAD files

Frequently asked questions

Is PRBBLAN the same as PRBB-LAN?

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

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

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

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 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.

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/PRBB

PRBB-LAN – Sun Hydraulics Direct-acting, pressure reducing/relieving valve

PRBB-LAN overview

Ordering codes

Specifications

How to read PRBBLAN