DFFA8DN – Sun Hydraulics 2-way, poppet directional valve with integral T-8A control cavity - control 1-2, Standard Material/Coating

DFFA8-DN Sun Hydraulics 2-way Valve – installation dimensions drawing, cavity T-18A
DFFA8-DN Sun Hydraulics 2-way Valve – hydraulic schematic symbol
DFFA8-DN Sun Hydraulics 2-way Valve – performance curve (pressure drop vs flow)
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Part number: DFFA8DN · DFFA8-DN · DFFA8 DN

Brand Sun HydraulicsType 2-wayCapacity 120 gpm (480 L/min.)Cavity T-18A

2-way, poppet directional valve with integral T-8A control cavity – control 1-2. Cavity T-18A, capacity 120 gpm (480 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

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SKU: DFFA8 Category: Brand:

DFFA8-DN overview

DFFA8DN (DFFA8-DN, DFFA8 DN) is a Sun Hydraulics Sun Hydraulics 2-way, poppet directional valve with integral T-8A control cavity - control 1-2, rated 120 gpm (480 L/min.) and installed in cavity T-18A. 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.

DFFA8DN/AP Stainless Steel, PassivatedStainless Steel, Passivated
DFFA8DN Standard Material/CoatingStandard Material/Coating

Specifications

CavityT-18A
Series4
Capacity120 gpm (480 L/min.)
Maximum Operating Pressure5000 psi (350 bar)
Maximum Valve Leakage at 110 SUS (24 cSt)10 drops/min.@5000 psi (0,7 cc/min.@350 bar)
Pilot Control CavityT-8A
Pilot Control Valve Installation Torque20 - 25 lbf ft (27 - 33 Nm)
Valve Hex Size1 5/8 in. (41,3 mm)
Valve Installation Torque350 - 375 lbf ft (474 - 508 Nm)
Model Weight1.10 lb (0,50 kg)
Seal kit - CartridgeViton: 990018006

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.

How to read DFFA8DN

Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DFFA8DN, DFFA8-DN, DFFA8 DN are the same part.

ModelDFFA8 — Sun Hydraulics 2-way, poppet directional valve with integral T-8A control cavity - control 1-2
Cracking PressureD — 50 psi (3,5 bar)
Seal MaterialN — Buna-N
Material / coatingAdd /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish.
Cracking Pressure options
  • D — 50 psi (3,5 bar)
Seal Material options
  • N — Buna-N
  • V — Viton
  • E — EPDM
Material/coating options
  • /AP — Stainless Steel, Passivated
  • — Standard Material/Coating

Manifold & standard assemblies

Sun manifolds for cavity T-18A (102)

View all 102 →

Technical features

  • NOTE: The main stage valve should first be installed to the correct torque value followed by the T-8A pilot control section into the main stage valve to its required torque value.
  • The -8 control option allows the pilot control valve to be incorporated directly into the end of the directional cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include solenoid operation, air pilot operation, and hydraulic pilot operation. See Pilot Control Cartridges.
  • 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.
  • 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

DFFA8-DN Sun Hydraulics 2-way Valve – hydraulic schematic symbol
hydraulic schematic symbol
DFFA8-DN Sun Hydraulics 2-way Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)

Downloads

Datasheet

Technical reference sheets

CAD files

Frequently asked questions

Is DFFA8DN the same as DFFA8-DN?

Yes. Sun Hydraulics writes this part number as DFFA8DN. It is the model DFFA8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so DFFA8DN, DFFA8-DN, DFFA8 DN all refer to the same product.

Do you supply DFFA8DN in the UAE, GCC and India?

Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DFFA8DN, 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.

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/DFFA8

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