DSFD-XEN – Sun Hydraulics Low side, 3-position, hot oil shuttle valve with delayed shift

DSFD-XEN Sun Hydraulics Shuttle Valve – installation dimensions drawing, cavity T-33A
DSFD-XEN Sun Hydraulics Shuttle Valve – hydraulic schematic symbol
DSFD-XEN Sun Hydraulics Shuttle Valve – performance curve (pressure drop vs flow)
DSFDXEN Sun Hydraulics Shuttle Valve – 2D outline drawing
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Part number: DSFDXEN · DSFD-XEN · DSFD XEN

Brand Sun HydraulicsType ShuttleCapacity 40 gpm (160 L/min.)Cavity T-33A

Low side, 3-position, hot oil shuttle valve with delayed shift. Cavity T-33A, capacity 40 gpm (160 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

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SKU: DSFD Category: Brand:

DSFD-XEN overview

DSFDXEN (DSFD-XEN, DSFD XEN) is a Sun Hydraulics Sun Hydraulics Low side, 3-position, hot oil shuttle valve with delayed shift, rated 40 gpm (160 L/min.) and installed in cavity T-33A. 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.

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

Specifications

CavityT-33A
Series3
Capacity40 gpm (160 L/min.)
Maximum Operating Pressure5000 psi (350 bar)
Pilot Flow23 in³/min. (0,38 L/min.)
Valve Hex Size1 1/4 in. (31,8 mm)
Valve Installation Torque150 - 160 lbf ft (203 - 217 Nm)
Model Weight1.40 lb (0,65 kg)
Seal kit - CartridgeViton: 990033006

How to read DSFDXEN

Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DSFDXEN, DSFD-XEN, DSFD XEN are the same part.

ModelDSFD — Sun Hydraulics Low side, 3-position, hot oil shuttle valve with delayed shift
ControlX — Not Adjustable
Shifting PressureE — 75 psi (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.
Control options
  • X — Not Adjustable
Shifting Pressure options
  • E — 75 psi (5 bar)
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-33A (26)

View all 26 →

Technical features

  • The valve is designed to center quickly and stay centered until conditions are correct for it to open as explained in the next 2 technical features.
  • The valve prevents flow transients downstream of the hot oil relief in 2 ways. The shuttle stays centered until one side of the transmission actually becomes the low side. Once a low side has been established the valve opens in a controlled fashion after a delay of about 2 seconds.
  • The valve centers and remains centered as long as pressures at ports 2 and 4 are both at or above a value equal to 300 psi (20 bar) plus the setting of the hot oil relief. For instance, if the hot oil relief is set at 200 psi (14 bar) the shuttle will not open unless one side of the transmission drops below 500 psi (34 bar).
  • The spool incorporates a hydraulic stop that eliminates mechanical impact and therefore the potential for internal damage.
  • The hydraulic stop results in a small pilot flow from the high side work port (port 2 or 4) to the common port (port 3).
  • A unique feature due to the hydraulic stop is that the hot oil relief setting can be confirmed with the transmission in neutral.
  • Although this valve goes into a 4-port cavity, the nose (port 1) is not used.
  • 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

DSFD-XEN Sun Hydraulics Shuttle Valve – hydraulic schematic symbol
hydraulic schematic symbol
DSFD-XEN Sun Hydraulics Shuttle Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)
DSFDXEN Sun Hydraulics Shuttle Valve – 2D outline drawing
2D outline drawing

Downloads

Datasheet

Technical reference sheets

CAD files

Frequently asked questions

Is DSFDXEN the same as DSFD-XEN?

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

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

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

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 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/DSFD

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