LHFA-XFN – Sun Hydraulics Bypass/restrictive, priority modulating element
Roll over image to zoom in
Part number: LHFAXFN · LHFA-XFN · LHFA XFN
Bypass/restrictive, priority modulating element. Cavity T-32A, capacity 30 gpm (120 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
LHFA-XFN overview
LHFAXFN (LHFA-XFN, LHFA XFN) is a Sun Hydraulics Sun Hydraulics Bypass/restrictive, priority modulating element, rated 30 gpm (120 L/min.) and installed in cavity T-32A. 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.
| LHFAXFN | Buna-N sealsBuna-N |
|---|---|
| LHFAXFV | Viton sealsViton |
| LHFAXFE | EPDM sealsEPDM |
Specifications
| Cavity | T-32A |
|---|---|
| Series | 2 |
| Capacity | 30 gpm (120 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Model Weight | .70 lb (0,30 kg) |
| Seal kit - Cartridge | Viton: 990032006 |
How to read LHFAXFN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so LHFAXFN, LHFA-XFN, LHFA XFN are the same part.
| Model | LHFA — Sun Hydraulics Bypass/restrictive, priority modulating element |
|---|---|
| Control | X — Not Adjustable |
| Differential Pressure | F — 100 psi (7 bar) |
| 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
- X — Not Adjustable
Differential Pressure options
- E — 75 psi (5 bar)
- F — 100 psi (7 bar)
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Manifold & standard assemblies
Sun manifolds for cavity T-32A (19)
- NMB Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMB — request assembly
- NMC Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMC — request assembly
- NMD Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMD — request assembly
- NMJ Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMJ — request assembly
- NMK Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMK — request assembly
- NML Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NML — request assembly
- NMU Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMU — request assembly
- NMV Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMV — request assembly
- NMW Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NMW — request assembly
- NNB Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NNB — request assembly
- NNC Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NNC — request assembly
- NND Sun Hydraulics Ninety degree Line mount manifoldLHFAXFN-NND — request assembly
Technical features
- Bypass flow is not available until priority flow requirements are satisfied.
- Priority flow can be turned on or off with a pilot-sized, three-way solenoid valve on port 1.
- Bypass pressure at port 4 can be higher than pressure at control port 2.
- Cartridges 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
Downloads
Datasheet
Technical reference sheets
CAD files
Frequently asked questions
Is LHFAXFN the same as LHFA-XFN?
Yes. Sun Hydraulics writes this part number as LHFAXFN. It is the model LHFA followed by the configuration code; hyphens, slashes and spaces are only dividers, so LHFAXFN, LHFA-XFN, LHFA XFN all refer to the same product.
Do you supply LHFAXFN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including LHFAXFN, 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.
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.
Why do you call it a hammer valve?
The valve was developed originally to power demolition hammers. The hammers are aftermarket accessories that are mounted on a large variety of excavators. The "hammer" circuit provides a method of tapping into the existing hydraulic system of the excavator, turning the tool on and off, controlling flow, and limiting pressure.
Every manufacturer of hammers has very specific needs as far as flow and pressure and there is a large disparity of hydraulic systems in the excavators. For this reason, Sun has never had a catalog package for this circuit.
Sun does not and cannot provide technical support for "hammer valve" installations.
The LH*A looks like just the valve I need to pressure compensate my load-sense whatever. Will it work?
The LH*A family of valves has been optimized to be used in a package to provide a power source for hydraulic tools. We can quantify the performance of the valve in static conditions but we cannot tell you how it will do in your application.
For instance: You want to use the valve as a compensator for a load-sense power steering package. When you are steering the machine and raising an implement, the valve is in a bypass mode (throttling on the bypass side). When the implement actuator bottoms out, pressure jumps to maximum and now the valve needs to change to the restrictive mode. Since the LH*A is balanced against pressure on the bypass side the only thing moving the spool is its own spring. The time this takes is dependent on where the spool was to begin with and where it has to go.
During this transition the steering will see the pressure differential across it suddenly change from about 150 psi (10 bar) to a system pressure of say 3000 psi (200 bar) and suddenly back down to about 150 psi (10 bar). When this scenario was described to me it was termed the broken thumb syndrome.
Sun does not and cannot provide technical support for this type of application. The valve has been successfully used in similar applications. What is necessary to make it work is up to whoever is doing the application.
Manufacturer reference: https://www.sunhydraulics.com/model/LHFA
