LOKB-XDN – Sun Hydraulics Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2
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Part number: LOKBXDN · LOKB-XDN · LOKB XDN
Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2. Cavity T-19AU, capacity 300 gpm (1100 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
LOKB-XDN overview
LOKBXDN (LOKB-XDN, LOKB XDN) is a Sun Hydraulics Sun Hydraulics Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2, rated 300 gpm (1100 L/min.) and installed in cavity T-19AU. 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.
| LOKBXDN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| LOKBXDN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-19AU |
|---|---|
| Series | 4 |
| Capacity | 300 gpm (1100 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 drops/min. (0,7 cc/min.) |
| Pilot Volume Displacement | .47 in³ (7,7 cc) |
| Area Ratio, A3 to A1 | 1.8:1 |
| Area Ratio, A3 to A2 | 2.25:1 |
| Control Orifice Diameter | .035 in. (0,9 mm) |
| Valve Hex Size | 1 5/8 in. (41,3 mm) |
| Valve Installation Torque | 350 - 375 lbf ft (474 - 508 Nm) |
| Model Weight | 2.60 lb (1,20 kg) |
| Seal kit - Cartridge | Viton: 990019006 |
How to read LOKBXDN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so LOKBXDN, LOKB-XDN, LOKB XDN are the same part.
| Model | LOKB — Sun Hydraulics Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2 |
|---|---|
| Control | X — Not Adjustable |
| Cracking Pressure | D — 50 psi (3,5 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
Cracking Pressure options
- D — 50 psi (3,5 bar)
Seal Material options
- N — Buna-N
- V — Viton
Material/coating options
- /AP — Stainless Steel, Passivated
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-19AU (20)
- KJ5 Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJ5 — request assembly
- KJ6 Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJ6 — request assembly
- KJ8 Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJ8 — request assembly
- KJQ Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJQ — request assembly
- KJR Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJR — request assembly
- KJS Sun Hydraulics Through port 1 with gauge port Line mount manifoldLOKBXDN-KJS — request assembly
- KK5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KK5 — request assembly
- KK6 Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KK6 — request assembly
- KK8 Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KK8 — request assembly
- KKQ Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KKQ — request assembly
- KKR Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KKR — request assembly
- KKS Sun Hydraulics Ninety degree with gauge port Line mount manifoldLOKBXDN-KKS — request assembly
Technical features
- These valves will work in Sun's standard T-19A cavity at lower capacity. To realize the full stated capacity, the T-19AU cavity should be used.
- These valves open quickly when vented. Time to close is difficult to predict as it is dependent on the rate of flow and the pressure drop created as it closes.
- Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
- These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
- All ports will accept 5000 psi (350 bar).
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
- 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 LOKBXDN the same as LOKB-XDN?
Yes. Sun Hydraulics writes this part number as LOKBXDN. It is the model LOKB followed by the configuration code; hyphens, slashes and spaces are only dividers, so LOKBXDN, LOKB-XDN, LOKB XDN all refer to the same product.
Do you supply LOKBXDN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including LOKBXDN, 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 to discharge a large accumulator. How can I increase the capacity of my discharge circuit?
Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.
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/LOKB
