COBAXCN – Sun Hydraulics Pilot-to-close check valve, Standard Material/Coating
Part number: COBAXCN · COBA-XCN · COBA XCN
Pilot-to-close check valve. Cavity T-163A, capacity 10 gpm (40 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
COBA-XCN overview
COBAXCN (COBA-XCN, COBA XCN) is a Sun Hydraulics Sun Hydraulics Pilot-to-close check valve, rated 10 gpm (40 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.
| COBAXCN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| COBAXCN/LH | Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel |
| COBAXCN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-163A |
|---|---|
| Series | 0 |
| Capacity | 10 gpm (40 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Pilot Ratio | 3:1 |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 1 drops/min. (0,07 cc/min.) |
| Valve Hex Size | 3/4 in. (19,1 mm) |
| Valve Installation Torque | 20 - 25 lbf ft (27 - 33 Nm) |
| Model Weight | .20 lb (0,10 kg) |
| Seal kit - Cartridge | Viton: 990163006 |
How to read COBAXCN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so COBAXCN, COBA-XCN, COBA XCN are the same part.
| Model | COBA — Sun Hydraulics Pilot-to-close check valve |
|---|---|
| Control | X — Standard Pilot |
| Cracking Pressure | C — 30 psi (2 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
- B — External 1/4 BSPP Pilot Port, Port 3 blocked
- L — Stroke Adjustment
- X — Standard Pilot
Cracking Pressure options
- C — 30 psi (2 bar)
- D — 50 psi (3,5 bar)
- E — 75 psi (5 bar)
- F — 100 psi (7 bar)
Seal Material options
- L — Extended Temp. Buna
- 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)
- J2A Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2A — request assembly
- J2B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2B — request assembly
- J2H Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2H — request assembly
- J2I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2I — request assembly
- J2T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2T — request assembly
- J2U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldCOBAXCN-J2U — request assembly
- J6A Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6A — request assembly
- J6B Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6B — request assembly
- J6H Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6H — request assembly
- J6I Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6I — request assembly
- J6T Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6T — request assembly
- J6U Sun Hydraulics Ninety degree with reverse flow check – sequence Line mount manifoldCOBAXCN-J6U — request assembly
Technical features
- Features hardened steel seats for excellent wear characteristics and contamination tolerance.
- Product is not available with A and B spring ranges (4 and 15 psi (0,3 and 1 bar)).
- Pressure at the port 2 area directly opposes pilot pressure.
- Reverse flow through the valve from port 2 to port 1 is not possible under any condition.
- Nominal pilot ratio is 3:1. This means that a pressure of 1000 psi (70 bar) at the pilot port will close a valve against a pressure of 3000 psi (205 bar) at port 1. Any decay or loss of pilot pressure could allow the valve to open, even if it is a momentary decay or loss.
- 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
Downloads
Datasheet
Technical reference sheets
- 999-901-334 (PDF 344 KB)
- FloatingStyleScrewInCartridge2 (PDF 1 MB)
- TT_US_CIRCUIT-SAVERS-New (PDF 466 KB)
- TT_US_Cavity-New (PDF 522 KB)
CAD files
Frequently asked questions
Is COBAXCN the same as COBA-XCN?
Yes. Sun Hydraulics writes this part number as COBAXCN. It is the model COBA followed by the configuration code; hyphens, slashes and spaces are only dividers, so COBAXCN, COBA-XCN, COBA XCN all refer to the same product.
Do you supply COBAXCN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including COBAXCN, 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.
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.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/COBA
