Pilot-to-open check valve with standard pilot assembly
Symbols
Port Headings and Sizes [ + ]
| Modifiers | Ports |
| ECB, /10, /11 | Ports 1 & 2: 3/8" NPTF; Port 3: 1/4" NPTF; |
Cartridge Technical Features [ + ]
This valve is a pilot to open check valve. It has a non-sealed pilot, a steel seat, and is non-vented. It allows free flow from the valve (port 2) to the load (port 1) and blocks flow in the opposite direction. Pressure at the pilot (port 3) will open the valve from port 1 to port 2. Pilot pressure needed at port 3 to open the valve is directly proportional to the load pressure at port 1. Pressure at port 2 directly opposes pilot pressure.
- For models with manual load release control option, turn load release clockwise to release load.
- 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.
- This 3 port pilot-to-open check valve and 3 port counterbalance valves are physically interchangeable (i.e. same cavities, same flow path for a given frame size). However, cartridge extension dimensions from the mounting surface may vary.
- Provides hose break protection, prevents loads from drifting and positively locks pressurized loads.
- Standard unsealed pilot allows air trapped in the pilot line to be purged from the circuit.
- Extremely low leakage. The seat and poppet are heat treated for long life. If the load drifts due to the valve, the seat has probably been damaged by contamination and the valve should be replaced.
- Optional external porting out of the hex end of the cartridge is available for external piloting. In this configuration, port 3 is blocked. See Control options E, and P.
- Pilot-to-open check cartridges are locking valves, not motion control valves. For motion control applications, use counterbalance valves.
- 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.
Cartridge Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-11A |
| Series | 1 |
| Capacity | 15 gpm60 L/min. |
| Maximum Operating Pressure | 5000 psi350 bar |
| Pilot Ratio | 3:13:1 |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 1 drops/min.0,07 cc/min. |
| Valve Hex Size | 7/8 in.22,2 mm |
| Valve Installation Torque | 30 - 35 lbf ft41 - 47 Nm |
| Model Weight | .20 lb0,10 kg |
| Seal kit - Cartridge | Buna: 990011007 |
| Seal kit - Cartridge | EPDM: 990011014 |
| Seal kit - Cartridge | Polyurethane: 990011002 |
| Seal kit - Cartridge | Viton: 990011006 |
Manifold Technical Data [ + ]
| Body Type | Line mountLine mount |
| Interface | NoneNone |
| Body Features | Ninety degreeNinety degree |
| Mounting Hole Diameter | .34 in.8.6 mm |
| Mounting Hole Depth | ThroughThrough |
| Mounting Hole Quantity | 22 |
| Open Cavities | 11 |
| Cavity | T-11A |
| Port Size | 3/8" NPTF3/8" NPTF |
CAD Files [ + ]
Symbol File Formats
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CAD File Formats
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Notes [ + ]
- Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
Additional Resources [ + ]
Highlights
- Check Valves, Flow Control and Priority Flow Control Valves Technical Tips
- QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
- Sun Expands Corrosion-Resistant Solutions
- Counterbalance/Pilot-to-Open Cartridge Valve Technical Tips
- New QuickSelect LoadHolding Selector Tool
- Standard Line Mount Manifolds for High Flow Valves
- Sun Offers Zinc-Nickel Plating for Corrosion Resistance
- Putting Sun at the heart of hydraulic regenerative braking systems
- Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
- Sun Cartridges with EPDM Seals
- Sun's New FLeX Series Solenoid Valves & Coils
- Pilot Controlled Directional Cartridges Technical Tips
- CavitySaver multi-function valves deliver single-cartridge solutions
- New FLeX Series Solenoid-Operated Directional Valves
Technical Tips
- Manufacturing Sun Cartridge Cavities (522.27 KB)
- Counterbalance and Pilot-to-Open Check Valves (1.19 MB)
- LoadAdaptive™ & LoadMatch™ Cartridges (713.18 KB)
Technical Information
- QuickDesign & SunDesign: Sun's 3- & 5-Axis Solutions
- Fluid Recommendations: Oil Viscosity, Cleanliness & Temperature
- Units of Measure, Settings, and Conversions
- Sun's Floating Style Screw-In Cartridge (1.06 MB)
- Cartridges: Materials of Construction
- Performance Data
- Sun Model Code Explanation; 999-901-334 (343.9 KB)
- Manifolds: Materials of Construction
- Cavity Information (S-171) and Tooling
- Custom Integrated Packages from Sun
- Removing Valves from Ductile Manifolds (73.96 KB)