SUN HYDRAULICS
SEQUENCE CART
SCCALDN
- SUN HYDRAULICS
- Material:SCCALDN
- Model:SCCA-LDN
- Summary:Cartridge
Due to extremely high demand, please call 800-289-1330 for availability
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics SCCALDN (SCCALDN) is a direct-acting sequence valve with a reverse flow check, designed to supply secondary circuits with flow once the inlet port pressure exceeds the valve setting. It features an integral check valve for reverse flow from port 2 to port 1 and controls the pressure at port 1 relative to the drain port 3. This zero pilot flow valve requires that port 3 is connected to maintain a pressure reference; blocking this port can lead to malfunction due to reciprocating seal weepage. The valve setting can be adjusted by applying pressure at port 3, up to a maximum of 5000 psi (350 bar), making it suitable for load holding applications. All three-port sequence cartridges are interchangeable, ensuring compatibility across similar frame sizes. The valve incorporates EPDM seals for use with phosphate ester fluids, while exposure to petroleum-based substances should be avoided as it may damage the seals. Corrosion-resistant options are available, identified by suffixes AP or LH in the model code, corresponding to stainless steel or zinc-nickel plating respectively. The Sun floating style construction minimizes internal binding risks due to installation torque or machining variations. Key specifications include a cavity T-11A series, capacity of 15 gpm (60 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum leakage at reseat of 10 drops/min (0.7 cc/min). The check cracking pressure is set at 40 psi (2.8 bar), with adjustments made via a screw requiring specific torque settings for secure installation. The cartridge weighs approximately .30 lb (.15 kg) and uses Viton seals identified by part number 990011006 for maintenance and replacements.
The Sun Hydraulics SCCALDN (SCCALDN) is a direct-acting sequence valve with a reverse flow check, designed to supply secondary circuits with flow once the inlet port pressure exceeds the valve setting. It features an integral check valve for reverse flow from port 2 to port 1 and controls the pressure at port 1 relative to the drain port 3. This zero pilot flow valve requires that port 3 is connected to maintain a pressure reference; blocking this port can lead to malfunction due to reciprocating seal weepage. The valve setting can be adjusted by applying pressure at port 3, up to a maximum of 5000 psi (350 bar), making it suitable for load holding applications. All three-port sequence cartridges are interchangeable, ensuring compatibility across similar frame sizes. The valve incorporates EPDM seals for use with phosphate ester fluids, while exposure to petroleum-based substances should be avoided as it may damage the seals. Corrosion-resistant options are available, identified by suffixes AP or LH in the model code, corresponding to stainless steel or zinc-nickel plating respectively. The Sun floating style construction minimizes internal binding risks due to installation torque or machining variations. Key specifications include a cavity T-11A series, capacity of 15 gpm (60 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum leakage at reseat of 10 drops/min (0.7 cc/min). The check cracking pressure is set at 40 psi (2.8 bar), with adjustments made via a screw requiring specific torque settings for secure installation. The cartridge weighs approximately .30 lb (.15 kg) and uses Viton seals identified by part number 990011006 for maintenance and replacements.
Direct-acting sequence valves with reverse-flow check will supply a secondary circuit with flow once the pressure at the inlet (port 1) has exceeded the valve setting. Additionally, these valves incorporate an integral check valve to provide reverse flow from port 2 (sequence) to port 1 (inlet). The pressure setting of a sequence valve controls the pressure at port 1 relative to the pressure at the drain (port 3).
- Although this is a zero pilot flow valve, port 3 (drain) must be connected to maintain a pressure reference in the control chamber. If port 3 is blocked, reciprocating seal weepage will cause the valve to malfunction.
- Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
- Suitable for use in load holding applications.
- All 3 port sequence cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size).
- 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.
- 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.
| Cavity | T-11A |
| Series | 1 |
| Capacity | 15 gpm60 L/min. |
| Factory Pressure Settings Established at | 2 in³/min.30 cc/min. |
| Maximum Operating Pressure | 5000 psi350 bar |
| Response Time - Typical | 2 ms2 ms |
| Maximum Valve Leakage at Reseat | 10 drops/min.0,7 cc/min. |
| Check Cracking Pressure | 40 psi2,8 bar |
| Adjustment - Number of Clockwise Turns to Increase Setting | 55 |
| Valve Hex Size | 7/8 in.22,2 mm |
| Valve Installation Torque | 30 - 35 lbf ft41 - 47 Nm |
| Adjustment Screw Internal Hex Size | 5/32 in.4 mm |
| Locknut Hex Size | 9/16 in.15 mm |
| Locknut Torque | 80 - 90 lbf in.9 - 10 Nm |
| Model Weight | .30 lb0,15 kg |
| Seal kit - Cartridge | Viton: 990-011-006 |
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Additional Resources
- Sequence Valves Technical Tips
- Sun Offers Zinc-Nickel Plating for Corrosion Resistance
- Sun Cartridges with EPDM Seals
- Sun Expands Corrosion-Resistant Solutions
- QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
- Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
- Manufacturing Sun Cartridge Cavities
- Sequence Valves
- Sun's Floating Style Screw-In Cartridge
- Units of Measure, Settings, and Conversions
- Sun Model Code Explanation; 999-901-334
- Cavity Information (S-171) and Tooling
- Cartridges: Materials of Construction
- Fluid and Temperature Recommendations
- Performance Data
