SUN HYDRAULICS
RELIEF CART
RDDALCN
- SUN HYDRAULICS
- Material:RDDALCN
- Model:RDDA-LCN
- 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 RDDALCN (RDDALCN) is a direct-acting relief cartridge, designed to function as a pressure-limiting valve to safeguard hydraulic components from pressure spikes. This normally closed valve opens when the inlet pressure reaches the set threshold, redirecting excess flow to the tank port and thereby controlling pressure increase. Known for their smooth operation and rapid response, these valves are essentially zero-leak, dirt-tolerant, and immune to silting. The RDDALCN is interchangeable with other 2-port relief cartridges of the same frame size and flow path, making it versatile in application. It can handle maximum pressure at port 2 and is suitable for cross-port relief circuits as well as load-holding applications. The valve's adjustment screw seals are exposed to system pressure, necessitating pressure removal prior to adjustment. The RDDALCN is relatively insensitive to changes in oil temperature and contamination levels, ensuring consistent performance. Users should select a spring range that places the desired setting between midrange and maximum for optimal repeatability. For systems utilizing phosphate ester fluids, cartridges with EPDM seals are recommended; these seals are vulnerable to petroleum-based substances. The floating style construction minimizes internal binding risks due to installation torque or machining variations. Specifications include a T-10A cavity, Series 1 capacity of 25 gpm (95 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum valve leakage at reseat of 10 drops/min (0.7 cc/min). The valve has an installation torque range of 30-35 lbf ft (41-47 Nm) with adjustment facilitated by a hex screw size of 5/32 in (4 mm).
The Sun Hydraulics RDDALCN (RDDALCN) is a direct-acting relief cartridge, designed to function as a pressure-limiting valve to safeguard hydraulic components from pressure spikes. This normally closed valve opens when the inlet pressure reaches the set threshold, redirecting excess flow to the tank port and thereby controlling pressure increase. Known for their smooth operation and rapid response, these valves are essentially zero-leak, dirt-tolerant, and immune to silting. The RDDALCN is interchangeable with other 2-port relief cartridges of the same frame size and flow path, making it versatile in application. It can handle maximum pressure at port 2 and is suitable for cross-port relief circuits as well as load-holding applications. The valve's adjustment screw seals are exposed to system pressure, necessitating pressure removal prior to adjustment. The RDDALCN is relatively insensitive to changes in oil temperature and contamination levels, ensuring consistent performance. Users should select a spring range that places the desired setting between midrange and maximum for optimal repeatability. For systems utilizing phosphate ester fluids, cartridges with EPDM seals are recommended; these seals are vulnerable to petroleum-based substances. The floating style construction minimizes internal binding risks due to installation torque or machining variations. Specifications include a T-10A cavity, Series 1 capacity of 25 gpm (95 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum valve leakage at reseat of 10 drops/min (0.7 cc/min). The valve has an installation torque range of 30-35 lbf ft (41-47 Nm) with adjustment facilitated by a hex screw size of 5/32 in (4 mm).
Direct-acting relief cartridges are normally closed, pressure-limiting valves used to protect hydraulic components from pressure transients. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to limit the pressure rise. These valves are smooth and quiet, essentially zero leak, dirt tolerant, immune to silting and are very fast.
- All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
- Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
- The seals on the adjust screw are exposed to system pressure which means this valve can only be adjusted when the pressure is removed. The setting procedure is; check the setting, remove the pressure, adjust the valve, check the new setting.
- Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
- Select a spring range where the desired relief setting is approximately mid-range to high between the minimum and maximum pressure to ensure maximum valve repeatability.
- Suitable for use in load holding applications.
- Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
- 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.
| Cavity | T-10A |
| Series | 1 |
| Capacity | 25 gpm95 L/min. |
| Factory Pressure Settings Established at | 4 gpm15 L/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. |
| Reseat | >90% of setting>90% of setting |
| Adjustment - Number of Clockwise Turns to Increase Setting | 66 |
| 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: 990-310-006 |
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