SUN HYDRAULICS
RDHALDN
$175.90 USD
Tags:
- SUN HYDRAULICS
- Material:RDHALDN
- Model:RDHA-LDN
- Summary:Cartridge
Quantity in stock: 0
***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 RDHALDN (RDHALDN) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens to tank port 2 when the inlet port 1 reaches the set pressure, effectively throttling flow to control pressure rise. Known for its smooth and quiet operation, the RDHALDN is essentially zero leak, dirt tolerant, and immune to silting with a rapid response time of approximately 2 milliseconds. It offers physical and functional interchangeability with other 2-port relief cartridges for a given frame size, making it versatile in application. The valve can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of up to 100 gpm (380 L/min). It is suitable for cross-port relief circuits as it accepts maximum pressure at port 2. The valve's adjust screw seals are exposed to system pressure, requiring adjustments only when the system is depressurized. For optimal performance and repeatability, select a spring range where the desired relief setting falls between midrange and high within the specified limits. The RDHALDN is particularly effective in load-holding applications due to its insensitivity to varying oil temperatures and contamination. Backpressure on port 2 directly adds to the valve setting at a ratio of 1:1. Its floating style construction minimizes risks of internal binding due to installation torque or machining variations. Installation specifics include a cavity size T-16A/S3 with recommended installation torque between 150-160 lbf ft (203-217 Nm). The adjustment screw requires an internal hex size of 5/32 inches (4 mm), with locknut torque specifications ranging from 80-90 lbf in (9-10 Nm). The model weighs approximately 1.30 lb (0.60 kg), and Viton seal kits are available under part number 990316006 for maintenance needs.
The Sun Hydraulics RDHALDN (RDHALDN) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens to tank port 2 when the inlet port 1 reaches the set pressure, effectively throttling flow to control pressure rise. Known for its smooth and quiet operation, the RDHALDN is essentially zero leak, dirt tolerant, and immune to silting with a rapid response time of approximately 2 milliseconds. It offers physical and functional interchangeability with other 2-port relief cartridges for a given frame size, making it versatile in application. The valve can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of up to 100 gpm (380 L/min). It is suitable for cross-port relief circuits as it accepts maximum pressure at port 2. The valve's adjust screw seals are exposed to system pressure, requiring adjustments only when the system is depressurized. For optimal performance and repeatability, select a spring range where the desired relief setting falls between midrange and high within the specified limits. The RDHALDN is particularly effective in load-holding applications due to its insensitivity to varying oil temperatures and contamination. Backpressure on port 2 directly adds to the valve setting at a ratio of 1:1. Its floating style construction minimizes risks of internal binding due to installation torque or machining variations. Installation specifics include a cavity size T-16A/S3 with recommended installation torque between 150-160 lbf ft (203-217 Nm). The adjustment screw requires an internal hex size of 5/32 inches (4 mm), with locknut torque specifications ranging from 80-90 lbf in (9-10 Nm). The model weighs approximately 1.30 lb (0.60 kg), and Viton seal kits are available under part number 990316006 for maintenance needs.
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.
- 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-16A |
| Series | 3 |
| Capacity | 100 gpm380 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 | 1 1/4 in.31,8 mm |
| Valve Installation Torque | 150 - 160 lbf ft203 - 217 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 | 1.30 lb0,60 kg |
| Seal kit - Cartridge | Viton: 990-316-006 |
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Notes:
- U.S. Patent #4,742,846; European Patent Pending