SUN HYDRAULICS
RDBALDE

$237.78 USD

SUN HYDRAULICS
Material:RDBALDE
Model:RDBA-LDE
Summary:Cartridge

Quantity in stock: 0

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***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 RDBALDE (RDBALDE) is a direct-acting relief cartridge designed to function as a pressure-limiting valve, safeguarding hydraulic components from pressure transients. This normally closed valve opens when the inlet port 1 pressure reaches the set limit, directing flow to the tank port 2 to regulate pressure rise. Known for its smooth, quiet operation and essentially zero leakage, this valve is dirt-tolerant and immune to silting, offering rapid response times. It can handle maximum pressure at port 2 and is suitable for cross-port relief circuits and load-holding applications. The valve's adjustment process requires system pressure removal due to its design, which exposes adjust screw seals to system pressure. To ensure optimal performance, select a spring range where the relief setting is midrange to high between the minimum and maximum pressures. The valve incorporates Sun's floating style construction, minimizing internal binding risks due to installation torque or machining variations. The RDBALDE model features a T-162A cavity with a series 0 capacity of 12 gpm (45 L/min) and operates at a maximum pressure of 5000 psi (350 bar). It has an average response time of 2 ms and allows a maximum leakage of 10 drops/minute upon reseat at 85% of the setting. Adjustment involves up to five clockwise turns with an internal hex size of 5/32 inch (4 mm), while installation requires a torque of 20 \u2013 25 lbf ft (27 \u2013 33 Nm). The valve weighs approximately .20 lb (.10 kg) and can be configured with EPDM seals for use in systems containing phosphate ester fluids; however, exposure to petroleum-based fluids should be avoided as it could damage these seals.

Description

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-162A
Series	0
Capacity	12 gpm45 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	>85% of setting>85% of setting
Adjustment - Number of Clockwise Turns to Increase Setting	55
Valve Hex Size	3/4 in.19,1 mm
Valve Installation Torque	20 - 25 lbf ft27 - 33 Nm
Adjustment Screw Internal Hex Size	5/32 in.4 mm
Locknut Hex Size	1/2 in.12,7 mm
Locknut Torque	80 - 90 lbf in.9 - 10 Nm
Model Weight	.20 lb0,10 kg
Seal kit - Cartridge	Viton: 990-162-006

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Additional Resources

Notes:

U.S. Patent #4,742,846; European Patent Pending

What are the tolerances on pressure settings for Sun's pressure control valves?	Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Can I use a kick-down relief for my system relief?	Maybe not. We build in a good amount of overlap in the kick-down reliefs to prevent false tripping. This means they are not as fast as our standard pilot-operated reliefs. A direct-acting relief valve set just above the kick-down relief valve would be good insurance.
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.
Where would I use a kick-down relief?	One graphic example is on a portable grain auger for silos. When the farmer gets caught in the auger the kick-down relief trips and allows him to escape.

SUN HYDRAULICSRDBALDE

Additional Resources

SUN HYDRAULICS
RDBALDE