SUN HYDRAULICS
RDDTQWN

$180.09 USD

SUN HYDRAULICS
Material:RDDTQWN
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 RDDTQWN (RDDTQWN) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients by limiting excess operating pressure. This normally closed, pressure-limiting valve opens to the tank port when the inlet port pressure reaches the preset level, ensuring smooth and quiet operation with nearly zero leakage. It is dirt tolerant, immune to silting, and reacts quickly with a typical response time of 2 ms. The CE-marked valve complies with the European Directive for Pressurized Devices PED 97/23/EC, making it suitable for safety applications requiring robust pressure control. The RDDTQWN offers standard adjustment ranges of 100 bar to 330 bar and can accommodate additional settings upon request. It accepts maximum pressure at port 2 and is suitable for cross-port relief circuits and load holding applications. The valve's design incorporates Sun's floating style construction, minimizing the risk of internal parts binding due to excessive installation torque or machining variations. It features a capacity of 19.8 gpm (75 L/min) and maintains stability even with varying oil temperatures and contamination levels. Additional specifications include a cavity type T-10A Series 1, maximum valve leakage at reseat of 10 drops/min (0.7 cc/min), and reseat at 90% of setting. The valve has a hex size of 7/8 in. (22.2 mm) and requires an installation torque between 30-35 lbf ft (41-47 Nm). The adjustment screw has an internal hex size of 5/32 in. (4 mm), while the locknut has a hex size of 9/16 in. (15 mm) with a torque requirement of 80-90 lbf in. (9-10 Nm). The model weighs approximately .30 lb (.15 kg), and it is compatible with Viton seal kits, specifically part number 990310006.

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. The CE marked valve is a safety valve that meets the requirements of the European Directive for Pressurized Devices (PED) 97/23/EC. The valve setting represents the excess operating pressure at which the valve opens. Valve capacity can be determined from the performance curve. It shows an approved flow which depends on the excess operating pressure. As a requirement of the PED, the system pressure at the maximum approved flow is a maximum of 10% above the excess operating pressure.

Standard settings for preset valves include:
- A adjustment range: 100 bar, 140 bar, 160 bar and 210 bar
- W adjustment range: 250 bar
- C adjustment range: 330 bar
Other settings are available upon request.
At this time RDDT and RDFT are the only Sun relief valves that are CE marked.
Each delivery contains a TÜV-Approval, which is a certification of the excess operating pressure and the approved flow, an EC Declaration of conformity and an instructional manual.
Pressure settings from 90 bar up to 422 bar are approved and certified by TÜV
Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
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-10A
Series	1
Capacity	19.8 gpm75 L/min.
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	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: 990-310-006

Show FAQ

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.
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.

SUN HYDRAULICSRDDTQWN

Additional Resources

SUN HYDRAULICS
RDDTQWN