SUN HYDRAULICS
RDDTQCN

$183.07 USD

SUN HYDRAULICS
Material:RDDTQCN
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 RDDTQCN (RDDTQCN) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens to the tank port when the inlet port pressure reaches the set threshold, effectively throttling flow to control pressure rise. Notable for its smooth and quiet operation, this valve is essentially zero leak and dirt tolerant, making it immune to silting while providing rapid response times. The RDDTQCN model is CE marked, complying with the European Directive for Pressurized Devices PED 97/23/EC, ensuring safety standards are met. It features a range of standard preset adjustments from 100 bar to 330 bar and can accommodate custom settings upon request. The valve's construction minimizes internal part binding due to excessive installation torque or cavity machining variations. Certified by T\u00dcV for pressures from 90 bar up to 422 bar, it includes necessary documentation such as a T\u00dcV Approval certification and an EC Declaration of Conformity with each delivery. The RDDTQCN is suitable for use in cross-port relief circuits due to its ability to accept maximum pressure at port 2. It's also ideal for load-holding applications since it remains relatively insensitive to varying oil temperatures and contamination levels. The back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio, enhancing its versatility in various hydraulic systems. With a capacity of 19.8 gpm (75 L/min) and a typical response time of just 2 ms, this valve ensures efficient performance under demanding conditions. It features an adjustment screw with an internal hex size of 5/32 inches and requires specific installation torques for optimal functionality. The model weighs approximately .30 lb (0.15 kg) and comes equipped with Viton seals as part of the cartridge seal kit (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 HYDRAULICSRDDTQCN

Additional Resources

SUN HYDRAULICS
RDDTQCN