SUN HYDRAULICS
RPIEQDN

$197.17 USD

SUN HYDRAULICS
Material:RPIEQDN
Model:RPIE-QDN
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 RPIEQDN (RPIEQDN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens rapidly to tank port 2 when the inlet port 1 pressure reaches the set threshold, effectively throttling flow to limit pressure rise. Notable for its low-pressure rise versus flow and quick response time, this valve is ideal for applications where rapid opening and closing are prioritized over smoothness. It features physical and functional interchangeability across all 2-port relief cartridges except pilot reliefs, maintaining the same flow path and cavity for a given frame size. The RPIEQDN can handle maximum pressure at port 2, making it suitable for cross-port relief circuits; however, spool leakage should be considered in such configurations. The main stage orifice is protected by a 150-micron stainless steel screen. This valve is not recommended for load-holding applications due to potential spool leakage. Back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. The Sun floating style construction minimizes internal part binding risks due to excessive installation torque or cavity/cartridge machining variations. Technical specifications include a T-16A cavity series with a capacity of 100 gpm (380 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum valve leakage at 110 SUS (24 cSt) of 4 in/min (65 cc/min). The adjustment mechanism allows up to five clockwise turns to increase settings, with specific torque requirements for installation and locknut adjustments. The model weighs approximately 1.20 lb (0.55 kg) and utilizes Viton seal kits (990016006).

Description

Fast-acting, pilot-operated, balanced piston relief cartridges are normally closed, pressure-limiting valves used to protect hydraulics components from pressure transients. Fast opening and closing is gained at the expense of smoothness. 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 have low pressure rise vs. flow 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. If used in cross port relief circuits, consider spool leakage.
Main stage orifice is protected by a 150 micron stainless steel screen.
Not suitable for use in load holding applications due to spool leakage.
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 110 SUS (24 cSt)	4 in³/min.@1000 psi65 cc/min.@70 bar
Adjustment - Number of Clockwise Turns to Increase Setting	55
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	1.20 lb0,55 kg
Seal kit - Cartridge	Viton: 990-016-006

Show FAQ

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.
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.

SUN HYDRAULICSRPIEQDN

Additional Resources

SUN HYDRAULICS
RPIEQDN