SUN HYDRAULICS
RBARDWN

$142.47 USD

SUN HYDRAULICS
Material:RBARDWN
Model:RBAR-DWN
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 RBARDWN (RBARDWN) is a two-port, pilot-stage, air-controlled, direct-acting relief cartridge designed for pressure regulating applications. These cartridges remain normally closed and open a flow path from port 1 to port 2 when the inlet pressure at port 1 surpasses the air signal force. The RBARDWN model is specifically tailored for pilot flow applications and fits Sun's T8A cavity, making it compatible with Sun's pilot-operated mainstage valves. This design eliminates the need for separate pilot lines and requires only one cavity to accommodate both control and primary functions. It features hardened poppet and seat components that ensure consistent operation, low leakage rates, and exceptional wear characteristics. The RBARDWN cartridge can handle ports 1 and 2 pressured up to 5000 psi (350 bar) and offers oil-to-air pilot ratios of either 50:1 or 75:1. It incorporates Sun's floating style construction to reduce the risk of internal part binding due to excessive installation torque or machining variations. The maximum valve leakage at 110 SUS (24 cSt) is limited to 15 drops/min (1 cc/min), while the maximum pilot control port pressure is capped at 150 psi (10.5 bar). Furthermore, backpressure at port 2 increases the relief setting by a multiplier of .43. This cartridge is ideal for systems requiring efficient pressure regulation without separate pilot lines, offering robust performance in various hydraulic applications where precise control is essential. The valve installation torque ranges between 20 - 25 lbf ft (27 - 33 Nm), ensuring secure fitting within its designated cavity. Seal kits are available in Viton material under part number 990608006 for maintenance needs.

Description

Two-port, pilot-stage, air-controlled, direct-acting relief cartridges are normally closed pressure regulating valves. When the pressure at port 1 (inlet) is sufficient to overcome the force due to the air signal, a flow path is opened from port 1 to port 2 (tank). These cartridges are designed for pilot flow applications and utilize Sun's T-8A cavity so they can be used in conjunction with Sun's pilot-operated, main-stage valves.

Utilizes the Sun T-8A 2-port cavity making it the ideal choice to use in conjunction with Sun's main stage pilot or vent-to-operate cartridges. Separate pilot lines are eliminated and only one cavity needs to be machined to accommodate both the control and primary function. Note: All 2-position, 2-way pilot stage control cartridges utilize the same cavity and are physically interchangeable. Functionality is the only consideration.
Note: The main stage valve should first be installed to the correct torque value followed by the T-8A pilot control section into the main stage valve to its required torque value.
Different pilot control port options are available. See Option Selection for details.
Ports 1 and 2 may be pressured to 5000 psi (350 bar).
Hardened poppet and seat provide consistent operation, low leakage rates and superior wear characteristics.
Two different oil-to-air pilot ratios are available; 50:1 and 75:1. See Option Selection.
Maximum pilot control port pressure is 200 psi (14 bar).
Backpressure at port 2 increases the relief setting by a .43 multiplier.
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-8A
Series	P
Capacity	2.5 gpm10 L/min.
Maximum Operating Pressure	5000 psi350 bar
Maximum Valve Leakage at 110 SUS (24 cSt)	15 drops/min.1 cc/min.
Maximum Pilot Pressure	150 psi10,5 bar
Pilot Control Port	See Control OptionsSee Control Options
Valve Installation Torque	20 - 25 lbf ft27 - 33 Nm
Seal kit - Cartridge	Viton: 990-608-006

Show FAQ

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 HYDRAULICSRBARDWN

Additional Resources

SUN HYDRAULICS
RBARDWN