SUN HYDRAULICS
RBANXBN812N

$226.96 USD

SUN HYDRAULICS
Material:RBANXBN812N
Model:RBAN-XBN@812N
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 RBANXBN812N (RBANXBN812N) is a 2-port, pilot-stage, direct-acting relief cartridge designed to function as an electroproportionally controlled, normally closed pressure regulating valve. It is engineered to be spring-biased closed to the highest customer-specified setting, with increasing current to the coil proportionally decreasing the pressure setting. This valve operates by allowing flow from port 1 to port 2 when the pressure at port 1 overcomes both the spring force and solenoid force. It utilizes the T8A cavity, making it compatible with Sun's main stage pressure control elements. The valve requires a specified relief setting within a selected pressure range, which represents the maximum default relief pressure with no command input. Adjustments in analog input signal enable stepless control of pressure. The RBANXBN812N is characterized by its high pilot capacity suitable for larger main stage elements and damped construction for stable operation across varied conditions. It exhibits low leakage levels when closed and features interchangeable coils that can be mounted in either direction on the tube. For optimal performance, it is recommended to use an amplifier with current sensing and adjustable dither between 100-250 Hz. The installation involves first securing the main stage valve followed by attaching the T8A pilot control section. Key specifications include a maximum operating pressure of 5000 psi (350 bar), a reseat occurring at 85% of cracking pressure, and a maximum valve leakage at reseat of 1.5 in\u00b3/min (25 cc/min). The RBANXBN812N incorporates Sun's floating style construction to reduce potential binding due to excessive torque or machining variations. With a model weight of approximately 1 lb (0.45 kg) including the coil, this cartridge is equipped with Viton seals for enhanced durability and reliability in various applications.

Description

This 2-port, pilot-stage, direct-acting relief cartridge is an electro-proportionally controlled, normally-closed pressure regulating valve. The valve is spring biased closed to its highest setting (customer specified). Increasing current to the coil will proportionally decrease the pressure setting. When the pressure at port 1 (inlet) is sufficient to overcome the spring force minus the solenoid force, as determined by the analog input signal, the poppet lifts and allows flow from port 1 to port 2 (outlet). This pilot control cartridge utilizes the T-8A cavity so it can be used in conjunction with Sun's main stage, pressure control elements.

Customer must specify a relief setting that falls within the selected pressure range. This setting represents the maximum relief pressure which the valve will default to with no command. As the command increases, the relief setting will decrease. See performance curves for selected pressure range. This setting is not adjustable in the field.
Varying the analog input signal to the proportional solenoid provides a step-less control of pressure.
This electro-proportional cartridge utilizes the Sun T-8A, 2-port cavity making it the ideal choice to use in conjunction with Sun's main stage 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-port pilot stage control cartridges utilize the same cavity and are physically interchangeable. Functionality is the only consideration.
High pilot capacity allows for operation of larger size main stage elements.
Damped construction provides stable operation over a wide range of operating conditions.
Low leakage levels in the closed position. (Reseat occurs at 85% of cracking pressure.)
Coils are interchangeable with Sun's other full flow, solenoid operated valves and can be mounted on the tube in either direction.
For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
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.
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	.25 gpm1 L/min.
Maximum Operating Pressure	5000 psi350 bar
Maximum Valve Leakage at Reseat	1.5 in³/min.25 cc/min.
Reseat	>85% of setting>85% of setting
Solenoid Tube Diameter	.75 in.19 mm
Valve Hex Size	7/8 in.22,2 mm
Valve Installation Torque	20 - 25 lbf ft27 - 33 Nm
Model Weight (with coil)	1.00 lb0,45 kg
Seal kit - Cartridge	Viton: 990-208-006
Seal and nut kit - Coil	Viton: 990-770-006Viton: 990-770-006

Show FAQ

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.
How do I get a kick-down relief to reset?	The kick-down relief acts much like a circuit breaker. When the pressure at the inlet (port 1) of the relief valve rises to the setting, the valve pops open and drops the pressure down to 100 psi or so. The valve stays open until flow through it stops. Shutting off the supply of oil will reset the valve; reversing pressure on the valve is a positive way of resetting it.
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.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
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.

SUN HYDRAULICSRBANXBN812N

Additional Resources

SUN HYDRAULICS
RBANXBN812N