SUN HYDRAULICS
RBANXAV4F12V

$455.10 USD

SUN HYDRAULICS
Material:RBANXAV4F12V
Model:RBAN-XAV@4F12V
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 RBANXAV4F12V (RBANXAV4F12V) is a 2-port, pilot-stage, direct-acting relief cartridge designed for precise pressure regulation. This electroproportionally controlled valve is normally closed and spring-biased to the highest customer-specified setting. By increasing the current to the coil, the pressure setting can be proportionally decreased. The valve operates by lifting the poppet to allow flow from port 1 to port 2 when the inlet pressure at port 1 exceeds the combined spring and solenoid force, as determined by an analog input signal. The RBANXAV4F12V utilizes a T8A cavity, making it compatible with Sun's main stage pressure control elements, eliminating the need for separate pilot lines. Customers must specify a relief setting within their selected pressure range, which represents the maximum default relief pressure without command input. As command increases, this relief setting decreases steplessly via varying analog input signals. The valve's high pilot capacity supports larger main stage elements with stable operation across diverse conditions due to its damped construction. It features low leakage levels in its closed position with reseat occurring at 85% of cracking pressure. For optimal performance, an amplifier with current sensing and adjustable dither (100-250 Hz) is recommended. The RBANXAV4F12V incorporates Sun's floating style construction to prevent internal part binding due to installation torque or machining variations. It supports interchangeable coils with other Sun solenoid-operated valves and offers flexibility in installation direction on the solenoid tube. Specifications include a maximum operating pressure of 5000 psi (350 bar), a capacity of 0.25 gpm (1 L/min), and a valve hex size of 7/8 inches (22.2 mm). The model weighs approximately 1 lb (0.45 kg) with coil and requires specific torque values for installation: 20-25 lbf ft (27-33 Nm). Seal kits are available in Viton material for both cartridge and coil components.

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 HYDRAULICSRBANXAV4F12V

Additional Resources

SUN HYDRAULICS
RBANXAV4F12V