SUN HYDRAULICS CORP
RBAPEWN4A12V
Electro-Proportional

This 2-port, pilot-stage, direct-acting relief cartridge is an electro-proportionally controlled, pressure regulating valve. The proportional control allows for infinite, step-less adjustability within the selected pressure range. When the pressure at port 1 (inlet) is sufficient to overcome the solenoid forces, 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.

• 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.
• All pressure ranges will drop to a setting of 0 with no analog input signal. The pressure ranges indicate the valve's area of acceptable performance.
• The L control (Manual Override - Adjustable) allows one to manually adjust the valve in case of an electrical failure. The L control also allows one to offset the pressure range. For instance, if an A range valve is mechanically offset to a setting of 1500 psi (105 bar), the new maximum will be 4500 psi (310 bar).
• The 'E' manual control assembly has a mechanical life expectancy of approximately 7,000 cycles.
• Damped construction provides stable operation over a wide range of operating conditions. Note: Models equipped with an 'M' control do not incorporate the dampening orifice in the solenoid armature.
• The momentary/twist override option "E" allows the operator to shift the valve by twisting the manual override clockwise 90 degrees.
• Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
• Capable of operating with pressures up to 5000 psi.
• 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: There is no upper limit to the pressure setting when using the M control. The more force you exert on the manual override, the higher the resulting pressure.
• High pilot capacity allows for operation of larger size main stage elements.
• 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.

Additional Resources

• Configure Your Bluetooth Embedded Amplifier with AmpSet Blue™
• Sun Introduces 'Hybrid' Valves
• Tri-Grip Handknob Now Offered From Sun as a Standard Control Option
• Sun Expands Corrosion-Resistant Solutions
• CavitySaver multi-function valves deliver single-cartridge solutions
• Electro-Proportional Basics Explained
• CE/TÜV Certified Pressure Relief Valves
• Weatherized Solenoid Valves for Harsh Environments
• QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
• Pressure Relief and Regulating Cartridge Valve Technical Tips
• Pilot Operated, Balanced Poppet Relief Valves
• Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
• Sun Offers Zinc-Nickel Plating for Corrosion Resistance
• Sun Cartridges with EPDM Seals
• 'Soft' Relief Eliminates Pressure Spikes
• Pilot-Operated, Balanced Poppet, Anti Shock Reliefs
• Proportional Amplifiers and Ancillary Products
• Manufacturing Sun Cartridge Cavities
• Solenoid Coils for Switching and Proportional Valves
• Pressure Relief and Regulating Valves
• Electro-Proportional Cartridge Valves
• Cartridges: Materials of Construction
• Cavity Information (S-171) and Tooling
• Sun's Floating Style Screw-In Cartridge
• Fluid and Temperature Recommendations
• Performance Data
• Sun Model Code Explanation; 999-901-334
• Units of Measure, Settings, and Conversions
• Electro-Proportional Terms and Definitions

• Please verify cartridge clearance requirements when choosing a Sun manifold. Different valve controls and coils require different clearances.