SUN HYDRAULICS
RELIEF CART
RBACKAN

***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 RBACKAN (Material Number: RBACKAN) is a direct-acting, pilot relief cartridge designed to remotely control the pressure setting of other pilot-operated valves. This specific cartridge is suitable for systems using phosphate ester fluids, as it is configured with EPDM seals that can be damaged by petroleum-based fluids. It features a main stage orifice protected by a 150-micron stainless steel screen, making it ideal for load-holding applications. The valve's back pressure on the tank port is directly additive to the valve setting at a 1:1 ratio. The RBACKAN model incorporates Sun's floating style construction, minimizing internal part binding due to excessive installation torque or cavity/cartridge machining variations. It has a capacity of 0.25 gpm (1 L/min) and can operate at a maximum pressure of 5000 psi (350 bar), with a typical response time of 2 ms and maximum valve leakage at 110 SUS (24 cSt) of 5 drops/min (0.3 cc/min). The valve is adjustable throughout its full range using W or Y controls unless specified otherwise for special settings. Installation requires specific torques, with the valve hex size being 7/8 in. (22.2 mm) and installation torque ranging from 30 to 35 lbf ft (41 to 47 Nm). The adjustment screw has an internal hex size of 5/32 in. (4 mm), while the locknut hex size is 9/16 in. (15 mm), requiring a torque between 80 to 90 lbf in. (9 to 10 Nm). Weighing approximately .30 lb (.15 kg), this cartridge also comes with an optional Viton seal kit under part number 990010006 for added versatility and compatibility with various system requirements.