SUN HYDRAULICS
RSBCKNN

***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 RSBCKNN (RSBCKNN) is a pilot-operated, balanced piston sequence valve designed to manage flow to a secondary circuit once the inlet port 1 pressure surpasses the valve setting. This valve efficiently controls the pressure at port 1 relative to the drain port 3 and remains unaffected by back pressure at port 2, up to its set limit. It can replace two-port relief valves in systems with return line pressure. All three-port sequence cartridges share physical and functional interchangeability, ensuring compatibility in flow paths and cavity dimensions for a given frame size. The pilot flow increases as inlet pressure at port 1 rises above the set threshold relative to drain port 3, with a main stage orifice shielded by a durable 150-micron stainless steel screen. The minimum setting is established at 75 psi (5 bar) across all spring ranges, with an additive pressure limit at port 3 not exceeding 5000 psi (350 bar). However, it is unsuitable for load holding due to spool leakage. Cartridges using EPDM seals are compatible with phosphate ester fluids but are vulnerable to petroleum-based substances. Sun's floating style construction minimizes risks of internal binding from excessive installation torque or machining variations. The valve's specifications include a T-163A cavity, series 0 capacity of 7.5 gpm (30 L/min), factory pressure settings set at 4 gpm (15 L/min), and a maximum operating pressure of 5000 psi (350 bar). It features a typical response time of approximately 10 ms and maximum leakage of about 2 in\u00b3/min (30 cc/min) at viscosities of 110 SUS (24 cSt). The adjustment mechanism allows for five clockwise turns to increase settings, with specific torque requirements for both installation and locknut adjustments ensuring secure placement and operation.