SUN HYDRAULICS
RSFCLNN

***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 RSFCLNN (RSFCLNN) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the inlet port 1 pressure exceeds the valve setting. This valve controls pressure at port 1 relative to the drain port 3 and remains unaffected by back pressure at port 2 up to the valve setting. It can substitute for 2-port relief valves in situations where there is pressure in the return line. The RSFCLNN model features interchangeable three-port sequence cartridges, ensuring compatibility in terms of flow path and cavity for a given frame size. As inlet pressure at port 1 rises above the valve setting relative to drain pressure at port 3, pilot flow increases. The main stage orifice is safeguarded by a 150-micron stainless steel screen, while pressure at port 3 directly adds to the valve setting at a ratio of 1:1, with a maximum limit of 5000 psi (350 bar). This model is unsuitable for load-holding applications due to spool leakage but offers adjustable settings via W and Y controls unless specified otherwise. Cartridges with EPDM seals are intended for phosphate ester fluid systems and should avoid petroleum-based fluids. The Sun floating style construction minimizes internal part binding risks due to excessive installation torque or machining variations. Additional specifications include a T-2A cavity series, capacity of 30 gpm (120 L/min), factory pressure settings established at 4 gpm (15 L/min), maximum operating pressure of 5000 psi (350 bar), control pilot flow between 10-15 in\u00b3/min (0.16-0.25 L/min), typical response time of about 10 ms, and maximum valve leakage at specified conditions of approximately 3 in\u00b3/min (50 cc/min). The adjustment screw requires an internal hex size of 5/32 inches (4 mm) with locknut torque set between 80-90 lbf-in (9-10 Nm).