SUN HYDRAULICS
RSFCFEN

***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 RSFCFEN (RSFCFEN) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the pressure at inlet port 1 exceeds the valve setting. This sequence valve controls the pressure at port 1 relative to the pressure at drain port 3 and remains unaffected by back pressure at port 2 up to the valve setting. It can substitute for two-port relief valves when there is pressure in the return line. All three-port sequence cartridges are interchangeable, offering a consistent flow path and cavity size for a given frame size. The valve features a main stage orifice protected by a 150-micron stainless steel screen and allows for pilot flow increases as inlet pressure rises above the set point. The maximum allowable pressure at port 3 is additive to the valve setting on a 1:1 ratio, not exceeding 5000 psi (350 bar). Due to spool leakage, it is unsuitable for load-holding applications. The RSFCFEN model incorporates Sun's floating style construction, reducing internal part binding risks due to installation torque or machining variations. It accommodates EPDM seals specifically for systems using phosphate ester fluids; exposure to petroleum-based substances will damage these seals. The cartridge offers adjustable settings via W or Y controls, with or without special settings that define maximum adjustments. Additional specifications include a response time of approximately 10 ms, maximum operating pressure of 5000 psi (350 bar), and capacity of up to 30 gpm (120 L/min). Installation requires specific torque values: valve installation torque between 45-50 lbf ft (61-68 Nm), locknut torque between 80-90 lbf in (9-10 Nm), with respective hex sizes for adjustment screw and locknut being ^5\u204432 in. (4 mm) and ^9\u204416 in. (15 mm). The model weighs .50 lb (.25 kg) and comes with Viton seal kit option number 990202006.