SUN HYDRAULICS
RSFCWDN

***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 RSFCWDN (RSFCWDN) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the pressure at the inlet port has exceeded the valve setting. This valve controls the pressure at port 1 relative to the pressure at the drain port 3 and is insensitive to back pressure at port 2 up to its setting. It can be used as a substitute for two-port relief valves when there is pressure in the return line, but it is not suitable for load holding applications due to spool leakage. The valve features interchangeable three-port sequence cartridges, allowing for consistent flow paths and cavity compatibility within a given frame size. With a maximum operating pressure of 5000 psi (350 bar) and a capacity of 30 gpm (120 L/min), this valve incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or machining variations. The main stage orifice is protected by a 150-micron stainless steel screen, ensuring durability and reliability. The RSFCWDN model provides adjustable settings through W or Y controls and offers configurations with EPDM seals for systems using phosphate ester fluids, though these seals are incompatible with petroleum-based fluids. The valve's response time is typically around 10 ms, with control pilot flow ranging from 10-15 in\u00b3/min (0.16-0.25 L/min). It has an adjustment range requiring approximately five clockwise turns to increase settings and features specific installation torque requirements: valve hex size of 1-1/8 inches (28.6 mm) with installation torque between 45-50 lbf ft (61-68 Nm), an adjustment screw internal hex size of 5/32 inches (4 mm), and locknut torque of 80-90 lbf in (9-10 Nm). The RSFCWDN model weighs approximately .50 lb (.25 kg) and uses Viton seal kit number 990202006 for maintenance or replacement needs.