SUN HYDRAULICS
RSFSKNN

***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 RSFSKNN (RSFSKNN) is a pilot-operated, balanced poppet sequence valve designed to supply a secondary circuit with flow once the inlet port pressure exceeds the valve setting. This valve controls the pressure at port 1 relative to the drain port 3 and is unaffected by back pressure at port 2 up to the valve setting. It can regulate pressure in place of two-port relief valves if there is return line pressure. All three-port sequence cartridges are interchangeable, maintaining consistent flow paths and cavity sizes for specific frame sizes. As inlet pressure at port 1 rises above the valve setting, pilot flow increases. The main stage orifice features a 150-micron stainless steel screen for protection. The pressure at port 3 adds directly to the valve setting in a 1:1 ratio, with a maximum limit of 5000 psi (350 bar). Suitable for load-holding applications, these valves are immune to cavitation issues such as noise and manifold erosion due to internal modulating within the cartridge. They can handle maximum pressure at port 2 and are suitable for cross-port relief circuits. The Sun floating style construction minimizes internal part binding risks due to excessive installation torque or machining variations in cavities/cartridges. The RSFSKNN model features a T-2A cavity, Series 2 capacity of 30 gpm (120 L/min), and factory-set pressures established at 4 gpm (15 L/min). It operates at a maximum pressure of 5000 psi (350 bar) with a typical response time of 10 ms and minimal leakage upon reseat. Adjustments are made via clockwise turns with specific hex sizes for screws and locknuts, ensuring secure installation torque requirements are met. This model weighs .50 lb (.25 kg) and includes Viton seal kits for enhanced durability.