SUN HYDRAULICS
RSFSLQN

***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 RSFSLQN (RSFSLQN) is a pilot-operated, balanced poppet sequence valve designed to manage the flow to a secondary circuit once the pressure at inlet port 1 exceeds the pre-set valve threshold. It effectively controls the pressure at port 1 relative to the drain port 3 and remains unaffected by back pressure at port 2 up to the valve's set point. This versatility allows it to regulate pressure in place of traditional two-port relief valves when there is return line pressure. The RSFSLQN model boasts interchangeability with other three-port sequence cartridges of similar frame sizes, ensuring compatibility in terms of flow path and cavity dimensions. The valve's pilot flow increases as inlet pressure rises above the set value relative to drain pressure, with its main stage orifice safeguarded by a 150-micron stainless steel screen. The design ensures that pressure at port 3 directly adds to the valve setting at a 1:1 ratio, maintaining an upper limit of 5000 psi (350 bar). Suitable for load-holding applications, it mitigates common cavitation issues like noise and manifold erosion due to internal modulation within the cartridge. The RSFSLQN can handle maximum pressures at port 2, making it ideal for cross-port relief circuits. Its floating style construction minimizes risks associated with internal part binding from excessive torque or machining variations during installation. With a capacity of 30 gpm (120 L/min) and factory settings established at 4 gpm (15 L/min), this model supports efficient operation under high pressures with minimal leakage. The valve features easy adjustment capabilities, including a locknut for secure settings and requires specific torque values for installation and adjustments. The unit weighs .50 lb (.25 kg) and comes with Viton seal kits for enhanced durability in demanding environments.