SUN HYDRAULICS
RSFSKQN

***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 RSFSKQN (RSFSKQN) is a pilot-operated, balanced poppet sequence valve designed to manage secondary circuit flow once the inlet port pressure surpasses the valve's preset level. This valve effectively controls pressure at port 1 relative to the drain port 3 pressure, remaining unaffected by back pressure at port 2 up to the set threshold. Functionally interchangeable with all 3-port sequence cartridges of similar frame size, it offers versatility in hydraulic systems. The valve incorporates a main stage orifice shielded by a 150-micron stainless steel screen and supports maximum pressures up to 5000 psi (350 bar). It is ideal for load-holding applications due to its internal modulation that mitigates cavitation-related issues like noise and manifold erosion. The RSFSKQN can handle maximum pressure at port 2, making it suitable for cross-port relief circuits. Its floating style construction minimizes binding risks from excessive installation torque or machining variations. This model has a capacity of 30 gpm (120 L/min), with factory pressure settings established at 4 gpm (15 L/min). The response time is typically around 10 ms, and maximum leakage upon reseat is minimal at approximately ten drops per minute (0.7 cc/min). Installation requires specific torque settings: valve hex size is 1-1/8 inches with an installation torque of 45-50 lbf-ft (61-68 Nm), and adjustment screw internal hex size is 5/32 inches. The locknut hex size measures at 9/16 inches with a torque requirement of 80-90 lbf-in (9-10 Nm). Weighing .50 lb (.25 kg), it comes equipped with Viton seals for reliable performance in demanding environments.