SUN HYDRAULICS
RPKSKQN

***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 RPKSKQN (RPKSKQN) is a pilot-operated, balanced poppet relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve begins to open at tank port 2 when the inlet port 1 pressure reaches the pre-set level, effectively throttling flow to maintain consistent pressure. Known for its accuracy, smooth operation, and rapid response time of approximately 7 ms, this valve offers low pressure rise against flow. The internal cartridge modulation makes it resistant to cavitation-related issues such as noise and manifold erosion. It can handle maximum pressure at port 2 and is suitable for cross-port relief circuits. The valve's performance remains stable despite fluctuations in oil temperature or contamination levels, thanks to its robust design which includes a 150-micron stainless steel screen protecting the main stage orifice. This model allows back pressure on tank port 2 to be directly additive to the valve setting at a 1:1 ratio. It features adjustable settings with W and Y controls for full-range adjustment unless a specific setting is predetermined as the maximum. Corrosion-resistant options are available with external stainless steel or zinc-nickel plating indicated by suffixes AP or LH in the model code. Its floating style construction minimizes binding risks due to installation torque or machining variations. The RPKSKQN fits into a Cavity T-18A Series 4 with a capacity of up to 200 gpm (760 L/min) and operates under a maximum pressure of 5000 psi (350 bar). Other specifications include a factory pressure setting established at 4 gpm (15 L/min), maximum valve leakage at reseat of 10 drops/min (0.7 cc/min), and various hex sizes for installation and adjustment purposes. The model weighs approximately 2.50 lb (1.15 kg) and uses Viton seal kits like part number 990318006 for maintenance needs.