SUN HYDRAULICS
RPKSCNN

***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 RPKSCNN (RPKSCNN) is a pilot-operated, balanced poppet relief cartridge valve designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to the tank port when the inlet pressure reaches the set point, effectively throttling flow to maintain desired pressure levels. Known for its accuracy, smooth operation, and low noise, it is immune to cavitation issues such as noise and manifold erosion. The valve can handle maximum pressure at port 2 and is suitable for cross port relief circuits. It remains stable despite variations in oil temperature and contamination due to its protected main stage orifice with a 150-micron stainless steel screen. Back pressure on the tank port directly adds to the valve setting at a 1:1 ratio. The RPKSCNN model features corrosion-resistant options with external stainless steel or zinc-nickel plated components and incorporates floating style construction to prevent internal binding from installation torque or machining variations. With a capacity of 200 gpm (760 L/min) and a maximum operating pressure of 5000 psi (350 bar), it offers rapid response times of approximately 7 ms and minimal leakage upon reseat. The valve's design allows for adjustment throughout its range using W or Y controls, with special settings available upon request. Installation requires specific torque settings, with detailed specifications provided for hex sizes and locknut torque. This cartridge valve is ideal for applications requiring reliable kickdown relief, such as portable grain augers where quick response is critical. However, it may not be suitable as a system relief due to its overlap design intended to prevent false tripping. For optimal performance in overpressure prevention or regulation tasks, Sun's direct-acting valves are recommended alongside this pilot-operated model.