SUN HYDRAULICS
RPKSCAN

***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 RPKSCAN (RPKSCAN) is a pilot-operated, balanced poppet relief cartridge valve designed for pressure regulation applications. This valve remains normally closed until the inlet port pressure reaches the set threshold, at which point it opens to the tank port to throttle flow and regulate pressure. Notably, these valves are characterized by their accuracy, smooth operation, quiet performance, rapid response time of approximately 7 ms, and minimal pressure rise relative to flow. The internal modulation within the cartridge 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 variations in oil temperature or contamination levels due to its robust construction. Additionally, the main stage orifice is safeguarded by a 150-micron stainless steel screen for enhanced durability. The back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. For customization, W and Y controls allow adjustments throughout their full range unless a special setting is specified as the maximum limit. Corrosion-resistant models are available with external stainless steel or zinc-nickel plated components for use in harsh environments. The RPKSCAN incorporates Sun's floating style construction to reduce risks of internal part binding from excessive installation torque or machining variations. It fits into a Cavity T-18A with Series 4 capacity up to 200 gpm (760 L/min) and operates under a maximum pressure of 5000 psi (350 bar). The valve has minimal leakage with a reseat rate of just 10 drops/min (0.7 cc/min) and requires specific torque settings for installation and adjustment components. A Viton seal kit is available under part number 990318006 for maintenance needs.