SUN HYDRAULICS
RPKCCNV

***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 RPKCCNV (RPKCCNV) is a pilot-operated, balanced-piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to the tank port when the inlet pressure reaches the preset level, effectively throttling flow to maintain desired pressure levels. It is engineered for accuracy with minimal pressure rise versus flow, ensuring smooth and quiet operation while providing moderate speed response. The valve can handle a maximum operating pressure of 5000 psi (350 bar) with a typical response time of 10 milliseconds. It features a main stage orifice protected by a 150-micron stainless steel screen, making it suitable for cross port relief circuits, though spool leakage should be considered in such applications. However, it is not suitable for load-holding applications due to potential spool leakage. This cartridge valve is interchangeable with other two-port relief cartridges within the same frame size and flow path, offering versatility in system design. It incorporates Sun's floating style construction to minimize internal binding risks caused by installation torque or machining variations. For environments requiring corrosion resistance, options are available with stainless steel or zinc-nickel plated components. The valve supports adjustments via W or Y controls across its full range unless a special setting is specified as the maximum limit. Installation requires specific torque settings: 350-375 lbf ft (474-508 Nm) for the valve and 80-90 lbf in (9-10 Nm) for the locknut. Weighing 2.50 lb (1.15 kg), this cartridge utilizes Viton seals compatible with phosphate ester fluids but may degrade when exposed to petroleum-based substances. Ideal applications include systems requiring reliable pressure control where cross port relief capabilities are beneficial, such as agricultural machinery like portable grain augers where safety mechanisms are critical.