SUN HYDRAULICS
RPCCLCN

***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 RPCCLCN (RPCCLCN) is a pilot-operated, balanced piston relief cartridge designed for pressure regulation in hydraulic systems. This valve is normally closed and begins to open to the tank port when the inlet pressure reaches the set value, effectively throttling flow to maintain desired pressure levels. It features a low-pressure rise versus flow characteristic, providing smooth and quiet operation with moderate speed. The RPCCLCN can handle maximum pressure at port 2 and is suitable for cross-port relief circuits; however, spool leakage should be considered in these applications. The minimum pressure setting for all spring ranges is 75 psi (5 bar), and it is not recommended for load-holding applications due to potential leakage. The valve's design incorporates Sun's floating style construction, which minimizes the risk of internal part binding from excessive installation torque or machining variations. It includes a main stage orifice protected against contamination and can be configured with EPDM seals for systems using phosphate ester fluids, although exposure to petroleum-based substances should be avoided as it may damage the seals. With a capacity of 12 gpm (45 L/min) and a maximum operating pressure of 5000 psi (350 bar), this cartridge offers reliable performance with a typical response time of 10 ms. It allows adjustment via an internal hex screw, with five clockwise turns increasing the setting. Installation requires specific torque specifications: 20-25 lbf ft (27-33 Nm) for the valve and 80-90 lbf in (9-10 Nm) for the locknut. The RPCCLCN weighs approximately 0.20 lb (0.10 kg) and uses Viton seal kits such as the 990162006 for maintenance or replacement needs.