SUN HYDRAULICS
RELIEF CART
RPCCLAN

***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 RPCCLAN (Material Number: RPCCLAN) is a pilot-operated, balanced piston relief cartridge designed to function as a normally closed pressure regulating valve. This component is engineered to open to tank port 2 when the pressure at inlet port 1 reaches the set valve pressure, effectively throttling flow to maintain regulated pressure. Known for its accuracy, low-pressure rise versus flow, and smooth operation, this valve is moderately fast and operates quietly. The RPCCLAN model is physically and functionally interchangeable with other 2-port relief cartridges of the same frame size, offering versatility in various applications. This relief cartridge can handle a maximum operating pressure of 5000 psi (350 bar) and features a capacity of 12 gpm (45 L/min). It accepts maximum pressure at port 2 and is suitable for cross-port relief circuits; however, users should account for spool leakage in such configurations. The minimum setting available for all spring ranges is 75 psi (5 bar), but it is not recommended for load-holding applications due to potential spool leakage. The design incorporates Sun's floating style construction to minimize internal part binding caused by excessive installation torque or machining variations. The main stage orifice is protected against contamination, ensuring reliability in operation. Cartridges configured with EPDM seals are intended for use with phosphate ester fluids only; exposure to petroleum-based fluids could damage these seals. For installation, the valve hex size measures 3/4 inch (19.1 mm), with an installation torque range of 20-25 lbf ft (27-33 Nm). Adjustment settings are made via an internal hex screw sized at 5/32 inch (4 mm), while the locknut requires a torque of 80-90 lbf in (9-10 Nm). Weighing just .20 lb (.10 kg), this cartridge offers robust performance in hydraulic systems requiring precise pressure regulation.