SUN HYDRAULICS
RPCCLQE

***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 RPCCLQE (RPCCLQE) is a pilot-operated, balanced piston relief cartridge designed for precise pressure regulation. This normally closed valve begins to open to tank port 2 when the inlet port 1 pressure reaches the set value, effectively throttling flow to maintain stable pressure levels. Notable for its accuracy and low-pressure rise versus flow characteristics, it operates smoothly and quietly with moderate speed. The RPCCLQE is functionally interchangeable with other two-port relief cartridges, sharing the same flow path and cavity size within a given frame size. It can handle maximum pressure at port 2, making it suitable for cross-port relief circuits, although users should account for spool leakage in such applications. The valve's minimum setting is 75 psi (5 bar) across all spring ranges, but it is not recommended for load-holding tasks due to potential leakage. Back pressure at tank port 2 directly affects the valve setting at a 1:1 ratio. The main stage orifice is contamination-protected, and cartridges equipped with EPDM seals are compatible with phosphate ester fluid systems; however, exposure to petroleum-based substances may damage these seals. The design incorporates Sun's floating style construction to reduce internal part binding risks from excessive installation torque or machining variations. With a capacity of 12 gpm (45 L/min), it operates under a maximum pressure of 5000 psi (350 bar) and typically responds within 10 ms. Valve adjustments are made via an internal hex screw with specific torque requirements detailed in its specifications. Weighing just .20 lb (0.10 kg), this cartridge includes a Viton seal kit identified as part number 990162006.