SUN HYDRAULICS
RPKECEN

***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 RPKECEN (RPKECEN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens rapidly when the inlet port pressure reaches the valve setting, directing flow to the tank port to limit pressure rise. Its design ensures low pressure rise versus flow and quick response times, typically around 2 milliseconds. The RPKECEN is suitable for cross-port relief circuits due to its ability to accept maximum pressure at port 2; however, users should consider spool leakage in such applications. The main stage orifice is safeguarded by a 150-micron stainless steel screen, although it is not recommended for load-holding applications due to potential leakage. This relief cartridge features Sun's floating style construction, minimizing internal part binding risks from excessive installation torque or machining variations. It fits into a T-18A cavity with a Series 4 capacity of 200 gpm (760 L/min) and can handle a maximum operating pressure of 5000 psi (350 bar). The valve's leakage at 110 SUS (24 cSt) is minimal at 5 in\u00b3/min (80 cc/min) under 1000 psi (70 bar). Adjustments are made through an internal hex screw with five clockwise turns required to increase settings. Installation requires a torque of 350-375 lbf\u00b7ft (474-508 Nm), and the unit weighs approximately 2.50 lb (1.15 kg). A Viton seal kit is available for maintenance needs.