SUN HYDRAULICS
RPKECBN

***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 RPKECBN (RPKECBN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed for hydraulic systems to protect components from pressure transients. This normally closed, pressure-limiting valve opens quickly to tank port 2 when the inlet port 1 reaches the set pressure, effectively throttling flow to limit pressure rise. Known for its rapid response and low pressure rise versus flow characteristics, this valve is suitable for applications requiring quick opening and closing actions. However, this comes at a cost of smoothness in operation. The RPKECBN can handle maximum pressures up to 5000 psi (350 bar) and has a typical response time of 2 milliseconds. It features a main stage orifice protected by a 150-micron stainless steel screen and incorporates Sun's floating style construction to minimize internal binding from installation torque or machining variations. This relief valve is interchangeable with other two-port relief cartridges of the same frame size, making it versatile for various setups. It can accept maximum pressure at port 2 and is suitable for cross-port relief circuits, though spool leakage should be considered in such applications. The back pressure on tank port 2 directly affects the valve setting at a 1:1 ratio. The RPKECBN has an adjustment range that allows five full clockwise turns to increase the setting, with specific torque settings required for installation and adjustment components. Though not recommended for load-holding applications due to potential spool leakage, it is ideal in scenarios where quick pressure release is critical, such as in certain agricultural machinery like portable grain augers. This model weighs approximately 2.50 lb (1.15 kg) and uses Viton seals with an available seal kit under part number 990018006.