SUN HYDRAULICS
RPEEKEN

***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 RPEEKEN (Material Number: RPEEKEN) 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 specified setting, diverting flow to the tank port to manage pressure rise. Notable for its quick response time of approximately 2 milliseconds and low pressure rise versus flow characteristics, this valve is suitable for applications where rapid opening and closing are prioritized over smoothness. It can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 25 gpm (95 L/min). The valve's main stage orifice is safeguarded by a 150-micron stainless steel screen, although it is not ideal for load-holding applications due to potential spool leakage. The valve's back pressure at tank port 2 directly influences the valve setting at a 1:1 ratio. All two-port relief cartridges in this series are interchangeable in terms of flow path and cavity size. Adjustments can be made using W or Y controls unless a special setting is specified, which then represents the maximum allowable setting. The design incorporates Sun's floating style construction to reduce internal binding risks during installation or due to machining variations. Additional specifications include an adjustment range requiring up to five clockwise turns to increase settings, with specific torque requirements for installation and locknut adjustments. The model weighs approximately 0.30 lb (0.15 kg) and uses Viton seals available under cartridge seal kit number 990010006.