SUN HYDRAULICS
RPKTLAV

***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 RPKTLAV (RPKTLAV) is a pilot-operated, anti-shock relief cartridge designed to limit maximum system pressure and control the rate of pressure rise. This valve opens and ramps closed at a constant speed, independent of settings and flows. It features an adjustable screw that sets the maximum relief and minimum threshold settings. The valve is suitable for cross port relief circuits, accepting maximum pressure at port 2. However, it is not intended for load holding applications due to its design. When inlet pressure at port 1 surpasses the threshold setting, the valve opens to tank port 2, with the pilot section moving forward steadily to increase the setting by compressing the pilot spring until a mechanical stop is reached. The RPKTLAV provides protection against pressure transients in pumps and motors, particularly variable displacement pumps that may react slowly to sudden load changes. It also offers protection for hydrostatic drives by minimizing jerk from sudden reversals and can be used in cross-port applications. When paired with a switching device, it can mimic ramp characteristics typically provided by proportional valves. The valve allows small power units to start against an anti-shock relief for extended pump life. Back pressure on tank port 2 adds directly to the valve setting at a 1:1 ratio. All two-port relief cartridges are interchangeable within their frame size due to consistent flow path and cavity design. The RPKTLAV incorporates Sun's floating style construction to reduce internal binding risks from excessive installation torque or machining variations. Key specifications include a cavity size of T-18A, series 4 capacity of 200 gpm (760 L/min), factory pressure settings established at 4 gpm (15 L/min), maximum operating pressure of 5000 psi (350 bar), control pilot flow between 10-25 in\u00b3/min (0.16-0.41 L/min), typical response time of 2 ms, and a pressure ramp-up time between 400-600 ms. Adjustment involves up to 4.5 clockwise turns for increased settings, with specific torque requirements for installation and adjustment components provided in detailed specifications.