SUN HYDRAULICS
RPITLAV

***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 RPITLAV (RPITLAV) is a pilot-operated, anti-shock relief cartridge designed to limit maximum system pressure and control the rate of pressure rise. It functions by opening the valve and then ramping it closed at a constant speed, independent of settings and flows. The adjust screw sets both the maximum relief setting and the minimum threshold setting. This valve is physically and functionally interchangeable with all 2-port relief cartridges except pilot reliefs, offering compatibility in terms of flow path and cavity for a given frame size. It can handle maximum pressure at port 2, making it suitable for use in cross-port relief circuits but not in load-holding applications. When the inlet port pressure exceeds the threshold setting, the valve opens to tank port 2. The pilot section moves forward steadily, compressing the pilot spring to increase the setting until a mechanical stop is reached at maximum setting. This feature provides protection against pressure transients caused by sudden load changes, particularly beneficial for variable displacement pumps where displacement mechanisms might be slow to respond. Additionally, it safeguards hydrostatic drives by mitigating jerks from sudden reversals. When combined with a switching device, it can mimic ramp characteristics typically provided by proportional valves. The valve offers further utility in small power units that start against an anti-shock relief to enhance pump life longevity. The back pressure on tank port 2 is directly additive to the valve's setting at a 1:1 ratio. Its design incorporates Sun's floating style construction to minimize internal binding risks due to excessive installation torque or machining variations. Key specifications include a capacity of 100 gpm (380 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and an adjustment capability of up to 4.5 clockwise turns for increasing settings. The valve has specific installation torque requirements and comes with an optional Viton seal kit (990316006).