SUN HYDRAULICS
RPITLAN

***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 RPITLAN (RPITLAN) is a pilot-operated, anti-shock relief cartridge designed to limit maximum system pressure and control the rate of pressure rise. This valve is engineered to open and then ramp closed at a consistent speed, regardless of settings and flow rates. It features an adjust screw that determines both the maximum relief setting and the minimum threshold setting. All 2-port relief cartridges, except pilot reliefs, are interchangeable in terms of flow path and cavity for a given frame size. This model can handle maximum pressure at port 2, making it suitable for cross-port relief circuits, but it is not recommended for load-holding applications. When inlet port 1 pressure exceeds the threshold setting, the valve opens to tank port 2. The pilot section advances steadily, increasing the setting by compressing the pilot spring until a mechanical stop is reached at maximum setting. This valve offers protection for pumps and motors from pressure transients caused by sudden load changes\u2014particularly beneficial for variable displacement pumps with slow displacement mechanisms. It also reduces jerks in hydrostatic drives during sudden reversals and can be used with switching devices to provide ramp characteristics typical of proportional valves. The RPITLAN is ideal for small power units started against an anti-shock relief to extend pump life. Back pressure on tank port 2 adds directly to the valve setting at a 1:1 ratio. The Sun floating style construction minimizes internal binding risks due to excessive installation torque or machining variations. 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 range requiring 4.5 clockwise turns to increase settings. The model weighs approximately 1 lb (0.45 kg) and includes Viton seals as part of its design.