SUN HYDRAULICS
RPGTLCN

***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 RPGTLCN (Material Number: RPGTLCN) 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 ramp closed at a constant speed, independent of settings and flows, ensuring stable system performance. The adjust screw allows users to set both the maximum relief and minimum threshold settings. All two-port relief cartridges, except pilot reliefs, are interchangeable in terms of flow path and cavity for a specific frame size. This valve can accept maximum pressure at port 2, making it suitable for cross-port relief circuits but not for load-holding applications. When the pressure at inlet port 1 surpasses the threshold setting, the valve opens to tank port 2. The pilot section advances steadily, compressing the pilot spring to increase the setting until a mechanical stop is reached. This mechanism protects pumps and motors from pressure transients caused by sudden load changes\u2014particularly beneficial for variable displacement pumps where displacement mechanisms may be too slow to respond. Additionally, it reduces jerkiness in hydrostatic drives during sudden reversals. The RPGTLCN can be used with switching devices to provide ramp characteristics typically associated with proportional valves. It also allows small power units to start against an anti-shock relief for extended pump life. Back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. With Sun's floating style construction, this valve minimizes internal part binding due to excessive installation torque or cavity/cartridge machining variations. Key specifications include a cavity size of T-3A Series 2 with a capacity of 50 gpm (200 L/min), maximum operating pressure of 5000 psi (350 bar), and typical response time of 2 ms. The adjustment requires approximately 4.5 clockwise turns to increase settings, with various hex sizes specified for installation and adjustments.