SUN HYDRAULICS
RPGECKN

***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 RPGECKN (RPGECKN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed to protect hydraulic components from pressure transients. This normally closed valve opens quickly when the pressure at inlet port 1 reaches the pre-set level, allowing flow to tank port 2 and throttling it to limit pressure rise. It features low pressure rise versus flow and rapid response times, making it ideal for applications where speed is critical. The valve accepts maximum pressure at port 2, making it suitable for cross-port relief circuits, though users should consider spool leakage in such setups. The main stage orifice is safeguarded by a 150-micron stainless steel screen, ensuring reliable operation. However, it is not recommended for load-holding applications due to potential spool leakage. This cartridge incorporates Sun's floating style construction to minimize internal binding from excessive installation torque or machining variations. It can handle back pressure on tank port 2 directly additive to the valve setting at a 1:1 ratio. For systems using phosphate ester fluids, cartridges with EPDM seals are available; these seals are incompatible with petroleum-based fluids and greases. The RPGECKN cartridge fits into a T-3A cavity and boasts a series 2 capacity of up to 50 gallons per minute (200 liters per minute). It can operate at pressures up to 5000 psi (350 bar) with typical response times around 2 milliseconds. The valve's maximum leakage rate is specified as three cubic inches per minute at 110 SUS (24 cSt) under conditions of 1000 psi (70 bar). Users can adjust the setting with five full clockwise turns of an internal hex adjustment screw sized at 5/32 inches (4 mm), while the locknut requires a torque of between 80 and 90 lbf-in (9 and 10 Nm). The model weighs approximately .50 pounds (.25 kg) and uses Viton seal kits for optimal performance in various environments.