SUN HYDRAULICS
RPESYWN

***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 RPESYWN (Material Number: RPESYWN) is a pilot-operated, balanced poppet relief cartridge designed to function as a pressure regulating valve. This normally closed valve begins to open when the inlet port 1 reaches the designated pressure setting, directing flow to tank port 2 and effectively regulating pressure. Notable for its accuracy, smooth operation, and low noise levels, this valve offers fast response times and minimal pressure rise with increased flow. A key feature is its immunity to cavitation-related issues such as noise and manifold erosion, due to modulating occurring inside the cartridge. The valve can withstand maximum pressure at port 2, making it suitable for cross-port relief circuits and load-holding applications. It remains relatively unaffected by variations in oil temperature or contamination. The main stage orifice is safeguarded by a 150-micron stainless steel screen, enhancing durability. Back pressure on tank port 2 directly adds to the valve setting in a 1:1 ratio. The RPESYWN model incorporates Sun's floating style construction to prevent internal binding from excessive installation torque or machining inconsistencies in cavity/cartridge setups. It allows adjustment throughout its full range using W or Y controls unless specified otherwise for special settings. With a capacity of 25 gpm (95 L/min) and maximum operating pressure of 5000 psi (350 bar), it boasts a typical response time of 7 ms and minimal leakage at standard viscosity levels. Installation requires specific torque values: valve installation between 30-35 lbf ft (41-47 Nm), adjustment screw internal hex size of 5/32 in., locknut hex size of 9/16 in., and locknut torque between 80-90 lbf in. (9-10 Nm). The unit weighs approximately .30 lb (.15 kg) and uses Viton seal kits like the cartridge model number 990310006 for maintenance needs.