SUN HYDRAULICS
RPIELDN

***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 RPIELDN (RPIELDN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens rapidly but may sacrifice smoothness for speed. It activates when the inlet port pressure reaches the valve setting, opening to the tank port and throttling flow to limit pressure rise. The valve features low pressure rise versus flow and exceptionally fast response times. It is suitable for use in cross-port relief circuits, accepting maximum pressure at port 2; however, users should consider spool leakage in these applications. The main stage orifice is safeguarded by a 150-micron stainless steel screen, but it is not recommended for load-holding applications due to potential spool leakage. Back pressure on the tank port directly adds to the valve setting at a 1:1 ratio. The valve incorporates Sun's floating style construction to reduce internal part binding risks due to excessive installation torque or machining variations. The RPIELDN fits into a T-16A cavity and belongs to Series 3 with a capacity of 100 gpm (380 L/min). Factory pressure settings are established at 4 gpm (15 L/min), with a maximum operating pressure of 5000 psi (350 bar) and typical response time of 2 ms. Maximum valve leakage at 110 SUS (24 cSt) is rated at 4 in\u00b3/min (65 cc/min) at 1000 psi (70 bar). Adjustment involves up to five clockwise turns, with specific torque requirements for installation and adjustment components. This model weighs approximately 1.20 lb (0.55 kg) and uses Viton seals with available seal kit number 990016006.