SUN HYDRAULICS
RPIEQQV

***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 RPIEQQV (RPIEQQV) is a fast-acting, pilot-operated, balanced piston relief cartridge designed for pressure-limiting applications in hydraulic systems. These normally closed valves are engineered to protect hydraulic components from pressure transients by quickly opening and closing, although this speed comes at the expense of smoothness. When inlet port 1 reaches the valve's preset pressure, it begins to open to tank port 2, throttling flow to limit further pressure increase. This model offers low pressure rise versus flow and is known for its rapid response time of approximately 2 milliseconds. It is suitable for cross-port relief circuits and can handle maximum pressures up to 5000 psi (350 bar) at port 2, though spool leakage should be considered in these applications. The RPIEQQV features a main stage orifice protected by a 150-micron stainless steel screen and utilizes Sun\u2019s floating style construction to minimize internal binding due to installation torque or machining variations. The valve is not recommended for load-holding applications due to potential spool leakage. Back pressure on the tank port adds directly to the valve setting at a 1:1 ratio. This cartridge fits into T-16A cavities and offers a capacity of up to 100 gpm (380 L/min). The factory pressure settings are established at a flow rate of 4 gpm (15 L/min), with maximum valve leakage rated at 4 in\u00b3/min (65 cc/min) under specific conditions. The valve's adjustment can be fine-tuned with an internal hex screw that requires up to five clockwise turns to increase the setting. The installation torque range is between 150 and 160 lbf\u00b7ft (203 - 217 Nm), ensuring secure placement in hydraulic systems. The model weighs approximately 1.20 lb (0.55 kg) and uses Viton seals for reliable performance under various conditions.