SUN HYDRAULICS
RPIEMQN

***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 RPIEMQN (RPIEMQN) 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 to tank port 2 when the inlet port 1 pressure reaches its set point, throttling flow to limit further pressure increase. It features a low pressure rise versus flow and responds swiftly, typically within 2 milliseconds. The valve is designed for interchangeability across all 2-port relief cartridges of the same frame size and flow path. It can handle maximum pressure at port 2, making it suitable for cross-port relief circuits; however, users should consider spool leakage in such 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 leakage. The back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. Sun's floating style construction minimizes the risk of internal part binding from excessive installation torque or machining variations. This cartridge fits into Cavity T-16A, Series 3 and has a capacity of up to 100 gpm (380 L/min). Its maximum operating pressure is rated at 5000 psi (350 bar), with factory settings established at a flow rate of 4 gpm (15 L/min). The valve has a hex size of 1-1/4 inches (31.8 mm) and requires an installation torque between 150-160 lbf ft (203-217 Nm). A separate adjustment screw with an internal hex size of 5/32 inches (4 mm) allows for setting adjustments through five clockwise turns, while the locknut requires an additional torque of 80-90 lbf in (9-10 Nm).