SUN HYDRAULICS
RPEEYHN

***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 RPEEYHN (RPEEYHN) is a fast-acting, pilot-operated, balanced piston relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve operates by opening to the tank port when the inlet port pressure reaches the valve setting, thus throttling flow and limiting pressure rise. Known for its low pressure rise versus flow and rapid response time of approximately 2 milliseconds, this cartridge is suitable for applications requiring quick pressure relief. It can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 25 gpm (95 L/min). The RPEEYHN model incorporates Sun's floating style construction to minimize potential internal binding due to excessive torque or machining variations. It features a main stage orifice protected by a 150-micron stainless steel screen and is not recommended for load holding applications due to spool leakage. The valve's backpressure on tank port 2 directly affects the valve setting at a 1:1 ratio, making it suitable for cross-port relief circuits while considering spool leakage. This relief cartridge is functionally interchangeable with other two-port relief cartridges within the same frame size, offering flexibility in various hydraulic systems. Adjustments can be made throughout its full range using W or Y controls unless specified otherwise with a special setting representing the maximum adjustment limit. The RPEEYHN model requires specific installation torques: 30-35 lbf ft (41-47 Nm) for valve installation and 80-90 lbf in (9-10 Nm) for locknut torque. It weighs approximately .30 lb (.15 kg) and uses Viton seal kits (990010006) for optimal performance under varying conditions.