SUN HYDRAULICS
RVEALFN

***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 RVEALFN (RVEALFN) is a ventable, pilot-operated, balanced piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to tank port 2 when the inlet port 1 pressure reaches the set threshold, thereby throttling flow to maintain desired pressure levels. It features a vent port, port 3, allowing for remote control via other pilot or two-way valves. The RVEALFN is noted for its accuracy, low pressure rise relative to flow, smooth and quiet operation, and moderate speed. It's capable of handling maximum pressure at port 2 and is suitable for cross-port relief circuits; however, spool leakage should be considered in such applications. A stainless steel screen protects the main stage orifice from debris larger than 150 microns. The valve is not recommended for load-holding applications due to potential spool leakage. The RVEALFN's back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. For systems using phosphate ester fluids, cartridges with EPDM seals are available; these seals are incompatible with petroleum-based fluids. The valve incorporates Sun's floating style construction to minimize internal binding risks from excessive installation torque or cavity/cartridge machining variations. Key specifications include a capacity of up to 30 gpm (120 L/min), a maximum operating pressure of 5000 psi (350 bar), and a factory pressure setting established at 4 gpm (15 L/min). The control pilot flow ranges between 10-15 in\u00b3/min (0.16-0.25 L/min), with typical response times around 10 ms and maximum valve leakage at specified conditions being about 3 in\u00b3/min (50 cc/min). Adjustments are made by turning clockwise up to five times, with specific torque requirements outlined for installation and locknut settings.