SUN HYDRAULICS
RVIALEV

***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 RVIALEV (RVIALEV) is a ventable, pilot-operated, balanced piston relief cartridge designed for precise pressure regulation in hydraulic systems. This valve remains normally closed and begins to open when the pressure at inlet port 1 reaches the pre-set level, directing flow to tank port 2 to manage pressure effectively. It features a vent port 3 that facilitates remote control through other pilot or two-way valves. Notably, these cartridges are known for their accuracy, smooth operation, quiet performance, and moderate response speed. The valve can handle maximum pressure at port 2 and is suitable for cross-port relief circuits with attention to spool leakage considerations. It includes a main stage orifice protected by a 150-micron stainless steel screen and requires the relief valve setting to be higher than the pilot valve setting. The RVIALEV is not recommended for load-holding applications due to potential spool leakage. For specific fluid compatibility, cartridges with EPDM seals are intended for systems using phosphate ester fluids; exposure to petroleum-based substances can damage these seals. The design incorporates Sun's floating style construction to reduce risks of internal binding due to installation torque or machining variations in the cavity/cartridge interface. Technical specifications include a T-19A cavity, Series 4 capacity of 120 gpm (480 L/min), and a factory pressure setting established at 4 gpm (15 L/min). It operates at a maximum pressure of 5000 psi (350 bar) with control pilot flow between 15-20 in\u00b3/min (0.25-0.33 L/min) and typical response time of 10 ms. Maximum valve leakage is rated at 5 in\u00b3/min at 110 SUS with adjustment requiring up to five clockwise turns for increased settings. The cartridge's installation torque ranges from 350-375 lbf ft (474-508 Nm), weighing approximately 3.10 lb (1.40 kg).