SUN HYDRAULICS
RVIALAV

***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 RVIALAV (RVIALAV) is a ventable, pilot-operated, balanced piston relief cartridge designed as a normally closed pressure regulating valve. It activates when the inlet port 1 pressure reaches the valve setting, opening to tank port 2 and throttling flow to regulate pressure. This model features a vent port 3 for remote control by other pilot or two-way valves. Known for its accuracy and low pressure rise versus flow, it offers smooth, quiet operation with moderate response speed. The RVIALAV can handle maximum pressure at port 2, making it suitable for cross-port relief circuits; however, spool leakage should be considered in such applications. The main stage orifice is protected by a 150-micron stainless steel screen, and the relief valve setting must always exceed the pilot valve setting. It's not ideal for load-holding applications due to potential spool leakage. This cartridge incorporates Sun's floating style construction to reduce internal binding risks from excessive installation torque or machining variations. Configurable with EPDM seals for systems using phosphate ester fluids, exposure to petroleum-based fluids can damage these seals. It fits into cavity T-19A and offers a series 4 capacity of up to 120 gpm (480 L/min), with factory pressure settings established at 4 gpm (15 L/min). The maximum operating pressure is rated at 5000 psi (350 bar), with control pilot flow between 15\u201320 in\u00b3/min (0.25\u20130.33 L/min) and typical response time of around 10 ms. Maximum valve leakage stands at approximately 5 in\u00b3/min at 110 SUS (24 cSt) under conditions of up to 1000 psi (70 bar). Adjustment requires approximately five clockwise turns to increase settings, with specific torque requirements provided for installation and locknut adjustments. The model weighs about 3.10 lb (1.40 kg) and uses Viton seal kits like part number: 990019006 for maintenance or replacements.