SUN HYDRAULICS
RVGALDN

***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 RVGALDN (RVGALDN) is a ventable, pilot-operated, balanced piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to the tank port when the inlet pressure reaches a predetermined setting, effectively throttling flow to maintain desired pressure levels. It features a vent port that facilitates remote control through additional pilot or two-way valves. The RVGALDN is known for its accuracy, low-pressure rise versus flow, smooth operation, and moderate speed. This relief cartridge is capable of handling maximum pressures at port 2 and is suitable for cross-port relief circuits, although spool leakage should be considered in such applications. A 150-micron stainless steel screen protects the main stage orifice. However, it is not recommended for load-holding applications due to potential leakage issues. Back pressure on the tank port directly affects the valve setting at a 1:1 ratio. The valve's construction incorporates Sun's floating style design to minimize internal binding risks due to installation torque or machining variations. Configurations with EPDM seals are intended for use with phosphate ester fluids; exposure to petroleum-based substances can damage these seals. The RVGALDN fits into cavity T-17A and belongs to Series 3 with a capacity of up to 60 gpm (240 L/min). It operates under a maximum pressure of 5000 psi (350 bar) and maintains control pilot flow between 15-20 in\u00b3/min (0.25-0.33 L/min). Typical response time is around 10 milliseconds, with maximum valve leakage specified at 4 in\u00b3/min at 1000 psi (65 cc/min at 70 bar). The adjustment mechanism allows up to five clockwise turns to increase settings, and installation requires specific torque values for both the valve and locknut components.