SUN HYDRAULICS
RVCALDE

***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 RVCALDE (RVCALDE) is a ventable, pilot-operated, balanced piston relief cartridge designed as a normally closed pressure regulating valve. It functions by opening to the tank port when the inlet pressure reaches the preset valve setting, effectively throttling flow to maintain regulated pressure levels. This model features an additional vent port that allows for remote control by other pilot or two-way valves, providing enhanced operational flexibility. Known for its accuracy and low-pressure rise versus flow characteristics, this valve operates smoothly and quietly with moderate speed. Key specifications include a maximum operating pressure of 5000 psi (350 bar) and a capacity of 15 gpm (60 L/min). The main stage orifice is safeguarded by a 150-micron stainless steel screen, ensuring durability and reliability. However, it is not suitable for load-holding applications due to potential spool leakage. The back pressure on the tank port directly adds to the valve setting at a 1:1 ratio. This model can accept maximum pressure at port 2, making it suitable for cross-port relief circuits\u2014though spool leakage should be considered in such applications. Cartridges configured with EPDM seals are specifically designed for systems using phosphate ester fluids; exposure to petroleum-based fluids may damage these seals. The RVCALDE incorporates Sun's floating style construction, minimizing risks of internal part binding from excessive installation torque or machining variations. It requires specific installation torques and adjustments: the valve hex size is 7/8 in. (22.2 mm), with an installation torque of 30-35 lbf ft (41-47 Nm). The adjustment screw has an internal hex size of 5/32 in. (4 mm), while the locknut hex size is 9/16 in. (15 mm), requiring a torque of 80-90 lbf in. (9-10 Nm).