SUN HYDRAULICS
RVCALHE

***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 RVCALHE (Material Number: RVCALHE) is a ventable, pilot-operated, balanced piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve begins to open to tank port 2 when the inlet port 1 pressure reaches the set value, effectively throttling flow to maintain desired pressure levels. It features a vent port 3 that facilitates remote control via other pilot or two-way valves, enhancing its versatility and control capabilities. The valve is known for its accuracy, low pressure rise versus flow characteristics, smooth operation, quiet performance, and moderate speed. The RVCALHE is suitable for cross-port relief circuits due to its ability to accept maximum pressure at port 2. However, users should be mindful of spool leakage when applying it in such circuits. A key feature includes a main stage orifice protected by a 150-micron stainless steel screen. It's important to note that this valve is not recommended for load-holding applications due to potential spool leakage. Back pressure at tank port 2 adds directly to the valve setting at a 1:1 ratio. For systems utilizing phosphate ester fluids, cartridges with EPDM seals are available; however, exposure to petroleum-based fluids can damage these seals. The design incorporates Sun's floating style construction to reduce internal binding risks from excessive installation torque or machining variations. The RVCALHE fits into Cavity T-11A and belongs to Series 1 with a capacity of up to 15 gpm (60 L/min). It operates at pressures up to 5000 psi (350 bar) with typical response times around 10 ms. The control pilot flow ranges between 7-10 in\u00b3/min (0.11-0.16 L/min), and maximum valve leakage is specified at 2 in\u00b3/min (30 cc/min) under certain conditions. The adjustment mechanism allows for fine-tuning through clockwise turns, supported by specific hex sizes and installation torques detailed in the product specifications.