SUN HYDRAULICS CORP
COBABCV
Load Holding

This valve is a spring biased closed, pilot-to-close check cartridge that has a 3:1 pilot ratio. The valve allows flow from port 1 to port 2 and blocks reverse flow. Pressure at the pilot port opposes pressure at port 1 at a ratio of 3:1. This valve is most often used in regeneration circuits.

• Features hardened steel seats for excellent wear characteristics and contamination tolerance.
• Product is not available with A and B spring ranges (4 and 15 psi (0,3 and 1 bar)).
• Pressure at the port 2 area directly opposes pilot pressure.
• Reverse flow through the valve from port 2 to port 1 is not possible under any condition.
• Nominal pilot ratio is 3:1. This means that a pressure of 1000 psi (70 bar) at the pilot port will close a valve against a pressure of 3000 psi (205 bar) at port 1. Any decay or loss of pilot pressure could allow the valve to open, even if it is a momentary decay or loss.
• Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
• Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.