Danfoss / Eaton Integrated Hydraulics 1CPBD300F2P

For that kind of application, a pilot-assisted relief with check is exactly what you want. The 1CPBD300F2P is built around that style, which means it uses pilot pressure to control the release of a load rather than letting it free-fall or spike. That gives you smooth, stable movement even when the load is fighting back. It's rated up to 350 bar (5000 psi) and handles up to 550 L/min, so flow capacity on a harvester boom shouldn't be an issue. The 300 L/min flow rate listed for this specific configuration keeps it well within a working range for that kind of cylinder circuit.

This valve is designed for mobile and industrial applications such as harvesters and refuse haulers.