VICKERS FR1-20-F-16T-/45.00

Fixed pressure compensation is exactly what handles that problem. Regardless of how load-induced pressure swings around in the circuit, the valve works to maintain a consistent output flow. On a harvester with a demanding, variable-load circuit, that stability matters a lot more than folks sometimes realize until they've dealt with the frustration of chasing inconsistent flow. This valve is rated up to 350 bar (5,000 psi) and flows up to 227 litres per minute through a 1-inch port, so it's well within range for mid-to-large circuits like what you're describing.