VICKERS RV1-10-I-0-9/7.5

Functionally, this Vickers RV1 series valve is built to hold up in demanding, high-cycle mobile hydraulic systems like those found in harvesters.

Poppet-style valves like this one handle repeated pressure cycles well because the sealing element is simple and doesn't rely on close-fitted spools that can wear unevenly over time. The RV1 series was built with high-cycle applications in mind, harvesters included, so it's a reasonable fit for that kind of punishing daily use. It's rated to 350 bar (5000 psi) and handles up to 300 L/min across the series, though this particular configuration is rated for 30 litres per minute of flow. If your system stays within those numbers, the valve should hold up through the kind of pressure spikes you're describing without giving you much trouble.