Hagedorn manure spreaders use a custom designed flow control valve for precise control of unloading and application. Engineered and manufactured exclusively for Hagedorn, the valve works well with all types of hydraulic systems and includes an internal bypass for quick return regardless of unloading speed. All 5000 series and 8000 series Extraverts are standard-equipped with a sequencing valve. This feature is integrated into the flow-control valve and prevents the push-gate from engaging before the endgate is raised, preventing accidental damage due to a collision. The sequencing valve is available as an option on horizontal beater models. Flow controls are designed by our own engineering staff to work with all modern hydraulic systems and are manufactured by a reputable North American manufacturer.