When the system pressure gradually increases to the set pressure, the valve opens, the medium flows out, and the system pressure drops. When the system pressure drops to the resealing pressure, the valve closes again. The higher the system pressure, the higher the opening height of the valve. However, these valves have no volume rating limitations. Some systems require proportional unloading valves to meet specific safety criteria, so users must confirm whether these valves comply with these criteria.
