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Unloader valves (max 450 l/min & 300 bar)

Valves

Unloader valves (max 450 l/min & 300 bar)

Emiltec offers a specialized range of unloader valves designed for high-flow rate applications in the max 450 l/min and 300 bar category. These professional-grade components are engineered to handle large water volumes combined with medium to high pressures, making them essential for municipal cleaning vehicles, fire-fighting systems, and industrial washing equipment requiring substantial flow rates.

High-capacity flow management

The unloader valves in this category are specifically designed to manage flow rates ranging from 50 l/min up to 450 l/min, with maximum working pressures reaching from 160 bar to 320 bar. This unique combination of high water volume capacity and significant pressure handling makes these valves ideal for applications where both substantial flow and adequate pressure are critical operational requirements.

Professional applications and use cases

These high-flow by-pass valves are engineered for demanding professional environments including car wash gantries, high-pressure fire-fighting systems, small to medium-size vehicles for urban cleaning and sewer jetting, and industrial washing systems requiring large water flow rates. The valves excel in applications where continuous high-volume water delivery is necessary, such as road washing vehicles, municipal cleaning operations, and automated washing installations.

Robust construction materials

Our high-flow unloader valves feature professional-grade construction with brass body designs that ensure durability and resistance to corrosion in demanding operational environments. Some models incorporate stainless steel components for applications requiring maximum pressure resistance and longevity in industrial settings where equipment faces continuous exposure to water and cleaning agents.

Leading manufacturers and proven reliability

Emiltec's max 450 l/min and 300 bar catalog includes unloader valves from industry-leading brands such as PA, Mecline, Hawk, Interpump, and R+M. Each valve is selected for its proven performance in high-flow applications and represents Made in Italy or Made in Germany manufacturing excellence, ensuring reliability in professional cleaning operations.

Operational functionality for high-volume systems

These by-pass valves operate on the principle of allowing pressure adjustment while managing substantial water volumes. When the delivery line is closed, water is diverted to bypass, enabling the pump to operate at low pressure despite the high flow capacity. This operational mechanism is particularly important in systems where frequent opening and closing of delivery lines occurs with large water volumes, protecting both pump and system components from excessive stress.

Key performance characteristics

The unloader valves in this category feature manually adjusted configurations, with some models offering control levers that enable operators to deactivate or activate the set pressure. Certain valves provide integrated banjo connections for versatile installation options, while others offer dual bypass outlets that guarantee ease of installation and operational flexibility in complex washing systems.

Application-specific valve selection

Different models within this range are optimized for specific applications. Valves designed for agricultural applications, such as those compatible with the Gamma series pumps, handle medium pressures with high flow rates. Industrial models are engineered for car wash gantries and urban cleaning vehicles, while specialized variants serve fire-fighting systems requiring both substantial water delivery and adequate pressure for effective operations.

Expert technical guidance and support

As an ISO 9001:2015 and ISO 14001:2015 certified company based in Reggio Emilia, Emiltec provides specialized technical assistance for selecting the optimal unloader valve for high-flow applications. Our experienced sales staff offers expert guidance on valve sizing, flow requirements, pressure ratings, and proper integration with plunger pumps designed to deliver large water volumes in professional cleaning and municipal service applications.