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Safety Valve

Safety ValveConcept

The Alfa Laval Safety Valve is a spring loaded safety valve used to prevent overpressure in tanks and vessels in the dairy, food and beverage, and biopharm industries to reliably avoid damages to human beings and equipment.

Working principle

It is used to prevent inadmissible over pressures of fluids in tanks, containers and plant sections. From the factory the valve is configured with a set pressure upon request that is greater than the operating pressure. The valve opens against a spring force if the operating pressure increases the set pressure. Preferably, the Alfa Laval Safety Valve should be installed vertically. If mounted horizontal the set pressure will be a bit lower than specified due to the missing weight of the piston. Highest effect on DN80 and DN100.

Standard Design

The Alfa Laval Safety Valve comes in sizes from DN25 to DN100 with spring loaded set pressure range from 0.2 to 12 bar. The valve can be pneumatic or manually operated. Alfa Laval Safety Valve is delivered with PED certificate. Compliance to EN 4126-1 Compliance to PED 97/23/EC of the European Community. Fluid group II (Non-hazardous fluids).

Documentation

How It Works

Construction

The Alfa Laval Safety Valve comes in sizes from DN25 to DN100 with spring loaded set pressure range from 0.2 to 12.0 bar. The valve can be pneumatic or manually operated. The Alfa Laval Safety Valve is calibrated to the desired pressure set point, sealed and delivered with a corresponding PED certificate.

Operating principle

The closing force in the Alfa Laval Safety Valve is applied by a compressed spring with a set pressure greater than the operating pressure. In a potentially dangerous situation, the valve will open at the predetermined set pressure. The spring force acts in the closing direction and the force created by the pressure at the inlet of the safety valve acts in the opening direction. At a certain point, these forces will be balanced out and the valve will make an initial discharge to relieve the pressure.

The Alfa Laval Safety Valve

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