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SB Anti Vacuum Valve

Concept

The Anti Vacuum Valve is used for minimizing the risk of implosion of tanks exposed to vacuum e.g. during emptying, cool-rinsing after hot-cleaning or caustic cleaning in a CO2 atmosphere. The Anti Vacuum Valve can be applied on any closed tank.

Working principle

The Anti Vacuum Valve is delivered with counter weight set and locked for an individual opening vacuum to suit the tank design data. When a vacuum in the tank is lower than the preset opening value, the valve opens and lets in atmospheric air

Documentation

How It Works

Construction

The Alfa Laval SB Anti Vacuum Valve is a flange mounted safety valve that an integral part of a SCANDI BREW® tank top system. All product wetted steel parts are made of AISI 316L stainless steel with a surface roughness of Ra < 0.8 μm; all other steel parts are made of AISI 304L stainless steel. All product wetted seals are made of EPDM and all product wetted polymers are made of PEEK.

It is available in two versions:

• Integrated in a SCANDI BREW® tank top system
• Mounted on its own counter flange

sb-pressure-relief-valve

The valve should be seated horizontally. A maximum inclination of 10° is acceptable, but the lever arm must then point in to the center of the cylindroconical tank top.

Operating principle

The SB Anti Vacuum Valve is delivered with counterweight set and locked for an individual opening vacuum to suit the tank design data. When a vacuum in the tank is lower than the preset opening value, the valve opens and lets in atmospheric air.

Cleaning-in-Place (CIP)

The Anti Vacuum Valve is cleaned, when closed, by the tank cleaning head. However, this does not include cleaning of the valve seat. There are two options available for CIP of the valve seat (see Options below). It is very important to note that if the cleaning procedure includes hot cleaning, the valve should be dimensioned with the purpose of preventing implosion from the vacuum that appears when flushing with cold water.

Options

These two options are available for Cleaning-In-Place (CIP) of the valve seat.

CIP Kit 1: Force opener and splash guard

The valve is forced opened during tank CIP. The cleaning of valve seat is dependent on cleaning jets from the tank cleaning head. Any CIP liquid that escapes the tank is contained by the splash guard and drains back into the tank.

CIP Kit 2: Force opener, splash guard, CIP nozzle and CIP closing valve

The valve is forced opened during tank CIP. The cleaning of valve seat is performed by the CIP nozzle. All CIP liquid from the CIP nozzle is contained by the splash guard and drains back into the tank.

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