Air Balance Valve

Air Balance Valves or Silo Safety Valves are used to protect bins and silos from over pressure and under pressure damage. Under pressure collapse of a silo may occur if a column of material that has hung up in the silo suddenly dislodges and slides down creating a vacuum above the material. For the prevention of over pressure damage the valve would typically be fitted to bins and silos that are fed by a pneumatic conveying line or fed from a bulk tanker.
The settings of pressure and vacuum can be adjusted by changing the weights fitted to the sealing flaps. Standard settings are at +1.5 kPa and -1.5 kPa. The unit may not be used as a substitute for an explosion panel for potentially explosive products in the bin or silo. Typical material of construction is mild steel. Stainless steel units are also available.