Polymer composite pressure relief valve; the same last-resort silo safeguard as the steel VCP, built in composite rather than metal. At 6 kg it is a fraction of the weight of the comparable steel unit, which makes a real difference when it has to be carried up a silo ladder and fitted at height by one person. The composite construction also removes the corrosion problem that eventually claims painted mild steel valves on exposed Irish silo tops. Thousands in service worldwide.
