Imperial Valve started designing & developing Double Block & Bleed valves in 1990. This was right when these kinds of valves saw the first light.
Imperial Valve has been one of the pioneers in developing the product.
The quality system of Imperial Valve products is approved and certified by DNV GL according to ISO 9001:2015.
Imperial Valve pipeline (soft seated) Double Block and Bleed products are designed to ISO 10497.