Alan Cobham has won an order to supply a number of density-sensitive water drain valves for a Middle East oil company, for use when draining water from the bottom of oil storage tanks. The valves will be used on oil storage tanks, for use when draining water from the bottom of tanks. They will prevent fuel carry over and minimise the risk of environmental pollution. Cobham’s valves are also used on floating-roof oil storage tanks, installed on the rainwater drain line, and will automatically close if oil or fuel is detected in the water stream. They are available for systems from 50–100mm in diameter in cast aluminium or, optionally, fabricated in stainless steel. Options include a manual check function and a borosilicate glass observation window.