The recently completed year-long project at the Inchinnan site, the European headquarters of US based parent company Bray International, now means the business has more space to carry stock and a larger capacity for product testing.
Additional office space, including meeting and training rooms, has also been created bringing the total size of the complex to 37,000 square feet.
Bray makes valves for industries such as the chemical and oil and gas sectors in areas ranging from distilling to desalination.
Projects it is working on at the moment include supplying to the Sadara Chemical Company in Saudi Arabia and the Thames Oilport in Essex.
Bray's Scottish arm, opened in 1990, now employs 70 people and also has staff from France, Germany, Holland, Poland, Russia and Dubai reporting in to it.
George Crooks, managing director for Europe, said the business has benefited from developing new products and targeting sales towards growing economies in the Middle East and Africa.
He said: "Amidst turbulent times in the economy, we have succeeded in bucking the trend by experiencing rapid growth, most dramatically over the last three years when we have seen our turnover increase from £9m in 2010 to a projected £16m for 2013."
Mr Crooks said Bray has the potential to add a further 10,000 square feet in Renfrew in the future if sales continue to accelerate.
He attributed the success to a long serving and skilled workforce.
He added: "We can boast a team of highly experienced people, including those who have been with us since we opened here in Scotland.
"Several have stayed on past retirement, and we have a management team all appointed through internal promotion."
Bray International has its headquarters in Texas and 17 offices around the world.