Alco Valves was established in 1977 and makes products and accessories for the oil, gas and energy sectors. In 2013, its parent company saw its profit soar to £5.9m on £18m sales. Stuart Lomax runs the West Yorkshire operation.
Latest turnover: £18m
Five-year rise in turnover: 64%
No. of employees: 111
Five-year rise in employment: 13%