Gloucester-based Severn Glocon Group specialises in providing process control valve solutions for the world's industrial markets. It has exported its valves to the world's largest liquid natural gas project at Sakhalin Island in Russia and to the Middle East. Owner Maurice Critchley left school at 17 and after a degree in economics and a range of management jobs, bought a small valve maker in 1989 backed by a bank loan. Seven years later he bought the valves division of industrial group BTR in a £2m deal. In 2013 Severn Glocon made £13.2m profit on £94.4m sales.
Latest turnover: £94m
Five-year rise in turnover: 109%
No. of employees: 778
Five-year rise in employment: 143%