Valves have been around since the Roman Empire and are used daily by consumers and industries alike. Every facet of the modern world would not be possible without these devices.
The market for industrial valves alone is expected to be just under $61 Billion in 2015. Source: McIlvaine Company.
On a monthly basis over 700,000 searches for only valve products are made using Google i.e. the term 'valve' used in relation with any company were excluded.