How big is the valve business? Bigger than you might think. According to the Valve Manufacturers' Association (VMA), the U.S. industrial valve industry logs sales of approximately $2.7B. Biggest markets include the petrochemical, chemical, construction, and petroleum industries. Though the industry is big, VMA classifies most valve manufacturers as small to medium size businesses. Collectively, they employ 20,000 people in both manufacturing and support functions.