Valvtechnologies, Inc. (VTI) - Founded in 1986, VTI’s manufacturing and corporate headquarters is located in Houston, Texas U.S.A. With over 150 employees, all manufacturing, design, engineering, machining, testing and assembly functions are performed here. There is 20,000 square feet of office space and 82,000 square feet of air conditioned manufacturing space. All parts, machinery, castings and forgings are made in the U.S.A. - ISO 9001, API, Q1, 6A & 6D, PED/CE, ATEX Certified