WENZHOU PIONEER VALVE COMPANY is located in China Valve City----Longwan, specialized in doing with ball valves for more than 20 years. "OULIFA" is a registered trademark of the pressure valve, and "Pioneer" is a registered trademark of the vacuum valve. Since 1993 we are committed to product development, engineering excellence, precision manufacturing, 100% quality testing, and hands-on technical assistance. Many of our products are recognized as the best in the industry. We have passed the ISO9001: 2008 quality management system certificate, CE certificate and got the TS certification (manufacture License of the special equipment, pressure piping components). Our products are high quality with competitive price. Hope to cooperate with you!