JEFA machinery is a full service,APIcertified, precision machining and fabrication business that specializes in the design an ... d manufacture wellhead equipment for all of your petroleum and natural gas extraction applications.In addition to providing superior quality and competitive rates on API 6A&16C products and other wellhead supplies, we can also supply you with OEM projects. We are firmly dedicated to providing the highest quality products and services for today's oilfield industry. →Head office in Shanghai ,2 plants in Yancheng, Jiangsu →2011 sales over 200 million →Over 200 employees →Design and research capability We are constantly striving to improve designs,streamline manufacturing processes, and reduce costs so that we can better serve our customers. read more