sega company has got the eu ce certification, iso14001 environmental management system certification, iso18001 occupational health and safety management system certification, and has obtained more than 20 national patents. it has set physical and chemical room, measurement room and quality record archive room in accordance with the international standards, adhering to the incoming inspection and in-process inspection, and has cnc machining center, cnc machine, large vertical lathe, boring mill, milling machine, automatic spraying assembly line and other sophisticated machining equipment. major products of the company are gate valve, globe valve, butterfly valve, ball valve, check valve, strainer, hydraulic control valve and other high-end valves and pipe fittings for water industry system. in addition to meeting national gb std., the products mainly conform to ansi, awwa, din, bs and other advanced industrial national standards. the pressure of products ranges from 150 lb to 2500lb and from 1.6mpa to 42.0mpa, and the nominal diameter ranges nps1/2* ~ 56" and  dn15mm ~ 1400mm. owing to the mature technological process and scientific quality assurance system, the quality of sega products has been strictly controlled and continuously improved from design, procurement to production. all of these have ensured the reliability, stability and usability of products, fully meeting the high quality product demands and effectively protecting customers' economic interests. the products are widely used in many industries about petroleum, petrochemical, oil refining, chemical engineering, chemical fertilizer, natural gas, electric power, water and mining, which have gained good market in high-end water affairs of more than 30 countries and regions, praised and trusted by users.