Dear Friend, We are Zigao Valve Co., Ltd approved by API 6D, API 607, CE, ISO certificates. and specialized in valves, including gate valve, ball valve, globe valve, check valve, butterfly valve, plug valve, strainer, etc. Valves nominal size from 1/2" to 48" (DN15 to DN1200); nominal pressure from 150Lb to 2500Lb (PN1.0Mpa to PN42.0Mpa). The products are widely used in the fields of petroleum, chemical, water treatment, metallurgy, power, fuel gas, city pipeline networks and so on. Our main business is to export the valves to the worldwide customers with reliable quality and reasonable price. Please let us know if you have inquiry. Best regards, Lorin