Because of the sealing surface of steel that is cracking or temperature differential across the valve caused by surfacing too large valves and valve seat crack defects, cracks must be a cross-sectional dig site welding, according to the sealing surface of the alloy The nature of the heat treatment according to process requirements, the final repair with lathe and milling to qualified. Frank Wenzhou Valve Co., Ltd. Address: Wenzhou Yongqiang high-tech industrial park area of ??the Hill Industrial Exhibition Hong Road 59 Tel: 0577-86939928 Fax: 0577-86930999 Contact: Manager Wu Mobile: 18067796085 QQ: 1450086854 E-mail: 1450086854@qq.com flanged ball valve: http: //www.lankevalve.com