... design project 5.passed ISO9002 About factory: TIANJIN WORLDS VALVE Co., Ltd. is a production, sales and service ... introduce advanced technology, continuous innovation. Products have been widely used in water conservancy construction users, petrochemical, metallurgy, electric ... proffesional ... to NACE MR-01-75 on request. Available also in low temperature steels, low alloy steels, stainless steels, ...