Yongjia Dory Machinery Co.,Ltd was established in 2009 ,during these years dory valve testing equipment has been developed into the international market as the superior leader in China domestic market, regarding both the market share and the advanced technology. Our valve testing equipment have being sold to over 20 countries and won a high reputation with good quality and strong after sale services. All of our products are designed , developed, manufactured and tested by ourselves. The product development is influenced by the experience that many of our customers have made during their various ...