Jianhu Zhongda Petroleum Machinery Co., Ltd. has more than 20 years of experience of design and manufacturing all kinds of high pressure flat valve, wellhead devices, etc. We have advanced technology and special equipments. And we have become one of the domestic earlist passed ISO9000 international quality system authentication enterprises. We have regulated the program files and internal management standards, thus make sure the system operated effectively. The products had already formed series. The products have throtting pressure pipe remit device, valve....