China-based Zhejiang Teer Valve Co. Ltd has successfully developed a version of API 6A valve for wellhead equipment and Christmas trees in the oil and gas field market of China. In dealing with the changeable pressures on wellheads, the body of the API valve can bare emergent unusal pressure and assist with super pressure. The seat margin has flow vortex groove with an inserted sealing design. The distorted sealing method guarantees that sealing ring will not break off, and the multi-path, labyrinthic structure can assist high-pressure impact and rush. Valves are normally sealed in low pressure by using vortex groove to avoid the sealing ring being impacted when valves begin to open. The inserted sealing material can bare the rush from high pressure fluid because it has been harden treated by special proceeding method. The stem has a muti-sealing structure and the stem secondary sealing is optional. The valves also offer environmental protection. All the scraps resulting from the procedure can be used again and the little wasted water can be filtrated and alleviated.
