Parker YG series valves are Y pattern globe valves that are widely used in the power industry, petroleum,and chemical/petrochemical industries. With a maximum operating pressure of 414bar(6,000psi) and a maximum operating temperature of 676℃(1,250°F), the YG series valves are designed with a combined bonnet design to provide a stable sealing under high temperature and high pressure demanding working conditions. Two-stage stem/non-rotating head design effectively reduces the wear and tear caused by rotary motion on packing and seat, thus extending the packing and seat life and reducing operating torque. In addition, the packing is located below the stem thread, can prevent the thread lubricant contamination process medium, and also can remove the process medium to the lubricant erosion, thus effectively improve the lubrication effect of stem thread.