... has union, thread and so on. The specification is 1",2",3",the rate working pressure is 42MPa, 70MPa, 105MPa(6000,10000, ... .2. Without removing from the pipeline, it is necessary to replace the reliable seal between square seal ring when the valve body seal should be ... cock cover shows clearly the valve is entirely opened or closed,which can limited the valve on the required position. Plug Valve ...