Plug valves have been particularly desirable valves for shut-off use for many years. Plug ValvesHowever, as the size of the plug valve increases, oftentimes the amount of torque required to operate the valve also increases. In order to overcome this high torque requirement, a so-called rising- plug plug valve was developed. In a rising- plug plug valve, generally there is a mechanism provided which raises the frustoconical Plug Valves black;">plug from its seat, maintains the plug either out of contact with the seat or in very light contact with the seat, permitting the plug to be rotated using minimal torque. The plug is then seated by forcing it into the frustoconical seat. PLUG VALVESOften, such rising- plug plug valves are subject to substantial abrasion, particularly in the region of the plug adjacent its narrower end which engages the frustoconical cavity within the valve body. Generally, such rising- plug plug valves tend to accumulate particulate material carried by the liquid flowing within the valve in the cavity defined by the smaller diameter end of the plug and the valve body. Oftentimes such particulate matter abrades the sealing surfaces of the plug and valve body. Occasionally, such a particulate matter will accumulate to a sufficient extent that the plug can no longer be successfully seated.

MORE NEWS