Pressure balanced inverted conical plug valve, the valve plug by the bolt to adjust its position, and the sealant is injected into the valve stem from the end of the body. In order to prevent the media pressure will be pushed into the valve seat plug, the valve opening end of a balanced hole, and the small hole in the valve plug with a medium only to the end of the small head check valve, which allows medium pressure Into the cavity at both ends of the plug. This valve seal is also achieved by the sealant between the valve plug and the valve body. This design allows this plug valve for high pressure, up to C12500 level. At this time, the valve plug can not be pushed to the valve seat conical surface due to the medium pressure and can not be operated. Achieving such high pressures while maintaining the seal depends primarily on the machining accuracy and surface roughness of the plug and valve seal faces. Valve plug and valve body sealing surface taper to be exactly the same, and the value of the surface roughness must be in R. 0.4 below, and then injected into the sealing grease to ensure that the sealing requirements. Search Keyword: More Valve Technical Articles