What are the main criteria of gate valves

Gate is one of the commonly used block valves, is mainly used to connect or truncation pipeline medium, does not apply to adjust the medium flow. Gate valves are suitable for pressure, temperature and diameter range is very large, especially suitable for medium and large diameter pipeline. Gate valve is used as a cut-off media, through the entire circulation when fully open, the medium run minimal pressure loss. Its main standard was GB12232 - 2005 general valve flange connection iron gate, GB12234 - 2005 general valve flange and butt welding of steel gate valve, GB - 8464 1987 'female connection gate valve, globe valve, ball valve, check valve, general technical conditions', GB8465. 1 - 87 'internal thread connecting gate valve, globe valve, ball valve, basic size iron gate valve, check valve, JB/T 53162 - 1991 the gate valve product quality grading, JB/T 5298 - 1991 'pipeline with steel plate gate', JB/Z - 243 1985 'gate valve static life test procedures', JB/T Q648 - 88 iron wafer flat gate valve, JB/T 53200 - 1994 iron wafer flat gate valve product quality grading, JB/T 53242 - 1994 steel plate gate valve product quality grading, API 600 - 2001 the flange or butt welding steel gate valve, DLT - 531 1994 the plant conditions of high temperature and high pressure cut-off valve gate valve technology, JB/T 1739 - 1992 'the valve sealing surface spacing wedge gate valve body structure factors and wedge Angle size', JB/T 8691 - 1998 'the wafer knife gate valve', JB/T 8858 - '2004' gate valve static life test procedures.