Gate valve is a valve in a large amount, a gate is an opening and closing a gate, direction and perpendicular to the direction of flow of the gate valve can only be fully open and close, not to adjust and throttling. Gate Industrial Valves through the seat and disc contact seal, seal face often overlaying welding metal materials in order to increase wear resistance, such as welding 1 cr13, STL6, stainless steel, etc. Domestic manufacturer of gate valve, connection size are not unified. The main points of the following categories: 1, according to JB/T2203-1999 'gate structure length' production machinery standard valves; 2, according to GB/T12221 - 2005 'metal valve structure length' production of gb valve; 3, in accordance with the ASME B16. 10 - End-to-end dimensions of the valve face to face and 2009, the American standard valve production. Gate valves are used as a cut-off media, through the entire circulation when fully open, zui small pressure loss of the medium run and now. Gate valves are normally applied to don't need to often open/close, and keep the gate full open or full close condition. Is not suitable for use as regulating or throttling. For the high-speed flow medium, ram in local open conditions can cause the vibration of the gate, and vibration and possible damage of disc and seat sealing surface, and the throttling can make gate medium of erosion. From the structure form, the main difference is adopted in the form of packing element.
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