vacuum valve, vacuum isolation valve flange, welding connection points two kinds, drive mode, which has two kinds of manual and electric. The valves are suitable for working temperature 425 ℃ and 550 ℃ or less, or less for water, steam or air as the working medium of piping, as the opening and closing device; Particularly suitable for power plant turbine condenser and vacuum negative pressure system, the vacuum insulated sealing function. Modified by the common manual gate valves, the difference is that the vacuum packing seal gate valves equipped with a vacuum sealing ring, have since the expansion pressure effect, better than ordinary gate valves of the gas seal performance. The valve is suitable for the working temperature of 425 ℃ or less ( Chrome molybdenum steel NKZ44Y type for 550 ℃ or less) , working medium is water, steam or air tube of the road, as the opening and closing device; Particularly suitable for power plant turbine condenser and vacuum negative pressure system, the vacuum insulated sealing function. (1) the vacuum seal packing chamber design, make the system from the atmosphere, has a good environmental performance; (2) material, the national related standards, materials of high comprehensive quality; (3) seal pair of advanced and reasonable, improve the sealing performance, long service life. (4) open-close part adopts parallel disc two-way elastic seal, friction small, opening and closing easy, convenient maintenance, reliable sealing, excellent performance; (5) stem through surface nitriding treatment and conditioning, with good corrosion resistance, abrasion resistance and wear resistance; 6 flange gasket adopts composite materials, large expansion coefficient, good airtight performance, reliable guarantee system from the atmosphere.

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