Used in vacuum equipment, when the vacuum in the system exceeds allowed value, the valve automatically opens,breathe in the air; When the negative pressure to reduce to the specified value, the valve automatically shut down, so asto ensure the safety of the equipment.Design Features:◆Sizes available 1”~8”(DN25~DN200);◆The flanges are accordance with ANSI B16.5,HG/T20592、GB/T9113、JIS;◆Available Materials: Carbon Steel、Stainless Steel、Special Materials on Application;
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