The valve is used in the negative pressure system. When the negative pressure in the negative pressure vessel system exceeds the allowable value, the valve will automatically open and suck in air; when the negative pressure drops to the specified value, the valve will automatically close to ensure the safe operation of the equipment.

Caliber 1 "~ 8" (DN25 ~ DN200)

Flange standards: ANSI B16.5, en1092, JIS, Hg / t20592 ~ 20615, GB / t9113, etc