Pressure vacuum vent is installed on the top of oil tanker,it used to maintain the inside and outside pressure of tank.Make it to keep balance,
positive pressure is 6-23Kpa,negative pressure is 2-6Kpa,max flow is 600L/Min.It can change pressure according to the need of customer. Use the high quality spring and seal material to improve the tightness and the service life.It also has the automatically close function.
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