First, the use of pipeline breathing valve and instructions for use
1. This type of pipeline breathing valve is suitable for all types of vertical oil tanks, for large and small breathing, and can be installed on the top of the tank or on the pipeline.
2. Working range: positive pressure is 100mmH2O, negative pressure is 30mmH2O. The positive pressure can be adjusted by the weight, and the negative pressure can adjust the vacuum spring.
3. The breathing valve can be directly installed on the top of the ground tank and the semi-underground tank, installed on the semi-underground tank, the outlet bend pipe leads out of the ground, and the hole type tank can be installed on the ventilating pipe.

Second, the pipeline breathing valve technical requirements
1. The contact surface of the positive pressure valve disc and the vacuum valve disc and the sealing ring should be smooth and tight without any defects.
2. The error between each valve disc and pressure is not more than ±20 grams.
3. The sealing plane of the sealing ring should be perpendicular to the centerline of the guide rod, and its straightness should not be greater than 0.08mm.
4. The roundness of the valve disc and its different center of gravity to the center line of the guide rod are not more than 0.05mm.
5. The valve disc can move freely on the guide rod, and there should be no inclination and jamming.
6, before the product leaves the positive pressure, negative pressure should be rigorous test, qualified before leaving the factory.

Third, pipeline breathing valve maintenance and maintenance
1. The breathing valve should be inspected regularly every year to check whether the pressure plate and the negative pressure plate are flexible, and whether the contact surface of the guide rod and the sealing ring is damaged.
2. Re-install the positive pressure plate and the negative pressure plate, which should be tightly combined and flexible.
3, should also adjust its work pressure.