Pipeline breathing valve uses and instructions 1, this form of pipe breathing valve for all types of vertical tank for breathing the size of the can be installed in the tank top or pipe. 2, the scope of work: positive pressure of 100mmH2O, negative pressure of 30mmH2O. Positive pressure can be used to adjust the weight, negative pressure adjustable vacuum springs. 3, the breathing valve can be directly mounted on the top of the ground tank and semi-underground tank, installed in the semi-underground tank, the outlet elbow leads to the ground, the canister can be installed in the ventilation pipe. Pipeline breathing valve technical requirements: 1, positive pressure valve plate and vacuum valve plate, seal the contact surface should be smooth, tight, without any defects. 2, the valve plate and the pressure weight error does not exceed ± 20 grams. 3, the sealing ring sealing surface should be perpendicular to the centerline of the guide rod, the basket straightness should not be greater than 0.08mm. 4, the valve disc with the roundness and its centerline of the guide rod is not greater than the centerline of 0.05mm. 5, the valve disc in the guide rod can move freely, there should be no tilt and jamming phenomenon. 6, the product before the positive pressure, negative pressure should be tight test, after passing the factory. Pipeline breathing valve maintenance and care: 1, the respiratory valve should be regularly checked each year to check the pressure plate and negative pressure plate movements are flexible, guide rod and seal ring contact surface damage. 2, re-install the positive pressure plate and negative pressure plate, should ensure a combination of tight, flexible guide rod movements. 3, but also should adjust its work pressure.