Breathing pneumatic valve structure principle and maintenance

breathing pneumatic valve structure and working principle of breathing pneumatic valve is important to protect the safety of oil tank accessories, installed in the oil tank on the roof of the pneumatic valve and vacuum pressure pneumatic valve in two parts. Its role in the general case, keep the tank sealing, to a certain extent, reduce the evaporation loss of oil product. And, when necessary, can adjust the balance tank internal and external pressure, automatic ventilation safety for oil tank.
when tank pressure is greater than the tank to allow oil and gas, the oil vapor pressure pneumatic valve to escape, vacuum pneumatic valve closed at this time; When the tank pressure is less than oil and gas tank allows vacuum, fresh air through vacuum pneumatic valve into the tank, pressure pneumatic valve closed at this time, allowing the pressure ( Or the weight of the vacuum pressure by adjusting plate to control.
the use of breathing pneumatic valve maintenance
mechanical breathing pneumatic valve common faults mainly include: flat, stuck, adhesion, jams, freeze and pressure pneumatic valve and vacuum pneumatic valve normally open, etc.
and air: general is due to corrosion, good thing cut pneumatic valve and pneumatic valve plate of interface, pneumatic valve disc or pneumatic seat deformation and pneumatic valve plate guide rod tilt causes such as.
and stuck: in by breathing in pneumatic valve installed incorrectly or tank deformation in pneumatic valve disc guide skew and under the condition of pneumatic valve stem rust, pneumatic valve seat can be available in the up and down along the guide bar, pneumatic valve tray card to guide a certain area.
, adhesive: because oil steam, water and sediment in the pneumatic valve, pneumatic valve seat, the dust and other sundry on the guide bar mixing chemical physical changes, over time,
the pneumatic valve and pneumatic seat or guide rod sticking together.
and jam: is mainly due to the mechanical breathing pneumatic valve not maintenance use for a long time, causing the dust, rust, slag and other sundry deposit on the pneumatic valve inside breath or breathing tube, and the bees or bird nest in pneumatic valve mouth breathing, breathing pneumatic valve block.
and freeze: because of temperature change, the moisture in the air in the breathing of the pneumatic valve pneumatic valve, pneumatic valve, pneumatic valve seat and condensation in areas such as the guide, and ice, pneumatic valve is difficult to open it.
these failures, some make use of pneumatic valve to control pressure can't action, tank overpressure caused endanger tank safety; Others lose respiratory pneumatic valve, causing size breathing out of control, the evaporation loss of feed increases, the oil quality to drop, increase regional air pollution, can affect the health of the operator body, increase the regional risk factors.
in every time routine check library and operation, to strengthen from the phenomenon of appearance and test analysis, timely find problems and solve in time. Such as tanks and tank breathing pneumatic valve pneumatic valve with or without abnormal changes; When in and out of the oil tank, breathing pneumatic valve operation is normal; U type pressure gauge pressure gauge is normal; The seal if there is any breakage, was clear; Underground structure pipeline oil tank breathing pneumatic valve pneumatic valve body presence of air leakage, etc.
also regularly for breathing pneumatic valve for a comprehensive inspection maintenance. For ground tank and semi-underground tank installations of mechanical breathing pneumatic valve, a check twice a month, four quarter ( Prevent freezing, second and third quarter check once a month. For installation in the underground structure of mechanical breathing pneumatic valve, check once every six months.