The breathing valve is composed of a pressure valve and a vacuum valve. It is generally installed on the vent pipe of the cargo oil tank. It can automatically open and close with the positive and negative pressure of the oil and gas in the cargo oil tank, so that the air pressure difference between the inside and outside of the cargo oil tank is kept at an allowable value. Valves in range.
Performance and characteristics of breathing valve
The new pipeline flame arrester is made of: cast iron, cast steel, stainless steel, aluminum alloy, and has good corrosion resistance. The valve disc and valve sealing ring are made of stainless steel tetrafluoroethylene. Low temperature resistance, good antifreeze performance.
Selection of mechanical breathing valve
Requirements for the installation location and temperature range-all-weather breathing valves should be used in cold areas, and pipeline breathing valves should be used for installation in pipelines. The control pressure of the mechanical breathing valve should be compatible with the relevant pressure bearing capacity.
The role of breathing valve
It makes full use of the pressure-bearing capacity of the oil tank to reduce oil vapor emissions. Its principle is to use the weight of the valve disc to control the positive expiratory pressure and negative inspiratory pressure of the oil tank. When the pressure of the gas in the tank is within the control pressure range of the mechanical breathing valve, the breathing valve does not act to maintain the airtightness of the oil tank; when the pressure of the gas space in the tank rises and reaches the positive control pressure of the breathing valve, the pressure The valve is opened and the gas escapes from the tank, so that the pressure in the tank does not continue to increase; when the pressure in the gas space in the tank drops and reaches the control negative pressure of the breathing valve, the atmosphere outside the tank will open the vacuum valve and enter the tank Inside, so that the pressure in the tank no longer continues to drop.
Maintenance and maintenance of breathing valve
First open the valve cover slightly, take out the vacuum valve disc and the pressure valve disc, check the valve disc and the valve disc seal, the valve disc guide rod and the guide rod sleeve for oil and dirt, if there is oil and dirt should be removed Clean it, then put it back in place, and move it up and down a few times to check whether the opening is flexible and reliable. If everything is normal, then tighten the valve cover. In the course of maintenance and maintenance, if any abnormal phenomenon such as scratches or wear on the valve disc is found, it should be replaced immediately or contact the supplier company to solve it in time.