why exhaust valve in the pipeline? What is the meaning of it?

sometimes have gas in the pipeline, or gas flows in the system, especially at first runs, there is the air, water, gas excluded, gas will be along the pipeline social climbers, and eventually gathered at the highest point of the system, and the exhaust valve is generally installed in the system, when the gas into the vent valve cavity gathered in the upper portion of the exhaust valve, with the increasing of the gas inside the Industrial Valves, pressure rise, when gas pressure is greater than the system pressure, the gas can make the cavity of the water drops, buoy with water level drops, open the vent; Gas, after the water level rise, buoy also rose, close the vent. Likewise, when negative pressure is formed in system, valve chamber in the water drops, vent open, because the outside atmospheric pressure is greater than the system pressure, so the atmosphere through the vent into the system, avoid the harm of negative pressure. Such as tighten exhaust valve cap on the valve body, stop exhaust exhaust valve, under normal circumstances, the bonnet should be in an open position. Exhaust valve can also be used with isolation valve, easy to the maintenance of exhaust valve.

the above is the meaning of the exhaust valve is.

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