The fire-resisting breathing valve acts as a steam-blocking and draining function in the steam heating system, and the fire-resisting valve selects a suitable breathing valve, so that the steam heating device can reach the highest working efficiency. In order to achieve the best results, we must fully understand the working performance of various types of breathing valves and the characteristics of fire-resisting breathing valves. There are many varieties of breathing valves, each with different properties. When using a breathing valve, first select the special performance to meet the optimal operation of the steam heating equipment, and then consider other objective conditions, so that the choice of the breathing valve you need is correct and effective. The breathing valve should be able to "recognize" the steam and condensate, and the fire-resisting valve can function as a vapor barrier. “Identification†Steam and condensate are based on three principles: density difference, temperature difference, and phase change.
The working principle of the fire-resisting breathing valve is to use the spring limit valve plate, which is determined by the positive and negative pressure or the suction or suction. The breathing valve should have the functions of positive pressure and negative pressure, specifically: when the container is under positive pressure, the breathing valve Open the exhaled gas to release the positive pressure; the fire-stop breathing valve, when the container is under negative pressure, the fire-stopping breathing valve opens the suction gas to release the negative pressure. This ensures that the pressure is within a certain range and the container is safe. One type of fire-resisting breathing valve is to make a call or aspiration when a certain pressure is reached. The other is designed to be purely no-sucking. It can be understood as replacing with a two-way one-way valve. The fire-stopping valve can not only maintain The tank pressure balance ensures that the tank is destroyed during overpressure or vacuum and reduces the media and losses in the tank. This type of valve should generally be installed horizontally in the pipeline.
The valve is fully utilized to reduce the oil vapor discharge capacity of the tank itself. The principle of the fire-resisting valve is to control the positive and negative suction pressure of the tank by the weight of the valve disc. 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 operate to maintain the tightness of the oil tank; when the pressure of the gas space in the tank rises to reach the positive pressure of the breathing valve, the pressure The valve is opened, and the gas of the fire-breathing valve escapes from the tank, so that the pressure inside the tank does not continue to increase; when the pressure of the gas space in the tank drops, and the negative pressure of the control of the breathing valve is reached, the atmosphere outside the tank of the fire-retardant valve The vacuum valve will be opened to enter the tank so that the pressure inside the tank does not continue.
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