肯特阀门

The LFH-I American standard breathing valve is installed on the top of the storage tank to solve the problem of positive and negative pressure gas inside the tank, so that the liquid in and out of the tank is not obstructed. When the external liquid enters the tank, a large amount of gas is called positive pressure. When the liquid inside the tank is output to the outside, it must be sucked into the tank from the outside air (called negative pressure). If the breathing valve automatically closes when it stops working, it will not leak the liquid and gas inside the tank, which ensures the quality of the liquid inside the tank.

 

Working principle of LFH-I American standard breathing valve

 

When the pressure of the medium in the tank is within the controlled operating pressure range of the LFH-I American standard breathing valve, the breathing valve does not work to maintain the airtightness of the oil tank;

 

When the LFH-I American standard breathing valve is filled with medium to increase the pressure in the upper gas space of the tank, reaching the operating positive pressure of the breathing valve, the pressure valve is pushed open, and gas escapes from the exhalation port of the breathing valve, preventing the pressure in the tank from continuing to increase; The atmosphere outside the tank will push open the negative pressure valve disc of the breathing valve.

 

A detailed introduction to the working principle of LFH-I American standard breathing valve

 

American standard breathing valve respiratory emission calculation

 

The respiratory emissions of a fixed top tank can be estimated using the following equation to determine the amount of pollutants emitted:

 

LB=0.191 x M (P/(100910-P)) ^ 0.68 x D ^ 1.73 x H ^ 0.51 x △ T ^ 0.45 x FP x C x KC

 

In the formula: LB - respiratory emission of fixed top tank (Kg/a);

 

M - molecular weight of vapor inside the storage tank;

 

P - True vapor pressure in a large liquid state (Pa);

 

D - diameter of the tank (m);

 

H-average vapor space height (m);

 

△ T - Average temperature difference within a day (℃);

 

FP coating factor (dimensionless), with values ranging from 1 to 1.5 depending on the paint condition;

 

C - Adjustment factor for small diameter tanks (dimensionless); Can bodies with a diameter between 0 and 9m, C=1-0.0123 (D-9) ^ 2; C=1 for tanks with a diameter greater than 9m;

 

KC - Product factor (petroleum crude oil KC=0.65, other organic liquids=1.0)