Two-stage pressure-control overflow-preventing breather valve

Abstract

The invention relates to a two-stage pressure-control overflow-preventing breather valve. An exhaust valve core is pressed on an exhaust valve seat by an exhaust valve spring; the bottom end of the exhaust valve seat is fixed with the top end of a float lever through a connecting rack; a floating bowl is movably matched with the float lever through a center hole of a top plate and a center hole of a base plate; floating bowl springs of which two ends are respectively supported against the top plate and the base plate are sleeved on the float lever in the floating bowl; the base plate of the floating bowl is a moving plate; an air flue is arranged at the upper end of the float lever and is used for communicating a top hole on the float lever with a side hole; and when the floating bowl rises along the floating lever, the side hole is positioned in the floating bowl. With the structure, the two-stage pressure-control overflow-preventing breather valve has the advantage of simple structure; and the breathing level and the safety level are improved and the overflow-preventing effect is also achieved.

Description

technical field [0001] The invention relates to a breathing valve, in particular to a two-stage pressure control anti-overflow breathing valve with anti-overflow and two-stage breathing functions. Background technique [0002] Tanks or containers for storing and transporting liquids are generally isolated from the outside atmosphere, but in order to prevent the tanks or containers from being deflated due to low pressure or bursting due to high pressure, a breathing valve is required to ensure that the tanks or containers pressure value inside. [0003] Breathing valves in the prior art include spring-type breathing valves, steel ball-type breathing valves, dumping anti-overflow breathing valves and dumping anti-overflow breathing valves with tilting for off-road oil tank trucks. [0004] The spring type breathing valve works like this --- when the tank is filled with oil from the bottom of the tank or the temperature in the tank rises, the pressure in the tank increases, an...

AI Technical Summary

Problems solved by technology

To a certain extent, it needs to realize the function of breathing and anti-overflow at the same time, but when the oil tank is tilted, it cannot realize the anti-overflow function, and there are still potential safety hazards

[0008] To sum up, the anti-overflow breathing valve in the prior art cannot effectively solve the problem of oil spillage of the oil tanker on inclined or steep roads. When the oil tank rolls over, it is impossible to prevent the oil in the tank from overflowing from the breathing valve. , therefore, the anti-overflow breathing valve of the prior art does not fundamentally solve the problems of breathing and anti-overflow, and there is a serious potential safety hazard

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