Inclination leakage prevention breather valve used for fuel tank truck

Abstract

The invention belongs to the technical field of breather valves, and particularly relates to an inclination leakage prevention breather valve used for a fuel tank truck. The inclination leakage prevention breather valve comprises a breather valve body. According to the breather valve of the design, only when a fuel tank overturns by larger than 20 degrees, a structure composed of a balancing weight, an installation rod and an installation base can incline to drive a frame body and a sealing plate to swing, second gas holes formed in the sealing plate and first gas holes formed in a sealing cover are staggered in a one-to-one correspondence manner, a passageway between an installation sleeve and the breather valve body is closed, and the leakage prevention effect is achieved. When the inclination angle of the fuel tank is smaller than 20 degrees, due to the fact that the installation base is larger than the projection area of the balancing weight and the installation rod on the installation base, the structure composed of the balancing weight, the installation rod and the installation base cannot incline. According to the inclination leakage prevention breather valve, considering the situation that it is not easy to make the frame body and the installation rod reset, a reset mechanism is designed, and it is ensured that the installation rod and the frame body can conveniently reset.

Description

[0001] Technical field [0002] The invention belongs to the technical field of breathing valves, and in particular relates to an anti-tilt and leakage breathing valve used by oil pipe trucks. Background technique [0003] The breathing valve is composed of a pressure valve and a vacuum valve. It is installed on the vent pipe of the storage tank. It can automatically open and close with the change of the positive and negative pressure of the oil and gas in the storage tank, so as to keep the pressure difference between the inside and outside of the storage tank within the allowable range. [0004] The breathing valve is a safe and energy-saving product that maintains the air pressure balance of the storage tank and reduces the volatilization of the medium. The breathing valve makes full use of the pressure bearing capacity of the storage tank itself to reduce the discharge of the medium. The principle is to use the weight of the positive and negative pressure valve disc to cont...

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Problems solved by technology

[0005] When the oil tank is dumped, the breathing valve will leak because it cannot withstand the oil pressure, so the breathing valve needs to be sealed; the existing technology is to install a copper semicircular weight at the bottom of the valve. Under normal circumstances, the copper semicircular weight It is located at the bottom of the valve; when it is tipped, the weight is turned to seal the valve port under the action of weight; however, this technology is suitable for the situation where the oil tank is tipped over at a large angle, generally greater than 30 degrees; for small-angle tipping that occurs in reality Risks, such as when a fully loaded oil tanker goes up and down a slope or a side slope tipping angle is greater than 20 degrees but less than 30 degrees, and when a stationary oil-filled oil tank on the ground collapses after the ground collapses, the existing The anti-leakage technology cannot meet the anti-leakage requirements in this state, so it is necessary to design a breathing valve that can seal and not leak when tilted at a small angle

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