A liquid-sealed safety breathing valve capable of positive pressure backflow

Abstract

The invention relates to the field of oil-gas storage and transportation, in particular to a liquid seal safety respiration valve capable of achieving positive pressure backflow. The liquid seal safety respiration valve comprises a breather pipe assembly, a liquid isolation barrel assembly, a bottom plate assembly, an upper end cover plate assembly and an outer wall assembly. The upper end cover plate assembly and the bottom plate assembly are mounted at the upper end and the lower end of the outer wall assembly separately, a cavity is formed, the breather pipe assembly penetrates through the bottom plate assembly to be inserted into the cavity and is fixedly connected with the bottom plate assembly, the liquid isolation barrel assembly is arranged on the portion, located on the inner side of the cavity, of the outer side of the breather pipe assembly, a positive pressure liquid accumulation plate is arranged on the inner side of the liquid isolation barrel assembly, and a backflow pipe which communicates with the upper end and the lower end of the positive pressure liquid accumulation plate and penetrates through the bottom of the liquid isolation barrel assembly is arranged on the positive pressure liquid accumulation plate. Automatic backflow of sealing liquid is achieved, complete sealing without leakage in a non-respiration state can be achieved, the situation that when the positive pressure of the liquid seal safety respiration valve exceeds the limit, the sealing liquid splashes out of the liquid seal safety respiration valve, and a platform on the top of a petroleum storage tank is contaminated can be avoided, and the function of automatic reset during positive pressure limit exceeding is achieved.

Description

technical field [0001] The invention relates to the field of oil and gas storage and transportation, in particular to a liquid-sealed safety breathing valve capable of realizing positive pressure backflow. Background technique [0002] The hydraulic safety valve is an important accessory to protect the safety of the storage tank in the petroleum storage and transportation system. It belongs to the category of automatic valves. The main structure and use requirements of the valve. The traditional hydraulic safety valve is used together with the mechanical breathing valve, and its opening pressure is set higher than that of the mechanical breathing valve, so it does not open when the mechanical breathing valve is working normally, and serves as a second protection function. The liquid-sealed safety breathing valve is usually installed on the top of the oil tank, and is used to replace the mechanical breathing valve to realize the breathing function of the oil tank when the me...

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Problems solved by technology

[0003] Due to the internal structure of the existing traditional hydraulic safety valves used in oil tanks and other containers, when the positive pressure is opened, the pressure inside the tank will push the hydraulic pressure inside the hydraulic safety valve out of the valve, and open the ventilation channel to achieve ventilation. When the sealing liquid After being pressed out of the valve, the channel remains in a long-pass state and loses the sealing function, and the sealing fluid needs to be replenished manually, and the maintenance workload is huge

At the same time, when part of the sealing liquid in the valve is lost, the opening pressure of the traditional hydraulic safety valve decreases, which may open before the opening of the breathing valve, resulting in a decrease in the sealing pressure of the oil tank, resulting in an increase in leakage

Moreover, the sealing fluid directly splashed onto the top platform of the oil storage tank will cause environmental pollution and safety problems, and bring a lot of inconvenience to the maintenance of the oil storage tank system

[0004] To sum up, due to functional positioning and structural reasons, traditional hydraulic safety valves have problems such as loss of sealing fluid that leads to opening pressure offset, large maintenance, unknown operating status, and environmental pollution.

Aiming at the main shortcomings of traditional hydraulic safety valves, there are existing patents to realize the collection and return of sealing liquid in the valve by setting up positive pressure liquid accumulation tanks and opening a number of oil return holes at the bottom of the tanks. However, due to the use of ventilation channels as return channels, resulting in Sealing liquid and air flow are mixed and entrained, which cannot fundamentally solve the problem of sealing liquid loss and splashing

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