Mechanical breather valve of vault oil tank

Abstract

The invention relates to the technical field of valves of oil tanks, and discloses a mechanical breather valve of a vault oil tank. The mechanical breather valve comprises a valve body casing; a negative-pressure valve seat is mounted on the front side of an inner cavity of the valve body casing; a negative-pressure valve plate is movably clamped in the inner cavity of the valve body casing and located above the negative-pressure valve seat; a first moving clamping column is fixedly connected at the top of the negative-pressure valve plate; and a positive-pressure valve seat is mounted on thefront side of the inner cavity of the valve body casing and located below the negative-pressure valve seat. According to the mechanical breather valve of the vault oil tank, an oil tank communicatingseat as well as an upper cylindrical film, a lower cylindrical film and an oil storage cavity mounted in the oil tank communicating seat is arranged at the bottom of the valve body casing, so that oilvapor at the oil tank cannot pass through the upper cylindrical film, and then the oil vapor cannot be volatilized; meanwhile, the outside air can enter the oil tank, then the oil tank can have the respiratory action, the oil vapor and the air can pass through the lower cylindrical film, and then the oil vapor is liquefied and stored in the oil storage cavity.

Description

technical field [0001] The invention relates to the technical field of oil tank valves, in particular to a mechanical breather valve for vaulted oil tanks. Background technique [0002] The mechanical breathing valve is an important accessory to protect the safety of the oil tank. It is installed on the top plate of the oil tank. Its function is to keep the airtightness of the oil tank under normal circumstances and reduce the evaporation loss of oil products to a certain extent. , it can automatically ventilate and adjust to balance the internal and external pressure of the oil tank, which plays a safe role in the oil tank. [0003] When the oil tank breathes, a large amount of mixed oil and gas will overflow when the valve body is opened, which will cause a large amount of oil and gas to volatilize into the air, resulting in a large amount of oil waste. When encountering an open flame at a long distance, there will also be a safety hazard. At the same time, when the exter...

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Problems solved by technology

[0003] When the oil tank breathes, a large amount of mixed oil and gas will overflow when the valve body is opened, which will cause a large amount of oil and gas to volatilize into the air, resulting in a large amount of oil waste. When encountering an open flame at a long distance, there will also be a safety hazard. At the same time, when the external air enters the inside of the oil pipe through the respiration of the breathing valve, impurities in the air, such as water vapor, dust, etc., will enter the inside of the oil tank, which will cause When the oil in the oil tank is polluted and the quality becomes low, although some mechanical breathing valves can block the volatilization of oil and gas, a large amount of volatilized oil and gas cannot be collected and cannot be recycled

[0004] The currently used mechanical breathing valve is sealed with a ring-shaped smooth gasket during use. This sealing method requires a relatively large sealing pressure to perform better sealing. The positive pressure valve plate and the negative pressure valve plate are used for sealing. During the sealing process, the sealing pressure is not large, which makes the sealing effect not good, easily leads to the loss of oil products, and makes the control effect of the breathing valve worse

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