Bottom valve of tank truck

Abstract

The invention discloses a bottom valve of a tank truck. The bottom valve comprises a pipe, a switch assembly and a self-locking assembly. The left end of the pipe communicates with the interior of thetank truck. The bottom end of the pipe is in sealing assembly with a sealing head. The sealing head is fixed to the bottom of a valve rod in an assembly manner. The top of the valve rod penetrates through an air cylinder and is fixed to a top block in an assembly manner. An installation chamber is formed in the air cylinder. A sealing cover, a power disk and a reset spring are arranged in the installation chamber from top to bottom. The power disk is fixed to the valve rod in an assembly manner. The valve rod is sleeved with the reset spring, and the reset spring is arranged between the powerdisk and the bottom of the installation chamber. A pressure chamber is formed between the power disk and the sealing cover. The pressure chamber communicates with an air outlet of the switch assemblythrough a first air inlet pipe. The power disk is in sealing assembly with the installation chamber. According to the bottom valve of the tank truck, with the self-locking unit, the situation that the sealing head is automatically opened can be effectively avoided, and therefore, leakage is avoided; and additionally, the self-locking assembly and the switch assembly are in the relation of being opened in sequence, and are both automatically opened through air flow, and therefore, usage is quite convenient to carry out.

Description

technical field [0001] The invention relates to a valve, in particular to a bottom valve for tank cars. Background technique [0002] At present, when domestic oil tank trucks are filling the oil tanks, the operator fills them from the top of the oil tank. During the oil intake process, the gaseous oil in the oil storage tank is discharged to the outside, and the operator manually opens the tank when the oil is discharged. The bottom valve is used to add air to the oil storage tank to ensure the pressure balance of the oil tank. The whole process is cumbersome to operate, time-consuming and labor-intensive. [0003] Although there is a bottom valve driven by air pressure at present, this bottom valve lacks the necessary self-locking device. When the spring is damaged, the sealing head is easy to open under its gravity, causing leakage. [0004] Therefore, the applicant believes that it is necessary to design a bottom valve for tank trucks, which has a self-locking function....

AI Technical Summary

Problems solved by technology

[0002] At present, when domestic oil tank trucks are filling the oil tanks, the operator fills them from the top of the oil tank. During the oil intake process, the gaseous oil in the oil storage tank is discharged to the outside, and the operator manually opens the tank when the oil is discharged. The bottom valve is used to add air to the oil storage tank to ensure the pressure balance of the oil tank. The whole process is cumbersome and time-consuming.

[0003] Although there is already a bottom valve driven by air pressure, this bottom valve lacks the necessary self-locking device. When the spring is damaged, the sealing head is easy to open under its gravity, resulting in leakage.

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