Vertical coaxial anti-explosion fire-retardant breather valve

Abstract

The invention belongs to fire-retardant ventilation equipment of a petroleum storage tank, which consists of an anti-explosion flame arrester and a breather valve. The flame arrester is positioned at the top and plays a role in preventing explosion first and then preventing fire. The top of a breather valve cavity consisting of a vacuum valve and a pressure valve is provided with a pressure cavity sealing guide sleeve cover. The vertical movement of a vacuum valve disk is restrained by a guide sleeve of the pressure cavity sealing guide sleeve cover, and the vertical movement of a pressure valve disk is restrained by a guide rail of the vacuum valve disk. The fire-retardant ventilation equipment has reasonable design. Particularly, the pressure cavity sealing guide sleeve cover at the breather valve further plays a role in blocking the breather valve and the anti-explosion flame arrester, effectively adds the functions of flame arrest and explosion prevention, and enhances the safety and reliability of the whole equipment. The vertical coaxial symmetrical mounting structure stabilizes the center of the equipment; and the pressure valve disk and the vacuum valve disk are stressed uniformly so as to prolong the service life of the equipment, reduce the maintenance frequency and the production cost, facilitate assembly and disassembly, facilitate the operation and maintenance of a tank top and improve the production efficiency.

Description

1. Technical field [0001] The invention belongs to the fire-blocking and ventilating equipment of petroleum storage tanks—a vertical coaxial explosion-proof fire-blocking breathing valve, which is installed on the petroleum storage tanks, can ensure fire-blocking ventilation, ensure that the internal pressure of the petroleum storage tanks is in a safe state, and can Reduce the evaporation loss of oil products. 2. Background technology [0002] According to the relevant national and industry standards, fixed storage tanks for Class A and B liquids should be equipped with flame arresters and breathing valves. Therefore, it can be seen that flame arresters and breathing valves are indispensable safety measures and equipment for storage tanks such as oil products or chemical products. The explosion-proof flame arrester is to prevent the flame outside the tank from entering to ensure the safety of the storage tank. The breathing valve can adjust and maintain the automatic bala...

AI Technical Summary

Problems solved by technology

Because the explosion-proof flame arrester is very close to the storage tank, condensation and blockage often occur due to the self-accumulation of the medium, the channel is not smooth, and the breathing valve does not work properly, so it is prone to safety hazards such as storage tank collapse

In addition, the above-mentioned explosion-proof and fire-resistant breathing valves are generally arranged horizontally or sideways, which will cause the overall center of gravity of the equipment to shift instead of the center of the fixed flange of the base, resulting in uneven pressure on the top of the storage tank. The loading and unloading or maintenance of the top of the tank is extremely inconvenient, it is difficult to clean sideways, and the operation of sideways maintenance and replacement of parts is difficult, which brings great hidden dangers to the operator's operation safety

[0003] Also provided in the prior art is an explosion-proof fire-stop breathing valve for oil storage tanks that integrates an explosion-proof flame arrester and a breather valve into one, which first fires and then breathes. The explosion-proof flame arrester of the valve and the pressure valve disc of the breather, Although the vacuum valve disc is coaxially arranged, the gas flow passages of the valve's "exhale" and "inhale" are set on the side of the valve body, so that the force on the pressure valve disc and the vacuum valve disc is in an uneven state for a long time. The guide rod is also in an uneven stress state, which will directly cause the guide rod to be biased or the side wear will cause the pressure valve and vacuum valve to fail earlier

In addition, the vacuum valve of this technology is on the bottom and the pressure valve is on the top, and the suction port of the vacuum valve is smaller than the exhalation port of the pressure valve, and the flow rate of the breathing port of the protective cover is very small, which is also one of the reasons for the collapse of the tank. This is a structural hidden danger that has been proven in the production practice of the same industry

In particular, in this technology, there are only screws on the vacuum disk seat and pressure disk seat without a pressure plate ring. Due to the long-term changes in winter and spring and the temperature change of the medium in the tank, the disk seat often deforms irregularly, resulting in pressure valve disk or The vacuum valve disc cannot achieve the sealing effect with the disc seat, which will inevitably cause the pressure valve disc or the vacuum valve disc to be in the normal open state at the same time or only one, and cannot perform the functions of "exhalation" and "suction", resulting in waste of media and equipment. scrapping

If the valve seat fails to be replaced, the site will not be able to operate correctly, and the level of the disc seat cannot be correctly determined, so the normal operation of the breathing valve cannot be guaranteed

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