Temperature/pressure release valve for long tube trailer

Abstract

The invention relates to a temperature / pressure release valve for a long tube trailer. The temperature / pressure release valve comprises a valve base, a valve base, a valve body, a valve element, a fusible plug and a blasting needle; a fluid channel is formed inside a base body of the valve base, the exterior of one port of the fluid channel is fixedly connected to the valve body, and the other port of the fluid channel is a fluid inlet; the interior of the valve body is provided with a first cavity and a second cavity, a connecting channel is arranged in the center of the position between the two cavities, the fusible plug is fixedly connected to an upper port of the second cavity, the valve base is installed on a lower port of the first cavity, and a fluid outlet is formed on the second cavity; the valve element comprises a valve rod and a valve disc, the valve rod is installed in the connecting channel inside the valve body in a sealed manner, and the valve disc is connected to the valve rod through threads and is connected to the valve base in a sealed manner; and the blasting needle is further fixedly connected between the valve rod and the fusible plug and is located in the center of the second cavity. By means of the temperature / pressure release valve, the problem that the blasting pressure of a blasting sheet is unstable is solved, and the working condition that single temperature / pressure condition release cannot be achieved when the blasting sheet and the fusible plug are combined.

Description

technical field [0001] The invention relates to a safety relief device for a long-tube trailer, in particular to a temperature / pressure relief valve for a long-tube trailer. Background technique [0002] With the adjustment of the national energy policy and the society's emphasis on the living environment, the application of clean energy represented by natural gas and ammonia has increased dramatically, and a multi-type, multi-gas source and multi-pipeline gas supply and demand pattern has gradually formed. Long-tube trailers are currently special vehicles for medium and short-distance industrial gas transportation, and have been widely used in various fields due to their high efficiency, flexibility and convenience. [0003] Long-tube trailers (tube-bundle containers) loaded with large-capacity gas cylinders, as special mobile gas cylinders, have stricter safety and sealing performance requirements, so bursting discs or bursting disc-easy-to-melt plug combined relief device...

AI Technical Summary

Problems solved by technology

These two devices all have bigger disadvantages and risks in use

[0004] Problems with the simple bursting disc pressure relief device: Most of the bursting discs used for long-tube trailers are positive-arched bursting discs. Due to the single-piece, fragile metal structure and the particularity of the manufacturing process, the bursting discs cause fluctuations in ambient temperature and pressure. And the operational stability has a great influence on its burst pressure

Since the length of the long-tube trailer gas cylinders is mostly 12 meters or more, and the safety relief devices are installed at both ends of the gas cylinders, if the external fire source is concentrated in the middle of the gas cylinders and away from the safety pressure relief devices, it will easily cause fire. The internal pressure of the gas cylinder rises rapidly, but the fusible plug does not operate because it has not reached the failure temperature

Therefore, when the pressure of the gas cylinder reaches the pressure to be released but the temperature does not rise to the failure temperature of the fusible plug, the failure of the pressure relief device will cause a great safety hazard

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