Safety accessories for pressure vessels

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I. Safety Valve A safety valve consists mainly of a sealing mechanism (valve seat and valve disc) as well as a loading mechanism (spring or weight, pilot valve). It is a special type of valve that is activated by the pressure of the medium on the inlet side to open the valve disc, allowing pressure to be released, after which it closes automatically; it belongs to the category of self-closing pressure relief devices. II. Burst disc device: The burst disc device mainly consists of a burst disc (a sensitive element that controls the bursting pressure) and a holder (which holds the burst disc in place to ensure sealing as well as stable bursting pressure). It is a device that allows for automatic pressure relief by causing the burst disc to rupture under the action of the pressure difference between the inlet and outlet media, and it belongs to the category of non-self-closing pressure relief devices. III. Fuse link: A fuse link utilizes a low-melting-point alloy contained within the device; at higher temperatures, this alloy melts and opens a passage, allowing gas to escape through the holes in the alloy, thereby releasing pressure. Its advantages include a simple structure and easy replacement, while the operating pressure, which is determined by the melting temperature, is relatively easy to control. IV. Emergency shut-off device: The emergency shut-off device generally consists of an emergency shut-off valve, a remote control system, and a fusible plug automatic shut-off mechanism. Its function is to quickly close the valve in case of leaks in the pipes and their accessories, as well as in the event of misoperations, or in case of a fire nearby the tank truck, thereby preventing the accident from spreading. V. Safety interlock devices for quick-opening pressure vessels. The safety interlock alarm devices for quick-opening doors are effective measures to prevent operational accidents in quick-opening pressure vessels. Its function is: a. an interlock control function that allows pressure to be increased for operation only when the fast-opening door reaches the predetermined closed position ； b. The interlock function for opening the quick-opening door can be activated only after the internal pressure of the pressure vessel has been completely released and the safety interlock device has been disengaged ； c. It has an alarm function that synchronizes with the aforementioned actions.