A reliable emergency cut-off device for low temperature flammable medium tank valve high temperature environment

Abstract

The invention discloses a reliable emergency cut-off device of a valve in a high-temperature environment for a low-temperature flammable medium tank. The device comprises a cut-off valve body, wherein a valve body inlet inner cavity connected to the outlet of a low-temperature medium storage tank and a valve body outlet inner cavity connected to a low-temperature medium conveying pipeline are arranged in the valve body; the inlet inner cavity and the outlet inner cavity communicate through a connecting channel; a valve clack which is arranged on the inlet inner cavity side of the valve body is driven by a piston rod to block or open the connecting channel, and a sealing member is arranged on the valve clack; a temperature-controlling channel is further arranged on the valve body, the temperature-controlling channel communicates with the inlet inner cavity of the valve body and is connected to a deflating pipeline, and a deflating valve is arranged on the deflating pipeline. The device disclosed by the invention is simple in structure and effective, and avoids severe consequences caused by failure of an emergency cut-off valve. Furthermore, besides a main valve, the structure of the device disclosed by the invention is further suitable for any one valve connected to the low-temperature storage tank, for example, a fullness measuring valve and an instrument valve.

Description

technical field [0001] The invention belongs to the field of valves, and in particular relates to a reliable emergency cut-off device for high-temperature environment of a low-temperature flammable medium tank valve. Background technique [0002] Commonly used low-temperature emergency shut-off valves are suitable for cutting off the medium in emergency situations on low-temperature storage tanks to avoid leakage of low-temperature liquid in storage tanks. Low-temperature emergency shut-off valves mainly rely on the disc at the bottom of the valve stem to control the fluid. When the gas is under pressure, the piston in the cylinder rises to drive the valve stem to rise to open the valve. When the gas in the cylinder is released, the piston in the cylinder drives the valve stem and the disc to move downward under the action of the spring, and the disc seal presses the valve seat , the valve is closed; therefore, as a safety device, the fusible plug of the emergency cut-off va...

AI Technical Summary

Problems solved by technology

[0002] Commonly used low-temperature emergency shut-off valves are suitable for cutting off the medium in emergency situations on low-temperature storage tanks to avoid leakage of low-temperature liquid in storage tanks. Low-temperature emergency shut-off valves mainly rely on the disc at the bottom of the valve stem to control the fluid. When the gas is under pressure, the piston in the cylinder rises to drive the valve stem to rise to open the valve. When the gas in the cylinder is released, the piston in the cylinder drives the valve stem and the disc to move downward under the action of the spring, and the disc seal presses the valve seat , the valve is closed; therefore, as a safety device, the fusible plug of the emergency cut-off valve is installed on the outer wall of the cylinder. If a fire occurs, the temperature of the cylinder wall will be heated to about 80 degrees and the fusible plug will melt. If the fusible plug melts for a long time, emergency The shut-off valve cannot close quickly, which is not good for protecting the valve body seal

[0003] At this time, there is no emergency cut-off valve in front of the full test valve, instrument valve, and safety valve of the storage tank. Gas leaks in these places, or other external fire sources burn to the emergency cut-off valve seat, or the fusible plug fails, etc., and the flame burns to The heat of the valve seat is transmitted to the PTFE seal of the valve disc, and the seal is damaged by heat. The medium in the storage tank breaks through the seal and leaks outward under pressure, causing the emergency shut-off valve to fail and a large amount of liquid to leak out. occur, these leaks will cause more harm

Therefore, the congenital deficiency of the emergency shut-off valve has caused the hazard of emergency failure to exist for many years, which seriously endangers the safety of the facility.

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