Built-in type safety valve

Abstract

The invention relates to a built-in type safety valve. The built-in type safety valve comprises a valve body, a valve blade and a spring pressure setting device. The built-in type safety valve is characterized in that the valve blade is of a circular barrel type structure which is upwards opened, wherein a valve blade sealing surface which is salad to a valve seat sealing surface is arranged on the upper end surface of the circular barrel; the spring pressure setting device is mounted in an inner cavity of the circular barrel, and the spring pressure setting device comprises an adjusting sleeve, a piston, a piston rod and a spring; an inner hole of the adjusting sleeve is in sealing fitting with the outer circle surface of the piston rod; a sealed spring cavity is formed among the upper end surface of the piston, the lower end surface of the adjusting sleeve, the outer circle surface of the piston rod, and the inner wall of the circular barrel of the valve blade, and a spring is mounted in the spring cavity; a pressure chamber is formed between the lower end surface of the piston and the bottom part of the circular barrel of the valve blade, and the pressure chamber communicates with an inner chamber of a tank body through the center of the piston rod and a pressure guide hole in the valve body; and the spring cavity communicates with the outer side of the tank body through breathing holes in the piston rod and the valve body. The built-in type safety valve has the advantages of being long in service life, accurate in setting pressure, small in water hammer, reliable in sealing performance, and small in mounting space.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a built-in safety valve. The invention is suitable for the safety valve on the top of the tank car. Background technique [0002] The built-in safety valve is mainly installed on the top of the tank car, and the main parts of the safety valve are installed inside the tank body. When the existing built-in safety valve is installed on a tank truck, its spring and other main components are directly exposed to the medium, which is easily corroded by the medium, and has the disadvantages of short service life and inaccurate set pressure; at the same time, the safety of the structure The valve, whose valve disc is placed outside the tank, requires a large installation space, and the valve disc is easily damaged by external force impact, which affects the service life; and water hammer or water hammer occurs during the opening and closing process, resulting in greater vibration, vibration The im...

AI Technical Summary

Problems solved by technology

When the existing built-in safety valve is installed on the tank truck, its spring and other main components are directly exposed to the medium, which is easily corroded by the medium, and has the disadvantages of short service life and inaccurate set pressure; at the same time, the safety of the structure The valve, whose disc is placed outside the tank, requires a large installation space, and the disc is easily damaged by external impact, which affects the service life; and water hammer or water hammer occurs during the opening and closing process, resulting in greater vibration, vibration The impact is easy to damage the sealing surface and affect the sealing performance

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