Adjustable-flow pilot-operated type safety valve with induction tube

Abstract

The invention relates to an adjustable-flow pilot-operated type safety valve with an induction tube. The adjustable-flow pilot-operated type safety valve comprises a main valve and a guide valve. The guide valve comprises a guide valve body, a guide valve seat, guide valve discs, a guide valve rod, a guide valve cover and a pressure setting device. The guide valve discs are composed of an inner valve disc and an outer valve disc. The outer peripheral face of the upper end of the outer valve disc is matched with the inner peripheral wall of the guide valve cover in a dynamic manner. The lower end face of the outer valve disc is provided with a sealing face matched with the upper end face of the guide valve seat. The sealing face of the outer valve disc is provided with a radial boss. An outer spring is arranged between the upper boss face of the radial boss and an inner boss face of the guide valve cover. The outer cylindrical face of the inner valve disc is arranged in a center hole of the outer valve disc in a dynamic fit manner. A pressure induction tube is arranged between a main valve disc and the inner valve disc. The adjustable-flow pilot-operated type safety valve has two-stage discharging functions of low discharging and high discharging, the discharging sensitivity is good, and the loss of discharging media is less.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a pilot safety valve. Background technique [0002] The pilot-operated safety valve is composed of a main valve and a pilot valve. The inlet of the pilot valve is connected with the inlet of the main valve through a pipe, and the outlet of one end of the pilot valve is connected with the piston chamber of the main valve through a pipe. When the set pressure value is set, the medium pressure is transmitted to the pilot valve disc through the pipe, and the pilot valve is opened to release the medium in the piston chamber of the main valve. The medium pressure at the inlet of the main valve pushes the main valve disc to open and discharge pressure. When the medium pressure on the inlet side of the valve suddenly rises, the medium pressure cannot be transmitted to the pilot valve instantly, and the discharge sensitivity is poor; when the pilot valve is opened, the main valve must be driven to o...

AI Technical Summary

Problems solved by technology

[0002] The pilot-operated safety valve is composed of a main valve and a pilot valve. The inlet of the pilot valve is connected with the inlet of the main valve through a pipe, and the outlet of one end of the pilot valve is connected with the piston chamber of the main valve through a pipe. When the set pressure value is set, the medium pressure is transmitted to the pilot valve disc through the pipe, and the pilot valve is opened to release the medium in the piston chamber of the main valve. The medium pressure at the inlet of the main valve pushes the main valve disc to open and discharge pressure. When the medium pressure on the inlet side of the valve suddenly rises, the medium pressure cannot be transmitted to the pilot valve instantly, and the discharge sensitivity is poor; when the pilot valve is opened, the main valve must be driven to open, and the medium loss is large; the opening height of the main valve disc and the opening and closing pressure difference cannot be adjusted

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