Double-control angle type safety valve

Abstract

The invention discloses a double-control angle type safety valve, and aims to solve the defects that a system is damaged or even security accidents are caused as the pressure inside the system is too high since an electronic control valve cannot be normally opened to release the pressure if the electronic control valve has power-off faults. The double-control angle type safety valve comprises a main valve, a mechanical guide valve and an electronic control valve, wherein a main valve inlet is formed in the lower end of the main valve; a main valve outlet is formed in a side of the main valve; the main valve inlet and the main valve outlet form an angle structure; a guide sleeve is mounted inside the main valve; a main valve clack is mounted inside the guide sleeve; a main valve cavity is formed above the main valve clack inside the guide sleeve; a pressure inlet cavity and a pressure release cavity are formed inside the mechanical guide valve; a pressure inlet hole, a pressure outlet hole and a pressure discharge hole are formed in the electronic control valve; the main valve inlet and the pressure inlet cavity are communicated through a pipeline; the pressure inlet hole and the pressure inlet cavity are communicated through another pipeline; the pressure outlet hole and the main valve cavity are communicated through another pipeline; the pressure discharge hole and the main valve outlet are communicated through another pipeline; the pressure inlet hole and the pressure outlet hole are at a normally communicated state; and the pressure discharge hole is at a normally closed state.

Description

Technical field [0001] The invention relates to a safety valve, more specifically, it relates to a double control angle safety valve. Background technique [0002] Safety valves are widely used in various fields of industrial production and play a good role in protecting the system. When the pressure of the system exceeds the set pressure, the safety valve opens to relieve the pressure of the system to prevent the pressure in the system from continuing to rise and damage the system. It even causes a safety accident. When the system pressure drops, the safety valve returns to its seat to prevent the continued discharge of the medium in the system. In order to facilitate precise control, electric control valves are often used to control the system pressure. The electric control valve accepts remote DCS valve opening and closing signals, but the electric control valve cannot be separated from the electricity. When a power failure occurs, the electric control valve cannot be normal ...

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the problem that the electric control valve cannot be normally opened to release pressure when the electric control valve has a power failure, which will lead to excessive pressure in the system and damage the system, and even cause safety accidents, and provides a double control angle safety valve , the safety valve is double-controlled by an electric control valve and a mechanical pilot valve. Even if there is a power failure, the main valve can open and release pressure normally, ensuring the safety pressure in the system, preventing the system from being damaged due to excessive pressure in the system, and avoiding damage caused by the pressure in the system. It is too high to cause a safety accident; there is no need to shut down the operation during the maintenance of the safety valve, which ensures normal industrial production and avoids economic losses

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