Safety valve structure capable of avoiding impact of valve clack during opening and closing and method thereof

Abstract

The invention discloses a safety valve structure capable of avoiding impact of a valve clack during opening and closing and a method thereof. An upper buffer of the safety valve structure is fixed above a valve rod, a first piston is arranged at the bottom, and an inner cavity located above the first piston serves as a first oil cavity; a first oil conveying hole is formed in the side wall; and a lower buffer set comprises at least two lower buffers of the same structure, and all the lower buffers are located in a valve seat and evenly distributed. Second pistons are arranged at the tops of the lower buffers, and an inner cavity below the second pistons serves as a second oil cavity; and a second oil conveying hole is formed at the lower portion of the outer side wall, the first oil cavity, the oil conveying pipe and the second oil cavity jointly form a communicated buffering channel which is closed all the time, and the buffering channel is filled with buffering media. On the basis of ensuring that a safety valve is opened and closed in a short enough time, the impact of the valve clack to a guide sleeve in the opening stage and the impact of the valve clack to the valve seat in the closing stage are reduced, the service life of valve internals of the safety valve is prolonged, and impact damage in the opening and closing process of the safety valve is avoided.

Description

Technical field [0001] The present invention belongs to the field of valve structural design, and in particular to a safety valve structure and method thereof that avoids the impact of the valve flap when opening and closing. Background technique [0002] The safety valve is a normally closed state under external force. When the medium pressure in the device or the pipe exceeds a predetermined value, a special valve in which the medium is prevented from the medium to prevent the medium pressure exceeding the specified value. . There are two main categories: spring and lever. The spring type is the force of the sealing spring of the valve and the valve seat, which is the most widely used safety valve. The spring-type safety valve is quickly turned on after the pressure exceeds the tuning pressure, so as to achieve rapid emissions of overpressive media. Although the quick discharge overpressure medium has an important safety significance for the pipeline system or pressure vessel, ...

AI Technical Summary

Problems solved by technology

Although the rapid discharge of overpressure medium is of great safety significance for pipeline systems or pressure vessels, in most cases, due to the rapid opening speed of the safety valve, the valve clack will have a severe impact on other parts of the safety valve, which will instead This will lead to a decrease in the service life of the safety valve, and even cause deformation and damage to the valve trim, causing serious safety accidents

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