New nuclear safety valve

Abstract

The invention provides a novel nuclear safety valve. The novel nuclear safety valve is composed of a main valve, a main auxiliary valve, a main isolation auxiliary valve, an isolation auxiliary valve,relay valves, electromagnetic isolation valves, a filter, a travel switch of a main valve opening and closing position indicator and a corresponding pulse pipe, wherein the main valve is arranged atthe upper part; the two relay valves are arranged in the middle; the three auxiliary valves are arranged at the lower part. Each axis is vertical to the horizontal plane; the two electromagnetic isolation valves are arranged at two sides of the main valve respectively; one electromagnetic isolation valve is connected into the middle from an upper chamber of a main isolation piston to a pulse pipeof an outlet cavity of the main valve in series, and the other electromagnetic isolation valve is connected in the middle from a lower chamber of the main isolation piston to the pulse pipe of the outlet cavity of the main valve in series; the pulse pipe is used for connecting all the assemblies; the novel nuclear safety valve is mainly characterized in that a main valve clack and a main isolationvalve clack are connected, upper and lower springs of the main isolation piston are utilized, the isolation auxiliary valve is arranged and a reasonable overall structure design is adopted, and the safety valve has two driving mechanisms which are independently opened, three mechanisms which are independently and automatically opened and three mechanisms which are independently and automaticallycontrolled and isolated, so that the safety valve has very high opening and isolation reliability; the triple-insurance nuclear safety valve provides very reliable guarantees for preventing overpressure failure of a system and preventing dehydration of the system.

Description

technical field [0001] The invention relates to a safety valve, especially a new nuclear safety valve. [0002] The new nuclear safety valve is an important protection device in the overpressure protection system. [0003] There are two types of existing safety valves, direct acting safety valves and indirect acting safety valves. In terms of function, it is divided into safety function, isolation function and release function. Its isolation function and release function add an insurance to the closing and opening of the safety valve to improve the reliability of closing and opening. Background technique [0004] Since the accident that the overpressure release valve of the Three Mile Island Nuclear Power Plant was opened to release water vapor did not close, Western countries determined that the safety valve entering the nuclear island must have an isolation function to stop the release. Since then, my country's national scientific research institutes and some valve fact...

AI Technical Summary

Problems solved by technology

Sibim France adopts two single-function pilot-operated safety valves connected in series, one of which is opened at high pressure is used as a release valve, and the one opened at low pressure is used as an isolation valve. The temperature of the water is lower than 260 degrees Celsius, and a set of cooling equipment is equipped. Its volume and weight far exceed the weight and volume of the valve. It is said that although there have been some improvements, its performance is still unsatisfactory. It is necessary to purchase the valve , not only the price is expensive, but also the restriction of the "301" clause

The safety valve for nuclear use in my country's patent application No. 03135708.3 has design defects. When the system is heated up and boosted to the operating pressure and temperature, the isolation valve disc is always closed. At this time, an external energy source must be used to open the isolation valve disc. Safety Only the valve can be in normal working condition; my country’s patent application number: 201120026844.5 multi-functional nuclear safety valve design, due to the lack of interconnection between the main valve disc and the isolation valve disc, the auxiliary control valve cannot open the main valve disc in time to discharge the pressure medium, there are The problem of opening the pressure late, especially in the case of a large increase rate of overpressure

The shortcomings of the above two patents make the valve work poorly

Images