Exclude Thermal Shock Safety Valve

Abstract

The invention discloses a thermal-shock-eliminating safety valve. The thermal-shock-eliminating safety valve is an indirect acting safety valve and belongs to overpressure protection equipment used for replacing an existing indirect acting safety valve which can hardly solve high-thermal-shock stress. When the safety valve opens to discharge a pressure medium, the pressure medium is in contact with some parts, and the parts in contact with the pressure medium are subjected to a thermal shock; and for the indirect acting safety valve with an forwards arranged main valve and an inversely arranged auxiliary valve, walls of an inlet chamber and an outlet chamber of the auxiliary valve, a pulse tube connected between the main valve and auxiliary valve, the cylinder wall of an upper chamber of amain valve piston and the like are inevitably in contact with the pressure medium flowing at high speed during a process of opening the safety valve and discharging the pressure medium, which all have thermal shock problems. The existing indirect acting safety valve cannot avoid the greatly increased thermal-shock stress caused by the increase of temperature, pressure and displacement of the pressure medium, the increase of thermal-shock temperature difference and the increase of wall thickness of a pressure-bearing tube, wherein the thermal-shock stress is directly proportional to the thirdpower of the wall thickness, and the increase of certain parameters can cause the thermal-shock stress to increase beyond an unallowable degree. The structure design of the thermal-shock-eliminating safety valve is mainly used for eliminating the thermal-shock temperature difference, and specifically the temperature of the shocked parts can be close to the temperature of the pressure medium as much as possible, so the thermal shock value tends to zero.

Description

technical field [0001] The present invention relates to safety valves, especially thermal shock exclusion safety valves. [0002] For existing power generation devices or power devices, water steam is used as the pressure medium. In order to improve the efficiency and power of the device, it is necessary to increase the temperature, pressure and steam production per unit time of the steam. High temperature, high pressure and high steam production will The indirect acting safety valve used for overpressure protection brings high thermal shock stress, and the indirect acting safety valve that eliminates thermal shock will become an indispensable overpressure protection device in power generation devices or power devices in modern society. Background technique [0003] There are four general structural forms of existing indirect-acting safety valves, one of which is an integral vertical formal structure, such as the EPRI NP-2292 Project V102 of "PWR Safely and Relief Valve Test...

AI Technical Summary

Problems solved by technology

[0007] The thermal shock elimination safety valve provided by the present invention belongs to the indirect action safety valve, which can solve the thermal shock stress problem that cannot be solved by the existing indirect action safety valve

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