Leakless safety valve

Abstract

The present invention is a protection equipment to prevent reactor loop and other non-nuclear system from overpressure, and the valve includes pressure-resisting valve body, spring pressure system acting on clack to maintain sealing, movable piston sealed by metal diaphragm, spring, adjusting screw for pre-fastening spring,etc. The valve is opened and closed automatically under the direct action of pressure medium, or it may be also forced to open and close by means of gas source or electric power. It has no supplementary valve and is simpler and more reliable than available guide safety valve. Being good in performance and long in service life, it may be widely used in both nuclear and non-nuclear systems.

Description

1. Technical field [0001] The invention relates to a safety valve, especially a novel non-leakage safety valve. [0002] The safety valve is an essential overpressure protection device for all pressure vessels or systems with variable pressure media inside. [0003] The purpose of the present invention is to provide a safety valve which can be used in the nuclear reactor overpressure protection system using light water as the coolant, and can be widely used in non-nuclear systems. It has no auxiliary valve, and there is no first leakage interval, so it is a new type of non-leakage safety valve. The whole device has good reliability, long service life, simple structure and convenient manufacture, so that it has better overpressure protection effect. 2. Background technology [0004] There are two types of existing safety valves: direct-acting safety valves and indirect-acting safety valves. In terms of functions, they are divided into safety functions and release functions....

AI Technical Summary

Problems solved by technology

[0009] The indirect-acting safety valve disclosed by the American Electric Power Research Institute in the final report of "PWR Safety and Relief Valve Test Program" EPRI-NP2292 Project V102 in December 1982; my country applied on March 16, 1987 (patent number: 87101900) Although the guided safety valve has solved the problem of the first leakage of the auxiliary valve, there is a serious defect that the auxiliary valve has a high requirement for the purity of the pressure medium, which cannot contain solid particles, even tiny particles, caught in the The sealing surface of the auxiliary valve will cause leakage of the auxiliary valve, and the large leakage will cause the main valve to fail to close, causing water loss in the primary circuit of the reactor, and the danger of burning the core.

The indirect-acting safety valve, which uses an auxiliary valve to control the opening of the main valve, has high requirements on the water quality in the protected system. Japan is not interested in it. In addition, the indirect-acting safety valve has a complex structure, strict manufacturing process requirements, and high cost. High, so it is difficult to promote the use in non-nuclear systems, especially non-nuclear systems with poor water quality

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