High temperature and high pressure spring safety valve with thermal compensation and elastic compensation sealing surface

Abstract

The invention discloses a high-temperature and high-pressure spring safety valve with a heat compensation and elastic compensation sealing surface. A valve flap of the valve consists of a heat valve flap and a valve flap body, wherein a heat compensation part, an elastic compensation part and an anti-clamping structure are arranged on the valve flap, the upper end of a steam discharge chamber is provided with a steam escaping structure, the valve body and a spray nozzle adopt a split assembly structure, the valve flap adopts a more reasonable back pressure inlet structure, the valve rod and the valve flap adopt a hard alloy steel ball jacking and pressing structure, a support frame adopts an integral casting structure with a valve rod for guide, and the valve is also provided with a structure convenient for in-site disposition. The high-temperature and high-pressure spring safety valve has the main advantages that better heat compensation and elastic compensation capability is realized, the sealing reliability of the valve can be improved, the occurrence of the front leakage phenomenon can be effectively delayed, an elastic deformation gap cannot be easily clamped and blocked, no steam escapes out from the upper end of the steam discharge chamber, the reliable work of the spring can be ensured, the sealing surface is convenient to restore and grind during the repair, the valve installation, the boiler water pressure test and the valve checking are more convenient, and the in-site treatment can be easily realized when the valve generates certain leakage.

Description

technical field [0001] The invention relates to a valve structure, in particular to a product structure of a high temperature and high pressure spring safety valve for power stations. Background technique [0002] The high-temperature and high-pressure spring safety valve is one of the key valves in the matching valves of thermal power generating units. There are various safety valves. According to the requirements of relevant boiler and pressure vessel safety regulations, large-capacity power plants such as subcritical, supercritical and ultra-supercritical should be equipped with direct-acting full-lift or full-volume spring safety valves; Ultra-high pressure units mostly use pulse-type safety valves according to the supporting habits of former Soviet thermal power units, that is, relying on the small-diameter impulse valve to drive the main safety valve to act after the start. With the maintenance of the unit and the transformation and upgrading of the unit, many origina...

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Problems solved by technology

[0014] In order to overcome the above-mentioned many shortcomings in the existing structure and technology, the present invention proposes a sealing surface with better and more reliable thermal compensation and elastic compensation capabilities, which can improve the sealing reliability of the valve and It can effectively delay the occurrence of the front leakage phenomenon, the elastic deformation gap at the sealing surface is not easy to be blocked, and no steam escapes from the upper end of the back pressure adjustment structure, which can effectively ensure the stable and reliable operation of the spring and help protect the production environment. It can fit better, the spring can effectively dissipate heat, so that the coaxiality of the valve can reach higher precision, the movement of the valve stem is more stable, the valve stem is not easy to be bent or deformed due to stress release, and the nozzle is sealed during maintenance Surface repair and grinding are convenient, the valve stem is not easy to bend and deform during transportation, and there is no problem that the weld of the valve body and nozzle is prone to cracks during use due to the precipitation of Cr elements caused by welding. After the test, the valve does not need to be thermally adjusted after installation, the pressure contact between the valve stem and the valve disc has higher reliability, the processing technology of the valve stem is simplified, the manufacturing quality is easier to guarantee, and the valve is easy to handle on-site when there is a certain leakage High temperature and high pressure spring safety valve structure with thermal compensation and elastic compensation sealing surface

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