Used to prevent the boiler, pressure vessel or piping and other equipment incurred damage due to overpressure valve. When the fluid pressure to protect the body slightly higher than the normal operating pressure to achieve a certain specified value (ie, the valve opening pressure), the safety valve automatically opens, emissions part of the fluid, so that pressure drop. When the pressure drops to a slightly lower than the normal operating pressure of a certain value (that is, the pressure valve back seat), the safety valve closes automatically stop the discharge of fluids and remain sealed.
Safety valve of the valve flap according to the different loading methods are divided into two types of heavy hammer type and spring-loaded (see Figure [safety valve structure]). Hammer-type was divided into direct heavy hammer type and lever-type heavy hammer. Direct heavy hammer-type safety valve is the first use of a safety valve, only a simple low-voltage small-scale equipment (such as domestic pressure cooker), there are still used. Hammer lever-type safety valve structure is simple, load adjustment, reliable, can be used for low-pressure boiler fixed, but great shape, for vibration-sensitive and the use of some disadvantages such as limitations in industry has been rarely used. The most widely used in industry is the spring-loaded safety valve. It can be designed into many kinds of structural patterns in order to meet a variety of application requirements, such as for large displacement, high pressure, high temperature, there is back pressure on the sealing particularly demanding and so on occasions. Figure [safety valve structure] is a very simple structure, a common spring-loaded safety valve. Relief valve is usually by the use of fluid phase behavior were divided into two categories: one category is used for liquids, and import and export of the same size as the opening height of the smaller flap valve; the other is used for steam and gas export size of large on the import of size, valve flap to open a high degree of large, open very quickly. Valve flap valve can be opened by a high degree of emission classification of space conditions.
If the poor performance of safety valve, or the selection, improper installation can cause a serious accident or economic losses. Therefore, we must strictly comply with the relevant standards and safety monitoring body of the laws and regulations. After a good safety valve adjustment should be locked or seals, reckless unauthorized personnel is strictly prohibited. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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