when the pipe or equipment within the medium pressure relief valve than specified value, the open-close part ( The disc) Open automatically discharge medium; Below the specified value, the open-close part ( The disc) Automatically shut down. To the protective pipe or equipment is called safety valve of the valve. The relief valve is often as a last line protection device, thus the reliability of equipment and personal safety is of great significance.

( 1) The development trend of safety valve relief valve technology development has experienced a long process of more than 300 years. From smaller raise development to full and type of large displacement, a heavier hammer ( Static weighing type) Development to the lever and weight style spring type, appeared again after direct acting type indirect role in guiding type, etc. The technology development trend in general has the following characteristics.

(1) standardization and seriation this characteristic mainly reflects in process industries such as petroleum, chemical industry and general industrial safety valve used in the boiler. This kind of performance of the relief valve without big changes over the years, and its basic parameters has standardization, seriation. This is mainly embodied in the port area and the opening two aspects.

。 Port area. Table 2 - ANSIB146 2 is the U. S. national standards. 1 'steel flange connection safety relief valve' regulation of the relief Industrial Valves flow area of the standard series, valve in strict accordance with the standard to produce the relief valve. In addition to the United States, Japan, Western Europe and many other countries are widely used in the above standard series. Table 2 - 3 is the former Soviet union standard TOCT12532 direct acting safety valve types and basic parameters specified port area of standard series.

b。 The opening height. The former Soviet union standard [ OCT12532 open height is divided into the following three according to the safety Industrial Valves.

tiny qi type: open height of runner diameter of 1/40 ~ 1/20; The type of zhongqi: open height is greater than 1/20 ~ 1/4 runner diameter; All rev type: open height is greater than 1/4 runner diameter.

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