Japanese industrial standard JISB8210 the steam and gas spring safety valve in accordance with the 1978 version of open highly different divides into the relief valve low uplift programs, young programs, all programs, and total quantity type four, while 1986 version to merge the first three for one, namely into the following two ( H for open height, D for the sealing surface diameter, d0 runner diameter) 。 Total quantity type: D≥ 1. 15d0。 Yang program: disc after open between the sealing surface fluid channel area is greater than or equal to port area 1. 5 times, inlet channel area is greater than or equal to port area 1. Seven times. Japanese standards of these changes, shows the opening as a safety valve basic parameters in down trends. There are many countries in the standard made provisions for the size of the opening height, this is because the size of the opening height mainly reflect the size of the displacement coefficient, the displacement coefficient as an important performance parameters of the relief valve has made specific provision in the relevant standards. The Industrial Valves with the improvement of the capacity test means, get approved by the inspection authority to the measured displacement coefficient as the basis of using the relief valve has become a common international practices. In this way, open height as the basic parameters of the relief valve is greatly reduced. Relief valve in the standard in our country, not the regulations on port area and port diameter, in the GB/T12243 - 2005 standard for direct load safety valve spring, made provisions for the relief valve opening: all rev safety valve is greater than or equal to the port of the diameter of the quarter; Raise safety valve for the runner diameter of 1/40 ~ 1/20; The rev type 1/20 ~ 1/4 of the runner diameter.

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