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FORMULA TO GET MEAN SEAT AREA OF SAFETY VALVES

"There are many types of formula which is self generated by BHEL , AND CROSBY but during hauling or setting of the presure in safety valve it doesn't provide any accurate value but I have a great formula to find out mean seat area which is used by professionals "

(((OD - ID)÷2)^2)×π/4

WHERE :-

OD = OUTER DIA OF SEAT

ID = INNER DIA OF SEAT