DIN 3840 E : 1982

1 Field of application<br>2 General comments relating to the use of the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;calculation methods<br>3 Units and symbols<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.1 Units<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.2 Symbols<br>4 Calculation data<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.1 Design pressure<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.2 Test pressure<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.3 Elevated test pressure for type testing of <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;series-manufactured cast iron valves<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4 Temperature used for calculation<br>5 Wall thickness allowances<br>6 Permissible stress<br>7 Calculation of the valve bodies for mainly static <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;internal pressure stressing<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.1 Required wall thickness<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2 Calculation of the valve bodies outside the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;zones of cutaways or branches<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.3 Valve bodies with branch<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.4 Delimitation between the calculation in respect<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of mainly static internal pressure stressing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and the calculation in respect of pulsating <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stressing<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.5 Additional stresses<br>8 Calculation of the body closures for mainly static <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;internal pressure stressing<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.1 Flanges<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.2 Dished heads<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.3 Plate ends<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.4 Flat circular plates and annular plates<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.5 Self-sealing closures<br>Standards referred to and other documents<br>Explanatory notes

Specifies the strength calculation of plain (i.e. not ribbed) valve body components subjected to pressure and made from metallic materials. Within the meaning of this standard, the components discussed here include valve bodies proper and valve body closures and ends such as heads, covers, flanged and special closures. Inserted components subjected to pressure such as gate valve discs and globe valve plugs shall be treated in a similar fashion.