To draw orthographic views (F.V, AND T.V) of safety value and naming the component of safety value.
THEORY:- A safety value is used to limit the maximum pressure of steam in a boiler. It is generally fitted at the croun of a boiler. When the pressure of the steam rises above the specific limit (working pressure) the safety value open automatically to allow the steam to escape. Details of a safety value are shown in fig. the main components are-
(i) C.I body
(ii) Valve.
(iii) Lever.
(iv) Dead weight.
The lower flauge of the body is required to the seating block of the boiler by bolts and in the upper flauge of a bran seat in fitted. The brass value is kept in the position on the seat by a pointed spindle fitted in the steel lever. The shape of the lever is such that its curved end fits against the knife edge of the fukrum and the other end supports the dead weight.
In the normal position, the movement due to dead weight, above the fukurm is more than the movement due to steam pressure. When the pressure exceeds the set limit, the movement due to steam pressure increase 4es and overcomes the movement due to dead weight and the value opens.
PROCEDURE:- first make the outer body with the help of tool box. Then seeing the fig. make rectangles and then by pressing the left mouse button put the components one by one. Arrange them where they are required.
TO LOAD LINE TYPE:- open the layer properties manager dialogue box. Click on the line type name displayed on the row that indicates the properties of a layer. Then select line type, dialogue box will appear. To make a cylindrical shape, firstly make a rectangle and then make them circular at the ends.
COMMANDS USED:-
(i) OSNAP Command.
(ii) Limit command.
(iii) Extend command.
(iv) Mirror command.
(v) Trim command.
(vi) Breach command.