Assembly Drawings 321
dharm
d:\N-Design\Des18-3.pm5
R12
2HOLES, DIA12
15
SQ20
M20
32
45
10
120
f^12
24
R12^6
24
15
46
f 10
60°
14
10
(^2632)
4
f 20
f^3 f^12
2
f 40 12
124
24
R12 2 HOLES,
DIA 12
3
THICK 6
6
7
20
11
f^60
20
f^3
8
10
6
f1
0
R25
R12
15
175
6
Fig. 18.38 Ramsbottom safety valve
assembly by fixing the spring 6 between the eye bolt and the lever (holes are provided in the lever
and eye bolt for this purpose). When the set value of the pressure exceeds in the boiler, the lever
moves and allows the valves to get lifted from the seats concerned. The movement of the lever is
permitted due to the slot provided centrally in it and returns to the original position due to spring
action. Figure 19.19 shows the assembled views of the Ramsbottom safety valve.
Exercise
Assemble the parts of the Ramsbottom safety valve, shown in Fig. 18.38 and draw, (i) sectional
view from the front and (ii) sectional left side view.
18.5 Miscellaneous Parts
18.5.1 Socket and Spigot Joint
This joint is used to connect two circular rods and subjected to axial loads. For this purpose, the
ends of the rods are shaped suitably to form a socket at one end while the other rod end as a spigot
and slots are made.
Figure 18.39 shows the details of a socket and spigot joint. The spigot end of the rod 2 is
inserted into the socket end of the rod 1. After aligning the socket and spigot ends, the cotter 3 is
driven-in, forming the joint. Figure 6.13 shows the assembly drawing of the socket and spigot
joint.
